plastic injection molding, five things to pay attention to when injecting two-color plastic shell molds
Color injection molding is a molding technology widely used in industrial production, which makes the product have the characteristics of a variety of colors, materials or textures. When injecting the two-color plastic shell mold, you need to pay attention to the following important matters:
1. It is very important to design the mold structure reasonably. The mold structure should ensure that the two plastic materials can be injected smoothly and can be correctly positioned and bonded together. The flow path and cooling system in each injection molding process should be taken into account, as well as the shrinkage and thickness distribution of plastic parts. Through reasonable mold structure design, defects or deformation can be avoided to the greatest extent.
2. For two-color injection molding, the selection and compatibility of plastic materials are very important. Ensure that the two plastic materials used can be well bonded together and meet the requirements of the product. When choosing materials, it is necessary to consider their performance parameters such as melting index, viscosity, fluidity and shrinkage, as well as their chemical and physical compatibility when they are in contact.
3. The control of injection molding temperature and pressure is also the key. Different plastic materials have different melting temperature and injection molding temperature ranges, and the appropriate injection molding temperature needs to be determined according to the characteristics of the material. In addition, the appropriate injection pressure can ensure that the plastics of the two colors or materials can be fully mixed and bonded together, and the mold cavity can be filled with integrity.
4. We also need to pay attention to the treatment and lubrication of the mold surface. The finish of the mold surface is very important for two-color injection molding. It can be treated by polishing, electroplating or sandblasting to reduce friction and resistance and ensure the quality of the surface of the mold. At the same time, appropriate lubrication of the mold is needed in the injection molding process to reduce friction and wear in the injection molding process.
5. The control of process parameters in the injection molding process is also one of the keys. The reasonable control of parameters such as melting temperature, injection speed and pressure retention time can directly affect the quality of the molded products. By accurately adjusting and optimizing these parameters, defects such as bubbles, heat marks and uneven color can be avoided. In the injection molding process of two-color plastic shell molds, strict compliance with the above five major items can effectively improve production efficiency and product quality, ensure that the final molded product meets the design requirements and meets customer needs.