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AssigneeToyo Boseki Kabushiki Kaisha
InventorsKazuyuki Yabuki, Takaharu Ichiryu, Tadao Kuroki, Mitsuhiro Sakuda
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Crimped polybenzazole staple fibers which satisfy the following specifications at the same time: (1) 2.ltoreq.number of crimps (number/inch).ltoreq.40 (2) 2.ltoreq.crimp index (%).ltoreq.30 (3) 0.3.ltoreq.crimp index/number of crimps.ltoreq.3.0; methods for manufacturing crimped polybenzazole staple fibers; and the rotary cutter therefor. The crimped polybenzazole staple fibers of the present invention are superior in crimp property and are useful for manufacturing spun yarn and unwoven fabric. According to the method of the present invention, crimped polybenzazole staple fibers superior in spinnability can be manufactured with ease. In addition, the cutting blade of the present invention stands a long time use for manufacturing staple fibers from a continuous filaments tow of high tenacity fibers.
A method for manufacturing crimped polybenzazole staple fibers, comprising subjecting a continuous polybenzazole filaments tow to crimping in a crimper box and cutting the obtained crimped fiber tow with a rotary cutter to form crimped polybenzazole staple fibers.
A method for manufacturing crimped polybenzazole staple fibers, which satisfies the following specifications at the same time:
A method for manufacturing crimped polybenzazole staple fibers, comprising extruding a spinning dope comprising polyphosphoric acid and polybenzazole from a spinneret, crimping the obtained dope filaments before bringing same into contact with a coagulation solution, and cutting said crimped fibers to form crimped polybenzazole staple fibers.
A method for manufacturing staple fibers, comprising cutting a filaments tow of high tenacity fibers having a filament tenacity of not less than 20 g/d with a cutting blade having a tip angle of not less than 46.degree. and not more than 90.degree. to form staple fibers.
Dependencies are inferred from the claim text.