WO1983000677A1

WO1983000677A1 - Package with gas-tight envelope

Info

Publication number: WO1983000677A1
Application number: PCT/AT1982/000024
Authority: WO
Inventors: Brüder Teich Aktiengesellschaft Folienwalzwerk
Original assignee: Jud, Wilfried
Priority date: 1981-08-21
Filing date: 1982-08-23
Publication date: 1983-03-03
Also published as: DE3276232D1; IT1152032B; US4811848A; EP0086214B1; ATE26953T1; AU8828182A; EP0086214A1; IT8222923A0

Abstract

The package made of a particularly flexible plane material, comprises a gas-tight envelope and a tearing strip delimited by scored lines or weakened areas (3, 13, 23) wherein the package material is connected to a cover element (5, 15, 25) of preferably plane material. The top surface (6, 16, 26) of the cover element (5, 15, 25), connected in a plane relationship with the package material, has a closed periphery (7, 17, 27) which surrounds completely the scored lines (3, 13, 23) without touching them. Upon pulling the cover element (5, 15, 25) forming the beginning of the tearing strip, the package material is torn from both ends of the scored lines or weakened areas (3, 13, 23) and along the lines delimiting a tearing area (4, 14, 24). Additional weakened lines (2, 12) may be provided at the locations where the package material is intended to be torn. Package materials with two layers without weakened areas (2, 12) but with a reproducible tearing, are preferably comprised with an inner support layer and with a gas-tight outer layer having most often a reduced thickness.

Description

Pack with a gas-tight packing envelope.

Technical field;

The invention relates to a pack with a gas-tight packing envelope, consisting of a flat, in particular flexible packaging material and a tear-open element, which is intended to be touched when the package is opened at the beginning and to be pulled in a predetermined tear-open direction, the packaging material being at the edge a strip or flap-shaped tear on tear area.

State of the art;

A pack of this type is known from the published PCT application WO 80/02827 (application no. PCT / AT 80/00017) by the applicant. In this known package, which is advantageously produced from a two-layer packaging material and / or is designed as a tubular bag package, the lateral edges of the tear-open area are formed by lines of weakness in the packaging material, along which the material tears when the package is opened. The beginning of the strip-like tear-open aid here lies in a doubling area of the packaging material, in the case of a tubular bag pack, for example, on one of its fin-shaped sealing parts. By means of weakening lines arranged in a special way on the packaging material in the said doubling area, an unproblematic actuation of the tear-open member is made possible while maintaining the gas tightness of the packing envelope. In the case of the pack with gas-tight packing envelope described in the above-mentioned PCT application, the tear organ start is due to a Ver Packing material duplication area, for example on the fins of a tubular bag pack formed by sealing seams. Of course, this is a restriction for the arrangement or for the formation of the tear-open element.

Representation of the invention;

The object on which the invention is based is achieved in the pack according to the invention, which is characterized in that the packaging material has a line-shaped punching or a weakening line piece at the beginning of the tear-open area and that in the area of this punching or weakening line piece the packaging material is detachably flat with one, preferably Covering element made of a flat material is preferably connected by a binder layer, the surface area of which is connected to the packaging material and has a self-contained outer contour, which completely surrounds the punching or the weakening line piece, but does not touch it in the process.

When opening the package, one grips the cover element forming the start of the tear-open element and pulls it off in the tear-open direction. The packaging material tears - starting from the two ends of the punching or the weakened line piece - on the lateral edge of the tear-open area.

According to an advantageous embodiment of the pack according to the invention, additional weakening lines are provided in the packaging material, starting from the ends of the punching or the weakening line piece form a border on both sides of the tear-open area along which the packaging material tears when the package is opened.

According to an advantageous embodiment of the package according to the invention, the cover element comes to rest on the outer envelope of the package envelope and the minimum distance of the outer contour of the surface area of the cover surface connected to the packaging material from the punching or the weakening lines in the packaging material is at least 1 mm, but preferably at least 5 mm. The cover element consisting of a flat material can advantageously have a partial area that is not directly connected to the packaging material and that forms a removable tab.

