Present invention relates to a package closure according to the type mentioned in the preamble to claim 1.
The invention is preferably applied to flexible packages of the type milk, juice or yoghurt packages, but can naturally also be used on rigid and/or shape stable packages.
Present packages, provided with caps/closures of known technique, have a number of disadvantages which are eliminated by the present invention and the main advantages of this invention are:
These above mentioned advantages with the new construction are realized according to the invention by that the construction according to the type stated in the preamble is primarily realized in a way that is stated in the characteristic part of claim 1.
Additional characteristics and advantages of the invention is evident from the following description with reference to the accompanying drawings showing a preferred, but not limiting embodiment of a package closure, realized with a cap and a package neck. In the description the invention is mounted in constructions that only are an example of an embodiment of forms of execution of the invention.
The primary part of the invention is the design of the sealing parts between cap and package neck and that those parts always can be sterilized after that they are assembled, or even in that case when the neck of the package constitute a continuous, or by manufacturing of a part belonging to the package in the complete package itself, and that the package tighten and also prevents air from penetrating into the package in those cases when an over or under pressure would occur in the package.
In the now showed and described embodiment's represents in detail:
The cap in the different alternative embodiments has a number of new characteristics which are common and according to the following.
Thus, the cap has an exterior surface provided with grooves 21, partly to improve the grip and partly to obtain shape stability with minimal overall thickness of material or use of material in the cap. The exterior surface preferably has a slightly growing diameter in a shoulder part 26 extending from a ring shaped upper plane 27 and from which the vertical grooves 21 starts. The slightly growing diameter changes over to a lower cylindrical part 22 constituting the termination downwards at the cap.
Internally the cap, in the first alternative embodiment, has in its upper part, an inner ring section 24, which begins at the internal upper surface of the cap. This ring section has an extension perpendicular to the interior upper surface 28 which preferably is 1-3 mm. The ring section 24 has an outer wall 32 whose diameter is selected to cooperate with a sealing lip 10 provided on the neck 2. On the outer wall a groove 49 is provided, which preferably constitute a segment of a circle with a bow height of 0.1 mm or a V-groove or similar. This groove is located in a way that it cooperates with a sealing tip 48 of a sealing lip 10 at the neck, when the cap is mounted on the neck.
Outside the upper surface 28—seen in radial direction—there is a plane 30. The plane 30 is not horizontal but is inclined relative the horizontal plane with approximately 5-45°, and preferably 15-30°, and with its lowest point at an outer edge 29 of the plane 30, and this is a construction detail of the present invention, which, since the plane 30 is inclined relative the horizontal plane, gives a reinforcement of the sealing function of the closure of the package. The sealing function is later in this description described more in detail.
The plane 30 and its outer edge 29 change over directly to an inner section 35 of a radius, with a radius cooperating with an outer part 8 of the neck 2, in a way that when the cap is mounted on the neck, the inner section 35 of the radius encloses the upper, outer part 8 of the neck, which has a corresponding exterior rounded section 37. The section 35 of the radius changes in the lower part over to an inner cylindrical section 33 which in its prolongation extends downwards to that part which has its interior threaded part.
In the plane 30 there is also a recess 39 located on an approved distance outwards from the interior corner 31 of the plane 30. This recess is according to dimensions and position coordinated with a heel 38—see FIG. 4:2—in the upper part of the neck 2, where this heel 38 protrude over the upper plane36 of the neck.
These both parts, the recess 39 and the heel 38 gives the construction a increased locking effect between the cap 1 and the neck 2, which means that those parts are radial coupled and accordingly their mutual position are fixed and this also in those cases of operation when the complete package is subjected to variations in temperature and pressure.
The cap is realized with interior threads cooperating with threads on the neck. These threads are not special for the present closure of a package, and therefore they are not described in detail.
The cap has an inner locking edge 23 below and where this locking edge in its upper part has a horizontal plane 25, directed into the center of the package and when the cap is mounted on the neck 2 this plane 25 snaps over an cooperating, exterior ring shaped plane 9 on the underside of a swelling 11 located on the neck 2. To open the package an increased opening moment will be needed and this owing to the cooperation which occurs between cap and neck and the cooperating planes 9 and 25. When the cap is opened the cooperating planes 9 and 25 loses their engagement. A common embodiment of a cap is that it is realized with an anti-tamper seal relative the neck. This alternative applies with advantage also in this construction, but this is not described in more detail in this application, since it is an embodiment which occurs in several packages and in several embodiments.
