US 6,982,118 B2
Polyester type conjugate fiber package
Tadashi Koyanagi, Nobeoka (Japan); and Takao Abe, Nobeoka (Japan)
Assigned to Asahi Kasei Fibers Corporation, Osaka (Japan)
Filed on Oct. 07, 2004, as Appl. No. 10/959,662.
Application 10/959662 is a division of application No. 10/286894, filed on Nov. 04, 2002, granted, now 6,824,869.
Claims priority of application No. 2001-340286 (JP), filed on Nov. 06, 2001; and application No. 2001-393491 (JP), filed on Dec. 26, 2001.
Prior Publication US 2005/0084676 A1, Apr. 21, 2005
Int. Cl. D01F 6/00 (2006.01)
U.S. Cl. 428—364 6 Claims
OG exemplary drawing
 
1. Polyester pre-oriented conjugate fiber of either a side-by-side or an eccentric sheath/core configuration in which two kinds of polyester components are adhered to each other to form a single filament, wherein at least one of the components consisting of the single filament is polytrimethylene terephthalate containing repeating units of trimethylene terephthalate of 90 mol % or more, and wherein the pre-oriented conjugate fiber is wound to form a package and satisfies the following items (1) to 5:
(1) a stretching elongation Vc prior to being treated with boiling water is less than 20%,
(2) an elongation at break is in a range from 60 to 120%,
(3) a dry heat shrinkage stress value is in a range from 0.01 to 0.15 cN/dtex,
(4) the difference in dry-heat shrinkage stress value between the conjugate fibers layered in the selvage portion and the central portion of the package is 0.05 cN/dtex or less, and
(5) a yarn fineness variation value U% is 1.5% or less and a variation coefficient of a yarn fineness variation period of 0.4 or less.