EP2857323A1 - Film packaging bag and method for producing the film packaging bag - Google Patents

Abstract

The invention relates to a film packaging bag with two front walls (1), between the front walls (1) inserted at Beutellängsänder, formed of separate film strips gussets (2), which are connected by longitudinal sealing seams (3) with the front walls (1), and with a reclosure , wherein the reclosure has a closure slide (4) and two closure strips (5) each having a connection lug (6) and a profile section (7), wherein the connection lugs (6), with which the closure strips (5) on each one of the front walls ( 1), extend in a bag transverse direction over the entire width of the front walls (1) and wherein the closure slide (4) for opening and closing the reclosure on the profile sections (7) is arranged. According to the invention, the reclosure is arranged below an upper edge of the bag, wherein an upper end section (9) of the front walls (1) can be separated along a weakening line (10) which is located at the longitudinal bag edges above and between the longitudinal bag edges on the front walls (1) below the profile sections (FIG. 7) runs. - To publish with Fig. 1.

Description

The present invention relates to a film packaging bag with two front walls, between the front walls at Beutellängsänder inserted, formed from separate film strips gussets, which are connected by longitudinal sealing seams with the front walls and with a reclosure, the reclosure a closure slide and two closure strips, each with a terminal lug and a Profile section, wherein the terminal lugs, with which the closure strips are attached to each one of the front walls extending in a bag transverse direction over the entire width of the front walls and wherein the shutter slide is arranged to open and close the reclosure on the profile sections.

The invention also provides a process for producing the film packaging bag, in which a web of successive film packaging bags are transported in a product direction which corresponds to the transverse direction of the bag relative to the individual film packaging bag.

For the production of foil pouches with gussets, various production methods are known. Thus, the entire foil packaging bag can be formed by folding from a single foil web. However, the present invention relates to an embodiment in which the front walls and the side folds are formed from separate film sections.

The EP 1 541 332 A1 describes a method for the production of foil packaging bags, in which a bag string is formed in such a way that one another following film packaging bags are arranged side by side with their bag longitudinal edges. The production direction thus corresponds to a bag transverse direction of the individual bags. According to the EP 1 541 332 A1 First, a bag string is formed with successive, initially connected bag blanks. A first film web is guided in the production direction. Thereafter, a film strip is fed, wherein the edges of the film strip are folded over to a central portion. The edges are usually the same width, leaving a gap between the two edges after folding.

Subsequently, pieces of film strip at a uniform distance transversely to the production direction (ie along the bag longitudinal direction) are placed on the first film web before a second film web is fed in the production direction, with the first film web and the pieces of film strip are covered. Then longitudinal sealing seams are produced transversely to the direction of production, with which the film strips are welded on the one hand to the folded edges with the second film web and on the other hand on its opposite side with the first film web. From the thus formed bag strand, individual film packaging bags are finally separated by a cut in the region of the film strips in such a way that two side folds of successive film packaging bags are formed from a folded film strip.

The method described is also referred to in practice as a transverse method.

A likewise produced in the transverse method film packaging bag with the features described above is known from WO 2005/113357 A1 known. The film packaging bag has a reclosure at its upper edge with two closure strips on. The closure strips each have a connection lug, which is attached to an inside of the bag on the front walls. Furthermore, the closure strips each have a profile section at their uppermost end, wherein the profile sections of the two closure strips can be locked together. In order to be able to effect the locking by simple means, a closure slide is provided, so that the function of a zipper results. Corresponding closures are also referred to as slider closures.

The reclosure is formed in the cross-process of a continuous strand, so that the reclosure extends over the entire width of the two front walls. In order to be able to incorporate the reclosure in the transverse method, this is arranged at the upper end of the film packaging bag, extending beyond the upper edge of the front walls.

From the DE 10 2005 022 743 B3 For example, a gusseted pouch with gussets in which a slider closure is placed inside the pouch prior to initial opening is known. The film packaging bag is formed by folding and heat sealing of a single material web, wherein the web is placed in its length exactly prefastened reclosure, which can not extend over the entire width of the front walls, because otherwise a formation of the film packaging bag by folding and heat sealing not is possible. In particular, the folding edges and the longitudinal sealing seams to be produced there must remain free.

Starting from a film packaging bag with the features described above, the invention has the object, an improved To protect the reclosure from opening for the first time, in particular, in a transport or other handling of the sealed foil pouch improved protection is to be achieved.

