US 11,885,042 B2
Spinneret assembly for spinning polymeric fibers
Thomas Baker Taylor, Greenville, SC (US)
Assigned to CYTEC INDUSTRIES INC., Princeton, NJ (US)
Filed by CYTEC INDUSTRIES INC., Princeton, NJ (US)
Filed on Mar. 16, 2022, as Appl. No. 17/696,580.
Application 17/696,580 is a division of application No. 15/494,876, filed on Apr. 24, 2017, granted, now 11,306,413.
Claims priority of provisional application 62/326,978, filed on Apr. 25, 2016.
Prior Publication US 2022/0205138 A1, Jun. 30, 2022
Int. Cl. D01D 4/02 (2006.01); B29C 48/05 (2019.01); B29C 48/29 (2019.01); B29C 48/27 (2019.01); B29C 48/345 (2019.01); B29C 48/19 (2019.01); B29C 48/92 (2019.01); D01D 5/24 (2006.01); D01F 9/22 (2006.01)
CPC D01D 4/02 (2013.01) [B29C 48/05 (2019.02); B29C 48/19 (2019.02); B29C 48/271 (2019.02); B29C 48/29 (2019.02); B29C 48/345 (2019.02); B29C 48/92 (2019.02); D01D 5/24 (2013.01); D01F 9/22 (2013.01); B29C 2948/92333 (2019.02)] 2 Claims
OG exemplary drawing
 
1. A method for fiber spinning comprising:
providing a spinneret assembly comprising:
(a) a cap provided with an inlet port and a flared lower surface that flares outwardly from the inlet port in the direction of flow;
(b) a spinneret having an upper surface, a lower surface, and a central portion, said central portion having numerous spinning flow channels through its thickness; and
(c) a flow guide with a tapered geometry mounted in a cavity defined by the cap and the spinneret, said flow guide having an apex facing the inlet port, a base, and one or more side surfaces tapering up to the apex, said side surface(s) forming an acute angle with the base,
wherein a diverging flow passage is defined by the tapering side surface(s) of the flow guide and the cap's flared lower surface, the base of the flow guide is spaced apart from the upper surface of the spinneret, creating a space that is in fluid communication with the divergent flow passage, and the space between the flow guide's base and the spinneret's upper surface is void of any intervening structure;
continuously feeding a raw material in the form of a polymer solution or molten polymer into the inlet port of the spinneret assembly and ejecting the raw material through the numerous spinning flow channels in the spinneret, forming a plurality of continuous filaments,
wherein the raw material from the inlet port flows through the diverging flow passage and then radially inward into the space between the flow guide's base and the upper surface of the spinneret, filling said space.