THE INJECTION MOULDING PROCESS
The injection moulding process uses a granular plastic which is gravity fed from a hopper. A screw-type ram forces the material into a heated chamber, called a barrel, where it is melted. The ram continues to advance, pushing the molten polymer through a nozzle at the end of the barrel that is pressed against the mould.
The plastic enters the mould cavity through a gate and runner system. After the cavity is filled, a holding pressure is maintained to compensate for material shrinkage as it cools. At the same time, the screw turns so that the next shot is moved into a ready position, and the barrel retracts as the next shot is heated. Because the mould is kept cold, the plastic solidifies soon after the mould is filled.
Once the part inside the mould cools completely, the mould opens, and the part is ejected. The next injection moulding cycle starts the moment the mould closes and the polymer is injected into the mould cavity.
(See Video Below)
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