According to another advantageous embodiment of the pack according to the invention, the cover element consisting of a flat material comes to lie on the inside of the packaging sleeve and the surface area of the cover element which is connected flatly to the packaging material has, in addition to its outer contour, a self-contained inner contour, the minimum distance from which outer contour is at least 1 mm, but preferably at least 5 mm, and which at the beginning of the tear-open area does not cross the line-shaped punching or the weakening lines or only crosses at two points, so that a lifting-off of packaging material lapses at the start of the tear-open area.

In a further advantageous embodiment of the pack according to the invention, which at least approximates one has a ma- or cylindrical-shaped packing envelope area, the cover element consisting of a flat material is arranged within this packing envelope area and this area is covered by a sleeve-shaped loop made of flat material. The sleeve-shaped loop can advantageously form the cover again at the same time in the area of the punching or the weakened line piece.

According to advantageous embodiments of the invention, the package according to the invention can be formed from a plastic monofilm, from paper, or from an aluminum foil.

According to another advantageous embodiment of the invention, the packaging material is produced as a composite material from at least two different layers of sheet-like flat material, one of which serves mainly as a carrier layer and the other mainly as a gas-tight layer. In this case, if no additional lines of weakness are provided for the lateral delimitation of the tear-open area, the carrier layer in the pack advantageously faces the packaged goods. The carrier layer can advantageously be made from a paper web or a plastic film, while the gas-tight layer can advantageously consist of an aluminum foil or a plastic film.

Brief description of the drawings

For the packs described with reference to FIGS. 1 and 2, for example, a multilayer packaging material is assumed, one of which lies on the outside of the pack Coming carrier layer from a driven Kraftpa pier a grammage of 50 - 70 g / m ² , a 0.009 mm thick aluminum foil laminated to this as a gas-tight layer and then has a sealing medium layer. Depending on the type of sealing to be carried out, the sealing medium layer advantageously consists of a heat-sealing medium, such as a PE or PVDC or hot-melt coating with a thickness of 0.02 to 0.06 mm or a cold adhesive coating based on latex with an application of 2-7 g / m ² (solid).

Fig. 1 shows a perspective view of a tubular bag pack 1 whose packaging material has two weakening lines 2, which are connected at their ends by a line-shaped punching 3 attached in the packaging material, such that these weakening lines 2 and the punching 3 limit a tear-open area 4.

In the area of this punching, the packaging material is releasably glued to a surface covering element 5 (which is shown in FIG. 1 with an excessively large thickness for clarity) over an area 6 of the covering element surface, the outer contour 7 of this surface area 6 being punched through 3 completely encloses, but does not touch them. Through the cover 5, the punch 3, which has an opening in the. Packaging material represents, sealed gas-tight. In order to achieve sufficient gas tightness, the minimum distance of the contour 7 from the punching 3 is about 5 mm. The cover element 5, which can advantageously be an adhesive label, for example, is also on an edge region 8, which lies opposite the running lines of weakness not glued to the packaging material.

When the package is torn open, the cover element 5 is gripped at its edge area 8 and first pulled off from the packaging material in the direction of arrow 9 and then guided along the tear area 4. The cover element 5 does not detach from the opening area 10, so that the package is opened in the usual way by tearing the lines of weakness 2. As a result of the U-shaped punching 3, there is no greater resistance to the pulling off of the tearing area 4 during the tearing process and the tearing of the packaging material on its weakening lines 2 can be carried out quickly and with little effort.

In some cases, however, instead of the line-shaped punching that connects the two weakening lines 2, a piece of weakening line that is realized in particular by punching can be provided. It is important that the adhesion of the flat connection with which the cover element is connected to the start of the tear strip is large enough to the force required to tear the packaging material on the weakening line pieces connecting the two weakening lines 2 transfer. Since no punching is provided in these pack variants, the cover element loses its sealing function and it is sufficient if the cover element is connected to the packaging material only at the beginning of the tear-open area.

