ES2310875T3 - SHEET BAG AND PROCEDURE FOR MANUFACTURING. - Google Patents

Abstract

The bag has a resealable closure (8) arranged at an inner surface of a lateral fold (4) below a top sealing seam (7). A weakened line (21) is arranged to open the fold in the area of closure, and material strips (23, 24) of the outlet are connected with the inner surface of the fold. A section bridging a region of the line has an end, at which a strip-shaped connecting unit (14) of closure is formed. Outer edges (11) formed as folding edges are stiffened by parallely running longitudinal sealing seams (12), which extend till the top sealing seam and are interrupted in the area of the closure. An independent claim is also included for a method for producing a film bag.

Description

Foil bag and procedure for manufacturing.

The invention relates to a foil bag, which is formed through the folding of a sheet, which presents a front surface, a rear surface, a first fold inserted lateral as well as a second inserted lateral fold and it is closed by means of a longitudinal sealing seam so as of a sealing seam of the head,

in which in the inner surface of the first lateral fold under the seam sealing of the head is arranged a closure again, which is consisting of two strips of material with closure elements in ribbon shape integrally formed,

in which the outer edges between the first lateral fold and the surface adjacent front or rear are made up of edges of fold and

in which first lateral fold forms a spill zone that can be closed again, when the lateral fold is opened along a line of weakening arranged above the closure elements in the form of slats.

The foil bags with the structure described They are suitable for packaging bulk products, for example dry food for animals, and present a closure again, which allows emptying or extracting the contents of the container in quantities partial, that is, in portions. Extraction is done through of an opening in the first lateral fold, and the lateral fold after opening the closure again and It can be used as a landfill. The opening can be closed from new. The slat-shaped closure elements can be perform as groove and tongue elements, which are connected manually with each other by pressure and then form a retaining union or clip. The closure is also designated as Velcro closure.

It is known from document DE 201 15 181 U1 a side fold bag with an extraction opening which can be closed again in a lateral fold. Folds laterals consist of strips of separate sheets, V-shaped folded, which are inserted between the surface front and back surface of the bag and that are attached with these by means of longitudinal sealing seams. For the Sealing of the foil bag requires wide seams, that rigidly form outer edges of the bag and that lend good shape stability to the foil bag. Without However, it is an inconvenience that the sealing seams limit in a considerable measure the width of the opening of the closure of again, which makes extraction difficult, especially as a product of Stuffed slightly larger pieces.

It is known from WO 2004/092925 A2 a bag of sheets with the characteristics described at beginning. It consists of a folded sheet to form a flexible tube. The flexible tube generated through folding It has inserted side folds and is closed on the side envelope by means of a longitudinal sealing seam. In the inner surface of the foil bag is fixed a ground closing again, which connects one of the side folds of removable shape with front surface and surface adjacent back of the bag. The closing strip is again long than the width of the side fold and is fixed on the side inside the lateral fold as well as on adjacent surfaces of the bag, which form the front surface and the surface rear of the bag. The shape stability of the foil bag It is not satisfactory. During use, the area is opened excessively pouring, losing the bag greatly its shape on the side Extraction By virtue of reduced stability, it hinders the manipulation of the open bag. Especially in the case of large bags, the manipulation of the open bag and the Dosed extraction of filled product requires a skill considerable user.

It is also known from document WO 02/079049 A1 a similar foil bag with an opening of Extraction that can be closed again in a lateral fold.

In the foil bags described previously, a strip of closure material is again fixed, respectively, on the inner surface of the lateral fold and the another strip of material is fixed on the front surface and the respective adjacent rear surface of the foil bag. During the manufacture of the bag they must be engaged with each other the closing elements corresponding to each other, which are arranged on the inner surface of the lateral fold or in the interior surfaces of the front surface or of the rear surface This requires a position sufficiently exact sections of material strips and folds accurate. Inaccuracies during folding or during placement of the strip of material on the sheet strip can lead to interference during continuous manufacturing of the bag. The manufacture of the bag is difficult to a certain extent considerable through the application of closing again.

Given this background, the invention has the commissioned to indicate a bag of side folds, which is of stable form during use and presenting an opening of extraction that can be closed again in the area of the folds lateral, which uses the full width of the lateral folds. The closing placement should be possible in a way simple in the course of manufacturing the bag.

