EP2263949B1 - Side gussetted bag made of plastic film and method for its manufacture - Google Patents

Description

The invention relates to a gusseted bag made of plastic film, which is closable after a bag filling at its upper edge of the bag by means of a top seal to a package closed on all sides, with
a front wall and a rear wall,
V-shaped inserted gussets, which are connected at longitudinal edges with the front wall and the rear wall, and
a reclosure, the bag inside arranged on a gusset and adjacent inner bag surfaces of the front wall and the rear wall, and is designed as a Velcro fastener,
wherein, to open the package, a bag section above the reclosure is separable along an opening line, and wherein the gusset terminates above the opening line. In particular, the invention relates to a flat gusseted bag which is provided as a prefabricated product for subsequent bag filling. However, gusseted bags, which are shaped, filled and closed indirectly, are also included.

The plastic film may consist of a monofilm, a co-extrusion film or a multilayer composite film. As a rule, the plastic film is multi-layered and has a printable outer layer and a sealable inner layer on the inside of the bag. The front wall, the rear wall and the V-shaped inserted gussets can be formed by folding a film tube or by folding a flat sheet of material. The Longitudinal edges are designed here as folding edges and can be reinforced by longitudinal sealing seams. However, it is also within the scope of the invention to manufacture parts of the gusseted bag from separate material webs and to later combine the webs of material and to connect them by means of sealing seams. The opening line can be used as a weakening line, z. B. in the form of a perforation, be formed. In addition, a weakening line can also be generated by a laser. However, the term "opening line" also includes simple markings in the form of a cutting line along which the packaging can be opened with scissors or a knife.

A bag package of a gusseted bag with the aforementioned features is made WO 2004/092025 A2 known. The reclosure consists of a closure strip that extends horizontally without interruption from the front wall of the gusseted bag over the inner surface of a gusset to the back wall. To open the bag package for the first time, a bag section including a part of the side fold along a line of weakness can be separated. The weakening line has a horizontal and a vertical section. This form complicates the handling, since the pulling direction must be changed when separating the bag section. After the separation of the bag section remains above the reclosure an opening between the rear wall and the front wall, which can not be closed. The function of reclosure is thereby impaired.

According to the WO 2007/047393 A2 For example, the reclosure function can be improved by connecting the rear wall and the front wall together by an additional sealing seam extending from the upper edge of the bag to the rear end of the reclosure. However, this additional sealing seam obstructs the inflow of the filling material to the pouring opening.

The DE 201 06 175 U1 describes a side gusseted bag with Velcro strips which are arranged on the inside of the front wall and the rear wall of the bag and extend over the entire bag width. Additional Velcro strips may be provided on the inner surfaces of the gussets. As a result, a maximum resealable opening at the head of the bag is created. For high fill weight packaging, metered product removal is difficult.

The FR 2 816 597 A1 discloses various embodiments of pouches having at its head end or in the area of a gusset equipped with a Velcro strips Füllgutentnahmeöffnung. The Velcro strip of the reclosure has a uniformly shaped and adhering to itself adhesive surface of mutually engageable in engagement locking members.

The WO 2008/145164 A1 relates to a gusseted bag with the features described above and the features of the preamble of the independent claims 1 and 18. The reclosure is composed of four Velcro portions arranged inside the bag on the front wall, the rear wall and both edges of the gusset. The hook-and-loop fastener sections fastened to the front wall and the rear wall are arranged in an upper bag corner and form a re-closure in the region of the inserted side fold with the hook-and-loop fastener sections arranged on the adjacent flank of the side fold.

In all known designs, the velcro strip forming Velcro strips are arranged horizontally and extends the opening line to Opening the bag package substantially horizontally to the reclosure. After opening the package, the gusset can be pulled out and used as a chute for pouring the contents. The length of the chute is determined by the width of the gusset. When pulling the gusset, the upper boundary of the chute tilts down due to the interaction of the film surfaces. The result is a chute of limited bulk length, which is angled downwards. The function of the chute is not yet fully satisfactory.

Against this background, the invention has for its object to provide a gusseted bag for a bag packaging, which has a resealable pouring opening in a gusset, which forms a far projecting chute with auspicious Ausgesßeigenschaften when pulling out the gusset. The pouch packaging should be easy to open and characterized by good reclosing properties.

The object of the invention and solution of the problem is a gusseted bag according to claim 1.

