The gate of the plastic mold refers to a section of short runner connecting the runner and the strong, which is the entrance of the resin injection cavity. The shape, quantity, size and location of the gate in the mold will have a great impact on the quality of the plastic parts. Therefore, the selection of the gate is one of the key points of the plastic mold design. The gate will be introduced in several aspects below.

1. The main functions of the gate are:

1. After the cavity is full, the melt will first condense at the gate to prevent it from flowing back.
2. Easy to remove gate tailings.
3. For multi-cavity molds, it is used to control the position of weld marks.

2. Gate type

Gates are generally divided into two types: unrestricted gates and restricted gates. Restrictive gates are divided into three series: side gates, point gates and disc ring gates.