Measuring and testing – Sheet – woven fabric or fiber – Filament
Patent
1983-04-08
1986-01-28
Levy, Stewart J.
Measuring and testing
Sheet, woven fabric or fiber
Filament
28219, 28281, 7386248, G01N 3336
Patent
active
045663190
ABSTRACT:
The thermal shrinkage properties of yarn are measured by applying heat treatment to the yarn while it travels through a straight yarn path formed between a feed roller and a draw roller. The peripheral speed of the feed roller is set at a desired constant peripheral speed V.sub.1. The tension T of the yarn is detected at the downstream of the feed roller, and the peripheral speed of the draw roller is controlled at a speed V.sub.2 so that the detected tension T becomes equal to a desired preset tension T.sub.0 of the yarn. The thermal shrinkage S(%) is measured through the computation of S=[(V.sub.1 -V.sub.2)/V.sub.1 ].times.100. If the controlling of the peripheral speed V.sub.2 of the draw roller is effected so that V.sub.2 /V.sub.1 =a desired constant value, the detected tension of the yarn can be used for measuring the thermal shrinkage stress of the measured yarn.
REFERENCES:
patent: 2385894 (1945-10-01), Taylor
patent: 3726137 (1973-04-01), Denton
patent: 3762220 (1973-10-01), Gusack et al.
patent: 4295252 (1981-10-01), Robinson et al.
patent: 4295360 (1981-10-01), Fountain
patent: 4347993 (1982-09-01), Leonard
patent: 4393701 (1983-07-01), Lawson
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"Crimp Characterization Instrument," Research Disclosure, Apr. 1974, pp. 48-50.
Kumo Ichiro
Torikai Jun
Yamazaki Chikayasu
Chapman, Jr. John E.
Levy Stewart J.
Miller Austin R.
Toray Industries Inc.
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