The mold makes the injection into the Thermoplastics into the desired product. In order to be able to eject, the product must be able to withstand the jacking force without deformation. Because of this, the temperature of the plastic during ejection must be lower than that for injection, but it does not have to be completely cold. Designers should know that a considerable part of the molding cycle, sometimes 80% of the molding cycle, is used for cooling. Therefore, it is very necessary to control the "lost" time to a small extent for the dies with high productivity requirements. However, there are many other factors that must be considered when designing the mold cooling system.
The factors that affect the cooling of mould in Shandong Province are as follows
① Temperature rise of cooling medium from "inlet" to "outlet";
② From "inlet" to "outlet", flow rate of cooling medium and chemical composition of cooling medium;
③ Thermal conductivity of mold parts;
④ The temperature difference of plastic from injection to ejection;
⑤ Runner system (size, layout);
⑥ Runner type (hot runner or cold runner);
⑦ Cooling pipes in parts in direct contact with molded products (size, layout);
⑧ Size and layout of cooling pipes in formwork;
⑨ Size and quantity of inlet and outlet hose.
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