Automotive paint spraying method
1. General quality spray methodWhen spraying quick-drying topcoats such as nitro or perchloroethylene in ordinary quality, such as military cars, spraying in two parts is usually sufficient.
For example, when spraying nitro topcoat, use external nitro semi-gloss, full-gloss or matt magnetic lacquer. According to the requirements, when spraying for the first time, each side can be sprayed continuously for 3-4 passes. When spraying, the latter shot can press one-half or three-fifths of the film area of the previous shot. One spray, then spray one in a row, spray twice in a row. For three sprays, spray one alternately horizontally and vertically first, and then apply a detailed spray by overlapping the pressure guns (that is, pressing the rear gun more area). During the second spraying, two methods can be used. One method is to spray two consecutively along the object surface in a vertical and detailed manner; the other method is to spray one each horizontally and vertically alternately as long as there is no flowing paint or falling. , Leak spray, exposed bottom and obvious orange streaks, etc., have met the requirements of ordinary quality.
的移动速度也应适当快些，以防产生流漆而造成返工。 When spraying a vinyl chloride topcoat, because the drying speed of vinyl chloride paint is slower than that of nitro paint, the spraying interval should be appropriately far (compared to spraying nitro paint), and the moving speed of the should also be appropriately fast. To prevent rework caused by flow paint. Spraying method is the same as nitro paint.
2. High quality spraying methodThe high-quality spraying method mainly refers to automotive coatings that require polishing after the topcoat is sprayed. ）。 When spraying with a nitro topcoat, because the paint contains a large amount of solvent, the solid content is low (a large amount of solvent is volatilized), the drying is fast, and the paint film is thin. Generally, it should be sprayed 3-4 times or 5-6 times before spraying. It is easy to make the paint film to a coating thickness suitable for polishing, otherwise it is easy to wear through the paint film during polishing and cause rework ( ).
Therefore, when spraying the nitro topcoat, the first few sprays must be sprayed continuously and horizontally 3-4 times alternately, and after the paint film reaches a certain thickness, two or three consecutive fine sprays are overlapped in a row. After drying for 24 hours, you can polish it with a dragon. When spraying quick-drying paints such as vinyl chloride topcoat or acrylic topcoat, the number of sprays can be appropriately reduced according to the solid content of the paint.
3.The vertical and horizontal spraying method is mainly suitable for nitro quick-drying topcoats. It can also be used for spraying perchloroethylene and acrylic topcoats, but it is not suitable for spraying self-drying alkyd or drying topcoats to prevent spraying. Flow caused rework. alternating vertical and horizontal spraying
When spraying nitro topcoat, choose a dry and clean construction site and windless weather. Do not apply on rainy days to prevent the paint film from absorbing moisture and causing whitening. 防潮剂，可预防漆膜泛白。 If construction is necessary due to time constraints, 10% to 15% of moisture-proofing agent can be added to the paint according to the amount of thinner to prevent whitening of the paint film.
When spraying the ordinary car nitro topcoat, for the problems such as drips and sagging caused by the previous spraying, it should be smoothed with an old emery cloth No. 120 or a new emery cloth No. 150, and the floating foam should be cleaned before proceeding. Next spray.
硝基面漆时，每一次喷涂结束后，要进行一次全面检查，如有不良现象，要及时进行处理，确保每次的喷涂质量达到优良。 When spraying nitro topcoats, a comprehensive inspection should be performed after each spraying. If there are any unfavorable phenomena, they should be treated in time to ensure that the quality of each spraying is excellent.
For each side of the car body, spray the lower part of each side (the side facing the ground) before spraying, and then spray the sides of the body to prevent the ground from blowing when the side of the car is sprayed Dust particles and soil the large surface.
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