What are the factors that affect the cooling of precision injection molds?

Category： Industry information

Release time：2023-02-20

There are many factors that affect the cooling of precision injection molds, such as the shape and parting surface design of plastic parts, the variety, temperature, flow rate of cooling medium, the geometric parameters and spatial arrangement of cooling channels, melt temperature, the ejection temperature and mold temperature of plastic parts, the thermal cycle interaction between plastic parts and molds, etc.

Low precision injection mold temperature can reduce the molding shrinkage of plastic parts, mold

temperature average, short cooling time, fast injection speed can reduce the warpage deformation of plastic parts, about crystalline polymers, advanced mold temperature can make plastic parts dimensional stability, prevent post-crystallization phenomenon, but will lead to extended molding cycle and plastic parts brittleness defects.

As the crystallinity of crystalline polymers advances, the stress cracking resistance of plastics decreases, so it is advantageous to reduce the temperature of precision injection molds. However, for amorphous polymers with high viscosity, due to their endurance cracking properties are directly related to the internal stress of plastic parts, it is beneficial to reduce the temperature and filling speed of precision injection molds, which is beneficial to reduce the feeding time.

Reducing the temperature of precision injection molds can improve the appearance quality of plastic parts. The mold temperature directly affects the filling of plastics, the shaping of plastic parts, the molding cycle and the quality of plastic parts, and the mold temperature depends on the crystallinity of plastics, the size and structure of plastic parts, performance requirements and other process conditions such as melt temperature, injection speed, injection pressure and molding cycle.

keyword： What are the factors that affect the cooling of precision injection molds?

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