DE1510695B1 - Process for the production of a core yarn with potential elasticity - Google Patents

Description

1 2

The invention relates to a process for the production of core yarns that make it possible to produce elastic Development of a core yarn with potential elasticity to produce goods in which the elastic yarn compods Core one highly elastic and one temporary during processing in a normal going existing inelastic thread, which or unstretched or in a compressed after further processing into a fabric or 5 state and which after the knitted fabric is made ineffective, contains and by voltage of the temporarily existing inelastic at least one wrapping or sheath thread core thread increases in width, is held together. The inventive method offers the advantages

In the processing of elastic yarns part that different types of core yarns are produced often occur as a result of the high extensibility of the io. It depends on whether the Yarns when weaving or knitting difficulties elastic part of the core thread in the stretched or stretched on. Since the product is manufactured in a relaxed state, if the non-elastic state the frictional and mechanical tension often stabilizes the thread part, d. H. is shrunk. Is with are of different sizes, it is for example the elastic core thread when wrapping It is difficult to use elastic yarns, stretched too evenly, so the finished core yarn is left on crafted products to come. You had to go back the desired degree of elongation, whereby therefore find ways to transition the highly elastic threads in front of the non-elastic core thread into a corrugated limit in their elongation. stand passes. Subsequently, the core thread, an inherently elastic core thread, is shrunk in its elasticity according to the invention, whereby the corrugated did to limit by a tied-in auxiliary thread - 20 inelastic threads in the core together to a length, is for example by the German patent-shrunk, which entschrift the length of the elastic 1122 205 known, while according to the USA.- tensioned thread corresponds, so that the inelastic Patent specification 2397460 such a support thread after thread the composite yarn against further Fulfillment of its purpose by tearing destroyed, stretching in turn stabilized, and is thus rendered ineffective. At 25, the wrapping will be less or less at a Yarns like those in the Australian patent - no tension standing elastic core thread script 145068 and part of the German patent specification, the core yarn initially has 822 707 are described, an inelastic, which does not have a natural elastic tendency to shorten, Yarn temporarily stabilizing Fadenkompo- but if it is the treatment according to the invention nente is later dissolved out chemically 30 subjected, so the elastic thread decreases become, while by the British patent a corrugated state, but also that 736 954 a core yarn is known in which two core core yarn against elongation by the threads with such tension and with a stabilized state of the shortened inelastic be twisted around in such a way that a sta- core thread is protected.

bile yarn suitable for weaving or knitting. 35 The drawing shows an exemplary embodiment of the gives. In the German patent specification 648084 an object of the invention is shown. Show it Yarn described in which the inelastic core - each in a schematic representation thread is glued to the elastic. 1 shows the yarn produced according to the invention,

With the invention, the object is to be achieved in which the highly elastic thread part of the core To create a yarn in which the stretch of a 40 is in the stretched state and with a highly elastic The core thread is temporarily surrounded by a limited winding thread,

is that, in contrast to the mentioned state of FIG. 2, a core thread according to FIG.

the technology with simple means very precisely tensioned, highly elastic thread part of the core, can bilize. During the production of this yarn, FIG. 3 shows a core thread according to FIG

In particular, there should be no special feed swarf 45 Shrinkage of the inelastic thread part of the core, voltages and the associated mechanical engineering Fig. 4 the yarn according to the invention according to the

borrowed embodiments of the shrinking of the inelastic thread part of the core for the twisting process, used device. F i g. 5 the core yarn according to FIGS. 3 or 4

To solve this problem, according to the invention, after the removal of the inelastic thread part proceeded in such a way that the temporarily in front 50 of the core,

dene inelastic core thread after completion of the F i g. 6 to 10 the core yarn in other designs

Yarn and shrunk-out forms to stabilize it, in which a highly elastic, a becomes shrinkable, removable and inelastic only after further processing Woven or knitted fabric, preferably by means of a thread part, to form a jointly wrapped yarn Treatment with a solvent is removed. 55 are connected,

Advantageously, as a detachable thread, a Fig. 11, 12, 13 and 14 corresponding to the core yarn

Polyvinyl alcohol thread used. the embodiments according to FIGS. 1, 2, 3, 4

Under "highly elastic" threads are threads to be twisted and 5 in which the wrapping thread is subordinate to which is easily arranged in several 100% different ways. let expand and a relatively fast 60 In the F i g. 1 and 11 are each a high load following Going back after the elimination of the shear thread 10 shown as the core thread to which Exhibit load. A non-elastic thread 12 runs parallel under "inelastic" threads, which those threads are to be understood that do not consist of any or only shrinkable material. The two have a low extensibility and are made of a core thread 10 and 12 through the screw material exist, which is shrinkable and 65 shaped surrounding wrapping thread 14 together normal wear and tear when weaving or held.

