DE1291849B - Process for the production of a tape which consists of a multiplicity of parallel threads held together by a layer of plastic or the like - Google Patents

Description

The invention relates to a method for producing a tape, which consists of a multitude of parallel, mutually touching threads that are held together by a layer of plastic or the like surrounding them, which is consolidated by fibers extending in the transverse direction of the belt.

In a known method such one in transverse direction by means of a layer of staple fibers has od the solidification of the layer of plastic. Like. Made which is brought together with the filaments prior to the application of the plastic. This procedure is complex. Furthermore, the fibers only improve the cohesion of the threads through solidification of the plastic, but not the cohesion of the threads and the plastic layer.

According to the invention, these disadvantages are avoided in that threads are produced with protruding from their surface fibers that a Thread made of endless single threads guided over or with grinding or cutting surfaces blown on a sharp air stream or od between two pairs of rollers. The like. Passed through and is stretched, so that part of the individual threads tear, and the threads then in parallel layer through a viscose, rubber, acrylic acid resin, polyvinyl acetate bath Od. Like. And then passed through a pair of pressure rollers, so that one by correspondingly long fibers protruding from the surface of the threads in the transverse direction The solidified plastic layer of the tape is formed.

The process is not very complex, since the threads themselves already have the fibers used to strengthen the layer of plastic or the like. By connecting the fibers to the threads, good cohesion between the threads and the plastic or the like is also achieved. Due to its internal structure, the tape produced according to the invention has deformability and strength properties which make it appear particularly suitable as a replacement for metal tapes in the packaging industry when processed with a correspondingly high tensile strength material. For Reifencordlagen it is already after USA. Patent 2,053,123 known on or to use multiple twisted yarns, short between the filaments, additionally introduced staple fibers are sandwiched are either dispersed in the precipitation bath for the thread production and is adjoined by The threads forming there adhere, or the threads formed are passed through a chamber in which staple fibers float in the air and attach themselves to the threads and then protrude more or less from their surfaces. Apart from the fact that additional fibers have to be introduced into the threads, which requires special equipment, these fibers do not, as can be achieved with the method according to the invention, represent a direct continuation in the form of protruding ends or loops of the individual fibers forming the thread, which directly form continuous parts of the thread in their continuation and, on the other hand, intervene in the covering layer to reinforce and bind it.

Similarly, U.S. Patent 2,428,654 for Manufacture of fiber-reinforced plastic structures, textile threads with staple fibers occupied by the fibers are bound in a synthetic resin coating of the threads. Here, too, the first step is the preparation, application and binding of the staple fibers required, whose desired anchoring effect differs significantly from the flawless one Connection with the actual thread depends.

In both cases, the threads are anchored in the plastic or the like. So not through its own thread parts, but to a certain extent only through additionally introduced Intermediate anchor.

The subject of British patent specification 664 100 is a non-woven fabric made from rovings, the fibers of which are made adhesive by the action of heat or solvents. The rovings with the fibers made adhesive are connected to one another by calendering or the like. This is not about the connection of threads with an enveloping plastic layer, but about the mutual connection of fibers of different roving yarns. The end product has little tensile strength compared to the tape produced according to the invention. In this case, too, the di ' e. - Connection of 4 neighboring roving-producing fibers is not firmly anchored in the pre-ying, especially since roving does not consist of endless single threads.

In the following, exemplary embodiments of the tape produced by the method according to the invention are explained in more detail with reference to the drawing. In this FIG. 1 shows a plan view of a strip section produced according to the invention, FIG . 2 shows a perspective view of two threads of the band section connected to one another by a plastic layer on an enlarged scale, FIG . 3 one of the F i g. 2 similar view of two threads connected to one another, but one that differs from that of the threads shown in FIG . 2 have different properties, and FIG. 4 shows a perspective view of a strip section produced according to the invention.

To carry out the method according to the invention, first Threads, which consist of endless single threads, in threads with from their surface outstanding fibers converted. It does this in a number of ways.

In this way, the threads consisting of endless single threads can be connected to a raulie or area occupied by a cutting edge, with single threads cut at the surface of the threads. It can use a grindstone Find. The threads are then fed to a winding or twisting device.

It is also possible to use a device in which the threads a predetermined stretching between pairs of rollers arranged at a distance from one another are subjected, so that some of the endless single filaments are broken, wherein the torn threads pop out of the surface of the threads. Through appropriate Controlling the stretching, threads are achieved, which predominantly consist of endless single threads and only partly consist of torn individual threads.

It is also possible to loosen the threads from endless single threads To guide them without tension and at the same time to expose them to a current of air Part of the individual threads lying loosely on the surface from the thread forming Association of the single threads blows out in sections, which results in the Thread surface: form protruding fiber loops.

