The characteristics of the powder spraying process of metal products such as safes and gun safes

The characteristics of the powder spraying process of metal products such as safes and gun safes

1. The powder coating does not contain any solvents and is a 100% solid coating. It’s manufacturing, transportation, storage, and construction solve the pollution problem caused by solvents, improve the working conditions of the operators, and benefit the health of the operators. healthy.

2. Simplify the coating process. The powder spraying process only needs 3 steps of powder spraying, solidification, and cooling to form a film at one time. The painting process is greatly simplified, the production cycle is shortened, and the product can be produced on the same day. In the electrostatic coating of powder coatings, automatic coating machinery and recycling systems can be configured to form automated production, thereby saving energy and resources and improving production efficiency.

3. The powder coating has a high utilization rate. The powder coating can be directly applied to the surface of the object to be coated, and the coating film is formed after baking and curing. Moreover, the uncoated powder can be recycled and sent to the power supply system for use. The utilization rate is above 95%.

4. The powder coating film has good performance, sturdiness, and durability. The powder coating can use resins that are insoluble in solvents at room temperature, or polymer resins that are not easily soluble and cannot be liquefied to prepare high-performance coatings with various functions. In addition, when the powder coating is prepared or formed into a film, no solvent is added or released, and no pinholes penetrating the coating film are generated, so the coating film is denser.

5. It can be used to apply powder paint at one time, and a 50-300μm thick film can be obtained in one application, and it is not easy to cause dripping or stagnation (oil accumulation) when the paint is thickly applied, and no solvent pinholes occur. Causes the defects of thick film coating, and the corner coverage is also very high. However, the film thickness of paint is generally 5-20μm at one time. If you want to obtain a thick film or a medium-to-high-grade coating film, you must go through multiple coatings to achieve it.

6. Difficult to change color and long cycle. Because powder coating color cannot be adjusted on-site with primary colors like paint, the color of powder coating has been determined at the factory. If you want to change its color, you need to change the powder coating formula, so it is difficult to complete the adjustment in a short time. Colorwork. Due to the electrostatic spraying, if the color is changed during the operation, the spray gun, powder feeder, powder spray room, powder pipe, recovery system, etc. must all be cleaned up, otherwise, the surface quality of the coating film will be seriously affected. In particular, the conversion of dark and light colors is more complicated, so it is not easy to change multiple tones in a short time.

7. It is not easy to realize coating thinning. Due to the principle of electrostatic spraying, the film thickness of powder coatings is generally above 50μm. Even if the powder coating is excellent and the construction conditions are good, the minimum film thickness is about 40μm. Coating films below 40 μm are currently very difficult.

8. The appearance and flatness of the coating film are slightly poor. Because the powder coating is melted and leveled on the coated object by heating, its melt viscosity is high, and it is easy to be slightly orange peel, and the flatness of the coating film is not as good as paint.

9. There are certain limitations. The limitations of the powder spraying process are mainly manifested in three aspects: First, because the curing temperature of powder coatings is generally above 160 ℃, this limits its use in some products that are not heat-resistant (such as plastics) Secondly, because most of the plastic spraying process uses electrostatic spraying, the object to be coated must be conductive, which requires that the object to be coated must be a metal part, and if it is a non-metal part, the surface must be conductively treated and can withstand 160°C Above the temperature.