Method of extruding polypropylene yarn

Details Method of extruding polypropylene yarn Method of extruding polypropylene yarn

1980-03-15

1981-12-01

Woo, Jay H.

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Shaping by extrusion

264234, D01D 512

Patent

active

043036066

ABSTRACT:
A method of extruding multi-filament polypropylene yarn in which the polypropylene is extruded at a temperature below 425.degree. F., such as in the range 415.degree. F. to 350.degree. F., particularly about 400.degree. F., into a hot zone having a temperature sufficiently high to retard cooling of the extruded polypropylene yarn. The temperature of the hot zone can be within 60.degree. F. of the temperature of extrusion. The yarn is then passed through a quenching zone across which air is blown to cool the yarn. The swell value of the polypropylene can be less than 3 and its melt flow may be greater than 30. The yarn is drawn down in the hot zone and the filaments may be drawn down to an undrawn denier of less than 40.

REFERENCES:
patent: 3361859 (1968-01-01), Cenzato
patent: 3426754 (1969-02-01), Bierenbaum
patent: 3447202 (1969-06-01), kato
patent: 3560604 (1971-02-01), Papps
patent: 3662056 (1972-05-01), Ross
patent: 3987136 (1976-10-01), Schoppers
patent: 3999910 (1976-12-01), Pendlebury et al.
patent: 4045534 (1977-08-01), Fisher et al.
patent: 4159297 (1979-06-01), Mackie et al.
patent: 4193961 (1980-03-01), Roberts

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