Method of operating an air-supplied type coating booth

Abstract

A method of operating an air-supplied type coating booth in which conditioned air supplied from an air supply blower is enforced downwardly to the inside of a tunnel-shaped coating booth and the air in the coating booth is drawn together with paint mists and the likes down to the beneath of a booth floor by way of an air exhaust blower comprises the steps of detecting the flow velocity of air streams flowing into or out of inlet and the exit of the coating booth, applying primary and secondary averaging processings for signals for averaging variations caused by external disturbances fluctuating at relatively shorter and longer periods of time, judging the thus averaged direction and the flow velocity of the air streams at the inlet and the exit, variably controlling the flow rate of exhaust from the exhaust blower in accordance with the direction and the flow velocity. The exhaust blower means are divided into a plurality of blowers and the minute variations in the direction and the flow velocity are controlled excessively by the blowers situated at the inlet and the exit of the coating booth, while remaining exhaust blowers are operated at predetermined flow rate.