The task is solved according to the invention by means of a foil bag with the characteristics indicated in claim 1. The weakening line for the Opening of the side folds is arranged according to the invention in the closure zone again, in which one of the two strips of closure material is reconnected below the weakening line with the inside surface of the fold side and in which the other strip of material is connected by above the weakening line in the same way with the inner surface of the lateral fold as well as presents a section that covers the area of the weakening line, in whose end is integrally formed the closure element in the form of  ribbon, associated with it, closing again. In addition, the songs exteriors configured as fold edges are reinforced, of according to the invention, by means of sealing seams longitudinal extending in parallel, which extend until the head seam seam and are interrupted in the closing zone again.

The closure again forms a Velcro closure preassembled that consists of two strips of material, whose slat-shaped closure elements are engaged with each other. In The course of manufacturing the bag, the strips of material they are placed on the sheet first flat or on a flat sheet band and connect with it. Both strips of material are fixed by means of sealing seams, which extend  in parallel to the closure elements, in the sheet strip.

The weakening line may be constituted by a rupture perforation, which is transparent. For  ensure that the foil bag closes tightly in the air the packaged product until it is consumed for the first time, the line of weakening is framed preferably by a sealing seam, which connects the strip of closure material again, covering the weakening line, with the surface inside of the side folds and form in an overlapping area of the two strips of material a peelable bond between the strips of material. The section of peelable seam fulfills a function of shutter until the foil bag is opened for the first time and It comes off when the extraction opening is broken.

After you close them again prefabricated have been placed on the flat sheet band and have been connected to it, the sheet band goes through folding stations, in which they are formed through folding front surfaces and rear surfaces of the foil bags as well as side folds are inserted. The Closing placement can be integrated seamlessly in continuous procedures for the manufacture of bags of sheets. The longitudinal sealing seams provided for the Edge reinforcement are lowered in the area of the closure of new. This has no influence on the tightness, since the outer edges of the first lateral folds They are fold edges and longitudinal sealing seams placed additionally do not have any function of obturation.

Foil bags are manufactured as bags placed flat and only subsequently filled in facilities filling with filling product, which is filled, for example, to through an opening on the bottom side or - before the application of head sealing seams - at the end top of the bag. For transport the bags are stacked flat placed sheets. In this case, the closes again on the fold or flex edges of the bag of sheets. The strips of material, especially the elements of slat-shaped closure, have recovery properties considerable elastic, which counteract the flexion and have as consequence that the bags of flat placed sheets extend  in the area of the first lateral folds. in the messure that increases the stacking height there is then the danger of that the stacked bags overlap. To avoid this, the slat-shaped closure elements of the closure again of according to a preferred configuration of the invention are interrupted in bending edges of the foil bag through of a print or a cut. The closure again fixed in the inner surface of the first lateral folds presents with preference a length corresponding to the width of the lateral folds and extends to the outer edges of the bag. In the center between the two ends, the closure elements are cut, to avoid an elastic recoil of the folds flat placed sides.

According to an advantageous configuration of the invention, all four outer edges of the bag sheets are reinforced by means of sealing seams longitudinal. The longitudinal sealing seam, which closes the foil bag on the enveloping side, can be integrated into a singing, which delimits the second lateral fold. In this form of embodiment, the longitudinal sealing seam, which closes the bag of sheets on the enveloping side, connect the second fold side with the front surface or the rear surface of the bag.

Since closing the bag again sheets are not at the highest point of the bag, it could happen during emptying, fill product accumulates outside the Close again and disturb the pouring process. To avoid this, according to another preferred embodiment of the invention, the front surface and the back surface of the bag are joined by means of an additional vertical sealing seam, which it is arranged next to the first lateral fold, extends to the Seam sealing the head and separates the area of the folds side, above closing again, of a product space Filling the bag. At the lower end of the seam of additional vertical sealing can still be connected a seam of transverse seal, which extends to the second zone lateral folds and separates the area of the bag, above the Close again, of the product filling space of the bag. The cross-seam seam extends in a way convenient inclined with respect to the sealing seam of the head, being the distance between the transverse sealing seam and the sealing seam of the head at the first end, which is adjacent to the additional vertical sealing seam, less than in the other end in the area of the second lateral fold. The section of the foil bag, delimited by the sealing seam of the head and by the transverse sealing seam, can be used, In addition, for a grip stamping.

For the first opening of the foil bag, the foil bag must be opened along the line of planned weakening in the closing zone again. On the side outside of the foil bag you can print cut lines to facilitate handling. In addition, the weakening line conveniently presents an arc, which forms, after the opening of the lateral fold, a tab for the extraction of the discharge zone.

Object of the invention is also a method according to claim 12 for the manufacture of the foil bag described. The claims 13 to 16 refer to preferred configurations of the process.

