EP2714526B1 - Method for separating a sheet-material tube containing product stacks, packaging installation for implementing the method, and perforated tubular sheet material - Google Patents

Description

The invention relates to a method for separating a packaging bag segments containing a plurality of product stacks, in particular of hygiene products, comprising film bag segments which are in each case containing one or two product stacks. It further relates to a packaging installation for packaging products in packaging bags, in particular for carrying out the method, and to a perforated tubular film for use in such a method.

Hygiene products such as paper handkerchiefs, panty liners, sanitary napkins, diapers or the like are usually packaged individually or in predetermined batches, for example in the form of five or ten packs, in film and offered ready for consumption or ready for use in this packaged form. The film surrounding the hygiene product or the stack of hygiene products forms a so-called packaging bag, which i.a. For example, it can be equipped with a perforation for easier opening and / or with adhesive tabs or the like for resealing. Likewise, other products or product batches, such as cigarette packs or the like, can be provided with such a packaging bag in the manner of an overpack.

For introducing the product, in particular the hygiene product or the stack of hygiene products, into the packaging bag, it may be provided, for example, that suitably cut film pieces intended to form the packaging bag are provided in which the product is inserted, the film subsequently being wrapped around it and welded at the edges. Such a concept for packaging hygiene products in a packaging bag, for example, from DE 101 48 283 A1 in which a so-called cellular wheel is provided for the actual packaging step. In this case, the intended for forming the packaging bag film is first inserted into a chamber of the cell wheel, then a stack of hygiene products is also introduced into the chamber of the cell wheel. Thereafter, the side edges of the film are circumferentially overlapped around the stack of sanitary products and appropriately welded together.

Alternatively, a so-called film tube packer can be used, as he, for example, from the DE 10 2008 020 800 A1 is known. In such a system, the sanitary products or packages of hygiene products to be packaged are positioned in a so-called tubular bag machine in a film tube, which is then welded together and separated between the products.

Especially when packaging hygiene products that are produced in particularly large numbers, such as paper tissues, panty liners, sanitary napkins or the like, a high processing speed and throughput rate when packaging the products is desirable. For this reason, the packaging systems are usually designed in the manner of continuous systems. In these, the products to be packaged are conveyed consecutively, individually or in stacks along a transport direction and surrounded with the packaging bag during the passage through various system components arranged along the transport direction. In particular, the above-mentioned film tube systems are generally well suited for high processing speeds and throughput rates, since, for example, during the wrapping of the products or product stack in the tubular film to form the film tube welding of the lateral longitudinal seam from the side, ie in the run and without system standstill, is possible. In order to make use of this advantage also in the case of film tube systems in the overall process, there is an endeavor to make the subsequent processing steps suitable for correspondingly high throughput rates. This applies in particular to the separation of the packaging bags, which is necessary in film tube systems in particular, by suitable dicing of the film tube and the subsequent further welding step for welding the end faces.

From the US 4 430 844 A a film tube packer is known, are packed with the paper rolls in a film tube. In the film tube lines of weakness are formed transversely to the continuously moving path. Between the weakening lilies, the paper rolls are introduced and wrapped with the film. The continued moving at a continuous predetermined speed on a conveyor belt packages are transferred to another conveyor at a higher speed. Before this transfer, the film tube is partially severed at its line of weakness by primary crusher, so as to ensure that the tension under tension film tube is not falsely also tearing at other locations. Through the use of such a primary crusher, which strikes the tensioned film in a predetermined cycle, there is a risk, particularly for packages with opening perforation for easier opening of the packaging, that it tears at undesired locations.

The invention is therefore based on the object of specifying a method for separating a film tube containing a plurality of product stacks into packaging bag segments each containing one or two product stacks, with which particularly high throughput and production rates can be achieved. Furthermore, a packaging system which is particularly suitable for carrying out the method and a perforated tubular film which is particularly suitable for use in the method should be specified.

