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Method of making thick-and-thin fibers

  • US 4,389,364 A
  • Filed: 07/20/1981
  • Issued: 06/21/1983
  • Est. Priority Date: 12/06/1979
  • Status: Expired due to Fees
First Claim
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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:

  • (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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