Act or. Ä. A sufficiently high strength shows. In Fig. 11, the wrapping thread 14 is in loop

By using the inventively manufactured wound around the two core threads, in the manner and

3 4

Way, as it is inscribed in detail in the USA patent end threads a limited elasticity 3,078,654. point. In Fig. 6 are an elastic core thread 10,

The F i g. 2 and 12 show core yarns in which a shrinkable inelastic, temporarily front elastic core thread after stretching existing thread 12 and a permanent inelastic could relax and thereby the inelastic 5 core thread 18, the effect of which is best achieved by the Core thread 12 lays in waves 16. In this state designation can be expressed as a holding thread, the elastic core thread 10 can easily be as shown. The three-thread core is in the usual way the wrapped on the original, in Figs. 1 and 11, for the sake of clarity Length shown are drawn out, with the only one wrapping thread 14 for Darunelastic Core thread 12 is only brought into position as a "holding twine". If you leave the compound acts that the longitudinal expansion of the elastic yarn contract, as shown in F i g. 7 signed core f adens 10 is limited to the length value with which the net is, so both the temporarily available Threads 10 and 12 originally wrapped around the shortenable thread 12 as well as the inelasti-wound became. see thread 18 wavy. Then the unstretched

Figs. 3 and 13 show the yarns after the 15 core yarn for the purpose of shortening the thread F i g. 2 or 12 in a state that results, 12 treated accordingly, the yarn goes into one after the inelastic core thread 12 has shrunk to the state shown in FIG. 8 is shown in which has been. Instead of the wavy state of the normally existing ability to thread oneself out 12, as shown in FIGS. 2 and 12, the core thread 10 is thereby under-lit, a smooth design is now present, so that the shortened, non-elastic thread den, wherein the elastic and the inelastic core 12 has the same length. It is in this state thread 10 and 12 each essentially the same as the yarn according to FIG. 8, similar to the yarns according to FIG Have length and the core yarn as a result of the Fig. 3 and 11, stable shortening against elongation of the thread 12 against expansion so that it easily interweaves, forfeits or is secured. In this stabilized form the 25 can be knitted.

Core yarn is woven, knitted or otherwise after processing into a textile product

processed into textiles. In this processing, the yarn according to FIG. 8 subjected to treatment, According to the temporarily inelastic, the temporarily existing thread 12 ineffective properties occur the composite yarn makes practical, which either by tearing or eliminating any of the difficulties that can happen at the beginning 3 ° by loosening the thread 12, have been explained and which are normally included in FIG. 9 shows the yarn according to FIG. 7 after processing from elastic yarns to textile goods removal of the temporarily stabilizing thread available. After the yarns according to FIGS. 3 12, while in FIG. 10 the yarn according to FIG. 9 and 13 have been processed into a textile product, is shown under tension. The yarn the stabilizing effect of the core thread 12 35 according to the F i g. 5 and 14 can go up to elasticity Omission of what has happened, for example, as a result of the limit of the elastic thread 10 or so far can that the thread 12 is pulled out until the wrapping thread 14 a or the goods are stretched so far that the core has a limiting effect. The linear expansion thread 12 into innumerable, no longer in one another thread of the yarn according to FIG. 9, however, is on the urban bond standing fragments is torn. 40 initial length limited to that of the elastic

In the F i g. 5 and 14 are the yarns after the core thread 10 and the holding thread 18 with one another F i g. 3 and 13 had been connected after loosening the thread 12, since the retaining thread 18 a shown, the resulting yarn not allowing any stretch beyond this length because is capable of free expansion. it is not stretchable itself. Using a

In Fig. 4 a core yarn is shown, the 45 of which is such a core yarn in particular in the Her-core thread 10 advantageous when wrapping under a low position of goods that have little stretch or no tension at all. In this case, it should have the ability.

the shrinkage of the thread 12 has a shrinkage. The elastic core thread 10 can be made of natural

of the entire core yarn triggered, whereby the or synthetic rubber consist or a elastic thread in a compressed Zu- 5 ° multifilament polyurethane thread. The wrapping state has been transferred by threading 14 shafts 15 and the retaining thread 18 can be seen from. The yarn according to FIG. 4 is made in this way bigem yarn material that, however, through stabilizes and in this state cannot adversely affect the shrink treatment will be working. will.