With regard to the method, this object is achieved according to the invention by providing the tubular film intended for forming the film tube at the intended separation points with a perforation such that the perforation associates a number of opening perforations respectively each opening perforation, each with a substantially rectilinear separation perforation comprising in its central region in a corresponding to the width of the respective opening perforation length a continuous relief section, the product stacks are then wrapped in the tubular film, containing the product stack containing film tube under frictional lateral access in a conveyor system, with a constant first transport speed, to a Separating unit is transported, in which seen in the conveying direction front packaging bag to another conveyor system with respect to he At least temporarily increased conveyor speed is transferred to the conveyor system and thereby the film tube formed is torn apart at the respectively provided separation point, wherein the transport speed of the further conveyor system is impulsively and temporarily increased upon arrival of the front seen in the conveying direction packaging bag.

The invention is based on the consideration that in order to achieve particularly high throughput and production rates a continuous and uninterrupted passage of the products or product stack through the packaging system should be sought. In order to prevent system downtimes or even short-term interruptions in the further transport of the products or product stacks as far as possible, all processing steps during the introduction of the products or product stacks into the respective packaging bags should be designed consistently for a continuous operation. The conventional methods for separating the wrapped in the film tube product stack, where the separation of adjacent packaging bag segments from each other by suitable cutting means such as cutting blades or thermal means such as welding units, but are just not suitable for this purpose. As a rule, the use of cutting means requires that positioning of the cutting means relative to the film tube initially be carried out to perform the cut, so that the separation also takes place at the desired separation point. This positioning, including the subsequent actual cutting process usually requires - on its own Precision reasons - a temporary system downtime that is detrimental to the desired high processing speed.

To counteract this, separation should therefore be based on a different concept in principle. For this purpose, it is now provided that the separation of the packaging bag segments should be carried out by tearing the film tube at predetermined separation points. For this purpose, first provided for forming the film tube tubular film in the manner of preprocessing with a suitable perforation, which ensures the rupture of the film tube at the desired separation points when creating appropriate longitudinal forces. The pre-processing for perforation of the tubular film takes place with the aid of a perforation device provided for this purpose. The pulled down from a supply roll tubular film is thereby perforated, from one side edge of the tubular film to the other side edge, across the entire film web with a continuous perforation. It can be adjusted by a control of the distance between the individual perforations to each other, so that depending on the packaged hygiene product different packaging lengths. The film tube thus always envelops the products to be packaged with a necessary film projection.

After the subsequent impact of the product stack in the thus prepared tubular film and the welding of the lateral longitudinal seam to form the film tube, the supply of the provided with the product stacks film tube is provided in a separation unit. In this, seen in the longitudinal direction of the film tube suitably selected longitudinal forces are applied, which cause a rupture of the film tube to the separation points defined by the perforation.

In order to reliably and without delay introduce the longitudinal forces required for the separation of the individual packaging bag segments into the film tube, a mechanical, frictional access to the film tube, preferably from the side, is provided in an advantageous embodiment. This can be done, for example, by conveying the product stack containing film tube in a conveyor system, attack in the conveyor belts with suitably selected, for example, rubberized surface laterally on the film tube. Preferably, the film tube is guided between a pair of such conveyor belts, so that they support each other and the film tube is guided clamped therebetween. For separation by tearing the film tube is expediently transported to a separation unit in which the seen in the conveying direction front packaging bag segment is passed to another conveyor system with compared to the first conveyor system at least temporarily increased transport speed. Due to the excess speed of the receiving conveyor system of the film tube thereby stretched in its longitudinal direction until it breaks at the weak point, namely the separation point provided by the perforation between two product stacks.

A particularly high level of reliability in the separation can be achieved by constructing the longitudinal forces required for the separation in the film tube in a particularly advantageous development, particularly in accordance with demand and preferably also synchronized with the working cycle of the corresponding packaging machine provided in any case. For this purpose, the conveying system which takes over the respective packaging bag segment to be cut off or picked up is advantageously not operated with a constant transport speed but with a variably controlled transport speed. For this purpose, the transport speed of the further conveyor system is particularly advantageous when the arrival in the conveying direction front packaging bag segment pulse-like and temporarily, preferably by about 20% - 35%, particularly preferably increased by about 25% - 30%. By means of such a comparatively abrupt increase in speed, the rupture at the separation point defined by the corresponding perforation can be promoted to a particularly large extent.

