The production of a mold is a process that must be strictly followed in the process. Here are the five factors that influence the mold:
First, as the crystallinity of the crystalline polymer is increased, the stress cracking resistance of the plastic is reduced, so it is advantageous to reduce the mold temperature. However, for high-viscosity amorphous polymers, as their endurance cracking is directly related to the internal stress of the plastic parts, it is beneficial to increase the mold temperature and filling rate and reduce the feeding time.
Second, for crystalline polymers, increasing the temperature of the mold can make the plastic parts dimensionally stable and avoid post-crystallization phenomena, but it will lead to prolongation of the molding cycle and the defects of brittle plastic parts.
Third, the mold temperature is uniform, the cooling time is short, the injection speed can reduce the warpage of plastic parts.
Fourth, low mold temperature can reduce the molding shrinkage of plastic parts.
Fifth, improving the temperature of the hexagonal hollow slope mold can improve the surface quality of plastic parts. Determination of mold temperature During the injection molding process, the mold temperature directly affects the mold filling of the plastic, the shaping of the plastic parts, the molding cycle, and the quality of the plastic parts. The temperature of the rail cover mold depends on the plastic crystallinity, plastic parts size and structure, performance requirements and other process conditions such as the melt temperature, injection speed, injection pressure and molding cycle. For amorphous polymers, the melt solidifies after it is injected into the mold cavity as the temperature decreases, but no phase transition occurs. The mold temperature mainly affects the viscosity of the melt, ie, the mold filling rate. Therefore, for the lower melt viscosity and medium amorphous plastics such as polystyrene, cellulose acetate, etc., using a lower mold temperature can shorten the cooling time.
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