Injection Molding Process is one of the core technologies in the mold manufacturing industry. It achieves efficient production of complex-shaped plastic products by injecting molten plastic into precision molds and cooling it into shape. The key stages of the process include:
Filling Stage:
Molten plastic rapidly fills the mold cavity under high pressure.
Shear-thinning behavior reduces viscosity and shortens filling time, but speed must be balanced to avoid weld-line defects.
Packing Stage:
Continuous pressure compacts the melt to compensate for cooling shrinkage.
Ensures product density and dimensional accuracy, with pressure reaching 20-45 MPa.
Cooling Stage:
Plastic solidifies via the mold’s cooling system, which accounts for 70%-80% of the cycle time.
Poor cooling design may cause warpage, requiring precise temperature distribution control.
Ejection Stage:
Ejector pins or stripper plates apply uniform force to release the product.
Uneven force distribution risks deformation, necessitating optimized ejection system design.
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