The invention and the solution of the problem are a film packaging bag according to claim 1 and a method for producing film packaging bags according to claim 8. Starting from a film packaging bag with the features described above, the invention provides that the reclosure is disposed below an upper edge of the bag and that an upper End portion of the front walls to expose the reclosure along a line of weakness is severable, which runs at the bag longitudinal edges above and between the bag longitudinal edges on the front walls below the profile sections.

In the case of the film packaging bag according to the invention, it is initially provided that at least the terminal lugs of the closure strips extend over the entire width of the front walls, which results from the production process when the film packaging bag is produced in a transverse process. Since the terminal lugs extend over the entire width of the front walls and thus into the longitudinal sealing seams, the tearing of the upper bag section is not possible in the region of the terminal lugs. According to the invention it is therefore provided that the line of weakness at the bag longitudinal edges above the profile sections and thus extends above the entire closure strip, in which case the line of weakness is drawn from the bag longitudinal edges down to expose the shutter, so that easily grasped and operated with one hand can be. Only by such, not straight course of Line of weakness on the front walls are at the same time a concealed arrangement, easy opening and good handling possible with a reclosure extending over the entire width.

By the described course of the weakening line is also achieved that the shutter slide is limited in the direction of the bag longitudinal edges in its opening and closing movement on the advantage.

Both the terminal lugs and the profile sections of the closure strips can extend over the entire width of the front walls up to the bag longitudinal edges. However, it may be disadvantageous that significant accumulations of material can result at the interlockable profile sections, which can cause problems in a heat-sealing or at least impair the visual appearance.

Depending on the design of the film packaging bag but also in over the entire width continuous profile sections reliable production is possible, which can be worn by the inventive offset the line of weakness at the bag longitudinal edges and a certain flattening of the profile sections at the bag longitudinal edges in a heat sealing.

According to an alternative embodiment of the invention it is provided that the profile sections have a small length along the transverse direction of the bag as the terminal lugs and preferably before, in particular short of the longitudinal sealing seams end. In the manufacturing method described in detail below, for example, the corresponding areas can be punched out or otherwise cut out in a simple manner.

In order to achieve a denser closure or to prevent removal of the closure slide, the profile sections can be connected to each other at the lateral ends of the reclosure or even just hineinerstrecken in the longitudinal sealing seams. Depending on the configuration of the foil packaging bag, these measures are not necessary due to the shape of the weakening line. Since the line of weakness is led up to the bag longitudinal edges, there is also blocked the shutter slide against excessive movement.

According to a preferred embodiment of the invention, the film packaging bag at a lower edge of the bag on a separate film bottom between the front walls, which is connected by transverse sealing seams with the front walls. Such a film bottom, which allows a secure state of the film packaging bag, can be produced in a particularly simple manner in the transverse method described above.

Furthermore, it is preferred within the scope of the invention if the side folds end below the reclosure, so that the two front walls at the upper end of the film packaging bag are also directly connected to one another at the longitudinal edges of the bag. The handling of the film packaging bag, in particular a tearing, can be facilitated. A particularly simple fixation of the reclosure on the front walls is possible if there is a gap between the upper edge of the gussets and the terminal lugs of the closure strip. Alternatively, in principle, however, it can also be provided that the side folds extend at least as far as the connection lugs and are then closed by the connection lugs. Even then, however, the two front walls above the reclosure are directly connected.

The line of weakness provided with bends and / or curves can be generated, for example, by a laser, material weakening and / or perforation being able to be produced both by material removal and / or embrittlement. In particular, where the line of weakness runs on the front walls below the profile sections, the generation by means of laser can be expedient. Alternatively or additionally, however, a perforation can also be produced by punching, especially in the area of the bag longitudinal edges, in order to allow easy crack initiation. Accordingly, incisions, tear notches or the like may be present at the bag longitudinal edges.

Sections produced on the one hand by a laser and on the other hand by a mechanically formed perforation can also be combined to simplify the manufacturing process. For example, if the central part of the weakening line extending below the profile sections is straight and is formed by a laser, no complex curve guidance of the laser is necessary, while the curved edge regions can easily be perforated by a punch.

Finally, different sections may also be provided to improve the tearing behavior. In a perforation with separate sections and webs in between, a sawtooth-shaped force curve results when tearing, in order to be able to cut through bridge by bridge. Depending on the design of the perforations, a somewhat greater resistance can deliberately be generated in order to avoid accidental tearing of the head region along the line of weakness.