With regard to the packaging installation for packaging hygiene products in packaging bags, the stated object is achieved with the features of claim 5.

In order to ensure the separation by tearing in a particularly simple manner, the separation unit is advantageously designed as a transfer station for the incoming, under frictional lateral access in a conveyor system supplied film tube to another conveyor system compared to the first conveyor system at least temporarily increased transport speed. In a further, particularly advantageous embodiment, the separation unit also comprises a control unit for adjusting the transport speed in the further conveyor system. The control unit is expediently designed so that it needs, ie in synchronization with the system clock, the transport speed in the receiving conveyor system briefly and temporarily suitably increased upon arrival of each demolished packaging bag segment, so that jerky a corresponding longitudinal force is introduced into the film tube, the then leads to rupture at the predetermined by the perforation separation point.

Advantageously, the conveyor systems are each designed as a belt conveyor with laterally acting on the film tube or the packaging bag segments conveyor belts, the conveyor belts are guided in the region of the transfer station via pulleys.

In order to allow a particularly trouble-free operation, the pulleys are in a particularly advantageous embodiment in their dimensions and / or with respect to the distance of their axes of rotation from each other, especially in the transport direction of the products, adapted to a perforation pattern in the film tube. Preferably, the design goal of a reliable rupture of the film tube to the designated, provided by the appropriate separation perforation separation points is thereby taken into account that on the one hand the resulting by the deflection of the conveyor belts in the transfer station gap between the access areas of the conveyor systems is sufficiently large, so that the separation perforation at the moment of rupture, so the pulse-like increase in the transport speed in the second conveyor system seen in the transport direction, safely between the access areas of the conveyor systems. For this purpose, the gap between the access areas, which is variable in particular by the combination of the diameter of the deflection rollers and the distance from their axes of rotation, should be sufficiently large. On the other hand, this gap should also be sufficiently small, so that even at the moment of rupture sufficient access of the respective conveyor systems on the parts to be separated of the film tube, so both sides of the separation point a sufficiently long contact area of conveyor belt and film tube is given.

The last-mentioned aspect can be particularly significant if, in addition to the aforementioned separation perforation in the film tube, a so-called opening perforation is also provided. Such an opening perforation is used in particular if, in the finished packaged product, a facilitated opening of the packaging bag for access to the products contained therein is to be provided for the end user. This opening perforation should keep the packaging bag closed until it is opened by the end user; In particular, it should remain undamaged and unopened during the manufacturing and packaging process of the products. It thus represents a particular weak point in packaging, which is preferably taken into account accordingly in the packaging system. This is advantageously taken into account in the dimensioning and positioning of the pulleys, that at the moment of tearing the two-sided access of the conveyor belts on the respective opening perforation consistently goes and this secures so that when tearing by the corresponding lateral access of the conveyor belts, the introduction of longitudinal forces is avoided in the film tube in the region of the respective opening perforation.

With regard to the perforated tubular film, the stated object is achieved in that the perforation comprises a number of opening perforations, each of which has an arcuate contour and each opening perforation, each having a substantially rectilinear separation perforation, which in its central area is in one of the width of the respective opening perforation corresponding length has a continuous relief section. As a result of this arrangement of the respective partial perforations, the longitudinal forces introduced during tearing into the film tube can be controlled and guided in such a way that the opening perforation, which is comparatively sensitive for the above-mentioned reasons, can be spared during separation. By means of the relief cut it is avoided, in particular, that tensile stresses which are too high in the center region of the film can penetrate into the opening perforation and load it. Thus, even taking into account the relatively sensitive opening perforation reliable separation results can be achieved at high throughput rates.

The advantages achieved by the invention are in particular that a reliable separation under lateral access and thus in continuous operation and without system downtime is possible by the design of the separation or separation system for the film tube on a rupture at provided, in particular by appropriate separation perforations separation points. Thus, particularly high throughput rates in the packaging system can be achieved.

