UA115860C2 - Polypropylene film comprising an opening aid - Google Patents

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

The present invention relates to a biaxially oriented polypropylene film provided with perforations and a package made of biaxially oriented polypropylene film provided with perforations for ease of opening.

The success of biaxially oriented polymer films, in particular thermoplastic polymer films, in particular biaxially oriented polypropylene films, is based essentially on their excellent mechanical strength properties combined with relatively low weight, good barrier properties and good weldability. The polyolefin film protects the packaged product from rapid drying or, accordingly, from the loss of aromas with a very small material capacity.

The consumer's need for hygienic, externally attractive, tightly closed and wear-resistant packaging contradicts the desire for easy and controlled opening. The lack of the latter causes dissatisfaction among consumers of packaging made of polyolefin films and is considered a disadvantage compared to packaging made of paper.

Uniaxially oriented films exhibit low resistance to tearing in the direction of orientation and can be subject to tearing and further tearing under control in this direction without complications. However, the use of uniaxially oriented films is impossible for many areas, including due to insufficient mechanical strength properties in the transverse direction. Biaxial orientation creates, on the one hand, the desired high strength properties (moduli) in two directions; on the other hand, the predominant directions are also aligned. As a result, in order to open a film package (for example, a bag of cookies), a high force must first be overcome to tear the film. However, if the film is once damaged or, accordingly, torn, then the crack spreads uncontrollably even when very low tensile forces are applied. These unsatisfactory consumer properties, due to very high tear resistance in combination with very low strength during tear growth, reduce - despite the already mentioned advantages - the attractiveness of film packaging in the market of end consumers.

In the prior art, it was proposed to provide a film with a predetermined destruction site. When opening, the film breaks in this place of the specified destruction. The crack, however, often spreads very uncontrollably, because these solutions, although they facilitate the rupture, but in reality

They do not help in the controlled growth of the gap.

Another well-known possible solution is the mechanical integration of the given fracture site in the form of perforations or notches along the imaginary line of opening. But often such a perforation does not guarantee a controlled rupture. When opening, the crack only first goes along the line of perforation, and then spreads in the material, deviating in an arbitrary way.

This property of uncontrolled crack growth is particularly problematic in biaxially oriented polypropylene films, since the resistance to crack growth in this material is particularly weak. This problem is especially relevant for packages with an artificial product that is not packed in bulk, but in an orderly manner, as, for example, in cigarette blocks, flake cookies (Uueeiabih), crisp breads, pastry rolls and similar products.

These types of packaging are especially aimed at the fact that the consumer will want to take out only individual pieces first, and keep the rest in the package to take out other pieces at a later point in time. In this case, the use of uncontrollable tearing of film packaging is particularly unpleasant for the consumer.

UMO 98/2312 describes packages that are cut with a laser beam. These packages have a multi-layer construction. In particular, a metal intermediate layer is provided, which should prevent the laser beam from cutting through the film. This packaging is time-consuming and expensive due to lamination with a metal layer. The description does not say anything about the exact configuration of the package.

In addition, the perforated film must have sufficient mechanical stability so that this perforated film can be used for packaging artificial goods. The prior art describes ways in which perforation is integrated into the packaging process as a processing step. This solution prevents any mechanical stress on the perforated film, for example during winding and unwinding. Perforation integration is possible, however, not for all packaging processes. On the one hand, the spatial conditions in the existing installation are often such that there is simply no place to embed such a device. Furthermore, packaging processes in the cigarette industry proceed at very high speeds, which may be too fast for perforation. Therefore, it is not always possible to integrate a device for perforating the film into the unit for wrapping cigarette pack blocks. Sufficient mechanical stability of the film contradicts, however, the simultaneous desire for an easier-to-open package.

It is therefore an object of the present invention to provide an improved packaging for an ordered artificial product.

The problem set as the basis of the invention is solved with the help of a package made of a biaxially oriented polypropylene film that contains an artificial product, while the film is provided with at least two perforation lines that run parallel to each other and are at a distance of no more than 10 mm, and the perforations of these two lines are located with an offset relative to each other.

This task is also solved using the method of wrapping artificial goods, in which the perforated film is unwound from the roll and used for packaging artificial goods.

In fig. 1 shows one of the variants of the implementation of the film (2) provided with round perforations (1) with a length (diameter) of B. The length of the distance between the perforations corresponds to the length of A. Two perforation lines that run parallel and are located at a distance of C from each other. In the embodiment shown in fig. 1, distances A have the same length as the length of perforations B. The perforation lines are offset relative to each other so that the middle of each perforation is on the same line as the middle of the opposite distance.