A second alternative embodiment of the cap 1 is evident from
The difference between the cap according to the first alternative embodiment=
A third alternative embodiment of the cap 1 is evident from
The difference between the cap according to this alternative compared to the alternative embodiments 1 and 2 is only that the plane 30, at the outer edge 29 of this plane, now changes over directly to the cylindrical section 33, which is directed downwards to the lower threaded part of the cap. Thus the cap according to this alternative embodiment has no recess 39 or cylindrical section 35 of radius made or carried out in the plane 30. This third alternative embodiment of the cap 1 will cooperate with a neck realized according to
The neck 2 in this first embodiment preferably has a rotational symmetric design and its dimensions is natural coordinated with which that cap which it cooperate. In its lower part the neck has a thin walled section, a skirt 6, which preferably is welded to the package, on which the neck has to be mounted.
In an alternative embodiment of the invention the neck is a part of the complete package, but in this description it is provided that the neck is a separate detail according to
At the top the neck, according to FIG. 4:2, has a cylindrical part 44 which changes over to an exterior cylindrical part 8 that in its diameter is larger than the part 44 and where the part 8 is coordinated with the cap 1 and its outer section 35 of the radius. The outer part 8 has outwards a section 37 of the radius which means that the cap and the neck will assume a cooperating position where those both sections of the radius will be situated close to each other.
The neck is upwards limited by a plane 36 which in its outer periphery changes over to the section 37 of the radius. From the plane 36 a heel protrudes upwards. The dimension of this heel and its radial position is cooperated with the cap and its recess 39.
From the plane 36 the sealing lip 10 is emanating, with a surface 40 directed inwards to the center of the neck and down to the bottom of the neck in an angle of preferably 45° in relation to the horizontal plane. The surface 40 constitute the upper part of the surface of the sealing lip 10. The sealing lip has a length cooperating with the design of the cap, in a way that when the cap is mounted the sealing lip will be in contact with the outer wall 32 of the ring section 24 of the cap. The part 40 of the surface changes over to the lover part 46 of the surface slightly angled away, ca. 1-10° and preferably 5° downwards to the package, in relation to the part 46 of the surface. In the changeover between the part 40 of the surface and the part 46 of the surface there is a breaking edge 47, where the breaking edge has a nose or a swelling, alternative a sealing tip 48, which will give a improved sealing function of the complete sealing lip in relation to the cooperating inner ring section 24 and its outer wall 32 of the cap.
To further improve the tightness preferably the ring section 24 and its outer wall 32 has a design with a groove 49, which means that the breaking edge 47 and its sealing tip 48, when the cap is mounted on the neck 2, will assume a position implying that the sealing tip 48 is pressed into this groove 49—see FIG. 7:2 and its view in detail. Accordingly the sealing tip will assume e position which implies that it is engaged with the groove 49 and that with a pressure, since the whole sealing lip 10 is forced away from its neutral position when the cap is mounted and has therefore an interior stress, which means that a sealing force is provided and those parts of the force is taken up of the sealing tip in its contact with the groove 49 in the outer wall 32. Even in those operating cases when the temperature and pressure levels vary in the package the sealing tip 48 will be positioned in its cooperating groove 49 and consequently a certain locking between the cap and the neck is obtained in this sealing point.
The lower part 46 of the surface of the lip 10 is in the final mounting position also situated in direct contact with the outer wall 32. That the lip 10 and the part 46 of the surface is inclined downwards to the package 7 and that a sealing force is provided followed by the bias of the lip 10 and its part 46 of the surface against the cooperating outer wall 32 of the cap, is of vital importance for a satisfactory sealing function. A tightness which is build up from even contact surfaces between the cooperating parts of the cap and the neck in the package doesn't give a satisfactory function in all operating positions.
The sealing lip 46 is relatively stiff and its lower or bottom side 42—see FIG. 4:2—runs more or less in parallel with the surface 40 back upwards and changes over via a section 43 of the radius to the interior interface of the neck of the cylindrical part 44.
A second embodiment of the neck 2 is evident from
The design of the upper part of the neck 2 differs in this second embodiment from the first embodiment according to the following.
According to FIG. 5:2 the neck has a cylindrical part 44 which on the top changes over to an outer cylindrical part 8, whose diameter is larger than the part 44 and where the part 8 cooperates with the cap and its inner section 35 of the radius. The outer part 8 has outwards a section 37 of the radius which means that the cap and the neck will take up a cooperating position, where those both sections of the radius will be situated close to each other. In diameter and radius the part 44 and the outer part 8 with its section 37 of the radius preferably are equal in the first and second alternative embodiment of the neck.
The neck is upwards limited of a plane 36, which in its otter periphery changes over to the section 37 of the radius.
