ES2347699T3 - SIDE FOLDING BAG. - Google Patents

Abstract

The side folded bag has two front walls (1) that connect the side folds (2a,2b) and a lamellar handle loop (3) at one of the side folds. The handle loop is arranged transverse to the longitudinal direction of the side fold. The ends (4) of the handle loop are guided into the side folded bag through openings (5) at the front walls. The ends are fastened at the inner surface of the side fold. The ends of the handle loop are fastened at the inner surface of the side fold and at the inner surfaces of the front walls by the sealed seams. An independent claim is included for a method for manufacturing a side folded bag.

Description

Bag of lateral folds.

The invention concerns a bag of folds lateral with two front walls, some lateral folds that join the front walls, and a loop loop-shaped loop in one of the side folds, where the loop loop is arranged transversely to the longitudinal direction of the fold associated side and overlaps with its ends. It is also object of the invention a process for manufacturing the bag of lateral folds. The side fold bag is suitable especially for packaging pourable products, such as, for example, pellet feed for animals, detergent, material cat bed, common salt or building materials powdery or granular. With the help of the loop loop you can also easily transport large packaging bags and heavy

A bag with two front walls that are joined by a lateral fold tucked between the front walls, It is known from DE 36 34 238 C2. In the lateral fold a loop of loop is provided which is arranged transversely to the longitudinal direction of the lateral fold and overlaps this lateral fold with its ends. The ends of the loop loop they are fixed on the two front walls by means of seams Hot stamping. Since all the forces of traction acts on relatively small welding, by elliptical example, there is a high risk of tearing, especially in the case of heavy loads. In addition, the loop loop seated with its ends on the front walls impairs the appearance optical.

A packaging bag made of material film, with a loop loop on one of the sides of the bag is known from DE 203 11 386 U1. Loop handle can be fixed to the inside of the packaging bag through a support label, then presenting the packaging bag made of film material in the loop loop area a access opening The manufacturing of the packaging bag made of film material is complicated. In addition, at the binding sites between the ends of the loop loop and the film of the bag packaging made of film material can be presented, in the case heavy loads, great forces that lead to tearing of the loop loop.

A bag of side folds with a loop of handle in a lateral fold is known from EP 1 777 167 A1. The loop of loop, which runs in the longitudinal direction of the associated lateral fold, is formed by a stretch of the film of the bag limited on the edge side by a few slits and is covered on the inner side of the bag by a closing sheet. He loop loop is concealed in the fold side.

Another execution of a fold bag sides with a carrying handle on a side fold is known  by EP 1 792 722 A1. The carrying handle has a film strip with an accessible handle section in use through an opening of a bag film. The film strip hugs with its ends to a support sheet through which the strip of film is attached laterally with the inner side of the bag. Thanks to the described configuration, a force distribution over a large area.

The side fold bags that present a loop handle integrated into a side fold are optically attractants, since the loop loop is arranged in one place concealed and the entire front face can be used to Apply printed material. The fact that, for the manufacturing, several sections of film one have to be arranged over another. In particular, in case of side fold bags prefabricated not filled partially unfolding is observed desired of the lateral fold provided with the carrying handle, so that the stacking capacity of the side fold bags Prefabricated and flattened is unsatisfactory.

Given this background, the invention is based on the problem of indicating a bag of side folds with a loop handle that can be stacked well as flattened bag before filling of the same and present at the same time a good ability to load. In particular, through the configuration and arrangement of the loop loop is intended to enable good mobility by the prefabricated side fold bag machine in filling facilities

Starting from a bag of side folds with The features described at the beginning, the problem is solved according to the invention by the fact that the ends of the loop loop have been introduced into the bag of side folds through front wall openings and have been fixed to the face inside of the associated lateral fold. Compared to a fixing to the outer face, a force distribution is achieved uniform and, therefore, greater bearing force. Since the Loop loop ends have been introduced into the bag lateral folds through the openings and have been fixed to the associated lateral fold, no optical damage results for the front walls. Preferably, on the inner side of the bag is not provided a cover of the openings by means of Additional film labels, bringing the fold bag laterals can be manufactured especially easily and cheap. The loop loop is usually angled in accordance with the lateral fold placed between the front walls and is fixed with its ends in the area of the longitudinal edges. In the area of the central bending line of the lateral fold that runs in longitudinal direction are not provided here usually neither sealing seams nor film labels additional, so that there is no fold unfolding side in a flattened side fold bag or just Look at this unfolding to a small extent.

