Definition
The entire path the plastic travels from the sprue entry to the injection point of the cavity or cavities. Molds can have a cold runner, hot runner, or a combination of both.
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Runner
Design
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Related terms
- CavityDesign
Part of the mold where the plastic piece is formed. It is a hollow structure that has the exact and detailed shape of the part to be manufactured.
- Cold RunnerDesign
In this type of runner, plastic is injected through a cold channel exposed on the face of the mold. It allows for faster cooling, although it increases the projected area.
- GatesDesign
Opening or channel that allows the flow of molten material from the runner into the mold cavity. It controls and regulates the speed and injection pressure of the material.
- Hot RunnerDesign
Hot channel system that keeps the molten material at a constant temperature inside the mold. It consists of a set of heated nozzles that allow the plastic to flow uniformly.
- SprueDesign
Entry part where plastic enters the mold; it makes direct contact with the nozzle tip. It leads into the runner of the mold, which then reaches the gates and cavities.