GB2451742A

GB2451742A - Sliding closure for packaging container

Info

Publication number: GB2451742A
Application number: GB0814194A
Authority: GB
Inventors: Herbert Bader; Matthias Perick; Sandra Rolvering
Original assignee: Nordenia Technologies GmbH
Current assignee: Nordenia Technologies GmbH
Priority date: 2007-08-06
Filing date: 2008-08-04
Publication date: 2009-02-11
Anticipated expiration: 2028-08-04
Also published as: FR2922530B1; FR2922530A1; DE102007036903A1; GB0814194D0; GB2451742B

Abstract

The invention relates to a closure system 4 for a packaging container 1 for cloth-like or sheet-like products, in particular wet wipes 2, comprising an upper film 6, a lower film 7 and a closure slide 11. The upper film 6 and the lower film 7 each have an opening 12a, 12b or a tear-open region at a narrowing, and are partially connected to one another and at a non-connected area form a pocket 10 for the closure slide 11. The closure slide 11 can be displaced in the pocket 10 between an open position and a closed position and has a widening 13 on a portion which is guided in the pocket 10. According to the invention, the width of the pocket 10 in the region through which the widening 13 passes during an opening movement of the closure slide 11 decreases to a size b1 which is smaller than the width by of the closure slide 11 at its widening 13, as a result of which the closure slide 11 bulges outwards when the widening 13 of the closure slide 11 is located at the narrowing of the pocket 10, preventing removal of the closure slide 11. The invention also relates to a packaging container 1 comprising a closure system 4 and to a method for producing closure systems 4.

Description

Description:

The invention relates to a closure system for a packaging container for cloth-like or sheet-like products, in particular wet wipes, comprising an upper film, a lower film and a closure slide, wherein the upper film and the lower film in each case have an opening or a tear-open region, are partially connected to one another and at a non-connected area form a pocket for the closure slide, wherein the closure slide can be displaced in the pocket between an open position and a closed position and has a widening on a portion which is guided in the pocket.

The invention also relates to a packaging container comprising a closure system and to a method for producing a closure system.

The cloth-like or sheet-like products may be, without restriction, lotion-impregnated hygiene wipes, cosmetic wipes or cleaning wipes. Typical examples include moist toilet paper, disposable cleaning wipes and floor wipes impregnated with a cleaning agent, and wet wipes for babycare or for cosmetic uses.

Wet wipes are held ready in a packaging container, from which they can be removed individually. In this case, the wet wipes are usually folded in an overlapping manner, so that the removal of one wet wipe also pulls out the start of the next wipe. Furthermore, the wet wipes or similar cloth-like or sheet-like products may be connected to one another prior to being removed from the -. 2 packaging container and may be arranged in the packaging container in the form of a roll or folded in a concertina-like manner. When one wipe is removed, the start of the next wipe is pulled out with it, with the two wipes then being torn apart along a separation line as a result of the tensile forces exerted during removal. In order to prevent the wipes remaining in the packaging container from drying out and/or becoming soiled after the removal of a wipe, the packaging containers usually have a closure device. There are known on the one hand simple film packagings, for example a so-called flow-wrap packaging, with a removal opening which can be re-closed by a self-adhesive label, and on the other hand packaging containers which are designed as injection-moulded parts and which have a pivotable closure cap.

A closure system having the features described in the introduction is known from the document DE 103 25 175 B4. The closure slide of the closure system placed on the outer surface of the flexible packaging container has an opening. In the open position, the openings of the lower film, of the upper film and of the closure slide are aligned, so that products can be removed from the packaging container.

A good sealing effect can be achieved by the closure system. However, after removing one wet wipe, the start of the next wet wipe may become jammed between the closure slide and the upper film or the lower film during the closing movement of the closure slide, particularly when using the closure system on a packaging container for wet wipes, so that it is impossible or at least difficult to move the closure slide into its closed position. -. 3

Against this background, the object of the present invention is to provide a closure system for packaging containers for wet wipes, which can be operated in a particularly easy and reliable manner.

Starting from a closure system having the features described in the introduction, the object is achieved according to the invention in that the width of the pocket in the region through which the widening passes during an opening movement of the closure slide decreases at a narrowing to a size b1 which is smaller than the width b of the closure slide at its widening, as a result of which the closure slide bulges outwards when the widening of the closure slide is located at the narrowing of the pocket. If the lower film and/or the upper film have a tear-open region, these must be opened at the time of first use of the closure system on a packaging container, so that openings are formed for the removal of the wet wipes. During the movement from the closed position to the open position, the closure slide is compressed laterally at its widening by the pocket tapering in the opening direction, and thus bulges outwards. At the same time, the closure slide is usually also tilted in the pocket at least slightly along its flat dimension.

