Kanebo, Limited

Kiyoshi Yoshimoto

Yasuo Muramoto

Masami Fujimoto

Yoshiaki Morishige

Hiroshi Naito

Yukio Yamakawa

Yoshimichi Ozawa

Susumu Tokura

Yasushi Nakai

Teruyoshi Kawata

Tamotsu Matsutomi

Shigeru Tokutomi

Elastic polyurethane yarn and method of manufacturing the same

A composite elastic filament with a rough surface, consisting of a sheath component composed of a fiber-forming thermoplastic polymer, such as polyamide, polyester or polyolefin, and a core component composed of a fiber-forming elastomer, such as polyurethane or polyester elastomer, wherein the core/sheath conjugate ratio ranges from 1/1 to 100/1 by cross-sectional area and the core portion has a smooth peripheral surface uniformly extending in the direction of the filament axis while the sheath portion covering the core portion has numerous ridges rising along the circumference of the filament and closely spaced along the length of the filament. This filament can be readily produced by the melt conjugate spinning of the core and sheath components at the above-specified conjugate ratio, followed by drawing 1.1- to 10.0-fold and relaxation. The filament has excellent elastic properties, a small surface friction coefficient and a matting effect due to diffuse reflection of light caused by the rough surface, and is agreeable when worn in the form of a textile structure, particularly as lady's stockings.

Composite elastic filament with rough surface, production thereof, and

Potentially elastic conjugate fiber, production thereof, and production

Elastic composite filament yarn and process for preparing the same

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Hofu, Japan

Kiyoshi Yoshimoto