DE2062636A1 - Process for twisting yarns - Google Patents

Description

Priority: 22.12.1969 - Great Britain

The invention beisieht to the twisting of flat yarns 1st from yarns of high titer zusammensetzenJ By the term "flat" yarn, a yarn-rated one, which has practically no twist,

The invention is particularly suitable for facilitating the Applying a twist to yarns that consist of synthetic monofilaments, each monofilament having a denier im Range from 100 den to 1500 den

The twisting of such yarns is usually done on one conventional ring-and-traveler twisting machine, with the yarn withdrawn from a supply wiokel, by a squeeze roller zuftihrsycjtena and is twisted through the Bing-and-Runner system while it is being wound up. It has agrees that the processing of flat Yarns made from high-denier threads often have to be interrupted because the yarn breaks. The reason is probably due in the fact that the monofilaments are different

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Are subject to tension and that some or all of the monofilaments, the sieves, under low tension, are from the twine at or in front of the nip roll feed system separate and form unwanted soles that attach to the machine tangle and tear.

The present invention now relates to a method by which the likelihood of tearing Threads are greatly reduced or eliminated during the twisting process.

Thus, according to the invention, there is a method of twisting proposed a flat yarn made of high-denier threads, at which yarn is withdrawn from a supply, the yarn through the squeeze roller re-feeding system of a twisting device is moved forward and a certain twist is applied to the yarn, the process thereby is characterized in that some twist is applied to the yarn before it passes through the squeegee roller feed system passes through.

The twist applied should be sufficient to give the yarn a uniform or cohesive structure, like this that looping is prevented before passing through the nip roller feed system *

An ikBiM and preferred way of applying a twist to the yarn before the nip roll feed system is this _? to modify the latter in such a way that the twist applied by the twisting device is periodically allowed to run through the squeeze roller feed system so that a certain® in the yarn before its passage through the quetact **

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BATH ORIGINAL

The QuetHchrollfcoaui'uhroys-tem, which can have a single gap formed by a Bolle: ·:}. 'M; r, but U ¹ C) IIcν- ··? . · "Λβ1π '·; a plurality of gaps formed by a plurality of roller pairs aufvöjqt, modified such rtaß access. "■ wipe the rollers in the range-, b" w _u is oohen in the areas where the yarn cfurcb access hindurnhläufl "intermittently unterb2 *. A roll of the pair of rolls or one of each Ro'Uenpnars is modified in such a way that there is a recess in the curved surface, the ticx'e of the recess being somewhat larger than the yarn being treated ο A typical modified Holle is shown in the attached drawing * Surprisingly, this modified roller fulfills all / functions of a complete roller. In the squeeze roller feed system ^ w, dl: · Slip "; w is oh en dom .-? · :! Fvjiruten Tarn and the QuetpohrolüeneuführfsysteiE bintilit.

Alternatively k ^. 'W a role of the role pair or of each role pair'Fi duroi? in front of; shaped, such as, for example, pins, on the outer surface can be modified in order to periodically interrupt the access of the roller during the rotation

t'ai: i; - two such protrusions can be provided which are spaced on a line parallel to the axis of the roller.

Another wag to introduce a twist into the yarn before the Qugtsohrollenzuftihrsysteui is the use of a Wrong twisting device immediately before the squeezing roller to-guide ravotem =

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The method according to the invention can be part of the continuous process for making the yarn. However, ee generally becomes a downstream one Stage "forming in the treatment of the yarn"

Comparative example

A supply of seven polyester monofilaments, each with a diameter of 500 denier and wound side by side without twisting on a bobbin with 2 paddles, was wound on a conventional ring and traveler twisting machine at a spindle speed twisted at 3000 IT / min »The nip roll feed system consisted of 2 series of lower metal rolls with a diameter of 50y8 mm and a series of upper rubber-covered rolls of 63.5 mm diameter * which rested on the lower rolls Front roll fed * Daa yarn was sucked off the bobbin overhead with a tension of over 200 g, fed through the Quetschrollen ™ feed system and twisted to 80 rpm by the ring and traveler ~ Meehanisraus at a yarn tension of 300 g * In one attempt using this driving Ver ~ 70 torn i "of the yarn ends before 4000 m yarn per spindle had been processed. Such behavior is useless in technology "

In a “broad experiment, the upper roles in the modified according to the invention so that each had a recess, as shown in the accompanying drawing ist =, The result was that the tears in the yarn ends were reduced to a minimum, so that Process was technically feasible.

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Claims (5)

Claims Method for applying a twist to a flat Yarn from high-denier threads, in which yarn from withdrawn from a supply as yarn is fed through a nip roll feed system a 7-twisting device and a certain twist is applied to the yarn, characterized in that "ine certain Twist on the yarn before passing through the nip roll feed system is applied 2. The method according to claim 1, characterized in that the pinch roller feed system is modified in such a way that the twist applied by the twisting device can periodically run back along the yarn, so that a certain twist is present in the yarn before passage through the pinch roller feed system. 3 «Method according to claim 1 or 2» characterized in that that the nip roll feed system has one or more pairs of clods comprises, wherein a bulb of the or each pair of studs has a recess in the curved surface with the depth of the recess being slightly greater than the thickness of the yarn 4 »Method according to claim 3» characterized in that the recessed part or the recessed Hollen having the shape shown in the drawing the ■ or have. 5. The method according to any one of claims 1 to 4, characterized in that that the yarn is made from synthetic monofilaments is composed, each of which has a tit «·? in the area 109826/1612 of 100 Ma 1500 den. Device for applying a twist to a Yarn made from threads with a high value, which have a holder for a grass supply, a squeeze roller feed system with one or more squeeze roller panelsT ^ r? and a twister comprises, characterized in that a hollow of the or each pair of squeezing rollers in the curved surface has a recess, wherein the depth of the recess is slightly greater than the bead of the thread » Device according to claim 6, characterized in that the recessed roller or that the recessed Hollen has or have the shape shown in the drawing. 109826/1612