WO2011023385A1

WO2011023385A1 - Polypropylene film comprising an opening aid

Info

Publication number: WO2011023385A1
Application number: PCT/EP2010/005223
Authority: WO
Inventors: Angela Speith-Herfurth; Patrick Stuppi; Leo Wintrich; Jörg STEINBRECHER; Markus Henne
Original assignee: Treofan Germany Gmbh & Co. Kg
Priority date: 2009-08-28
Filing date: 2010-08-26
Publication date: 2011-03-03
Also published as: EA201270329A1; EA023195B1; PL2470441T3; US20120152773A1; EP2470441B1; BR112012004390A2; MX2012002474A; KR20120059519A; CA2771912A1; UA115860C2; AU2010288875B2; JP2013503080A; EP2470441A1; CN102498047A; DE202010018143U1; AU2010288875A1; CN102498047B; ZA201201384B

Abstract

The invention discloses a biaxially oriented film (2) consisting of polypropylene with perforated lines. Said film has at least two perforated lines running parallel to one another at a maximum distance of 10mm. The perforations (1) of the two lines are offset in relation to one another.

Description

Polypropylene film with opening aid

The present invention relates to a biaxially oriented polypropylene film with perforation and a package of biaxially oriented polypropylene film with a perforation as an opening aid.

The success of biaxially oriented plastic films, particularly thermoplastic polymer films, and especially biaxially oriented polypropylene films, is essentially due to their excellent mechanical strength properties in conjunction with comparatively low weight, good barrier properties and good weldability. The polyolefin film protects the packaged goods against rapid drying or loss of flavor with very low material usage.

The desire of the consumer for a hygienic, visually appealing, tightly closed and resistant packaging is opposed to the desire for an easy and controllable opening. The latter is criticized by consumers in the packaging of polyolefin films and regarded as a disadvantage compared to paper packaging.

Uniaxially oriented films show a low tear strength in the direction of orientation and can be easily controlled in this direction and tear further. However, uniaxially oriented films are not usable in many fields, among other things due to insufficient transverse mechanical strengths. The biaxial orientation, on the one hand, produces the desirable high strengths (moduli) in both dimensions; on the other hand, but also the preferred directions are equalized. This has the consequence that for opening a foil packaging (eg biscuit bag) first a high force must be overcome in order to tear the foil. However, once the film has been injured or scratched, a crack will be planted even when using very low tensile forces uncontrollably continued. These inadequate service properties due to an excessively high tear strength in combination with a very low tear strength reduce the acceptance of film packaging in the end consumer market, despite the advantages mentioned at the outset.

In the prior art it has been proposed to provide the film with a predetermined breaking point. When opening, the film breaks in this predetermined breaking point. Nevertheless, the crack often propagates very uncontrolled, since these solutions facilitate tearing but do not really help with controlled tearing.

Another known possible solution is the mechanical installation of a predetermined breaking point in the form of a perforation or notches along an imaginary opening line. Often, however, such a perforation does not ensure a controlled tearing. When opened, the tear only initially follows the perforation line and then continues as desired in the material. This uncontrolled tear propagation behavior is particularly problematic in biaxially oriented polypropylene films, since the tear propagation resistance is particularly weak in this material. This problem is particularly troublesome for packages with general cargo, which is not loose, but packaged orderly, such as cigarette rods, Weetabix, crispbread, biscuit rolls and the like. These types of packaging are particularly designed to ensure that the consumer initially only picks individual pieces and wants to store the remainder of the package in order to remove more units at a later date. For this application, the uncontrolled tear propagation of the film packaging is particularly annoying for the consumer. WO 98/2312 describes packages which are pre-cut by a laser beam. These packages have a multilayer structure. In particular, a metallic intermediate layer is provided which is intended to prevent the laser beam from cutting through the film. This packaging is lavish and expensive due to the lamination with a metal layer. About the exact configuration of the packaging is disclosed in the description nothing.

In addition, the perforated film must have sufficient mechanical stability so that the perforated film can be used to package the piece goods. There are described in the prior art method in which the perforation is integrated as a processing step in the packing process. This solution avoids any mechanical stresses on the perforated film, e.g. when winding up and unwinding. However, the integration of the perforation is not possible in all packaging processes. Firstly, the spatial conditions in the existing system are often designed so that there is simply no room to grow such a device. Furthermore, the packaging processes in the cigarette industry are running at very high speeds, which may be too fast for the perforation. Therefore, it is not always possible to incorporate a device for perforating the foil into a device for bar wrapping cigarette packets. A sufficient mechanical stability of the film is contrary to the same desire for an easy-open packaging. The object of the present invention was to provide an improved package for ordered cargo available.

