Gear crimped polyester yarns

Details Gear crimped polyester yarns Gear crimped polyester yarns

1979-10-09

1981-06-16

Bell, James J.

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Including interlaminar mechanical fastener

28279, 428253, 428365, 428369, 428397, D03D 308, D02G 300

Patent

active

042738237

ABSTRACT:
A drawn gear-crimped polyester yarn with latent bulk is provided, the amount and nature of the bulk being such that the yarn has an initial crimp as defined of at least 1.5%, preferably of above 2%, and a mechanical crimp stability as defined of above 0%. The crimped polyester yarn may be produced by heating a drawable polyester yarn having a birefringence in the range 32.times.10.sup.-3 to 125.times.10.sup.-3 inclusive, preferably 35.times.10.sup.-3 to 125.times.10.sup.-3 inclusive, crimping the yarn by guiding it between the intermeshing teeth of a set of toothed wheels such that the yarn is caused to follow a sharply zig-zag path, the toothed wheels being rotated at a sufficient speed such that the yarn is drawn by the tension so imparted to the yarn by the toothed wheels and subsequently forwarding the crimped yarn from the teethed wheels under a controlled tension within the range 0.15 to 0.50 g per decitex inclusive, based on the decitex of the drawn polyester yarn.

REFERENCES:
patent: 3293843 (1966-12-01), Bilby et al.

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