WO2006122761A1

WO2006122761A1 - Film bag and method for producing it

Info

Publication number: WO2006122761A1
Application number: PCT/EP2006/004634
Authority: WO
Inventors: Jochen Brauer; Marcus Kujat; Detlef Stöppelmann; Darius Maseiker
Original assignee: Nordenia Deutschland Halle Gmbh Werk Steinfeld
Priority date: 2005-05-18
Filing date: 2006-05-17
Publication date: 2006-11-23
Also published as: BRPI0610820A2; ES2340710T3; ZA200710315B; DE102005022743B4; JP2008540278A; JP5161765B2; AU2006249119A1; MX2007014245A; EP1881929A1; NZ563372A; AU2006249119B2; CA2608005A1; US20090136160A1; CA2608005C; EP1881929B1; ATE465952T1; DE502006006853D1; DE102005022743A1

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 (V) of the bag contains a punched-out area (8) for the slide 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

Foil pouch and method for its production

Description:

The invention relates to a foil bag with

two fronts,

V-shaped between the front pages inserted gussets and

a reclosure in a head-side opening of the bag consisting of two profile strips and a profile strips coupling the slide,

wherein one of the profile strips is connected to a front side and the other profile strip is connectable after filling the bag with the other front side, wherein the superimposed layers of film of the bag with transverse and longitudinal sealing seams on the bottom side and along the edges of the gussets are connected and wherein along the Gussets extending longitudinal sealing seams extending from the bottom to the top of the bag. 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. Foil bags with the described features are used, inter alia, for packaging animal feed.

A foil bag with the described features is known from DE 202 07 333 U1. The slider of the reclosure overlaps closure edges the profile strip rider-like and protrudes at the top of the bag. The profile strips are connected to each other at their opposite end of the slider and form a tamper-evident, which is torn when first using the foil bag. 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 Beutelher- position the reclosures 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. Afterwards the unfolded film section must be folded back and the missing sealing seams must be applied. To apply the reseals, existing systems for the production of film bags must be extended by an additional system for applying the reseals. 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 foil bag, which has 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.

Starting from a foil pouch with the features described in the introduction, the object is achieved according to the invention in that the reclosure, including its slide, is arranged at a distance from the upper edge of the pouch within the pouch and at least one front side of the pouch The bag contains a pusher fitting adapted to the size of the pusher in which the pusher is positioned prior to the first use of the bag. According to the reclosure in the head region of the film bag is arranged concealed, the slider remains visible through the Schieberausstanzung. 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 slide punching fulfills an important function in the production of film pouches. 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 slide punching is located exactly at the position of the slide and prevents during web travel on guide plates of the folding stations a displacement of the reclosure against the direction of film travel.

The front sides of the film bag have at the upper end of the bag on a reclosing occlusive strip-shaped portion which can be torn off according to a preferred embodiment of the invention along a arranged approximately at the level of the slider or below the slider line of perforation. At the ends of the perforation line suitably include punching lines which extend 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 film bag has been filled. When first putting the foil bag into use the top strip must be severed exposing the reclosure at the top 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 over its entire length only to the front side 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 process for producing the film bag described. The method according to the invention comprises the following method steps:

a) Schieberausstanzungen be introduced into a flat film web;

b) reclosing consisting of two superimposed and interconnected profile strips and a slider which engages over tabs of the profile strip like a rider are placed transversely to the web direction on the flat film web that the slides are in the Schieberausstanzungen, and are connected at the ends of the film web ;

c) then the film web is passed through folding stations, in which the film web is folded and gussets are formed; d) the superimposed film layers of the film web are joined by sealing seams, formed with transverse sealing seams transverse to the web direction of the bottom of the bag and the reclosures are connected to a front side of the bag and along the side pleats longitudinal sealing seams are attached in the web longitudinal direction extending from the ground to the extend the upper edge of the bag;

e) bags are separated from the bag strand formed in process step d).

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 reclosures 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 Beutelherstellungs- anläge, 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 sliders are in the assigned Neten Schieberausstanzungen as it were fixed. In the simplest case, the slide expansions are round holes whose diameters are adapted to the slide geometry.

According to a preferred embodiment of the invention, in zones of the flat film web, from which the side folds are formed, window-shaped recesses are punched, which delimit the upper end of the bag side folds. Appropriately be perforated in the flat film web transverse 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 strand, 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 way by the fact that the perforation lines extend essentially 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 finally punched cuts can be introduced, which connect to the perforation lines.

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

1 a flattened foil bag,

2 shows the film bag shown in Fig. 1 after its filling,

3 shows a method for producing the flattened foil pouches shown in FIG. 1, FIG.

Fig. 4 is a flat sheet with inventively introduced punched holes before the film web passes through folding stations and sealing stations.

The film bag shown in Fig. 1 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 slider 5 coupling the profile strips. One of the profiled 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 has a dimension which corresponds to the dimension of the slider 5. fitted pusher punching 8 in which the pusher 5 is positioned prior to the first use of the pouch.

The front sides 1, 1 'have at the upper end of the bag a strip-like section 9 covering the reclosure 3, which can be torn off along a perforation line 10 arranged approximately at the level of the slider 5 or below the slider. 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.