The problem underlying the invention is achieved by a

Packaging of biaxially oriented film of polypropylene, which contains piece goods, wherein the film has at least two perforation lines, which run parallel to each other and at a maximum distance of 10mm located and the perforations of the two lines are offset from each other.

The object is further achieved by a method for wrapping piece goods, in which a perforated film unwound from a roll and used for packaging the piece goods.

1 shows an embodiment of the film (2) with circular perforations (1) with a length (diameter) B. The length of the distances between the perforations corresponds to the length A. Both parallel perforation lines are arranged at a distance from each other C. In the embodiment according to FIG. 1, the distances A are the same length as the length of the perforations B. The perforation line are offset relative to one another such that the center of the respective perforation is aligned with the center of the opposite distance.

FIG. 2 shows a film with circular perforations whose length B is greater than the distances A. FIG. 3 shows perforations with a rectangular geometry, wherein here too B> A.

Fig. 4 shows a film with diamond-shaped perforations, as they are produced for example by rotating blades.

Fig. 5 shows a film with elliptical perforations. Again, B> A.

Fig. 6 shows a possible geometry of a needle perforation which results in propeller-like perforations.

Fig. 7 shows a film web having a plurality of perforation double lines in Longitudinal direction.

Fig. 8 shows a package (3), which is opened by breaking along the perforation double line (4).

All these embodiments according to FIGS. 1 to 8 have in common that the distances A between the perforations are just as large or smaller than the length B of the perforation itself. The two parallel, offset perforation lines form a predetermined breaking point in the film, in which a crack propagated after tearing very controlled. The tear continues to run after tearing along one of the perforation line or between the two parallel perforation lines controlled. The foil packaging is opened only as far as desired.

The packaging according to the invention is particularly suitable for ordered or stacked piece goods, e.g. Cigarette packs, as well as pasty products such as butter, sausage and the like suitable. It is possible for the consumer to tear the film along a predetermined predetermined breaking point in such a way that individual pieces can be removed without further units falling out uncontrollably in the case of piece goods. The individual segments between the parallel perforation lines are adapted according to the size of the unit to be removed. This can be used to control whether one or more units can be conveniently removed with one open.

The perforation lines can be applied to the film web in a suitable pattern. Preferably, the lines are straight. However, it is also possible to apply the line with any geometric shape, so that the predetermined breaking point later corresponds to the shape and dimensions of the packaged piece goods. The perforation lines can be produced by mechanical perforation, for example by means of needles or knives or by a laser beam or in another way, so that a continuous hole is formed in the film. For the purposes of the present invention, however, perforations are also understood as meaning thin areas in which no continuous hole is produced in the film, but the film only becomes thinner at the corresponding points due to removal of material, for example by a laser beam which only penetrates to a predetermined depth. In these embodiments, 10 to 80% of the original film thickness, preferably 20 to 60% of the original film thickness in the region of the thin location remain. In this way, a closed package is obtained, which continues to meet all hygienic requirements and their barrier properties are not impaired.

Along the perforation line on holes, incisions or thin places (perforations B) alternately undamaged film sections whose length A is determined by the distance of the perforations. For the purposes of the present invention, distances are thus the areas of undamaged film which extend from the end of a perforation to the beginning of the subsequent perforation in the same perforation line.

The geometric shape of the perforation can vary and depends on the perforation method. Needles or rotating blades can be used for the perforation. For perforation lines from non-continuous thin sites, laser or ultrasound are preferred. Needle perforations create circular or ellipsoidal or propeller-like shapes that result from the needle and foil being in contact at the perforation and moving relative to each other. Knife perforations produce more rectangular or diamond-shaped cuts or thin spots. Laser and ultrasound methods allow different geometric shapes. Except in the case of circular perforations, all perforations have a greater extension in one of the two principal directions (longitudinal direction) aligned along the line of perforations. The perforations have in the longitudinal direction in general a length B of 0.1-8 mm, preferably 0.3 to 6 mm, in particular 0.5 to 3 mm. The extent of the perforation transversely to this longitudinal direction is correspondingly smaller and is generally 5 to 80%, preferably 10 to 50% of its extension in the longitudinal direction. This does not apply to circular perforations. Circular and approximately circular perforations have a diameter of 0.1-6 mm, preferably 0.3 to 5 mm, in which case the diameter of the length of the perforation B corresponds.