FIG. 1

eine Verpackungsanlage zum Verpacken von Hygieneprodukten,

FIG. 2

die Verpackungsanlage nach FIG. 1 im Ausschnitt mit einer Trenneinheit,

FIG. 3

die Trenneinheit nach FIG. 2 im Ausschnitt vergrößert, und

FIG. 4

ein Perforationsmuster einer perforierten Schlauchfolie.

An embodiment of the invention will be explained in more detail with reference to a drawing. Show:

FIG. 1

a packaging plant for packaging hygiene products,

FIG. 2

the packaging plant FIG. 1 in the cutout with a separation unit,

FIG. 3

the separation unit after FIG. 2 in the section enlarged, and

FIG. 4

a perforation pattern of a perforated tubular film.

Identical parts are provided with the same reference numerals in all figures.

The packaging system 1 according to FIG. 1 is intended for packaging hygiene products in packaging bags. In the exemplary embodiment, tissue handkerchiefs are to be introduced in batches, ie as a stack of individual handkerchiefs, with a batch size of ten each into a packaging bag as hygiene products. Alternatively, of course, other batch sizes, such as the packaging of three or five paper tissues in a packaging bag, or other hygiene products such as panty liners, sanitary napkins or the like, could be provided.

The packaging system 1 is designed as a so-called film tube packer, in which the paper tissues to be packaged or batch are first taken in a film tube 4. For this purpose, the packaging installation 1 comprises a feed unit 6, via which the paper handkerchiefs in the form of product stacks 8, in each case comprising ten tissue papers lying one on top of the other, are fed to a transport system 10. The feed unit 6 is designed in the exemplary embodiment two lanes, d. H. in the manner of a parallel arrangement of two feed rails 12, the product stacks 8 are fed parallel to each other to the transport system 10. This two-lane arrangement makes it possible, in particular, to bring together a plurality of transport strands for a joint further processing of the product stacks 8. This means that doubled throughput rates in packaging and in the further processing of the product stacks 8 can be achieved compared to the delivery rate of the product stacks 8 during their production.

The transport system 10 is u.a. assigned a wrapping station 14, in which in a suitable film storage, for example in the form of rolls or the like, which is provided to form the packaging bag tubular film 16 is provided. In the impact station 14, a suitably shaped form shoe 18 is provided, via which the tubular film 16 is placed around the product stack 8 transported in the transport system 10, the paper handkerchief being wrapped in the film. The form shoe 18 is designed such that the supplied tubular film completely surrounds the continuous product stacks 8, wherein an overlap of the corresponding edge regions of the film is set on the longitudinal edge of the resulting film tube 4.

The impact station 14 is provided with suitable means for local synchronization of the product stack 8 with the tubular film 16. In this case, provision is made, in particular, for the product stacks 8 to be positioned correctly relative to the tubular film 16, so that the position of the product stacks 8 satisfies the boundary conditions imposed relative to a printing applied to the tubular film 16 and / or relative to a perforation introduced therein. This can be ensured, for example, that a formed by a perforation in the tubular film 16 access opening in the packaging bag is also suitably positioned relative to the embraced in the packaging bag product stack 8.

About the transport system 10, the hygiene products to be packaged from the impact station 14 together with the surrounding tubular film 16 of a downstream first welding station 20 can be fed. The first welding station 20 has in a lateral arrangement a suitably designed, in particular designed as a welding mirror heater 22, via which the film tube 4 is heated to a sufficiently high temperature for welding. As a result of heating, the overlapping edge areas of Foil welded together, so that in the first welding station 20, the actual film tube 4 is formed. The film tube 4 thus forms a continuous wrapping of several successive product stacks 8 of tissue paper towels.

By the arrow 24, the transport direction of the product stack 8 of the paper tissues on the transport system 10 is indicated. Seen in this transport direction after the first welding station 20, a separating or separating unit 26 is provided, via which the packaging tube 28 containing the hygiene products is separated into packaging bags 28 containing one or two product stacks 8. This singling subsequently enables individualized further processing of individual product stacks 8 wrapped in the film.

