Method of making thick-and-thin fibers
First Claim
1. In a method for producing thick-and-thin fibers having a thick-and-thin ratio of 4 to 50, defined as the ratio of the cross-sectioned area of the thick portion to that of the adjacent thin portion and having a fineness which changes gradually and periodically along the longitudinal direction thereof, the steps which comprise:
- (1) continuously extruding molten fiber forming polymer through spinneret holes at a constant throughput;
(2) running the extruded filaments through a gap, the length of which is in the range of 0.1 to 6 millimeters and plunging said filaments into a liquid for solidification or coagulation thereof;
(3) vibrating the solidified or coagulated undrawn filaments with a vibrating guide such that the vibrating frequency applied to the filaments is in the range of 100 to 10,000 cycles per minute and thereafter withdrawing them at a constant speed, and(4) drawing the undrawn filaments to produce a drawn thick-and-thin yarn.
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Accused Products
Abstract
Disclosed is a method of making a thick-and-thin fiber or fibers, wherein the fineness thereof changes gradually and periodically along the longitudinal direction thereof. The method comprises (1) a step wherein molten fiber forming polymer is extruded through spinneret holes at a constant throughput, (2) a step wherein the extruded filaments run through a short gaseous gap whose length is in the range of 0.1 to 6 millimeters before they plunge into liquid for abrupt solidification by cooling, (3) a step wherein the solidified undrawn filaments are touched by at least one vibrating substance before being withdrawn at a constant speed, (4) a step wherein the undrawn filaments are drawn by some roller systems, and (5) a step wherein the drawn filaments are thermally set.
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Citations
6 Claims
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1. In a method for producing thick-and-thin fibers having a thick-and-thin ratio of 4 to 50, defined as the ratio of the cross-sectioned area of the thick portion to that of the adjacent thin portion and having a fineness which changes gradually and periodically along the longitudinal direction thereof, the steps which comprise:
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(1) continuously extruding molten fiber forming polymer through spinneret holes at a constant throughput; (2) running the extruded filaments through a gap, the length of which is in the range of 0.1 to 6 millimeters and plunging said filaments into a liquid for solidification or coagulation thereof; (3) vibrating the solidified or coagulated undrawn filaments with a vibrating guide such that the vibrating frequency applied to the filaments is in the range of 100 to 10,000 cycles per minute and thereafter withdrawing them at a constant speed, and (4) drawing the undrawn filaments to produce a drawn thick-and-thin yarn. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification