EP1094013B1 - Film for making a container with delaminating tear line - Google Patents

Abstract

A packaging film (F) made from two or more layers (D, I) is joined by an adhesive (C) and has a pre-cut line (L) in one of the layers which acts as a tear line for opening. The tear line is made in a layer of the film which has a tear strength away from the line greater than that of the other layer, while the whole film away from the tear line has a tear strength at least twice that on the tear line, and equivalent to at least 0.23 daN.

Description

The invention relates to a film with precut of the kind that includes at least two layers, one of the layers comprising a material plastic and being precut along at least one line precut to favor the tearing of the film, in especially for opening a package.

FR-A-2 757 835 relates to a process for manufacture of packaging from at least one film having an upper layer and a lower layer made of plastic, constituting the external faces and internal of said packaging, and a central layer of metal slight sandwiching between said upper layers and lower. According to this method, at least one line of precut is performed by a laser beam on the bottom layer.

EP-A-0 875 369 relates to a manufacturing process packaging with a multilayer film. Layer exterior absorbs laser radiation and has a pre-cut line, produced by laser beam, for facilitate tearing. The bottom layer is formed by a heat-sealable film which does not absorb the beam laser. The tear resistance of the layer pre-cut, outside the pre-cut line, is not compared to each other's tear resistance layer.

US-A-5 613 779 relates to a sachet produced with a multilayer film. A layer which can be located at outside or inside, having great resistance tear, has a pre-cut slot. The other layer which is not precut is presented as also having high tear resistance. According to this document, there is therefore no difference sensitive, in tear resistance, for two layers.

In a two-layer association system one of which is precut, experience has shown that the tear caused by a user does not follow always the pre-cut line and can deviate from it, which is bothersome and should be avoided.

In particular, tests have been carried out in using polypropylene (PP) as the pre-cut layer very oriented which tears in a very linear fashion when it is alone (longitudinal tear, i.e. in the direction of extrusion). This precut layer of oriented polypropylene has been combined with a layer of polyethylene terephthalate (PET) so that the property easy tear either parallel, that is to say concordant, with the precut line. We were waiting for a good tear behavior, i.e. along the precut line, especially due to the easy tear property of the polypropylene in the direction of the precut. Now, a very bad behavior was observed during the tests, the tear deviating very easily from the line of pre-cut.

The object of the invention is, above all, to provide a film comprising at least two layers, one of which is precut along a precut line, and either such as the tear caused by a user follows well the precut line.

Such a result could be obtained, so surprising, with a precut layer which is sufficiently tear-proof for the tear to follow well the precut line. Paradoxically, to obtain a tearable film with at least two layers, one of which is relatively easily tearable and of which the other has a pre-cut line, we choose for the pre-cut layer one layer enough ripstop.

According to the invention, a film with precut comprising at least two layers, one of the layers comprising a plastic material and being precut along at least one pre-cut line, is characterized by the fact that the precut layer has, out of the pre-cut line, tear resistance greater than 0.3 decanewton (daN), while the other uncut layer has resistance to tear less than 0.07 daN, and that the film has resistance to tearing, out of line pre-cut, equal to at least twice its resistance to tear on the precut line

Preferably, the tear resistance of the pre-cut layer is at least twice as large as that of the other layer.

The film may include a layer of aluminum, of paper, cellulose, or the like.

Tear resistance is measured by a "pants test" (which derives from standard NFT 54141) performed at 20 ° C, at a speed of 900 mm per minute. The values given are each an average corresponding to a measurement time of 20 seconds, during which the sampling frequency will have been 50 milliseconds. These measurement conditions apply to all given tear resistance values thereafter.

Preferably, the tear resistance of the film out of the precut is at least 0.23 daN (Decanewton).

Preferably, the precut layer has a tear resistance between 0.5 daN and 2 daN (terminals included).

Note that when a range of values possible for a quantity is indicated in the description and claims, the terminal (s) of the range are included. This precision will not be repeated thereafter.

If necessary, the two layers of the film can exhibit a tendency to delamination, which favors monitoring the pre-cut line by tearing.

The pre-cut layer may be made of polymer; the polymer term should be understood in a general sense of so that it covers copolymers, terpolymers, interpolymers, polymer blends.

