The invention relates to an apparatus for making objects, in particular containers, by forming a sheet of thermoformable material and for applying a label to the aforesaid containers. The invention further relates to an object, in particular a container, obtained by the aforesaid apparatus. Thermoforming machines are known that are arranged for forming containers from a sheet of thermoformable material comprising a plurality of apparatuses, amongst which a labelling apparatus.
The plurality of apparatuses is arranged in succession along an advancement direction of the sheet. The latter is suitably heated before reaching a forming apparatus, where it is thermoformed by a punch cooperating with a die.
The plurality of apparatuses also comprises in succession a dosing apparatus for filling the thermoformed container with a product and a welding apparatus for welding a covering film to the container such as to seal the container.
Thermoforming machines lastly comprise a shearing apparatus for separating the containers so formed, filled and sealed from the sheet of material.
The labelling apparatus, which includes, for example, a labelling machine of known type, is generally positioned downstream of the forming apparatus or downstream of the welding apparatus and applies by gluing a label to a surface of the container.
A drawback of known thermoforming machines consists of the difficulty of positioning and applying with the necessary precision the labels to the containers, because of the clearances and the imprecision in moving sheet material from one apparatus to another.
Incorrect and/or imprecise positioning of the label can give the container an unattractive appearance.
A further drawback of known machines consists of the presence of residues of glue used to apply the label to the container, for example residues exceeding from the margins of the label, which may dirty the surface of the container and parts and components of the machine. Also in this case, the glue residue compromise the final aesthetic appearance of the container.
Thermoforming machines provided with a labelling apparatus are moreover costly. In particular, in addition to the cost of the labelling apparatus, which may also be very great in proportion to the complexity thereof, the cost of the glue has to be sustained that is necessary for fixing the label to the container.
It should be considered that sometimes forming machines have to be able to form containers provided with an object, such as, for example, a spatula or spoon that the user can use to draw the product from the container, said object being generally interposed between the surface of the container to which the label is applied and the label itself.
As the object is arranged for drawing the product (which is generally a food product), it is necessary for the object not to come into contact with the glue. In order to do so, the glue has to be distributed only in certain peripheral portions.
A drawback of these machines is due to the difficulty of applying the label by effective gluing that however enables the object not to be dirtied with the glue.
An object of the invention is to improve known machines for making objects, for example containers, by forming a sheet of thermoformable material. In particular, one object of the invention is to provide a forming and labelling apparatus that is usable in said thermoforming machines.
A further object of the invention is to provide a forming and labelling apparatus that is simple and cheap and at the same time precise and reliable.
Another object is to provide a forming and labelling apparatus that enables a thermoformed object to be made, in particular a container, that is provided with a pleasing appearance.
Still another object is to provide a forming and labelling apparatus that enables a thermoformed container to be made that is provided with a spatula that is usable for drawing a product contained inside thermoformed container.
According to the invention, an apparatus is provided as defined in claim 1.
According to the invention, an object is provided as defined in claim 12.
The invention can be better understood and implemented with reference to the attached drawings that illustrate an embodiment thereof by way of non-limiting example, in which:
With reference to
The apparatus 1 can be associated with a thermoforming machine, which is not shown, arranged for forming the containers 2 from the sheet 3. In particular, this machine may comprise a plurality of machining stations, amongst which a forming and labelling station with which the apparatus 1 is associated and other stations preceding and subsequent thereto. For example, upstream of the forming station, a station is provided for heating the sheet 3 to high temperatures such as to enable the sheet to be softened and deformed in a plastic manner in the subequent forming and labelling station. Further, downstream of the forming station there can be provided a station for filling the container 2 with a product 5 (shown in
The containers 2 and the labels 4 applied thereto are illustrated in
The containers 2 and the labels 4 are respectively obtained by forming the sheet 3 and by shearing or detaching from a band 6 made, for example, of a thermally activatable material, in particular, a plastic material. Generally, the sheet 3 and the band 6 are unwound from respective reels at stations of the forming machine arranged upstream of the apparatus 1. In particular, the sheet 3 is advanced through the machining stations of the forming machine with which the apparatus 1 is associated according to a first advancement direction indicated in the figures by the arrow A.
