1. Miniaturization and lightweight, improve performance (asphericalization, insulation, impact resistance, etc.) of the lens, improve the degree of freedom of appearance (color, shape and surface state), improve operability, and have good touch when people touch;
2. Functionality (versatility and accuracy of components, noise prevention and improved integrity), etc.
For example, engineering plastics are mainly used in the shells of cameras and video cameras to replace metal, reduce the number of parts and processing jobs, and realize compounding. PC is widely used. It is mainly used as external parts such as upper cover, lower cover and bottom cover. It is bright in color and beautiful. In addition, it is impact resistant and static pressure resistant. It can also be used for surface coating. The processing process is simple and feasible. In order to ensure the assembly accuracy, modified PPO and enhanced PC have been used to replace the aluminum plate used in the camera. Gf-pc plastic is used for AF camera, and POM is used for additional equipment tripod of camera to reduce weight. There is also a need for corrosion-resistant materials for printing and enlarging machines. PPO plastic is now used, which has not only acid and alkali resistance, but also dimensional stability and sliding resistance. PPS plastic can be used in the plate, shell, box and other parts of the clock if high strength and precision are required. Various gear parts can be made of fr-pa and fr-pom plastics. The plastic parts of watches are mainly POM, which is required to have fatigue resistance, sliding resistance, rigidity, oil resistance, dimensional stability, etc. The shell is made of PVC alloy. Now watches with high surface accuracy, acid and alkali resistance, good rigidity and light weight are very popular.
