Liquid coating spray applicator and method providing automatic spread rate control
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United States of America Patent
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Feb 20, 2001
Grant Date -
N/A
app pub date -
Oct 30, 1998
filing date -
Oct 30, 1998
priority date (Note) -
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Abstract
A spray application apparatus and method, well suited for use in a plywood production resin spray line, provides automatic control of the spread rate of resin applied to the veneer layers built-up to form plywood panels. In lieu of the conventional trial and error method of manually adjusting the height of a spray nozzle to adjust the spread rate, a controller, actuator, and various sensors are utilized in conjunction with a novel control algorithm to achieve continuous automatic spread rate control. The control effectively compensates for variations in process parameters (e.g., resin flow rate, conveyor line speed and veneer temperature) during a production run, whereby product quality is increased with reduced resin consumption. The controller is easily and effectively calibrated without the need to obtain accurate initial values of the variable process parameters.
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