Within the framework of a preferred execution of the invention the loop loop is fixed with its ends to the face inside of the lateral fold by means of hot stamping. He loop loop is formed here by a heat sealable material, by example a single or multi-layer polyethylene film. At framework of the invention can also be provided as a loop of handle a strip of film that is folded over itself to increase load bearing capacity. Conveniently, the loop The handle can also be attached to the inner faces of the front walls by means of sealing seams. It can get a fixation both to the inner side of the side fold as to the inside face of the front walls when seams  sealing, when manufacturing the side fold bag, it occur after placement of the lateral folds between the front walls.

In the context of the invention the folds lateral and front walls can be formed by strips of independent material. However, it is planned preferably the side fold bag is formed by hot folding and sealing of a bag film. The movie bag is configured here preferably in several layers with a heat sealable polyolefin layer on the inner side of the bag. For example, films composed with a outer face of ethylene polyterephthalate (PET) and a face polyethylene (PE) interior. Between the inner layer and the layer outer layers may be arranged, without restriction, other layers of film, for example to increase the stability and / or the action of barrier. Within the scope of the invention, they can also be used composite materials with an outer layer of polypropylene biaxially oriented (BO-PP) or with layers of different types of polyethylene, preferably being made the polymer composition of the inner face such that, at an adequate sealing temperature, only the face is melted inside. Stock films that are fully formed Polyolefins are characterized by a good ability to recycling.

When on a longitudinal edge they are joined several stretches of film or the edges of a bag film with the one formed by the side fold bag is not required there necessarily a continuous joining line, for example in shape of a longitudinal sealing seam. In addition, it is expected preferably also a seam sealing seams lengths formed by folding the bag film. The Longitudinal sealing seams can serve here as reinforcement of the side folds and can also be used so especially advantageous to close tightly, within the framework of the invention, openings provided in the front walls. Longitudinal sealing seams in the lateral fold provided with the loop loop can run straight here all the longitudinal edge and can be so wide that they cover the openings arranged at a small distance from the edges Longitudinal Within the framework of the invention it can be provided also that the longitudinal sealing seams present in the area of the openings a displaced part that moves away from the edge associated longitudinal and extend on the front faces Around the openings. The openings are then arranged in areas that are completely separated from the inside of the bag by the longitudinal sealing seams that join the walls lateral with the associated lateral fold.

When, for example in case a loop loop that can be sealed only on one side, be provided only a fixation in the associated lateral fold, they are conveniently provided in longitudinal direction about sealing seams that, due to a displaced part that moves away of the longitudinal edges, they extend around the ends of the loop loop, so that a closure is achieved Hermetic side folds bag.

In the context of the invention, the fold bag side also has a reapplicable closure that is formed preferably by profiled strips embedded with each other. He reapplicable closure may be arranged, for example, in the lateral fold opposite the loop loop, being able to fold down preferably the lateral fold out in the area of the reapplicable closure to form a spout. Given that the side fold bag has to be held by the loop loop during the extraction of the loading material, it is also possible, especially in the case of heavy side fold bags, An exact dosage.

It is also the object of the invention a procedure to manufacture the side fold bag described above according to claim 8. In this case, first practice two respective openings in sections of a band of material. The material band is preferably provided a bag movie that can be kept ready as a band endless and that, for example, can be removed from a roll. TO Then, some strips of film provided as loop loops of the side fold bags and that, by example, they can be cut on a feeding belt, and they introduce said strips with their ends in the openings from the front side of the material band. Then they are formed by folding the material band side fold bags preformed from the sections of this band, equipped with two front walls and side folds that join the walls front, so that in each of the front walls one of the openings is placed adjacent to the fold side overlapped by the film strip. In another step preferably subsequent to the procedure the ends are fixed  from the film strip to an inner face - formed on the side back of the material band- of the fold bag preformed sides in the associated lateral fold and preferably also on the front walls.

The openings in the sections of the band material are preferably formed by means of incisions parallel, being able to be provided in principle also some narrow die cut, for example to facilitate the stringing of The ends of the film strips. The ends of the strips of film can then be introduced especially simple, with a suction cup, in the openings formed.

To prevent the strips from slipping film during bonding of the material band, can be fold its ends after inserting them into the openings and these can be fixed previously to the back side of the band material. For this purpose, welding points or individual glue. Preferably, fixing the strips of film on the back side of the material band is made after folding said band of material, fixing the ends of the heat sealing film strips both at Side fold associated with the front walls. The side anterior band of material, which forms the outer face of the side fold bags, it is conveniently formed here by a film layer that is not heat sealable or whose temperature of sealing is located above the sealing temperature of a film layer on the inner side of the bag. Within this execution can be avoided that, when fixing the strips of film, the outer face of the lateral fold is also joined with the strips of movie. To avoid sealing the film strips with me they can be introduced here in the lateral fold placed during the folding of the material band between the walls front and overlapping by the strips of film, before the fixing these strips film by hot stamping, a strip of separation, for example a Teflon tape that is removed from New after hot stamping. Seams of sealing with the ones that fix the film strips preferably form sections of longitudinal sealing seams that extend substantially along the longitudinal edges of the fold side. In the area of the openings the sealing seams Longitudinal can extend each of them around the openings away from the associated longitudinal edge, thereby Get a tight seal of the openings.

