Patent Application
20200331683
The present invention relates to a package, in particular for containing products, for example of a food type. The invention also relates to a process and a relative apparatus for manufacturing said package using a support or tray designed to house at least one product, and at least one plastic film, designed to mate with the support or tray in order to seal the product in a package. The finding can have application in vacuum packaging or in controlled atmosphere packaging of products of various type.
In the food packaging field, in particular, packages are known, closed by means of plastic films provided with a facilitated opening system which facilitates the opening of the package by the user, thus ensuring a simple and rapid extraction of the product from the package. A first example of facilitated opening described in patent application no. WO 2008/029332 A1, provides a first and a second plastic film coupled together at an outer perimetral edge so as to define a housing compartment for one or more products interposed between the first and the second film. The package has a facilitated opening system consisting of two flaps flanked to each other, not overlapping each other, respectively of the first and second plastic films which emerge from the perimetral closing edge of the package. The flaps are configured for defining respective gripping portions adapted to allow the opening of the package.
Although the opening system of the aforementioned international application represents a facilitated access point for the package, the Applicant has noted that the package is not however without drawbacks. In particular, it is noted that due to the flexible structure of the package and in particular the structure of the facilitated opening system, the same package is difficult to grip and above all complex to handle during the opening steps thereof.
A second example of a facilitated opening package, described in the French patent application no. FR 3 002 209 A1, provides a tray having a substantially rectangular shape and a plastic film welded at a perimetral edge of the tray. The tray comprises a gripping portion emerging from one side of the perimetral edge; in turn, the film comprises a closing portion welded to said perimetral edge and a respective gripping portion emerging from the latter.
A first part of the gripping portion of the film is superimposed to the gripping portion of the support and is configured for being raised relative to the latter while a second part of the gripping portion of the film is flanked by the gripping portion of the support and emerges from the perimetral edge of the latter. The second part of the film is attached to a stiffening tab of the tray: the second part of the film together with the stiffening tab represent the part of film which can be grasped by the user for opening the package, while the gripping portion of the tray, on the other hand, is the part which can be grasped by the user for holding the support during the step of removing the film from the package.
While the solution described in the French application allows defining a package with a facilitated opening, the Applicant has noted that the structure of the opening system of the French application requires the use of an excessive amount of material to define, on the one hand, the gripping portion of the tray and, on the other hand, the second part of the film constrained to the stiffening tab. The structure of the opening system negatively affects both in terms of production costs and overall dimensions of the package, which is therefore excessively cumbersome.
The object of the present invention is to solve the drawbacks and/or limitations of the above prior art.
A first object of the invention is to provide a package having an effective facilitated opening system to allow the user a simple and quick opening of the package; in particular, it is an object of the present invention to provide a package that provides the user with a rapid tactile and visual perception of the facilitated opening system. A further object of the present invention is to provide a package having a simple and cost-effective structure which at the same time can ensure a convenient and stable handling of the package at least during the opening of the latter. A further object is to provide a package that can be manufactured by means of a simple and fast in-line production, which does not require expensive modifications to the manufacturing plants of standard packages, i.e. without a facilitated opening system.
These and yet other objects, which will become more apparent from the following description, are substantially achieved by a package, an apparatus and a related process for manufacturing said package according to what is expressed in one or more of the accompanying claims and/or the following aspects, taken alone or in any combination with each other or in combination with any one of the appended claims and/or in combination with any of the other aspects or features described below.
In a 1st aspect, a package (100) is provided for containing at least one product (P) comprising:
the removable portion (21) and at least part of the closing film (10) being configured for being separated from the support (1) during an opening step of the package (100), the package (100) being configured for defining a closed condition in which:
and wherein:
In a 2nd aspect according to the 1st aspect, the gripping portion (22), at least in the closed condition of the package, is interposed between the removable portion (21) and the perimetral edge (6).
In a 3rd aspect according to any one of the preceding aspects, the gripping portion (22), at least in the closed condition of the package, is interposed between the removable portion (21) and the portion (6a) of the perimetral edge (6) from which said removable portion extends as a prolongation.
In a 4th aspect according to any one of the preceding aspects, the gripping portion (22) is directly constrained only to the perimetral edge (6) of the support, optionally the gripping portion (22) is not directly constrained to the closing film (10).
In a 5th aspect according to any one of the preceding aspects, the gripping portion (22), in the closed condition of the package, has an upper surface which is:
In a 6th aspect according to any one of the preceding aspects, the closing film (10) is of a plastic material, the closing film being heat-sealed only to the perimetral edge (6) of the support (1) and to the removable portion (21), the closing film (10) being not heat-sealed to said gripping portion (22).
In a 7th aspect according to any one of the preceding aspects, the gripping portion (22) comprises:
wherein the coating layer (22b) is configured for preventing the bond, optionally the sealing, of the gripping portion itself to the closing film (10).
In an 8th aspect according to the preceding aspect, the coating layer (22b) is made of a not heat-sealable material.
In a 9th aspect according to any one of the preceding aspects, the removable portion (21), in the closed condition, is coplanar with at least said portion (6a) of the perimetral edge (6) from which the removable portion (21) itself extends as a prolongation.
In a 10th aspect according to any one of the preceding aspects, the gripping portion (22) is integrally joined to the perimetral edge (6) of the support (1).
In an 11th aspect according to any one of the preceding aspects, the gripping portion (22) extends as a prolongation of the perimetral edge (6) away from the base (2).
In a 12th aspect according to any one of the preceding aspects, the gripping portion (22) extends as a prolongation of the same portion (6a) of the perimetral edge (6) from which, in the closed condition of the package, the removable portion (21) extends as a prolongation.
In a 13th aspect according to any one of the preceding aspects, the gripping portion (22) is coplanar to at least said portion (6a) of the perimetral edge (6).
In a 14th aspect according to any one of the preceding aspects, the gripping portion (22) is coplanar to the removable portion (21) at least in the closed condition of the package (100).
In a 15th aspect according to any one of the preceding aspects, the gripping portion (22) is directly engaged with the perimetral edge (6).
In a 16th aspect according to any one of the preceding aspects, the gripping portion (22) is directly engaged with the at least said portion (6a) of the perimetral edge (6).
In a 17th aspect according to any one of the preceding aspects, the perimetral edge (6) comprises an external flange (30) which lies on a plane, wherein the closing film (10) being engaged with the flange (30).
In an 18th aspect according to the preceding aspect, the gripping portion (22) extending at least partly along a respective plane parallel to the lying plane of the flange (30).
In a 19th aspect according to the 17th or 18th aspect, the gripping portion (22) is at least partly coplanar with the flange (30) of the perimetral edge (6).
In a 20th aspect according to any one of the aspects from the 17th to the 19th, the removable portion (21), in the closed condition of the package, extends along a main direction coplanar to the lying plane of the flange (30).
In a 21st aspect according to any one of the preceding aspects, the gripping portion (22) comprises a tab emerging from the perimetral edge (6).
In a 22nd aspect according to the preceding aspect, the removable portion (21) comprises a flat tab which, at least in the closed condition of the package, is coplanar with the flat tab of the gripping portion (22).
In a 23rd aspect according to any one of the aspects from the 7th to the 22nd, the support portion (22a) of the gripping portion (22) is integrally joined to the perimetral edge (6).
In a 24th aspect according to any one of the aspects from the 17th to the 23rd, the support portion (22a) of the gripping portion (22) is integrally joined to the flange (30) of the perimetral edge (6).
In a 25th aspect according to any one of the aspects from the 7th to the 24th, the coating layer (22b) is directly constrained only to the support portion (22a) of the gripping portion (22) itself.
In a 26th aspect according to any one of the aspects from the 7th to the 25th, the coating layer (22b) is integrally joined to the support portion (22a) of the same gripping portion (22).
In a 27th aspect according to any one of the preceding aspects, the package (100) is configured for defining a pre-opening condition in which:
wherein in the pre-opening condition of the package, the closing film (10) is distanced from the gripping portion (22) so that such gripping portion is grippable by an user.
In a 28th aspect according to any one of the preceding aspects, the removable portion (21), in the closed condition of the package, is:
In a 29th aspect according to any one of the preceding aspects, the removable portion (21) has a mechanical stiffness greater than a mechanical stiffness of the closing film (10).
In a 30th aspect according to any one of the preceding aspects, the removable portion (21) has a mechanical stiffness substantially equal to a mechanical stiffness of the perimetral edge (6) of the support (1).
In a 31st aspect according to any one of the preceding aspects, the removable portion (21) has a thickness greater than a thickness of the closing film (10), optionally the removable portion (21) has a thickness of at least 1.5 times, in particular 3 times, greater than a thickness of the closing film (10).
In a 32nd aspect according to any one of the preceding aspects, the base (2) of the support (1) comprises a bottom wall (8) and a lateral wall (7), said lateral wall (7) emerging, in height, from the bottom wall (8) transversally to this latter, and defining, cooperatively with said bottom wall (8), a containment seat intended to receive the product (P),
wherein the flange (30) of the perimetral edge (6) emerges from the lateral wall (7) according to a direction exiting from the containment seat, said flange (30) being distanced from the bottom wall (8),
wherein the gripping portion (22) is borne by, optionally integrally joined to, the flange (30) and emerges from this latter away from the lateral wall (7).
In a 33rd aspect according to any one of the preceding aspects, the support (1) comprises at least one angular portion (11), the removable portion (21) being disposed at the at least one the angular portion (11), optionally the removable portion (21) defines at least part of said angular portion (11).
In a 34th aspect according to the preceding aspect, the gripping portion (22) is arranged at said at least one angular portion (11).
In a 35th aspect according to the 33rd or 34th aspect, the gripping portion (22) and the removable portion (21) are arranged at a same angular portion (11) of the support (1).
In a 36th aspect according to any one of the preceding aspects, the support (1) comprises a plurality of angular portions (11), wherein the removable portion (21) defines at least part of only one of said angular portions (11), wherein the gripping portion (22) is arranged at said angular portion defined at least in part by said removable portion (21).
In a 37th aspect according to any one of the preceding aspects, the removable portion (21) comprises a tab having a substantially “L” or “C” or “U” or “V” shape defining said cavity (21a) the concavity whereof faces the base (2) of the support (1).
In a 38th aspect according to any one of the preceding aspects, the gripping portion (22) is entirely contained within the cavity of said removable portion (21).
In a 39th aspect according to any one of the preceding aspects, the gripping portion (22) is at least partially, optionally entirely, counter-shaped to the cavity (21a) of the removable portion (21).