FIG. 2 shows a tubular bag pack 11 which, like the pack according to FIG. 1, has a tear-open area 14 which is delimited by weakening lines 12 and a punching 13 connecting these weakening lines. At the This packaging variant is now a flat cover element 15 glued in the punched area 13 on the inside of the packaging material. The surface area 16 of the cover element 15, which is connected to the packaging material in a flat manner in this way, is window-shaped, ie it has, in addition to an outer contour 17, an inner contour 18 which delimits the window opening, within which the covering element 15 is not glued to the packaging material. The minimum distance of this inner contour 18 from the outer contour 17 is about 5 mm. Through the cover element 15, the opening formed by the punching 13 in the packaging material is now closed in a gas-tight manner in a similar manner to the packing according to FIG. 1. Since the cover element 15 in the present punching according to FIG. 2 is not glued to the packaging material in the area of the punching 13, the opening area 20 forms a packaging material which can be easily lifted off.

When the package is torn open, the tear-open area 14 is grasped at its start 20 and pulled off in the direction of arrow 19, tearing the lines of weakness 12 and detaching it from the cover element 15 attached to the inside of the packaging material.

On the two described with reference to Figures 1 and 2

Packing variants each take up a relatively large part of the front surface of the pack.

In order to cover these tear-open aids for aesthetic reasons or to protect against any mechanical damage, the prism-shaped envelope area of these packs can be used partially with a subsequently attached sleeve-shaped loop made of flat material, such as paper. The outer packaging of the pack is then attached to this loop, unaffected by the design of the tear-open aid. 1, the sleeve-shaped loop can advantageously also be designed in such a way that it forms the cover element at the same time.

It has been shown that the tear-open member of the package according to the invention in many cases also functions in a reproducible manner if the tear-open area is not laterally limited by lines of weakness. In these cases, the packaging material tears from the two ends of the punching along two substantially parallel or slightly converging or slightly divergent lines. This is e.g. the case when the packaging material consists of certain single-layer materials such as paper, a biaxially oriented polypropylene (OPP) or an aluminum foil. When using multi-layer packaging materials, as they are preferably used to build gas-tight packs, such as tubular bag packs, there is a differentiated tear behavior.

In the case of packaging materials that have a carrier layer and a gas-tight layer made of a homogeneous, gas-tight, but easily tearable material, which layers are formed during the production by sheet-like layers, it is usually shown - especially when the packs are torn open quickly only then a well reproducing, not too divergent or wedge-shaped tearing of the ver packing material, if the carrier material faces the packaged goods.

Such packaging material, which has a three-layer structure, consists, for example - from the outside of the pack - of a 0.012 to 0.020 mm thick film made of biaxially stretched polypropylene (OPP), a 0.009 mm thick aluminum film, a kraft paper with a grammage of 40 - 60 g / m ² and a cold adhesive coating based on latex (2 - 7 g / m ² solid).

3 shows a perspective view of e.g. Pack according to the invention produced with such a packaging material and designed as a tubular bag pack, in which no lines of weakness are provided.

The packaging material here has a U-shaped punching 33, which is closed again with a partially coated with adhesive label as a cover element 25. The outer contour 27 of the adhesive area 26 of the cover element 25 completely surrounds the punched hole 23 without, however, touching it. The cover element 25 also has an edge region 28 with which it is not connected to the packaging material.

When the package is torn open, the cover element 25 is gripped and pulled off in the direction of the arrow 29. The packaging material tears along two lines running approximately parallel to one another and delimiting the tear-open area 24 on both sides. Fig. 4 shows the pack during the tear process in a partial view in section. If, on the other hand, a packaging according to FIGS. 3 and 4 is used, a packaging material which - from the outside inwards - contains an OPP film, a kraft paper, an aluminum foil and finally the cold adhesive coating (in each case, for example, in the individual thicknesses as indicated in connection with FIG. 3), the tearing lines run together in a wedge shape, in particular when the package is torn open quickly, so that no opening that can be used to remove packaging material is formed.

There is also a two-layer packaging material which is suitable for packs according to the invention which do not require weakening lines which laterally delimit the tear-open area, e.g. - from the outside, inside - from an aluminum foil, a coated kraft paper and the

Cold adhesive coating, each with individual thicknesses, such as those e.g. are indicated in the packaging material used in connection with FIGS. 1 and 2.

Other suitable two-layer packaging materials are e.g. - in each case from the outside inwards - from a 0.012 to 0.030 mm thick OPP film, a 0.02 to 0.04 mm thick PE film and a cold adhesive coating or from a 0.009 mm thick aluminum film, a 0.02 - 0.03 mm thick OPP film and the cold adhesive coating. In the former case, the PE film and in the second case, the OPP film forms the (stronger) slide.

