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The injection molding manufacturing process is mainly divided into four stages: filling stage, holding stage, cooling stage and demolding stage.

1. Filling stage: This is the initial stage of the entire injection molding process, and the time is from mold closing to mold cavity filling to about 95%. In theory, the shorter the filling time, the higher the molding efficiency, but the actual situation is affected by many factors such as temperature and material viscosity.

2. Holding stage: In this stage, the injection molding machine continuously applies pressure to compact the melt and increase the density of the plastic to compensate for plastic shrinkage. During the holding process, the cavity is full of plastic, the back pressure is high, the injection molding machine screw can only move forward slowly, and the plastic flow rate is relatively slow. This flow state is called pressure-holding flow, which has an important impact on the injection molding effect.

3. Cooling stage: The cooling stage usually takes a long time, accounting for more than 70% of the entire injection molding process time. In the injection molding industry, the design of the cooling system is crucial, which is directly related to the molding quality of plastic products. Only when the product is cured to a certain rigidity can it avoid deformation due to external forces during the demolding stage.

4. Demolding stage: Injection molding processing pays special attention to the benign coordination of the cooling stage and the demolding stage. Through reasonable structural design, the entire processing process is smoother.

Through a deep understanding of the injection molding process, we can better grasp its technical points and improve product quality.