According to the attached to the front wall and the rear wall Velcro portions are arranged in an upper bag corner and extend diagonally from the side fold delimiting the longitudinal edges to a provided for the top seal seam surface on the upper edge of the bag, wherein in the region of the inserted gusset reclosure with the form the adjacent edge of the side gusset Velcro sections. Preferably, the hook-and-loop fastener sections extend beyond the gusset area into the bag area between the inlaid gussets and form a reclosure between the front wall and the back wall, thereby providing a closure particularly large filling opening can be achieved. The Velcro sections have a wide adhesive surface, which is characterized by a good adhesion. Production-related tolerances in the positioning of the Velcro sections on the plastic film are harmless for the function of the reclosure. The reclosure is easy and practical to handle. Due to the fact that the hook-and-loop closure sections extend from the longitudinal folds delimiting the side fold to the top seal seam of the packaging, an effective reclosure of the entire filling opening is ensured after the pouch packaging has been opened for the first time. The bag packaging can also be opened very easily by separating a bag corner above the reclosure. In the simplest case, the bag corner can be separated parallel to the reclosure with a knife or a pair of scissors or demolished along a line of weakness. The gusset ends above the opening line and preferably extends to the upper edge of the bag. When removing the bag corner, the inserted side fold is cut obliquely. Thereafter, the gusset can be pulled out as a chute, wherein the cut or severing line forms the upper edge of the chute. Characterized in that the inserted gusset has been cut obliquely, the upper edge of the gusset is longer than the width of the gusset and results in a chute, which protrudes far in the extended state and is characterized by good Ausgesßeigenschaften.

The Velcro sections are preferably each formed by a separate Velcro strips, so that the reclosure has four separate Velcro strips.

The velcro portions arranged on the front wall and the rear wall and the longitudinal edges of the gusseted bag underneath the reclosure enclose an angle between 120 ° and 150 °. Preferably this angle is 135 °, so that the Velcro strips are at an angle of 45 ° to the upper edge of the bag.

Within the scope of the teaching according to the invention, any embodiments of hook and loop fastener sections can be used. A first embodiment of the teaching according to the invention provides that two hook-and-loop closure sections of the reclosure have an adhesive surface with hook elements and two hook-and-loop closure sections an adhesive surface with loops. The differently formed Velcro portions are alternately arranged on the inner surfaces of the front wall, the rear wall and the surfaces of the side folds that always an adhesive surface with hook elements and an adhesive surface with loops facing each other. According to a second, preferred embodiment of the invention, Velcro closure sections are used for the reclosure, which have a uniformly shaped and self-adhering adhesive surface of mutually engageable snap-in locking members. The adhesive surface of the hook-and-loop fastener sections expediently has a width of between 3 mm and 15 mm, regardless of their specific configuration. With increasing width of the adhesive surface, the reclosure can be handled more easily.

The opening line in the form of a mark for opening the package by means of scissors or in the form of a line of weakness for tearing off a bag section is arranged in the bag corner above the reclosure and extends in the simplest case on the front wall and the rear wall parallel to the hook and loop fastener sections. An alternative embodiment provides that the opening line arranged in the bag corner above the reclosure at the longitudinal edge of the bag has a greater distance from the adjacent hook-and-loop fastener sections than at the upper edge of the bag. Such an embodiment causes the unfolded Schütte protrudes at a shallower angle and the delivery of goods more over the top of the chute is done. At the same time, there is less danger of the contents falling out laterally in the region of the longitudinal edges. The course of the opening line between the connection areas on the longitudinal edges of the side fold and the upper edge of the bag can be designed as desired. The opening line can be formed as a straight line, which converges with the Velcro closure sections arranged below the opening line from the upper edge of the bag or, for example, have an arcuate profile.

The plastic film from which the gusseted bag is made, in particular, consists of a multilayer composite film having a printable outer surface and a sealable inner surface. According to a preferred embodiment of the invention, the opening line consists of a line of weakness, which only cuts through a bag outer side cover layer of the multilayer plastic film. However, the opening line may also consist of a perforation, which passes through the front wall, the sides of the gusset and the rear wall as a continuous perforation. If the opening line is permeable to air, a peelable connection is preferably provided below the opening line, which extends from the side edges delimiting the longitudinal edges to the upper edge of the bag and connects adjacent inner surfaces of the side gusseted bag. The peelable connection allows an airtight completion of the Füllgutraums until the first opening of the bag packaging and consists for example of a peel seal or a cold-sealing lacquer.

To improve the dimensional stability of the pouch packaging, the longitudinal edges of the side-fold pouch are preferably reinforced by longitudinal sealing seams. The Velcro strip ends in front of the longitudinal sealing seams.

