Resealable Sack or bag

Abstract

A sack or bag is made of a collapsed, thermoplastic tubular film segment, which is provided preferably with side folds, by affixing head and foot welds and is provided on at least its head side with corner-partitioning corner welds. In order to be able to reseal such a sack after a partial quantity has been removed from its filling, the corners are provided in such a manner with cutouts, starting from the face-sided cutting edge, that the results are side strips, whose outer ends are provided with redetachable connecting means and that are designed so long that they can be folded in the outward direction by folding diagonally over the side edges of the sack or bag. After formation of a sack-sealing roll, the connecting means can be connected together for the purpose of fixing the roll in position.

Description

[0001] The invention relates to a resealable sack or bag, which is made of a collapsed, thermoplastic tubular film segment, which is provided preferably with side folds, by affixing head and foot welds and is provided on at least its head side with corner-partitioning corner welds.

[0002] Such sacks or bags exist; and hence there is no need to describe them in detail. If the sacks or bags have been made from tubular segments provided with side folds, they assume an essentially square shape after they have been filled. Such sacks or bags are often used to package and store bulk materials, of which only a partial quantity is removed after the sack has been opened so that there is the problem of resealing the sacks or bags until the next partial quantity is removed.

[0003] Therefore, the object of the invention is to provide a sack or bag of the class described in the introductory part that is economical to produce and can be resealed in an easy to handle manner once the bag or sack has been opened.

[0004] The invention solves this problem in that the corners are provided in such a manner with cutouts, starting from the face-sided cutting edge, that the results are side strips, which form preferably handle straps and whose outer ends are provided with redetachable connecting means and that are designed so long that they can be folded in the outward direction by folding diagonally beyond the side edges of the sack or bag.

[0005] Sacks or bags of the class described in the introductory part are usually opened by severing the head weld, sealing the sack, with a cut parallel to said head weld. If a partial quantity is removed from such an opened sack or bag, the side walls and optionally the side folds of the bag can be laid flat until said bag is filled and then closed by rolling up. After forming this roll, however, it must be fixed in position in order to prevent it from an undesired unrolling, a feature that is usually solved with adhesive strips or clamps. In the case of the sack or bag, according to the invention, the rolled up opening side can be bent or curled around the central axis of the sack or bag so that the strips, which are provided with the redetachable connecting means and which project laterally beyond the rolled up opening side of the bag, can be connected together so that the roll, sealing the bag, is fixed in position.

[0006] Expediently the redetachable connecting means comprise Velcro fasteners, permanently tacky remaining layers, snap fasteners or strings.

[0007] If permanently tacky remaining layers are provided, they are preferably covered with peelable layers up until the time they are first connected together.

[0008] If the connecting means comprise strings, the strips, connected to them, do not have to project beyond the roll, sealing the sack, because a seal can be achieved by merely knotting the strings. If the seal is accomplished with the use of strings, they do not have to be connected to the strips, but rather it suffices to connect them to one side of the sack or bag.

[0009] One embodiment of the invention is explained in detail below with reference to the drawings.

[0010] FIG. 1 depicts the opening side of a side fold sack of the invention in the collapsed state.

[0011] FIG. 2 depicts the sack, according to FIG. 1, after it has been opened, and schematically indicated fill states and outwardly folded strips, serving to fix into position the roll, sealing the sack; and

[0012] FIG. 3 is a side view of the sack, according to FIGS. 1 and 2, after removal of a partial quantity of its filling in the resealed state.

[0013] The resealable side fold sack, depicted in the drawings, is made of a thermoplastic tubular film segment, which is provided with side folds, and which is provided (in a manner that is not illustrated in detail) with a bottom and on the head side with corner-partitioning corner welds 2, which run at a 45° angle relative to the side edges 3 and seize only one of the two side folds, and hence are not connected together. The corner welds 2 terminate in front of the inside folding edges 4 of the side folds. They run at approximately right angles into the upper cutting edges 5 of the tubular segments so that it is guaranteed that the sack-sealing head welds 6 cross the corner welds in the illustrated manner. The head welds 6 are also designed continuous through the corners, partitioned off by the corner welds 2. The corners, provided with the head welds 6, are provided in the illustrated manner with cutouts 7, which separate the peripheral strips 8, which extend freely from the corners.

[0014] These peripheral strips 8 can be used as handle straps, since they are connected together on the head side and can be grasped from the side.

[0015] In the region of their upper ends the peripheral strips 8 are connected to strips 9, made of Velcro fasteners.

[0016] FIG. 2 depicts the sack, according to FIG. 1, in various fill states, and for the sake of a better overview in the collapsed state, even though the sack assumes, of course, a different, namely square shape in its filled state. To open said sack, the upper part, provided with the sealing weld 6, is severed from the sack in the manner, apparent from FIG. 2. After the sack has been opened, the sack exhibits an upper fill state 11. After a partial quantity of the material 10 has been removed, the fill state in the sack drops to the level 12. The upper sack end that has become free thereby can now be rolled up in the conventional manner for the purpose of sealing. Prior to rolling up, the strips, bearing the Velcro fasteners 9, are folded in the outward direction at an angle of about 45° so that the Velcro fastener strips project beyond the outer edges of the sack 3. If the sack seal is formed by rolling up the sack end, the sack-sealing roll 13 can be united in the shape of a ring by curling or bending around the central axis of the sack in such a manner that the Velcro fasteners 9 can be attached to each other in order to secure the rolling up that seals the sack.

Claims

1. Resealable sack or bag, which is made of a collapsed, thermoplastic tubular film segment, which is provided preferably with side folds, is provided with corner-partitioning corner welds (2) by affixing head and foot welds (6),

characterized in

that the corners are provided in such a manner with cutouts, starting from the face-sided cutting edge (5), that the results are side strips (8), which form preferably handle straps and whose outer ends are provided with redetachable connecting means and that are designed so long that they can be folded in the outward direction by folding diagonally beyond the side edges (3) of the sack or bag (1).

2. Sack or bag, as claimed in

claim 1, characterized in that the redetachable connecting means comprise Velcro fasteners (9), permanently tacky remaining layers, snap fasteners or strings.