The above-described formation of a tear notch is particularly expedient because a user is also immediately the weakening is displayed, so that there is a particularly intuitive handling.

In order for a user to be able to perceive the closure slide even before a first opening, the latter can be seen in an opening which is present in at least one of the two front walls before being opened for the first time and before the upper end section of the front walls is torn off. A user then recognizes immediately that the foil packaging bag is equipped with a particularly comfortable reclosure. In addition, a user also immediately opens up the particularly advantageous function of resealing.

So that the reclosure is particularly reliably protected, the front walls may be connected to the upper end portion of a transverse sealing seam, so that the closure slide is not accessible at all until a tearing of the upper end portion of the front walls and can not be operated.

The front walls and the two side folds are formed from a film or films which are heat-sealable on the inside of the bag. Usually, multilayer coextruded or preferably multilayer laminated films are used, which melt at a predetermined heat sealing temperature only on a film layer which is arranged on an inner side of the bag. On the other hand, the opposite outer layer of the film is not or only heat-sealable at a higher temperature, so that this outer layer is not impaired during the production of the film packaging bag.

Suitable examples are multilayer laminated films which have a heat-sealable layer of a low melting polyolefin, in particular polyethylene. For example, polyethylene terephthalate (PET) or biaxially oriented polypropylene (BO-PP) may be provided as the opposite outer layer forming the outer surface of the film wrapping bag. If a laminated film is used, this can be printed in a particularly advantageous manner before the lamination inside.

The invention also provides a method for producing the above-described film packaging bag or a multiplicity of such film packaging bags, wherein a first film web is fed in a production direction to form the first front wall, wherein film strips folded onto themselves are formed along the production direction at a uniform spacing the gussets are applied to the first film web transversely to the production direction, wherein a continuous strand with the two closure strips is requested on the first film web, that remains between the strand and an edge of the first film web, wherein at a uniform distance along the production direction Lock slide are placed on the strand, wherein the formation of the second front wall, a second film web is supplied and disposed over the first film web, wherein the film webs and the film strips by sealing seam e are connected to each other with the inclusion of the strand, wherein the front walls are cut with the film strips arranged therebetween so transversely to the production direction, that from one sheet strip, the gussets are formed by two consecutively in the direction of production film packaging bags, wherein individual bag blanks are formed, in which reclosures formed by sections of the strand, each in one Spaced to an upper edge of the bag are arranged, and wherein the front walls formed by the film webs are joined together at the upper edge of the bag, so that the reclosure is then concealed within the film packaging bag.

The method steps described can be carried out in the stated order. According to an alternative embodiment of the method, it is provided that the second film web is arranged above the first film web before the strand with the two closure strips is arranged between the two film webs.

This results in the advantage that the strand with the two closure strips can be connected on both sides with two film webs in a single sealing process. The strand is then inserted between the two already supplied film webs. For this example, the second film web in the head area initially remain unsealed and are folded up to then hang the strand on the first sheet can.

In order to avoid that during the attachment of the strand to the film webs, the sealing strips are sealed to each other, a separating plate between the two closure strips can be inserted. In particular, it can be provided that initially a bag blank is formed, which is stored and transported before filling.

The method step in which the front walls are connected to one another at the upper edge of the bag can, in the context of the described embodiments, subsequently be carried out after filling the bag blank, in order then to form a sealed film packaging bag. In particular, it may also be provided that to enable easy filling of the reclosure is initially attached only to one of the two front walls and then sealed with the other front wall, even if the two front walls are connected to each other at the top edge of the bag.

As described above, the closure slide can also be arranged in an opening which is produced in at least one of the film webs at a uniform distance in the production direction. Such openings can be punched out, for example.

Furthermore, it can be provided that a partial area of the profile sections is removed at a uniform distance in the direction of production on the closure strip. Conveniently, the portions of the profile sections are removed, where subsequently the longitudinal sealing seams are generated. Even with a continuous supply of the closure strip as a strand, the punching or removal of the portions can be done in a particularly simple manner by a cutting blade or the like.

The weakening line can be formed for example with a laser and / or by punching.

In order to enable precise process control and positioning of the individual elements, openings, etc., a marking may be provided on the film webs, in particular the first film web, which is detected as a repeat mark by a process control.