After the product stack 8 has been separated, the transport system 10 opens into a deflection unit 30, in which the packaging bags 28 provided with the hygiene products are rotated relative to the transport direction by a predetermined angle of rotation 32. The angle of rotation 32 is chosen such that after the rotation, a lateral access to the not yet welded end faces 34 of the respective product stack 8-containing packaging bag 28 is possible. Accordingly, the angle of rotation 32 based on the base of the product stack 8 corresponds to the spanned from two sides of the product stack 8 angle. In the execution area, the product stack 8 has a substantially rectangular base area, so that an angle of rotation 32 of 90 ° is selected.

In the exemplary embodiment, the deflection unit 30 is designed such that in the region of the deflection unit 30 - as indicated by the arrow 36 - there is a change in the transport direction of the hygiene products on the transport system 10 by 90 °. This change of the transport direction is provided, without a change in the orientation of the product stack 8 takes place with the surrounding packaging bag 28, so that seen relative to the transport direction, the orientation of the product stack 8 in the deflection unit 30 changes by about 90 °.

From the deflection unit 30, the packaging bags 28 containing the product stacks 8 can be supplied via the transport system 10 to a downstream second welding station 38. In this second welding station 38, the welding of the end faces 34 of the packaging bag 28 takes place, wherein due to the orientation of the stack relative to the transport direction, the welding can also take place from the side. For this purpose, the second welding station 38 also includes laterally arranged heating means 40, which may be embodied, for example, as a heating mirror arranged on both sides of the product flow.

Subsequently, the transport system 10 opens into a second welding station 38 downstream cooling device in which a cooling of the freshly welded packaging bag 28 takes place.

The packaging installation 1, like its components, is designed for a particularly high throughput rate in the packaging of the product stacks 8. With respect to the separation unit 26, this design goal is taken into account by the separation or separation of the film tube 4 in individual, one or two product stacks 8-containing packaging bag 28 is designed for rupture of the film tube 4 at designated separation points. For this purpose, the film tube 4, as shown in the enlarged detail in FIG FIG. 2 can be removed, provided at the intended separation points in each case with a separation perforation 48, at the initiation of suitable longitudinal forces in the film tube 4 this tears. For the rupture of the film tube 4, the separation unit 26 is designed as a transfer station for the incoming film tube 4 from a first, forming part of the transport system 10 conveyor system 50 to another, also forming part of the transport system 10 conveyor system 52. In the conveyor systems 50, 52, the film tube 4 is guided under frictional lateral access. The conveyor systems 50, 52 are actuated via an associated control unit 54, wherein in particular the transport speeds are independently adjustable. For the intended separation or separation of the film tube 4 by tearing the control of the conveyor systems 50, 52 is carried out such that upon the transfer of the incoming from the first conveyor 50 film tube 4 to the subsequent conveyor system 52 at a suitable moment, namely, in particular if the intended separating point formed by the separation perforation 48 just between the two conveyor systems 50, 52, the transport speed of the other conveyor system 52 is pulse-like and temporarily increased. In this temporary moment, the further conveyor system 52 thus has a transport speed that is at least temporarily increased compared to the first conveyor system 50.

The transport speed of the further conveyor system 52 is preferably increased by about 20% to 35%, preferably by about 25% to 30%, when the packaging bag 28 arrives, compared to the otherwise usual transport speed.

As the enlarged view in FIG. 3 can be removed, the conveyor systems 50, 52 are each designed as a belt conveyor with laterally on the film tube 4 and the packaging bag 28 attacking conveyor belts 60. With regard to the choice of material, the conveyor belts are designed, inter alia, for a good frictional engagement with the packaging bags and, in particular with regard to their surface, suitable for the material of the tubular film customized. In particular, the friction surfaces of the conveyor belts 60 may also have a suitable coating.