Examples of materials for the layer pre-cut are given below:

Oriented polyamide (OPA), polyamide cast (CPA), oriented polypropylene (OPP) including polypropylene bioriented (BOPP), polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC), polystyrene (PS), polymethyl methacrylate (PMMA), polychloride divinylidene (PVDC), polyvinyl divene fluoride (PVDF), polyethylene naphthalate (PEN), polyester which includes polyethylene terephthalate (PET) and polybutylene terephthalate (PBT), acrylonitrile-butadienestyrene terpolymer (ABS).

The nature of the uncut layer can be chosen from the same list of materials as for the pre-cut layer, it being understood that the materials of the two layers undergo different treatments causing their differences in resistance to tear ; in addition, the uncut layer can be made of aluminum or paper.

The pre-cut layer and the non-cut layer precut are associated by any process known in the state of the art, and adapted to the nature of the layers. Examples of such methods are given below : lamination (use of an adhesive to associate layers, for example aluminum / polyolefin such as PE or PP); coextrusion; calendering (= lamination at hot) ; coating extrusion; plaxing; coating.

The film generally has a thickness between 30 and 300 µm.

Advantageously, the precut layer represents at least 20% of the total thickness of the film and preferably at least 50% or even 95% of the thickness total.

The uncut layer usually has a thickness between 1 and 60 µm.

• Découpe mécanique, généralement par une lame à dents sous forme de roulette. La roulette roule sur le film défilant et perfore la couche sans enlèvement de matière, selon un pointillé. Une telle découpe mécanique est généralement réalisée avant assemblage de la couche prédécoupée avec l'autre couche. En général, la longueur non perforée entre deux trous est comprise entre 0,1mm et 5 mm. Les trous eux-mêmes ont généralement une longueur comprise entre 1mm et 1cm .
• Découpe au laser. Une telle découpe peut être réalisée dans la couche prédécoupée avant ou après son assemblage avec l'autre couche.

The precut along a dotted line of the precut layer can be done in one of the following ways:

• Mechanical cutting, usually with a toothed blade in the form of a wheel. The roller rolls on the moving film and perforates the layer without removing material, according to a dotted line. Such mechanical cutting is generally carried out before assembling the precut layer with the other layer. In general, the unperforated length between two holes is between 0.1mm and 5mm. The holes themselves are generally between 1mm and 1cm in length.
• Laser cutting. Such a cut can be carried out in the precut layer before or after its assembly with the other layer.

Assembled, the cut layer and the non layer pre-cut have a minimum of adhesion between them so as to constitute a film. It is however preferable that the adhesion between these two layers is not too strong, so there is a tendency to delamination (separation of the two sheets) under the effect mechanical stress, for example during a tear.

In order to promote delamination, we can add a layer of "organic matter" in the area of the precut. Organic matter can be a couple glue / varnish, delamination occurring at the interface layers of glue and varnish.

In the event that one undergoes a Corona treatment to the plastic layer that is to receive the layer of glue, you can reduce the adhesion between two layers in the pre-cut area omitting the Corona treatment in this area.

Each layer, pre-cut or not pre-cut, can of course be itself constituted by a assembly of several layers.

It is not excluded that the diapered layer includes a non-material layer plastic, like a paper diaper.

The invention also relates to a packaging, in particular of the sachet type, produced with a film as defined above, packaging which is wish to be able to open by hand in a controlled manner. In such packaging, made with a film according to the invention, the precut line is located under a sealing line which impermeability to the packaging.

The invention consists, apart from the provisions outlined above, in a number other provisions which will be more explicitly question below about examples of realizations described with reference to the accompanying drawings, but which are in no way limiting.

Figure 1 of these drawings is a section schematic, on a large scale, of a film of matter plastic according to the invention.

Figures 2 to 5 show, similarly to the Figure 1, alternative embodiments of the film material plastic.

Figure 6, finally, is an elevational view of a sachet type packaging made with a film according to the invention.

Referring to Figure 1 of the drawings, we can see a film F comprising two layers I and D of plastic material. Layer I is precut according to minus a line L, perpendicular to the plane of the figure 1, to promote the tearing of the film, in particular for opening a package.

Pre-cut layer I has resistance to the tear, outside the precut line L, higher than that of layer D, and the film F has resistance to tearing, out of line precuts L, at least twice its resistance to the tear on the precut line L.

The tear resistance of film F, out of the precut L, is at least 0.23 daN (decanewton).

Tests have shown that, in a way surprisingly, the precut layer I must be strong enough for the tear to follow well line L.