If the shortenable thread 12 has a shrinkage 55 The shrinking, temporarily existing one learned by a third of its length, the core thread 12 must beelastische from such a material The thread is compressed accordingly, which is in one for the other threads of the was, it is possible to weave a product - with the core yarn being shrunk for example with a width of about 1 m - that can be. As a suitable material comes for this after the removal of the temporary forehands- 60 polyvinyl alcohol in question. This material should The width of the retaining thread is preferably shortened by an amount of up to 1.5 m expands. This is a very valuable property, 40 or 50% allow. Accordingly, it becomes a which in the production of stretch goods is not elastic core thread by 300% to four times its can easily be achieved. original length extended and with a

Figures 6 to 10 show core yarns that are not only brought together 65 polyvinyl alcohol threads against elongation during weaving or a subsequent 50 percent shortening of the Knitting can be stabilized, but the polyvinyl alcohol thread the core yarn in one go the removal of the temporary stabilization stand in which the elastic core thread

is extended by 100% or twice its original length.

The shrinkage of a temporarily present core thread made of polyvinyl alcohol can be achieved in a simple manner by the action of moisture. So was z. B. a 420 den. Polyurethane core thread stretched by 300%, combined with a 300 denier polyvinyl alcohol core thread and with two threads a 75 denier. 30-thread viscose yarn according to FIG. 11 combined. Was a sol ίο ches yarn at 20 ⁰ C is immersed in water, the shortening was tentatively; it took about 5 minutes; at 35 ⁰ C the reduction was complete in about 30 seconds, while at 50 ° C the reduction was carried out virtually instantaneously. In the case of polyvinyl alcohol threads, care must be taken that the yarn is not boiled in the water, since polyvinyl alcohol is easily soluble in boiling water. The effect of moisture at higher temperatures has the consequence that the temporarily present thread of polyvinyl alcohol gels without a solution occurring. This gelation makes it sticky, so that it glues the wrapping thread and the elastic core thread into an inelastic composite yarn. Care must be taken that the polyvinyl alcohol threads are shortened and sticky, but are not heated to such an extent that they come into a state of complete gelation and thus lose their strength.

Such gluing is particularly advantageous when the elastic thread has the tendency to exhibits spontaneous contraction, d. i.e. when it has been wrapped with considerable elongation was. If the elastic thread is only 100% or twice as high during the wrapping, unstretched length had been drawn out and it is desired to shorten the core yarn accordingly to stabilize the temporarily available, shortenable thread at an elongation of 50%, so can already the touch and the presence of the shortened, temporarily existing Core thread will be sufficient for the composite yarn in this low modulus Stabilize the area of the elongation curve without this with the wrapping and to be glued to the elastic thread.

Embodiment

A 420 den. Polyurethane core thread and a 300 denier. twelve-ply polyvinyl alcohol core thread are made with two threads of a 75 den. 30-thread viscose thread according to the USA patent 3 078 654 wrapped. During the wrapping, the polyurethane core thread was stretched by 300 ° / ». After wrapping, the core yarn was allowed to contract freely.

The unstretched core yarn was then stretched again 200% and during its treatment with Water held at 60 ° C in this stretched state. It was then immediately activated by means of a dried with low pressure steam heated drying drum. The resulting product was a stable, inelastic yarn that contained a polyurethane core thread, which at an expansion of 200% of the wrapped length had been stabilized.

The experiment was repeated, gradually lowering the tensile stresses being applied, see above that the core yarn was stabilized at elongations of 150%, 100% and 50%. In any case it resulted a stable, inelastic yarn.

Samples of the aforementioned game were boiled in water for a short time, causing the polyvinyl alcohol threads was dissolved and an elastic yarn resulted which had an elongation of up to over 500% the unstretched length allowed. The final elongation of the yarn was equivalent to that The above embodiment is larger than that of a similar yarn that does not have a temporary one Core thread had been wrapped; This stems from the fact that the space occupied by the temporary existing thread was ingested becomes free; so that the wrapping thread lies looser around the elastomeric core thread, so that only a minor braking effect on the Stretching of the yarn is exerted.

Claims (3)

Patent claims: 1. Process for the production of a core yarn with potential elasticity, the core of which has a highly elastic and a temporarily existing inelastic thread, which after the Further processing into a woven or knitted fabric is rendered ineffective, contains and by at least one wrapping or sheath thread is held together, characterized in that that the temporarily existing inelastic core thread (12) after completion of the yarn and is shrunk to stabilize it. 2. The method according to claim 1, characterized in that as temporarily present inelastic thread a thread that can be removed by solvent treatment is used. 3. The method according to claim 2, characterized in that the temporarily existing inelastic core thread consists of polyvinyl alcohol threads. 1 sheet of drawings