DE1076307B - Process for the production of highly elastic knitted and knitted goods - Google Patents

Description

Process for the production of highly elastic knitted and knitted goods There are a number of methods of making highly elastic knitted and woven fabrics Knitwear made from synthetic threads became known.

One of the known methods is used in the following way: First, a yarn made of synthetic high polymers, e.g. B. polyamides very high right-hand twist of about 2000 turns per meter, then the yarn in subjected to a heat setting on a firm base, which may be necessary can be made in the presence of swelling agents, and finally the applied twist turned back above the zero point. In the same way, a The thread is twisted to the left, subjected to the same procedure, and finally becomes a thread with a right-hand twist twisted together with a thread with a left-hand twist. Through this the result is a highly elastic, strongly crimped yarn. It can then be known in Processed into highly elastic articles according to the knitting or knitting process will.

Another method is to give a yarn a false twist at least 2000 revolutions per meter and the twist in the same operation taken out again, the yarn undergoing a thermal treatment when it is turned up exposed to dry heat or steam. Then, in turn, yarns are used Twisted together in different directions of rotation and processed into knitted or knitted goods.

This process has also been applied to the production of knitted and knitted goods from monofilament yarns. The monofilaments are turned up to 2,000 to 3,000 turns per meter in a right and left twist, washed out, fixed and partially turned back again or beyond the zero point. These monofilament threads are mainly processed into stockings, whereby a few rows of stitches are knitted with the yarn with a left-hand twist and an equal number of stitches with the yarn with a right-hand twist. This is how you get an elastic stocking.

These procedures are very time consuming, cumbersome and as a result of high fusing temperatures often reduce the strength of the material. With monofilament Yarn is the high twist, followed by fixation and one of the first twist reverse rotation, disadvantageous, since the monofilament thread causes a torsion learns which damages the thread considerably.

Furthermore, there are also processes for the production of such knitted goods made of synthetic threads, such as polyamide threads, which are known to be opposite to normal Hosiery goods have a somewhat increased elasticity. Used to make them you twisted threads made of polyamides, which fix, but then not twisted back are. Here, too, threads with a right and left twist are alternately forfeited. If you want to use this method for. B. make a stocking for a certain size, so it is necessary to work it with more courses than a corresponding one, Stocking made by customary methods. The individual stitches are because of the The threads are twisted more tightly. However, the elasticity of the stocking is not so great, that one would get by with the normal number of courses.

It has now been found that highly elastic knitwear and knitwear can be produced from partly left-handed and partly right-handed synthetic thread bundles or individual threads, if shrinkable, non-fixed threads with at least 600 turns / meter are turned to the left or to the right, alternately in each case small number of rows of stitches forfeited or knitted and then the knitted or knitted fabric thermally shrinks in a manner known per se.

The twisted threads preferably have a twist of 600 to 3000 turns per meter. However, threads with a higher twist can also be used. The threads are made with a right and left twist.

All linear high-polymers are used as synthetic fibers Question, especially polyamides and polyesters.

To z. B. to get an elastic stocking, the yarn is in as is known, alternately with right and left twist during the entire knitting process alternately forfeited in a small number of courses, something like this, that over a thread guide two rows of stitches with your with right twist provided thread and then two rows of stitches with the one provided with left twist Thread are knitted. If the finished stocking has been subjected to normal treatment will, like washing, dyeing and shaping, it is turned by the shrinkage of the Thread that has never undergone heat treatment. was, excellently elastic.

A stocking produced in this way can be stretched in the longitudinal direction by about 50 to 100 11 / o and, due to its elastic behavior, hugs the leg well.

# The method according to the invention can not only be used in cotton knitting, but also in the same way in the production of circular and circular knitted goods use.

Since the yarn must not be subjected to any shrinkage process, either by washing or heat setting, before processing, it is advisable to use yarns that have a low content of monomeric components when using yarns made from polymerized caprolactam exhibit. The content of monomeric constituents is expediently below 2.5 %. Such yarns with a low content of washable parts do not lead to any processing difficulties and give the finished product particularly good properties.

In addition to the polymer made from caprolactam, other linear ones can also be used Polyamides, such as condensation products of hexamethylenediamine and adipic acid, as well Process polymers of ome-a-amino-undecanoic acid according to the method described.

Also yarns made from polyesters, such as those made from terephthalic acid and ethylene glycol, and from polyurethanes, such as those from Hexandiisocya: iiat and butanediol are obtainable can be used for the process according to the invention.

The production of elastic knitted goods through alternating processing of twisted threads with links or. Right-hand twist is also already out of the field of Natural fibers - known.- In contrast to the synthetic fibers, however, the Natural fibers completely different properties. Threads made from natural fibers have none the drawn synthetic threads and provide the corresponding shrinkability in the upturned state without heat setting and reverse twisting, a yarn that immediately can be processed into elastic knitted fabrics. The elasticity of the knitted fabric is based directly on the opposite twist of the alternately knitted threads in the knitted fabric.

Example A hidden thread of titer, 15den. from caprolactam palyamide, which has a content of 1.8 % monomeric caprolactam and a shrinkage of 12 0/9 , is twisted on a conventional twisting machine to 1200 Z-twists per meter and wound on a bobbin in a cross-lay. A second thread is made in the same way with 1200 S-twists. The two yarns twisted in opposite directions can then be processed into knitted and knitted goods using known methods.

The high elasticity of the goods is only created by a thermal one Shrinkage, such as when the goods are finished with post-treatment in the heat or by dyeing.

Claims (1)

PATENT APPLICATION: Process for the production of highly elastic knitted and knitted goods from partly left-handed and partly right-handed synthetic thread bundles or single threads, characterized in that shrinkable, non.: Fixed threads with at least 600 turns per meter left and right twist alternately in a small number of rows of stitches in each case forfeited or knitted and then the knitted or knitwear is thermally shrunk. Considered publications: German Patent Specifications No. 633 376, 661538; Swiss Patent No. 282 322; Austrian Patent No. 180 243; USA.-1 # Patent Publication No. 2,102,730 ; H. Hopff, A. Müller, F. Wenger, "Die Polyamide", 1954, pp. 304 and 305, - - "Textile Warld", July / 1952, pp. 95 and 238; "Melliand Textile Reports", No. 4/1955, p. 394.