Cold runner: refers to the part between the mold entrance and the product gate. The plastic is kept flowing in the runner by the injection pressure and its own heat. The runner is part of the molding material, but it is not a product. Hot runner: As a common component of the injection mold system, heating is used to ensure that the plastic in the runner and gate remains molten. Since there is a heating rod and a heating ring near or in the center of the runner, the entire runner from the nozzle exit of the injection molding machine to the gate is in a high temperature state, so that the plastic in the runner is kept molten. Generally, there is no need to open the runner to take out the condensate after shutting down. When the machine is turned on, it is only necessary to heat the runner to the required temperature. Therefore, the hot runner process is sometimes referred to as a thermal header system, or as runnerless molding.
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Link to this article：Description of injection mold hot runner
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