Next, the foil bags are explained according to the invention as well as the method of manufacturing according to the invention with the help of examples of realization. The following is shown schematically:

Figure 1 shows a fold bag open sides in a perspective representation.

Figure 2 shows a side view of the side fold bag shown in figure 1 in the not open state and no filling product.

Figure 3 shows a section through the side fold bag not open in the cutting plane A-A of figure 2.

Figure 4 shows a section through the side fold bag open on the cutting plane B-B of figure 2.

Figure 5 shows another configuration of the side fold bag in a side representation corresponding to figure 2.

Figure 6 shows the steps of the procedure for the manufacture of an extraction opening that can be close again in the course of manufacturing the bag, Y

Figure 7 shows the arrangement of seams sealing in a newly placed closure in the area of the folds lateral.

The foil bag represented in the figures It is formed by folding a sheet 1 and presents a front surface 2, a rear surface 3, a first lateral fold 4 inserted as well as a second lateral fold 5 inserted. The foil bag is closed by means of a seam of longitudinal sealing 6, a sealing seam of the head 7 and a bottom seam seam not shown. On the surface inside the reed bag under the seam sealing head 7 is arranged a closure again 8 which is consisting of two strips of material 23, 24 with closure elements 14 in the form of a fully formed slat. For the extraction of Filling product should open the lateral fold 4 along a weakening line 21, which is arranged above the closure elements 14 in the form of a ribbon, meshed together peelable form. Accordingly, the first lateral fold 4 it forms a pouring zone 10 that can be closed again.

From a comparative consideration of the Figures 1 to 3 clearly show that the weakening line 21 for opening the lateral fold 4 is arranged in the area of closing again 8. One of the strips of material 23 of the closure again 8 is connected below the weakening line 21 with the inner surface of the lateral fold 4. The other strip of material 24 is connected above the weakening line 21 in the same way with the inner surface of the side fold 4 and presents a section, which covers the area of the line of weakening, at whose end the integral is formed closure element 14 in the form of a ribbon associated with it of the closure again 8. The closure elements 14 formed integrally in the two strips of material 23, 24 are configured as elements groove and tongue and form, so to speak, a Velcro closure, whose closure elements can be tied together through pressure exerted with the hands. The ends of the elements of close 14 that collaborate in pairs are fixedly connected each other, for example they are soldiers. In the bending edge 15 of the side fold 4 inserted, the closure elements 14 in the form of Ribbon are interrupted by a stamping 16 or a cut. The measure prevents an extension of the area of lateral folds due to at a bending tension of the projections in the form of a slat of the closing elements 14.

In a comparative consideration of the figures 1 to 3, it is further shown that the outer edges 11 between the lower lateral fold 4 and front or rear surface 2, 3 adjacent are made up of crease edges, which are reinforced by means of longitudinal sealing seams 12 which They extend parallel. The longitudinal sealing seams 12 are extend from the bottom sealing seam not shown until the sealing seam of the head 7 and are interrupted in the closing zone again, there at least in the zone of the closure elements 14 in the form of a ribbon. Also the second lateral fold 5 is delimited by outer edges 11 ', which They are reinforced by means of 12 'longitudinal sealing seams. The longitudinal sealing seams 12 on the outer edges 11 'of the second lateral fold extend without interruption from a bottom seal seam not shown until the seam of sealing of the head 7. From the representation of the section cross section of figure 3 it follows that the sealing seam longitudinal 6, which closes the foil bag on the side envelope, is placed inside the outer edge 11 'of the second lateral fold 5 and the second lateral fold 5 is connected to the front or back surface of the bag. This sealing seam 6 fulfills a sealing function, while the sealing seams 12, 12 'associated with the other edges exterior 11, 11 'only reinforce the fold edges and not They have no shutter function. Closing again 8 which is disposed on the inner surface of the first lateral fold 4, has a length that corresponds to the width of the fold side 4 and extends to the outer edges 11 of the bag.

In the exemplary embodiment of Figure 2, the front surface 2 and rear surface 3 of the bag are connected by means of an additional vertical sealing seam 17, which is arranged next to the first lateral fold 4, is extend to the sealing seam of head 7 and separate the area of the lateral folds, above the closure again, of a product filling space 18 of the bag. Sewing additional vertical sealing 17 prevents during emptying of the bag, filling product accumulates in the lateral area outside the Close again and may disturb the pouring process.