The band 6 is in turn advanced through the apparatus 1 according to a second advancement direction indicated in
The apparatus 1 comprises a bell 7 positioned above the sheet 3 and bounding a closed working zone 8, within which the container 2 is formed.
The apparatus 1 comprises forming means 9, 10 and 11 arranged for cooperating together to form the containers 2. In particular, the forming means 9, 10 and 11 comprises a punch 9 configured for cooperating with a die 10 in a shapingly coupled manner. The die 10 is provided with a supporting wall (
The punch 9, arranged in the working zone 8, is movable towards and away from the die 10 and engages with a cavity 13 of the die so as to deform the sheet 3. In particular, the punch 9 is movable towards the die 10 according to the direction defined by the arrow F1 in
The bell 7 further comprises an abutting portion 19 arranged for pressing the sheet 3 and keeping the sheet 3 blocked against the supporting wall 12, in particular during the forming operation. The abutting portion 19, fixed to the remaining part of the bell 7 by fixing elements that are not shown, for example threaded screws, faces the die 10.
The abutting portion 19 is provided with a hole 20 positioned substantially above the cavity 13 and having overall plan-view dimensions that are greater than the cavity 13. The cavity 13 is obtained in the supporting wall 12 and is arranged for receiving a portion 14 of the sheet 3 to be deformed during a forming step in order to obtain the container 2. It should thus be noted that the container 2, which is formed by the apparatus 1, will have a shape and dimensions defined by the cavity 13. The latter comprises an opening facing the sheet 3 of material to be formed, first wall means 16, which forms the bottom wall of the cavity 13, and second wall means 17, in particular side walls, which connects the first wall means 16 to the supporting wall 12. The cavity 13 can have any desired shape, in particular in the embodiment shown in the figures, the cavity 13 has a parallele piped on shape and the second wall means 17 comprises tilted side walls.
In another embodiment, which is not shown, the side walls 17 can be substantially orthogonal to the first wall means 16 and/or to the supporting wall 12.
In alternative embodiments that are not shown, the cavity 13 can have, for example, a frustoconical or cylindrical or prismatic shape in function of the shape that the container 2 to be formed has to have.
The first wall means 16 is movable between a first lowered operating position C1 (shown in
The first wall means 16 is associated with a further punch 22 arranged for separating the label 4 from the band 6, in particular by shearing. In other words, the first wall means 16 forms the operating wall of the further punch 22 facing the cavity 13. The further punch 22 is movable towards the cavity 13 according to the direction defined by the arrow G1 in
The further punch 22 is comprised in a lower part 23 of the apparatus 1 that further includes blocking means 24 that is movable and intended for pressing the band 6 and keeping the band 6 pressed against a lower part of the die 10. The blocking means 24, for example configured as a plate, comprises in particular an abutting wall 26 arranged for supporting and abutting on the band 6.
The blocking means 24 is movable between a respective first operating position D1, shown in
In
In
It should be noted that in order to avoid tearing or lacerating the band 6, the number of cutting means 37 is preferably greater than one so as to start to shear the band simultaneously in several zones; in particular, for example, four blades can be provided that each start to cut the band from a respective zone corresponding to a peripheral portion of the label 4. In this case, the cutting elements will be provided with a set rake angle that enables the cut to be made gradually along the respective cutting line.
In an alternative embodiment of the apparatus, which is not illustrated in the figures, other blades are provided that are associated with the first wall means of the further punch and arranged for cutting said band 6 in cooperation with the cutting means 37 during upward movement.
