JPH02258566A - Enclosed body of packing vessel - Google Patents

Abstract

PURPOSE: To provide the sealing characteristic resistable to the distortion, and the flow stress resistable to the controllable internal pressure and handling by forming at least a part of a sealing area having a fold exposed to an interior area of a package formed on a peripheral portion, with a flexible material, and having the sealing strength within a range from zero to the strength lower than the sealing strength of a circumferential portion. CONSTITUTION: An external rim 15 of a fold forms a sealing lip portion to a sleeve wall 14. The sealing 16 between the rim 15 and the sleeve 14 is formed by the sufficient sealing pressure. A fold 13 exposed to an interior area of a package has a separatable sealing 22. That is, the sealing 22 is weaker than the sealing 16. When the internal pressure is increased in a container by some reason, the sealing 22 is broken, and a closure 10 having the flexible end is naturally formed as shown by a broken line 23. Accordingly, the pressure is lowered in the container by the increase of the volume, and the sealing can be protected by this structure.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates primarily to closures for packaging containers for pressurized or pressurized filled articles, such as acidic beverages, where the closure provides a relatively thin wall. It also has the advantage of being generally useful for containers. In addition, the closure is of a heat sealable type to provide a suitable sealing pressure within the sealing area.

BACKGROUND OF THE INVENTION The problem behind the invention is to provide a closure having sealing properties that resist strain and an essentially controllable internal pressure and deformation resistance that resists handling.

The problem is also to provide a device that allows the expansion created by the pressure of the volume of the package so that a volume in excess of the nominal fill volume can be taken up.

One of the most important secondary issues is providing a closure that allows sealing with an acceptable counterpressure, which means providing sufficient sealing pressure within the sealing area. .

For example, European Patent Specification No. 0029.039 describes an end closure for a sleeve-shaped packaging container made of relatively thin material. As such, edge closures reinforce the structure of the package, but
The remainder does not provide a solution to the main or secondary problems of the invention.

SUMMARY OF THE INVENTION To obviate such drawbacks, the present invention generally provides at least one panel of relatively thin and flexible material that substantially covers an opening in a packaging container and surrounds the panel. Also provided is a packaging container closure that includes a peripheral portion that can be attached to the edge of the opening. The peripheral portion of the closure 7 includes a sealing area formed in the panel and having a fold exposed to the inner area of the package, said sealing area consisting at least in part of said flexible material. It also has a sealing strength that is between zero and less than the sealing strength to the edges of the peripheral portion.

In one embodiment, the closure forms an end piece of the case of the container in the form of a sleeve, and the sealing region has radially inner and outer rims and extends circumferentially around the panel. Including creases. The radially outer rim of the fold is integral with the lip of the peripheral portion which can be attached to the case of the container.

In said embodiment, if preferred, the radially outer rim forms said lip.

In another embodiment, the lip includes a double layer of flexible material.

In a manner known per se, the lip layers are preferably sealed to each other in order to increase the resistance to deformation.

In a practical embodiment, the sealing strength of the lip skin is greater than the sealing strength of the fold.

In order to ``conceal'' the ``cut'' of the double layer, this layer preferably includes at least a lower portion of the rim and a skirt that is folded around the rim.

The extension of the skirt is an extension which allows at least one edge to fit behind the rim and/or into the wall of the packaging container, if appropriate.

Advantageously, in any of the embodiments described above, the periphery includes a conical region which serves as a part for receiving the obturator.

The peripheral part and/or the panel suitably comprises, at least in the sealing area, a material suitable for induction welding or radio frequency welding or a combination of both.

DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1, the reference numeral 10 relates generally to the closure of the container, which is not partially shown in top view and includes a lid panel 11 and a periphery 12. In FIG. In the illustrated embodiment, the closure 10 is a relatively thin flexible material, for example having a thickness in the range of 10 microns to 200 microns, and coated with a thermoset plastic material, preferably a polyolefin. Manufactured from a laminate containing aluminum foil on one or both sides of it. Other types of materials/combinations of materials, e.g. plastic canopies with suitable additives for the required degree of tightness and/or for the special sealing method! 'i material/plastic film is of course possible.