In the embodiment shown in the Figure 5, at the lower end of the additional sealing seam vertical 17 a transverse sealing seam is still connected 19, which extends to the area of the second lateral fold 5 and separate the entire section of the bag, above the closure strip again 8, of the product filling space 18 of the bag. The transverse sealing seam 19 extends inclined with relation to the sealing seam of the head 7, in which the distance between transverse seal seam 19 and seam of sealing the head 7 at the first end, which is adjacent to the additional vertical sealing seam 17, is smaller than in the other end in the area of the second lateral fold 5. The seam of transverse seal 19 favors a complete emptying, free of waste, from the bag. The section of the foil bag, bounded by the sealing seam of the head 7 and the seam of transverse seal 19, can be used additionally for a grip print 20.

From figure 1 it follows that the line of weakening 21 configured, for example, as perforation of breakage, presents an arc 25, which forms, after the opening of the lateral fold, a tab 20 for the extraction of the area of pouring 10.

The procedure for the manufacture of the ball of sheet described is explained below with the help of the Figure 6. In a flat sheet band 26, in a first stage of the procedure, weakening lines 21 are performed, which are extend transversely to the direction of the band and are arranged in a strip-shaped section of the material band, starting of which a lateral fold 4 is formed at a later stage of the process. The closures again 8 are constituted by two strips of material 23, 24, which are connected so removable through the intervention of closure elements 14 in the form of a ribbon. The strips of material 23, 24 connected between yes detachably placed in the area of the lines of weakening 21 transversely to the direction of the band on the flat sheet band 26, such that one of the two strips of material 24 covers the associated weakening line and the slat-shaped closure elements 14 extend parallel to the line of weakening 21. The strips of material 23, 24 of the closures are connected again with the foil band flat 26 by means of sealing seams 27, 28, which are arranged on both sides of the closure elements 14 in the form of ribbon and parallel to these. Then the sheet band 26 crosses a folding station not shown, in which fold the foil band and form a band with a surface front 2, a rear surface 3 and side folds 4, 5 inserted. The sheet band then goes through other stations neither represented, in which the fold edges are reinforced with longitudinal sealing seams 12 and the layers of overlapping sheets to form a bag extension, which consists of bag-shaped sections, from which They can separate the foil bags. In the closing zone again the longitudinal sealing seams 12 serving are interrupted for the reinforcement of the fold edges.

From the representation of figure 7, it follows that the closure elements 14 in the form of a ribbon of the strips of material that form the closures are again cut into the places, which are associated with the bending edge 15 of the fold side 4 or are provided with a notch 16. In addition, it has indicated that the ends 29 of the closure elements that are in retention gear, they are fixedly connected to each other, by example, through gluing or welding.

The weakening lines 21 are constituted by an air permeable perforation. To ensure that the foil bag closes air tightly packaging product until the first use, a seam of sealed 28 as a closed frame around the line of weakening Sealing seam 28 connects the strip of material 24, which covers the weakening lines, with the band of sheet 26 and forms in an overlapping zone of the material strips which form the closure again a peelable union 28 'between the two strips of material 23, 24. The arrangement of sealing seams 27, 28, 28 'fulfills a shutter function until the first opening of the foil bag and detaches during the breakage of the extraction opening by virtue of its reduced resistance to bare.

Claims (16)

1. Foil bag, which is formed through the folding of a sheet (1), which has a surface front (2), a rear surface (3), a first side fold (4) inserted as well as a second lateral fold (5) inserted and It is closed by means of a longitudinal sealing seam (6) as well as a head seam seam (7),

in which in the inner surface of the first lateral fold (4) below the Seam sealing the head (7) is arranged a closure of new (8), which consists of two strips of material (23, 24) with closure elements (14) in the form of a slat formed integrally,

in which the outer edges (11) between the first lateral fold (4) and the adjacent front or rear surface (2, 3) are constituted by fold edges and

in which first lateral fold (4) forms a pouring zone (10) that is you can close again, when you open the side fold (4) at along a line of weakening (21) arranged above the closure elements (14) in the form of slats,

characterized in that the weakening line (21) for opening the lateral fold (4) is arranged in the closing area again (8),

in which one of the material strips (23) of the closure again (8) is connected below the weakening line (21) with the surface inside the lateral fold (4) and in which the other pulls material (24) is connected above the line of weakening (21) in the same way with the inner surface of the lateral fold (4) as well as presents a section that covers the area of the weakening line (21), at whose end it is integrally formed the closure element (14) in the form of a ribbon, associated with it, closing again (8), and

