DE1435550A1 - Process and device for the production of crimped, highly elastic, fully synthetic threads - Google Patents

Description

Method and device for manufacturing
crimped, highly elastic, fully synthetic threads ». , ■

It is known to be highly curled fully synthetic
To manufacture threads, so-called crimped yarns, using the false twist process, in which a thread is given a false twist, which is heat set before it is untwisted. The highly crimped, fully synthetic threads produced in this way have a noticeable de-crimp elongation, which is nevertheless not as great as that which can be obtained by the older discontinuous process in which the threads are twisted in successive separate operations
Coils are fixed and untwisted

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For "certain applications, it is not only the magnitude of this de-crimping stretch that is important, but also the speed with which the thread" returns to the crimped state when the tension is released (snap). This speed "for returning to the curled condition plays an important role" in from such threads textile products manufactured as tight-fitting clothes, bathing suits Od ₀ like. " For this reason, the customary crimped yarns obtained by the discontinuous process are still used to a very large extent for the production of such goods. .

Ent:

According to the invention, the curvature expansion or β

Speed of return to the curled state of crimped, highly elastic, fully synthetic threads in the false twist process through a simple measure can be significantly improved, namely by directly behind the false twister with a heated solid body and in front the heating device moistening the thread.

The moistening can be effected with warm or cold water, which optionally contains a wetting agent and / or a May contain softening agents in solution or in dispersion « Moistening can also be done by oiling *

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«· 3 -

Moistening or oiling the thread or thread bundle facilitates the formation of the false twist and evens it Thread manufacturer) are glued together by softening and _{loosening the residues that have formed o} This improves the uniformity of the color affinity and reconditioning the thread. The most important result, however, is an increase in the de-curl elongation by $ 10-20. The, velocity of the Z _u recirculating in d s curled condition, which is quite difficult to detect numerically, but clearly shows in the finished Yfare is improved also considerably

The moistening can be done by bringing the thread into contact with a partially immersed roller or with a sponge, with a capillary tube or any other equivalent means can be effected.

The invention is explained in more detail below with reference to the drawing, for example

In the embodiment of a device according to the invention shown schematically in the drawing

a thread I (thread bundle) running off a bobbin 2 held under low tension by means of a tensioning device 3 and pulled off by a pair of rollers 4. The string. then runs through a heating device hinduoh, in which he by contact with a preferably uniform curved surface of a heated solid body * 5 is heated »

Hach the exit from the heating device, the yarn 1 comes with a roller 6 in contact., Non-swelling on the circumferential surface of a suitable _f liquid is optionally applied by contact with another RgIIe that eintaucht.- partially into a bath of the Anfsußhtungsflüssigkeit occurs Immediately thereafter the moistened thread into a false twist generator 7 e ± n _f which gives the thread a false twist _r which runs back into the heating device and is fixed at its exit.

Behind the false twister 7 is the thread <Suroh a Roller pair 8 withdrawn, the speed of rotation in a ' appropriate ratio to the speed of rotation of the rollers stands in order to bring about the usually desired low shrinkage of the thread between the roller pairs 8 and 4. Of the Fixed thread turns in the running direction, behind the false twister 7 again.

The pair of rollers 8 gives the thread to a winding bobbin from, which is rotated by a driven roller IO, wherein a to-and-fro thread guide 11 creates a lap with the desired thread crossing «The speed, with which the thread is wound onto the bobbin 9- can be determined with reference to the speed of rotation of the pair of rollers S can be adjusted so that a certain additional Shrinkage of the thread is allowed.

A second heat treatment can take place in a known manner between the pair of rollers 8 and the thread guide 11

It is to be observed that the threads to be crimped both Be monofilament as well as, in particular, aue thread bundles which have a customary number of individual threads can·

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Claims (2)

Claims 1. / Method of making curled, more highly elastic Fully synthetic threads, such as polyamide threads, in which the thread is given a false twist, after heating through contact with a, the false twister upstream, heated solid body is fixed ", characterized in that the with the false twist provided thread between the exit of the heated body and the false twister with a not swelling liquid is moistened. ./ " 2. The method according to claim 1, characterized in that the moistening with warm or cold water, the a wetting agent and / or an ayi vaging agent in solution or in dispersion, may contain, or takes place with an oil. 3 ». Device for carrying out the method according to claim 1 or 2, characterized in that a device (6) for moistening the thread is arranged between the heated solid body (5) and the false twist generator (7). 9808/0398