Plastic and nonmetallic article shaping or treating: processes – Forming continuous or indefinite length work – Layered – stratified traversely of length – or multiphase...
Patent
1981-09-24
1983-09-27
Woo, Jay H.
Plastic and nonmetallic article shaping or treating: processes
Forming continuous or indefinite length work
Layered, stratified traversely of length, or multiphase...
4251315, 425198, D01D 300
Patent
active
044068506
ABSTRACT:
Sheath-core bi-component fibers are formed by an improvement of the method and apparatus described in U.S. Pat. No. 2,936,482 whereby molten sheath polymer is issued in ribbons into a recessed portion of the top surface of the spinneret from locations between rows of raised spinneret channel inlets. Ribbon flow of the sheath polymer is achieved in slot-like channels which are inter-leaved with rows of core polymer flow passages to optimize space utilization and spinneret channel density. Filtering of the core and sheath polymer is achieved in separate manifolds leading to the core flow passages and sheath slot-like flow channels which are kept to minimal length to minimize polymer residence time downstream of the filters.
REFERENCES:
patent: 2931091 (1960-04-01), Breen
patent: 3459846 (1969-08-01), Matsui et al.
patent: 3807917 (1974-04-01), Shimoda et al.
Hills Research & Development, Inc.
Woo Jay H.
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