A sealing area containing foil 13 and extending around panel 11 is formed in the end container and exposed to the interior of the package, and is shown simply as part of sleeve wall 14. In this case, the folds are formed by folding the blank forming the container 10 around its periphery. The fold is on the outer rim 15
, which in this case alone forms a sealing lip against the sleeve wall. Seal 16 between rim and sleeve
is molded with sufficient sealing pressure to obtain an acceptable seal. This pressure can be displaced in the direction of the double arrow 18 and can expand, for example, in the direction of the double arrow 18' and is brought to zero by the support 17 cooperating with the stationary support 19, so that Vl It will be done. The sealing technique used can be, for example, induction welding or high frequency welding, and in this case the end closure 10
The material contains additives which are well suited to the actual welding technique, at least in the welding area. With reasonable embedding, the end closure is generally laminated with metal foil (not clearly shown in FIGS. 1 and 5) along its entire surface. 1st
In the embodiment shown, the seal 16 preferably extends along the entire height of the rim 15 and continuously around the sleeve 14.

To protect the free edge of the rim, cut, lacquer 1
8120. An alternative tape or other protection device is placed along the edge facing the interior of the package.

Alternatively, it is possible to press the edge into the material of the casing 14, as indicated by reference numeral 21 in FIG.

The fold line 13 exposed in the inner area of the package has a seal 22 of the so-called peelable type. Seal 22 is therefore weaker than seal 16.

If for some reason the internal pressure increases within the container, for example due to a pressure increase from the goods placed inside, the seal 22 will rupture (if such a seal exists, i.e. if a seal of greater strength exists). Flexible end closure 10 (cover panel 11
) then assumes a natural shape as indicated by the dashed line 23 in FIG. The pressure decreases within the container due to the increase in volume. The seal is protected by this construction, ie the risk of leakage and destruction of the contents of the package is reduced at the same time. This is because the fold structure allows, in the manner described above, to create an acceptable sealing pressure.

FIG. 2 shows @section 15 including double material layers 15' and 15''
is shown. The layer 15' forms a skirt that is folded and sealed against the rim 15'' to reinforce the end closure. The seal 15'' preferably has the same strength as the seal 16, and for example the height of the rim 15''. The sealing could alternatively also be achieved by a point along the elevated part of the rim.In the same way as before, the crease 13 has a peelable seal 22, which allows the lid panel 11 to be reset to its natural position 23 upon strain exceeding the maximum load.The free edge of the skirt 15' is removed from the interior of the container. 2, the skirt is level with the upper edge of the sleeve 14 and the uppermost portion of the lip 12.

An extension of the skirt 15' according to the dashed line 24 is also possible.

In FIG. 3, edge portion 12 is located at a location below the top edge of sleeve 14. In FIG. Such a position means that the lid panel 11 is protected in its natural position by the sleeve 14 and/or skirt 15'.

In FIG. 4, the skirt 15' is short (also the peripheral part 12
shows one form of end closure in which the upper part of the rim 15'' of the sleeve 14 is sealed against the sleeve 14.
6 forms the actual seal of the end closure 10. There is a peelable seal 22 in the fold line 13 exposed to the inner area of the package in the same way as before.

In FIG. 5, a conical peripheral portion 12 is shown to facilitate the insertion of the obturator. The peripheral rim 15 is formed from a scroll 25 according to FIG.
covered by Such scrolls are perforated from truncated to trapezoidal to provide essentially smooth sealing areas.

Although the end closures of these embodiments are manufactured from a flexible, collapsible material, other processing techniques, such as injection molding, may be used as an alternative to the production of the parts, such as the periphery of the end closure. It is recommended that it be used as an item.

FIG. 7 shows an embodiment in which the lid panel 11 comprises a relatively thick material and is, for example, injection molded and then laminated with aluminum foil 11' or the like. The idea is to provide an open edge on which the double layer 12 or closure, which can be pressed together and pressed against the wall of the sleeve, is placed. Pressing together is achieved, for example, by pressing the panels 11 in the direction of the arrow inside the container, while the rim 15 is prohibited from entering the sleeve.

Such an I13 controlled pressing operation is carried out by increasing the dimensions of the bilayer relative to the aperture, at least in certain regions of the bilayer, i.e. by enlarging the dimensions of the bilayer at least in certain regions of the bilayer, i.e. said bilayer having a frusto-conical shape as in FIG. It would be obtained by forming .

Figure 9 shows the effect of pressure on the interlayers and sleeve together after folding. Often, a vacuum will not occur, but it is shown in FIG. 9 for illustrative purposes as the result obtained by applying controlled pressure to the weld area.

FIG. 10 shows a pressure-tight closure obtained by oversizing the foil/sealing label 11' relative to the opening in the sleeve 14. When pressure or strain occurs in the weld 16, the strain is transferred by the relatively stiff rim 15, i.e. the advantageous “strain” in the weld area (as opposed to strain along the peripheral line). line load” (along the direction of height).

