Control of synthetic yarns during drawing with heated rolls

Details Control of synthetic yarns during drawing with heated rolls Control of synthetic yarns during drawing with heated rolls

1980-07-31

1981-10-06

Woo, Jay H.

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Shaping by extrusion

28240, 2642108, 2642907, D01D 512

Patent

active

042935180

ABSTRACT:
The uniformity of bulked continuous filament yarns is improved by stabilizing the yarn path on draw pins and on heated draw rolls in a coupled spin-draw-bulk process wherein just before the yarn contacts a draw pin it is passed between two parallel guide pins in tandem in a zig-zag path which cause the plane of the yarn ribbon to rotate about the yarn axis by an angle of from 50.degree. to 90.degree. and back before contacting a draw pin. More uniform spreading of the yarn filaments on the heated rolls saves energy by permitting the use of lower roll temperatures.

REFERENCES:
patent: 3752457 (1973-02-01), Parmeggiani
patent: 3854177 (1974-12-01), Breen
patent: 3971202 (1976-07-01), Windley

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