subject: Strip Coating Machine With Thickness Control [print this page] Continuous strip coating machines have top and bottom applicator rolls and a backup roll adjacent the top applicator roll. A lift roll to lift the strip of material and thus vary the angle of wrap of the strip about the bottom applicator roll is provided. The use of the lift roll in turn varies the pressure between the strip and the roll and thus the thickness of the coating applied to the strip bottom. Thickness may be measured indirectly by measuring pressure of the strip on the applicator roll. Thickness may also be measured directly. Oscillations of the strip in a drying oven may also be sensed and compensated for. Feedback control is used with the thickness measuring techniques to control the coating thickness by varying angle of wrap, relative speed between the applicator roll and strip, and/or nip pressure between the applicator roll and a transfer roll that transfers coating material to the applicator roll.
A continuous strip coating machines as recited in claim 1 wherein the measuring means for determining coating thickness is a sensor selected from the group consisting of a pressure transducer for measuring pressure applied by the strip to the bottom applicator roll, a wet thickness sensor adjacent to the bottom applicator roll, and a proximity sensor adjacent to the strip after it leaves the bottom applicator roll.
A continuous strip coating machines as recited in claim 8 wherein the means for moving the lift roll comprises actuator means for raising and lowering the lift roll and feedback means coupled to the measuring means for receiving a thickness measurement from the measuring means for controlling the actuator means in response to the thickness measurement. our company can supply your favourite mesh belt dryer
by: ericfu
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