Composite fiber and its mfg. method

• Main Author: OH SONG-JIN,LEE JONG-JAE,SON GUK-RANG,GWON IL-HYON
• Format: Patent
• Language: English
• Published: 16.11.2005
• Edition: 7
• Subjects: APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBONFILAMENTS; CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS,THREADS, FIBRES, BRISTLES OR RIBBONS; CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, ORYARNS; LOOMS; MECHANICAL FINISHING OF YARNS OR ROPES; METHODS OF WEAVING; NATURAL OR ARTIFICIAL THREADS OR FIBRES; SPINNING; TEXTILES; WARPING OR BEAMING; WEAVING; WOVEN FABRICS; YARNS; YARNS OR THREADS

To provide a conjugate fiber having excellent stretchability and improved heat-set properties; and to provide a method for producing the conjugate fiber. The conjugate fiber having the excellent stretchability and the improved heat-set properties has ≥ 80% heat set properties after no-load boiling water treatment, and ≤ 20% rate of change in each of elastic moduli at 10% elongation and elongations at break before and after the heat set while having a high elasticity of ≥ 50% crimp elongation and ≥ 70% elastic recovery, and is produced by utilizing different fiber-forming polymers having 5,000-50,000 difference between number average molecular weights, and each 1.5-2.5 molecular weight distribution coefficient. The conjugate fiber produced by this fiber is obtained by minimizing the reduction of processability, functionality and physical properties caused by yarn-bending problems at spinning by minimizing the reduction of the molecular weight, properties of a raw yarn and elongation by reducing retention times of the polymers in a spinning pack, and utilizing a method for sticking strands under a spinning cap to form the fiber into a side-by-side shape having ≤1.2 curved surface deforming index and 1.3-2.5 modified cross section degree at the spinning.