In a 40th aspect according to any one of the preceding aspects, the package comprises at least one product (P), optionally of a food-type, arranged in the housing compartment (5), wherein the closing film (10) is tight-fluidly engaged to the perimetral edge (6) of the support (1), optionally engaged to the flange (30), so that the housing compartment (5) is fluid-tight.
In a 41st aspect according to any one of the preceding aspects, wherein:
In a 42nd aspect according to any one of the preceding aspects, the support (1) is entirely made of plastic material, optionally obtained by means of a thermoforming process.
In a 43rd aspect according to any one of the preceding aspects, the gripping portion (22) is entirely made of plastic material.
In a 44th aspect according to any one of the aspects from the 7th to the 42nd, the coating portion (22b) of the gripping portion (22) is made of at least one selected from the group of the following materials:
In a 45th aspect according to any one of the preceding aspects, wherein the gripping portion (22) comprises a folded portion of the support (1) itself.
In a 46th aspect according to any one of the preceding aspects, the support extends in thickness between:
wherein at least the perimetral edge (6) and the removable portion (21) are defined superficially by said first surface of heat-sealable material,
wherein the gripping portion (22) comprises a portion of the support folded above the perimetral edge (6) so that the gripping portion itself (22) is externally defined by the second not heat-sealable surface.
In a 47th aspect according to the preceding aspect, wherein the gripping portion (2) is entirely defined externally by said second surface of a not heat-sealable material.
In a 48th aspect according to the 46th or 47th aspect, the second surface of a not heat-sealable material seamlessly extends starting from a lower side of the support to an upper side opposed to the lower side and adapted to receive the closing film.
In a 49th aspect according to any one of the preceding aspects, at least a part of the second not heat-sealable surface of the folded gripping portion (22) faces towards a same side from the first surface of heat-sealable material defining at least part of the perimetral edge (6).
In a 50th aspect, a process is provided for manufacturing a package (100) for containing at least one product (P) according to any one of the preceding aspects.
In a 51st aspect according to the preceding aspect, the process comprising at least the following steps:
In a 52nd aspect according to the preceding aspect, the process further comprises at least one step of making at least one through cut in the sheet material (200) and in the closing film (201), such through cut, cooperatively with the notch made on the sheet material (200), delimits the removable portion (21) to define said package (100).
In a 53rd aspect according to the preceding aspect, the through cut intersects—in at least one point—the at least one notch in the sheet material (200) in order to delimit at least partially said removable portion (21).
In a 54th aspect according to any one of the aspects from the 51st to the 53rd, the step of constraining the closing film (201) comprises a step of heat-sealing said film on the sheet material (200).
In a 55th aspect according to any one of the aspects from the 51st to the 53rd wherein, prior to the constraining step of the film, the process comprises a step of defining a layer on an upper surface of the second semifinished portion (222) of a material not heat-sealable with the closing film (201), said upper surface, following the constraining step of the closing film (201) on the support (1), being facing said closing film.
In a 56th aspect according to the preceding aspect, wherein said step of defining a layer of a material not heat-sealable with the closing film (201) comprises a sub-step of applying, for example by means of a printing action, a coating layer (22b) of a not heat-sealable material on the sheet material (200).
In a 57th aspect according to the preceding aspect, said step of applying the coating layer (22b) may be carried out:
In a 58th aspect according to the 55th aspect, wherein the sheet material (200) is defined in thickness between a first surface of a heat-sealable material and a second surface of a material not heat-sealable with the closing film (201),
said step of defining a layer of a material not heat-sealable with the closing film (201) comprises a sub-step of folding a first part of the semifinished portion (222) above a second part such that a part of the second surface of a not heat-sealable material is, in the bonding step of the closing film (201), facing the latter.
In a 59th aspect according to the 55th or 58th aspect, wherein the step of defining a layer of a material not heat-sealable with the closing film (201) comprises a sub-step of folding a portion of the support such that a surface of a not heat-sealable material is facing towards a same side of the support comprising a surface of heat-sealable material adapted to receive the closing film in engagement.
In a 60th aspect according to any one of the aspects from the 52nd to the 59th, the step of through cut of the sheet (200) and of the closing film (201) is subsequent to the step of constraining said closing film (201) to the sheet material (200).
In a 61st aspect according to any one of the aspects from the 51st to the 60th, the process comprises:
In a 62nd aspect according to any one of the aspects from the 51st to the 61st, the step of making a notch and defining on an upper surface of the second semifinished portion (222) a layer of material not heat-sealable with the closing film (201) are combined in one step.
In a 63rd aspect according to any one of the aspects from the 51st to the 62nd, the process comprises a step of thermoforming the sheet material (200) for defining a precursor body comprising a plurality of semifinished supports (1c), each semifinished support (1c) comprising:
wherein the step of making a notch in the sheet material (200) provides to make at least one through cut on the perimetral edge (6) of each semifinished support (1c) for defining a first and second semifinished portions flanked to each other.
In a 64th aspect according to the preceding aspect, the layer of a material not heat-sealable with the closing film (201) is defined on the perimetral edge (6) of each semifinished support (1c).
In a 65th aspect according to the preceding aspect, the step of constraining the closing film (201) to at least one portion of the sheet material (200) comprises a step of fluid-tightly heat-sealing said film to the perimetral edge (6) of each semifinished support (1c) of the precursor body, each semifinished support (1c), cooperatively with the closing film, defining a housing compartment (5) for at least one product (P).
In a 66th aspect according to any one of the aspects from the 51st to the 65th, the step of positioning the product (P) on the sheet material (200) comprises resting at least one product (P) on the base (2) of the semifinished support (1c) of the precursor body.
In a 67th aspect according to any one of the aspects from the 51st to the 65th, the process comprises a step of making a through cut in the precursor body, on which the plurality of semifinished supports (1c) are defined, and in the closing film (201) associated to the precursor body for defining, at the end of the step of making the through cut, a plurality of single packages (1) according to any one of the aspects from the 1st to the 49th.
In a 68th aspect, an apparatus (300) is provided for making a package (100) according to any one of the aspects from the 1st to the 49th, the apparatus (300) being configured for performing the process according to any one of the aspects from the 50th to the 67th.
In a 69th aspect according to the preceding aspect, the apparatus (300) comprises:
In a 70th aspect according to the 68th or 69th aspect, the apparatus comprises a printing station (305) placed upstream of the packaging station (307) with respect to the advancement path (A) of the sheet material (200) configured for applying on the sheet material, optionally on the second semifinished portion (222), a coating layer (22b) of a material not heat-sealable with the closing film (201), optionally for defining said gripping portion (22) comprising a layer not heat-sealable with the closing film (10).
In a 71st aspect according to the 68th or 69th aspect, the apparatus comprises at least one folding station (330) placed upstream the packaging station (307) with respect to the advancement path (A) of the sheet material (200) and which is configured for folding, with respect to the sheet material, the second semifinished portion (222) for defining the gripping portion (22).
In a 72nd aspect according to the preceding aspect, wherein the folding station is interposed between the notching station (306) and the packaging station (307).
In a 73rd aspect according to the 71st aspect, wherein the folding station (330) and the notching station (306) are integrated to define a single station.
In a 74th aspect according to the 71st or the 73rd aspect, wherein the notching station (306) and the folding station (330) are configured for acting substantially simultaneously on the sheet material (200) for defining said gripping portion (22).
In a 75th aspect according to any one of the aspects from the 71st to the 74th, the folding station (330) comprises at least one pusher (331) configured for moving relative to the sheet material (200) at least between:
In a 76th aspect according to the preceding aspect, the pusher (331), in the retracted position, is configured for being spaced from the sheet material (200), optionally spaced from the second semifinished portion (222), even more optionally spaced from the second not heat sealable surface of the second semifinished portion (222).
In a 77th aspect according to the 75th or 76th aspect, the folding station (330) further comprises a pressure member (332) configured for disposing itself, optionally at least in the retracted position of the pusher (331), opposed to the pusher (331) with respect to the sheet material (200),
wherein said pressure member (332) is configured for contacting the second semifinished portion (222), raised by the pusher (331), to fold it above a portion of a perimetral edge of the sheet material so as to define said gripping portion (22).
In a 78th aspect according to the preceding aspect, wherein the pressure member (332) is configured for contacting the second semifinished portion (222), raised by the pusher, at the second not heat-sealable surface.
In a 79th aspect according to the 77th or 78th aspect, the pressure member (332) is configured for moving, in conditions of use of the apparatus, relative to the sheet material (200) at least between:
In an 80th aspect according to any one of the aspects from the 75th to the 79th, the folding station (330) comprises a first actuator (331a) active in control on the pusher (331) and configured for moving the latter from the retracted position to the advanced position, and vice versa.
In an 81st aspect according to the 79th or 80th aspect, the folding station (330) comprises a second actuator (332a) active in control on the pressure member (332) and configured for moving the latter from the starting position to the crushing position, and vice versa.
In an 82nd aspect according to the preceding aspect, the apparatus comprises a control unit (311) connected to said first and second actuators (331a, 332a) and configured for:
In an 83rd aspect according to the preceding aspect, the control unit (311) is configured for commanding the advanced position of the pusher (331) and at the same time to command the starting position of the pressure member (332),
wherein the control unit (311), only after having commanded the advanced position of the pusher (331), is configured for commanding the retracted position of the latter, the control unit (311) is configured for commanding the crushing position of the pressure member (332) when the pusher (331) is in the retracted position.
In an 84th aspect according to any one of the aspects from the 75th to the 83rd, the folding station (330) comprises a counter-thrust tool (333) configured for disposing itself against the pusher (331) with respect to the sheet material (200), said counter-thrust tool (333) being configured for leaning against an edge portion of the sheet material (200) placed adjacent to the second semifinished portion (222) for keeping said sheet material (200) in a predetermined position at least during the passage of the pusher (331) from the retracted position to the advanced position.
In an 85th aspect according to the preceding aspect, the counter-thrust tool (333) is configured for moving relative to the sheet material (200) at least between:
wherein the pusher (331) is configured for moving from the retracted position to the advanced position during the abutment position of the counter-thrust tool (333).
In an 86th aspect according to the preceding aspect, wherein the pressure member (332) is configured for moving from the starting position to the crushing position during the distanced position of the counter-thrust tool (333).
In an 87th aspect according to the preceding aspect, wherein the counter-thrust tool (333) is configured for disposing itself on the same side of the sheet material (200) on which the pressure member (332) is disposed, optionally opposed to the pusher (331).
