Method of inspecting coated web material to detect the presence

Details Method of inspecting coated web material to detect the presence Method of inspecting coated web material to detect the presence

1980-11-28

1982-09-07

Rosenberger, R. A.

Optics: measuring and testing

By monitoring of webs or thread

For flaws or imperfections

250563, G01N 2117

Patent

active

043481140

ABSTRACT:
This invention relates to a method of inspecting coated web material in order to detect the presence of downlines. The coated web material is transported past an inspection station and is inspected transversely point by point across the web width. Data signals are produced responsive to variations in coated thickness. The inspection operation is repeated as the web pass the inspection station and the data signals from points at the same distance across the web width are summed to produce an average signal waveform. Any abnormal excursions of the averaged signal waveform are registered as faults.

REFERENCES:
patent: 3541340 (1970-11-01), Binks
patent: 3556664 (1971-01-01), Blaisdell et al.
patent: 3618063 (1971-11-01), Johnson
patent: 3898469 (1975-08-01), Nichols et al.
patent: 4005281 (1977-01-01), Faulhaber et al.
patent: 4048510 (1977-09-01), Clarke et al.
patent: 4118127 (1978-10-01), Klein et al.
patent: 4274748 (1981-06-01), Burtin et al.

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