EP1881929B1 - Film bag and method for producing it - Google Patents

Abstract

The invention relates to a film bag with two front faces (1, 1'), side folds (2) which are inserted between the front faces in a V-shaped manner, and a resealable closure (3) in a top opening in the bag, comprising two profiled strips (4, 4') and a slide (5). The film layers of the bag which rest one on the other are connected to transverse and longitudinal sealed seams at the bottom and along the edges of the side folds (2), with the longitudinal sealed seams (6) which run along the side folds extending from the bottom to the upper edge (7) of the bag. The resealable closure (3), including its slide (5), is arranged at a distance from the upper bag edge (7) inside the bag. At least one front face (1') of the bag contains a punched-out area (8) for the slide (5) which is matched to the dimensions of the slide (5) and in which the slide (5) is positioned before the bag is used for the first time. The invention also relates to a method for producing the described film bag.

Description

The invention relates to a film bag with a reclosure in a head-side opening of the bag according to the preamble of claim 1.

The initially flat foil bag is filled with filling material in bag filling devices. The filling takes place at the head of the bag. The contents are introduced into an opening which is still present between the reclosure and a front side of the film bag. Thereafter, this opening is closed by a sealed seam. Such foil bags are used inter alia for the packaging of animal feed.

A foil bag according to the preamble of claim 1 is made US Pat. No. 6,347,886 B1 known. The known foil bag has two front walls formed by folding a foil, which are connected at the bottom by a folding edge and at the longitudinal sides of the bag by sealing seams. The reclosure is arranged in a head-side opening of the bag and consists of two profile strips and a profile strips coupling slider, wherein one of the profile strip is connected to a front wall and the other profile strip after filling of the bag with the other front side is connectable. The reclosure, including its pusher, is spaced from the top edge of the bag within the bag, with a front of the bag containing a pusher die cut to match the dimensions of the pusher in which the pusher is positioned prior to first use of the bag. The front sides have at the upper end of the bag on a reclosing occlusive strip-shaped portion which can be torn off along a perforation line arranged below the slider. The formed without gusseted foil bag forms a pillow-shaped packaging.

A similar embodiment of a film package with a reclosure arranged on the top is in EP 1 234 773 A described.

Out DE 202 07 333 U1 a foil bag in the form of a gusseted bag is known, which has V-shaped inserted between the front side gussets and is also equipped with a reclosure. The reclosure is arranged at a head-side opening of the bag and consists of two profile strips and a profile strip coupling the slider. The slide of the reclosure overlaps closing edges of the profile strips like a rider and protrudes at the top of the bag. The profiled strips are connected together at their opposite end to the slider and form an original closure which can be torn when the foil bag is used for the first time. The disadvantage is that from the outside is not readily apparent whether the tamper-evident closure is still undamaged. Furthermore, there is a risk that the projecting slide will hang on resistors during transport of the bag or its handling in the trade and thereby shifts uncontrollably. The production of the foil bag is also expensive. Following the bag production, the reseals are applied in a downstream part of the plant. For this purpose, a film section of the already fabricated film bag is unfolded in the head region of the bag, placed a reclosure on the underlying film web and connected to this. Thereafter, the unfolded film section must be folded back and the missing sealing seams are attached. To apply the reclosures, existing equipment for the production of film bags must be extended by an additional system for applying the reclosures. The additional system for applying the reclosures is expensive and requires considerable space. As such, there is also a need to integrate reseal applications in the standard bag making process.

Against this background, the invention has for its object to provide a film bag in the form of a Sekenfaftenbetitels having a concealed slide closure and can be easily produced. Furthermore, a method is to be specified in which the application of the reclosures during the continuous web advance of a flat film web takes place before the bag is formed.

The invention and solution of this problem is a film bag according to claim 1. The reclosure including its slide is spaced from the upper edge of the bag within the bag. At least one front side of the bag includes a pusher die cut to match the dimension of the pusher in which the pusher is positioned prior to the first use of the bag. The reclosure is arranged concealed in the head region of the film bag, with the slider punch through the slide remains visible. For the consumer it is immediately apparent from the outside that the bag is equipped with a slide closure and the slide closure is properly closed. In addition, the Schieberausstanzung fulfills an important function in the production of foil bag. The Schieberausstanzung, which is adapted to the size of the slider and encloses this, allows application of the reclosure on a flat sheet of film before passing through these folding stations, in which the film web is folded and gussets are formed. The Schieberausstanzung sits exactly at the position of the slider and prevents during web travel on guide plates of the folding stations a displacement of the reclosure against the film direction.

