Abstract
To determine the state of spray nozzle and operational parameters for optimization of coating thickness, a homemade automatic spray paint test device(type of spray gun:WA-101-082P) was used, using polyurethane (PU) wood coatings, with the spraying distance between nozzle and workpiece altered. Also, the nozzle jet direction and angle to the surface of the workpiece were varied along with nozzle operation relative to workpiece speed (Orthogonal experiment L9(34))to 36 block size is 800 mm × 200 mm × 15 mm medium density fiberboard (MDF) test specimen surface spraying process. Then, the surface coating film was measured for film thickness, film surface roughness and performance comparison and a comparative analysis was conducted. Results showed that when the air pressure was 0.28 MPa, the spraying distance was 250 mm, the nozzle angle was 30°, and the running speed was 55 mm·s-1 were optimal conditions for obtaining a thin film thickness and favorable uniformity. With these performance characteristics the coating would perform well.
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