For a particularly low tearing force, in particular perforations with a length of> 1 to 6 mm are preferred, in particular also lengths of 1, 5 to

6mm or 2 to 4mm suitable. Surprisingly, the mechanical ones are also in these relatively large or long perforations

Strengths of the film is not affected. These embodiments can be excellent to wind up a film roll and unwind easily on the packing machine again.

The length A of the sections, ie the undamaged film between the perforations is 0.05 to <8mm, preferably 1 to 6mm. For embodiments with long perforations of, for example, 1.5 to 6 mm, distances of> 4 to 10 mm are preferred. The dimensions of the distances A are selected in relation to the length B of the perforation so that these lengths B of the perforations are at least as large or larger than the distances A. In general, the length or diameter of a perforation is at least 10% greater than the length of the gaps. In general, the length A of the distances is 10 to 90% of the length B of the perforations, preferably 20 to 85%. The dimensions given for the perforations and distances apply in the same way also to perforations in the form of non-continuous thin spots, which in turn may likewise be circular, elliptical or oblong.

Along a line, the dimensions of the distances between the perforations are generally constant, or vary only slightly within the usual manufacturing accuracy. In the same way, the size of the individual perforations along a line does not vary or only slightly (up to 10%), ie, for example, the diameter of the holes or the length of a perforation is constant. Likewise, the perforations and distances of the two parallel perforation lines of a predetermined breaking point have approximately the same dimensions. It is essential to the invention that an intended breaking point is formed from two parallel perforation lines, which are arranged at a distance C of not more than 10 mm. The distance C of these two lines is preferably 0.5 to 8 mm, in particular 0.8 to 5 mm. The second feature of the predetermined breaking point which is essential to the invention is the arrangement of the perforations of the two parallel perforation lines relative to each other. It has been found that an offset arrangement of the perforations of the two lines improves the control of crack propagation surprisingly. In this staggered arrangement, a perforation of the second line does not start at the same height as the opposite perforation of the first line. As a result, the perforation of the second line at least partially covers the distance of the first perforation line. In preferred embodiments, especially those in which the perforations are larger than the distances, the portions of the one perforation line are completely covered by the perforations of the opposite lines. In a preferred embodiment, the center of the sections of the first perforation line is aligned with the center of the respective opposite perforations of the second perforation line, so that a symmetrical perforation pattern is formed.

Surprisingly, the arrangement of two parallel, mutually offset perforation lines significantly improves the control of the crack profile. The invention also makes it possible to break off the packaging at the predetermined breaking point over the edges of the piece good if the piece goods have a corresponding mechanical stability and the piece goods in the package is arranged so that its edge extends at the level of the double line. The perforation lines are generally applied in the machine direction of the film. The perforation can be combined simultaneously with the cutting of the film to narrower film widths and thus carried out in one operation. Alternatively, the perforation can also be done before or after cutting to the finished film width. In all these variants of the method, the film for perforation, for example, over rollers with suitable perforation tools out, for example, these rollers are equipped with needles or knife blades. In laser or Ultraschallperfoherungen appropriate tools are positioned below or above the film web. In this process, the film to be perforated is unwound from a roll, the perforations according to the invention are applied and the perforated film is then rewound and the roll used at the facilities for packaging of piece goods, ie unwound and used for wrapping the goods. Surprisingly, the perforations do not or only insignificantly impair the wrapping behavior of the film, so that the perforated film can be wound up and unwound with the usual devices. It was also surprising that the perforation according to the invention does not affect the mechanical stability of the film so that arise during winding and unwinding of Folia tears, film tears, thick areas or dilations. The roll of perforated film is used to make the package of the invention. The packaging according to the invention is particularly suitable for ordered or stacked piece goods, as well as pasty products such as butter, sausage and the like. It is possible for the consumer to tear the film along a predetermined predetermined breaking point in such a way that individual pieces can be removed without other uncontrolled fall out in the case of general cargo. The individual segments are adapted according to the size of the unit to be removed. This can be used to control whether one or more units can be conveniently removed after opening.

