Spinning process

Details Spinning process Spinning process

1980-02-12

1981-11-03

Woo, Jay H.

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Shaping by extrusion

264184, 2642103, 425 70, D01D 514

Patent

active

042985650

ABSTRACT:
A process for preparing high strength, high modulus aromatic polyamide filaments by extruding an acid solution containing at least 30 g. per 100 acid of an aromatic polyamide having an inherent viscosity of at least 4 and chain extending bonds which are either coaxial or parallel and oppositely directed through a layer of inert noncoagulating fluid into a coagulating bath and then through a spin tube along with overflowing coagulating liquid is improved by jetting additional coagulating liquid symmetrically about the filaments in a downward direction forming an angle .theta. or 0.degree. to 85.degree. with respect to the filaments within 2.0 milliseconds from the time the filaments enter the spin tube, the flow rates of both the jetted and overflowing coagulating liquid being maintained at a constant rate such that their momentum ratio .phi. is from 0.5 to 6.0 and the mass flow rate of total coagulating liquid is from 70 to 200 times the mass flow rate of the filaments.

REFERENCES:
patent: 2437263 (1948-03-01), Manning
patent: 2510135 (1950-06-01), Pedlow et al.
patent: 3689620 (1972-09-01), Miyazaki et al.
patent: 3833438 (1974-09-01), Kaneko et al.
patent: 3996321 (1976-12-01), Weinberger
patent: 4070431 (1978-01-01), Lewis et al.
patent: 4078034 (1978-03-01), Lewis

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