The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 08, 2013
Filed:
Jan. 23, 2013
The Hong Kong Polytechnic University, Hong Kong, CN;
Xiao Ming Tao, Hong Kong, CN;
Bin Gang Xu, Hong Kong, CN;
Tao Hua, Hong Kong, CN;
Jie Feng, Hong Kong, CN;
Heng Guo, Hong Kong, CN;
Yunhui Jia, Hong Kong, CN;
Hong Kong Polytechnic University, Hong Hom, Kowloon, Hong Kong, CN;
Abstract
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.