In fig. 2 shows a film equipped with circular perforations, the length of which is greater than the distance A.

In fig. Perforations with a rectangular geometry are shown, while here also B»2A.

In fig. 4 shows a film with diamond-shaped perforations, which, for example, are formed with the help of rotating knives.

In fig. 5 shows a film with elliptical perforations. There is also V»A.

In fig. 6 shows a possible geometry of perforation with needles, in which perforations in the form of a propeller are formed.

In fig. 7 shows a strip of film which is provided with several double lines of perforation in the longitudinal direction.

In fig. 8 shows the packaging (3) of artificial goods, which is opened by breaking along the double line (4) of the perforation.

In all these embodiments shown in fig. 1-8, the general thing is that the distances A between

With perforations have the same size or less than the length B of the perforations themselves.

Two offset perforation lines, which run in parallel, form a predetermined fracture site in the film, in which the crack spreads in a very controlled manner after rupture. The crack after rupture continues under control along one of the perforation lines or between two parallel perforation lines. The film packaging is opened only as much as it is desired.

The packaging proposed by the invention is intended, in particular, for ordered or stacked artificial goods, for example, cigarette packs, as well as for pasty packaged products, such as butter, sausage and the like. The consumer gets the opportunity to tear the film along the given place of the given destruction in such a way that it is possible to take out individual pieces, without the uncontrollable falling out of other elements in the case of an artificial product. Individual segments between parallel perforation lines are selected according to the size of the drawn element. At the same time, it is possible to manage the convenient extraction of one or more elements at one opening.

Perforation lines can be made on a strip of film according to the appropriate pattern. These lines are mostly straight. However, it is also possible to draw a line of any geometric shape, so that the place of the specified destruction later corresponds to this shape and dimensions of the packaged artificial product.

Perforation lines can be created by mechanical perforation, for example with needles or knives or with a laser beam or otherwise, so that a through hole is formed in the film. Perforations in the meaning of this invention, however, also mean thin places in which a through hole is not formed in the film, but the film only becomes thinner in the corresponding places due to the removal of material, for example, with the help of a laser beam that only reaches a given depth. In these embodiments, up to 10 to 80 95 of the original film thickness, preferably 20 to 6095 of the original film thickness, remain in the thin spot region. Thus, a closed package is stored, which also meets all hygienic requirements, and the barrier properties of which do not deteriorate.

Along the line of perforation, behind the holes, cuts or thin places (perforations B), there are alternately undamaged sections of the film, the length A of which is given by the distance between the perforations. These distances in the meaning of this invention represent, thus, areas of intact film that extend from the end of one perforation to the beginning of the next perforation along the same perforation line.

The geometric shape of the perforation can vary and depends on the perforation method. Needles or rotary knives can be used for perforation. For lines of perforation consisting of non-intersecting thin areas, laser or ultrasound are preferred. When perforating with needles, round or elliptical or propeller shapes are formed, which arise due to the fact that the needles and the film during perforation are in contact and move relative to each other. When perforating with knives, more rectangular or diamond-shaped incisions or thin places are formed.

Laser and ultrasonic methods make it possible to obtain various geometric shapes. In addition to round perforations, all perforations have a longer length in one of the two main directions (longitudinal direction), which is oriented along the perforation line.

These perforations in the specified longitudinal direction generally have a length of B, which is equal to 0.1-8 mm, preferably from 0.3 to b mm, in particular, from 0.5 to 3 mm. The length of perforations across this direction is correspondingly smaller and generally ranges from 5 to 80°, preferably up to 10 to 50° of their length in the longitudinal direction. This applies not only to round perforations. Round and approximately round perforations have a diameter equal to 0.1-6 mm, preferably from 0.3 to 5 mm, while in this case the diameter corresponds to the length B of the perforation.

For a particularly low breaking force, perforations with a length of 1 to 6 mm are preferred, in particular, lengths of 1.5 to 6 mm or 2 to 4 mm are also suitable. Surprisingly, even with these relatively large or long perforations, the mechanical strength properties of the film do not deteriorate. These variants of implementation can also be perfectly wound to obtain a roll of film and unwound again in the packaging machine without complications.