Preferably, the widening of the closure slide reaches the narrowing immediately before or in the open position.

While the upper film, the closure slide and the lower film lie substantially flat one above the other in the design known from the prior art, in the embodiment of the -. 4 closure system according to the invention an intermediate space is formed between the lower film and the closure slide as a result of the outward bulging.

The intermediate space prevents the next wet wipe from being able to become jammed between an edge of the opening of the lower film and an edge of the closure slide after the removal of a wet wipe. During the closing movement from the open position to the closed position, the start of the next wet wipe is firstly folded down by the closure slide and then laid flat between the closure slide and the lower film. Jamming is reliably prevented by the embodiment according to the invention, which therefore allows particularly easy and reliable operation. Since the closure slide in the closed position usually lies flat or at least substantially flat on the lower film, a good sealing effect is achieved so that the wet wipes remaining in the packaging container after first use are protected from drying out, even after a relatively long period of storage. The distance between the open position and the closed position is selected to be large enough that, after removing one wet wipe, the entire start of the next wet wipe can be folded down.

Besides the size and shape of the wet wipes, the configuration of the opening in the lower film, the folding of the wet wipes and the arrangement of the wet wipes in the packaging container must also be taken into account for example. When the closure system is opened again, the previously folded-down start of the next wet wipe can easily be gripped and removed.

The closure slide must have sufficient strength so that it does not snap during a closing movement. The rigidity may be achieved both by the thickness of the closure slide and by the material. The closure slide, which is usually strip-shaped, is preferably punched out of a film. Suitable materials are all polyolefins, polyolefin copolymers and other film raw materials such as polyamide (PA) or polyvinyl chloride (PVC). However, preference is given to relatively stiff materials such as polypropylene (PP), polystyrene (PS), polyethylene terephthalate (PET) or cycloolefin copolymers (COC). The closure slide may in general also be formed of a multilayer laminated or coextruded film. The thickness of the closure shde is preferably more than 100 pm and, depending on the material and intended use, may even be greater than 400 pm. The closure system should preferably allow use with just one hand. It may thus be provided in one advantageous further development that the closure slide is provided with an embossing, as a result of which it is possible to reduce the contact surface area with respect to the upper film and the lower film and therefore to reduce the sliding resistance. In addition or as an alternative, a lubricant or a filler which reduces the friction may be provided as a coating or as an added substance.

In order to operate the closure slide, during use of the closure system, a first end as seen in the movement direction, which can be gripped by a user, protrudes out of the pocket. Prior to first use, the first end may be arranged in such a way that an original seal is indicated to the user. Depending on the configuration of the closure system, it may for example be provided that a relatively large force exertion, the removal of a cover or the exposure of the first end is required for first operation. The lateral widening of the closure slide may be formed for example by lateral round or triangular protrusions which are typically arranged close to a second end of the closure slide as seen in the movement direction.

The closure slide should have a high level of rigidity in the movement direction.

On the other hand, it should be possible for the closure slide to bulge outwards in the region of the widening without any excessive exertion of force. In order to make it easier for it to bulge outwards, the closure slide may have at least one line of weakening or perforation on its portion which is guided in the pocket. The at least one perforation or line of weakening preferably runs substantially in the longitudinal direction of the slide or at a slight angle to the longitudinal direction of the slide. Holes are also possible as a special embodiment of a perforation. In addition or as an alternative, the slide may also have recesses in a sub-region of its longitudinal edges, which facilitate the outward bulging.

On its edge which leads during a closing movement, the closure slide preferably has a recess which ensures reliable guidance and a reliable folding-down of a wet wipe, the start of which protrudes out of the packaging container. With particular preference, the recess is arranged in such a way that, in the open position, it is aligned with the opening in the lower film and/or the edge of the opening in the upper film, as a result of which the correct functional position is indicated to the user. The recess may be formed for example as a notch or else simply as an indentation.