• auf eine ebene Folienbahn Elemente für Wiederverschlüsse aufgebracht werden,
• durch Falten der Folienbahn anschließend Seitenfalten gebildet werden und eine doppellagige Materialbahn mit eingelegten Seitenfalten erzeugt wird,
• die doppellagige Materialbahn durch Anbringen mindestens einer Längssiegelnaht zu einem flachliegenden Seitenfaltenschlauch geschlossen wird und
• durch Anbringen weiterer Siegelnähte eine Beutelkette gebildet wird, von der Seitenfaltenbeutel mittels eines Trennschnitts abgetrennt werden.

The invention also provides a method according to claim 18 for the production of the gusseted bags described. Provided is a method in which

• be applied to a flat sheet of web elements for reclosures,
• by folding the film web then gussets are formed and a two-ply material web is created with inserted gussets,
• the two-ply material web is closed by attaching at least one longitudinal sealing seam to a flat gusseted hose and
• by attaching further sealing seams, a bag chain is formed, are separated from the gusseted bag by means of a separating cut.

According to the invention, the reclosures are made of four hook and loop fastener sections, which are fastened mirror-symmetrically next to each other on the film web in a W-shaped arrangement.

In order to achieve the W-shaped arrangement, four separate Velcro strips are preferably used and aligned accordingly. But it is also possible to use a single, in its form exactly adapted Velcro strip, which already has a W-shape with mutually angled sections. In particular, if the hook-and-loop fastener sections have a self-adhering adhesive surface, can also first straight Velcro strip before attachment to the film web provided at its edges with incisions and then placed by angling at the incisions in a W-shape. It is preferably provided that the two outer hook-and-loop fastener sections of the W-shaped arrangement have a greater length than the two inner Velcro fastener sections.

The hook-and-loop fastener sections are each positioned on the film web at an angle of between 30 ° and 60 °, preferably at an angle of 45 °, relative to the web longitudinal direction, and thermally fixed to the film web by sealing or by an adhesive bond.

The mutually associated ends of the Velcro portions are expediently arranged at a distance from one another in the use of four separate Velcro strip, which is formed so that folds of the film portion associated with the rebates fold edges are formed, which pass undisturbed between the spaced apart ends of the Velcro strips. The distance between the facing ends of the outer Velcro strip and the inside adjacent Velcro strip corresponds to at least twice the width of a longitudinal edge reinforcing longitudinal seam.

Fig. 1

die Seitenansicht eines flachliegenden Seitenfaltenbeutels,

Fig. 2

eine Ansicht der Kopfseite des in Fig. 1 dargestellten Seitenfaltenbeutels,

Fig.3

einen Seitenfaltenbeutel gemäß Fig. 1, der nach einer Beutelbefüllung an seinem oberen Beutelrand mittels einer Kopfsiegelnaht zu einer allseitig geschlossenen Verpackung verschlossen worden ist, in einer perspektivischen Darstellung,

Fig. 4

die in Fig. 3 dargestellte Beutelverpackung in geöffnetem Zustand,

Fig. 5a und 5b

eine mit einem Wiederverschluss versehene obere Ecke des an seinem oberen Beutelrand durch eine Kopfsiegelnaht verschlossenen Seitenfaltenbeutels in geschlossenem und geöffnetem Zustand,

Fig. 6a und 6b

eine weitere Ausgestaltung des Seitenfaltenbeutels in einer der Fig. 5a und 5b entsprechenden Darstellung,

Fig. 7

ein Verfahren zur Herstellung der Seitenfaltenbeutel in einer stark vereinfachten Darstellung.

In the following, the invention will be explained with reference to exemplary embodiments. They show schematically:

Fig. 1

the side view of a flat side gusseted bag,

Fig. 2

a view of the head of the in Fig. 1 shown gusseted bag,

Figure 3

a gusseted bag according to Fig. 1 , which has been closed after a bag filling at its upper edge of the bag by means of a top seal seam to a package closed on all sides, in a perspective view,

Fig. 4

in the Fig. 3 illustrated bag package in the open state,

Fig. 5a and 5b

a reclosed upper corner of the closed at its upper edge of the bag by a top seal side gusseted bag in the closed and opened state,

Fig. 6a and 6b

a further embodiment of the gusseted bag in one of Fig. 5a and 5b appropriate representation,

Fig. 7

a method for producing the gusseted bags in a highly simplified representation.