The length A of the sections, that is, the undamaged film between the perforations, is from 0.05 to 8 mm, preferably from 1 to 6 mm. For embodiments with long perforations of, for example, 1.5 to 6 mm, preferred distances are 24 to 10 mm. The dimensions of the distances A are chosen relative to the length B of the perforations so that this length B of the perforations is at least the same size or larger than the distances A. In general, the length or

The diameter of the perforation is at least 10 95 greater than the length of these distances. In the general case, the length A of the distances 10 is from 10 to 90 956 the length B of the perforations, preferably from 20 to 85 95.

The specified dimensions of perforations and distances apply equally to perforations in the form of non-crossing thin places, which, for their part, can be made round, elliptical or oblong in the same way.

Along one line, the dimensions of the distances between the perforations are generally constant, or vary only to a small extent within the limits of the usual manufacturing accuracy. In the same way, the size of individual perforations along one line does not vary or varies only to a small extent (up to 10 95), that is, for example, the diameter of the holes or the length of the perforation is constant. Similarly, the perforations and the distances of both parallel lines of perforation are provided with a place of given destruction of approximately the same size.

For the invention, it is essential that the predicted location of the specified destruction is formed from two perforation lines running parallel, which are located at a distance C equal to no more than 10 mm. Preferably, the distance C between these two lines is from 0.5 to 8 mm, in particular from 0.8 to 5 mm.

The second important feature for the invention of the place of the specified destruction is the location of the perforations of two lines of perforation that run parallel to each other. It turned out that the offset arrangement of the perforations of these two lines unexpectedly improves the crack propagation control. With this offset location, the perforation of the second line does not start at the same height as the opposite perforation of the first line. Thanks to this, the perforation of the second line at least partially overlaps the distance of the first line of perforation. In preferred embodiments, in particular those in which the perforations are at greater distances, sections of one perforation line are completely overlapped by perforations of opposite lines.

In one of the preferred embodiments, the middle of the sections of the first line of perforation is on the same line as the middle of the corresponding opposite perforations of the second line of perforation, so that a symmetrical pattern of perforation is obtained.

Unexpectedly, the arrangement of two parallel, offset perforation lines significantly improves crack control. The invention also makes it possible to break the package at the place of the specified destruction along the edges of the artificial product, if this artificial product has the appropriate mechanical stability, and the artificial product is located in the package so that its edge passes at the height of the double line.

Perforation lines are generally located in the direction of movement of the film in the machine.

Perforation can be simultaneously combined with cutting the film into films of a narrower width and thus be performed in one working step. Alternatively, the perforation can also be carried out before or after cutting to the width of the finished film. In all these variants of the method, the film for the purpose of its perforation can, for example, be directed along rollers equipped with appropriate perforation tools, for example, these rollers can be equipped with needles or knife blades. In the case of laser or ultrasonic perforations, the corresponding tools are located below or above the film strip. In these methods, the film intended for perforation is unwound from the roll, the perforations proposed by the invention are performed, and then the perforated film is rewound, and this roll is used in artificial goods packaging facilities, that is, it is unwound and used for wrapping goods. Unexpectedly, the perforations do not impair or only marginally impair the winding properties of the film, so that the perforated film can be wound and unwound using conventional devices. Unexpectedly, it also turned out that the perforation proposed by the invention does not impair the mechanical stability of the film in such a way that film breaks, film tears, thickening or stretching occur during unwinding and winding.

A roll of perforated film is used to manufacture the packaging proposed by the invention. The packaging proposed by the invention is intended, in particular, for ordered or stacked artificial goods, as well as for pasty packaged products such as butter, sausage and the like. The consumer gets the opportunity to tear the film along the given place of the given destruction in such a way that it is possible to take out individual pieces, without the uncontrollable falling out of other elements in the case of an artificial product. Individual segments between parallel perforation lines are selected according to the size of the drawn element.

At the same time, it is possible to manage the convenient extraction of one or more elements at one opening.

Biaxially oriented polypropylene film is generally used as a film.

This film can, depending on the type of packaging, be translucent to transparent or non-transparent. "Opaque film" means, in the meaning of this invention, an opaque film, the light transmittance (AZTM-ЮО 1003-77) of which is no more than 7095, preferably no more than 50 95. This film can, in principle, have a single-layer or multi-layer construction. For the packaging proposed by the invention, laminates are also suitable, which mainly consist of the films described here.

For transparent embodiments, the formulation of the film and the type of laser can be selected in accordance with each other so that the laser beam leaves a white or colored line in the area of thinning. At the same time, the package later acquires a recognizable marking and indicates to the consumer where the crack should pass to open the package so that it is convenient to handle it.

