DE4118223A1 - Combined bundled and twisted yarn - uses pneumatic false-twister for drawn sliver followed by centrifugal spinning - Google Patents

Abstract

To produce a combined bundled yarn, with a true twist, a drawn sliver of the required final thickness is partially bonded in a pneumatic false twister in a bundling process. It then passes to a centrifugal spinning process to give a true twist of the cladding fibres in a tight winding round the whole yarn cross section. The spinning speed in the centrifugal spinning stage is pref. identical to the yarn speed through the yarn bundling process. The high draft drawing unit has three and pref. four pairs of rollers, condensers and belts. It is followed by a special air jet or a combination of air jets, and at least one further pair of rollers. The final stage has at least one centrifugal spindle with a yarn guide tube. ADVANTAGE - The method gives faster mfg. speeds to give a yarn of high strength and a similar structure to conventionally spun yarns.

Description

The invention relates to yarn production after bundling principle with subsequent issuing of real rotations in one Centrifuge.

By bundling the yarn with sheath fibers, only one becomes Partial consolidation of the yarn at high delivery speeds enough. In the immediately downstream centrifuge spinning process receives the bundling yarn through a small percentage of real Twists the ultimate strength at high yarn manufacturing speed.

The further development of yarn production affects above all Yarn manufacturing cost, yarn quality and manufacturing ge dizziness. Process combinations are known in which two successive yarn formation principles in one ge velvet process each produce a partial consolidation of the yarn. The term hybrid spin is also sometimes used for such processes used.

The most developed is the combination of rotor spinning and subsequent ring spinning (Melliand Textile Reports 64 (1983) 4th - p. 251-252; 67 (1986) 6. - pp. 395-397; OE Report 9 (1985) No. 52 .-- p. 5). However, there are also proposed solutions for the combination OE rotor spinning with subsequent bundling after Air False Wire Process (Textiltechnik 37 (1987) 5th - pp. 240-243; DE 32 39 089; DE 32 46 960; DE 34 30 369; DE 35 39 383).

Furthermore, the false wire bundling spinning with the ring spin NEN combined (EP 00 51 470; DE 34 24 632; DE 37 24 045).

On the other hand, combinations of bundling spiders and Partial yarn strengthening with subsequent twisting process known  (PLYFIL; MURATA TWINSPINNER). The yarn can with a maximum 250. . .350 m / min can be produced. Here is the end product however, a thread, the single yarn strength still from a company process must suffice.

The highest yarn production speeds were for the OE friction spinning with 300. . . 400 m / min predicted. It is ever but so far not succeeded in yarn required for fine yarns to achieve structures and strengths.

The yarn production becomes fast for the bundle spinning speed at 200. . . Be limited to 250 m / min. With the OE rotor spinning only about 100 for medium and fine yarns. . . 150 m / min be enough. The ring spinning is even with special measures (driven ring, Cerifil) for the yarn count mentioned range cannot exceed about 30 m / min.

The yarn structure according to a classic process, as with for example ring or centrifuge spinning, is the wün most worthwhile.

The decisive criterion for the speed of yarn production is the speed of rotation and the number of turns. If the number of revolutions is divided, the number of revolutions is the same len of the rotation-imparting organs a higher yarn production speed possible.

Although with ring spinning as the final stage, that with OE spinning or bundling spinning pre-consolidated yarn real twists con The limit is always given over the yarn cross-section the take-off speed is doubled to three times the sole ring spinning is a decisive disadvantage.

Furthermore, a bundling process should be implemented without secondary influences if possible. That means a low twisted yarn with a constant low yarn tension and guaranteeing an adjustable spinning distortion V _Sp ≦ 1, which enables the length to be shortened as a result. Therefore devices according to EP 00 51 470 with full yarn twist in the bundling zone and bundling of an already relatively closed OE yarn according to DE 32 38 089; DE 32 46 960; DE 34 30 369 and DE 35 39 383 according to parts in the yarn structure and strength. OE yarns do not have a constant yarn speed over the yarn cross-section. If the first process section of hybrid spinning is an OE spinning process, there are further disadvantages with regard to the achievable yarn fineness, which are greater than 13 as a result of the only partial consolidation. . . 14 tex must be.

The invention is based, a method and a task To develop a device that makes it possible to or roving template with high delivery speed and then give him real spins to make one high yarn tenacity and a structure similar to ring yarn to reach.

According to the invention the object is achieved by doing this Yarn in a two-step process first in an air false wire bundling process partially consolidated. Then in a centrifuge spinning process by giving the wrapping fibers real twists taut across the entire yarn cross section wraps.

Since the air-false wire bundling process is not yet the end valid yarn tenacity should be achieved, this first Process section designed with higher production speed than bundle spinning alone.

The speed in the spinning process is just as high as the Ge speed of the yarn bundling process.  