Preferably, the resistance of layer I to the tear is at least twice as large as that of the other layer D.

Advantageously, the layer I has, outside the line L, a tear resistance greater than 0.3 daN, while the other layer D has a tear resistance less than 0.07 daN.

More particularly, layer I has a tear resistance between 0.5daN and 2daN.

Layer I is made of polymer, the term polymer to be understood in a general sense which covers the copolymers, terpolymers, interpolymers, mixtures of polymers.

Examples of materials for layer I are given below:

Oriented polyamide (OPA), polyamide cast (CPA), oriented polypropylene (OPP) including polypropylene bioriented (BOPP), polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC), polystyrene (PS), polymethyl methacrylate (PMMA), polychloride divinylidene (PVDC), polyvinyl divene fluoride (PVDF), polyethylene naphthalate (PEN), polyester which includes polyethylene terephthalate (PET) and polybutylene terephthalate (PBT), acrylonitrile-butadienestyrene terpolymer (ABS).

The nature of layer D can be chosen in the same list of materials as for layer I. treatments applied to these materials are however different for layers I and D, to get the differences in tear resistance. Layer D can also be made of aluminum or paper.

Layers I and D are combined by a process state-of-the-art classic adapted to nature layers.

For example, the association can be made by lamination, using a layer of C adhesive to combine layers D and I. This is particularly the case when layer D is aluminum, while layer I is made of a polyolefin such as polyethylene (PE) or polypropylene (PP).

Other known methods can be used to associate layers I and D, for example the processes such as: coextrusion, calendering (= lamination hot); coating extrusion, plaxing; coating.

The film F generally has a thickness e between 30 and 300 µm.

Layer I represents at least 20% of the total thickness e of the film, and preferably at least 50% or even 95% of this total thickness e. Layer D generally has a thickness between 1 and 60 µm.

Despite the precut, the film F retains a perfect seal since the precut does not pass through it not completely.

The precut line L is a line in dotted, perpendicular to the plane of Figure 1, constituted by a succession of holes t which have generally a length (perpendicular to the plane of Figure 1) between 1 mm and 1 cm. The length no perforated between two holes is between 0.1 and 5 mm.

The cut along the dotted line L of the layer I can be done mechanically, generally by a toothed blade in the form of a wheel. Roulette rolls on the moving film and perforates without removing material layer I along a dotted line.

Such mechanical cutting is generally performed on layer I before its assembly with the layer D.

The realization of the precut line L can be provided by other methods, for example by a pre-cut with a pulsed laser beam allowing make a series of holes of reduced diameter.

Such laser cutting can be performed in layer I before or after its assembly with the layer D.

The precut must be performed so that the tear resistance of the attachment points (between two holes) is less than the resistance to tear outside the precut. This is obtained in bringing the holes close enough so that the tear behavior between holes either different and influenced by the presence of the holes by relative to an area free of holes. It is the same for the pre-cut layer itself.

Preferably, the precut crosses entirely the pre-cut layer. This is more easily achieved if the layer is precut before being associated, by example by gluing, to the other layers for the film making. Indeed, in this way, the means of precut can be more straightforward without risking precut other layers that are not intended to being.

Mechanical cutting is preferred over laser cutting. Indeed, the laser impact creates a crater on the surface of the film. This crater is an obstacle to the spread of the tear in the precut line and may tend to diverge the spread of the tear in the precut line. In addition, a laser cutting requires the presence of a layer of aluminum which reflects the laser light. A mechanical precut on one of the layers, in particular before assembly, eliminates the need a layer of aluminum in the film.

Layers I and D assembled have a minimum adhesion between them so as to constitute the film F. It is advantageous that the adhesion between the two layers I and D is not too strong, so the film F has a tendency to delamination (separation of layers I and D) when subjected to tearing or shearing forces.

In particular, it is desirable that this tendency of the two layers I and D to separate occurs in the area of the precut line L.

Advantageously, the resistance to delamination is less than 0.2 daN / 15 mm. Resistance to delamination is measured by a T-peel test at 180 ° angle with a speed of 300 mm per minute, on a strip 15 mm wide.