The Fig. 1 and 2 show a made of a plastic film, lying flat side gusseted bag, which is closable after a bag filling at its upper edge of the bag by means of a top seal to a package closed on all sides. The gusseted bag has a front wall 1 and a rear wall 1 ', V-shaped inserted gussets 2, 2', which are connected to longitudinal edges 3 with the front wall and the rear wall, and a reclosure 4. At its lower end, the gusseted bag is closed by a transverse sealing seam 5. The reclosure 4 is on upper end of the gusseted bag bag inside arranged on a gusset 2 and adjacent bag inner surfaces of the front wall 1 and the rear wall 1 'and formed as a hook and loop fastener. To open the packaging, a bag section 6 above the reclosure 4 along an opening line 7 can be separated. The side fold 2 provided with the reclosure 4 ends above the opening line 7.

The reclosure 4 is composed of four separate Velcro strips 8, 9, the bag inside the front wall 1, the rear wall 1 'and both edges of the side fold 2 are arranged. The attached to the front wall 1 and the rear wall 1 'Velcro portions 8 are arranged in an upper bag corner and extend diagonally from the longitudinal edges 3 to a head seam provided for the surface 10 at the upper edge of the bag, wherein they reclosure in the area of the inserted gusset 2 form with the arranged on the adjacent edge of the gusset 2 Velcro 9 and where they extend beyond the gusset area out into the bag area between the inserted gussets and form a reclosure between the front wall 1 and the rear wall 1 '.

The on the front wall 1 and the rear wall 1 'arranged Velcro 8 and the longitudinal edges 3 of the side gusseted bag below the reclosure 4 include an angle α between 120 ° and 150 °. Preferably, this angle is 135 °, so that the hook and loop fastener sections 8 adjoin the front wall 1 and the rear wall 1 'at an angle β of 45 ° to the upper edge of the bag.

The front wall 1, the rear wall 1 'and the V-shaped inserted gussets 2, 2' are formed by folding a flat film web. The longitudinal edges 3 at the V-shaped inserted side folds 2, 2 'are formed as folding edges and reinforced by longitudinal sealing seams 23. The hook and loop fastener sections 8, 9 are not integrated into the longitudinal sealing seams 23 but end at a slight distance from them.

The opening line 7 is arranged in the bag corner above the reclosure 4 and extends on the front wall 1 and the rear wall 1 'parallel to the hook and loop fastener sections 8. For the first opening of the in Fig. 3 shown, sealed by a top seal 11 bag packaging 12, a portion 6 of the upper bag corner along the opening line 7 including a part of the gusset 2 is separated. Thereafter, the gusset 2 is accessible from the outside and can be pulled out of the bag. It forms an outwardly projecting chute 13, as in Fig. 4 is shown. The hook-and-loop fastener sections 8, 9 of the reclosure 4 have a uniformly designed adhesive surface which adheres to itself and which can be brought into mutual engagement from one another by latching elements. The adhesive surface of the Velcro portions 8, 9 is preferably 3 mm to 15 mm wide. By means of self-locking Velcro portions 8, 9, the chute 13 can be closed both in the folded and in the unfolded position.

While at the in the Fig. 5a and 5b illustrated embodiment, the opening line 7 extends to the front wall 1 and the rear wall 1 'parallel to the hook and loop fastener sections 8, the opening line 7 in Fig. 6a and 6b at the longitudinal edges 3 a greater distance from the hook-and-loop fastener sections 8 than at the top closed by the top seal seam bag edge. For the course of the opening line 7 between the two connection points on the longitudinal edges 3 and the upper edge of the bag various shapes are possible. The opening line 7 may be an arcuate Profile or converge with the below arranged hook-and-loop fastener sections 8 to the upper bag edge. In a comparative analysis of Fig. 5b and 6b It is clear that the angle of repose of the chute 13 can be changed by the course of the opening line 7. The in Fig. 6a illustrated course of the opening line 7 causes the unfolded chute 1 protrudes at a shallower angle. As a result, the pouring of the filling material takes place more strongly over the tip of the chute 13 and the risk is lower that the filling material first falls out laterally in the region of the longitudinal edges 3.

The opening line 7 consists in the illustrated embodiments of a perforation, the front wall 1, the edges of the gusset 2 and the rear wall 1 'passes through as a continuous perforation. Below the opening line 7, a peelable connection 14 is provided which extends from the longitudinal edges 3 to the surface 10 provided for the head seam 11 at the upper edge of the bag and connects adjacent inner surfaces of the gusseted bag. By the peelable compound 14 of the filling material space of the bag packaging is hermetically sealed before first opening. Alternatively, the opening line 7 can also consist of a weakening line, which merely cuts through a covering outer layer of the multilayer plastic film on the outside of the bag.