In the context of the present invention, the closure system may be manufactured and held ready as a preliminary product for producing a packaging container for wet wipes, with the closure system then being attached to a bag wall at the time of production of the packaging container, for example by means of adhesive or hot sealing As an alternative, it may also be provided to integrate the closure system into a packaging container in such a way that either the upper film or the lower film is formed by a portion of a wall of the packaging container. Besides use of the closure system according to the invention on the described flexible packaging containers, it is also possible to arrange it on a rigid packaging container produced for example by deep-drawing or by injection moulding. In this case, account must be taken of the fact that, in such an arrangement, the flexibility required for the outward bulging has to be achieved solely by the configuration of the closure system and in particular of the closure slide, since the rigid packaging container itself cannot be deformed. A certain elasticity of the upper film in particular may also be advantageous in the context of the invention.

The upper film and the lower film may be formed of multilayer films which are also used as a bag film for flexible packaging containers. Preferably, the upper film and/or the lower film are of multilayer design. Suitable films include for example those which comprise multiple film layers of polyethylene terephthalate (PET) and polyethylene (PE) or biaxially oriented polypropylene (BOPP) and polyethylene (PE), laminated together by an adhesive. The upper film may in a particularly advantageous manner have a print on the inner side which is applied prior to the lamination and which is protected against abrasion by the surrounding film layers. However, in the context of the invention, the films used may also be coextruded films with a sealing layer. In this case, the upper film is preferably printed at least in sub-regions and is provided with a protective lacquer.

Particularly when the closure system as a separate preliminary product is placed on one of the walls of a packaging bag during the formation of the latter, no particular requirements are placed on the lower film, which cannot be seen.

Accordingly, it is also possible to use inexpensive films, for example polyolefin monofilms, as the lower film. In the context of the invention, the upper film, the JO lower film and the closure slide may also be designed to be transparent or translucent.

The opening or the tear-open region of the upper film may be designed as an elongate hole which preferably widens in the opening direction. The opening direction here is the direction in which the closure slide is moved during an opening movement starting from the closed position to the open position. The widening of the elongate hole facilitates the outward bulging of the closure slide and also a generally observed easy tilting of the closure slide with respect to its flat dimension in the closed position, and allows particularly easy removal of the wet wipes. In the context of an alternative embodiment of the invention, it is provided that a longitudinal slit or a perforation or line of weakening is provided as the opening or tear-open region of the upper film. If only one perforation or line of weakening is provided, an original seal is indicated to the user prior to first opening of the packaging container. At the time of first operation of the closure slide, this perforation or line of weakening, which may be formed for example by a cutting only of individual film layers by a laser, is torn open. The longitudinal slit thus formed is spread apart during an opening movement by the outward bulging of the closure slide, so that wet wipes can be removed through the opening.

When the closure slide reaches the end of the longitudinal slit, the longitudinal slit cannot be spread apart any further, so that, when the usual level of force is applied, the closure slide does not move beyond the open position and cannot be pulled out completely. The reaching of the open position is indicated to the user in this case by a sudden increase in the resistance opposing the movement of the closure slide. In order to avoid any further tearing of the longitudinal slit in the open position, said longitudinal slit may have a punched hole at this point, which ensures a uniform distribution of force. When the closure slide is arranged flat again between the upper film and the lower film in the closed position, the opening formed by the longitudinal slit is practically completely closed and can barely be seen, so that both a good sealing effect and a particularly advantageous appearance are achieved.

The opening in the lower film may be designed as a preferably round or oval hole or else as a simple slit or cross-shaped slit. In principle, it is sufficient if the opening or the tear-open region of the upper film or lower film is covered in the closed position. However, it is preferably provided that the closure slide in the closed position hides the opening or the tear-open region of the lower film and -. 10 the opening or the tear-open region of the upper film. By virtue of such a configuration, a particularly good, labyrinth-like seal is achieved.

The pocket for the closure slide is delimited laterally by the course of the connection between the upper film and the lower film, the upper film and the lower film preferably being connected by sealing seams. In order to form the narrowing having the width b1, it is provided that the pocket tapers at least partially. By way of example, the region of the pocket through which the closure slide passes may be at least partially trapezoidal. In principle, it is sufficient if only part, for example 20%, of the region passed through immediately before the open position is trapezoidal. In principle, at least one step may also be provided in each case on the lateral connections between the upper film and the lower film in the region of the pocket through which the closure slide passes, although said step must be dimensioned in such a way as to prevent jamming of the closure slide. In order to prevent the closure slide from being moved beyond the open position, a further, relatively pronounced narrowing of the pocket may be provided as a stop. In order to achieve an easy latching function in the open position and/or the closed position, the shape of the pocket at the position at which the widening is located in each case may be matched somewhat to the shape of the widening. In addition, it may also be provided that the closure slide in the open position again bears flat against the lower film due to a shape of the pocket matched to the widening of the closure slide. Advantageously, in such an embodiment, the narrowing of the pocket with the width b1 is arranged just before --11 the open position with respect to the position of the widening of the closure slide, so that the closure slide during a closing movement bulges outwards immediately, before a wet wipe can become jammed.