The front sides of the film bag have at the upper end of the bag on a reclosing occlusive strip-shaped portion along an approximately at the level of the slider or below the slide arranged perforation line can be torn off. At the ends of the perforation line are punched lines extending through the longitudinal sealing seams to the outer edges of the bag. The strip can be completely and easily removed from the foil bag as a waste strip in the described embodiment, when a foil bag is first taken into use. In order to facilitate the separation of the strip, it is useful if the gussets end below the perforation line.

The tear-off strip along the perforation line can also fulfill the function of a tamper-evident closure if the double-layered strip is sealed with a transverse sealing seam at its upper edge after the foil bag has been filled. When putting the foil bag into use for the first time, the top strip must be cut off, exposing the reclosure at the upper edge of the foil bag. If the transverse sealing seam of the waste strip is undamaged, it is ensured that the foil bag has not previously been opened.

It is within the scope of the invention that the profile strip connected to the front before bag filling is connected only to the front side over its entire length and extends into the region of the side folds. In this embodiment, the bag can be fully opened for filling at its top. An alternative embodiment provides that the profile strip connected to the front before bag filling is laid over the side folds and connected to them. In this embodiment, the filling opening is slightly smaller.

The invention also provides a method according to claim 5 for the preparation of the film bag described.

The invention is based on the idea of applying the reseals to the flat film web before the film web passes through folding stations in which it is folded and gussets are formed. The application of the reseals according to the invention can be integrated into existing bag production systems. The inventive method makes use of the already existing in a bag making plant punching and Umfalteinrichtungen. In this case, however, the technical problem to be solved is that the reclosures during transport of the film web through the system, in particular in the Umfalteinrichtungen move, since the reclosures are initially connected only at the ends of the film web. There must be an opening between the profile strips of the reclosures and the film web so that the bags can be filled at the head end. Only after the bag filling this opening is closed by welding the profile strip with the front side of the film bag. The technical problem described is achieved by the method step b). According to the slide slide punches are introduced into the film web, which lie exactly at the position of the slide and during web travel through the bag making plant, especially during web travel on the guide plates of folding stations, prevent displacement of the reclosures and the slide against the film travel direction. The slides are as it were fixed in the assigned Schieberausstanzungen. The Schieberausstanzungen are in the simplest case to round holes whose diameter is adapted to the slider geometry.

Further, in zones of the flat film web from which the gussets are formed, window-shaped recesses are punched, which delimit the upper end of the bag side folds. Besides, in the plane Film web stamped transversely to the web longitudinal direction perforation lines, which are arranged at the level of the window-shaped recesses and each define a strip-shaped section in the bag string, which projects beyond the slide of the reclosure to the bottom seam of the adjacent bag. The strip can be used as a tamper evident closure. Before the first use of a bag, the strip is torn off, exposing the slider of the re-closure. The window-shaped recesses as well as the perforation lines are introduced into the flat film web before it passes through these folding stations, in which it is folded over and gussets are formed. In this case, there is the technical problem that the film web can tear in the folding stations on the perforation lines and window-shaped punched out when the molds engage in the perforation or punching and the film web gets caught on the tools. This problem can be solved in a surprisingly simple manner by the fact that the perforation lines extend substantially over the web width, but with the proviso that between the perforation and the window-shaped recesses in each case a 5 mm to 50 mm wide non-perforated film area remains. The film web is guided in the folding stations so that the edges of the folding tools abut the non-perforated film areas between the perforation and the recesses. The folding of the film web into a tubular web is carried out using triangular Umfaltblechen. If the window-shaped cutouts are centered over the triangular sheets, they surprisingly do not stick to the sheets.

In the longitudinal sealing seams are finally introduced punching cuts that connect to the perforation lines.

Fig. 1

einen flachgelegten Folienbeutel,

Fig. 2

den in Fig. 1 dargestellten Folienbeutel nach seiner Befüllung,

Fig. 3

ein Verfahren zur Herstellung der in Fig. 1 dargestellten flachgelegten Folienbeutel,

Fig. 4

eine ebene Folienbahn mit erfindungsgemäß eingebrachten Ausstanzungen, bevor die Folienbahn Faltstationen und Siegelstationen durchläuft.