According to the in Fig. 7 schematically illustrated method are applied to a flat film web 15 elements for reclosures 4. By folding the film web 15 then gussets 2, 2 'are formed and a double-layered material web 16 is created with inserted gussets 2, 2'. The double-layer material web 16 is closed by attaching at least one longitudinal sealing seam 17 to a flat side gusseted tube 18. By attaching further sealing seams 19 finally becomes a Bag chain 20 formed to be separated from the gusseted bag by means of a separating cut. The Fig. 7 makes it clear that the reclosures 4 are each made of four Velcro portions 8, 9, which are mounted in a W-shaped arrangement mirror-symmetrically side by side on the film web 15, wherein the two outer Velcro portions 8 of the W-shaped arrangement have a greater length than The two Velcro closure portions 9 inside the Velcro portions 8, 9 are each at an angle β between 30 ° and 60 °, preferably at an angle β of 45 °, based on the web longitudinal direction, positioned on the film web 15 and thermally by sealing or by an adhesive bond is connected to the film web 15.

The representation in Fig. 7 one takes also that they are designed as separate Velcro strips, wherein the Velcro portions 8, 9 mutually associated ends of the Velcro strips at a distance a ₁ , a ₂ are arranged to each other. The distance a ₁ . a ₂ between the ends of the Velcro strips is selected so that fold lines 21, 22 are formed during folding of the reclosures 4 associated film portion, which pass undisturbed between the spaced apart ends of the Velcro strip. The distance a ₁ at the mutually facing ends of the outer Velcro strip and the inside adjacent Velcro strip corresponds to at least twice the width of the longitudinal edges 3 reinforcing longitudinal sealing seam 23rd

Claims (22)