Fig. 1

einen erfindungsgemäßen Folienverpackungsbeutel in einer schematischen Ansicht;

Fig. 2

eine alternative Ausgestaltung des erfindungsgemäßen Folienverpackungsbeutels.

The invention will be explained in the following with reference to a drawing showing only one exemplary embodiment. Show it:

Fig. 1

a film packaging bag according to the invention in a schematic view;

Fig. 2

an alternative embodiment of the film packaging bag according to the invention.

The Fig. 1 shows a film packaging bag according to the invention in a schematic view. The film packaging bag comprises two front walls 1 and two side folds 2 inserted between the front walls 1 at the longitudinal edges of the bag, which are formed by separate film strips and are connected to the front walls 1 by longitudinal sealing seams 3.

The film packaging bag furthermore has a reclosure with a closure slide 4 and two closure strips 5. The closure strips 5 are each secured with a terminal lug 6 on the inside of an associated front wall 1, wherein at a top end of the closure strip 5, a profile section 7 connects to the terminal lug 6. The two profile sections 7 of the closure strips 5 can be latched to each other, wherein the profile sections 7 are compressed or pulled apart by the closure slide 4 in the manner of a zipper. Such reclosure is also known as slider closure.

Furthermore, it can be seen that the reclosure is disposed protected against a first opening of the film packaging bag between the two front walls 1. Only the closure slide 4 is visible through an opening 8 in one of the two front walls 1, wherein an actuation of the closure slide 4 but not yet possible. So that the closure slide 4 can be actuated, an upper end section must first be used 9 are separated along a weakening line 10 formed in the front walls 1.

In addition to the gussets 3, the film packaging bag also has a separate film base 11, so that the film packaging bag can be set up particularly reliably.

The film packaging bag is produced in a transverse process, in which the film bottom 11 can be inserted in a particularly simple manner between the two front walls 1. The arrangement of the closure strip 5 is particularly simple in such a transverse method, because a continuous strand of the closure strip 5 can be provided for a plurality of successive foil packaging bag. Accordingly, it can also be seen in the single figure that at least the terminal lugs 6 of the closure strips 5 extend over the entire width of the front walls 1 in a transverse direction of the bag.

There, where the terminal lugs 6 are integrated into the longitudinal sealing seams 3, the end portion 9 can not be demolished or only with considerable effort. For this reason, the weakening line 10 has a non-straight course, wherein the weakening line 10 at the bag longitudinal edges, ie in the region of the longitudinal sealing seams 3, is pulled upwards. Accordingly, the weakening line 10 extends at the bag longitudinal edges above and between the bag longitudinal edges on the front walls 1 below the profile sections 7.

However, in order to avoid excess material accumulation on the longitudinal sealing seams 3, the profile sections 7 of the closure strips 5 are shorter along the transverse direction of the bag than the connection lugs 6. This can be, for example be achieved in that in the manufacturing process, the profile sections 7 are punched away at the appropriate locations.

In addition to the longitudinal sealing seams 3, transverse sealing seams 12, 12 'are provided, with which the two front walls 1 are connected directly to one another on the underside of the bag bottom sheet 11 with the front walls 1 and on the other hand.

The gussets 2 terminate below the reclosure strip 5 so that the gussets 2 can not interfere with the assembly of the reclosure strips 5 during manufacture. The gussets 2 are expediently folded outwards in such a way that a tight closure on the longitudinal sealing seams 3 is achieved solely by the folding. Alternatively, the gussets 2 may also be otherwise closed at their upper edge, for which purpose, for example, a separate, not shown, foil tape can be used. Furthermore, it is also possible to guide the gussets 2 to below the terminal lugs 6, so that the gussets 2 are closed by the terminal lugs 6.

The weakening line 10 can be formed in different ways. Particularly preferably, the line of weakness 10 is generated by a laser, wherein in particular in the region of the longitudinal sealing seams 3, punching is additionally considered, in order to enable a particularly simple crack initiation.

The Fig. 2 shows an alternative embodiment in which, in contrast to the Fig. 1 also extend the profile sections 7 of the closure strip along the entire transverse direction of the bag and correspondingly have the same length for the terminal lugs 6. By integrating the profile sections 7 in the longitudinal sealing seams 3 results in a certain accumulation of material, which is indicated by a broadening of the integrated in the longitudinal sealing seams 3 profile sections 7.