In another embodiment of the invention, which is not shown, the apparatus 1 can be devoid of the cutting means 37, as the label 4 is already formed on the band 6 entering the apparatus 1, for example being separable from the band 6 by means of intended breakage lines. In this case, the further punch 22, and the first wall means 16 thereof, separate the label 4 from the band 6 during movement from the first operating configuration C1 to the second operating position C2, without performing any band 6 cutting operation. The further punch 22 is moved by elastic means 28, in particular springs, provided with quite high stiffness and which is appropriate for the mass of the lower part 23 to be moved.
It should be further noted that the further punch 22 is provided with a plurality of suction channels 29 that are mutually connected and arranged for creating a vacuum at the first wall means 16 that is able to retain the label 4, once the latter has been cut and separated form the band 6, on the first wall means 16. The suction channels 29, shown by means of a partial section view in
In the configuration of the apparatus 1 shown in
The forming means 9, 10, 11 further comprises pressurised air 11, introduced into the working zone 8, which is hermetically sealed, through a channel 18 obtained in the bell 7 to cooperate with the punch 9 in order to make the portion 14 of the sheet 3 adhere to the wall means 16, 17.
In an alternative embodiment of the invention, which is not shown, the forming means may comprise only one punch that engages in a corresponding die, but not pressurised air.
The die 10 is provided with conduits 21 within which a fluid flows that is suitable for cooling the die 10 and consequently the portion 14 of the sheet 3 deformed within the cavity 13 such as to give appropriate stiffness features to the container 2 once it has been formed.
The apparatus 1 is provided with a control unit, which is not shown, which enables advancement of the sheet 3 and of the band 6 to be controlled and coordinated with the movement of the punch 9 and of the further punch 22. This control unit may coincide, for example, with the control unit of the thermoforming machine with which the apparatus 1 is associated.
In use, the sheet 3 is heated in the heating station, which softens the sheet 3 and places the sheet in the best condition to be compression-formed in the subsequent forming station.
Subsequently, the heated sheet 3 and the band 6 made of a thermally activatable material are advanced by an intermittent indexed motion along respective advancement directions A, B to the apparatus 1.
In non-operating conditions, and anyway whilst the sheet 3 and the band 6 are advancing, the apparatus 1 is arranged according to the configuration shown in
When the sheet 3 is stationary, the die 10 is raised in such a manner as to contact the sheet 3 and keep the sheet 3 pressed against the abutting portion 19 (
Subsequently, the further punch 22, and thus the first wall means 16 are moved from the first operating position C1 to the second operating position C2, whilst the blocking means 24 is moved from the respective first operating position D1 to the respective second operating position D2, shown in
It should further be noted that during upward movement of the first wall means 16 from the first operating position C1 to the second operating position C2, the cutting means 37 shear the band 6 to obtain the label 4. When the first wall means reaches the second operating position C2, the further punch 22 is raised and received inside the chamber 27 in such a manner that the first wall means 16 (on which the label 4 rests and is retained by a vacuum) bounds the cavity 13 in cooperation with the side walls 17.
Still subsequently, the punch 9 starts to lower to reach a position shown in
Once the punch 9 has formed the container 2 and the label 4 has been fixed thereupon, the container 2 is cooled rapidly by the fluid that flows in the conduits 21 of the die, whilst the punch 9 is raised until it returns to the raised position of
As shown better in the enlarged details of
With reference to
The band 6 exiting the apparatus 1 constitutes machining sprue and an opening 30 is visible thereupon that is devoid of material where the cutting means 37 has shorn the band 6 to obtain the corresponding label 4.
On the sheet 3 exiting the apparatus 1 a plurality of formed containers 2 are visible (which are visible in greater detail in
With reference to
In these figures, spatula means 32 is shown that is associated with the band 6, which a user can use to draw a product 5 dosed in the container 2 after thermoforming thereof. The spatula means 32 is already arranged on the band 6 regularly separated from one another by a distance that is substantially the same as that by which the band 6 is advanced at each step. In other words, the spatula means is located in a position that is substantially centred with respect to the label 4 with which it will be associated and which will be obtained by shearing the band 6.
