Method of extruding polypropylene yarn

Details Method of extruding polypropylene yarn Method of extruding polypropylene yarn

1981-03-17

1982-08-31

Woo, Jay H.

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Shaping by extrusion

264211, 425208, D01D 522

Patent

active

043472079

ABSTRACT:
An extruder screw for extruding solution dyed polypropylene at low temperatures, for example, in the range 335.degree. F. to 365.degree. F., has feed, transition and metering sections, the length of the transition section being at least equal to the sum of the lengths of the feed and metering sections. The transition section has a compression ratio of at least 4.5:1 to create substantial backflow of the melt therein to thoroughly mix the melt. The transition section may be a continuous compression zone or have two compression portions connected by a dwell portion.

REFERENCES:
patent: 3650652 (1972-03-01), Dray et al.
patent: 4193961 (1980-03-01), Roberts
patent: 4225299 (1980-09-01), Roberts

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