Possible thermoplastic polymer materials for the film are polyolefins from olefin monomers with a number of C atoms from 2 to 8. Propylene polymers, ethylene polymers, butylene polymers, cycloolefin polymers or mixed polymers of propylene, ethylene, butylene units or cycloolefins are especially suitable. In general, the layers of the film, or, accordingly, the layer for single-layer variants of implementation, contains at least 50 wt. 956, mostly from 70 to 99 weights. 9o, in particular, from 90 to 98 weights. 9o thermoplastic polymer, in each case relative to the weight of the layer.

As polyolefins, propylene polymers are preferred. These propylene polymers contain from 90 to 100 wt. 96, preferably from 95 to 100 weights. 95, in particular, from 98 to 10 wt. 956 of propylene and have a melting point equal to 120 "C or higher, preferably from 130 to 170 "C, and in general the melt flow rate is from 0.5 g/10 min to 15 g/10 min, preferably from 2 g/10 min to 10 gH/10 min, at 230 "C and a force equal to 21.6 N (SIM 53 735). Wear-resistant homopolymer of propylene with an atactic fraction equal to 15 wt. 95 and less, copolymers of ethylene and propylene with an ethylene content of 10 wt. 95 or less, copolymers of propylene with C4-Cv-olefins with an olefin content of 10 wt. 95 or less, terpolymers of propylene, ethylene and butylene with an ethylene content of 10 wt. 95 or less and with a butylene content of 15 wt. 95 or less are preferred propylene polymers for the core layer, with an isotactic propylene homopolymer being particularly preferred.

In addition, a suitable mixture of the mentioned homo- and/or copolymers and/or terpolymers of propylene and other polyolefins, in particular, of monomers with the number of C atoms from 2 to 6, and this mixture contains at least 50 wt.95o, in particular, at least 75 wt. 90 propylene polymer.

Other suitable polyolefins in the polymer blend are polyethylenes, in particular, NORE (HDP, high density polyethylene, low pressure polyethylene), HORE (PVT, low density polyethylene, high pressure polyethylene), MORE (PEDNG, very low density polyethylene) and GGORE (LPENG , linear polyethylene of low density), and the share of these polyethylenes does not exceed 15 weight in each case. 95 relative to a mixture of polymers.

If necessary, one layer, preferably the main layer or the intermediate layer, of the film for non-transparent variants of implementation may additionally contain pigments and/or vacuole-initiating particles in the appropriate amounts.

The film proposed by the invention can be single-layered, preferably this film is multi-layered. For this, an intermediate layer and/or cover layers can be applied on one or both sides of the base layer. Accordingly, multi-layered versions of the film along with the main layer, if necessary, include intermediate layers and covering layers.

These additional cover layers and/or intermediate layers generally consist of polyolefins. They contain at least 70 weights. 95, preferably from 75 to 100 weights. 95, in particular, from 90 to 98 weights. 95 polyolefin. As polyolefins for these additional layers, the same polymers described above for the main layer are suitable, in principle.

For covering layers, the following are suitable: copolymer of ethylene and propylene or ethylene and butylene, or propylene and butylene, or ethylene and another olefin with the number of carbon atoms from 5 to 10, or propylene and another olefin with the number of carbon atoms from 5 to 10, or ethylene terpolymer and propylene and butylene or ethylene and propylene and another olefin with the number of carbon atoms from 5 to 10, or

From a mixture or composition of two or more named homo-, copolymers and terpolymers.

Among them, static ethylene-propylene copolymers with an ethylene content of 2 to 10 wt are especially preferred. 95, preferably from 5 to 8 weights. 95, or static propylene-butylene-1-copolymers with a butylene content of 4 to 25 wt. 96, preferably from 10 to 20 weights. 95, respectively, relative to the total weight of the copolymers, or static ethylene-propylene-butylene-1 terpolymers with an ethylene content of 1 to 10 wt. 956, mostly from 2 to 6 weights. 95, and the content of butylene-1, equal to from 3 to 20 wt. About, mostly from 8 to 10 weights. 95, respectively, relative to the total weight of terpolymers, or a composition of ethylene-propylene-butylene-1-terpolymers and propylene-butylene-1-copolymers with an ethylene content of 0.1 to 7 wt. 95 and a propylene content of 50 to 90 wt. 95 and the content of butylene-1, equal to from 10 to 40 wt. 95, respectively, relative to the total weight of the polymer composition.

