Four Important Factors Affecting The Quality Of Your Injection Mold

1) Plastic Materials

The complexity of the injection molding process is determined by the complexity of the properties of the plastic material. The varieties, brands, manufacturers and even batches affect the performance of plastic materials and cause variations in it. Different performance parameters can lead to completely different styling results.

2) Injection Temperature

As soon as the melt flows into the cooling cavity, it loses heat because of heat conduction. At the same time, the heat generated by shearing can be more or less than the heat dissipated by heat conduction, mainly depending on the injection conditions . As the temperature increases, the viscosity of the melt decreases . Thus , the higher the injection temperature , the lower the melt viscosity and the smaller the required filling pressure . At the same time, the injection temperature is also limited by the thermal decomposition temperature and the decomposition temperature. .

3) Mold Temperature

The lower the mold temperature, the faster the heat loss due to heat conduction, the lower the melting temperature , and the worse the fluidity. This phenomenon is especially noticeable when the rate of injection is low.

4) Injection Time

The effect of injection time on the injection molding process is manifested in three aspects :

• Shortening the injection time will increase the shear stress ratio in the melt , and the injection pressure required to fill the cavity will also increase.
• Shorten the injection time, increase the shear stress ratio in the melt .Due to the shear thinning property of the plastic melt , the viscosity of the melt is reduced ,and the injection pressure required to fill the cavity is also reduced.
• Shorten the injection time , increase the shear stress ratio in the melt , increase the shear heat , and reduce heat loss due to heat conduction . So the higher the melting temperature and the lower the viscosity, the lower the injection pressure required to fill the cavity. As a result of the above three conditions, the injection pressure curve required to fill the cavity is the “ you ” figure. That is, there is an injection time at which the injection pressure is minimal.

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