How to make high quality injection molded parts

Although in the plastic injection mold technology, it is facing great challenges to produce high gloss, high aesthetic requirements, free from the stress generated in the molding process, high stability parts, and reliable filling of thin-walled materials. However, hot / cold forming is being rapidly accepted in automotive interiors and many other consumer products that require high surface aesthetics. Let's take a look at the production process plan of high-quality injection molded parts of high gloss parts;

Change of heating process: Traditionally, the melt of plastic injection molding enters the mold cavity and contacts the coldest surface of the cavity. This immediately produces a frozen surface. This rapid transformation slightly changes the molecular structure of the material, resulting in the loss of natural brightness of some materials. In addition, the material adjacent to the frozen layer cools rapidly and has a high viscosity relative to the hotter core at the front of the molten material, resulting in various types of visible defects.

The principle of hot / cold forming technology is to increase the temperature of the cavity surface of the injection mold before the material enters the cavity, and then cool the cavity after filling the mold.

Prevent the surface of the material from freezing immediately during the filling process, so that the material can maintain its natural brightness. In addition, during the whole filling process, the viscosity of the melt flow is almost uniform, avoiding many common surface defects related to traditional plastic injection molding.