Starting from the plane 36 a, preferably horizontal, sealing lip 10 extends, with a surface 40 directed into the center of the neck. The surface 40 constitute the upper part of the surface of the sealing lip 10. The length of the sealing lip is coordinated with the design of the cap, in a way that when the cap is mounted—see FIG. 8—the sealing lip will be situated in a clamped position and presses against the outer wall 32 of the ring section 24 of the cap 1. In this clamped position the sealing lip will be directed downwards to the package with an angle which is 15-65° in relation to the horizontal plane, and preferably with the angle 30-45°.
The sealing lip is provided with a sealing tip 48, preferably situated ca. 0.1-1.0 mm from the outer end of the sealing lip and the sealing tip is situated slightly—ca. 0.1 mm—above the plane 36. At the interior interface of the cylindrical part 44 there is on the top a section 43 of the radius comprising a nearly 180° segment of a circle and where the section of the radius changes over to a lower surface 42 of the sealing lip 10. When the sealing lip is subjected to a force down from in its outer part, at the sealing tip 48, the sealing lip will yield downwards and thereby be bent at the section 43 of the radius. The stiffness of the sealing lip varies according to the requirements which are set by the present package, the range of application, and examples of controlling parameters for the stiffness is the section 43 of the radius and the size of this radius as well as the remaining material thickness from the section of the radius up to the upper plan 36 of the sealing lip as well as the choice of material in the neck.
A third alternative embodiment of the neck 2 is evident from
In this third alternative embodiment the upper part of the neck is altered in the way that to the foregoing alternative embodiment now also a second sealing lip 51 is introduced situated in the same upper plane as the sealing lip 10 but directed straight outwards from the center of the neck, i.e. in opposite direction towards the sealing lip 10. This sealing lip 51 preferably has the same principal design as the sealing lip 10, but the design can of course vary within the scope of the invention. In FIG. 6:1 the sealing lip 51 has a design with a sealing tip 52 in its outer end and with a more or less parallel underside 54 in relation to the upper plane 36 and where this underside in its inner part, with a section 53 of the radius, changes over to the downwards directed section 44.
By designing the neck 2 with sealing lips both outwards and inwards in relation to the center of the neck, sealing element against the cap 1 and its cooperating surfaces are created, which means that the cap tightens in those cases of operation when an overpressure as well as an under pressure is established in the package.
By an overpressure in the packaging it is the sealing lip 10 that tightens against the inner section 24 of the ring of the cap and this irrespective of which alternative embodiment of the neck 2 or the cap 1 is available.
By an under pressure in the package the sealing lip 51 guarantees that no air can flow into the package since the sealing lip 51 in this case will be pressed more harder upwards and out against the interior surface, the cylindrical section 33 of the cap 1. This is illustrated in
Additional examples of how the upper part of the neck 2 is designed and this in the scoop of the invention is evident from FIG. 6:2 and FIG. 6:3.
Those figures show examples of alternative forms of embodiments of the neck 2 and its upper part. In FIG. 6:2 the neck is provided with the radial outwards directed sealing lip 51, realized according to the above description, while the sealing lip 10 is completely omitted.
In FIG. 6:3 the neck 2 has a combined sealing according to the former descriptions. Thus the neck in this alternative has a sealing lip 10 designed according to the alternative embodiment 1 of the neck 2 and the sealing lip 10 is in this case combinated with the sealing lip 51 according to FIG. 6:1 above.
FIG. 6:2 points out an alternative embodiment which is suitable in those cases of operation when the demands for function only require a limited sealing effect.
FIG. 6:3 is in function equivalent with the embodiment according to FIG. 6:1.
In order to further clarify the invention different combinations is showed in
In the detail view the cap has come to that position where it is completely mounted. In this position the upper plane 30 of the cap and its outer edge 29, which is the section of the cap which at first will be in contact with the upper plane 36 of the neck, has pressed the outer part 8 downwards and thereby urged this outer section slightly down against the package 7. At this changing of position a rotational movement occurs at the top section of the neck which means that the sealing lip 10 and its lower partial surface 46 will be moved inwards and upwards to the center of the package and to a new position where the sealing lip and the contact surfaces will be pressed against the cap and its cooperating part, the outer wall 32 of the ring section 24. In this position a contact pressure is obtained between the parts of the cap and the neck which means that even if the package is influenced, from for instance variations in temperatures, it still exist a tightness between cap and neck. Because the sealing lip is inclined with ca. 45°, in relation to the horizontal plane and also downwards to the cooperating sealing surface on the cap, the contact pressure which exists between those parts by closed cap will be increased in those cases when the interior overpressure in the package arises or increases during for instance the period of storage. Accordingly an enhanced interior overpressure in the package brings about that the tightness between neck and cap is improved and this thanks to the constructive design of the sealing parts. A main requirement is that even if the pressure or the temperature is altered in the complete package, the contact pressure that is provided between the sealing lip 10 and the surface 32, in cooperation with the fixation which exists in the upper part of the neck between the construction details and in that case foremost the heel 38 and the recess 39 provided on the neck and the cap, secure that the cooperating surfaces will not be displaced in relation to each other.
