Patent · US Expired

Method for melt spinning thermoplastic filament yarn

US4731217A · kind A · utility

6Cited by

11References

8Claims

0Family size

Assignee

Barmag AG · DE

Inventors

Siegmar Gerhartz · Remscheid, DE
Rolf Kalthoff · Wermelskirchen, DE
Siegfried Putsch · Lauterecken, DE

Key dates

Filing date	Aug 9, 1985
Grant date	Mar 15, 1988
Priority date	—
Expiry date	Aug 9, 2005

Classification

Technology area (CPC D)Textiles; Paper
CPC primaryD01D10/02
WIPO fieldTextile and paper machines
WIPO sectorMechanical engineering

Abstract

A method for melt spinning thermoplastic filament yarn is disclosed, wherein a plurality of filaments are withdrawn from a spinneret, and combined to form an advancing yarn. The advancing yarn is traversed onto a rotating bobbin to form a wound package, and the traversing speed is periodically rapidly changed so as to avoid the formation of undesirable patterns or ribbons. In addition, the advancing yarn is heated so as to lower its modulus of elasticity, so that the yarn tension and yarn denier remain within an acceptable range of variation during each change of the traversing speed.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.