In the area of the separation unit 26 designed as a transfer station, the conveyor belts 60 are guided over deflection rollers 62. The deflection rollers 62 can be designed as non-driven, follower rollers. In the exemplary embodiment, however, the deflection rollers 62 are designed as driven, controllable rollers via which the respective conveyor belt 60 is driven. For controlling and adjusting the speed profile, in particular for the short-term, temporary increase in the transport speed in the second conveyor system 52 for the purpose of rupture, the deflection rollers 62 and their drive motors are connected on the signal input side to the control unit 54.

The deflection rollers 62 are adapted in particular in their dimensions and in terms of the distance of their axes of rotation 64 from each other to the perforation pattern in the film tube 4. For the design objective of a reliable rupture of the film tube 4 at the respectively provided by the separation perforation 48 separating points in each case the positioning of the guide rollers 62 to each other is selected such that the resulting by the deflection of the conveyor belts 60 in the transfer station gap 66 between the access areas 68th , So the areas where the frictional contact between conveyor belt 60 and tubular film 16 is given, the conveyor systems 50, 52 is sufficiently large, so that the separation perforation 48 at the moment of rupture, so the pulse-like increase in the transport speed in the second conveyor system 52, safe between the access areas 68 of the conveyor systems 50, 52 is located.

For this purpose, the gap 66 between the access areas 68 is dimensioned sufficiently large. On the other hand, however, the gap 66 is dimensioned sufficiently small so that even at the moment of rupture there is sufficient and planar contact of the respective conveyor belts 60 with both parts of the film tube 4 to be separated from one another, ie on both sides of the separation point.

The tubular film 16 is suitably adapted in the manner of a specifically prepared semi-finished to the intended separation by tearing. For this purpose, the tubular film 16 has a specific predetermined perforation pattern, as in FIG. 4 is shown. At regular intervals, the separation perforation 48 is applied, which specifies the separation points for the subsequent separation of the film tube 4 in the packaging bag 28. The separation perforations 48 are in particular also suitably positioned in relation to a printing of the tubular film, so that the desired optical and aesthetic impression is produced in the finished packaging bag 28.

In addition, the perforation also has a number of opening perforations 70 each designed as a curved contour. Such an opening perforation 70 is used in particular when, in the finished packaged product, a facilitated opening of the packaging bag 28 for access to the products contained therein is to be provided for the end user. This opening perforation 70 is intended to keep the packaging bag 28 closed until it is opened by the end user; In particular, it should remain undamaged and unopened during the manufacturing and packaging process of the products. It thus represents a particular weak point in packaging.

In order to take this into account and to protect the opening perforations 70 during singulation, the perforation of the tubular film 16 assigned to each opening perforation 70 in the adjacent separation perforation 48 has a continuous relief cut 74. This is positioned in the central region of the respective separation perforation 48 and dimensioned in a corresponding to the width of the respective opening perforation 70 length. As a result of this arrangement of the respective partial perforations, the longitudinal forces introduced during tearing into the film tube 4 can be controlled and guided in such a way that the opening perforation 70, which is comparatively sensitive for the abovementioned reasons, can be largely spared during separation. By the relief cut 74 is avoided in particular that just in the middle region of the film reach high tensile stresses in the opening perforation 70 and can burden them. Thus, even taking into account the relatively sensitive opening perforation 70 reliable separation results can be achieved at high throughput rates.

LIST OF REFERENCE NUMBERS

1

packing plant

4

film tube

6

feed

8th

product stack

10

transport system

12

feed rails

14

wrapping station

16

tubular film

18

forming shoe

20

first welding station

22

heater

24

arrow

26

separation unit

28

packing bags

30

Return unit

32

angle of twist

34

front

36

arrow

38

second welding station

40

heating

48

Trennungsperforation

50.52

conveyor system

54

control unit

60

conveyor belt

62

idler pulley

64

axis of rotation

66

gap

68

access area

70

Öffnungsperforation

74

relief cut

Claims (9)

1. Method for separating a film tube (4) containing a plurality of product stacks (8), in particular of hygiene products, into packaging bags (28) each containing one or two product stacks (8), in which

