It is a cavity at the end of the main channel to capture the cold material generated between the two injections at the end of the nozzle to prevent blockage of the runner or gate. If cold material Once mixed into the cavity, internal stress is easily generated in the manufactured article. The cold pocket has a diameter of about 8-10 mm and a depth of 6 mm. In order to facilitate demolding, the bottom is often supported by a stripper Bear.

The gating system refers to the part of the flow path before the plastic enters the cavity from the nozzle, including the main channel, the cold material hole, the shunt channel and the gate. The gating system, also known as the runner system, is a set of feed channels that direct the plastic melt from the injector nozzle to the cavity, typically consisting of a main flow path, a split runner, a gate, and a cold feed pocket. It is directly related to the molding quality and production efficiency of plastic products.

It is the channel connecting the main channel and each cavity in the multi-slot die. In order for the melt to fill the cavities at equal speed, the arrangement of the runners on the mold should be symmetric and equidistant.