Title: Process for the production of stretch-textured yarns with improved properties

Abstract: The present invention relates to a process for the simultaneous stretch-texturing of synthetic, at least partly thermoplastic filaments or yarns using false twisters, more especially friction false twisters wherein the ratio S.sub.2 /S.sub.1 between the tractive or tensile forces S.sub.1, acting on the filament before the false twister, and S.sub.2, acting on the filament after the false twister, is adjusted to from 1.0 to 1.4 by adapting the ratio between the rotational speed of the false twister and the rate of travel of the filament or yarn, and the denier-related twisting of the yarn is from 5 to 50% higher than the level of twisting which is normally applied in conventional false-twist texturing processes using a spindle and which can be calculated on the basis of the Heberlein formula. Moreover, the invention relates to a yarn produced by the afore-described process.

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Inventors: Bueb, Michael (Opladen, DT)
Rellensmann, Wolfgang (Zons, DT)
Ruuprecht, Lothar (Dormagen, DT)

Application Number: 575704
Filing Date: 1975-05-08
Publication_date: 1977-07-12
Assignee: Bayer Aktiengesellschaft (Leverkusen, DT)
Primary Class(es): 57/288 57/342
Other Classes:
US Patent Ref:

3756006	Sep, 1973	Heinroth et al.	57/77.
3846966	Nov, 1974	Peacock et al.	57/157.
3879927	Apr, 1975	Bueb et al.	57/77.
3948034	Apr, 1976	Gorden	57/157.

Other Refs:
Primary Examiner: Queisser, Richard C.
Assistant Examiner: Gorenstein, Charles
Attorney: Plumley and Tyner