To promote delamination, we can add a layer of "organic matter" in the area of the precut line L for example between layer I and the glue layer C. Figure 2 is an example of such structure. A layer of V varnish is applied against the side of layer I located on the side of the adhesive layer C and in the area of the precut line L. The nailpolish V constitutes the "organic matter" favoring the delamination of the film at the interface of V varnish and glue C. V varnish may include an incoming resin in the composition of inks commonly used in rotogravure or flexogravure.

More specifically, in the example in Figure 2, layer I is formed by the assembly of a layer 1 of polyethylene PE and layer V of varnish which adheres to the inner face of layer 1, in the area of the line precut L. Layer D is formed by joining a layer 2 of oriented polypropylene (OPP) and glue layer C.

Figure 3 illustrates an alternative embodiment of a film F of FIG. 2. The layer of varnish V, according to Figure 3, is located at the interface of the layer of glue C and OPP layer 2 in the line area precut L. The adhesion is reduced to the interface of the adhesive layer C and the varnish V.

Layer I, in the case of Figure 3, is formed by the assembly of layer 1 of polyethylene and glue layer C, while layer D includes the assembly of layer 2 and layer V of varnish.

Other means may be provided to ensure a decrease in the adhesion between the two layers I and D in the precut area L. For example, it is common to subject the plastic sheet which must receive the layer of glue C a treatment Corona promoting adhesion between layers. For decrease the adhesion between the two layers I and D in the precut area L, just do not perform Corona treatment in this area on the sheet of plastic material receiving the adhesive layer.

Figure 4 illustrates a first example of a such structure. The precut line L is made in layer 1 of PE, which is associated by a layer of glue C to layer 2 of OPP. The face of the layer 1 of PE in contact with the adhesive layer C has undergone Corona treatment with the exception of marked area 3a by dashes to the right of line L. This zone 3a does not Corona treated promotes delamination at this location between layer 1, constituting layer I, and the whole layer 2 and glue C constituting layer D.

Figure 5 shows a variant of the structure of FIG. 4, according to which the face of layer 2 of OPP intended to come into contact with the adhesive layer C underwent Corona treatment with the exception of zone 3b, marked with dashes, to the right of line L. This Corona untreated zone 3b promotes delamination between layer 2 and layer of glue C. The whole of the layer 1 of PE and the layer of adhesive C constitutes the layer I while layer D consists of the single layer 2.

Examples of film according to the invention are given below in the form of a list of different layers of the film.

First example - PET / glue / LDPE

The PET / glue association is considered to be forming the uncut layer. The thickness of the PET layer is 12 µm. The thickness of the layer of glue is equal to 1.8 µm. The glue is of the type polyurethane.

The PET / glue layer has resistance to tear (abbreviated: RD) less than 0.05 daN.

The thickness of the LDPE layer is equal to 80 µm. The LDPE layer has an RD (resistance to tear) of 0.8 daN.

The film has an RD of 0.07 daN on the precut and 0.8 daN without precut.

PET layer can be printed inside or outside, or not be printed at all.

The precut L is made in the layer of LDPE by mechanical cutting before laminating on the PET, with a length of each hole equal to 3 mm and a distance between holes equal to 2 mm.

Precise values of layer thicknesses have been given above in correspondence with the values precise tear, since the thickness has a influence on tear resistance. It's clear that these precise values are not limiting, this note being valid for all the examples given.

So the thickness of the PET layer can be between 5 and 30 µm. The thickness of the layer of glue can be between 1 and 4 µm. The thickness of the LDPE layer can be between 40 and 200 µm.

Second example - PET / glue / aluminum / glue / LDPE

The PET layer has a thickness of 12 µm. The thickness of the adhesive layer, between PET and aluminum, is equal to 2 µm. The thickness of the layer of aluminum is equal to 9 µm. The thickness of the layer of glue between aluminum and LDPE is equal to 2 µm.

The association PET / glue / aluminum / glue is the uncut layer that has an RD less than 0.05 daN.

The thickness of the LDPE layer is equal to 140 µm. The LDPE layer has an RD of 0.8 daN.

The complex film has an RD of 0.22 daN on the precut and 1.5 daN excluding precut.

As in the previous example, the precut L is made in the LDPE layer before assembly, because do not risk damaging the diaper aluminum which acts as a barrier against gas and moisture. The length of each hole is equal to 3 mm and the distance between holes equal to 2 mm.

