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Steps and Advantages of Stages of Injection Molding

In a brief overview, injection molding refers to a method in which heated and melted materials are injected into a mold cavity by high pressure, and after cooling and solidification, a molded product is obtained. This method is suitable for mass production of parts with complex shapes and is one of the important processing methods.

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Injection Molding Process

The injection molding process can be roughly divided into the following 4 stages

The stage one

Granular or powdered thermoplastics are fed from the hopper into the injection molding machine.

The stage two

The injection molding machine consists of a hollow steel drum with a rotating screw (chemical screw) inside. The screw carries the plastic along the barrel to the mold.

Heaters around the cylinder will melt the plastic as they travel along the cylinder.

The stage three

As the molten plastic builds up at the end of the barrel, the screw is forced back.

Once enough plastic has been collected, the hydraulic plunger pushes forward on the screw to push the plastic through the runner into the mold cavity.

The mold is heated before injection and the plastic is quickly injected to prevent it from hardening before the mold is filled.

The stage four 

The pressure is maintained for a short time (hold time) to prevent the material from creeping backwards during solidification (hardening). This prevents shrinkage and denting, thus providing a higher quality product.

Cool the mold before removing it from the mold (eject). To mold the shape of a cavity.

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Advantages of Injection Molding

The advantages of injection molding method are fast production speed, high efficiency, operation can be automated, variety of colors, shapes can be from simple to complex, size can be from large to small, and the size of the product is accurate, the product is easy to update, and the shape can be complicated. Parts and injection molding are suitable for mass production and complex shape products.


learn more :

3 Basic Steps of the Injection Molding Process

Major stages of injection molding

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