because the outer edges (11) configured as fold edges are reinforced by means of longitudinal sealing seams (12) extending in parallel, which extend to the sealing seam of the head (7) and are interrupted in the closing zone again (8). 2. Sheet bag according to claim 1, characterized in that the weakening line is framed by a sealing seam, which connects the strip of material (24), which covers the weakening line, with the inner surface of the lateral fold (4) and in a zone of overlap of the two strips of material (23, 24) forms a peelable joint between the strips of material (23, 24). 3. Sheet bag according to claim 1 or 2, characterized in that the slat-shaped closure elements (14) are interrupted in bending edges of the sheet bag through a stamping (16) or a cut. 4. Sheet bag according to one of claims 1 to 3, characterized in that the closure again (8), fixed on the inner surface of the first lateral fold (4), has a length corresponding to the width of the lateral fold and extends to the outer edges (11) of the bag. 5. Sheet bag according to one of claims 1 to 4, characterized in that the ends of the closure elements (14) that collaborate in pairs are fixedly connected to each other. 6. Sheet bag according to one of claims 1 to 5, characterized in that the longitudinal sealing seam (6), which closes the sheet bag on the wrapping side, connects the second side fold (5) with the front surface or rear (2, 3) of the bag and forms an outer edge. 7. Sheet bag according to one of claims 1 to 6, characterized in that the front surface (2) and the rear surface (3) of the bag are joined by means of an additional vertical sealing seam (17), which it is arranged next to the first lateral fold (4), extends to the sealing seam of the head (7) and separates the area of lateral folds, above the closure again, from the product filling space (18) of the bag. 8. Sheet bag according to claim 7, characterized in that a transverse seal seam (19) is connected to the lower end of the vertical additional sealing seam (17), which extends to the area of the second lateral fold ( 5) and separate the bag section, above the closing strip again (8), from the product filling space (18) of the bag. 9. Sheet bag according to claim 8, characterized in that the transverse seal seam (19) extends inclined with respect to the head seal seam (7), in which the distance between the transverse seal seam (19) and the sealing seam of the head (7) at the first end, which is adjacent to the additional vertical sealing seam (17), is smaller than at the other end in the area of the second lateral fold (5) . 10. Sheet bag according to claim 8 or 9, characterized in that the section of the sheet bag, delimited by the sealing seam of the head (7) and the transverse sealing seam (19), contains a stamping grip (20). 11. Sheet bag according to one of claims 1 to 10, characterized in that the weakening line (21) has an arc (25), which forms, after opening the lateral fold, a flange (20) for extraction of the discharge zone (10). 12. Procedure for the manufacture of bags of sheets according to one of claims 1 to 11, with The following procedure covers:

to)

in a flat sheet band weakening lines (21) are made, which extend transversely to the direction of the band and are they have in a strip-shaped section of the material band, to from which a lateral fold (4) is formed in one stage subsequent (d) of the procedure;

b)

be place closures again (8), which are constituted by two strips of material (23, 24), which are detachably attached to through the intervention of closing elements (14) in the form of ribbon, in the area of the weakening lines (21) transversely to the direction of the band on the sheet band flat, so that one of the two strips of material (24) covers the associated weakening line (21) and closing elements (14) in the form of a ribbon extend parallel to the line of weakening (21);

C)

the strips of material (23, 24) of the closures again (8) are connected with the flat sheet band by means of sealing seams, which they are arranged on both sides of the closure elements (14) in shape ribbon and parallel to these;

d)

to the sheet band is then folded, a band being formed multi-layered with a front surface (2), a surface rear (3) and side folds (4, 5) inserted;

and)

the fold edges are reinforced with sealing seams longitudinal (12), which are interrupted in the closing area again (8);

F)

with Other sealing seams connect the layers of sheets superimposed to form a bag extension, which is constituted by bag-shaped sections, from which you can separate the foil bags.

13. Procedure in accordance with the claim 12, wherein in step c) of the process place a sealed seam as a closed frame around the weakening line (21), which connects the strip of material (24), which covers the line of weakening, with the strip of foil and that forms in a zone of overlap of the strips of material, which form the Close again, a peelable connection between the two strips of material (23, 24). 14. Procedure in accordance with the claim 12 or 13, wherein in step a) of the process perforations are performed as weakening lines (21) in the flat sheet band. 15. Procedure according to one of the claims 12 to 14, wherein the closure elements (14) in slat shape of the material strips, which form the closures of new (8), they are cut in places, which are associated with the line of flexion of the lateral fold or are provided with a notch. 16. Procedure according to one of the claims 12 to 15, wherein the ends of the closure elements (14) which are in the gear of retention.