IL45700A - Gab formed of two-layer raschel fabric - Google Patents

Description

A BAG- FORMED OF TWO-LAYER RASCHEL FABRIC i The invention concerns a bag made from double surface (double layer) aschel fabric, both walls of which, formed from warp thread and weft yarn, are joined to each other in the area of the side borders and at the. base of the bag by means of a textile bond.

It is possible to manufacture a finished bag of the above mentioned type on a Raschel-machine , also known as a warp knitting frame, the two bag-walls of which do not have to be joined to each other by sewing, either at the side-borders or at the base. Furthermore, it should also be mentioned that the warp threads are frequently referred to as chain or pillar stitches and that a weft yarn which zig-zags back and forth between two warp threads is also termed weft inlay.

Bags for produce such as vegetables, fruit and the like are generally woven or knitted relatively loosely, so that the walls of the bag possess openings of considerable size between the threads. If a label is now : . attached to a wall of the bag , the case of woven bags having walls manufactured in separate runs it is admittedly possible to prevent two bag-walls from sticking together at the places where glueing or welding has been effected, by attaching the labels before the bag-walls are sewn together, but it is hpwever unavoidable that the produce with which the bag is later filled should, due to these openings, come into contact with the adhesive used for attaching the label or that the netting should be so severely weakened. where welding has taken place that in sub- sequent use the wall of the bag should tear at those / points. ^hese disadvantages also of course occur in the case of finished bags of open composition manufactured on the Raschel-machine where furthermore a plate or something similar must be inserted between the walls of the bag before a label is glued or welded to a bag-wall ,.· in order to avoid the two walls of the bag. becoming glued or welded to one another. Finally, it can occur both in the case of, woven bags and bags manu- factured on. the Raschel-machine, that during their subsequent storage the walls of the bag become stuck together with the adhesive used for attaching the labels In addition, the labels do not adhere particularly well due to the open structure of th walls of the bag.

The invention was based on the requirement that, in the case of bags finish-manufactured on a Raschel-machine or warp knitting frame, the attachment of advertising material., details of contents etc. should be made easier. For this purpose it is suggested, according to • '. . t ' . ' ' the invention, that at least one tape should be inserted in one wall of the bag, the width of which h ul t h m 1 i t c etween ' . v ' ■ ί,. these warp threads. A tape of this type, also known · as a filler tape, gives a good, firm foundation for the welding or glueing procedure; it is—al6o £oasiblo to uti-liao tho tape itself ao a label; oo that a ■eoparato labol dooc no havo—to bo affixed to the wall of tho bag- If a label is to be welded to the wall of the .bag, the inserted tape also leads to the advantage' thai: undue weakening of the wall of the bag at the points where welding has taken place is certain not to. occur. '· I The invention is especially suitable for use on bags the warp threads and weft yarns of which are of foil tape.

In this connexion it is to be recommended that the tape^ be manufactured from a foil made of thermoplastic syntheticImaterial , and especially when a label is to be welded to it. It is of course also possible to use paper, a woven tape or metal foil.

If a tape is retained merely by a single weft yarn which runs back and forth between two warp threads, the tape must run alternatively in front of and behind this weft yarn. The manufacture is simpler if in the area of the tape several weft inlays are provided, i.e. if ·'. several weft inlays or weft yarns extend between the warp threads on both sides of the tape, between which the tape is held. Thereby one weft inlay at the front, and one weft inlay ' retained between two weft yarns which run to and fro between the warp threads. This concentration of material in the vicinity of the inserted tape increases the degree of safety still further when welding on labels .' Several tapes can of course be inserted in the wall of a bag neighbouring each other or at intervals from one another. · For attaching labels it is to be recommended that several tapes should be inserted in the wall of the bag at intervals from one another and that a label, be attached to these, or particularly that it be glued ■ or welded to them. ' i .

In order to avoid having to apply an additional layer of adhesiye later, tapes can be used which are coated on one side with an adhesive, or. more particularly with an adhesive which can be activated or one which can be sealed on the application of heat.