The copolymers or terpolymers described above generally have a melt flow rate of 1.5 to 30 g/10 min, preferably from 3 to 15 g/10 min. The melting point is in the range from 120 to 140 "C. The composition of copolymers or terpolymers described above has a melt flow rate of 5 to 9 g/10 min and a melting point of 120 to 150 "C . All of the above melt flow rates are measured at 230 "C and a force equal to 21.6 N (SIM 53 735). Layers of co- or terpolymers form mainly cover layers of heat-welded variants of film production.

The total thickness of the film can vary widely and is based on the planned purpose of application. Preferred embodiments of the film have a total thickness of 5 to 250 microns, preferably 10 to 10 microns, in particular, 20 to 80 microns.

The main layer in the meaning of this invention is the layer that is more than 50 95 of the total thickness of the film. Its thickness comes from the difference between the total thickness and the thickness of the applied covering and intermediate layer/layers and therefore, similarly to the total thickness, it can vary widely. The covering layers form the outermost layer of the film and are from 0.5 to 5 μm, preferably from 1 to 3 μm. The intermediate layer is from 1 to 20 60 μm, preferably from 1 to 10 μm.

In order to further improve certain properties of the polypropylene film proposed by the invention, both the main layer and the intermediate layer/layers and the covering layer/layers may contain additives in a correspondingly effective amount, preferably hydrocarbon resin and/or antistatic agents, and/or antiblocking agents, and/ or emollients, and/or stabilizers, and/or neutralizing agents, which are compatible with the polymers of the core layer and the covering layer/layers, with the exception of, as a rule, incompatible anti-blocking agents.

Films are produced by the well-known extrusion method. In this method, the melts corresponding to the individual layers of the film are extruded through a slotted head.

The film obtained in this way is drawn with one or more rolls and cooled for the purpose of strengthening. The temperature of the drawing roll or rolls is from 10 to 90 "C, preferably from 20 to 60 "C.

Then the film is subjected to biaxial stretching. Biaxial stretching can be performed synchronously or sequentially, with sequential biaxial stretching, in which stretching occurs first longitudinally (in the direction of the machine) and then transversely (perpendicular to the direction of the machine), being particularly preferred. In the longitudinal direction, stretching occurs preferably with a multiplicity from 3:1 to 7:1 and at a temperature equal to less than 140 "C, preferably in the range from 125 to 135"C. In the transverse direction, stretching occurs mainly with a multiplicity from 5:1 to 12:1, at a temperature equal to more than 140 "C, preferably at 145-160 "C. Longitudinal stretching is expedient to be performed with the help of two rolls that move at different speeds in accordance with the given stretching ratio, and transverse stretching with the help of a corresponding widening frame. In principle, stretching for the purpose of biaxial stretching can also be carried out synchronously in the longitudinal-transverse direction. These methods of synchronous stretching are actually known from the prior art.

For thermal fixation (heat treatment), the film is then held for approximately 0.5 to 10 seconds at a temperature equal to 110 to 150 "C. If necessary, as mentioned above, after biaxial stretching, one or both surfaces of the film may be treated crowning or flame according to one of the known methods.

If necessary, after production, but before perforation, the film with the help of others

Among the processing steps, it can be laminated, coated, melt coated, varnished or laminated to give the film other superior properties. Composites of polypropylene films and polyethylene films are especially preferred as laminates. This kind of composites can be made by laminating individual films. Another technically superior option for the production of PP/LE laminates is an extrusion coating of appropriate polyethylene on a biaxially oriented polypropylene film.

Extrusion coatings of this kind are actually known in the prior art. It turned out that laminates with

PP/TGE films are preferred for laser processing and are less prone to false perforation.

The package offered by the invention is characterized by controlled bursting properties. If necessary, the force required to initiate tearing at the edge of the film can be reduced with the help of serrations, preferably M-shaped. The expansion of the packing gap can be done significantly easier and more under control. In addition, it also has all the advantages that conventional film packaging has, such as high mechanical strength, barrier properties with respect to water and oxygen, and good appearance properties.

The application of the packaging proposed by the invention is especially preferable for artificial goods, in particular, for stacked elements, such as, for example, cookies, cigarette packs or pressed briquettes of food products.

