Plastic injection machines are fully suitable for manufacturing mobile phone cases, which is currently the mainstream manufacturing method in the industry. The following is a specific analysis:
1. Process adaptability
Plastic injection machines melt plastic raw materials (such as polycarbonate, ABS, and other engineering plastics) at high temperatures, and then inject liquid plastic into precision molds for molding. The structure of mobile phone casings is usually thin and complex in shape, and injection molding technology can accurately replicate mold details (such as openings and textures) to meet high-precision requirements. For example, the patent mentions that polycarbonate material can form wear-resistant and high-strength shells through injection molding, and different designs can be achieved by adjusting the mold.
2. Manufacturing process
Raw material processing: Dry the granular plastic raw materials and mix them with color masterbatch to ensure color uniformity.
Melt injection: The material is heated to a molten state in the barrel of the injection machine and injected into the closed mold cavity under high pressure. The patent shows that some processes require controlling the melt temperature within the range of 200-300 ℃ to ensure fluidity.
Cooling and shaping: The mold is equipped with a built-in cooling system (such as water pipe circulation) to accelerate plastic solidification and shorten the cycle (usually ranging from 10-60 seconds).
Post demolding treatment: After demolding, the outer shell needs to remove burrs (such as capes), and some parts also need to be polished or sprayed to enhance the surface texture.
3. Efficiency and cost advantages
Mass production capability: Short single injection molding cycle, capable of continuous production, suitable for millions of orders. For example, the lifespan of a set of molds can reach hundreds of thousands of times.
Cost controllable: High utilization rate of raw materials (recyclable waste), and automated production reduces reliance on manual labor. The patent mentions that compared to metal shells, the cost of plastic injection molding is reduced by about 30%.
4. Quality control
Defects (such as shrinkage and bubbles) may occur during the injection molding process, and it is necessary to cooperate with a sorting device for inspection:
Automated sorting: By using camera equipment to capture the surface of the shell from multiple angles, defects are identified and classified for transportation to the rework or scrap area.
Real time monitoring: Sensors monitor injection pressure and temperature parameters, adjust processes in a timely manner to reduce defect rates.