In order to take account of this accumulation of material, the offset provided at the line of weakness 10 between a middle region of the weakening line 10 and the ends of the weakening line 10 on the longitudinal sealing seams 3 is chosen to be slightly larger than that in FIG Fig. 1 ,

Since the profile sections 7 are integrated in the longitudinal sealing seams 3, in comparison to the embodiment according to the Fig. 1 facilitates the production, because no punching of the profile sections 7 is necessary and because in addition no repeat must be observed. By integrating the profile sections 7 and the longitudinal sealing seams 3, end stops or the like can be dispensed with, because the movement of the closure slide 4 is limited by the two longitudinal sealing seams 3.

Claims (15)

Film packaging bags having two front walls (1), between the front walls (1) inserted at bag longitudinal edges, formed from separate film strips gussets (2), which are connected by longitudinal sealing seams (3) with the front walls (1), and with a reclosure, wherein the reclosure a closure slide (4) and two closure strips (5) each having a terminal lug (6) and a profile section (7), wherein the terminal lugs (6) with which the closure strips (5) in each case one of the front walls (1) are attached extending in a bag transverse direction over the entire width of the front walls (1) and wherein the closure slide (4) for opening and closing the reclosure on the profile sections (7) is arranged, characterized in that the reclosure is disposed below an upper edge of the bag and in that an upper end section (9) of the front walls (1) can be separated along a weakening line (10) i st, which runs at the bag longitudinal edges above and between the bag longitudinal edges on the front walls (1) below the profile sections (7). Foil packaging bag according to claim 1, characterized in that at a lower edge of the bag, a separate foil bottom (11) between the front walls (1) and by transverse sealing seams (12 ') with the front walls (1) is connected. Film packaging bag according to claim 1 or 2, characterized in that the side folds (2) terminate below the reclosure. Film packaging bag according to one of claims 1 to 3, characterized in that a material weakening and / or perforation produced by a laser is provided as a weakening line (10). Film packaging bag according to one of claims 1 to 4, characterized in that the closure slide (4) in an opening (8) of one of the front walls (1) is arranged. Film packaging bag according to one of claims 1 to 5, characterized in that on the closure strip (5) the profile sections (7) along the transverse direction of the bag have a smaller length than the connecting lugs (6). Film packaging bag according to one of claims 1 to 6, characterized in that the front walls (1) are connected to the upper bag portion with a transverse sealing seam (12). Process for the production of film packaging bags according to one of Claims 1 to 7,
wherein a first film web is fed in a production direction, wherein along the production direction at a uniform distance on self-folded film strips to form the gussets (2) are placed transversely to the direction of production on the first film web.
wherein a continuous strand with the two closure strips (5) is arranged on the first film web in such a way that a distance remains between the strand and an edge of the first film web,
wherein along the production direction at a uniform distance shutter slide (4) are placed on the strand,
wherein a second film web is fed and placed over the first film web,
wherein the film webs and the film strips are joined together by sealing seams with the involvement of the strand,
wherein the front walls (1) with the film strips arranged therebetween are cut transversely to the production direction such that from each one film strip the side folds (2) are formed by two film packaging bags following one another in the production direction,
wherein individual bag blanks are provided, wherein the reclosures formed by portions of the strand are each arranged at a distance from an upper edge of the bag, and
wherein the front walls (1) formed by the film webs are joined together at the upper edge of the bag so that the reclosure is then concealed within the film wrapping bags. The method of claim 8, wherein the first film web is provided at a uniform distance in the production direction with a marker. The method of claim 8 or 9, wherein at least one of the film webs is provided at a uniform distance in the production direction with openings (8), in each of which a closure slide (4) is arranged. Method according to one of claims 8 to 10, wherein a portion of the profile sections (7) is removed at a uniform distance in the direction of production on the closure strip (5). Method according to one of claims 8 to 11, wherein in the film webs in each case a weakening line (10) is produced, which along the production direction sections on one side and sections on the other side of the profile sections (7) of the closure strip (5). The method of claim 12, wherein the lines of weakness are formed at least in sections (10) by a laser. Method according to one of claims 8 to 13, characterized in that the continuous strand with the two closure strips (5) is placed on the first film web before the second film web is fed and arranged on the first film web, the film strip and the strand. Method according to one of claims 8 to 13, characterized in that the second film web is arranged over the first film web before the strand with the two closure strips (5) is arranged between the two film webs.

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