The film provided by the invention, provided with perforation, allows you to get an original packaging solution for cigarette blocks. Packs of cigarettes are stacked and wrapped in the film proposed by the invention, provided with perforation. These cigarette blocks can then be opened at the point of predetermined destruction by breaking along the line of perforation.

The invention is explained in more detail in the following examples.

EXAMPLE 1

By means of coextrusion and subsequent stepwise orientation in the longitudinal and transverse direction, a translucent three-layer ABA film with a symmetrical structure, with a total thickness of 20 μm, was produced. The covering layers had a thickness equal to 0.6 μm, respectively.

Base layer B:

about 90 lbs. 96 propylene homopolymer with a melting point equal to 162 "C and a melt flow rate equal to 3.4 g/10 min, 0.15 wt. 95 M, M-bis-ethoxy-alkylamine (antistatic), 0.30 95 wt. of erucic acid amide.

Cover layers A: approximately 75 wt. 95 of static ethylene-propylene copolymer with a Cg content equal to 4.5 wt. b, approximately 25 wt.90 of static ethylene-propylene-butylene terpolymer with an ethylene content equal to 3 wt. 905, and a butylene content equal to 7 wt. 95 (residual propylene), 0.33 wt. 95 5iOg as an anti-blocking agent with an average particle size equal to 2 μm, 0.90 wt. 95 polydimethylsiloxane with a viscosity equal to 30,000 mm/s.

The manufacturing conditions in individual steps of the method were as follows.

Extrusion: temperatures: main layer: 260 "C, covering layers 240 "C, temperature of the draw roll: 20 "C.

Longitudinal elongation: temperature: 110 "С, multiplicity of longitudinal elongation: 5.5.

Transverse tension: temperature: 160 "С, multiplicity of transverse tension: 9.

Fixation: temperature: 140 "С, convergence: 20 95.

Then the film was covered on one surface with a heat-welded acrylate coating.

Then the film was cut into narrower blanks with a width equal to 350 mm and wound.

These narrow blanks (rolls) in the second work step were directed along a roll equipped with needles and at the same time provided with perforations in the longitudinal direction of the film, which were located in parallel at a distance equal to b mm. The perforations had the shape of a propeller with a length B equal to 4 mm. The distance between individual perforations was 2 mm. The film perforated in this way was wound into a roll of perforated film.

The film perforated in this way was then used to wrap blocks containing 12 packs of cigarettes. The bundles were located so that the edges of the bundles were at the height of the perforation line. The bundles could be removed by breaking along the perforation line, without uncontrolled propagation of the crack in the film.

Comparative example

On the film described in example 1, single-row perforation was performed with the same roller with needles. The perforations had the same length and the same distances as in example 1. The film was used in the same way to wrap blocks of 12 packs of cigarettes. The package could not be opened by breaking. When trying to tear the film along the perforation line in C, uncontrolled growth of the tear occurred next to the perforation line in 10 attempts.

Claims (8)

FORMULA OF THE INVENTION 1. A roll of biaxially oriented polypropylene film for packing blocks and/or packs of cigarettes, equipped with two perforation lines that run parallel to each other and are at a distance (C) of no more than 10 mm, and the perforations (1) of these two lines are located with offset relative to each other, which differs in that between the perforations (1) there are distances (2) of intact film, and the perforations (1) are longer or have the same length as the distances (2) between the perforations (1), and the perforations (1) are thin places, the thickness of which is from 10 to 80 95 of the thickness of the rest of the film. 2. The roll according to claim 1, which is characterized by the fact that the perforations (1) are formed with the help of a needle and have a round or elliptical shape or a propeller shape. Z. Roll according to claim 1, which is characterized by the fact that the perforations (1) are formed with the help of a knife and have the shape of a diamond or a rectangle. 4. The roll according to claim 1, which differs in that the perforations (1) have a length of 0.1-8 mm. 5. The roll according to claim 1, which differs in that the length of the distances (A) between these perforations (1) is from 10 to 95 95 of the length (B) of the perforations themselves. b. The roll according to claim 1, which differs in that the middle of the sections of the first perforation line is on the same line as the middle of the corresponding opposite perforations of the second perforation line. 7. Application of a roll of perforated film according to any of claims 1-6 for packing blocks and/or packs of cigarettes. 8. A block of cigarettes packed in a film unwound from a roll according to any of claims 1-6. ooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooo Fig. 1 H ooo, ooooroooooods in pksyaknya St. St. in there is no Fig. 4. Fig. 6 41 What Fig. 7 some of and Fig. 8