| 摘要 |
PURPOSE:To obtain the stable thickness of a varnish film by automatic control of the rotation number of a feed roller and the ratio of varnish to water, by a method wherein the thickness of varnish film and the thickness of a water film are detected with infrared rays and the supply amounts of varnish and water are controlled by using the detected values thereof in the form of film thickness control signals. CONSTITUTION:The infrared rays from an infrared emitter 10 are projected onto the varnish and water 14 on a roller 17 and its reflection is converted to an electric signal with a photoelectric element 15 to be conducted to an A/D converter 19. Further, the thickness of varnish film and the thickness of water film are calculated with a calculator 20 as well as respective rotation signals of a roller 17 and an interference filter 12. As for control of the varnish film, the amount of varnish is fed by driving the root roller in the varnish pan and as for control of the concentration of varnish, the amount of water is fed by driving a pump. Then, the deviations from the target value of varnish film thickness and the target concentration of varnish are minimized. Thereby, the variations of the film thickness and concentration of varnish following the variations of mechanical speed, temperature, and humidity are controlled at small ones and the stable high-quality coat can be obtained.
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