Non-woven fabric defect detecting device

Details Non-woven fabric defect detecting device Non-woven fabric defect detecting device

1976-03-26

1978-02-21

Smith, Alfred E.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250572, 356238, G01N 2132

Patent

active

040754987

ABSTRACT:
Disclosed is a non-woven fabric defect detecting device in which light is applied to a travelling non-woven fabric to optically or electrically scan the non-woven fabric in its widthwise direction and the light from each point on the non-woven fabric is converted into an electric signal. The converted electric signal is classified into a plurality of levels to detect at least a hole and a heavy filling bar. The durations of these detected outputs are counted in the form of clocks and grading of the quality of the non-woven value is achieved based on the count values. The abovesaid converted output is differentiated and the differentiated output above a predetermined level is detected as fold bar.

REFERENCES:
patent: 3534402 (1970-10-01), Crowell et al.
patent: 3588513 (1971-06-01), Takatsuki et al.
patent: 3729619 (1973-04-01), Laycak et al.
patent: 3866054 (1975-02-01), Wolf
patent: 3898469 (1975-08-01), Nichols et al.

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