Method for making bicomponent filaments
AssigneeMonsanto Company
InventorJames P. Craig, Jr.
Life of this patent
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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.
Claims5
The method of making bicomponent filaments from two different spin dopes, comprising
- a. assembling said dopes into alternating layers in a feed tube connected to a transition tube leading to a spinnerette having a diameter greater than the diameter of the tube;
- b. and feeding the dope layers from the feed tube through the transition tube and the spinnerette to form filaments, said transition tube having a parabolic configuration such that the linear rate of flow of the dope layers through said transition tube decreases at a uniform rate along the length of the transition tube.
The method of making bicomponent filaments from a plurality of different spin dopes, comprising
- a. assembling the spin dopes into alternating layers in a feed tube, said tube being connected to a transition tube leading to a spinnerette.
- b. and feeding the dope layers through the transition tube and the spinnerette to form filaments, said transition tube having a cross-sectional area which increases directly with the distance from the inlet end of said transition tube to decrease the linear flow rate of the assembled layers at a uniform rate.
Dependencies are inferred from the claim text.