In the following the invention will be explained with reference to a drawing showing only one embodiment. They show schematically:

Fig. 1

a flattened foil bag,

Fig. 2

the in Fig. 1 illustrated foil bag after its filling,

Fig. 3

a process for the preparation of in Fig. 1 illustrated flattened foil bag,

Fig. 4

a flat film web with inventively introduced punched holes before the film web passes through folding stations and sealing stations.

The in Fig. 1 shown film bag has two front sides 1, 1 ', V-shaped inserted between the front pages gussets 2 and a reclosure 3 in a head-side opening of the bag. The reclosure 3 consists of two profile strips 4, 4 'and a slide 5 coupling the profile strips. One of the profile strips 4 is connected to a front side 1. The other profile strip 4 'is connectable to a filling of the bag with the other front side 1'. The superposed foil layers of the bag are connected to the transverse and longitudinal sealing seams at the bottom and along the edges of the gussets 2, the longitudinal sealing seams 6 extending along the gussets 2 extending from the bottom to the upper edge of the bag. The reclosure 3 including its slide 5 is spaced from the upper edge of the bag 7 within the bag. A front side 1 'of the bag contains a pusher hole 8 adapted to the size of the pusher 5, in which the pusher 5 is positioned before the first use of the bag.

The front sides 1, 1 'have at the upper end of the bag on the reclosure 3 concealing strip-shaped portion 9, which is torn off along a arranged approximately at the level of the slider 5 or below the slide line 10. At the ends of the perforation line 10 close punching lines 11, which extend through the longitudinal sealing seams 6 to the outer edges of the bag. The gussets 2 terminate below the perforation line 10. The strip-shaped portion 9 can be separated along the perforation line 10 and the subsequent punching lines 11 of the foil bag. The re-closure 3 is exposed.

In the Fig. 1 foil bags shown are used for example for packaging animal feed. The filling takes place at the head of the bag. The contents are introduced into an opening which is still present between the reclosure 3 and a front side 1 'of the film bag. Thereafter, this opening is closed by a sealed seam. In addition, as a tamper-evident closure, the upper edge of the strip-shaped section 9, which is torn off during the first use of the foil bag, is sealed. The sealing takes place with a transverse sealing seam 12, which connects the film layers. In the Beutelbefüllanlage the bottom of the film bag is folded over to a floor stand. The Fig. 2 shows the filled stand-up pouch.

The process for the preparation of in Fig. 1 shown flattened foil bag is shown schematically in FIG Fig. 3 shown. In a flat film web 13 Schieberausstanzungen 8 are introduced. On the provided with Schieberausstanzungen 8 film web 13 reclosures 3 consisting of two superimposed and interconnected profile strips 4, 4 'and a slide 5, the closing edges of the profile strips 4, 4' like a rider engages across the web direction on the flat film web 13, that the slide 5 are in the Schieberausstanzungen 8. The profile strips 4, 4 'are connected only at the ends of the film web 13. Subsequently, the film web passes through 13 folding stations, in which the film web 13 is folded into a tube and gussets 2 are formed. In sealing stations 15, the superimposed film layers of the film web by sealing seams 6, "16, 16 'is connected, formed with transverse sealing seams 16, 16' transverse to the web direction of the bottom of the bag and the reclosures 3 are connected to a front side 1 of the bag and along The side gussets 2 longitudinal sealing seams 6 are attached in the web longitudinal direction, which extend from the bottom to the top edge 7 of the bag Bag separated.

In particular from Fig. 4 It is clear that in zones 18 of the flat film web 13, from which the gussets 2 are formed, window-shaped recesses 19 are punched, which limits the upper end of the bag side folds. In addition, perforations 10 are punched transversely to the web longitudinal direction in the flat film web 13, which are arranged in the amount of window-shaped recesses 19 and 17 each define a transverse strip or strip-shaped portion 9 in the bag string 17, via the slide 5 of the reclosure 3 to the bottom seam 16 of the survives adjacent bag. It takes the Fig. 4 in that the perforation line 10 extends over the web width with the proviso that between the ends of the perforation and the window-shaped recesses 19 in each case a 5 mm to 50 mm wide non-perforated film region 20 remains. The non-perforated film regions 20 between the perforation and the window-shaped recesses 19 prevent the film web 13 from tearing in the folding stations 14. In the longitudinal sealing seams 6 still punching cuts or punching lines 11 are introduced, which connect to the perforation lines 10.