Finally, in the band of folded material and provided with film strips like loop loops can be cut preformed side fold bags, open at least in one side. Preformed and flattened side fold bags They can be stacked and filled and closed in filling facilities. Within the framework of the invention they can be formed in a manner especially simple side fold bags with a high load bearing capacity which, in a state of filling and despite the fixing of the carrying handle to the inner side of the bag, are completely hermetic and guarantee a long preservability of the filling product collected.

The invention is explained below by helping of a drawing that represents only one embodiment. They show:

Figure 1, a side fold bag according to the invention in a perspective view,

Figure 2, a section along the line A-A of Figure 1,

Figure 3, a procedure for manufacturing the side fold bag in a schematic view,

Figure 4 and Figure 5, individual steps of the procedure for manufacturing the side fold bag Y

Figure 6, a detail view of a seam of longitudinal sealing in the area of an opening of a wall front of the side fold bag.

Figure 1 shows in a perspective view a side fold bag according to the invention. The bag of side folds has two front walls 1, some folds sides 2a, 2b joining the front walls 1 and a loop loop 3 in the form of a strip in one of the lateral folds 2a. The loop of handle 3 is arranged transversely to the longitudinal direction of the lateral fold 2a and hugs it with its ends 4. The walls front 1 have two openings 5 through which insert the ends 4 of the loop of loop 3. The ends 4 of loop of loop 3 are attached both  on the inner face 6a of the associated lateral fold 2a as in the inner faces 6b of the two front walls 1 by means of longitudinal sealing seams 7 that extend throughout the length of the lateral fold 2a and presenting, in the area of the openings 5, a displaced part that moves away from the edge associated longitudinal 8. In the detail view of Figure 6, you can see that the longitudinal sealing seams 7 in the lateral fold 2a provided with loop handle 3 extend over the front walls 1 around the openings 5. Due to the continuous longitudinal sealing seams 7, which have a displaced part in the area of the openings 5, these openings 5 are reliably separated from the interior space of the bag lateral folds, also achieving a distribution of especially uniform force of the cover load. Thanks to the described arrangement and fixation of loop loop 3 can be avoided safely a tear of loop loop 3 and especially a Tear propagation of openings 5.

On the side fold 2b opposite the loop loop 3 a reapplicable closure 9 is provided that can be folded down out to form a pouring mouth. Apart from easy transport of heavy loads, loop loop 3 also enables a exact positioning. While, during the extraction of loaded product, the weight of the side fold bag can be held with a user's hand through the loop loop 3, you have to, by a slight inclination of the bag of side folds with the other hand, you can determine exactly the desired amount of extraction. Due to closure reapplicable 9, the loaded product left in the bag side folds can still be protected also after a first opening, over a prolonged period of time, against environmental influences, for example against humidity.

The sectional representation of Figure 2 it allows to appreciate that the zones in which the openings 5 of the front walls 1 are completely separated of the interior space of the side fold bag by the longitudinal sealing seams 7. Since the ends 4 of the loop loop 3 are fixed to the inner face 6a of the fold lateral 2a and, in addition, to the inner faces 6b of the walls front 1, it is a distribution of force especially uniform and therefore also a bearing force especially high.

The procedure to make a bag of lateral folds is schematically represented in the figure 3. A stock market movie, which features an anterior side 10 of a non-sealable or hard-sealable material, for example PET or BO-PP, is fed as a material band 11. By on the contrary, the rear side 12 of the material band 11 is formed by a heat sealable layer, for example of PE, of the multilayer bag film. In stretches evenly distanced 13 from the band of material 11 two incisions are formed parallel running in the longitudinal direction. How I know depicted in detail in figure 4, some strips of film provided as loop loops 3 and these are introduced with its ends 4, from the front side 10 of the material web 11 in the openings 5 formed by the incisions, for example by middle of a suction cup. Then the ends 4 are retracted of the film strip and these are fixed previously to the side back 12 of the material band 11 by means of points of welding 14. Next, the material strip 11 of the material is folded such that, from the respective sections 13 provided with a strip of film as loop loop 3, some are obtained preformed side fold bags with two front walls 1 and side folds 2a, 2b that join the front walls 1. Folding is done in such a way that on each of the walls front 1, one of the openings 5 is arranged in an adjacent position to the lateral fold 2a overlapped by the film strip. Folds sides 2a, 2b and a central section of the film strip are then placed between the front walls 1. The edges Longitudinal 8 of the lateral folds 2a, 2b are provided then of longitudinal sealing seams 7, extending  the longitudinal sealing seams 7 in the area of the openings 5 around said openings 5 and away from the edge associated longitudinal 8 such that they close tightly the openings 5.

