company news about Curing process of spraying equipment

Curing of spraying equipment is a key process in the process of spraying operation, which has a great impact on the physical and chemical properties of the coating film, and the curing process requirements must be strictly implemented. Curing process conditions of the first spray equipment. Each powder coating has corresponding technical indicators and curing process requirements. The process refers to the temperature and time at which the powder coating film is baked in the oven. The curing time requirements of the spraying equipment are very strict, and it must be the calculation time after the temperature of the workpiece coating film reaches the curing temperature, and this period of time must be insulated according to the regulations. It is important to control the curing time. The time is too short, the curing is not complete, the film forming property is poor, especially the mechanical property is poor; If the time is too long, it may cause thermal aging, color difference of the coating film, and physical properties will also cause changes.

2, electrostatic spray gun (1, classification: spray gun according to the use can be divided into portable powder spray gun, fixed automatic powder spray gun, pan spray gun, etc.; The forms can be divided into conflict guns, rebound guns, secondary air inlet guns, centrifugal cup guns and so on. (2) Spraying efficiency: The charged mechanism of the powder spray gun is a key factor to improve spraying efficiency. In general, the core of the dusting equipment is the spray gun and the charging system. As far as the current market is concerned, the proportion of corona spray guns is very large, because the biggest advantage of high-voltage corona discharge charging powder is that it can spray various thermosetting powder coatings today. Powder spraying equipment, and can get very good results. Its main advantages are excellent stability, powder yield and powder speed. (3) The development process of the spray gun is as follows: voltage control o current control o total energy control. The total energy control is to continuously adjust the voltage and current to the ideal state with the distance between the spray gun and the workpiece to achieve the best spray effect. 3. Powder supply system

The second requirement for ovens or drying channels. The oven or oven is equipped with heat preservation and hot air circulation device, which can make the temperature uniform in the entire oven or oven. When the workpiece is placed in the oven, there must be enough pores between the workpiece and the workpiece to ensure the circulation of hot air, so as to prevent the coating film from producing that the upper half has been cured completely and the lower half is in a "secondary" state, or the lower half has been completely cured and the upper half has been "too hot". Because the temperature of the upper part of the oven or baking path is always higher than that of the lower part, the above drawbacks can be overcome only after the hot air circulation device is equipped.

Third cooling. The workpiece needs to be cooled after curing. Cooling methods include air cooling, water cooling and oil cooling. In the production, the corresponding cooling method should be selected according to the powder varieties and different specifications of the workpiece. Some workpieces are cooled naturally after being taken out of the oven or cooled with the furnace, this cooling method is called air cooling; The way in which the workpiece is cooled in water or oil immediately after it is taken out of the oven is called water cooling or oil cooling. There are also some powder varieties after film cooling speed should not be too fast, such as sharp cooling, the edge of the film will shrink and deform, affecting the overall appearance and quality of the film. Fourth post-processing. Post-treatment refers to the finishing, repairing and post-heat treatment of the coating film after curing of the spray equipment. Finishing refers to removing the covering material, trimming the workpiece, removing the screws, fixtures, and stripping away the covering protective layer. Resist abrasion and damage to the film at this time. Repair generally refers to the repair method that can be used to repair the damaged coating film within the permissible range after the coating film is damaged in the painting construction. In principle, it should be resprayed; The place that needs to be resprayed is polished with sandpaper, re-sprayed with electrostatic spray gun, and then cured in the oven.