What is the production process of plastic product injection molding?

What is the production process of plastic product injection molding?

 

Injection molding is a common plastic processing method based on the principle of filling a mold with molten plastic under high pressure to form the shape of the desired product. First, the plastic pellets are heated to the melting point and then injected into the high-pressure mold by the injection machine. The shape of the cavity of the mold matches the final product. Once filled, the plastic cools and solidifies in the mold, eventually forming a plastic product with the desired shape and size.

 

This process mainly includes the following steps:

 

1. **Heating and melting:** The plastic pellets are heated to the melting point by the heating barrel of the injection machine. This will form a flowable plastic melt to provide raw materials for subsequent injection.

 

2. **Injection:** The molten plastic is injected into the mold cavity. The injection machine uses high pressure to push the molten plastic into the mold to ensure that the mold cavity is fully filled, while maintaining pressure to prevent premature solidification before the plastic cools.

 

3. **Cooling and solidification:** The plastic cools in the mold and gradually solidifies into the desired shape. The control of cooling time is critical to product quality to ensure complete solidification and prevent possible deformation or defects.

 

4. **Mold opening and discharge:** Once the plastic is fully solidified, the mold separates and discharges the finished product. This step requires caution to ensure that the product is not damaged.

 

Injection molding has the advantages of high efficiency, precision and large-scale production, so it is widely used to manufacture various plastic products, from daily necessities to industrial parts. It not only improves production efficiency, but also enables the manufacture of plastic products with complex structures and precise dimensions.