Means for the interlacing of yarn

Details Means for the interlacing of yarn Means for the interlacing of yarn

1989-04-05

1990-10-30

Petrakes, John

Textiles: manufacturing

Thread finishing

Surface modification of running length

28272, 28274, 57333, D02J 108, D02G 116

Patent

active

049659162

DESCRIPTION:

BRIEF SUMMARY
FIELD OF THE INVENTION

This invention relates to a means for voretxing for the interlacing multifilament yarns.


THE RELATED ART

Texturized yarns are understood to be yarns made bulky in any suitable manner, e.g. by means of false twist texturization, swelling chamber texturization, edging texturization etc. The texturization can also be achieved by curling of the filaments.
The interlacing, intermingling or tangling of yarns has the purpose of improving cohesion of the multi-filament yarn in question, and thus its further processability. In this case, the single multifilament yarn preferably consisting of thermoplastic material, as it nears the interlacing means, is still untwisted or has only little protective twist, which yields insufficient cohesion of the filaments for further processing. The multifilament yarn receives the necessary cohesion only through the interlacing of its filaments. The filaments of several multifilament yarns can, if required, be twisted together into a single multifilament yarn in a yarn channel, into which they enter together.
Interlacing means can preferably be applied to texturizing machines, but also to other machines and arrangements, e.g. stretch yarn or spooling machines, or can be operated independently.
In a known interlacing means of this type (U.S. 4,069,565), which is used for the tangling or intermingling of previously false twisted and thus texturized multifilament yarns, the yarn is led by means of yarn guides arrayed at a distance from the entrance and exit opening of the yarn channel. This is conducted in such manner that the yarn extends through the yarn channel in its longitudinal central axis parallel to its longitudinal direction and thus with all-around distance from the circumferential wall of the yarn channel. Alternatively the yarn is guided crossing the yarn channel obliquely in such manner that it contacts only the entrance and exit opening. In yarns produced by such interlacing means, there exist between the relatively short interlaced stretches longer, nontangled stretches which in the case of texturized yarns are bulky stretches. For further processing of the interlaced yarns the best possible cohesion of the filaments of the yarn is desired. Advantageously the nontangled stretches are not overly long and if possible exhibit approximately equal lengths. However, in the yarn there occurs frequently, in addition to the desired, relatively short nontangled stretches, other nontangled stretches several times the length of the shorter nontangled stretches. Thereby large differences in the cohesion of the filaments arise, so that the filament cohesion of the yarn is not particularly good. In the German technical language is has become usage to designate the cohesion of the filaments with "Fadenschluss" or in English, cohesion.
In the known arrangements of this type, only relatively low yarn advance velocities are attainable, because at higher yarn advance velocities, irregular advance of the yarn significantly impairs interlacing. However, for further processing of such yarns on weaving, knitting, tufting and other machines and arrangements, it is most of the time important that the filaments of the yarn have good cohesion, which facilitates and improves processing. It was therefore until now necessary to subject twisted multifilament yarns to secondary operations such as post-twisting, twisting, sizing etc. so as to improve the good cohesion necessary for further processing.
High speeds of yarn advance facilitate reduction of production costs. Thus in the case of false-twist texturizing machines, if they have interlacing means, the applicable yarn advance speeds are limited by the interlacing means and not by the means for texturizing the yarns. For example, known interlacing means for texturized yarn permit the attainment of yarn advance speeds of no more than 350 m/min, while the texturizing of the yarns as such could be possible with yarn advance speeds of e.g. 400 to 1000 m/min and more.
It is therefore an object of the invention to provide an i

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patent: 4240188 (1980-12-01), Zoina
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patent: 4644620 (1987-02-01), Maeda

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