Plastic and nonmetallic article shaping or treating: processes – Forming continuous or indefinite length work – Shaping by extrusion
Patent
1976-03-04
1977-01-04
Woo, Jay H.
Plastic and nonmetallic article shaping or treating: processes
Forming continuous or indefinite length work
Shaping by extrusion
57140BY, 264103, 428397, B28B 2154
Patent
active
040013693
ABSTRACT:
Improved process control for cospinning synthetic trilobal filaments having different modification ratios is provided by spinning filaments of one modification ratio through spinneret orifices consisting of three radially intersecting slots wherein each slot has parallel sides and spinning filaments of another modification ratio through spinneret orifices consisting of three radially intersecting slots which taper with increasing distance from the center of the orifice. The modification ratio of filaments spun from the orifices having tapered slots is less sensitive to changes in normal spinning process conditions than is the modification ratio of filaments spun from the orifices of slots having parallel sides. This differential response of filament modification ratio to spinning conditions provides better process control of the modification ratio differential between the filaments.
REFERENCES:
patent: 2939201 (1960-06-01), Holland
patent: 3220173 (1965-11-01), Pitzl
patent: 3253301 (1966-05-01), McGlaughlin
E. I. Du Pont de Nemours and Company
Woo Jay H.
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