In the production process of wooden doors, if painting is applied by spraying, it is inevitable that some unavoidable technical defects will be encountered, and what are the causes of these technical defects? What are the corresponding treatment methods?
Hanging
Causes: (1) uneven spray pressure; (2) too close spray distance; (3) unbalanced spray speed and paint output; (4) excessive spray volume; (5) incorrect spray angle; (6) spray The ambient temperature is too low; (7) the nozzle is large, the pressure is large, and the amount of paint is large.
Treatment methods: (1) control spray pressure; (2) distance control at 15-25 cm; (3) adjust spray speed to maintain balance with paint; (4) control spray volume; (5) maintain vertical spray; ) increase the ambient temperature; (7) select the appropriate nozzle and pressure to control the amount of paint
2. Bubble
Causes: (1) the spray system's filter system is faulty; (2) one spray is too thick; (3) the spray gun pressure is too large, the spray distance is too far; (4) the solvent evaporates too fast
Treatment methods: (1) check and repair the filtration system; (2) control the amount of spray; (3) control the spray pressure and distance; (4) add a moderate amount of volatile flux
3. Whitening
Causes: (1) water is mixed into the paint; (2) moisture is mixed into the paint; (3) the wind speed in the spray booth is too large; (4) too low boiling point solvent is added too much
Treatment method: (1) check the oil-water separator; (2) control the relative humidity in the spray booth; (3) control the wind speed at 50-80 cm/s; (4) control the low-boiling solvent addition amount
4. Orange peel
Causes: (1) insufficient spray pressure, poor spray atomization; (2) too long spray distance; (3) too high viscosity of paint, poor atomization of paint liquid; (4) low temperature of paint, leveling Poor planning; (5) spray gun speed is too fast or too slow; (6) nozzle wear, paint liquid atomization is not good; (7) spray gun model selection is not appropriate
Treatment methods: (1) increase the spraying pressure; (2) control the spraying distance; (3) adjust the viscosity of the coating; (4) increase the spraying temperature, improve the leveling; (5) correctly grasp the spraying speed; (6) replace the nozzle (7) Select the appropriate spray gun according to the performance of the paint
5. Granules
Causes: (1) The spray gun moves too fast and the spray is uneven; (2) The spray pressure is too low, the spray is not well atomized; (3) The nozzle has small aperture, the pressure is too large, the spray distance is too far, and the paint does not reach. The surface has been gelled; (4) the amount of spraying is too small, no continuous coating film is formed; (5) the spraying system of the spraying machine fails; (6) the surface of the substrate is dusty, abrasive and wood wool; (7) The spray gun was not cleaned and the paint particles were ejected.
Treatment method: (1) control the speed of the spray gun, preferably 30-50 cm / s; (2) adjust the spray pressure; (3) correctly spray according to the operating procedures; (4) increase the spray volume; (5) check and repair the filter system (6) Thoroughly clean and dedust the surface of the substrate before spraying; (7) Thoroughly clean the spraying equipment after spraying. [ Follow the WeChat public number "Jiuzhengmen window network: jiuzhengmenchuang"; pay attention to courtesy, scan code to send millions of business opportunities! Jiuzhengmen window network exchange group ]
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