Plastic and nonmetallic article shaping or treating: processes – Forming continuous or indefinite length work – Layered – stratified traversely of length – or multiphase...
Patent
1980-02-25
1981-08-18
Woo, Jay H.
Plastic and nonmetallic article shaping or treating: processes
Forming continuous or indefinite length work
Layered, stratified traversely of length, or multiphase...
264182, 425464, B29F 310
Patent
active
042845980
ABSTRACT:
The method for making bicomponent filaments from two spin dopes wherein the dopes are assembled into alternating layers in a feed tube leading to a transition tube connected to a conventional spinnerette, the layers then being fed through the transition tube and the spinnerette to form filaments. The feed tube has a constant cross-sectional area along the length thereof and the transition tube has a parabolic configuration such that the linear flow rate of the assembled dope layers passing through the transition tube decreases at a uniform rate as the cross-sectional area of the stream of assembled layers is increased to the cross-sectional area of the spinnerette, to thereby maintain the distinctness of the interfaces of the layers and thus insure that good bicomponent filaments will be formed.
REFERENCES:
patent: 1980234 (1934-11-01), Taylor
patent: 2034009 (1936-03-01), Taylor
patent: 2193316 (1940-03-01), Ferkes
patent: 2370765 (1945-03-01), Atwood
patent: 3217734 (1965-11-01), Fitgerald
Broad, Jr. Robert L.
Monsanto Company
Whisler John W.
Woo Jay H.
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