Crimped multifilament and method for manufacturing the same

Details Crimped multifilament and method for manufacturing the same Crimped multifilament and method for manufacturing the same

1992-12-11

1994-01-25

Ryan, Patrick J.

Stock material or miscellaneous articles

Coated or structually defined flake, particle, cell, strand,...

428362, 428369, 428371, D02G 300

Patent

active

052814769

ABSTRACT:
A crimped multifilament composed of a thermoplastic polymer, wherein a birefringence index measured at an outer layer of a filament constituting said multifilament is larger than that of a birefringence index measured at a central portion of the filament, and said filament has a distribution in which a position having a smallest value of the birefringence index deviates from the center axis of the filament and random crimps of 10 per inch or more.
A crystal growth rate measured by a wide-angle X-ray diffractometry is 0.2 or more for a polyamide crimped multifilament and 0.4 or more for a polyester crimped multifilament.
A preferable method for manufacturing the crimped multifilament is that a multifilament extruded from. a spinneret (2) is applied with an aqueous liquid (5) to one side thereof up to state that a temperature of the multifilament becomes to a predetermined temperature, the obtained multifilament is drawn at the drawing ratio between 1.0 and 1.5 and then is applied with a liquid injecting treatment (for a nylon crimped multifilament) or a heat treatment under relaxation at the temperature of 150.degree. C. or more.

REFERENCES:
patent: 3608044 (1971-09-01), Coplan
patent: 3920784 (1975-11-01), Nakagawa et al.
patent: 4134882 (1979-01-01), Frankfort et al.
patent: 4195051 (1980-03-01), Frankfort et al.
patent: 4415726 (1983-11-01), Tanji et al.
patent: 4496505 (1985-01-01), Tanji et al.
patent: 4542063 (1985-09-01), Tanji et al.

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