Toyo Boseki Kabushiki Kaisha

Yoshihisa Dammoto

Hisao Nishinaka

Takayoshi Fujita

Shigeo Nagira

Michio Ohota

Potential bulky polyester associated bundles or yarns for woven or knitted fabric include spontaneously heat extensible multi-filament A and heat shrinkable multi-filament B. The associated bundles are interlaced at 20-100 interlaces/m. For multi-filament A, the following physical properties apply: &lt;3 denier as a single bundle; 20-80% denier ratio content in associated bundles, wet shrinkage at 100.degree. C. (SHW (A))=0-5%, dry shrinkage at 160.degree. C. (SHD (A))=-15-0%. The properties pertaining to multi-filament B include: fracture tenacity&gt;4 g/denier, denier ratio of 80-29% content in associated bundles, SHW (B)&gt;5-60%. Additionally, SHD (B)-SHD(A)&gt;5%. The invention also relates to processes for forming the bundles and for weaving the bundles into fabric.

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Osaka, Japan

Yoshihisa Dammoto