Method for automatic film thickness control

Details Method for automatic film thickness control Method for automatic film thickness control

1994-04-20

1995-03-28

Beck, Shrive

Coating processes

Measuring, testing, or indicating

427 9, 427356, 4274342, 118680, 118712, 118413, 118419, B05D 312

Patent

active

054015294

ABSTRACT:
Paint or the like coating is applied to a gap between an elongated strip article and an extended surface, such as a coating head. A variable load, such as provided by air cylinders, is continuously exerted on the extended surface during operation for urging the extended surface against the applied layer on the strip, so as to maintain a uniform metering gap between the extended surface and the coated strip surface. The extended surface has a sensor for repetitively determining metering gap. A computer monitors the sensor output and causes load-exerting air cylinders to vary their applied load, in order to urge the coating head toward or away from the back-up roll, so as to reduce difference between the sensed metering gap and a predetermined gap, thus producing a uniform coating film thickness on strip articles having non-uniform surface topography.

REFERENCES:
patent: 4291642 (1981-09-01), Kolc
patent: 4520049 (1985-05-01), Nakanishi
patent: 4675230 (1987-06-01), Innes
patent: 4762578 (1988-08-01), Burgin, Jr. et al.
patent: 4899691 (1990-02-01), Fitzgerald, Jr. et al.

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