Patent ID: 6716256
Filing Date: 2004-04-06
Classification: D02G,D06M,Y10T

Abstract:
A method for preparation of a slenderized crimped animal fiber with a fixed slenderized form having a lowering rate of tensile strength for undyed spun yarn of no less than 10%, fiber contraction in boiling water of no more than 1%, an alkali solubility of no more than 22% by weight and a UB solubility of no more than 35% by weight, comprising:a) a process wherein an actual twist is applied to an animal fiber sliver; b) a process wherein a twisted animal fiber sliver is swelled and plasticized by a basic aqueous solution and subsequently an anisotropic swelling is given to the animal fiber consisting of a bilateral structure; c) a reduction process wherein a disulfide bond in the anisotropically swelled and plasticized fiber is cleaved; d) a drawing process wherein the reduced and anisotropically swelled and plasticized fiber is drawn by practically 1.20 to 1.60 times; e) a process wherein the drawn animal fiber is oxidized to reproduce a disulfide bond; f) a process wherein the fiber is neutralized with an acid to be de-swelled; g) a drying process in an unstretched condition, wherein dipping and squeezing is repeated using at least each three pairs of squeezing rollers provided in each of an oxidation treatment bath, a neutralization treatment bath, and a hot water washing bath installed before the oxidation treatment bath and a hot water washing bath installed after the neutralization treatment bath, and the oxidation treatment is conducted at 15 to 25Â° C.