| 摘要 |
PURPOSE:To provide the titled fiber composed of polyethylene terephthalate, having flat cross-section, exhibiting X-shaped 4-spots interference pattern in small-angle X-ray scattering, having specific birefringence and specific flatness of the cross-section, and having excellent color fastness. CONSTITUTION:Molten polyehylene terephthalate is extruded, cooled, oiled, and wound. The wound filament is drawn and heat-treated with a slit heater to obtain the objective fiber exhibiting X-shaped 4-spots interference pattern in the small-angle X-raw scattering, having a birefringence (DELTAn) of the whole fiber of 0.08-0.12, and that of the amorphous region (DELTAna) of 0.015-0.06, and having a faltness of the cross-section of 200-600%.
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