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. 01, 1980
Filed:
Jun. 08, 1978
Gunter Koschinek, Dietzenbach, DE;
Dietmar Wandel, Muhlheim, DE;
Zimmer Aktiengessellschaft, , DE;
Abstract
A method for draw-off of polyamide threads at very high speeds, say 1800 to 5000 m/min, while maintaining high quality threads and producing stable packages. The method comprises heat treating the threads, after an initial air-blast cooling, by passing them through a spinning duct the walls of which are heated to a preselected temperature below 140.degree. C. and above T.sub.min. Minimum calculated from the following equation: ##EQU1## wherein v=draw-off speed in m/min, and T.sub.a is a temperature value=O for spinning ducts over 1500 mm in length, or 6.degree. C. for each 100 mm reduction in duct length under 1500 mm. The heat treated threads are subjected to a finishing and wetting operation and then drawn off at the high speed.