Patent ID: 7968481
Filing Date: 2011-06-28
Classification: D01F,D04H,Y10T

Abstract:
1. A heat fusible conjugate fiber produced by high-speed melt spinning, and after the spinning, a crimp treatment but no drawing, which comprises: a first resin component having an orientation index of 40% or higher; and a second resin component having a lower melting or softening point than the melting point of the first resin component and an orientation index of 16% or lower, the second resin component being present on at least part of the surface of the fiber in a lengthwise continuous configuration, wherein said fiber has negative heat shrinkage values at a temperature higher than the melting point or softening point of the second resin component by 10° C., and increases in length upon heating, and wherein the heat fusible conjugate fibers are staple fibers of 30 to 70 mm in length; wherein the first resin component comprises polypropylene, and the second resin component comprises high-density polyethylene; wherein the take-up speed during high-speed melt spinning is 1360 m/min or higher; wherein said fiber has a negative heat shrinkage value of at least −0.33% to −20% at a temperature higher than the melting point or softening point of the second resin component by 10° C., and increases in length upon heating.