HUE026816T2 - Plastic film bag - Google Patents

Description

Ill invention relates to a bag according to the preamble of claim 1, lags of fbls type are known from EP 2 113 470 A or DE 33 03123 A, lags of the type addressed here are used in particular for lightweight materials made up of pieces, such as rolls of toilet paper and the like, and should be provided wih Cat least) one handle since they- are bulky and unwieldy-Although bags of this type come under fia considération of reducing materia! costs, they are also subject to the pressure of public interest in waste reduction and a general trend towards ever thinner plastics films, in fié meantime a film thickness of 40 pm and below being achieved. in terms of strength, for the most part a reduced wall thickness can he compensated by stronger materials in order to absorb the loads, in particular in the case of machine filling such bags. However, problems are caused by a filling space boundary between the filling space and the handle strip, which boundary il conventionally formed as a simple continuous sealed seam. With decreasing film thickness, however, sealed seems become increasingly delicate, since although the thin films lying on top of one another are connected by being melted together, they are not fused and out in the manner of a separation seam, During the usual machine-filling process, the bap manufactured in the conventional manner and having a lower film thickness, in which bags a handle strip, typically formed as a double-layer strip having a consistent width as far as the filling space, is delimited by a sealed seam and, externally and parallei thereto, by a separation seam, are then at the risk of the sealed seam between the filling space and the handle strip spÄif open and the filled bag therefore being damaged, as a result of the filling pressure of the goods and in particular also the opening strength of spreading tools.

The object of the invention is to provide a bag of the type- addressed here having a filling space and a handle strip in a form which can fee produced from a thin, sealable plastics film, a bag of this type being robust during filling and handling, in particular also in the critical transitional region between the filling space and the handle strip, ami which can be manufactured in a conventional manner without high technical complexity.

According to the Invention, this object is achieved by a bag according to the preamble of claim 1 and by the characterising features of claim 1.

It lias been shown that a separation seam, in the manner in which it is usedfor example on eater edges, can be made to be tar more resilient than a sealed seam if the film thickness is reduced, in particular into a range of below 40 pm. it has also been shown that the critical loads at the ends of the filling space boundary occur where tensile forces occur, produced by fling tools or spreading tools and also by the items inserted as the filling material, A modificafien of the bag, in which the outer edge of the handle strip formed by the separation seam is brought cioser to the filling space boundary, allows the robustness of the Pag to be improved compared with the conventional continuous sealed seam.

This improvement can be achieved using conventional means and thus without high complexity, since, until now, die separation seam was also applied as a closure seam. However, said seam now has a contoured shape which corresponds to the handle opening, Is spaced apart from the filling space boundary and is, moreover, brought closer to the filling space boundary. Compered Äh the conventional handle strip having a constant width, however the contoured shape usually requires a piece of waste material to be snipped off, which can be picked or suctioned off in a simple manner.

In this case the separation seam can foe brought close to a sealed seam provided in a conventional manner, in particular a straight, continuous sealed seam, so as to then protect the sealed seam from being tom open or In order to then critically prevent the sealed seam from toeing tom open fn the second line. In view of Ills, a distance of up to 5 mm between the Separation seam and the sealed seam is sufficient in order to protect the sealed seam, or at least to prevent the sealed seam from splitting open by using the separation seam located directly therebehind.

However, the separation seam can also be the filling space boundary.

Further embodiments of the invention can be found in the claims.

The single figure of the drawings shows a bag according to the invention in its ready-for-sale, folded-ffat form (shown partially in section). A bag, denoted overall in the drawings by reference numeral 1, made from plastics film having a thickness of below 40 pm, is, as shown, folded flat in the uhfled state, a front face 2 ansi a rear face 3 being interconnected on one side by a W-shaped side fold 4 and, on the other aide, ending so as to bo open at different and edges 3,6, When flat, the empty bag 1 is to be continuously produced from an “endless” double-layer film strip «Niob, in the drawings, extends upwards and in which the side fold 4 is formed, before separation is achieved by séparation seams in the form of a straight, transversely extending separation seam 7 mû a contoured separation seam 8 on the opposite side. A contour line 9 indicates, together with lateral contour lines ÍÖ and 11, the outline of a preceding bag.

During a corresponding filling process, the W-shaped side leid 4 gives the bag an angular cuboid shape. Without the side fold 4, the bag (directly delimited by the tot face 2 and the rear face 3 In a sealed seam) can be suceassfuiiy adapted to rounded flings such as cellulose rolls or the like.

The ba| 1 comprises a handle strip 12 having a handie opening 13. In the present case, the handle opening 13 Is not formed as a recess, but Instead In the form of a separation seam 14 in the shape of a tab having an edge formed as an open ring fC-shaped"), which separation seam then Interconnects the fim layers on the inside along the tab-shaped handle opening 13 and also outside on the handle strip 12. it is however clear that the edge contour can also be produced by punching, the film layers lying on top of one another remaining unconnected.