The invention also relates to a packaging container for wet wipes comprising the described closure system which is arranged on a wall of the packaging container.

The packaging container is preferably formed from a bag film, for example by folding and hot sealing. Such packaging containers are known in particular as so-called flow-wrap packagings. The closure system may be integrated in the flexible packaging container in such a way that a portion of a wall formed from the bag film is provided either as the lower film or as the upper film. Preferably, however, the closure systems are provided as a complete preliminary product and are attached to the bag film on one wall of the packaging container. Usually, the closure system is arranged on the outer side of the packaging container, but IS an arrangement on the inner side is not ruled out in the context of the present invention. In the case of an arrangement on the inner side, the first end of the closure slide must be guided out of the interior of the packaging container at the time of production or at the time of first opening.

When the closure system is arranged on the wall of the packaging container, attachment may take place by means of sealing or preferably by means of adhesive. With particular preference, the closure system is provided with permanent adhesive and will be peeled off from a release layer at the time of * 12 production of the packaging container. Besides the lower film, the associated region of the bag film must also have an opening or a tear-open region. For example, the lower film and the bag film may be weakened by a laser or by a perforation, with at least one of the films not being cut through completely. The tear-open regions of the lower film and of the bag film, which are connected to one another by adhesive, may additionally also be connected to the underside of the closure slide, for example by adhesive, in order to cause the weakened portion to be torn open at the time of first operation of the slide and to open the previously air-tight packaging.

The invention also relates to a method according to claim 11. Claims 12 and 13 relate to preferred further developments of the method. After forming individual closure systems by partially punching out the laminated composite, the latter can be rolled up. During the production of packaging containers, the closure systems can then be peeled off individually, like film labels, for example by tight bending, from the release layer which is designed for example as a silicone film or as silicone paper, and can be applied to a bag film. The closure systems are arranged in such a way that, wherever an opening of the lower film is provided, the bag film has a corresponding opening or a tear-open region.

The invention will be explained below with reference to a drawing which shows only an example of embodiment. In the drawing: Figs. la to ic show a packaging container with different positions of a closure slide of a closure system, Figs. 2a and 2b show a schematic plan view of a packaging container with a closure system, Fig. 3 shows a cross section along the line A-A of Fig. 2b, Fig. 4 shows a schematic plan view of a packaging container with an alternative embodiment of the closure system, Fig. 5 shows the components from which closure systems are formed for flexible packaging containers for wet wipes.

Figs. la to 4 show a flexible packaging container I in which a plurality of folded wet wipes 2 are arranged. The packaging container I is formed from a bag film 3 by folding and hot sealing, and comprises a closure system 4 which is attached by a permanent adhesive 5 to the outer side of a container wall formed from the bag film 3. The closure system 4 comprises an upper film 6 and a lower film 7 which are connected by means of longitudinal sealing seams 8 and by a transverse sealing seam 9. The non-connected area delimited by the longitudinal sealing seams 8 and the transverse sealing seam 9 forms a pocket 10 for a closure slide 11. * 14

Fig. Ia shows the closure slide 11 in a closed position, in which the closure slide lilies flat between the lower film 7 and the upper film 6. In Fig. 2a, it can be seen that the closure slide 11 in the closed position covers openings 12a, 12b, l2c in the upper film 6, the lower film 7 and the bag film 3, as a result of which a good sealing effect is achieved. Starting from the transverse sealing seam 9, the longitudinal sealing seams 8 become broader as they continue along their course, as a result of which the pocket 10, in a region through which a widening 13 of the closure slide 11 passes, reduces at least partially in a trapezoidal manner to a size b1 which is smaller than the width b of the closure slide 11 at its widening 13.

Fig. lb shows the closure slide 11 in an open position. Due to the trapezoidal tapering of the pocket 10, the closure slide 11 is compressed at its widening 13 formed by nose-shaped protrusions 14 and therefore bulges outwards. In the open position, the openings 12a, 12b, 12c are aligned with a recess 15 of the closure slide 11 designed as a notch, so that wet wipes 2 can be removed from the packaging container 1.

The wet wipes 2 are folded in the packaging container I in such a way that, when one wet wipe 2 is removed, the start of the next wet wipe 2 is pulled out with it.

