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. 16, 2012
Filed:
Jan. 31, 2011
Josef Schmidtbauer, Vöcklabruck, AT;
Heinrich Schmidt, Vöcklabruck, AT;
Susanna Schiemer, Linz, AT;
Lenzing Aktiengesellschaft, Lenzing, AT;
Abstract
The present invention concerns a process for the manufacture of solid regenerated viscose fibers, comprising the steps of: —spinning a viscose spinning dope through a spinneret comprising spinning holes into a regenerating bath thereby forming filaments, —said viscose spinning dope having an alkali ratio immediately before spinning of from 0.7 to 1.0, preferably from 0.8 to 0.9, —at least part of said spinning holes having a circular orifice, —said regenerating bath containing—from 70 to 120 g/l, preferably 90 to 110 g/l sulfuric acid, —from 240 to 380 g/l, preferably 330 to 370 g/l sodium sulphate, —from 20 to 50 g/l, preferably 25 to 35 g/l zinc sulphate and said regenerating bath having a temperature of from 45 to 55° C., preferably 48 to 50° C., —stretching said filaments after leaving said regenerating bath in a secondary bath and/or in air at a stretching ratio of from 70% to 90%, preferably 80% to 90% of the maximum stretching ratio as hereinbefore defined and —treating said filaments with a fatty acid ester.