Temperature control method in injection plastic mold

Temperature control method in injection plastic mold

The melt temperature can be measured at the nozzle or using the air jet method. The temperature setting of the injection cylinder depends on the melt temperature, screw speed, back pressure, injection volume and injection molding cycle. If you have no experience in processing a specific grade of plastic, start with the lowest setting.

Different plastic products require different injection pressures. Increasing the pressure will significantly improve the fluidity. The injection pressure determines the density of the product, that is, the appearance of gloss.

Melting point is a temperature segment in a molten state. The structure and composition of plastic molecular chains are different, so their influence on fluidity is also different. Rigid molecular chains are significantly affected by temperature, such as PC and PPS, while flexible molecular chains are: The fluidity of PA, PP, PE, etc. is not obvious by changing the temperature, so the reasonable injection temperature should be adjusted according to different materials.

Some plastic materials require high mold temperature due to high crystallization temperature and slow crystallization speed, and some require higher or lower temperature due to size and deformation control or demoulding requirements, such as PC generally require more than 60 degrees. The mold temperature sometimes needs to be above 160 degrees.

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