A plurality of such threads is then od from a roll. deducted. The threads are drawn through a bath in a parallel position, the film-forming bath Contains plastic. Then the threads run between pressure rollers, whereby the excess plastic is pushed out and out of the thread surface protruding fibers are pressed flat. The latter are so long that they are there come to rest over the neighboring thread. You thereby solidify the resulting Plastic layer in the transverse direction of the tape and set to form the plastic layer required amount of plastic.

The threads used can be twisted or untwisted. It can be natural silk, rayon, acetate silk or triacetate silk threads. Threads made from polyamides, polyesters, olefins, acrylic acid and modacrylic acid (a synthetic thread in which the thread-forming substance is any long-chain synthetic polymer which consists of less than 95 percent by weight, but at least 35 percent by weight of acrylonitrile units) can also be processed. Likewise, threads made of polyvinyl acetate and synthetic threads, in which the thread-forming substance is any long-chain synthetic polyamide, which has recurring amide groups as an integral component of the polymeric chain, and glass threads made of endless individual threads.

As a film-forming plastic binder to hold the threads together can viscous, water-soluble and alkali-soluble cellulose ethers, in organic Solvent-soluble cellulose ethers and esters as well as natural and synthetic Gums and resins, glue, gelatine, casein, as well as film-forming fully synthetic plastics, such as vinyl plastics, nylon, polyester or acrylic acid can be used. Plastic or the like should not be sticky, in the dry state, but tough and flexible. The plastic od. The like. Plasticizers, plasticizers, dyes and Contain pigments that take into account the chemical structure of the plastic or the like. Are selected. Among the fully synthetic plastics are polyvinyl alcohol, Polyvinyl acetate, polyvinyl butyral and acrylic acid resin solutions are preferred.

In FIG. 1 shows a belt 10 produced according to the invention, which contains five threads, which predominantly consist of endless individual threads. The threads lie parallel and are connected by film-forming plastic. Threads protruding from the surface of the threads extend over the neighboring threads, thus forming a fiber layer that extends over the entire bandwidth and strengthens the layer.

The F i g. 2 shows a greatly enlarged scale two adjacent filaments of the present invention hergeb C) set band. Here, each thread is in turn composed of two threads 11 and 12, which consist almost entirely of endless and practically parallel monofilaments 13 which are twisted with one another. Each thread 11, 12 has individual threads forming a small percentage of protruding fibers 14 at least on its surface. The layer 15 made of plastic or the like is shown greatly exaggerated in terms of its thickness in the drawing. The fibers 14 extend in the transverse direction of the belt over the respective neighboring thread 11, 12 and are either completely or partially embedded in the plastic layer, which is achieved by the fact that the belt passes between the already mentioned pressure rollers when it leaves the binder bath. The embedded fibers 14 are shown in FIG. 2 shown by dashed lines. They reinforce the plastic and give the tape additional transverse strength, while at the same time an improved connection of the plastic or the like with the threads is achieved.

In the case of the in FIG. 3 shown embodiment of a tape produced according to the invention, each of the threads 17, 18 has practically parallel endless individual threads that partially form fiber loops 22 on the surface of the threads, which extend to the side and in each case up to the surface of the neighboring thread. These loops are also at least partially embedded in the layer 23 made of plastic or the like.

F i g. 4 shows a band made from five threads 27, 28 , the threads of which consist of endless individual threads. The protruding fibers 29 are in turn part of the threads 27, 28 and each extend over the neighboring threads 27, 28. As in the embodiments already described above, the fibers 29 are embedded in the plastic layer 30 and also serve to support the tape in the transverse direction to solidify.

Tapes produced according to the invention can be used as a replacement for metal tapes in the packaging industry. They have the following advantageous properties compared to metal straps: a) sufficient flexibility so that they are well suited for lacing, b) sufficient stiffness so that they can be guided under a bale and through a slot in an automatic packaging machine, c) good strength in the transverse direction, so that the individual threads do not separate from one another during handling, packaging and transport of the tied goods, d) a light weight with high tensile strength and e) a certain surface roughness so that they do not consist of a metal fastener slide out.

Claims (1)

Claim: Process for the production of a tape, which is made of a multiplicity of parallel, mutually touching threads, which through a them surrounding layer of plastic od. dg]. are held together, which by fibers extending in the transverse direction of the tape are consolidated, characterized in that that threads with fibers protruding from their surface are produced by that a thread made of endless single threads over grinding or cutting surfaces or blown with a sharp stream of air or passed between two pairs of rollers and is stretched, so that part of the individual threads tear, and the threads then in parallel position through a viscose, Guinmi, acrylic acid resin, polyvinyl acetate bath Od. Like. And then passed through a pair of pressure rollers, so that one by correspondingly long fibers protruding from the surface of the threads in the transverse direction The solidified plastic layer of the tape is formed.