Press components.
Hopper. Barrel.
Machine basics.
Injection molding machine components reference. Hopper, barrel, screw, mold clamp, ejector. Understanding machine helps design.
Key principles.
Material feed
Holds plastic pellets. Drying for hygroscopic materials.
Melt + inject
Heated barrel melts plastic. Reciprocating screw injects.
Gate to mold
Connects barrel to mold. Hot or cold runner.
Mold halves
Closes mold during injection. Clamp force = projected area × pressure.
Part removal
Pushes part out of mold after cooling.
Mold temperature
Cooling channels in mold. Critical for cycle time.
FAQ
Clamp tonnage selection?
Tonnage = projected area × cavity pressure. Typical 30-100 tons for small parts. 1000+ tons for large.
Screw vs barrel?
Screw rotates and slides forward. Barrel heats material. Both maintain melt temperature.
Hot vs cold runner?
Hot runner: faster cycle, less waste, $5-20K tool premium. Cold runner: cheaper, slower, runner waste.
Cooling cycle time?
Cooling 50-80% of cycle time. Conformal cooling channels reduce significantly.
Mold release agent?
Spray-on release for difficult parts. Periodically as needed. Permanent coatings premium.
Machine sizing?
Match machine to part. Too small: not enough force. Too big: wastes capacity.
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