Method of detecting yarn unevenness

Details Method of detecting yarn unevenness Method of detecting yarn unevenness

1997-05-30

1999-06-08

Noori, Max H.

Measuring and testing

Sheet, woven fabric or fiber

Filament

73159, G01N 2700

Patent

active

059101873

ABSTRACT:
Method of detecting yarn unevenness appearing as periodic variations of a spun yarn. First, plural yarn samples are taken. Then, k distinct spectrograms are obtained according to the number of the samples. These k spectrums are averaged to create an overall spectrogram. The height of adjacent channels in the overall spectrogram are averaged to create a reference spectrogram. Either the overall spectrogram of the distinct spectrograms are compared with the reference spectrogram of find those portions of the channels that exceed the reference spectrograms in height. These exceeding portions are displayed. Therefore, realistic defective added nonuniformities contained in the spun yarn can be easily detected.

REFERENCES:
patent: 3831444 (1974-08-01), Sasaki et al.
patent: 3945181 (1976-03-01), Yamazaki et al.
patent: 4491831 (1985-01-01), Sakai et al.
patent: 4774673 (1988-09-01), Aemmer
patent: 5570188 (1996-10-01), Nevel et al.
patent: 5592849 (1997-01-01), Nakade et al.

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