Five things to pay attention to when injecting two-color plastic shell molds in injection molding factories
Date: September 18, 2024
Double color plastic shell mold injection molding is a widely used molding technology in industrial production, which gives products the characteristics of multiple colors, materials, or textures. When injecting two-color plastic shell molds, it is important to pay attention to the following:
1. Reasonable design of mold structure is very important.
The mold structure should ensure that the two plastic materials can be smoothly injected and correctly positioned and bonded together. Consider the flow path and cooling system during each injection molding process, as well as factors such as the shrinkage rate and thickness distribution of the plastic parts. By designing a reasonable mold structure, defects or deformations can be minimized to the greatest extent possible.
For two-color injection molding, the selection and compatibility of plastic materials are very important.
Ensure that the two plastic materials used can bond well together and meet the requirements of the product. When selecting materials, it is necessary to consider their performance parameters such as melt index, viscosity, flowability, and shrinkage rate, as well as their chemical and physical compatibility when in contact.
3. The control of injection molding temperature and pressure is also crucial.
Different plastic materials have different melting temperatures and injection molding temperature ranges, and the appropriate injection molding temperature needs to be determined based on the characteristics of the material. In addition, appropriate injection pressure can ensure that two colors or materials of plastic can be fully mixed and bonded together, and can fill the mold cavity completely.
4. Attention should also be paid to the surface treatment and lubrication of the mold. The smoothness of the mold surface is crucial for two-color injection molding,
Polishing, electroplating, or sandblasting can be used for treatment to reduce friction and resistance, ensuring the quality of the formed product surface. At the same time, it is necessary to provide appropriate lubrication to the mold in a timely manner during the injection molding process to reduce friction and wear during the injection molding process.
5. The control of process parameters during injection molding is also one of the key factors.
Reasonable control of parameters such as melting temperature, injection speed, and holding time can directly affect the quality of the molded product. By accurately adjusting and optimizing these parameters, defects such as bubbles, heat marks, and uneven color can be avoided. Strictly following the above five items during the injection molding process of two-color plastic shell molds will help produce high-quality and aesthetically pleasing two-color plastic products, meet market demand, and enhance enterprise competitiveness.