Liquid coating spray applicator and method providing...

B - Operations – Transporting – 05 – B

Patent

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B05B 1/12 (2006.01) B05B 12/00 (2006.01) B05B 13/02 (2006.01) B05B 15/08 (2006.01) G05D 3/00 (2006.01) B05B 1/04 (2006.01)

Patent

CA 2288393

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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