In an 88th aspect according to any one of the aspects from the 84th to the 87th, the folding station comprises a third actuator (333a) active in command on the counter-thrust tool (333) and configured for commanding the distanced and the abutment position.
In an 89th aspect according to the preceding aspect, the control unit (311) of the apparatus is connected to said third actuator (333a) and configured for commanding said distanced and abutment position of the counter-thrust tool (333) to said third actuator (333a).
In a 90th aspect according to the preceding aspect, the control unit (311) is configured for synchronizing the actuation of said third actuator with the actuation of said first and second actuators (331a, 332a) to allow the pusher (331) to raise the second semifinished portion and, only subsequently, allow the pressure member to crush said raised second semifinished portion for defining said gripping portion.
In a 91st aspect according to the preceding aspect, wherein the control unit (311), only after having commanded the abutment position of the counter-thrust tool (333), is configured for commanding the advancement position of the pusher (331).
In a 92nd aspect according to the 90th or 91th aspect, wherein the control unit (311), only after having commanded the distanced position of the pusher (331), is configured for commanding the crushing position of the pressure member (332).
In a 93rd aspect according to any one of the aspects from the 71st to the 92nd, the folding station (330) and the notching station (306) are integrated to define a single station.
In a 94th aspect according to the preceding aspect, the notching station (306) comprises a blade (306a) configured for moving relative to the sheet material (200) at least between:
In a 95th aspect according to the preceding aspect, the blade (306a) is engaged with the pusher (331) and configured for moving move, optionally by translation, relative to the latter.
In a 96th aspect according to the preceding aspect, wherein the blade (306a) defines a cavity inside which the pusher (331) is engaged by sliding.
In a 97th aspect according to the 93th or 94th aspect, the blade (306a) is configured for being placed in opposition to the pusher (331) and to the counter-thrust tool (333) with respect to the sheet material (200), said blade (306a) is configured for moving towards and away from the pusher (331).
In a 98th aspect according to the preceding aspect, wherein the blade (306a) is adjacent to the pressure member (332).
In a 99th aspect according to any one of the aspects from the 71st to the 98th, the apparatus comprises a plurality of folding stations (330) aligned along a transversal direction, optionally orthogonal, to the advancement path (A) of the sheet material (200).
In a 100th aspect according to any one of the aspects from the 68th to the 99th, the apparatus comprises at least one cutting station (310) placed downstream of the notching station (306), optionally downstream of the folding station, configured for defining a through cut of the sheet material (200) and closing film (201) for forming said packages (100).
In a 101st aspect according to any one of the aspects from the 68th to the 100th, the packaging station (307) is synchronized with at least one of the conveyor (302), the first supplying group (301) or the second supplying group (303).
In a 102nd aspect according to any one of the aspects from the 68th to the 101st, the apparatus comprises a positioning station (304) configured for housing at least one product (P) on the sheet material (200) upstream of the packaging station (307).
In a 103rd aspect according to the preceding aspect, said positioning station (304) configured for housing, upstream of the packaging station (307), at least one product (P) on at least one base (2) of the supports (1) defined on the sheet material (200).
In a 104th aspect according to any one of the aspects from the 68th to the 103rd, the apparatus comprises a forming station (308) configured for making the supports (1), by means of a thermoforming process, on the sheet material, said forming station being arranged upstream of the packaging station (307).
In a 105th aspect according to the preceding aspect, the forming station (308) is configured for performing a thermoforming of the sheet material (200) to define on the latter one or more semifinished supports (1c).
In a 106th aspect according to the preceding aspect, wherein the folding station (330) is configured for folding the second semifinished portion (222) of each semifinished support (1c).
In a 107th aspect according to the 105th or 106th aspect, wherein the forming station is configured for defining one or more rows of semifinished supports (1c) extending along the advancement path (A) of the sheet material,
wherein the apparatus comprises a folding station (330), optionally a cutting station (306), for each row of semifinished supports (1c).
In a 108th aspect, a support (1) for packages (100) is provided for the containment of products (P), said support (1) being of the type according to any one of the aspects from the 1st to the 49th, optionally obtained through the process according to any one of the aspects from the 50th to the 67th.
In a 109th aspect, a support (1) is provided comprising:
at least part of the removable portion (21) and of the perimetral edge (6) being configured for receiving in engagement a closing film (10) of the support (1),
wherein the removable portion (21) is configured for being separated from the support (optionally from the rest of the support or base and movable portion) during a package (100) opening step.
In a 110th aspect according to the preceding aspect, the removable portion (21) has a cavity (21a) the concavity whereof (at least when the gripping portion is not separated from the rest of the support) faces the perimetral edge (6).
In a 111th aspect according to the 109th or 110th aspect, the support comprises a gripping portion (22) disposed within the cavity (21a) of the removable portion (21).
In a 112th aspect according to the preceding aspect, the gripping portion (22) emerging from the perimetral edge (6).
In a 113th aspect according to the 111th or 112th aspect, the gripping portion (22) is interposed between the removable portion (21) and the perimetral edge (6).
In a 114th aspect according to any one of the preceding aspects from the 111th to the 113th, the gripping portion (22) is interposed between the removable portion (21) and the portion (6a) of the perimetral edge (6) from which said removable portion extends as a prolongation.
In a 115th aspect according to any one of the aspects from the 111th to the 114th, the gripping portion (22) is only directly connected to the perimetral edge (6) of the support.
In a 116th aspect according to any one of the aspects from the 111th to the 115th, the gripping portion (22) comprises:
In a 117th aspect according to the preceding aspect, the coating layer (22b) is made of a not heat-sealable material.
In a 118th aspect according to any one of the aspects from the 109th to the 117th, the removable portion (21) is coplanar to the perimetral edge (6) from which the removable portion (21) itself extends as a prolongation.
In a 119th aspect according to any one of the aspects from the 111th to the 118th, the gripping portion (22) is integrally joined to the perimetral edge (6) of the support (1).
In a 120th aspect according to any one of the aspects from the 111th to the 119th, the gripping portion (22) extends as a prolongation of the perimetral edge (6) away from the base (2).
In a 121st aspect according to any one of the aspects from the 111th to the 120th, the gripping portion (22) extends as a prolongation of the same portion (6a) of the perimetral edge (6) from which the removable portion (21) extends as a prolongation.
In a 122nd aspect according to any one of the aspects from the 111th to the 121st, the gripping portion (22) is coplanar to at least said portion (6a) of the perimetral edge (6).
In a 123rd aspect according to any one of the aspects from, the 111th to the 122nd, the gripping portion (22) is coplanar to the removable portion (21).
In a 124th aspect according to any one of the aspects from the 111th to the 123rd, the gripping portion (22) is directly engaged with the perimetral edge (6).
In a 125th aspect according to any one of the aspects from the 111th to the 124th, the gripping portion (22) is directly engaged with at least said portion (6a) of the perimetral edge (6).
In a 126th aspect according to any one of the preceding aspects, the perimetral edge (6) comprises an external flange (30) which lies on a plane.
In an 127th aspect according to the preceding aspect, the gripping portion (22) extending at least partly along a respective plane parallel to the lying plane of the flange (30).
In a 128th aspect according to the 126th or 127th aspect, the gripping portion (22) is at least partly coplanar with the flange (30) of the perimetral edge (6).
In a 129th aspect according to any one of the aspects from the 126th to the 128th, the removable portion (21) extends along a main direction coplanar to the lying plane of the flange (30).
In a 130th aspect according to any one of the preceding aspects, the gripping portion (22) comprises a tab emerging from the perimetral edge (6).
In a 131st aspect according to the preceding aspect, the removable portion (21) comprises a flat tab which is coplanar with the flat tab of the gripping portion (22).
In a 132nd aspect according to any one of the aspects from the 116th to the 131st, the support portion (22a) of the gripping portion (22) is integrally joined to the perimetral edge (6).
In a 133rd aspect according to any one of the aspects from the 126th to the 132nd, the support portion (22a) of the gripping portion (22) is integrally joined to the flange (30) of the perimetral edge (6).
In a 134th aspect according to any one of the aspects from the 111th to the 133rd, the coating layer (22b) is directly constrained only to the support portion (22a) of the gripping portion (22) itself.
In a 135th aspect according to any one of the aspects from the 116th to the 134th, the coating layer (22b) is integrally joined to the support portion (22a) of the same gripping portion (22).
In a 136th aspect according to any one of the preceding aspects, the removable portion (21) is integrally joined to the perimetral edge (6) of the support (1) by at least one weakening portion (25) of the support (1), said weakening portion (25) being configured for ensuring the separation of the removable portion (21) itself from the perimetral edge (6) of the support (1) during a step of opening the package (100) following the closed condition.
In a 137th aspect according to any one of the preceding aspects, the removable portion (21) has a mechanical stiffness greater than a mechanical stiffness of the closing film (10).
In a 138th aspect according to any one of the preceding aspects, the removable portion (21) has a mechanical stiffness substantially equal to a mechanical stiffness of the perimetral edge (6) of the support (1).
In a 139th aspect according to any one of the preceding aspects, the base (2) of the support (1) comprises a bottom wall (8) and a lateral wall (7), said lateral wall (7) emerging, in height, from the bottom wall (8) transversally to this latter, and defining, cooperatively with said bottom wall (8), a containment seat intended to receive the product (P).
In a 140th aspect according to the preceding aspect, the flange (30) of the perimetral edge (6) emerges from the lateral wall (7) according to a direction exiting from the containment seat, said flange (30) being distanced from the bottom wall (8).
In a 141st aspect according to the preceding aspect, the gripping portion (22) is borne by, optionally integrally joined to, the flange (30) and emerges from this latter away from the lateral wall (7).
In a 142nd aspect according to any one of the preceding aspects, the support (1) comprises at least one angular portion (11), the removable portion (21) being disposed at the at least one the angular portion (11), optionally the removable portion (21) defines at least part of said angular portion (11).
In a 143rd aspect according to the preceding aspect, the gripping portion (22) is arranged at said at least one angular portion (11).
In a 144th aspect according to the 142nd or 143rd aspect, the gripping portion (22) and the removable portion (21) are arranged at a same angular portion (11) of the support (1).
In a 145th aspect according to any one of the preceding aspects, the support (1) comprises a plurality of angular portions (11), wherein the removable portion (21) defines at least part of only one of said angular portions (11), wherein the gripping portion (22) is arranged at said angular portion defined at least in part by said removable portion (21).
In a 146th aspect according to any one of the preceding aspects, the removable portion (21) comprises a tab having a substantially “L” or “C” or “U” or “V” shape defining said cavity (21a) the concavity whereof faces the base (2) of the support (1).
