Melt spinning process

Details Melt spinning process Melt spinning process

1978-08-11

1980-03-18

Woo, Jay H.

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Shaping by extrusion

264180, 425 71, D01D 508

Patent

active

041939620

ABSTRACT:
Apparatus and method are described for extruding filaments of thermoplastic material, particularly polypropylene, by liquid quench melt spinning in which a baffle arrangement is disposed in the quench liquid around the location where the filaments enter to reduce turbulence, vortexing, and liquid level variation. The baffle arrangement forms an opentopped box-like structure with two quench liquid inlet apertures and one quench liquid outlet aperture. Yarn guides are disposed inside this structure and the filaments, after solidifying, pass around the yarn guides and then upwards, at an angle of about 30 degrees to the horizontal, through the quench liquid outlet aperture. The passage of the filaments creates a pumping action of the quench liquid in through the two inlet apertures and out through the outlet aperture. The area of the outlet aperture is less than the sum of the areas of the inlet apertures, to create an inefficient pump. Wetting agent is introduced through four nozzles at the liquid surface adjacent the back of said structure.

REFERENCES:
patent: 3664782 (1972-05-01), Nevin
patent: 3856445 (1974-12-01), Norwood
patent: 3905381 (1975-09-01), Meger
patent: 3932576 (1976-01-01), Patel

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