The film used is generally a biaxially oriented film of polypropylene. Depending on the type of packaging, the film can be a translucent to transparent or an opaque film. For the purposes of the present invention, "opaque film" means an opaque film whose light transmittance (ASTM-D 1003-77) is at most 70%, preferably at most 50%. The film can basically be constructed as a single layer or as a multilayer. Also suitable for the packaging according to the invention are laminates, which are preferably constructed from the films described herein. For transparent embodiments, the formulation of the film and the type of laser can be coordinated so that the laser beam in the field of thinning leaves a white or colored line. Thus, the packaging later has a recognizable mark and indicates to the consumer where the crack to open the package to allow convenient handling. Possible thermoplastics for the film are polyolefins of olefinic monomers having 2 to 8 carbon atoms. Propylene polymers, ethylene polymers, butylene polymers, cycloolefin polymers or copolymers of propylene, ethylene, butylene units or cycloolefins are particularly suitable. In general, the layers of the film, or the layer for single-layer embodiments, at least 50 wt .-%, preferably 70 to 99 wt .-%, in particular 90 to 98 wt .-%, of the thermoplastic polymer, each by weight the layer. As polyolefins, propylene polymers are preferred. These propylene polymers contain 90 to 100 wt .-%, preferably 95 to 100 wt .-%, in particular 98 to 100 wt .-%, of propylene and has a melting point of 120 ⁰ C or higher, preferably 130 to 17O ⁰ C, and im in general a melt flow index of 0.5 g / 10 min to 15 g / 10 min, preferably 2 g / 10 min to 10 g / 10 min, at 230 ⁰ C and a force of 21, 6 N (DIN 53 735). Isotactic propylene homopolymer having an atactic content of 15% by weight and less, copolymers of ethylene and propylene having an ethylene content of 10% by weight or less, copolymers of propylene with C ₄ -C ₈ olefins having an olefin content of 10% by weight. % or less, terpolymers of propylene, ethylene and butylene having an ethylene content of 10% by weight or less and having a butylene content of 15% by weight or less are preferred propylene polymers for the core layer, with isotactic propylene homopolymer being particularly preferred. The stated percentages by weight relate to the respective polymer.

Furthermore, a mixture of said propylene homo- and / or copolymers and / or terpolymers and other polyolefins, in particular from monomers having 2 to 6 carbon atoms, suitable, wherein the mixture at least 50 wt .-%, in particular at least 75 Wt .-%, containing propylene polymer. Suitable other polyolefins in the polymer blend are polyethylenes, especially HDPE, LDPE ₁ VLDPE and LLDPE, wherein the proportion of these polyolefins each 15 wt .-%, based on the polymer mixture, does not exceed.

If appropriate, a layer, preferably the base layer or an intermediate layer, of the film for opaque embodiments may additionally contain pigments and / or vacuole-initiating particles in customary amounts.

The film of the invention may be single-layered, preferably the film is multi-layered. For this purpose, one or both sides of the intermediate layer and / or cover layers may be applied to the base layer. Accordingly, multi-layered embodiments of the film in addition to the base layer, optionally intermediate layers and outer layers.

These additional cover layers and / or intermediate layers are generally composed of polyolefins. They contain at least 70 wt .-%, preferably 75 to 100 wt .-%, in particular 90 to 98 wt .-%, of a polyolefins. As polyolefins for these additional layers are basically the same polymers as described above for the base layer.

For the cover layers are

Copolymer of

Ethylene and propylene or

Ethylene and butylene or

Propylene and butylene or

Ethylene and another olefin having 5 to 10 carbon atoms or

Propylene and another olefin having 5 to 10 carbon atoms or a terpolymer of

Ethylene and propylene and butylene or

Ethylene and propylene and another 5 to 10 olefin

Carbon atoms or a mixture or blends of two or more of said homo-, co- and terpolymers suitable.

