The five aspects of the plastic spraying on hardboard process are as follows:
1. Annealing: Annealing is the process of eliminating the stress generated during the molding of plastic parts. Annealing is to avoid the problem of cracking at the stress concentration after painting. The annealing treatment involves heating the plastic molded parts below the heat deformation temperature and holding them for two hours to remove stress.
2. Oil removal: The surface of plastic parts is often covered with oil, sweat, and release agent, which will make the coating adhesion poor and produce cracking, blistering, and peeling. Degreasing should be done before painting. The plastic parts are usually cleaned with gasoline or alcohol, and then chemically degreased. After chemical degreasing, the surface of the workpiece should be thoroughly cleaned with residual lye and finally cleaned with pure water and dried or dried.
3. In addition to electricity and dust: plastic products are insulators, surface resistance is generally around 1013Ω, easy to generate static electricity. After being charged, it is easy to adsorb the fine dust in the air and attached it to the surface. Due to the electrostatic adsorption of dust with the general blowing method to remove very difficult, the use of high-pressure ionized airflow at the same time to remove electricity and dust is more effective.
4. Spraying: plastic coating thickness of 15 ~ 20μm, usually 2 ~ 3 spraying to complete. Spraying after 15 minutes of drying, followed by another spraying. The surface that needs to be bright must also be sprayed with transparent paint. The coated parts do not affect the flame retardant performance.
5. Drying: After coating, it can be dried at room temperature or baked at 60℃ for 30min. The correct plastic coating process can improve product quality and our company has been engaged in plastic spraying processing for many years and has a mature processing technology.
The above content is the plastic spraying process in the hand board process, I hope to deepen your understanding of the hand board process. If you want to know more about the lamp hand board processing, welcome to contact us, we will be happy to serve you.