The handle strip 12, in which the films fie fiat Oh top of one another, is delimited relative to a filling space 1S, in which the films are spread apart to receive the fining items, by a filing space boundary 15, which, mere for the sake of conceptual distinction, is drawn at a small distance from the separation seam 8, but actually coincides at this point with the sapa ration seam 8. The filling space 15extends In parallel with the separation seam 7, which is advantageous both for cutting the bag during manufacture and for the filling process. The filling space 16 then extends between the separation searn 7 and the filling space boundary 15 In dlrecfon and from an outer edge l7 of the side fold 4, which is to ba unfolded during the filing process, as far as a filling limit 18, bom where, after a filing process, the films are pulled together In an approximately cuboid shape and Joined along a seam line 19 by a separation seam. A protecting {handling} region, which is also provided with pin holes 20 tor stacking, unfolds once the bag 1 has been closed.

Wfmmm eonverdlenai handle strips is this type of hag were provided with a continuous width which remained the same and with which the entire region between the contour line 9 lorfhe preceding hag and the filing space boundary 15 was used as a handle strip and the bag 1 was thus closed without waste-material corners, the bag according to the invention has a spéci®! shape in the region of the handle strip.. This aiiows for the separation seam S in the longitudinal portions on both sides of the handle opening 13 to be brought closer to the filling space boundary. In the outer regions 21 and 2:2. the separation seam 8 extends directly aibng the filling space boundary 15. These outer regions are exposed to critical loads when the bag is being lied. The filled hag is also particularly heavily loaded In these outer regions during transportation and handling. Therefore, it is important that the separation seam, having is higher strength, is used at these longitudinal portions of the lining space boundary. This does not exclude the provision of another sealed seem on the inside with respect to tha separation seam, in order to close the filling space boundary in particular in the case of filling material mads up of small parts. A sealed; separation seam, i.e, a separation seam extending up to approximately 5 mm behind such a sealed seam along the ff|hg space boundary 15, is able to protect the weaker sealed seam from splitting open or to act as a sealed seam with regard to the filling space boundary once the seated seam has split open.

In the present case, a portion of a sealed seam 23 and/or 24 Is pieced on either side of the handle opening 13 towards the outer regions 21 and 22 along the filling space boundary 15, in order to seal the filling space In these intermediate regions.

In the region of the handle opening 13, said opening, it formed having a separation seam, can provide a corresponding closure in the sense of a filling space boundary, it is clear that a handle opening 13 produced ov punching pan he accompaniedbya sealed seam which Is continuous on the inside towards die filling space, which sealed seam has a iowerstrength but is also subject to less stress In a centra! region. in this embodiment of the bag, the separation seam 8 continues beyond the filling space 18 towards the bag opening as far as the end edge 8, However, as a result pieces of waste material fal between the separation seam 8 and the end edge 8 of the previously produced (open) bag, which pieces can be picked or suctioned off by common mechanical devices. Otherwise, for all intents and purposes, however, the bag 1 can be manufactured ina conventional manner and can aiso be füled In a conventional manner in packing machines.

The decisive advantage is the high seam resistance of the separation: seam 8 in the region of the filling space boundary 15, which, even with extremely reduced film thickness, still provides a bag which is robust for fling and for further transportation and handling,

Claims (6)

PATIENT INDIVIDUAL POINTS 1. A bag (1) of a weldable plastic film of a thin film thickness, in particular of less than 40 μηι, with at least one handle strip (12) connected to the filling space (16) surrounded by two layers of the plastic film, wherein the plastic foil is guided along the boundary of the filling space (15), extending as an outer edge into a double layer of a melting and separating separating seam (8) and comprising at least one handle opening (13), characterized in that the handle strip ( 12) an outer edge of the separator seam (8) in some areas on longitudinal sections (21, 22) which do not include a handle opening (13). at a distance of not more than 5 mm is guided by a weld seam forming the boundary of the filling space or by the limit of the filling space (15), A bag (1) according to claim 1, characterized in that the handle (12) has a handle opening (13) positioned approximately centrally and at both sides of the handle opening (13) at a boundary of the filling space. passing through a separating seam (8). A bag (1) according to claim 1 or claim 2, characterized in that the handle opening (13) is formed by a separating suture (8) at the boundary of the filling space (16) for the filling space (16). Halas. A bag (1) according to claim 3, characterized in that the handle opening (13) is in the form of a lobe with a seam (14) formed as an open ring 5. Bag (1) according to one of Claims 1 to 5, characterized in that the filling bar (18) is formed between the boundary of the filling space (15) and an opposite parallel border (7) and crosswise on one side of the filling opening of the plastic. with a protruding part of a foil layer. A bag (1) according to claim 5, characterized in that the protruding part is provided with small diameter holes (20) for filling as a handling edge. 7. A bag according to claim 5 or claim 6 (1). characterized in that the protruding portion has two layers (5, β edges) of different lengths of the plastic film