1. The influence of coating environment temperature and temperature on the thickness of the coating film: take the powder spraying amount of 170-200g/min, the voltage of 70KV, and the distance between the spray gun and the object to be coated 20cm as an example, when the temperature is 20-30 ℃, the humidity At 60-80%, the coating efficiency of powder coatings is better, and the coating film is thicker.
2. Distribution of coating film thickness: In powder mechanical coating, due to the unevenness of the sprayed powder, the unevenness of the coating film thickness is about twice that of solvent coating. It is necessary to correctly grasp the effective spray pattern of the equipment, Control the indirect time of spraying to prevent uneven spraying.
3. The smoothness of the coating film: In the equipment, the thicker the coating film thickness, the smoother the surface. The main factors affecting the smoothness of the powder coating film are the particle size and its distribution, melt viscosity, and the dispersion state of pigments and curing agents.
4. Particles of the coating film: The fine particles in the powder coating are easy to accumulate in the head of the spray gun or the part where the airflow direction changes in the pipeline after the equipment. In the construction of electrostatic spraying, the problem of environmental dust should also be paid enough attention.
5. Coating efficiency: The main factors affecting the coating efficiency of powder coatings are the charging method of the equipment to the coating, the particle size distribution of the powder, the temperature and humidity of the coating environment, etc.