Below are

ethylene-propylene random copolymers with

an ethylene content of 2 to 10 wt .-%, preferably 5 to 8 wt .-%, or random propylene-butylene-1 copolymers with

a butylene content of 4 to 25 wt .-%, preferably 10 to 20 wt .-%, each based on the total weight of the copolymer, or

ethylene-propylene-butylene-1-terpolymers with

an ethylene content of 1 to 10 wt .-%, preferably 2 to 6 wt .-%, and a butylene-1 content of 3 to 20 wt .-%, preferably 8 to 10 wt .-%, each based on the total weight of the terpolymer, or

a blend of an ethylene-propylene-butylene-1 terpolymer and a propylene-butylene-1 copolymer

with an ethylene content of 0.1 to 7% by weight

and a propylene content of 50 to 90 wt .-%

and a butylene-1 content of 10 to 40% by weight,

in each case based on the total weight of the polymer blend,

particularly preferred.

The co- or terpolymers described above generally have a melt flow index of from 1.5 to 30 g / 10 min, preferably from 3 to 15 g / 10 min. The melting point is in the range of 120 to 140 ⁰ C. The blend of copolymers and terpolymers described above has a melt flow index of 5 to 9 g / 10 min and a melting point of 120 to 150 ⁰ C. All the melt flow indices given above are measured at 230 ⁰ C and a force of 21, 6 N (DIN 53 735) measured. Layers of co- and / or terpolymers preferably form the outer layers of sealable embodiments of the film. The total thickness of the film can vary within wide limits and depends on the intended use. The preferred embodiments of the film have total thicknesses of 5 to 250 microns, with 10 to 100 .mu.m, in particular 20 to 80 microns, are preferred.

For the purposes of the present invention, the base layer is the layer which makes up more than 50% of the total thickness of the film. Their thickness results from the difference between the total thickness and the thickness of the applied cover and intermediate layer (s) and can therefore vary within wide limits analogously to the total thickness. Cover layers form the outermost layer of the film and are 0.5 to 5 microns, preferably 1 to 3 microns. The intermediate layer is between 1 and 20 microns, preferably 1 to 10 microns.

In order to further improve certain properties of the polypropylene film according to the invention, both the base layer and the intermediate layer (s) and the topcoat (s) may contain additives in an effective amount, preferably hydrocarbon resin and / or antistatics and / or antiblocking agents and / or lubricants and / or or stabilizers and / or neutralizing agents which are compatible with the polymers of the core layer and the top layer (s), with the exception of the generally incompatible antiblocking agents.

The films are produced by the extrusion process known per se. In the context of this process, the melts corresponding to the individual layers of the film are extruded through a flat die. The film thus obtained is stripped to solidify on one or more roll (s) and cooled. The temperature of the off roll or rolls is 10 to 90 ⁰ C, preferably 20 to 60 ⁰ C. Subsequently, the film is stretched biaxially. The biaxial stretching can be carried out simultaneously or sequentially, with the successive biaxial stretching in which stretching is first longitudinal (in the machine direction) and then transverse (perpendicular to the machine direction) is particularly favorable. In the longitudinal direction is preferably 3: 1 to 7: 1 and at a temperature of less than 140 ^C C, preferably in the range of 125 to 135 ⁰ C stretched. In the transverse direction is preferably 5: 1 to 12: 1, at a temperature of greater than 140 ⁰ C, preferably at 145 to 16O ⁰ C, stretched. The longitudinal stretching will be carried out expediently with the help of two different speeds corresponding to the desired stretching ratio and the transverse stretching with the aid of a corresponding clip frame. In principle, biaxial stretching can also be carried out simultaneously in the longitudinal transverse direction. These simultaneous stretching methods are known per se in the prior art.

The film is held in conclusion about 0.5 to 10 s at a temperature of 110 to 15O ⁰ C for heat-setting (heat treatment). Optionally, as mentioned above, after biaxial stretching, one or both surfaces of the film may be corona or flame treated by one of the known methods. Optionally, after production but before perforation, the film may be laminated, coated, melt-coated, painted or laminated by further processing steps to provide the film with further advantageous properties. As laminates, composites of polypropylene films and polyethylene films are particularly preferred. Such composites can be produced by lamination of the individual films. Another technically advantageous variant for the production of PP / PE laminates is the extrusion coating of a suitable polyethylene onto a biaxially oriented polypropylene film. Such extrusion coatings are known per se in the prior art. It has been found that laminates of PP / PE films are advantageous in the treatment by laser beam and are less likely to be perforated by mistake. The packaging according to the invention is characterized by a controllable tear behavior. Optionally, the force required to initiate a tear at the foil edge can be reduced by a notch, preferably V-shaped. The packaging is much easier and more controlled to continue. In addition, it also shows all the advantages that conventional film packaging also have, such as high mechanical strength, water and oxygen barrier, good optical properties. The packaging according to the invention is particularly advantageous to use for piece goods, in particular for stacked units, such as biscuits, cigarette packets or pressed food moldings.

