Automatic coating weight controls for automatic coating processe

Details Automatic coating weight controls for automatic coating processe Automatic coating weight controls for automatic coating processe

1974-07-29

1979-01-16

Esposito, Michael F.

Coating processes

Measuring, testing, or indicating

Thickness or uniformity of thickness determined

427 8, 427 9, 427348, 118 8, 73150R, G01B 1908

Patent

active

041350065

ABSTRACT:
A digital computer is connected to various sensors and devices on a strip line, including a gauge located downstream of a coating bath for measuring coating thickness on the strip. The computer examines the coating weight data obtained from the measuring gauge and determines: (1) the average coating weight on each side of the strip; (2) the total average coating weight on both sides of the strip; (3) the coating weight at the conventional ASTM weigh-strip-weigh test locations on the strip; and (4) the minimum spot total coating on both sides of the strip. The computer then compares these data with target (set point) data entered by the operator and makes the following corrective adjustments: (1) a pressure correction factor is adjusted if either the total coating or the minimum spot coating does not meet required specifications; and (2) air knife position is adjusted if necessary to balance the coating from edge to edge and from side to side.

REFERENCES:
patent: 3709192 (1973-01-01), Anderson et al.
patent: 3808033 (1974-04-01), Mayhew
patent: 3843434 (1974-10-01), Heiks
patent: 3844870 (1974-10-01), Donoghue

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