Injection molding is a common method of plastics processing based on the principle that molten plastic is filled with a mold 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 a high-pressure mold through an 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 consists of the following steps:

1. Heating and melting: The plastic pellets are heated to the melting point by passing through the heating cylinder of the injection machine. This results in the formation of a flowable plastic melt that provides the raw material for subsequent injections.

2. Injection: The molten plastic is injected into the mold chamber. The injection machine uses high pressure to push the molten plastic into the mold, ensuring that the mold chamber is completely filled, while maintaining pressure to prevent the plastic from curing before it cools.

3. Cooling and curing: The plastic is cooled in the mold and gradually solidified into the desired shape. The control of the cooling time is essential for product quality to ensure complete curing and prevent possible deformations or defects.

4. Mold opening and discharging: Once the plastic is fully cured, the mold separates and discharges the finished product. This step requires caution to ensure that the product is not compromised.

Injection molding is used in the manufacture of a wide range of plastic products, from everyday items to industrial parts, due to its efficiency, precision and mass production. It not only improves production efficiency, but also enables the manufacture of plastic products with complex structures and precise dimensions.