Press components. Hopper. Barrel. Machine basics.
Injection molding machine components reference. Hopper, barrel, screw, mold clamp, ejector. Understanding machine helps design.
Injection molding machine components
Tonnage = projected area × cavity pressure. Typical 30-100 tons for small parts. 1000+ tons for large.
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
Tonnage = projected area × cavity pressure. Typical 30-100 tons for small parts. 1000+ tons for large.
Screw rotates and slides forward. Barrel heats material. Both maintain melt temperature.
Hot runner: faster cycle, less waste, $5-20K tool premium. Cold runner: cheaper, slower, runner waste.
Cooling 50-80% of cycle time. Conformal cooling channels reduce significantly.
Spray-on release for difficult parts. Periodically as needed. Permanent coatings premium.
Match machine to part. Too small: not enough force. Too big: wastes capacity.
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