Process for high-speed spinning of polyamides

Details Process for high-speed spinning of polyamides Process for high-speed spinning of polyamides

1978-06-08

1980-01-01

Woo, Jay H.

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Shaping by extrusion

264235, D01F 704

Patent

active

041816978

ABSTRACT:
A method for draw-off of polyamide threads at very high speeds, say 1800 to 5000 m/min, while maintaining high quality threads and producing stable packages. The method comprises heat treating the threads, after an initial air-blast cooling, by passing them through a spinning duct the walls of which are heated to a preselected temperature below 140.degree. C. and above T.sub.min. Minimum calculated from the following equation: ##EQU1## wherein v=draw-off speed in m/min, and T.sub.a is a temperature value=O for spinning ducts over 1500 mm in length, or 6.degree. C. for each 100 mm reduction in duct length under 1500 mm. The heat treated threads are subjected to a finishing and wetting operation and then drawn off at the high speed.

REFERENCES:
patent: 2957747 (1960-10-01), Bowling
patent: 3946100 (1976-03-01), Davis et al.
patent: 3987136 (1976-10-01), Schippers
patent: 3994121 (1976-11-01), Adams
patent: 4093147 (1978-06-01), Bromley et al.

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