In a 147th aspect according to any one of the preceding aspects, the gripping portion (22) is entirely contained within the cavity of said removable portion (21).
In a 148th aspect according to any one of the preceding aspects, the gripping portion (22) is at least partially, optionally entirely, counter-shaped to the cavity (21a) of the removable portion (21).
In a 149th aspect according to any one of the preceding aspects, the support (1) is entirely made of plastic material, optionally obtained by means of a thermoforming process.
In a 150th aspect according to any one of the preceding aspects, the gripping portion (22) is entirely made of plastic material.
In a 151st aspect according to any one of the aspects from the 116th to the 150th, the coating portion (22b) of the gripping portion (22) is made of at least one selected from the group of the following materials:
In a 152nd aspect according to any one of the preceding aspects, wherein the gripping portion (22) comprises a folded portion of the support (1) itself.
In a 153rd aspect according to any one of the preceding aspects, the gripping portion extends in thickness between a first surface of a heat-sealable material, and a second surface of a material not heat-sealable with the closing film (10), wherein at least the perimetral edge (6) and removable portion (21) are superficially defined by said first upper surface of heat-sealable material,
wherein the gripping portion (22) comprises a portion of the support folded above the perimetral edge (6) so that the gripping portion itself (22) is externally defined by the second not heat-sealable surface.
In a 154th aspect according to the preceding aspect, wherein the gripping portion (2) is entirely defined externally by said second surface of a not heat-sealable material.
In a 155th aspect according to the 153rd or 154th aspect, the second surface of a not heat-sealable material extends without interruption starting from a lower side of the support to an upper side opposed to the lower side and adapted to receive the closing film.
In a 156th aspect according to any one of the preceding aspects, at least a part of the second not heat-sealable surface of the folded gripping portion (22) faces towards a same side from the first surface of heat-sealable material defining at least part of the perimetral edge (6).
In a 157th aspect, a support is provided, usable in a package according to any one of the aspects from the 1st to the 49th.
In a 158th aspect, a package is provided comprising the features of the support described in any one of the aspects from the 1st to the 49th of package.
In a 159th aspect, a use of a support for making packages, for example for containing food products, is provided.
In a 160th aspect, a process for manufacturing a support according to any one of the preceding aspects is provided.
In a 161st aspect according to the preceding aspect, the process comprising at least the following steps:
In a 162nd aspect according to the preceding aspect, the process comprises a step of defining on a second surface of the second semifinished portion (222) a layer of a material not heat-sealable with a closing film (201) of the support.
In a 163rd aspect according to the preceding aspect, wherein said step of defining a layer of a material not heat-sealable with the closing film (201) comprises a sub-step of applying, for example by means of a printing action, a coating layer (22b) of a not heat-sealable material on the sheet material (200).
In a 164th aspect according to the preceding aspect, said step of applying the coating layer (22b) may be carried out:
In a 165th aspect according to the 162nd aspect, wherein the sheet material (200) is defined in thickness between an upper surface of a heat-sealable material and a lower surface of a material not heat-sealable with the closing film (201),
said step of defining a layer of a material not heat-sealable with the closing film (201) comprises a sub-step of folding a first part of the semifinished portion (222) above a second part such that a part of the lower surface of a not heat-sealable material is, in the bonding step of the closing film (201), facing the latter.
In a 166th aspect according to the 162nd or 165th aspect, wherein the step of defining a layer of a material not heat-sealable with the closing film (201) comprises a sub-step of folding a portion of the support such that a surface of a not heat-sealable material is facing towards a same side of the support comprising a surface of heat-sealable material adapted to receive the closing film in engagement.
In a 167th aspect according to any one of the aspects from the 159th to the 166th, the step of making a notch and defining on an upper surface of the second semifinished portion (222) a layer of material not heat-sealable with the closing film (201) are combined in one step.
In a 168th aspect according to any one of the aspects from the 159th to the 167th, the process comprises a step of thermoforming the sheet material (200) for defining a precursor body comprising a plurality of semifinished supports (1c), each semifinished support (1c) comprising:
wherein the step of making a notch in the sheet material (200) provides to make at least one through cut on the perimetral edge (6) of each semifinished support (1c) for defining a first and second semifinished portions flanked to each other.
In a 169th aspect according to the preceding aspect, the layer of a material not heat-sealable with the closing film (201) is defined on the perimetral edge (6) of each semifinished support (1c).
In a 170th aspect according to the preceding aspect, the process comprises a step of making a through cut in the precursor body, on which the plurality of semifinished supports (1c) are defined, and in the closing film (201) associated to the precursor body for defining, at the end of the step of making the through cut, a plurality of single packages (1) according to any one of the preceding aspects.
Some embodiments and some aspects of the invention are described hereinafter with reference to the accompanying drawings, provided only for illustrative and, therefore, non-limiting purposes, in which:
It should be noted that in the present detailed description, corresponding parts illustrated in the various figures are indicated by the same reference numerals. The figures may illustrate the object of the invention by representations that are not in scale; therefore, parts and components illustrated in the figures relating to the object of the invention may relate solely to schematic representations.
The terms upstream and downstream refer to a direction of advancement of a package—or of a support for making said package—along a predetermined path starting from a starting or forming station of a support for said package, through a packaging station and then up to a package unloading station.
Definitions
Product
The term product P means an article or a composite of articles of any kind. For example, the product may be of a foodstuff type and be in solid, liquid or gel form, i.e. in the form of two or more of the aforementioned aggregation states. In the food sector, the product may comprise: meat, fish, cheese, treated meats, prepared and frozen meals of various kinds.
Control Unit
The packaging apparatus described and claimed herein includes at least one control unit designed to control the operations performed by the apparatus. The control unit can clearly be only one or be formed by a plurality of different control units according to the design choices and the operational needs. The term control unit means an electronic component which can comprise at least one of: a digital processor (for example comprising at least one selected from the group of: CPU, GPU, GPGPU), a memory (or memories), an analog circuit, or a combination of one or more digital processing units with one or more analog circuits. The control unit can be “configured” or “programmed” to perform some steps: this can be done in practice by any means that allows configuring or programming the control unit. For example, in the case of a control unit comprising one or more CPUs and one or more memories, one or more programs can be stored in appropriate memory banks connected to the CPU or to the CPUs; the program or programs contain instructions which, when executed by the CPU or the CPUs, program or configure the control unit to perform the operations described in relation to the control unit. Alternatively, if the control unit is or includes analog circuitry, then the control unit circuit may be designed to include circuitry configured, in use, for processing electrical signals so as to perform the steps related to control unit. The control unit may comprise one or more digital units, for example of the microprocessor type, or one or more analog units, or a suitable combination of digital and analog units; the control unit can be configured for coordinating all the actions necessary for executing an instruction and instruction sets.
Actuator
The term actuator means any device capable of causing movement on a body, for example on a command of the control unit (reception by the actuator of a command sent by the control unit). The actuator can be of an electric, pneumatic, mechanical (for example with a spring) type, or of another type.
Support
The term support means both a flat support and a tray comprising at least one base and at least one lateral wall emerging from the outer perimeter of the base and optionally a terminal flange emerging radially outwardly from an upper perimetral edge of the lateral wall. The outer flange can extend along a single prevailing development plane or can be shaped; in the case of a shaped outer flange, the latter may for example exhibit multiple portions extending along different prevailing development planes, particularly parallel but offset from each other. The portions of the shaped external flange can be radially offset.
The support defines a top surface on which the product P can be placed and/or a volume inside which the product can be housed.
The tray may comprise an upper edge portion emerging radially from a free edge of the lateral wall opposite the base: the upper edge portion emerges from the lateral wall in an outgoing direction relative to the tray volume.
The flat support can be of any shape, for example rectangular, rhomboidal, circular or elliptical; similarly, the tray with lateral wall can have a base of any shape, for example rectangular, rhomboidal, circular or elliptical. The support can be formed by means of a specific manufacturing process distinct from the packaging process or can be implemented in line with the packaging process.
The support can be made at least partly of paper material, optionally having at least 50% by weight, preferably at least 70% by weight, of organic material comprising one or more of cellulose, hemicellulose, lignin, lignin derivatives. The subject paper material extends between a first and a second prevailing development surface. The paper sheet material used for making the support may, in one embodiment variant, be covered by at least a part of the first and/or second prevailing development surface by means of a plastic coating, such as a food-grade film. If the coating is arranged so as to cover at least part of the first prevailing development surface, the same coating will define an inner surface of the support. Vice versa, if the coating is arranged on the second prevailing development surface, the same coating will define an outer surface of the support. The coating may also be heat-treated in such a way as to be able to act as an element for engaging and securing portions of the support as better described below. The coating may also be used to define a sort of barrier to water and/or humidity useful for preventing the weakening and loss of structurality of the support with consequent uncontrolled deformation of the paper material constituting the latter component. The coating can be applied to the paper material (as specified above on the inside and/or outside of the support) in the form of a so-called lacquer deposited from a solution or sprayed, the thickness whereof is generally comprised between 0.2 μm and 10 μm. Alternatively, the coating may comprise a plastic film, for example a polyethylene, which can be applied by means of a rolling process, on one or both sides (inner and/or outer side) of the paper material defining the support. In case the coating is applied by rolling, the values of the plastic film (coating) may, for example, range from 10 μm to 400 μm, in particular, from 20 μm to 200 μm, even more in particular, from 30 μm to 80 μm, of coating material (i.e., polyethylene). The plastic coating material may be selected, by way of example, from the following materials: PP, PE (HDPE, LDPE, MDPE, LLDPE), EVA, polyesters (including PET and PETg), PVdC.
The support may be alternatively made at least in part of a mono-layer or multilayer thermoplastic material. The support may be provided with gas barrier properties. As used herein, this term refers to a film or sheet of material that has an oxygen transmission rate of less than 200 cm3/(m2*day*bar), less than 150 cm3/(m2*day*bar), less than 100 cm3/(m2*day*bar) when measured in accordance with ASTM D-3985 at 23° C. and 0% relative humidity. Gas barrier materials suitable for single-layer thermoplastic containers are e.g. polyesters, polyamides, ethylene vinyl alcohol (EVOH), PVdC and the like.
The support may be made of a multilayer material comprising at least one layer of: one or more gas barrier layers, one or more heat-sealable layers (adapted to allow the sealing of the coating film to the support surface), one or more outer layers (for example polyamide or polypropylene or polyester).