More generally, the PET layer may have a thickness between 5 and 30 µm. The thickness of the adhesive layer, between PET and aluminum, is included between 1 and 4 µm. The thickness of the aluminum layer is between 6 and 45 µm. The thickness of the layer of glue between aluminum and LDPE is included in the same limits than those of the first layer of glue. The thickness of the LDPE layer is between 40 and 200 µm.

Third example - PET / glue / PP

This example differs from the previous one by the replacing the LDPE layer with a PP layer (polypropylene) which allows the realization of a packaging sterilizable.

The PET layer has a thickness of 12 µm. The thickness of the adhesive layer is 1.8 µm. The PET / glue association has an RD of less than 0.05 daN.

The PP layer has a thickness equal to 100 µm and an RD equal to 0.9 daN.

The film has an RD of 0.1 daN on the precut and an RD of 0.45 daN excluding precut. The length of each pre-cut hole is 4 mm and the distance between holes equal to 1 mm.

More generally, the thicknesses of the different layers are within the same limits as those data for the second example, the limits given for the LDPE layer applying to those of PP.

Fourth example PET / adhesive / aluminum / adhesive / BOPA / glue / PP

The PET layer has a thickness of 12 µm. The adhesive layers are 2 µm thick. The aluminum layer has a thickness equal to 9 µm. The BOPA (biaxially oriented polyamide) layer has a thickness equal to 15 µm. The PP layer has a thickness equal to 60 µm.

More generally, the PET layer has a thickness between 5 and 30 µm. Glue layers have a thickness between 1 and 4 µm. Layer aluminum has a thickness between 6 and 45 µm. layer of BOPA (bi-oriented polyamide) has a thickness between 10 and 40 µm. The PP layer has a thickness between 40 and 200 µm.

The BOPA layer, or possibly the layer OPA (oriented polyamide) has the advantage of protecting the aluminum layer which tends to puncture when the film is folded, and improves the strength of the packaging to shocks.

a) réalisation d'un film PP/colle/BOPA (ou OPA) ;

b) réalisation de la ligne de prédécoupe L dans le film réalisé en a) ;

c) contrecollage d'une couche de PET sur une couche d'aluminium, pour obtenir l'ensemble PET/colle/aluminium ;

d) contrecollage du film obtenu en c) sur celui obtenu en b).

The precut L is made in the PP + glue + BOPA (or OPA) assembly. The length of each hole is 3 mm and the distance between holes is 2 mm. The film can be produced according to the following process:

a) production of a PP / glue / BOPA (or OPA) film;

b) production of the precut line L in the film produced in a);

c) laminating a layer of PET onto a layer of aluminum, to obtain the PET / glue / aluminum assembly;

d) laminating the film obtained in c) to that obtained in b).

In all the examples, the glue can be a solvent-based adhesive of polyurethane type, or solvent-free polyurethane type, or on an acrylic base.

Of course, layers D and I, like this results from the previous explanations, can be each formed from an assembly of several layers.

The film F can be used to make any type of packaging you want to be able to open hand in a controlled manner.

Figure 6 illustrates such packaging made up by a bag 4 made with film F, this bag containing a liquid, for example a food liquid such as a sauce.

The bag 4 has a bellows bottom 5 of which the cross section in the middle part a substantially a W shape when the bag is empty and flattened, the bottom being able to open during filling to constitute a seat allowing the stand up bag.

The bag has two side walls, by example of rectangular shape, which are welded one to the other along their longitudinal edges.

The precut line L is provided in the film on the side opposite the bottom 5. Preferably, a line of precut L is provided on each side of the bag 4. The precut line L is located under a line of solder 6 which closes the bag tightly.

The walls of the bag are of course tight the location of the precut line L due to the continuity of layer D at this location.

The bag 4 is opened by tearing the film at line L. The tear, with the film F of the invention, propagates exactly according to the line L without deviating towards the bottom 5 of the bag which would be particularly unfortunate because the liquid in the sachet could spread uncontrollably.

Whatever the application of the film according to the invention, the tear is carried out well according to the line L thanks to the combination of layer D and layer I, more difficult to tear, in which is planned the precut.

• la nature du matériau;
• l'épaisseur des couches;
• la prédécoupe, par la largeur des trous et des espaces entre les trous.

To obtain the desired tear resistance values, a person skilled in the art can play on:

• the nature of the material;
• the thickness of the layers;
• the precut, by the width of the holes and the spaces between the holes.

