Introduction to Injection Compression Molding Process

Dec 16, 2021

Injection Compression Molding Process

Injection compression moulding, an advanced form of traditional injection molding, is gradually being used in the production of automotive interior parts;

Advantages of injection compression molding:
1. It can inject parts with a wall thickness of less than 2mm, so the weight of the part can be reduced by 20%.
2. A larger flow length ratio can be designed, so a smaller clamping force and injection pressure can be used to reduce the risk of internal stress and deformation of the parts and the risk of tiger skin patterns. At the same time, there is no need to design more gates and reduce welding. The possibility of traces ensures the dimensional stability and aesthetic appearance of the parts.
3. Lower cycle time, improve production efficiency and save cost.

Disadvantages of injection compression molding:
1. Need to purchase special injection molding equipment.
2. Need to develop special moulds.
3. Only suitable for parts with relatively flat appearance, not suitable for parts with complicated structure.

Basic process principle of injection compression molding:
1. The mold is first closed to a special fixed gap range, not completely closed, and the melt is injected into the cavity with the gap.
2. The mold is further closed at a specific speed and pressure, the melt is compressed, and the resin is filled into every corner of the cavity.
3. When all strokes are compressed, the mold is completely closed, cooling begins, and a holding pressure is applied to the resin.

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