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What is The Best Technique For Paint Plastic Products 

What is the best technique for painting injection molding products?

In high-end injection molded products such as mobile phone casings and car interiors, paint technology is the core link to enhance the appearance value. Mastering these 5 key techniques can reduce the defect rate of your paint injection molded products by over 40%.

1.Surface treatment: lay a solid foundation for paint

The residual release agent and oil stains on the surface of injection molded parts can directly cause the coating to peel off. A certain household appliance company has improved the adhesion of coatings from 2B level to 5B level through plasma treatment technology. It is recommended to adopt the combination process of "flame treatment+electrostatic precipitator", and the surface tension after treatment should reach 40mN/m or more.

2.Process parameters: golden ratio of temperature and humidity

The temperature and humidity control of the spray booth is crucial. Experimental data shows that for every 5 ℃ increase in temperature, the leveling performance of the coating improves by 15%; When the humidity exceeds 70%, the probability of the paint film turning white increases threefold. It is recommended to set the temperature to 22 ± 2 ℃ and the humidity to 50 ± 5%, and equip it with an automatic temperature and humidity control system.

3.Coating selection: balance between performance and cost

Choose the type of coating based on the product usage scenario: Automotive exterior parts should use two-component polyurethane coatings with weather resistance>5000 hours, while ordinary daily necessities can use acrylic coatings with a 30% lower cost. A certain mobile phone manufacturer optimized the color paste ratio through spectral analysis, and the color difference Δ E decreased from 1.2 to 0.6. 4. paint thickness: precision control of 0.01mm

The ideal coating thickness should be 15-25 μ m. Being too thin can lead to insufficient coverage, while being too thick can easily cause orange peel phenomenon. A precision mold factory uses laser thickness gauges for real-time monitoring, which improves the uniformity of thickness to ± 1.5 μ m and reduces the defect rate to 0.3%.

4.Post processing technology: the finishing touch of the dragon painting

UV curing can increase the hardness of the coating to over 3H, and it is recommended to use an energy density of 80-120mJ/cm ². After being treated with nano ceramics, the wear resistance of a certain medical device shell is increased by 5 times, and the service life is extended to 8 years.

Industry case: A certain automotive parts company has increased the spray coating qualification rate of dashboard shells from 78% to 95% by implementing the above techniques, and the annual production capacity of a single set of molds has increased by 120000 pieces. Mr. Wang, the technical director, said, "Spraying is not just about coloring, but a combination of material science and process control

The quality of spray injection molded products depends on the precise control of each stage. It is recommended to regularly perform preventive maintenance on the spraying line, such as replacing the atomizing nozzle every 500 hours, which can reduce 40% of spraying defects.