To obtain a polyester-based combined filament yarn capable of giving at low cost knitted fabrics with excellent puffiness, softness, resilient feel and touch feel, by simultaneously spinning plural kinds of filaments differing in orientation degree from one another into an undrawn hetero-orientation degree combined filament yarn, which is then drawn.
This polyester-based combined filament yarn is obtained by the following process: two or more kinds of filaments differing in orientation degree from one another are spun simultaneously into an undrawn hetero- orientation degree combined filament yarn, which, in turn, is substantially drawn so that the filaments of higher orientation degree turn into shrinkable filaments, while those of lower orientation degree into self-extensible filaments; wherein it is preferable that the self-extensible filaments have a dry heat shrinkage of -5 to 0% and boiling water shrinkage of ≤1%, and the shrinkable filaments has a dry heat shrinkage of ≥8%, and the dry heat shrinkage difference between the above two kinds of filaments is ≥10%.
SATO MASAYUKI
KIDAI AKIRA
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