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Method and Apparatus for Imparting False Twist to Yarn before Ring Spinning

Summary

A method and apparatus for imparting false twist to a short staple yarn delivered from a nip of a pair of front drafting rollers before ring spinning. Downstream of the nip, the twisted yarn is drawn sequentially across first and second runs of travelling endless belts, such that the yarn wraps about a first convex surface of the first run, then passes between the first and second runs, before wrapping about a second convex surface of the second run. Friction between each of the first and second convex surfaces and the yarn imparts the false twist in a common direction. Maintaining a differential between first and second linear speeds of the first and second runs, respectively, has been found to reduce yarn defects, particularly the nep count.

Supplementary Information

Patent Number: US8549830B1
Application Number: US13747679A
Inventor: Tao, Xiao Ming | Xu, Bin Gang | Hua, Tao | Feng, Jie | Guo, Heng | Jia, Yunhui
Priority Date: 27 Mar 2012
Priority Number: US8549830B1
Application Date: 23 Jan 2013
Publication Date: 8 Oct 2013
IPC Current: D01H000752 | D01H000111
US Class: 057336 | 057075
Assignee Applicant: The Hong Kong Polytechnic University
Title: Method and apparatus for imparting false twist to yarn before ring spinning
Usefulness: Method and apparatus for imparting false twist to yarn before ring spinning
Summary: Method for imparting a false twist to a short staple yarn delivered from a nip of two front drafting rollers immediately before imparting real twist by ring spinning.
Novelty: Method for imparting false twist to short staple yarn delivered from nip of front drafting rollers, involves drawing yarn sequentially across runs of travelling endless belts, and maintaining runs at different respective linear speeds

Industry

Textile/fashion

Sub Category

Fabric Engineering

Application No.

US13747679A

Others

XIAO Ming-tao
Xu Bin-gang
HUA Tao
FENG Jie

Country/Region

USA