| 摘要 |
PROBLEM TO BE SOLVED: To obtain a thermally adhesive composite fiber capable of giving a soft and bulky non-woven fabric. SOLUTION: This thermally adhesive fiber is a sheath-core type composite fiber having >=5% shrinkage after dry heat-treatment at 120 deg.C, and consisting of a polyolefin as a sheath component and a polyester having >=20 deg.C higher melting point than that of the polyolefin as a core component, and obtained by performing a hot air heat-treatment under a tensionless state at >=10 deg.C higher than the glass transition temperature of the polyester and >=20 deg.C lower than the melting temperature of the polyolefin after imparting a stretch and crimps after its spinning. The method for producing the same fiber is also provided.
|
