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 runner 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 nozzle of the injector to the cavity, typically consisting of a main flow channel, a runner, a gate, and a cold pocket. It is directly related to the molding quality and production efficiency of plastic products.
It is a section of the mold that connects the nozzle of the injection molding machine to the runner or cavity. The top of the main flow channel is concave for engagement with the nozzle. The main channel inlet diameter should be slightly larger than the nozzle diameter (0.8mm) to avoid spiking and prevent the two from being blocked due to inaccurate convergence. The diameter of the inlet depends on the size of the product, usually 4-8mm. The diameter of the main flow path should be enlarged inwards at an angle of 3° to 5° to facilitate the stripping of runners.