The processing of injection molds is a very complex dynamic processing. Each factor in the molding process has an important impact on the molding quality of products. Mold shrinkage is one of the key factors affecting product quality.
v There are many factors that affect the shrinkage of injection molds, such as molding materials (including polymer molecular chain structure, crystallinity, mechanical properties, rheological properties, etc.), product structure (including product thickness, insert structure, etc.), process conditions (including injection Speed, holding pressure, holding time, cooling time, etc.) and mold design (including gate location and number, cooling circuit distribution, etc.) all affect its shrinkage behavior.

Whether it is a crystalline plastic or a non-crystalline plastic product, when the thickness of the product is different, the shrinkage rate of the product is very different. As the thickness of the product increases, the longitudinal shrinkage rate and the transverse shrinkage rate of the product are increasing. Big.

The injection mold gradually slows down as the thickness increases, and the longitudinal shrinkage is slightly smaller than the transverse shrinkage.