Further increased strain resistance is possible with the two-part closure of FIG. 11, which includes a separate panel 11 and a separate peripheral portion 12.

[Brief explanation of drawings]

1 shows a first embodiment of a container end closure partially in section with part of the container wall; FIG. 2 shows a first embodiment of the container end closure; FIG.
FIG. 3 shows a third embodiment of a container end closure partially in section with a portion of the container wall; FIG. Figure 4 shown in
The figure shows a fourth embodiment of the end closure of a container, partially in section, together with part of the container wall, and FIG. FIG. 6 shows the closure in partial section; FIG. , FIG. 7 shows an injection molded closure with four laminated foils, FIG. 8 shows a closure with a conical double rim, and FIG. 9 shows the closure in the sealed state. Figures 10 and 11 show an injection molded closure with an oversized closure label and Figure 11 an injection molded closure consisting of two parts and an oversized closure label. It is a figure without an obstruction body. In the figure, 10... Closing body of packaging container, 11... Panel, 1
2... Peripheral part, 14... Container sleeve wall, 15.
...Rim, 16...Sealing, 22...Sealing.

Claims (16)

[Claims] (1) A packaging container comprising at least one panel made of a relatively thin and flexible material for substantially covering an opening of the packaging container, and a peripheral portion surrounding the panel and attachable to the edge of the opening. In the closure of, said peripheral portion includes a sealing region having a fold formed thereon and exposed to an interior region of the wrapper, said sealing region at least partially consisting of a flexible material and said opening A closure for a packaging container, characterized in that it has a sealing strength in the range from zero to a sealing strength lower than the sealing strength of the peripheral portion. (2) A closure according to claim 1, wherein the closure includes an end piece (10) for a casing of a sleeve-shaped container.
comprising a fold (13) extending around said panel having radially inner and outer rims, said radially outer rim of said fold being said radially outer rim of said panel attachable to said casing; A closure for a packaging container, characterized in that the closure is integrated with a lip in a peripheral portion of the closure. (3) In the closure body according to claim 2,
A closure for a packaging container, characterized in that the radially outer rim forms the lip. (4) In the closure body according to claim 2,
A closure for a packaging container, characterized in that the lip includes a double layer of flexible material. (5) In the closure body according to claim 4,
A closure for a packaging container, characterized in that the lip layers are sealed together. (6) In the closure body according to claim 5,
A closure for a packaging container, characterized in that the interlayer strength of the lip is greater than the sealing strength of the fold (12). (7) In the closure according to any one or any of claims 4 to 6, the double layer includes at least a lower portion of the rim and a portion of the rim. A closure for a packaging container, characterized in that it includes a skirt that is folded around. (8) In the closure body according to claim 7,
Closure of a packaging container, characterized in that the extension of the skirt is concealed at least at its edge behind the rim and/or in the wall of the packaging container. (9) The closure according to any one of claims 1 to 8, characterized in that the peripheral portion includes a conical portion formed as a portion into which the closure is placed. packaging container closure. (10) The closure according to any one of claims 1 to 9, wherein the peripheral portion and/or the panel are induction-welded at least within the sealing area. /A closure for a packaging container, characterized in that it contains a material suitable for high-frequency welding. (11) A packaging container closure comprising at least one element substantially covering an opening in the packaging container and a peripheral portion surrounding said element and attachable to the edge of said opening, said peripheral portion A closure for a packaging container, characterized in that it is formed as a double layer pressed together and arranged to be pressed by the edge of the opening against said edge. (12) A closure for a packaging container according to claim 11, wherein the double layer includes a substantially frustoconical envelope surface. (13) In the closure according to claim 12, the peripheral portion, at least in its sealing area, is a metal foil or a metal foil arranged for induction welding and/or high frequency welding. A closure for a packaging container, characterized in that it is laminated together with corresponding materials. (14) A closure for a packaging container comprising at least one element substantially covering an opening in the packaging container and a peripheral portion surrounding the element and attachable to the edge of the opening; A closure for a packaging container, characterized in that it comprises a flexible material having dimensions larger than that of a flexible material, at least a part of which is arranged to abut said peripheral part and/or said element. 15. A closure for packaging containers according to claim 14, characterized in that the element covering the opening can be placed into the peripheral part by a snapping action. 16. A packaging container closure according to claim 14, wherein said panel is positioned to receive flexible material without stretching.