As shown in
Similarly to the label 4, the spatula means 32 is received inside a further recess 42 made in the lower face 40 of the container 2.
In order to grasp the spatula means 32, the user removes the label 4, at least partially, from the lower face 40.
It is important to observe that before use the label 4 completely protects the spatula means 32 from dirt, dust, etc or from any other type of external agent that could make use thereof unhygienic.
With reference to
In
Alternatively, the pre-cuts 33 can define a window 34 or an opening of the label 4 that does not completely cover the spatula means 32, in particular leaves the end of the latter uncovered.
In alternative embodiments that are not shown, the pre-cuts 33 can have any desired shape other than an elliptic shape.
In another embodiment, which is not shown, the pre-cuts 33 can be made at a further end of the spatula means 32 opposite the aforesaid end.
In the version illustrated in
The forming and labelling apparatus 1 according to the invention enables various advantages to be obtained. An advantage of the apparatus 1 is that it enables a forming machine to which it is associated to be cheaper. This is due to the fact that such a machine does not require a labelling apparatus, as occurs on the other hand with machines of known type.
Another advantage of the apparatus 1 is that it is structurally and functionally simple, and thus relatively cheap. Thus the apparatus 1, which combines forming and labelling, is less expensive than the total of the single costs of a known forming apparatus and of a known labelling machine.
A further advantage is that the apparatus 1 enables the label 4 to be positioned precisely and correctly on a lower face 40 of the container 2, as forming the latter and applying the label 4 are substantially simultaneous operations that are performed by the same apparatus 1 without movement of the sheet 3.
Still another advantage of the apparatus 1 is that of forming containers 2, provided with a label 4, provided with a pleasant aesthetic appearance.
This is owing to the fact that the label 4 is no longer in relief with respect to the surface of the known containers 2 but is instead incorporated inside a respective recess 41.
Applying the label 4 to the heated and softened sheet enables the label 4 to be fixed more firmly and effectively compared with the prior art, thus avoiding the using of any type of glue, the use of which increases both the operating costs of the apparatus, and the problems of residues on the containers and on the parts and components of the machine.
Still another advantage of the apparatus 1 is that it is very flexible, it being able to be used without any structural or functional modification even if, in addition to the label 4, it is desired to associate with the container 2 also spatula means 32. Whilst maintaining the aforesaid other advantages, this enables the container 2 to be provided with a means through which the user can remove the product 5 from the inside of the container. The spatula means 32 is hygienic and clean because it is protected before use by the label 4.
Further, the apparatus 1 is able to make different types of pre-cut 33, 133 on the band 6, which enable windows 34 or tabs 134 to be obtained to facilitate the removal of the spatula means 32 by the user.
In versions of the invention that are not shown the apparatus may comprise a plurality of punches, possibly arranged on several rows, provided that they are provided with a corresponding die (provided with a cavity with which the punch engages in a shapingly coupled manner to deform the sheet 3) in a plastic manner, and corresponding further punches for separating the label 4 from the band 6.
In another version, which is not shown, the apparatus 1 can apply labels of any shape and dimensions, also labels of a different shape from the rectangular shape illustrated; the further punch having to be consequently suitably sized and shaped in function of the desired shape and dimensions of the label.
In still another version, which is not shown, the punch 9 can be replaced by other punch means.
In a further version, which is not shown, the further punch 22 can be replaced by further punch means.
In another version, which is not shown, the die 10 can be replaced by other die means 10.
In still another version, which is not shown, the cavity 13 can be replaced by other cavity means.
Variations and/or additions to what has been disclosed and/or shown in the attached drawings are possible.
Number | Date | Country | Kind |
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MO2010A000024 | Feb 2010 | IT | national |
Filing Document | Filing Date | Country | Kind | 371c Date |
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PCT/IB2011/000209 | 2/8/2011 | WO | 00 | 11/5/2012 |