As depicted in Figure 5, the ends 4 of the film strips are fixed both to the inner face 6a of the previously formed lateral fold 2a as to the inner face 6b of the front walls 1. Since the front side 10 of the material band 11 that forms the outer face of the bag lateral folds is not sealable or is only hard sealable, the film strip does not bond with the outer face of the bag lateral folds during hot stamping. To avoid the strips of film placed between the front walls 1 are seal with themselves, a PTFE tape is placed before sealing hot. They can then be separated from the band of material 11 individual side fold bags preformed that are unclosed at least at one end, seen in the longitudinal direction of the material band 11. The formation of bottom 16 and top edge 17 of the bag lateral folds can be made in a usual way within the framework of the invention and, for this reason, has not been described with detail.

Preformed side fold bags can be kept ready as a pile and can be filled and Finally close in a filling device. Due to the especially simple configuration and arrangement of the loop handle 3, which is fixed in the area of the longitudinal edges 8 of the side fold bag, these side fold bags according to the invention they can undergo further elaboration with especially easy, especially observing only a small unfolding of the preformed side fold bags in the area of the lateral fold 2a provided with the loop loop 3.

Claims (12)

1. Bag of side folds with two front walls (1), side folds (2a, 2b) that join the front walls (1), and a loop loop (3) in the form of a strip in one of the side folds ( 2a), wherein the loop of handle (3) is arranged transversely to the longitudinal direction of the associated lateral fold (2a) and overlaps it with its ends (4), characterized in that the ends (4) of the loop of handle ( 3) they have been introduced into the bag of lateral folds through openings (5) of the front walls (1) and have been fixed to the inner face (6a) of the associated lateral fold (2a). 2. Bag of side folds according to claim 1, characterized in that the ends (4) of the loop loop (3) have been fixed to the inner face (6a) of the side fold (2a) and to the inner faces (6b) of the front walls (1) by means of sealing seams. 3. Side fold bag according to any one of claims 1 or 2, characterized in that the longitudinal edges (8) of the side fold bag are reinforced by longitudinal sealing seams. 4. Bag of lateral folds according to claim 3, characterized in that the longitudinal sealing seams (7) have in the area of the openings (5) a displaced part that moves away from the associated longitudinal edge (8) and extends over the openings (5) of the front walls (1) or preferably around said openings (5). 5. Side fold bag according to any one of claims 1 to 4, characterized in that the side fold bag has been formed by hot folding and sealing from a multi-layer bag film having a heat sealable layer on the inner side of the bag. 6. Side fold bag according to any one of claims 1 to 5, characterized by a reapplicable closure (9) which is preferably arranged in the side fold (2b) opposite the loop of handle (3). 7. Procedure for manufacturing a bag of lateral folds according to any of claims 1 to 6, in which they are practiced in sections (13) of a material band (11) two respective openings (5), in which filmstrips are fed and they introduce these with their ends (4) into the openings (5) from a front side (10) of the material band (11), in which they are produced by folding the band material (11), from the sections (13), some bags of folds preformed sides with two front walls (1) and some folds sides (2a, 2b) that join the front walls (1), of such so that in each of the front walls (1) a of the openings (5) adjacent to the lateral fold (2a) overlapped by the film strip, and in which the ends (4) of the strips are fixed of film, in the associated lateral fold (2a), on one side internal - formed by the back side (12) of the material band (11) - of the preformed side fold bag. 8. Method according to claim 7, in which forms the openings (5) in the sections (13) of the band of material (11) by means of parallel incisions. 9. Method according to claim 7 or 8, in which the ends (4) of the film strips are retracted after introducing them into the openings (5) and these are fixed before the back side (12) of the material band (eleven). 10. Procedure according to any of the claims 7 to 9, wherein the ends (4) of the film strips in the openings (5) with a suction cup. 11. Procedure according to any of the claims 7 to 10, wherein it is introduced into the fold side (2a) placed during the folding of the material band (11) between the front walls (1) and overlapped by the strip of film a separation strip (15) before they are fixed by Hot stamping the ends (4) of the film strips. 12. Procedure according to any of the claims 7 to 11, wherein they are arranged in the area of the openings (5) sealing seams covering the openings (5) or that extend around said openings (5), away from the associated longitudinal edge (8), such that they close Hermetically said openings (5).