DE2005411A1 - Method and device for the manufacture of synthetic, crimped, highly elastic continuous yarns - Google Patents

Description

FARBENFABRIKEN BAYER AG LEVERKUSEN-Beyerwerk Pttem-AbteUune Reu / JD Feb. 5, 1970

Process and device for the production of synthetic, crimped, highly elastic endless yarns «-

The invention relates to a method for producing 'ä of synthetic, crimped, high elastic filament yarns with a reduced tendency to rotation of the false twist method and an apparatus for carrying out the method.

It is known to use the false twist method to convert threads made of synthetic material to ^ 3μ8β1η. For this purpose, the thread to be treated is turned up, fixed in the twisted state and continuously turned back. The thread produced in this way has a tendency to twist in accordance with the direction of rotation of the false twister during texturing. To avoid the skewing of the stitches caused by the twisting tendency of the yarn in the knitted fabric, two threads with opposite twisting tendencies are usually processed twisted together.

It is also known: " by means of a false-twisting process that follows the false-twisting process, but with the opposite direction of rotation, to reduce the tendency to twist. However, the second frizz treatment takes place because of a reduction the ripple effect instead.

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These known methods and devices are generally very complex in terms of their technical design and allow them In some cases only low goods speeds, above all it must be mentioned that all known processes are only can be used for narrowly limited titre ranges. The range of the mean titer should be mentioned in particular, for the Up to now there have not been any economically well-functioning processes; what is meant is the range of 100 - 400 dtex.

There has now been a process for the production of synthetic, thermoplastic continuous yarns with a particularly bulky, found highly voluminous and highly elastic character, in which one two threads or two thread bundles under preceding thermal treatment together wrongly twisted by a false-twist crimping device, the false-twist generated in the process fixed and at the same time rotates the two threads or thread bundles in opposite directions through mutual unwinding fixed. As a result, the tendency to twist of the yarn consisting of two individual threads or a bundle of threads is determined reduced when the elasticity is increased.

The method according to the invention makes it possible to save the twisting process or the subsequent false twisting process and to produce a highly elastic yarn with a reduced tendency to twist in one operation if the Twist two synthetic threads or the two thread bundles wrongly with one another and pull them apart in front of the fixing section so that that by mutual unwinding of the threads on each other a rotation of the individual threads or thread bundles is generated, which is opposite to the common rotation. Both rotation processes are fixed in the same operation.

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The method is preferably suitable for texturing threads or ¹ . Bundles of threads made from fully synthetic high polymers, especially from polyamides and high molecular weight linear polyesters and acrylonitrile polymers.

A device for carrying out the process is shown in Figures I and II. According to Figure I, the thread (1) and (2) coming from the bobbins runs through the delivery mechanism (3) to the two separating elements (4) via the heating device (5), which Separating members (6) to the false twist generator (7) and via the delivery plant (8) for winding (9). By rotating the false twister (7), a real rotation is generated in section A / B, which is canceled in section C / D using the false twist method. By rolling over one another | of the threads or thread bundles, however, the individual threads or thread bundles are rotated in the opposite direction of rotation in the section (4) to (6). The rotation in the single threads or thread bundles as well as in the double thread is fixed by the heating element (5), because the distance from the heating element to the separating elements is so short that the thread enters the thread combiner (10) while it is still hot. , ■

The angle for the optimal setting at the point of union is about 60 °, with a smaller angle the crimp becomes finely curved and with a larger angle it becomes coarse. The false twist crimp is at elevated temperatures (fixation) - and | carried out at temperatures between 100-220 ^{° C.} The number of turns is in the range of 5,000 - 15,000 turns / m.

Figure II shows that you can use the thread treated as above Separate the iC / D section and wind it up separately can.

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example 1

Two already drawn polyamide 6 threads in dtex 44 f 9 are made by the take-off godet (3) (see. Fig. I) with a take-off speed of 392 m / min, withdrawn and run over thread guide elements (4) or (6) the heating element (5), the internal friction twist generator (7) to the take-off godet (8), which runs at 400 m / min, equal to 2% speed difference compared to the take-off godet (3) is set. Then the threads ring-twisted together on heads (9). The direction of rotation due to the false twisting (7) is in subsection A / B in the S direction (see Fig. II) and according to the false twist method, the rotation in the Z direction is then in section C / D. Because the Threads are fixed in their position by the steering members (6), the false twist can only in the S-direction in the thread union point to run. Before the point of union, the two single thread bundles rotate in the Z direction.

The temperature of the heating element (5) is 180 ° C. The peripheral speed of the twist generator is set so that the thread experiences about 8000 revolutions per meter of incorrect rotation. The one made in this way Yarn has a crimp contraction of approx. 50% with a shrinkage in steam according to Wegener of 11% Cvergl. Much. 5.1966 pages 493-495). The final denier of the yarn is 88/18 dtex.

Example 2 :

Two undrawn polyamide 6 threads dtex. 100 f 24 are treated as in Example 1, but the speed of the godet (3) is 108 m / min and the speed of the godet (8) 400 m / min, so that a stretching ratio of 1: 3.7 results " ¹ and the temperature of the heating body is (5) 19O ⁰ C. the resulting yarn has a crimp contraction from about 45% at a shrinkage in steam of about 14%. the final linear density is 200 dtex 48 f.

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Example 3

Conditions as in example 2, but the texturing process passing thread bundle behind the false twister (7) in section C / D separated from the both godets (8) drawn off and ring-twisted onto 2 bobbins (9), The final titre is 100/24 dtex. The yarn obtained possesses a curl contraction of 40-45% with a shrinkage in Steam of approx. 16%.

Example 4 :

Two undrawn polyamide 6.6 threads in dtex 22 f 3 are treated as in Example 2, but the speed of the godet (3) is 160 m / min and the speed of the godet (8) is 500 m / min, so that a stretch ratio of 1: 3.22 is formed and the temperature of the heater is 175 ⁰ C. As shown in example 3, the fiber bundle are spread out behind the false twist unit (7) in part C / D is subtracted from the two galettes (8) and in two Bobbins (9) ring-twisted. The final titer is 22 f .3. The yarn obtained in this way has a crimp contraction of 50 - 55% with a shrinkage in steam of 9%,

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Claims (3)

Claims [1 i Method and device for the production of crimped yarns consisting of synthetic, thermoplastic Threads or thread bundles according to the false twist method, characterized in that two threads or two thread bundles together wrongly rotated by a false twist crimping device, the generated false twist is fixed and at the same time by mutual unwinding of the individual threads, the two threads or thread bundles are rotated and fixed in opposite directions. 2. The method according to claim 1, · characterized in that thread guiding elements are attached in front of and behind a heating and fixing zone to reverse the direction of rotation. 3. Apparatus for performing the method according to claim 1, consisting of the false twister (7) _f the thread combiner (10), the thread separating elements (4) and (6), the heating device (5) and the delivery mechanism (3). Le A 12 739 - 6 - 109833/1711 Lee rse (te