Since an intermediate space is formed between the closure slide 11 and the superposed openings 12b, 12c of the lower film 7 and of the bag film 3 due to the bulging of the closure slide 11, the wet wipe 2 protruding out of the packaging container 1 can easily be folded down by a closing movement of the closure slide 11 and can be placed flat between the closure slide 11 and the lower film 7. In the process, during the closing movement, the protruding part of the wet wipe 2 is guided by the notch 15. The distance between the open position and the closed position is such that a partially protruding wet wipe 2 can be completely folded down. Depending on the design of the wet wipes 2 and of the packaging container 1, the distance may be for example between 50mm and 150 mm. The opening 12a in the upper film 6 is designed as an elongate hole, which widens in the opening direction.

In order that the closure slide 11 can easily be operated, the latter has a thickness of more than 100 pm, preferably more than 250 pm, particularly preferably more than 400 pm and is made of a relatively stiff plastic, for example PP, PS, PET or cycloolefin copolymer (COC).

It can be seen from Figs. 2a and 2b that the closure slide has, on its portion guided in the pocket 10, lines of weakening or perforations 16 which allow the closure slide 11 to bulge outwards when a small amount of force is applied. In order to prevent the closure slide 11 from being inadvertently pulled out of the pocket 10, the open position is delimited by a stop 17 which is formed by a further, pronounced tapering of the pocket 10. Both in the open position and in the closed position, an easy latching function is provided by shaped portions 18a, 1 8b of the longitudinal sealing seams 8 which match the shape of the protrusions 14.

As shown in Fig. 3, the openings 12b, 12c of the lower film 7 and of the bag film 3 are covered by a detachable label 19 prior to first use. As an alternative, instead of the openings 12a, 12b, 12c, tear-open regions may also be provided which ensure an original seal while the packaging container 1 still remains unused. As can be seen in Fig. 3, the wet wipes 2 arranged in the packaging container I overlap at their ends so that, when the uppermost wet wipe 2 is removed, the start of the next wet wipe 2 is pulled out with it from the packaging container I. Fig. 4 shows the flexible packaging container 1 with an alternative embodiment of the closure system 4 prior to first use. The closure system 4 comprises a tear-open region 12a' of the upper film 6, which is designed as a line of weakening.

The line of weakening is produced by a laser, with just one layer of the upper film 6 being weakened. At the time of first operation of the closure slide 11, the tear-open region 12a' formed by the line of weakening is opened and is spread apart when the closure slide 11 is moved into the open position. In order to avoid further tearing in the open position, a punched hole 23 is provided. In addition to lines of bending, lines of weakening or perforations 16, the closure slide 11 has lateral recesses 24 which facilitate the outward bulging. The shaped portions 1 8a' of the longitudinal sealing seams 8 which match the shape of the protrusions 14 are designed to be wide in order that the closure slide 11 in the open position is --17 arranged flat between the upper film 6 and the lower film 7. During a closing movement, the closure slide 11 bulges outwards immediately starting from the open position, before a wet wipe 2 can become jammed. During the closing movement, the wet wipe 2 that is to be laid flat is guided by a notch 15 which is designed as a recess.

Fig. 5 shows the components of which a plurality of closure systems 4 for a respective packaging container 1 are formed. During production, closure slides 11 are punched out as strips from a rigid material web transversely to the running direction, said strips having a widening 13 at one end. In order to facilitate operation of the closure slides 11, the latter are provided with perforations 16 running in the longitudinal direction of the closure slides 11 and with a notch 15 on a narrow side in the region of the widening 13. Furthermore, a first material web 20a and a second material web 20b are provided with openings 12a, 12b at an equal spacing.

The closure slides 11 are then placed on the second material web 20b in such a way that precisely one closure slide 11 is assigned to each opening I 2b. The first material web 20a is then placed onto the second material web 20b. The two material webs 20a, 20b are connected by sealing seams, as a result of which pockets 10 are formed which in each case accommodate one closure slide 11.

The sealing seams are shaped in such a way that the pockets 10 that are formed are at least partially trapezoidal in a region provided as a guide for the widening 13 of the closure slides 11. After coating the second material web 20b with a permanent adhesive 5, the connected material webs 20a, 20b and the closure slides 11 accommodated in the pockets 10 are laminated onto a release layer 21.

Individual closure systems 4, which in each case comprise an upper film 6 formed of the first material web 20a, a lower film 7 formed of the second material web 20b, and a closure slide 11 arranged therebetween, are separated along punching lines 22 which run transversely to the material webs 20a, 20b and in the longitudinal direction of the closure slides 11, with the release layer 21 not being cut through.

