| 摘要 |
PROBLEM TO BE SOLVED: To obtain a polyester hollow fiber excellent in crimp developing property in producing method which is small in kneeling phenomenon by keeping and improving hollow ratio so as to improve bulky performance. SOLUTION: This polyester hollow fiber is obtained by arranging two kinds of polyesters having 0.05 0.25 difference of intrinsic viscosity in side by side type and carrying out conjugate spinning using polyethylene terephthalate in which 1-9mol% isophthalic acid is copolymerized as a polymer having high viscosity. The hollow fiber has >=35cm bulkiness (H0 ),>=15cm H3 , >=74% (H3 /H1 )×100 difficulty in permanent set in fatigue and >=48% (H3 /H0 )×100 recovery of bulkiness.
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