So in order to achieve the sufficient difference tear resistance for the film without precut and on the precut, the skilled person can, for given materials, both on the one hand increase the thickness of the precut layer, and on the other hand, increase the length actually cut on the line by cutting out the length of the holes and decreasing the distance between the holes.

Claims (23)

1. Film with scoring, which comprises at least two layers, one of the layers comprising a plastic and being scored along at least one score line in order to promote tearing of the film, characterized in that the scored layer (I) has, away from the score line (L), a tear strength of greater than 0.3 daN whereas the unscored other layer (D) has a tear strength of less than 0.07 daN and in that the film has a tear strength, away from the score line, equal to at least twice its tear strength on the score line.
2. Film according to Claim 1, characterized in that the tear strength of the film away from the scoring is at least 0.23 daN (decanewton).
3. Film according to Claim 1 or 2, characterized in that the tear strength of the scored layer (I) is at least twice that of the other layer (D).
4. Film according to Claim 1, characterized in that the scored layer (I) has a tear strength of between 0.5 daN and 2 daN.
5. Film according to one of the preceding claims, characterized in that the scored layer (I) is made of polymer, comprising copolymers, terpolymers, interpolymers and polymer blends.
6. Film according to Claim 5, characterized in that the scored layer (I) is made of a material chosen from the following group of materials: oriented polyamide (OPA), cast polyamide (CPA), oriented polypropylene (OPP), including biaxially oriented polypropylene (BOPP), polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC), polystyrene (PS), polymethyl methacrylate (PMMA), polyvinylidene dichloride (PVDC), polyvinylidene difluoride (PVDF), polyethylene naphthalate (PEN), polyester, including polyethylene terephthalate (PET) and polybutylene terephthalate (PBT), and acrylonitrile-butadiene-styrene terpolymer (ABS).
7. Film according to Claim 5 or 6, characterized in that the nature of the unscored layer (D) is chosen from the same list of materials as for the scored layer (I), the materials of the two layers undergoing different treatments leading to their differences in tear strength.
8. Film according to one of Claims 1 to 6, characterized in that the unscored layer (D) is made of aluminium or paper.
9. Film according to one of the preceding claims, characterized in that the scored layer (I) and the unscored layer (D) are combined by one of the following processes: complexing; coextrusion; calendering; coating; extrusion coating; lamination.
10. Film according to one of the preceding claims, characterized in that it has a thickness of between 30 and 300 µm.
11. Film according to one of the preceding claims, characterized in that the scored layer (I) represents at least 20% of the total thickness of the film.
12. Film according to Claim 11, characterized in that the scored layer (I) represents at least 50%, or even 95%, of the total thickness.
13. Film according to one of the preceding claims, characterized in that the unscored layer (D) has a thickness of between 1 and 60 µm.
14. Film according to one of the preceding claims, characterized in that the scoring (L) of the layer (I) is carried out along a dotted line by mechanical cutting, in particular by a toothed blade in the form of a scoring wheel.
15. Film according to Claim 14, characterized in that the scoring (L) passes entirely through the scored layer (I).
16. Process for manufacturing a film according to Claim 15, characterized in that the scoring (L) of the layer (I) is carried out before the layer (I) is joined to the other layer (D).
17. Film according to Claim 14 or 15, characterized in that the unperforated length between two holes is between 0.1 mm and 5 mm and the holes themselves have a length of between 1 mm and 1 cm.
18. Film according to one of Claims 1 to 15 or 17, characterized in that the adhesion between the scored layer (I) and the other layer (D) is not too strong, so that there is a tendency to delaminate, in particular in the region of the scoring (L), the resistance to delamination being less than 0.2 daN/15 mm.
19. Film according to Claim 18, characterized in that, in order to promote delamination, a layer of organic material, in particular an adhesive (C)/varnish (V) pair, is added in the region of the scoring (L), delamination occurring at the interface between the adhesive (C) and varnish (V) layers.
20. Film according to Claim 18, characterized in that, if the surface that has to receive the layer of adhesive is subjected to a corona treatment, the corona treatment is omitted in the region of the scoring (L).
21. Film according to one of Claims 1 to 15 or 17 to 20, characterized in that each layer (scored layer (I) or unscored layer (D)) consists of a multilayer assembly.
22. Package, in particular of the sachet type, produced from a film according to one of Claims 1 to 15 or 17 to 21.
23. Package according to Claim 22, characterized in that the score line (L) lies beneath a weld line (6).

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