Key principles.
Two-shot injection
Two materials in sequence. Fully automated. Same machine.
Pre-placed insert
Pre-made insert (metal, plastic) placed in mold. Plastic injected around.
Auto-cycle
Two injection cycles per part. Continuous automation.
Manual or robot
Insert placed before each cycle. Robot or manual labor.
2-shot tooling
Two-shot tooling enables precise geometry combination.
Compatibility
Materials must bond. Some pairs need mechanical interlock.
FAQ
High-volume two-material parts (TPE on PP for soft grips). Continuous automation.
Embedded metal inserts (threaded inserts in plastic), pre-made components in plastic.
Two-shot tooling 1.5-2× single-shot. Insert molding similar to single-shot tooling + insert handling.
Overmolding ~50-80% longer than single-shot. Insert molding similar to single-shot cycle.
Overmolding 20K+ pieces/year. Insert molding 1000+ pieces/year.
Overmolding: tool grips, toothbrushes. Insert molding: threaded inserts in plastic enclosures.
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