The gas barrier polymers that can be used for the gas barrier layer are PVDC, EVOH, polyamides, polyesters and mixtures thereof. Generally, a PVDC barrier layer will contain plasticizers and/or stabilizers as known in the art. The thickness of the gas barrier layer will preferably be set in order to provide the material of which the support is composed with an oxygen transmission rate at 23° C. and 0% relative humidity of, less than 50 cm3/(m2*day*atm), preferably less than 10 cm3/(m2*day*atm), when measured in accordance with ASTM D-3985.
The heat-sealable layer will be selected from polyolefins, such as ethylene homo- or copolymers, propylene homo- or copolymers, ethylene/vinylacetate copolymers, ionomers and homo- or co-polyesters, e.g. PETG, a glycol-modified polyethylene terephthalate. A frangible layer that is easy to open can be positioned adjacent to the heat-sealable layer of the support to facilitate the opening of the final packaging. Blends of low-cohesion polymers which can be used as a frangible layer are for example those described in WO 99/54398.
Additional layers, such as adhesive layers, for example to make the gas barrier layer better adhere to the adjacent layers, may preferably be present in the multilayer material of the support and are selected based on the specific resins used for the gas barrier layer.
In the case of a multilayer structure, part of it can be formed as a foam. For example, the multilayer material used for forming the support can comprise (from the outermost layer to the layer of contact with the more internal foods) one or more structural layers, typically made of a material such as expanded polystyrene, expanded polyester or expanded polypropylene, or of cardboard, or sheet for example polypropylene, polystyrene, poly(vinyl chloride), polyester; a gas barrier layer and a heat-sealable layer.
The overall thickness of the support may be up to 5 mm. For example, the thickness may be between 0.04 mm and 3.00 mm, optionally between 0.05 mm and 1.50 mm, even more optionally between 0.6 mm and 1.00 mm. In one embodiment, the support comprises an overall thickness of between 0.06 and 0.4 mm.
The support may be made entirely of paper material (optionally coating in plastic film) or it may be entirely made of plastic material. Alternatively, the support may be at least partly made of paper material and at least partly of plastic material; in particular, the support is made internally of plastic material and externally covered at least partly in paper material.
The support can also be used to define so-called ready-meal packages; in this configuration, the supports are made so that they can be inserted in the oven for heating and/or cooking the food product placed in the package. In this embodiment (supports for ready-meal packages), the support can, for example, be made of paper material, in particular cardboard, covered with polyester or can be entirely made of a polyester resin. For example, supports suitable for ready-meal packages are made of PP, CPET, APET or APET/CPET, foamed or non-foamed materials. The support may further comprise a heat-sealable layer of a low melting material on the film. This hot-weldable layer can be co-extruded with a PET based layer (as described in patent applications No. EP-A-1, 529,797 and WO2007/093495) or it can be deposited on the base film by solvent deposition or by extrusion coating (for example described in U.S. Pat. No. 2,762,720 and EP-A-1, 252,008).
In a further embodiment, the support may be made at least partly of metal material, in particular aluminum. The support can also be made at least partly of aluminum and/or at least partly of paper material. In general, the support may be made of at least one of the following materials: plastic, paper, metal.
By the term not heat-sealable material of the support and in particular of a gripping portion 22 as will better be described hereinafter it is meant a material adapted to prevent the constraint (engagement or sealing) of a film, for example plastic, even when brought to a correct temperature adapted to allow the sealing thereof on materials suitable for receiving and sealing with said film. For example, the material of the closing film is plastic; in this configuration, the not heat-sealable material may comprise at least one selected from the group of the following materials:
Film
A film made of plastic material, in particular polymeric material, is applied to the supports (flat supports or trays), so as to create a fluid-tight package housing the product. In order to make a vacuum pack, the film applied to the support is typically a flexible multilayer material comprising at least a first outer heat-weldable layer capable of welding to the inner surface of the support, optionally a gas barrier layer and a second, heat-resistant outer layer.
If it is desired to make a modified atmosphere package (MAP) or a package under natural atmosphere (non-modified atmosphere), the film applied with the support (film made of plastic, in particular polymeric material) may typically be single-layer or multilayer. In the case of a multilayer sheet, the film may comprise at least one of: one or more gas barrier layers, one or more heat-sealable layers (layers adapted to allow a plastic film to be welded to the support), one or more heat-resistant layers, one or more outer layers (for example polyamide or polypropylene or polyester).
For use in a skin-pack or VSP packaging process, plastic materials, especially polymers, should be easily formed as the film needs to be stretched and softened by contact with the heating plate before it is laid on the product and the support. The film must rest on the product conforming to its shape and possibly to the internal shape of the support.
The heat-sealable (for example outer) layer may comprise any polymer capable of welding to the inner surface of the support. Suitable polymers for the heat-sealable layer can be ethylene and ethylene copolymers, such as LDPE, ethylene/alpha-olefin copolymers, ethylene/acrylic acid copolymers, ethylene/vinyl acetate copolymers or ethylene/vinyl acetate copolymers, ionomers, co-polyesters, for example PETG. Preferred materials for the heat-sealable layer are LDPE, ethylene/alpha-olefin copolymers, e.g. LLDPE, ionomers, ethylene/vinyl acetate copolymers and mixtures thereof.
Depending on the product to be packaged, the film may comprise a gas barrier layer. The gas barrier layer typically comprises oxygen-impermeable resins such as PVDC, EVOH, polyamides and mixtures of EVOH and polyamides. Typically, the thickness of the gas barrier layer is set to provide the film with an oxygen transmission rate of 23° C. and 0% relative humidity of, less than 100 cm3/m2*m2*atm, preferably less than 50 cm3/(m2*day*atm), when measured in accordance with ASTM D-3985. Common polymers for the heat-resistant outer layer are, for example, ethylene homo- or copolymers, in particular HDPE, ethylene copolymers and cyclic olefins, such as ethylene/norbornene copolymers, propylene homo- or copolymers, ionomers, polyesters, polyamides.
The film in its multilayer form may further comprise other layers such as adhesive layers, filling layers and the like to provide the thickness necessary for the film and improve its mechanical properties, such as puncture resistance, abuse resistance, formability and the like. The film is obtainable by any suitable co-extrusion process, through a flat or circular extrusion head, optionally by co-extrusion or by hot blow molding.
Again for use in a skin-pack or VSP packaging process, the film is substantially non-oriented. Typically, the film, or only one or more of its layers, is cross-linked to improve, for example, the strength of the film and/or heat resistance when the film is brought into contact with the heating plate during the vacuum skin packaging process. Crosslinking can be achieved by using chemical additives or by subjecting the film layers to an energy-radiation treatment, such as high-energy electron beam treatment, to induce crosslinking between molecules of the irradiated material. Films suitable for this application may have a thickness in the range between 50 μm and 500 μm, optionally between 60 μm and 3000 μm, even more optionally between 65 μm and 100 μm.
For use in packaging processes of products under controlled atmosphere (MAP) or in a natural atmosphere (unmodified atmosphere), the film applied to the substrate (plastic film, in particular polymeric) is typically mono-layer or multilayer, having at least one heat-sealable layer, optionally capable of thermo-retracting under heat action. The applied film may further comprise at least one gas barrier layer and optionally an heat-resistant outer layer. In particular, the film can be obtained by co-extrusion and lamination processes. The film may have a symmetrical or asymmetrical structure and may be single-layer or multilayer. Multilayer films are composed of at least two layers, more frequently at least five layers, often at least seven layers.
The total thickness of the film can range from 30 μm to 500 μm, optionally from 40 μm to 300 μm, even more optionally from 50 μm to 200 μm; in one embodiment the film, has a thickness of between 65 μm and 100 μm. The films may possibly be cross-linked. Crosslinking can be achieved by irradiation with high energy electrons at an appropriate dosage level as known in the art. The films described above can be heat-shrinkable or heat-curable. Heat-shrinkable films normally show a free shrinking value at 120° C. (value measured in accordance with ASTM D2732, in oil) in the range from 2% to 80%, normally from 5% to 60%, in particular from 10% to 40% in both longitudinal and transverse directions. Heat-curable films normally have a shrinkage value of less than 10% at 120° C., normally less than 5% both in the transverse and longitudinal direction (measured in accordance with the ASTM D2732 method, in oil). Films normally comprise at least one heat-sealable layer and an outer layer (the outermost) generally consisting of heat-resistant polymers or polyolefins. The welding layer typically comprises a heat-sealable polyolefin which in turn comprises a single polyolefin or a mixture of two or more polyolefins such as polyethylene or polypropylene or a mixture thereof. The welding layer may also be provided with anti-fogging properties through known techniques, for example by incorporation in its composition of anti-fogging additives or through a coating or a spraying of one or more anti-fogging additives that counteract the fogging on the surface of the welding layer. The welding layer may also comprise one or more plasticizers. The outermost layer may comprise polyesters, polyamides or polyolefins. In some structures, a mixture of polyamide and polyester can be used for the outermost layer. In some cases, the films include a gas barrier layer. Barrier films normally have an oxygen transmission rate, also called OTR (Oxygen Transmission Rate) below 200 cm3/(m2*day*atm) and more frequently below 80 cm3/(m2*day*atm) evaluated at 23° C. and 0% RH measured in accordance with the ASTM D-3985 method. The barrier layer is normally made of a thermoplastic resin selected from a saponified or hydrolyzed product of ethylene-vinyl acetate copolymer (EVOH), an amorphous polyamide and vinyl-vinylidene chloride and mixtures thereof. Some materials include an EVOH barrier layer, layered between two polyamide layers. In some packaging applications, films do not include any gas barrier layer. These films usually comprise one or more polyolefins as defined herein. Non-gas barrier films normally have an OTR (evaluated at 23° C. and 0% RH in accordance with ASTM D-3985) of 100 cm3/(m2*day*atm) up to 10000 cm3/(m2*day*atm), more often up to 6000 cm3/(m2*day*atm).
Peculiar compositions based on polyester are those used for the films of the so-called ready-meals. For these films, the polyester resins of the film may constitute at least 50%, 60%, 70%, 80% and 90% by weight of the film. These films are normally used in combination with supports, especially trays, made from polyester. In the case of packages for fresh red meat, a double film may be used, comprising an oxygen permeable inner film and an oxygen impermeable outer film. The combination of these two films greatly prevents discoloration of the meat even in the most critical situation in the barrier packaging of fresh meat or when the packaged meat extends outside the cavity defined by the tray, or in which the product emerges from the upper perimetral edge of the lateral wall. These films are described for example in European patent applications EP1848635 and EP0690012.