Because a label which is attached to tapes which run at right angles to the length of the bag forms a pocket which is open at the side, the label can in some cases become damaged during transport of the bag etc. Tapes can therefore also be (inserted in the wall of the bag between the upper and lower edge of the label and the label can be fastened to these additional tapes too the welded joints which cross the middle portion of the · label can however in certain circumstances interfere with the wording or illustration on the label. In order, to overcome these problems, it is therefore suggested that a label be employed which extends to the area of the side edges of the walls of the bag which are joined together there and that the label be attached up from twice as many warp threads and weft yarns as compared with the single wall of the bag, the danger . does not occur when welding, of causing unacceptable weakening. Furthermore, because the produce which the bag will contain cannot reach the areas in the i t vicinity of the edges, there are also no grounds for objection to the glueing on of labels in these areas. j Further characteristics, details and advantages of the i invention ,can be ascertained from the enclosed drawings and the description which follows of two examples of types of bags designed in accordance with the invention; these are as follows: Fig. 1 a view of a bag manufactured on a Raschel- , machine with a filler tape inserted in one wall of the bag; Fig. 2 a view of a bag manufactured on a Raschel- machine with a label fastened to one wall of the bag ; Fig. 3 section A from Fig. 1 in a larger scale; Fig. 4 a cross-section following the line 4-4 in Fig . 3; Fig. 5 section B from Fig. 2 in a larger scale and with the label partially lifted away from the wall of the bag; . g. t e on ng etween warp threads an we t I yarns in the wall of ' a bag made of Raschel- fabric V' Fig. 7 the bonding of the wall of the bag in an area in which a filler tape (not shown in illustration) can be inserted.

The bag shown in Fig. 1 and referred to in its entirety as 10 possesses two side-borders 12 as well as ΐ » ■ a bajse 14 It is known that such, a bag can be finish ■· i manujfactu,red on a Raschel-machine or warp weaving frame from foil tape in such a way that both walls of the bag in the area of the side borders 12 and the base 14 are joined to each other by means of a textile bond -between warp threads and weft yarns, so that no subsequent sewing procedure is required. , The bag - o n in Fig.—1 has a fillor-tapo 16 ineortod .·■' ■in ■ the uppermost bag-wall-^—which will itoolf carr ah inscription » In the case of the bag shown in Fig . 2 and referred to in its entirety as 18, which is also meant to depict a bag made from Raschel-fabric using foil tape, two filler-tapes are inserted at ■ intervals from one another; in the uppermost bag-wall, under the upper border 20a and the lower border 20b of which a label 20 is positioned. Filler-tape and label 20 are made from a , thermoplastic synthetic material, so that they can be joined to one another, and to the foil tape of the bag made on the Raschel-machine, by means of welding. , manufactured on the Raschel-machine and in an area in which a filler tape has not been inserted. In conformity with Fig. 3 the warp threads have again been numbered 22 and the weft yarns numbered 24. On the other hand though, Fig. 7 shows the two weft inlays 24a and 24b together with the two warp threads 22a and 22b ' between which the two weft yarns run back and forth." The filler- tape retained between the weft yarns 24a and ! ' ' , . ; 24b has however been omitted from Fig; 7.

The filler tapes are of course not inserted between the weft yarns subsequently, but. the technical possibilities of the Raschel-machine enable the insertion or weaving · in of the filler tapes at the time the bag is first manufactured.

Claims (4)

1. 45700/3 WHAT WE CLAIM IS:- 1. A bag formed of a two-layer Raschel fabric, the two walls of which, both made up of warp threads and weft yarns, are joined to one another in the region of the lateral borders and of the bottom of the bag by means of a textile bond, characterized in that, in a manner as such known, several tapes are inserted in at least one wall of the bag, the width of which tapes is at most equal to the warp interval (distance between two adjacent warp threads) and each of which is situated between two adjacent warp threads and retained by at least one weft yarn running between these warp threads, that these tapes are situated at a distance from each other, and that a label is fastened to these tapes, or more particularly, is glued or welded to them.

2. The bag. as claimed in claim 1, characterized in that the tapes consist of a thermoplastic synthetic foil.

3. The bag as claimed in claim 1, characterized in that the tapes are coated with an adhesive, especially with an \ actiyatable or heat-sealable adhesive.

4. The bag as claimed in claim 1, characterized in that the label reaches as far as the region of the lateral borders of the bag walls which are joined together at these points and which are attached to these regions by welded or glued joints running parallel to the borders.