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:
Jan. 02, 2007
Filed:
Sep. 15, 2003
Yves Bader, Thoiry, FR;
Yves Bader, Thoiry, FR;
E. I. du Pont de Nemours and Company, Wilmington, DE (US);
Abstract
A substantially torqueless composite dual core-spun yarn () has a substantially inelastic central hard core () covered with a dual-spun fiber covering (). The central hard core () has an elongation at break less than 50% and a Z or S twist, and the fiber covering () comprises fibers twisted on the core () with an S or Z twist opposite to that of the core. The opposite twists of the core () and of the covering () exert opposite and substantially equal torques. This yarn is produced by introducing two slivers (A,B) forming the covering () and a central core in a spinning triangle (). The core () is fed overtwisted S or Z and the slivers (A,B) have an opposite Z or S twist corresponding to about 30% to 70% of the twist of the fed overtwisted core () that detwists during spinning. The inelastic core () is fed at controlled speed to compensate for the angle of feed and to compensate for detwisting, and is guided into the spinning triangle () by a guide groove () in a feed roller ().