The film may be single-layer. The typical composition of the single-layer films comprises the polyesters as defined herein and mixtures thereof or the polyolefins as defined herein and mixtures thereof. In all the film layers described herein, the polymeric components may contain suitable amounts of additives normally included in such compositions. Some of these additives are normally included in the outer layers or in one of the outer layers, while others are normally added to the inner layers. These additives include slipping or anti-blocking agents such as talc, waxes, silica and the like, or antioxidant agents, stabilizers, plasticizers, fillers, pigments and dyes, cross-linking inhibitors, cross-linking agents, UV absorbers, odor absorbers, oxygen absorbers, bactericides, antistatic agents, antifog agents or compositions and similar additives known to the man skilled in the art of packaging.
The films may have one or more holes adapted to allow the fluid communication between the inner volume of the package and the external environment, or, in the case of a food product, allow the packaged food to exchange gas with the outside; the perforation of the films can, for example, be performed by means of a laser beam or mechanical means, such as rollers provided with needles. The number of perforations applied and the size of the holes influence the permeability to the gases of the film itself. Micro-perforated films are usually characterized by OTR values (evaluated at 23° C. and 0% RH in accordance with ASTM D-3985) of 2500 cm3/(m2*day*atm) up to 1000000 cm3/(m2*day*atm). Macro-perforated films are usually characterized by OTR values (evaluated at 23° C. and 0% RH in accordance with ASTM D-3985) higher than 1000000 cm3/(m2*day*atm).
Furthermore, the films described herein can be formulated to provide strong welds with the support or tray or peelable from the tray/support. For example, the film may be of a multilayer type and have at least one easy to open frangible or peelable layer which can be positioned adjacent a heat-sealable layer to facilitate the opening of the final packaging: the frangible or peelable layer is adapted to allow easy removal of the same film from the support to which it is associated. A method of measuring the strength of a weld, herein referred to as a “welding force, is described in ASTM F-88-00. Acceptable welding force values to have a peelable weld are between 100 g/25 mm and 850 g/25 mm, 150 g/25 mm to 800 g/25 mm, 200 g/25 mm to 700 g/25 mm.
Material Specifications
The term paper material means paper or cardboard; in particular, the sheet material that can be used to make the support can have a weight of between 30 g/m2 and 600 g/m2, in particular between 40 g/m2 and 500 g/m2, even more particularly between 50 g/m2 and 250 g/m2.
PVDC is any vinylidene chloride copolymer in which a prevalent amount of the copolymer comprises vinylidene chloride and a lower amount of the copolymer comprises one or more unsaturated monomers copolymerizable therewith, typically vinyl chloride and alkyl acrylates or methacrylates (for example methyl acrylate or methacrylate) and mixtures thereof in different proportions.
The term EVOH includes saponified or hydrolyzed ethylene-vinyl acetate copolymers and refers to ethylene/vinyl alcohol copolymers having an ethylene co-monomer content preferably composed of a percentage of from about 28 mole % to about 48 mole %, more preferably from about 32 mole % and about 44 mole % of ethylene and even more preferably, and a saponification degree of at least 85%, preferably at least 90%.
The term polyamides is meant to indicate homo- and co- or ter-polymers. This term specifically includes aliphatic polyamides or co-polyamides, e.g. polyamide 6, polyamide 11, polyamide 12, polyamide 66, polyamide 69, polyamide 610, polyamide 612, copolyamide 6/9, copolyamide 6/10, copolyamide 6/12, copolyamide 6/66, copolyamide 6/69, aromatic and partly aromatic polyamides or copolyamides, such as polyamide 61, polyamide 6I/6T, polyamide MXD6, polyamide MXD6/MXDI, and mixtures thereof.
The term polyesters refers to polymers obtained from the polycondensation reaction of dicarboxylic acids with dihydroxylic alcohols. Suitable dicarboxylic acids are, for example, terephthalic acid, isophthalic acid, 2,6-naphthalene dicarboxylic acid and the like. Suitable dihydroxylic alcohols are for example ethylene glycol, diethylene glycol, 1,4-butanediol, 1,4-cyclohexanodimethanol and the like. Examples of useful polyesters include poly(ethylene terephthalate) and copolyesters obtained by reaction of one or more carboxylic acids with one or more dihydroxylic alcohols.
The term copolymer means a polymer derived from two or more types of monomers and includes terpolymers. Ethylene homo-polymers include high density polyethylene (HDPE) and low density polyethylene (LDPE). Ethylene copolymers include ethylene/alphaolefin copolymers and unsaturated ethylene/ester copolymers. The ethylne/alpha-olefin copolymers generally include copolymers of ethylene and one or more co-monomers selected from alpha-olefins having between 3 and 20 carbon atoms, such as 1-butene, 1-pentene, 1-hexene, 1-octene, 4-methyl-1-pentene and the like. Ethylene/alpha-olefin copolymers generally have a density in the range of from about 0.86 g/cm3 to about 0.94 g/cm3. It is generally understood that the term linear low density polyethylene (LLDPE) includes that group of ethylene/alpha-olefin copolymers which fall in the density range of between about 0.915 g/cm3 and about 0.94 g/cm3 and in particular between about 0.915 g/cm3 and about 0.925 g/cm3. Sometimes, linear polyethylene in the density range between about 0.926 g/cm3 and about 0.94 g/cm3 is referred to as linear medium density polyethylene (LMDPE). Lower density ethylene/alpha-olefin copolymers may be referred to as very low density polyethylene (VLDPE) and ultra-low density polyethylene (ULDPE). Ethylene/alpha-olefin copolymers can be obtained with heterogeneous or homogeneous polymerization processes. Another useful ethylene copolymer is an unsaturated ethylene/ester copolymer, which is the ethylene copolymer and one or more unsaturated ester monomers. Useful unsaturated esters include vinyl esters of aliphatic carboxylic acids, in which esters have between 4 and 12 carbon atoms, such as vinyl acetate, and alkyl esters of acrylic or methacrylic acid, in which esters have between 4 and 12 carbon atoms. Ionomers are copolymers of an ethylene and an unsaturated mono-carboxylic acid having the carboxylic acid neutralized by a metal ion, such as zinc or, preferably, sodium. Useful propylene copolymers include propylene/ethylene copolymers, which are copolymers of propylene and ethylene having a percentage by weight content mostly of propylene and propylene/ethylene/butene ter-polymers, which are copolymers of propylene, ethylene and 1-butene.
Package
Reference numeral 100 indicates as a whole a package configured for containing at least one product P, for example of a food type.
As can be seen for example in
In the accompanying figures, a support 1 having a polygonal shape, in particular rectangular, is illustrated. However, the possibility of providing a support 1 having a square, rhomboidal, triangular, elliptical, circular, semicircular shape or a combination thereof is not excluded. The support 1 is made of sheet material and comprises at least one base 2 representing the part of the support 1 suitable for receiving the product P directly; the support 1 further comprises at least one perimetral edge 6 which completely surrounds the base 2. The perimetral edge 6 represents the support portion 1 adapted to engage the film 10 for closing the package 100 and adapted to define—in cooperation with said film 10—the fluid-tight housing compartment 5 for containing the product P. The fluid-tight package 100 may then have a housing compartment 5 in which there is a lower pressure than the atmospheric pressure to define a vacuum package 100 (so-called “SKIN” type package). Alternatively, the fluid-tight package may have a housing compartment 5 in which a predetermined gas or gas mixture is present to define a modified atmosphere package 100 (so-called “MAP” type package). The package may also be normally sealed without a modified atmosphere or a pressure lower than he atmospheric within the housing compartment 5.
The perimetral edge 6 may comprise an external flange 30 (see for example
In greater detail, in the tray-shaped configuration of the support 1, the latter may comprise a bottom wall 8 and a lateral wall 7 emerging in height from the bottom wall 8 transversely to the latter (see, for example,
As can be seen in the accompanying figures, the lateral wall 7 defines an opposite free edge with respect to the bottom wall 8 and delimiting an upper opening of the support 1 (upper opening of the tray). In other words, the free edge represents an upper edge of the support 1 which defines the opening of the same support 1 through which the product P—for example the food product—is passed to be positioned in the housing compartment 1 and to be covered by the closing film 10 at the time of packaging. The free edge of the lateral wall 7 has a shape according to the shape of an outer perimeter of the bottom wall 8. In fact, the accompanying figures show an embodiment of the support 1 in which the outer perimeter of the lateral wall 7 both have a rectangular shape.
As can be seen in the accompanying figures, the closing film 10 is engaged, optionally fluid-tightly, with the perimetral edge 6 and in particular with the flange 30. In particular, the closing film 10 is at least partly engaged with the flange 30 so that the housing compartment 5 is fluid-tight. The closing film 10 extends in thickness between a first and a second surface 10a, 10b while the support 1 extends in thickness between a first and a second surface 1a, 1b: the second surface 10b of the closing film 10 is engaged with at least part of the first surface 1a of the support 1 (see, for example,
As can be seen in the accompanying figures, the support 1 comprises a removable portion 21 which extends as a prolongation of the perimetral edge 6 away from the base 2; the removable portion 21, as will be better explained below, is configured for being separated together with the closing film 10 from the support 1 during an opening step of the package 100.
In fact, as specified above, the package 100 is configured for defining a closing condition in which the closing film 10, in cooperation with the support 1, inhibits access to the housing compartment 5 of the product P (see for example
The removable portion 21 is also engaged with the closing film 10 and is configured for being removed, during an opening step of the package 100, from the support 1 together with at least part of the closing film 10. In detail, the removable portion 21 is stably engaged to a closing film portion 10 such that during an open condition of the package, the removable portion 21 can be raised together with the closing film 10 with respect to the rest of the support 1 in a manner such as to be able to remove said film 10 from the package 100.
In one embodiment illustrated in
In a further embodiment illustrated for example in
As can be seen in the accompanying figures, the removable portion 21 has a cavity 21a the concavity whereof, at least in the closed condition of the package, is facing towards the perimetral edge 6; in particular, the concavity of said cavity 21a is facing towards the base of the support and more particularly towards the portion 6a of the perimetral edge 6 from which the removable portion 21 itself extends as a prolongation (see, for example,
As can be seen in the accompanying figures, the removable portion 21 and at least part of the perimetral edge 6, at least in the closed condition of the package, delimit an opening; in greater detail, the opening is essentially interposed between the removable portion 21 and the flange 30. At least in the closed condition of the package 100, the film 10 is engaged to the flange 30 and to the removable portion 21 and placed to cover the entire opening.
