Influence of Mould Temperature on Plastic Injection Moulded Parts

There are many factors affecting the cooling of plastic injection moulds, such as the shape of plastic injection moulded part and the parting surface design, the type of cooling medium, temperature, flow rate, geometric parameters and spatial arrangement of the cooling duct, then mould material, melt temperature etc. While, what are the influence of plastic injection mould temperature on plastic injection moulded parts?

1. Low injection mould temperature can reduce the moulding shrinkage of plastic injection moulded parts.
2. The injection mould temperature is uniform, the cooling time is short, and the injection speed is fast, which can reduce the warpage and deformation of plastic injection moulded parts.
3. For crystalline polymers, raising the injection mould temperature can stabilize the dimension of the plastic injection moulded parts, and avoid post-crystallization. But it will lead to the prolongation of the injection moulding cycle and the defects of plastic injection moulded parts.
4. As the crystallinity of the crystalline polymer increases, the stress crack resistance of the plastic decreases, so it is advantageous to lower the injection mould temperature. However, for high-viscosity amorphous polymers, since the endurance cracking resistance is directly related to the internal stress of the plastic injection moulded part, it is advantageous to increase the injection mould temperature and the filling speed and reduce the feeding time.
5. Increase the injection mould temperature can improve the surface quality of plastic injection moulded parts. Injection mould temperature directly affects the filling of plastics, the shaping of plastic injection moulded parts, the plastic injection moulding cycle and the quality of plastic injection moulded parts.

The injection mould temperature depends on the crystallinity of plastic, the size and structure of plastic injection moulded product, the performance requirements, and other process conditions such as melt temperature, injection speed, injection pressure, plastic injection moulding cycle, and the quality of plastic injection moulded parts. For amorphous polymer, the melt solidifies as the temperature decreases after being injected into the mould cavity, but no phase transition occurs. The injection mould temperature mainly affects the viscosity of the melt, that is, the filling rate. Therefore, for amorphous plastics with lower melt viscosity and medium density such as polystyrene, cellulose acetate, etc., adopting a lower injection mould temperature can shorten the cooling time.

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