Claims
- 1. A spinneret for the production of a hollow filament comprising: a plate having a nozzle having an entrance hole extending therethrough to a complex orifice defined by a plurality of separate slots curved about the center of the orifice, each of said slots having a tapered entrance connecting said hole with said slot and a center line, said tapered entrance forming an inbound angle and outbound angle with respect to said center line, wherein said inbound angle is greater than the outbound angle and the sum of the inbound angle plus the outbound angle does not exceed 55 degrees, whereby a flow of polymer through the complex orifice in polymer streams causes the polymer flowing in each stream to flow faster on the outside of the slots to create an inward bending movement of the polymer streams exiting each slot toward one another to improve coalescence in forming the hollow filament.
- 2. The spinneret of claim 1, wherein said inbound angle is 27.5.degree. and said outbound angle is 15.degree..
- 3. The spinneret of claim 1 wherein the ratio of the inbound angle to the outbound angle is between 1.1 and 5.5.
CROSS-REFERENCE TO RELATED APPLICATION
This application is a continuation-in-part of application Ser. No. 07/925,042 filed Aug. 5, 1992.
US Referenced Citations (16)
Foreign Referenced Citations (4)
Number |
Date |
Country |
0142208 |
Jun 1980 |
DEX |
43-20250 |
Aug 1968 |
JPX |
0843179 |
Aug 1960 |
GBX |
1160263 |
Aug 1965 |
GBX |
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
925042 |
Aug 1992 |
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