As visible, for example, in the accompanying figures, the support 1 may comprise at least one angular portion 11; for example, in the accompanying figures an embodiment of the support 1 is shown having a substantially rectangular shape, thus exhibiting four angular portions 11. In the tray-like support 1 configuration, the angular portions are defined on the bottom wall 8, on the lateral wall 7 and on the flange 30; each angular portion 11 essentially comprises a fitting. The removable portion 21 is defined at at least one angular portion 11 as illustrated for example in
From the point of view of the material, the removable portion 21 may have a mechanical stiffness greater than a mechanical stiffness of the closing film 10. In particular, the removable portion 21 may have a mechanical stiffness substantially identical to a mechanical stiffness of the perimetral edge 6 of the support 1; the mechanical stiffness of the removable portion 21 and of the closing film 10 is measured by traction and/or bending. In the case where the removable portion 21 and the closing film 10 are made of the same material, the removable portion 21 may have a thickness greater than the corresponding thickness of the closing film 10, so as to obtain said greater mechanical stiffness; in this condition, the removable portion 21 may for example have a thickness at least 1.5 times, in particular 3 times, greater than a thickness of the closing film 10.
The support 1 further comprises a gripping portion 22 emerging from the perimetral edge 6 and disposed, at least in the closed condition of the package 100, at least partly within the cavity 21a of the removable portion 21. In greater detail, the gripping portion 22 extends as a prolongation of the perimetral edge 6 away from the base 2: the gripping portion 22 extends as a prolongation of the portion itself 6a of the perimetral edge 6, from which, in the closed condition of the package, the removable portion 21 extends as a prolongation. In fact, the gripping portion 22 extends predominantly along a prevailing development direction parallel to a prevailing development direction of the removable portion 21, at least in the closed condition of the package 100. In even greater detail, the gripping portion 22, at least in the closed condition of the package, is interposed between the removable portion 21 and the perimetral edge 6: in particular, the gripping portion 22, at least in the closed condition of the package, is interposed between the removable portion 21 and the portion 6a of the perimetral edge 6 from which the same portions 21 and 22 extend as a prolongation.
As can be seen in the accompanying figures, the gripping portion 22 is coplanar with the at least said portion 6a of the perimetral edge 6, in particular the flange 30 of said edge 6. In particular, as shown in
The gripping portion 22 is connected directly to the perimetral edge 6 of the support 1. In one embodiment, the gripping portion 22 is integrally joined to the perimetral edge 6 of the support 1, in particular integrally joined to the flange 30. The gripping portion 22 comprises a tab extending in thickness between a first surface extending without continuity to the first surface 1a of the support 1 and a second surface extending seamlessly to the second surface 1b of the support 1.
In an embodiment, the gripping portion 22 comprises a tab emerging from the perimetral edge 6 and lying on a plane: the lying planes of the gripping portion 22 and of the removable portion 21 are—at least in the closed condition of the package—parallel to each other. In general, the tab of the gripping portion 22 and of the removable portion 21, at least in the closed condition of the package 100, are parallel to each other. In the configuration of the package 100 with support 1 of the tray type, the gripping portion 22 essentially emerges from the lateral wall 7 away from the latter and from the bottom wall 8. As described above, the support 1 may comprise one or more angular portions 11; the gripping portion 22 is disposed at the same angular portion 11 at which the removable portion 21 is disposed. The gripping portion 22 is at least partly counter-shaped to the cavity 21a of the removable portion 21 and is entirely disposed (contained) within said cavity 21a. In particular, the gripping portion 22 is entirely disposed within the cavity 21a and entirely interposed, at least in the closed condition of the package, between the perimetral edge 6 (optionally the flange 30) and the removable portion 21. In other words, the gripping portion 22 extends starting from a section of an outer perimeter delimiting the opening defined between the edge 6 and the removable portion 21, within said opening.
In an embodiment shown in
In an embodiment variant for example shown in
The bottom wall 8 and the lateral wall 7 may be made in one piece; as better described below, the bottom wall 8 and the lateral wall 7 are obtained by means of plastic deformation, in particular by thermoforming, of the same sheet material. The base 2, the lateral wall 7, the perimetral edge 6, the flange 30 and the gripping portion 22 form a single solid body made of plastic material. In the embodiment in which the removable portion 21 is joined to the edge 6 by the weakening portion 25, the removable portion 21 is then integrally joined to the base 2, lateral wall 7, perimetral edge 6, flange 30 and gripping portion 22.
As specified above, the gripping portion 22 is integrally joined (directly carried) and therefore constrained to the perimetral edge 6, optionally by the flange 30, of the support 1; the gripping portion 22 is in particular only constrained directly to the perimetral edge 6 (optionally to the flange 30) of the support 1: the gripping portion 22 is not directly constrained to the closing film 10. In other words, the gripping portion 22, in the closed condition of the package, has an upper surface adapted to receive in abutment the closing film 10 and released from (not firmly engaged with) the closing film 10. In fact, the gripping portion 22 is configured for defining a constraint with the closing film 10 by simple contact or support.
As described above, the closing film 10 is made of plastic material; the film 10 is engaged with the support 1 by means of a heat-sealing action: the film 10 and the support 1 are made of heat-sealable material and therefore capable of ensuring a stable engagement (welding) with each other.
In one embodiment, the gripping portion 22 comprises a support portion 22a and a coating layer 22b adapted to cover at least partially the support portion 22a (see, for example,
In particular, in the embodiments of the package 100 for example shown in
On a functional level, the gripping portion 22 is configured for being firmly gripped by a user during an opening step of the package 100 (see
In the pre-opening condition of the package, the closing film 10 is distanced from the gripping portion 22 so that such gripping portion is grippable by an user. In fact, in the pre-opening condition, the user can keep the package 100 in position by means of the gripping portion 22 and a first step of removing the removable portion 21 together with the closing film 10 begins.
As mentioned above, the greater mechanical stiffness of the removable portion 21 provides the user with a considerably more stable grip than in a case in which the grip occurred directly on a portion of the closing film 10. Moreover, the difference in mechanical stiffness between the removable portion 21 and the closing film 10 provides the user with a better tactile perception, facilitating the user in the step of locating the removable portion 21 during an opening step. In this way, it is certainly possible to facilitate both the pre-opening condition of the package for raising the removable portion 21 and the advanced open condition of the package during which the film 10 is removed from the support 1.
Process of Making Said Package 100
Another object of the present invention is a process for making the package 100, according to any one of the appended claims and/or according to the description given above.
The process described below uses the apparatus 300 described and claimed below in one or more of the accompanying claims. It should also be noted that, according to a further aspect of the invention, the various method steps described below can be carried out by a control unit 311 (
The process contemplates providing a sheet material 200 along a predetermined advancement path A; such a step involves unwinding the sheet material 200 itself in a web configuration from a reel, such as for example schematized in
In fact, the base 2 and the perimetral edge 6 of each semifinished support 1a are respectively configured for defining, at the end of the process, the base 2 and the edge 6 of the support 1 of the finished package 100. In particular, the thermoforming step is adapted to define the lateral wall 7, the bottom wall 8 and the flange 30 of the support 1.
The process comprises a notching step of the sheet material 200 in order to define on the same a first and second semifinished portions 221, 222 flanked to each other. The notch passes through the sheet material 200 and in particular defined at the edge 6 of each semifinished support 1c. As can be seen, for example, in
The first semifinished portion 221 of the support 1a is configured for defining the removable portion 21 of a support 1 while the second semifinished portion 222 is configured for defining the gripping portion 22 of the support 1; during the notching step of the sheet material, the cavity 21a of the removable portion 21 is delimited.
The notching step may be carried out in such a way that the removable portion 21 is completely separated from the base (
The process also provides for a step of defining a layer of a not heat-sealable material 222a on a portion of an upper surface of the second semifinished portion 222a adapted to prevent the constraint (sealing) of a closing film on said second semifinished portion 222. For example, the step of defining said not heat sealable material 222a may include a step of applying on a portion of the sheet material 200 at least one of the following materials selected from the group of the following materials:
The application of the coating layer 22b on the sheet material 200 may for example be carried out by means of a printing step (for example in the case where the material 22b is ink or wax) or by the adhesion (for example gluing) of said layer 22b (for example in the case where the layer is plastic or paper). The not heat sealable material 222a applied to the sheet material 200 is configured for defining, at the end of the packaging process, the coating layer 22b of the package 100. This application step may be carried out prior to the notching step of the sheet material 200, such as for example shown in
Alternatively, the step of defining said not heat sealable layer on the sheet material 200 may comprise a folding step of the second semifinished portion; for example, in the case in which the sheet material 200 is defined in thickness between an upper surface of heat-sealable material and a lower surface of a not heat-sealable material, the process may provide for folding a first part of the semifinished portion 222 above a second part in such a way that:
The folding step of the second semifinished portion 222 allows overlapping the first and second part of said portion 222 in order to dispose the lower surface of not heat-sealable material of the first part adjacent to an upper surface of the first semifinished portion configured for receiving a closing film. This folding step allows obtaining packages 100 as illustrated for example in
The process further provides for positioning at least one product P on the base 2 of the sheet material 200 (
The positioning of the product P on the sheet material, and specifically on the base 2 of each semifinished support 1c of said sheet material 200, may be performed manually by an operator or automatically by means of a special positioning station 304.
Only following the positioning of the product P and following the definition of the layer of material not heat-sealable on the second semifinished portion 222, the process comprises a step of constraining a closing film 201 to at least one portion of the sheet material 200 so that the product P is positioned inside a housing compartment 5 defined by the closing film 201 constrained to said sheet material 200. In particular, the closing film 201 is constrained at least to the edge 6 of each semifinished support 1c of the precursor body. The step of constraining the film 201 takes place by means of heat-sealing (see
The process may further comprise a step—after that of positioning the product P on the base 2 and before that of constraining the closing film 201—of removing at least part of the air from the housing compartment 5 in order to define inside the latter a pressure less than the atmospheric pressure to make skin-type vacuum packages. Alternatively, the process can provide for the removal of at least part of the air from the housing compartment 5 and the insertion inside the latter of a predetermined type of gas to make a modified atmosphere package.
The film 201 may also be in the form of a continuous film and be unwound from a reel as shown in
A further step of the manufacturing process, subsequent to the step of constraining a closing film 201 to the edge 6 of the sheet material 200, provides for the through cut of the sheet 200 and of the closing film 201 which through cut, in cooperation with the notch made on the sheet material 200 is adapted to delimit the removable portion 21 and in particular to define said package 100.
