Coating process: coating technology air spraying

Core tip: air spraying is a kind of coating method that uses compressed air to spray and atomize the coating from the spray gun, apply it to and atomize it under the driving of air flow, and apply it to the surface of the coated part to form the coating film under the driving of air flow The empty spraying equipment is mainly composed of compressor, oil-water separator, spray gun, air hose and paint delivery tank Air spraying technology 1 Coating atomization The atomized particles of the coating are fine, the atomization effect is good, and the appearance quality of the coating is good The atomization characteristics can be described as follows: d0=（3.6×105/Qi）0.75 Paint knowledge how about Akzo Nobel Powder Coating Recommended introduction: powder coating is a kind of coating with different form from general coating, which is in powder form It is a new type of coating, because of its own advantages and more and more known by people Let's introduce Akzo Nobel Powder coating Akzo Nobel Powder coating is a cost-effective coating solution, which can be applied to different kinds of products After the treatment of static electricity and fire baking, a tough and durable coating surface will be formed, with the least impact on the environment Since the introduction of this technology, powder coating has been able to continue to maintain the Paint Home News: air spraying is a coating method that uses compressed air to spray and atomize the paint from the spray gun, apply it to and atomize it under the driving of the air flow, and apply it to the surface of the coated parts to form a coating film under the driving of the air flow The empty spraying equipment is mainly composed of compressor, oil-water separator, spray gun, air hose and paint delivery tank Air spraying technology 1 The atomizing particles of the coating atomizing coating are fine, the atomizing effect is good, and the appearance quality of the coating is good The atomization characteristics can be described by the following formula: d 0 = (3.6 × 105 / Q I) 0.75, where d0 is the average particle size of paint (μ m); Qi is the ratio of air consumption to paint output When the Q I value is small, the ratio of air consumption to paint output has a great influence on the atomization effect At this time, increasing air consumption or reducing paint output will significantly improve the atomization effect To increase the air volume, it can be achieved by increasing the air pressure, but it should be noted that higher air pressure will make the paint foam more seriously dispersed 2 The amount of paint is determined by the diameter of spray gun The spray gun of 1.5mm caliber can be used for the top coat and 2.5mm caliber can be used for the primer It can be seen that the best way to greatly increase the paint output is to replace the spray gun of larger caliber 3 The influence of spray pressure and air pressure on spray amplitude is not very large, so it can only be adjusted by auxiliary air holes, and according to the size of the workpiece, it can be adjusted to the appropriate range 4 The spray deposition amount of paint mist decreases with the increase of spraying distance The spraying distance is too far, the coating film is thin and rough, and the spraying is too close, and the coating is thick without hanging Generally, the spray distance of small spray gun is 15-25cm, and that of large spray gun is 20-30cm 5 Uniformity of film thickness the uniformity of film thickness is related to the moving speed of spray gun and pattern lapping The spray gun shall move at a constant speed of 30-60cm / s on the surface of the workpiece Too fast will cause bottom exposure, too slow will cause flow hanging, and it will cause serious flow hanging when pausing for 0.1s Advantages and disadvantages of air spraying: the advantages are simple operation, high coating efficiency and good coating quality; the disadvantages are large consumption of coating film, serious environmental pollution and damage to the health of operators, so environmental protection facilities need to be added Scope of application: it is applicable to the coating of various materials, shapes and sizes of workpieces, such as machinery, chemicals, ships, vehicles, electrical appliances, instruments, toys, paper, clocks, musical instruments, etc Home of coatings is specialized in coatings, diatom mud, paint coating, coating technology, fire retardant coating news and coating, diatom mud, paint coating, coating technology, fire retardant coating decoration knowledge and decoration renderings,