The film bags shown in Fig. 1 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, the top edge of the strip-shaped section 9, which is torn off when the foil bag is used for the first time, is sealed as a tamper-evident closure. 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. Fig. 2 shows the filled stand-up pouch.

The process for producing the flattened foil pouches shown in FIG. 1 is shown schematically in FIG. 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 slider 5, the locking edges of the profile strips 4, 4 ¹ like a rider engages across the web direction on the flat film web 13, the slides 5 lie in the slide punch-outs 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 'are 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 wherein along the Gussets 2 longitudinal sealing seams 6 are mounted in the web longitudinal direction, which extend from the bottom to the upper edge 7 of the bag. In this way, a bag string 17 of bags, which are connected at the bottom or head end. From the bag string 17, the bags are finally separated.

In particular, from Fig. 4 it is clear that in zones 18 of the flat sheet of film 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, perforation lines 10 are punched transversely to the web longitudinal direction in the flat film web 13, which are arranged at the level of the window-shaped recesses 19 and each define a transverse strip or strip-shaped section 9 in the bag string 17, via the slide 5 of the reclosure 3 bis to the bottom seam 16 of the adjacent bag protrudes. 4 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 each have a 5 mm to 50 mm wide non-perforated film portion 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 exemplary embodiment illustrated in FIG. 1, the profile strip 4 connected to the front side 1 prior to a bag filling is placed over the gussets 2 and connected with them. 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

claims:

1. foil bag with

two fronts (1, 1 ¹ ),

V-shaped between the front sides (1, 1 ¹ ) inserted gussets (2) and

a re-closure (3) in a head-side opening of the bag consisting of two profile strips (4, 4 ') and a profile strip (4, 4') coupling slide (5),

wherein one of the profile strips (4) is connected to a front side (1) and the other profile strip (4 ¹ ) after filling of the bag with the other front side (V) is connectable, wherein the superposed foil layers of the bag with transverse and longitudinal sealing seams on the bottom side and along the edges of the gussets (2), and wherein the longitudinal sealing seams (6) extending along the gussets (2) extend from the bottom to the top edge (7) of the bag, characterized in that the reclosure (3) including its slider (5) is arranged at a distance from the upper edge of the bag (7) inside the bag, and that at least one front side (V) of the bag contains a slide punch-out (8) adapted to the dimensions of the slide (5), in which the slide (5 ) is positioned prior to the first use of the bag.

2. Film bag according to claim 1, characterized in that the front sides (1, V) at the upper end of the bag have a re-closure (3) covering strip-shaped portion (9) along a height of the slider (5) or below the Slider arranged perforation (10) can be torn off.

3. foil bag according to claim 2, characterized in that at the ends of the perforation lines (10) connecting punching lines (11) extending through the longitudinal sealing seams (6) to the outer edges of the bag.

4. foil bag according to claim 2 or 3, characterized in that the gussets (2) terminate below the perforation line (10).

5. Foil bag according to one of claims 1 to 4, characterized in that before a bag filling with the front side (1) connected profile strip (4) is connected over its entire length only with the front side (1) and extends into the Area of gussets (2) extends.

6. Foil bag according to one of claims 1 to 4, characterized in that before a bag filling with the front side (1) connected profile strip (4) over the side gussets (2) is placed and connected thereto.

7. A process for the production of film bags according to one of claims 1 to 6, comprising the following process steps:

a) Schieberausstanzungen (8) are introduced into a flat film web (13);

b) reclosures (3) consisting of two superimposed and interconnected profile strips (4, 4 ¹ ) and a slider (5), the locking edges of the profile strips (4, 4 ') like a rider overlaps, are transverse to the web direction so on the flat film web ( 13) placed on the slide (5) lie in the Schieberausstanzungen (8), and are connected at the ends of the film web (13); c) subsequently, the film web (13) is guided by folding stations (14), in which the film web (13) is folded and gussets (2) are formed;

d) the superimposed film layers of the film web are connected by sealing seams (6, 16, 16 '), formed with transverse sealing seams (16, 16') transversely to the web direction of the bottom of the bag and the reclosures (3) with a front side (1) of the Bags are attached and along the side gussets (2) longitudinal sealing seams (6) are attached in the web longitudinal direction, which extend from the bottom to the upper edge (7) of the bag;

e) the bag is separated from the bag strand (17) formed in process step d).

8. The method according to claim 7, wherein in zones (18) of the flat film web (13) from which the gussets (2) are formed, window-shaped recesses (19) are punched, which limit the upper end of the bag side folds (2).

9. The method according to claim 8, wherein perforated in the flat film web (13) transversely to the web longitudinal direction perforation lines (10) which are arranged in the amount of window-shaped recesses (19) and in the bag string (17) each defining a strip-shaped portion (9) extending beyond the slider (5) of the reclosure (3) to the bottom seam (16 ') of the adjacent bag, the perforation lines extending across the width of the web, with the proviso that between the perforation and the window-shaped recesses (19) 5 mm to 50 mm wide non-perforated film area (20) remains.

10. The method of claim 9, wherein in the longitudinal sealing seams (6) punched cuts (11) are introduced, which connect to the perforation line (10).