After forming the individual closure systems 4, the laminated composite can be rolled up. During the production of packaging containers 1, the closure systems 4 can then be peeled off from the release layer 21 and applied to a bag film 3.

Claims

Claims: 1. Closure system for a packaging container (1) for cloth-like or sheet-like products, in particular wet wipes (2), comprising an upper film (6), a lower film (7) and a closure slide (11), wherein the upper film (6) and the lower film (7) in each case have an opening (12a, 12b) or a tear-open region at a narrowing, are partially connected to one another and at a non-connected area form a pocket (10) for the closure slide (11), and wherein the closure slide (11) can be displaced in the pocket (10) between an open position and a closed position and has a widening (13) on a portion which is guided in the pocket (10), characterised in that the width of the pocket (10) in the region through which the widening (13) passes during an opening movement of the closure slide (11) decreases to a size b1 which is smaller than the width b of the closure slide (11) at its widening (13), as a result of which the closure slide (11) bulges outwards when the widening (13) of the closure slide (11) is located at the narrowing of the pocket (10).
2. Closure system according to claim 1, characterised in that the edge of the closure slide (11) which leads during a closing movement has a recess (15).
3. Closure system according to claim I or 2, characterised in that the pocket (10) is at least partially trapezoidal in the region through which the widening (13) of the closure slide (11) passes.
4. Closure system according to one of claims 1 to 3, characterised in that the opening (12a) or the tear-open region of the upper film (6) is designed as an elongate hole which preferably widens in the opening direction.
5. Closure system according to one of claims 1 to 3, characterised in that a longitudinal slit or a perforation or a line of weakening is provided as the opening or tear-open region (12a') of the upper film (6).
6. Closure system according to one of claims I to 5, characterised in that the closure slide (11) in the closed position covers the opening (12b) or the tear-open region of the lower film (7) and the opening (12a) or the tear-open region (12a') of the upper film (6).
7. Closure system according to one of claims I to 6, characterised in that the closure slide (11) has a thickness of more than 100 pm, preferably more than 400 pm, and is preferably designed as a thermoplastic film strip.
8. Closure system according to one of claims 1 to 7, characterised in that the closure slide (11) has at least one line of weakening or perforation (16) on its portion guided into the pocket (10).
9. Packaging container for cloth-like or sheet-like products, in particular wet wipes (2), comprising a closure system (4) according to one of claims 1 to 7, characterised in that the packaging container (1) is formed from a bag film (3), preferably by folding and hot sealing.
10. Packaging container according to claim 9, characterised in that the closure system (4) is attached to the bag film (3) on one wall of the packaging container (1).
11. Packaging container according to claim 9, characterised in that a portion of a wall formed from the bag film (3) is provided either as the lower film (7) or as the upper film (6) of the closure system (4).
12. Method for producing a closure system (4) for flexible packaging containers (1) for wet wipes (2), wherein strip-shaped closure slides (11) are punched out of a rigid material web in such a way that they partially have a widening (13), wherein openings (12a, 12b) or tear-open regions are formed at an equal spacing in a first material web (20a) for an upper film (6) of the closure system (4) and in a second material web (20b) for a lower film (7) of the closure system (4), wherein the closure slides (11) are placed on the first or second material web (20a, 20b) in such a way that one closure slide (Ii) is assigned to each opening (12a, 12b) or each tear-open region of the first or second material web (20a, 20b), wherein the first and the second material web (20a, 20b) are welded between the closure slides (11) placed thereon, as a result of which pockets (10) which accommodate the closure slides (11) are formed, wherein the second material web (20b) is coated with an adhesive on the side facing away from the closure slide (11) and is laminated onto a release layer (21), wherein the laminated composite formed is then punched in such a way that individual closure systems (4) which in each case comprise one closure slide (11) are formed, and in such a way as to not cut through the release layer (21), and wherein the first and the second material web (20a, 20b) are connected to one another in such a way that the pockets (10) formed are at least partially trapezoidal in a region provided as a guide for the widening (13) of the closure slide (11). * 23
13. Method according to claim 12, wherein the closure slides (11) are in each case provided with at least one line of weakening or perforation (16) and/or with a notch (15) at one of their ends.
14. Method according to claim 12 or 13, wherein the openings (12a, 12b) or the tear-open regions of the first and/or second material web (20a, 20b) are in each case covered by a peel-off label (19) as an original seal.