Process and apparatus for measuring thermal shrinkage properties

Details Process and apparatus for measuring thermal shrinkage properties Process and apparatus for measuring thermal shrinkage properties

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
patent: 4393725 (1983-07-01), Satterfield
"Crimp Characterization Instrument," Research Disclosure, Apr. 1974, pp. 48-50.

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