In the in Fig. 1 illustrated embodiment, the profiled strip 4 connected to a bag filling with the front side 1 is placed over the gussets 2 and connected thereto. It is also within the scope of the invention that the profiled strip 4 connected to the front side 1 before a bag is filled is connected only to the front side 1 over its entire length and extends into the region of the lateral folds 2.

Claims (5)

1. Film bag consisting of a single film web with
   two front sides (1, 1') and
   a re-closure (3) in a top-side opening of the bag, consisting of two profile strips (4, 4') which are connected to each other and a slide (5) which couples the profile strips (4, 4'),
   wherein one of the profile strips (4) is connected to a front side (1) and the other profile strip (4') can be connected to the other front side (1') after the bag is filled, wherein the re-closure (3) including its slide (5) is arranged at a distance from the upper bag edge (7) inside the bag, wherein at least one front side (1') of the bag contains a slide stamped out section (8) which matches the dimensions of the slide (5), in which the slide (5) is positioned before the first use of the bag, and wherein the front sides (1, 1') at the upper end of the bag have a strip-shaped section (9) which covers the re-closure (3) and can be ripped off along a perforation line (10) which is arranged at the height of the slide (5) or below the slide, characterised in that side folds (2) are inserted in a V-shaped manner between the front sides (1, 1'), that the film layers of the bag which lie on top of one another are connected to transverse (16, 16') and longitudinal seal seams (6) at the bottom and along the edges of the side folds (2), wherein the longitudinal seal seams (6) which run along the side folds (2) extend from the bottom as far as the upper edge (7) of the bag, and that punched lines (11) connect to the ends of the perforation line (10), which punched lines extend through the longitudinal seal seams (6) to the outer edges of the bag.
2. Film bag according to Claim 1, characterised in that the side folds (2) end below the perforation line (10).
3. Film bag according to Claim 1 or 2, characterised in that the profile strip (4) which is connected to the front side (1) before the bag is filled is only connected to the front side (1) on its entire length and extends as far as the region of the side folds (2).
4. Film bag according to Claim 1 or 2, characterised in that the profile strip (4) which is connected to the front side (1) before the bag is filled is placed over the side folds (2) and connected to the latter.
5. Method for producing film bags according to one of Claims 1 to 4 with the following method steps:

   a) slide punched out sections (8) are introduced into a flat film web (13), and window-shaped cut-outs (19) are punched out in zones of the flat film web (13) from which side folds (2) are formed, which cut-outs delimit the upper end of the bag side folds (2);

   b) re-closures (3), consisting of two profile strips (4, 4') which lie on top of one another and are connected to each other and a slide (5) which straddles the closure edges of the profile strips (4, 4'), are placed onto the flat film web (13) transversely to the web direction in such a manner that the slides (5) lie in the slide punched out sections (8) and are connected at the ends to the film web (13);

   c) perforation lines (10) are stamped into the flat film web (13) transversely to the web longitudinal direction, which lines are arranged at the height of the window-shaped cut-outs (19) and in each case delimit a strip-shaped section (9) in the bag strand (17), which section projects beyond the slide (5) of the re-closure (3) as far as a bottom seal seam (16'), which is still to be fastened, of an adjacent bag, wherein the perforation lines extend over the web width with the proviso that in each case a 5 mm to 50 mm wide non-perforated film region (20) remains between the perforation and the window-shaped cut-outs (19);

   d) the film web (13) is then guided through folding stations (14) in which the film web (13) is folded, and side folds (2) are formed;

   e) the film layers of the film web which lie on top of one another are connected by seal seams (6, 16, 16'), wherein the bottom of the bag is formed with transverse seal seams (16, 16') transversely to the web direction and the re-closures (3) are connected to a front side (1) of the bag, and wherein longitudinal seal seams (6) are applied in the web longitudinal direction along the side folds (2), which seams extend from the bottom as far as the upper edge (7) of the bag;

   f) punched sections (11) are introduced into the longitudinal seal seams (6), which sections connect to the perforation line (10);

   g) bags are detached from the bag strand (17) formed in method step e).

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