Method for automatic film thickness control
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United States of America Patent
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Mar 28, 1995
Issued Date -
N/A
app pub date -
Apr 20, 1994
filing date -
Feb 16, 1990
priority date (Note) -
Expired
status (Latency Note)
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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.
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