1) Influence on internal stress of products The interna […]
1) Influence on internal stress of products
The internal stress of the product is formed due to different shrinkage rates during cooling. When the product is formed, its cooling gradually extends from the appearance to the inside. During the cooling process, internal stress is generated due to the difference in the shrinkage speed.
The cooling system of the injection mold quickly cools down the molten plastic material, so that the molded product has a high residual internal stress. Mold temperature is the most basic method to control the internal stress of plastic products. If the temperature of the injection mold is slightly changed, the residual internal stress of the product will be greatly changed.
2) Affect the molding shrinkage of the product
As the temperature of the molten plastic material increases, the shrinkage rate will decrease; while as the temperature of the injection mold increases, the shrinkage rate of plastic products will increase.
3) Impact on the appearance of plastic products
Higher melting temperature can improve the mobility of plastic materials, which usually makes the appearance of the part smooth and shiny, and also improves the strength and surface of the bonding line.
4) Impact on defects of plastic products
If the cooling system of the injection mold is not designed properly or the temperature of the injection mold is not properly controlled, the lack of cooling of the plastic parts will cause the plastic parts to warp and deform.