The previous articles introduced the thermoforming process, after reading them, I believe you have an understanding of this process. But this time I will introduce the spray paint process. Spray paint is a surface treatment that covers products and semi-finished products. Spray paint has a certain protective effect on plastic products. In addition, plastic products after spray paint will be brighter and better looking, and are more wear-resistant, scratch-resistant, Comfortable hand feel and good chemical resistance. This is why many plastic products have to be sprayed. Next, let me introduce more detailed about plastic spray paint, such as spraying process, the way of painting and what materials can be painted.
Plastic painting process-
1.Eliminate internal stress
Plastic products are easy to form internal stress during vacuum forming molding, and internal force is likely to cause cracks in plastic parts during painting. We can use annealing treatment or whole surface treatment to eliminate stress.
2. Remove residual stains
The surface of plastic parts is often stained with oil and hand sweat, which will reduce the adhesion of paint raw materials and cause cracks, blisters and peeling of the coating. Before painting, we should clean the plastic parts with gasoline or alcohol.
3.High-pressure ion air to remove electricity and dust
Plastic parts are insulators, which creates static electricity easily. After being charged, it is easy to absorb the fine dust in the air and adhere to the surface. We use high-pressure ionized air flow to remove electricity and dust.
4.Spraying
The thickness of the plastic coating is 15-20μm, and it usually takes 2 to 3 sprays to complete. After one spray, let it dry for 15 minutes, and then carry out the second spray.
5.Drying
After coating, it can be self-dried at room temperature or baked at 60℃ for 30minAfter coating, it can dry at room temperature or bake at 60 ℃ for 30 minutes.
Screen printing-
Screen printing consists of five major elements, screen printing plate, squeegee, ink, printing table and substrate. the pattern drawing of the screen printing plate can pass ink, and the non-pattern part of the screen printing plate cannot pass the ink, so that the logo or pattern is formed by printing. When printing, pour ink on one end of the screen printing plate, and press the ink on the screen printing plate with a squeegee while moving at a constant speed toward the other end of the screen printing plate. The ink is moved by the squeegee from the pattern drawing of the screen and finally onto the substrate.
Water transfer printing-
We printed the specially processed polymer film with the texture and placed it flat on the transfer machine. Using the principle of water pressure, the color texture was uniformly transferred to the surface of the product. After cleaning and drying, the protective paint showed a new vision effect.
Can or can not be painted plastic materials-
The materials can be painted- PVC、ABS、PS、HIPS、PET
The materials can not be painted- HDPE、PP
Dongguan Ditai Plastic Company -( http://www.dgdtxs.com.cn)
have been engaged in the thermoforming industry for more than 11 years, and we have painted over 8,000kinds of products.
If you have a project related to thermoforming process, you can contact me at any time, I believe we can give the most professional opinions and plans to realize your wild ideas :).
My email is dgdtxs@dgdtxs.com.cn
Looking forward to your email! !
Thanks !!