A high drafting system is used to carry out the process arranged, which with a centrifuge spinning device in Connection is established.

The high drafting system consists of several, preferably four pairs of rollers, which compressor and apron assigned are. There is either a special air nozzle behind the drafting system or an air nozzle combination. This will make the Spinning of conveyor belt at high spinning speeds made possible because that at the drafting system exit to the final fineness warped fiber ribbon summarized and thus an increased Fiber loss in the drafting system suction can be prevented. The Edge fibers are integrated into the yarn.

There is at least one between the two spinning devices Pair of rollers, which the return of the following real Prevents yarn twists and a special warp setting in the bundling zone.

With the speed in the bundling process, the yarn is in egg placed a centrifuge, whereby there are real rotations for further Strength increase received.

The invention is based on an exemplary embodiment forth be explained. In the accompanying drawing:

Fig. 1 shows the schematic structure of the apparatus,

Fig. 2, the partially consolidated yarn after the bundling process and

Fig. 3 shows the yarn after the final consolidation.

The sliver 1 is fed to the drafting device via a belt compressor 2 . In the entrance stretching area and in front of the apron draft zone, the compressors 3 and 4 are used to improve the drafting process and the strip uniformity. Two straps 5 are arranged in the last draft zone.

The drafting system consists of four pairs of rollers 6 ; 7 ; 8 ; 9 . However, it is also possible to use three or five pairs of rollers. Rollers to prevent the lateral Faserabspreizungen due to axial flow away ßender circumferential air flows of the rapidly rotating output 9 can still be placed between the compressor and the rollers Riemchenausgang. 9

After the drafting system, two air nozzles 10 and 11 follow, which bundle the serum ribbon 1 with oppositely rotating air streams. The following take-off rollers 12 prevent the following real yarn twists from running back into the bundling zone. The roller pairs 9 and 12 are adjusted with respect to the spinning to be granted and the relatively low yarn tensile force with a delay V _Sp ≦ 1.

The throughput speed of the yarn through the bundling zone is V _{G, B} = 250. . . 350 m / min selected maximum. The larger it is, the closer V _Sp → 1 must be selected. Otherwise there is an excess length due to less spinning, which can lead to ball collapse. The size of the speed depends on the yarn count, the fiber, the fiber length and the desired size of the partial consolidation. With this high speed v _{G, B} , the partially consolidated bundle yarn is fed into the zone of centrifugal spinning.

The centrifuge spindle 14 rotates with the greatest possible speed, wherein the yarn after obtaining true rotations over a yarn guide 13 in cylindrical or conical Wick lung lay is stored in the centrifuge spindle fourteenth The spinning process in the centrifuge is connected with the issue of a certain number of real turns and a further partial consolidation.

After the centrifuge spindle 14 is filled with yarn 15 , the yarn is placed on it by inserting a sleeve or fed to a winding device via a pair of draw-off rollers by the step spinning method. Further twists of thread are issued for the final thread strength.

Immediately in front of the pair of rollers 12 , the core has lost its false twists and the sheath fibers, for example, run relatively loosely in the Z direction around the yarn core in FIG. 2. After the take-off rollers 12 , the partially consolidated bundling yarn receives a further increase in strength through real rotations during centrifugal spinning ( FIG. 3). There is no core rotation coefficient of α _m = 80. . . 130 as with classic twisted yarns, but a lower twist coefficient that tightens the loose sheath fibers to the core and at the same time produces the necessary strength and a more homogeneous fiber closure of the core itself.

List of the reference numerals used

1 sliver
2 belt compressors
3 compressors
4 compressors
5 straps
6 pairs of rollers
7 pair of rollers
8 pairs of rollers
9 pair of rollers
10 air nozzle
11 air nozzle
12 pairs of rollers
13 yarn guide tube
14 centrifuge spindle
15 yarn

Claims (3)

1. A process for producing a combined bundled and real twisted yarn with largely classic yarn structure in a two-stage process, characterized in that the fiber ribbon warped to final fineness is partially solidified in an air-false wire bundling process and then in a Zen trifuge spinning process by imparting real twists the umwin defibres are wound tightly over the entire yarn cross section. 2. The method according to claim 1, characterized in that the Spinning speed in the spinning centrifuge is just as great like the speed of the yarn bundling process. 3. A device for performing the method according to claim 1 and 2, characterized in that following a Hochver train drafting system consisting of three, preferably four pairs of rollers ( 6 ; 7 ; 8 ; 9 ), compressors ( 2 ; 3 ; 4 ) and straps ( 5 ), a special air nozzle ( 10 ) or an air nozzle combination ( 10 ; 11 ) at least one further pair of rollers ( 12 ) and at least one centrifuge spindle ( 14 ) with yarn guide tube ( 13 ) are arranged.