1. A side-fold bag from plastic film, which following filling with content is closable at its upper bag rim by means of a top sealing seam to result in a package closed on all sides, with
   a front wall (1) and a rear wall (1'),
   V-shaped laid-in side-folds (2, 2'), which are connected with the front wall (1) and the rear wall (1') on longitudinal edges (3), and
   a reclosure (4), which is arranged inside the bag at one side-fold (2) and at adjacent bag inside surfaces of the front wall (1) and the rear wall (1') and formed as a hook - and - loop fastener,
   wherein, in order to open the package, a bag section (6) can be cut-off above the reclosure (4) along an opening line (7),
   wherein the side-fold (2) ends above the opening line (7),
   wherein the reclosure (4) is composed of four hook - and - loop fastener sections (8, 9), which are arranged inside the bag on the front wall (1), the rear wall (1') and both flanks of the side-fold (2), and
   wherein the hook - and - loop fastener sections (8) fastened to the front wall (1) and the rear wall (1') are arranged in an upper bag corner and, in the area of the laid-in side-fold (2), form a reclosure with the hook - and - loop fastener sections (9) arranged on the adjacent flank of the side-fold (2),
   characterised in that the hook - and - loop fastener sections (8, 9) extend diagonally from the longitudinal edges (3) limiting the side-fold (2) to an area (10) provided for the top sealing seam (11) on the upper bag rim.
2. The side-fold bag according to claim 1, characterised in that the hook - and - loop fastener sections (8, 9) are formed by a separate hook - and - loop fastener strip, respectively.
3. The side-fold bag according to claim 1 or 2, characterised in that the hook - and - loop fastener sections (8) fastened to the front wall (1) and the rear wall (1') extend beyond the side-fold area into the bag area between the laid-in side-folds (2, 2') and in here form a reclosure between the front wall (1) and the rear wall (1').
4. The side-fold bag according to one of claims 1 to 3, characterised in that the side-folds (2, 2') extend as far as the upper bag rim.
5. The side-fold bag according to one of claims 1 to 4, characterised in that the hook - and - loop fastener sections (8) arranged on the front wall (1) and the rear wall (1') and the longitudinal edges (3) of the side-fold bag enclose an angle (α) of between 120° and 150° below the reclosure (4).
6. The side-fold bag according to claim 5, characterised in that the angle α between the hook - and - loop fastener sections (8) and the longitudinal edges (3) of the side-fold (2) is 135° below the reclosure.
7. The side-fold bag according to one of claims 1 to 6, characterised in that two hook - and - loop fastener sections of the reclosure (4) have an adhering surface with hook elements, and two hook - and - loop fastener sections have an adhering surface with loops, and in that the differently formed hook - and - loop fastener sections are alternately arranged in such a way on the inside surfaces of the front wall (1), the rear wall (1') and the flanks of the side-fold (2) that an adhering surface with hook elements always faces an adhering surface with loops.
8. The side-fold bag according to one of claims 1 to 6, characterised in that the hook - and - loop fastener sections (8, 9) of the reclosure comprise a uniformly designed adhering surface of locking members adhering onto themselves, which can be brought into hook-up engagement with each other.
9. The side-fold bag according to one of claims 1 to 8, characterised in that the hook - and - loop fastener sections (8, 9) comprise a 3 mm to 15 mm wide adhering surface.
10. The side-fold bag according to one of claims 1 to 9, characterised in that the opening line (7) is arranged in the bag corner above the reclosure (4) and extends on the front wall (1) and the rear wall (1') in parallel with the hook - and - loop fastener sections (8).
11. The side-fold bag according to one of claims 1 to 9, characterised in that the distance of the opening line (7) arranged in the bag corner above the reclosure (4) from the hook - and - loop fastener sections (8) is larger at the longitudinal edges (3) of the bag than it is at the upper bag rim.
12. The side-fold bag according to claim 11, characterised in that the opening line (7) and the hook - and - loop fastener section (8) arranged below the opening line (7) converge towards the upper bag rim.
13. The side-fold bag according to claim 11, characterised in that the opening line (7) has a bow-shaped profile.
14. The side-fold bag according to one of claims 1 to 13, characterised in that the opening line (7) consists of a tear line which tears through merely a covering layer of the multi-layer plastic film on the outside of the bag.
15. The side-fold bag according to one of claims 1 to 13, characterised in that the opening line (7) consists of a perforation which as a constant perforation line passes through the front wall (1), the flanks of the side-fold (2) and the rear wall (1').
16. The side-fold bag according to one of claims 1 to 15, characterised in that a peelable connection (14) is provided below the opening line (7), which extends from the longitudinal edges (3) to the area (10) provided for the top sealing seam (11) at the upper bag rim and connects adjacent inner surfaces of the side-fold bag.
17. The side-fold bag according to one of claims 1 to 16, characterised in that the longitudinal edges (3) are reinforced by longitudinal sealing seams (23) and in that the closure sections (8, 9) end in front of the longitudinal sealing seams (23).
18. A method for manufacturing side-fold bags according to one of claims 1 to 17,
    wherein elements for reclosures (4) are fitted to a flat film web (15),
    wherein side-folds are then formed by folding the film web (15) and a double-layer material web with laid-in side-folds (2, 2') is produced,
    wherein the double-layer material web is closed to form a flat-lying side-fold tube (18) by fitting at least one longitudinal sealing seam (17), and
    wherein, by fitting further sealing seams (19), a bag chain (20) is formed, from which side-fold bags are cut-off by means of a separating cut,
    characterised in that the reclosures (4) are produced from four hook - and - loop fastener sections (8, 9), respectively, which are fastened mirror-symmetrically next to each other on the film web (15) in a W-shaped arrangement such that the hook - and - loop fastener sections (8, 9) of the bag extend diagonally from the longitudinal edges (3) limiting the side-fold (2) to a surface (10) on the upper bag rim provided for the top sealing seam (11).
19. The method according to claim 18, characterised in that the two outer hook - and - loop fastener sections (8) of the W-shaped arrangement are of a greater length than the two inner hook - and - loop fastener sections (9).
20. The method according to claim 18 or 19, characterised in that the hook - and - loop fastener sections (8, 9) are positioned on the film web at an angle of between 30° and 60°, respectively, preferably at an angle of 45° relative to the web longitudinal direction.
21. The method according to one of claims 18 to 20, characterised in that the ends of the hook - and - loop fastener sections (8, 9) associated with each other are arranged at a distance (a₁, a₂) to each other and in that, when the film section associated with the reclosures (4) is folded, folded edges (21, 22) are formed, which pass undisturbed between the spaced-apart ends of the hook - and - loop fastener sections (8, 9).
22. The method according to claim 21, characterised in that the distance (a₁) between the facing ends of the outer hook - and - loop fastener sections (8) and of the hook - and - loop fastener sections (9) arranged on the inside corresponds to at least the double width of the longitudinal sealing seam (23) reinforcing the longitudinal edge.

Images