PLASTIC INJECTION MOULD TOOL
The mould tool is the key component in the injection moulding of plastic:
- It provides a passageway for molten plastic to travel from the injection cylinder (barrel) to the mould cavity.
- It allows the air which would be trapped inside when the mould closes to escape. If the air could not escape (be vented) then the moulded component would contain voids (air bubbles) and have a poor surface finish.
- It cools the moulding until it sets. The temperature of the mould is controlled because it is important that the moulding cools at the correct rate to avoid distortion and stress. In most systems water circulates through channels drilled through the mould, similar to a car engine cooling system.
- By means of ejectors the finished moulding is pushed from the mould.