Commercial usability

The gas-tight package according to the invention can primarily be advantageously used as a package for foods such as chocolates or baked goods and is optionally produced in the form of a tubular bag package. However, their commercial usability is not limited to packages for solid packaging goods.

Claims

PATENT CLAIMS:

1. Pack with a gas-tight packing envelope made of a flat, in particular flexible packaging material and a tear-open element, which is intended to be grasped at the beginning of the pack when it is opened and pulled in a predetermined tear-open direction, the packaging material having the edges of a strip or lobe-shaped Tear-open area tears, characterized in that the packaging material at the beginning of the tear-open area (4, 14, 24) has a linear punching or a weakening line piece (3, 13, 23) and that in the area of the punching or weakening line piece (3, 13, 23 ) the packaging material is detachably connected to a covering element (5, 15, 25), the surface area (6, 16, 26) of which is connected to the packaging material has a self-contained outer contour (7, 17, 27) which in the case of punching (3, 13, 23) completely encloses it, but it does so not touched

2. Pack according to claim 1, characterized in that additional weakening lines (2, 12) are provided in the packaging material, starting from the ends of the punching or the weakening line piece (3, 13) from the mutual bordering of the tear area (4, 14, 24 ) along which the packaging material tears when the package is opened.

3. Pack according to claim 1 or 2, characterized in that the cover element (5, 15) consists of a flat Ma material.

4. Pack according to one of claims 1 to 3, characterized in that the releasable and flat connection between the packaging material and cover element (5, 15) is provided by a binder layer.

5. Pack according to one of claims 1 to 4, characterized in that the cover element (5) comes to rest on the outer casing of the packing casing and that the minimum distance of the outer contour (7) of the surface connected to the packaging material

Surface area (6) of the cover element (5) from the punching or the weakening line piece (3) in the packaging material is at least 1 mm, but preferably at least 5 mm.

6. Pack according to one of claims 3 to 5, characterized in that the covering element consisting of a flat material (5) has a portion (8) which is not directly connected to the packaging material and which forms a removable tab.

7. Pack according to one of claims 3 to 5, characterized in that the covering element (15) consisting of a flat material comes to lie on the inside of the packing envelope and that the surface area connected with the packaging material is rich (16) of the covering element (15 ) in addition to its own outer contour (17) has a self-contained inner contour (18), the minimum distance from the outer contour (17) of which is at least 1 mm but preferably at least 5 mm and which at the beginning (20) of the tear-open area (14) linear punching (13) or the border of the tear-open area (14) does not cross or only crosses at two points, so that at the tear-open area a packaging material lapping can be lifted off.

8. Pack according to one of claims 3 to 7 with an at least approximately prismatic or zylindermantelför shaped packing envelope area, characterized in that the flat element consisting of a flat material (5,15) is arranged within this packing envelope area and that this area of a sleeve-shaped loop made of sheet material is covered.

9. Pack according to claim 8, characterized in that the sleeve-shaped loop in the region of the punching or the weakening line piece (3, 13, 23) simultaneously forms the cover element (5, 15, 25).

10. Pack according to one of claims 1 to 9, characterized in that the packaging material is formed by a plastic monofilm.

11. Package according to one of claims 1 to 9, characterized in that the packaging material is made of paper gebil det.

12. Package according to one of claims 1 to 9, characterized in that the packaging material is formed from an aluminum foil.

13. Pack according to one of claims 1 to 9, characterized in that the packaging material is made as a composite material from at least two different layers of sheet-like sheet material, one of which mainly as a carrier layer and the other at all actually serves as a gas-tight layer.

14. Pack according to claim 13, characterized in that in the case of the delimitation of the Aufrelßberei ches no lines of weakness are provided, in the pack the carrier layer faces the packaged goods.

15. Pack according to claim 14, characterized in that the carrier layer is made of a paper web or a plastic film.

16. Pack according to claim 14 or 15, characterized in that the gas-tight layer consists of an aluminum foil.

17. Pack according to claim 14 or 15, characterized in that the gas-tight layer consists of a plastic film.