In FIG. 8:1 the cap is only mounted to a position where the ring section 24 is come down to the lip 10 of the neck 2. The length of the lip is selected in a way that it by its continuing mounting of the cap—see FIG. 8:2—will be pressed down in direction to the package. By selecting approved connections between requirements of tightness and dimensions of the cooperating parts—in the first place the length of the lip 10 and the distance to and the length of the inner ring section 24—a satisfactory tightness is obtained also in that case when the cap isn't mounted to its final position. Already when the lip 10 has began to engage the outer wall 32 a fully tightness is obtained, i.e. the package has already in this mounting position a fluid tightness, which is an advantage. The cap can after that be moved—be threaded additional 0.5-1.0 turns—down to the final mounting position according to FIG. 8:2.
In FIG. 9:1 the cap is only mounted to a position where the ring section 24 of the cap not yet has get down to the lip 10 at the neck 2. The length of the lip is selected in a way that it by the further mounting of the cap will be pressed further downwards to the package. Also in this case the dimensions of the cooperating parts—the length of the lip 10 and the distance to and the length of the inner ring section 24, the length of the lip 51 as well as the distance to the cooperating cylindrical section 33—which is crucial for obtaining a fully tightness when the cap is in its final mounting position according to FIG. 9:2.
In FIG. 10:1 the cap 1 is only mounted to that position where the both sealing lips 10 and 51 respectively of the neck 2 is in contact with the cap and with its inner ring section 24 and cylindrical section 33 respectively. In this position the anti-tamper seal 55 has reached down to the lip 56, but not yet been snapped over the same.
In FIG. 10:2 the cap 1 is mounted to its final position on the neck 2. In this position the anti-tamper seal 55 is snapped over the lip 56 and in this position the lip 56 is resilient pressed outwards to the corner 5 of the plane 57 of the anti-tamper seal. In this position the cap cannot be dismounted without breaking off the anti-tamper-sealing.
With a design where the anti-tamper seal is located underneath the opening inwards to the package the risks that today exist with some anti-tamper seal are eliminated. The present design brings about that the anti-tamper seal, also after it is broken, still is fixed, or remains hanging, on the neck and in that case underneath the lip 56. This means that the anti-tamper seal not falls away from the neck and for instance falls down into a drinking vessel or into a glass. With that the risks which exists by some of the present anti-tamper solutions is avoided.
The tightness of the cooperating parts of the neck and cap is completely crucial for the quality of the package with respect to the capability to maintain a desired cleanness or environment in the package and this during a long time, at varying storage temperatures or other varying outer factors. The whole construction is realized to manage the variations that occur by the fabrication of components like caps. This means that this new present construction permit that the process window, i.e. the process security, which is dependant of material quality, colors, manufacturing tolerances, process data etc. can be slightly widen, which means lower manufacturing costs and this with maintained secured function in the complete package.
Moreover packages usually require some form of sterilizing after that the cap is mounted on the neck. How this is done isn't primary for the construction. Important is that the constructive design of the neck or the cap, which must be realized in a way that the quality of the filled up package always is secured during the whole working life of the package.
Depending on which application the closure of the package shall be mounted, there are different requirements of the function. To manage those different requirements the neck and the cap is designed in a way that for instance different contact pressures between the sealing lip and the neck is obtained. This is possible by varying the measure “a”—see FIG. 4:2 and/or FIG. 5:2—alternative by making the sealing lip varying stiff and/or varying long.
Additional advantage by the new alternative constructions is that the package is reclosable, i.e. that it always gives a fully tightness, a tightness which is the same as in the initial phase and this thanks the interior resilience and the sealing force which always is obtained when the cap is mounted on the package.
Also the axial and radial locking which is given by the construction between the cap and the package, gives en totally new function compared to existing caps.
At the final mounting position of the cap and when the neck is applied on the package the complete package has a design which gives conditions for a complete sterilizing, normally an UV-treatment, and this without causing any blocked parts by the sterilizing treatment. In the final mounting position also the cooperating planes 9 and 25 are engages, which means that it requires a certain increased starting moment by opening the package. The magnitude of this moment of opening can be chosen according to the requirements provided in the individual case.
Number | Date | Country | Kind |
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0801018-3 | May 2008 | SE | national |
Filing Document | Filing Date | Country | Kind | 371c Date |
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PCT/SE09/00226 | 5/4/2009 | WO | 00 | 4/20/2011 |