In greater detail, the through-cutting step comprises cutting the precursor body and, at the same time, the closing film 201 constrained on said precursor body so as to define individual packages 100. In fact, the through cut allows the separation of the semifinished supports 1c of the sheet material 200 to define individual supports 1 on which the film 10 defined by a portion of the continuous closing film 201 is fluid-tightly constrained. The through-cutting steps are schematically illustrated in
Alternatively, the process may include the use of supports 1, or trays, preformed, made for example on a forming line separate from the packaging line.
The processes shown in
Apparatus for Making Said Package
Another object of the present invention is an apparatus 300 for making packages 100 according to one or more of the appended claims and/or according to the description given above. In particular, the apparatus 300 is configured to perform the process claimed and/or described above used for making said package 100.
In a first embodiment illustrated in
The apparatus 300 comprises at least one frame 301 configured for supporting one or more operating stations and ensuring stability during the operating steps. The apparatus 300 further comprises a first supplying assembly 301 shown in
The movement of the sheet material 200 along a predetermined advancement path A of the sheet material 200 is ensured by the presence of a conveyor 302, shown in
Downstream of the first supplying group 301 of the sheet material 200, the apparatus 300 may comprise at least one thermoforming station 308, shown in
Subsequently to the thermoforming station 308 and/or to the first supplying group 301 with respect to the advancement path A of the sheet material 200, the apparatus 300 comprises (in the first embodiment thereof) a printing station 305 of the not heat-sealing material 222a on the sheet material 200. The printing station 305 may for example comprise a printing station configured for applying on the sheet material at least one selected from the group among the following materials:
Downstream of the printing station 305, the apparatus 300 comprises at least one notching station 306, shown in
In any case, the possibility of arranging the notching station 306 upstream of the printing station 305 in such a way that the apparatus can first form the first and second semifinished portion 221, 222 and subsequently carry out the application of the not heat-sealing material 222a on the second semifinished portion 222 is not excluded.
The apparatus 300 further comprises a positioning station 304, shown in
Subsequent to the positioning station 304 with respect to the advancement path A of the sheet material 200, the apparatus 300 comprises a second supplying assembly 303 shown in
Downstream of the second supplying assembly 303 with respect to the advancement path A of the sheet material 200, the apparatus 300 comprises a packaging station 307, shown in
As described above, due to the presence of the not heat sealable material 222a, the packaging station is capable of sealing the closing film 201 to the edge 6, optionally to the base 2 and to the first semifinished portion 221: the closing film 201 is not capable of sealing to the second semifinished portion due to the presence of the material 222a.
The packaging station 307 may be provided with a suction system configured for removing air from the inside of the packaging station 307 itself so as to define a pressure lower than atmospheric pressure. In a further embodiment, the packaging station 307 is configured for removing air from the housing compartment 5 when the closing film 201 is fluid-tightly engaged to the sheet material 200. Optionally, the packaging station 307 may be provided with a blowing system configured for injecting gas into the packaging station 307 in order to obtain a modified atmosphere environment. The packaging station 307 optionally includes a heater of the closing film 201 so as to facilitate the correct distribution of the closing film 201 around the product P.
Downstream of the packaging station 307 with respect to the advancement path A of the sheet material 200, the apparatus 300 comprises a pre-cutting station 309, shown in
Downstream of the pre-cutting station 309 with respect to the advancement path A of the sheet material 200, the apparatus 300 comprises at least one cutting station 310, shown in
In a second embodiment of the apparatus illustrated for example in
The folding station 330 may be distinguished from the cutting portion 306 and be disposed in interposition between the latter and the packaging station 307;
The folding station 330 comprises at least one pusher 331 configured for moving relative to the sheet material 200 at least between:
In detail, the pusher 331, in the retracted position, is placed, in the conditions of use of the apparatus 300, below and distanced from the sheet material 200. The pusher 331, in the retracted position, is in particular configured for being spaced from the second not heat-sealable surface of the second semifinished portion 222. The pusher 331 in the retracted position is illustrated, for example, in
The pusher 331, after raising from the second semifinished portion 222, is configured for returning to the retracted position (
The pusher is moved by a first actuator 331a which is configured for moving the pusher 331 from the retracted position to the advanced position, and vice versa. The first actuator 331a may be of the pneumatic, electrical, electromechanical type.
The folding station 330 is also provided with a pressure member 332 configured for disposing itself, at least in the retracted position of the pusher 331, opposed to the pusher 331 with respect to the sheet material 200. In fact, in the embodiment, shown in
The pressure member 332 is moved by a second actuator 332a configured for moving said pressure member 332 from the starting position to the crushing position, and vice versa. The second actuator 332a may be of the pneumatic, electrical, electromechanical type.
The apparatus 300 may comprise a control unit 311 connected to the first and second actuators 331a, 332a and configured for:
In particular, the control unit 311 is configured for controlling the advanced position of the pusher 331 and at the same time controlling the starting position of the pressure member 332; the control unit 311 is configured for sequentially controlling the advanced position of the pusher 331 and the retracted position such that immediately after raising the second semifinished portion 222, the pusher can release said second portion and move away: only after having raised the second semifinished portion 222 and controlled the retracted position of the pusher 331, the control unit 311 is configured for controlling the crushing position of the pressure member 332 so as to define said gripping portion 22. At the end of the forming step of the gripping portion 22, the pressure member 332 is returned to the starting position: the pusher 331 is instead in the retracted position.
The folding station 330 may comprise a counter-thrust tool 333 configured for disposing itself against the pusher 331 with respect to the sheet material 200; in particular, the counter-thrust tool 333 is configured for disposing itself on the same side of the sheet material 200 on which the pressure member 332 is disposed, opposite to the pusher 331. The counter-thrust tool 333 is configured for resting on an edge portion of the sheet material 200 placed next to the second semifinished portion 222 for keeping said sheet material 200 in a predetermined position at least during the passage of the pusher 331 from the retracted position to advanced position. In fact, the counter-thrust tool 333 defines an abutment element of the sheet material adapted to prevent undesired displacements (lifting) of the sheet material during the action of the pusher 331 (lifting) on the second semifinished portion 222.
The counter-thrust tool 333 is also configured for moving relative to the sheet material 200 at least between two different positions, in particular at least between:
The counter-thrust tool 333 is configured for being placed in the abutment position when the pusher 331 is still in the retracted position or in any case before said pusher contacts the second semifinished portion 222; the pusher 331 is then brought by the first actuator 331a to the advanced position only when the counter-thrust tool 333 is in the abutment position.
As regards instead the pressure member 332, the latter is configured for moving from the starting position to the crushing position during the distanced position of the counter-thrust tool 333. In fact, as a result of lifting of the second semifinished portion 222, the pusher and the counter-thrust tool are configured for distancing themselves from the sheet material so as to allow the pressure member to act on the raised second semifinished portion.
The counter-thrust tool 333 is movable by means of a third actuator 333a, distinct from the first and second actuators, configured for controlling the distanced and abutment position. The third actuator 333a may be of the pneumatic, electrical or electromechanical type. The control unit 311 is further connected to said third actuator 333a and configured for controlling the distanced and abutment position of the counter-thrust tool 333; in particular, the control unit 311 is configured for synchronizing the actuation of said third actuator 333 with the actuation of said first and second actuators 331a, 332a to allow the pusher 331 to raise the second semifinished portion and, only subsequently, allow the pressure member 332 to crush said raised second semifinished portion for defining said gripping portion 22. In fact, the control unit 311, only after having controlled the abutment position of the counter-thrust tool 333, is configured for controlling the advancement position of the pusher 331; the control unit 311, only after having controlled the distanced position of the pusher 331 is configured for controlling the crushing position of the pressure element 332.
In the embodiment of the folding station 330 illustrated in
The blade 306a is moved by a respective actuator 306b, optionally distinct from the first, second and, if present, the third actuator, described above. The blade 306a is actuated when the pusher 331 is in its retracted position and the pressure member is in the starting position. In fact, the blade 306a is the first member which is actuated to define the first and second semifinished portions 221, 222; only thereafter, the pusher is actuated to lift the second portion 222 and the pressure member brought into the crushing position to define the second gripping portion 22.
In a first embodiment of the notching station 306 shown in
In a second embodiment of the notching station 306 shown in
As described above, the pusher 331 is used for lifting and then deforming the second semifinished portion 222; in an embodiment variant, the pusher 331, or if present the counter-thrust tool 333, may comprise a heating element (for example a resistor integrated in the body of the pusher 331 or in the body of the tool 333) configured for allowing the heating of the sheet material 200 to facilitate the folding (deformation) of the second semifinished portion 222. Moreover, a heating element may be further carried by the pressure member 332 such that the heat can stabilize the folding of the second semifinished portion 222 to define a stable gripping portion 22.
It should be noted that, in the case in which the sheet material 200 exhibits a plurality of semifinished supports 1c as shown in
As described above, the apparatus 300 may comprise a control unit 311 which may also be connected to the conveyor 302, to the second supplying group 303, to the packaging station 307, to the first notching station 306 and to the cutting station 310, to the printing station 305, optionally to the folding station 330. The control unit 311 is optionally connected to the positioning station 304, to the pre-cutting station 309 and/or to the cutting station 310. Optionally, said control unit 311 is also connected to the first supplying assembly 301.
The control unit 311 is configured for controlling the conveyor 302 to allow movement of the sheet material 200 along the operating path at a predetermined speed, for controlling the supplying assembly 303 adapted to supply the closing film 201, for controlling the packaging station 307 so as to allow engagement of the closing film 201—or closing film portion 201a—on the sheet material 200, for controlling the pre-cutting station 309 for defining one or more notches on the closing film, for controlling the cutting station 310 for the formation of the packages 100.
The control unit 311 is therefore configured for synchronizing the performance of the operations carried out by the single operating stations described above and arranged along the production line. Optionally, the control unit 311 is configured for receiving an input signal representative of the correct positioning of the sheet material 200 and/or of the closing film 201 at one or more of said operating stations.
The control unit 311 is further configured for synchronizing the operations of the notching station 305 as a function of at least one parameter representing the relative position between the lower tool and the upper tool 307a, 307b of the packaging station 307, and/or of a parameter representative of an active condition of the upper tool 307a in which the same heats the film portion 201a in engagement on the same tool.
The apparatus 300 comprises only said supplying station, a conveyor 302 configured for moving the finished supports 1 from the supplying station to the packaging station 307, said packaging station 307, a system for feeding a closing film in the form of a continuous web or discrete film portions and, optionally, a continuous closing film cutting station.
| Number | Date | Country | Kind |
|---|---|---|---|
| 102017000148881 | Dec 2017 | IT | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/IB2018/060449 | 12/20/2018 | WO | 00 |