   - the tubular film (16) provided for forming the film tube (4) is provided with a perforation at separation points provided therefor such that the perforation comprises a number of opening perforations (70) each formed in the shape of an arc and a substantially straight separation perforation (48) which is assigned to each opening perforation (70) in each case and comprises, in the central region thereof, a continuous relief cut (74), the length of which corresponds to the width of the particular opening perforation (70),

   - the product stacks (8) are subsequently wrapped in the tubular film (16),

   - the film tube (4) containing the product stacks (8) is conveyed, while being frictionally gripped at the sides in a conveyor system (50), to a separating unit (26) at a constant first transport speed, in which separating unit the packaging bag (28) which is at the front when viewed in the conveying direction is transferred to an additional conveyor system (52) at a transport speed which is faster than that of the first conveyor system (50), at least at certain times,
   and as a result the film tube (4) containing the product stacks (8) is torn apart at each of the separation points provided,

   wherein, when the packaging bag (28) which is at the front when viewed in the conveying direction reaches the additional conveyor system (52), the transport speed thereof is increased temporarily and in a pulsed manner.
2. Method according to claim 1, wherein, when the packaging bag (28) reaches the additional conveyor system (52), the transport speed thereof is increased by approximately 20 % to 35 %, preferably by approximately 25 % to 30 %.
3. Method according to claim 1, wherein, after separation, the packaging bags (28) in the additional conveyor system (52) are conveyed further to the next processing step at the constant first transport speed.
4. Method according to claim 1, wherein the product stacks (8) are fed to the tubular film (16) at predetermined intervals corresponding to the length of the packaging.
5. Packaging system (1) for packing products, in particular hygiene products, into packaging bags (28), in particular for carrying out the method according to any of claims 1 to 4, comprising a film store in which a tubular film (16) provided for forming a film tube (4) is held and which is provided with a perforation at separation points provided therefor such that the perforation comprises a number of opening perforations (70) each formed in the shape of an arc and a substantially straight separation perforation (48) which is assigned to each opening perforation (70) in each case and comprises, in the central region thereof, a continuous relief cut (74), the length of which corresponds to the width of the particular opening perforation (70), and comprising a transport system (10), by means of which a film tube (4) which contains a plurality of product stacks (8) and is formed by the tubular film (16) can be fed from a first welding station (20) to a second welding station (38), wherein, when viewed in the transport direction of the products, a separating unit (26) for separating the film tube (4) into packaging bags (4) each containing one or two product stacks (8) is arranged between the first and the second welding station (20, 38), which separating unit is designed to tear the film tube (4) at the separating points provided therefor, wherein the separating unit (26) is formed as a transfer station for the arriving film tube (4) which, while being frictionally gripped at the sides in a conveyor system (50), is fed to an additional conveyor system (52) at a transport speed which is faster than that of the first conveyor system (50), at least at certain times, and wherein, when the packaging bag (28) which is at the front when viewed in the conveying direction reaches the additional conveyor system (52), the transport speed thereof is increased temporarily and in a pulsed manner.
6. Packaging system (1) according to claim 5, the separating unit (26) of which comprises a control unit (54) for adjusting the transport speed in the additional conveyor system (52).
7. Packaging system (1) according to either claim 5 or claim 6, the conveyor systems (50, 52) of which are each formed as belt conveyors having conveyor belts (60) which touch the sides of the film tube (4) or the packaging bags (28), wherein the conveyor belts (60) are guided in the region of the transfer station by means of deflection rollers (62).
8. Packaging system (1) according to claim 7, wherein the deflection rollers (62) are adapted to a perforation pattern in the film tube (4) in terms of their dimensions and/or the spacing between their axes of rotation (64) when viewed in the transport direction.
9. Perforated tubular film (16), in particular for use in a method according to any of claims 1 to 4, the perforation of which comprises a number of opening perforations (70) each formed in the shape of an arc and a substantially straight separation perforation (48) which is assigned to each opening perforation (70) in each case and comprises, in the central region thereof, a continuous relief cut (74), the length of which corresponds to the width of the particular opening perforation (70).

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