The film with the perforation according to the invention enables a novel packaging solution for cigarette rods. The packets of cigarettes are stacked and wrapped in the film with the perforation according to the invention. These cigarette rods can then be opened at the predetermined breaking point by breaking along the perforation line. The invention is explained in more detail by the following examples:

example 1

A transparent three-layer ABA film with a symmetrical structure with a total thickness of 20 μm was produced by coextrusion and subsequent stepwise orientation in the longitudinal and transverse directions. The cover layers had a thickness of 0.6 μm in each case.

B-base layer:

Approximately 90% by weight of propylene homopolymer having a melting point of 162

0C and a melt flow index of 3.4 g / 10min

0.15% by weight of N, N-bisethoxyalkylamine (antistatic agent) 0.30% by weight of erucic acid amide

A cover layers: about 75% by weight of ethylene-propylene random copolymer having a C2-

Content of 4.5% by weight

about 25% by weight of ethylene-propylene-butylene random terpolymer having an ethylene content of 3% by weight and a butylene content of 7% by weight (remainder of propylene)

0.33 wt .-% SiO 2 as antiblocking agent with an average particle size of 2 microns

0.90% by weight of polydimethylsiloxane having a viscosity of 30,000 mm 2 / s

The production conditions in the individual process steps were:

Extrusion: Temperatures Base Layer: 260 ^° C

Cover layers: 240 ^° C.

Off roll temperature: 20 ⁰ C

Elongation: Temperature: 110 ⁰ C

Longitudinal stretch ratio: 5.5

Transverse: Temperature: 160 ° C

Transverse stretch ratio: 9

Fixation: Temperature: 140 ^° C.

Convergence: 20%

The film was then coated on a surface with a sealable acrylate coating.

The film was then cut to 350mm width into narrow cuts and wound up. These narrow cuts (rolls) were passed in a second step on a needled rollers and provided in the longitudinal direction of the film with perforation lines, which were arranged in parallel at a distance of 6mm. The perforation had a propeller-like shape with a length B of 4 mm. The distances between the individual perforations was 2mm. The thus perforated film was wound up into a roll of perforated film.

The perforated film was then used for a bar wrap with 12 cigarette sachets. The packets were arranged so that the edges of the packets were at the level of the perforation line. The packets could be removed by breaking along the perforation line, without causing uncontrolled crack propagation in the film. Comparative example

A single-row perforation was applied to the film described in Example 1 with a similar needle roller. The perforations were the same length and spacing as in Example 1. The film was used in the same way for the bar wrap of 12 cigarette sachets. The packaging could not be opened by breaking. When attempting to tear the film along the perforation line, 3 out of 10 attempts led to an uncontrolled tear along the perforation line.

Claims

claims

1. A biaxially oriented film roll made of polypropylene with perforation lines, characterized in that the film has at least two perforation lines, which run parallel to each other and in a

Distance of a maximum of 10mm and where the perforations of the two lines are offset from one another.

2. polypropylene film roll according to claim 1, characterized in that between the perforations distances from undamaged film and the perforations are longer or as long as the distances between the perforations.

3. Polypropylene film roll according to claim 1, characterized in that the perforations are produced by means of a needle and are circular or elliptical or propeller-shaped.

4. Polypropylene film roll according to claim 1, characterized in that the perforations are produced by means of knives and are diamond-shaped or rectangular.

5. polypropylene film roll according to claim 1, characterized in that the perforations are thin areas which have 10 to 80% of the remaining film thickness.

6. polypropylene film roll according to claim 1, characterized in that the perforations have a length of 0.1 - 8mm.

7. Polypropylene roll according to claim 1, characterized in that the length of the distances between these perforations is 10 to 95% of the length of the perforations.

8. Polypropylene film roll according to claim 1, characterized in that the center of the sections of the first perforation line is aligned with the center of the respective opposite perforations of the second perforation line.

9. Use of a perforated film roll according to claim 1 to 9 for the packaging of cylindrical or cuboid piece goods

10. Use according to claim 9, characterized in that the piece goods are cigarette packs.

11. Cigarette rod produced by the use according to claim 10.

* * * * * * *