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Molded-In Inserts
Inserts are installed during the injection mold operation.
The insert is placed on a core pin in the injection mold and the plastic is molded around the insert. Proper pin size is important to retain insert in place.
Advantages and Disadvantages of a Mold-in Insert
Advantages
- Excellent holding strength
- Excellent plastic flow around insert
- No secondary assembly
- Multiple inserts can be installed during the molding cycle
Disadvantages
- Longer cycle times - more costly
- Plastic can get into the threads
- Mold Damage possible if misloaded
- Inserts need to be removed before plastic can be reground if plastic part is defective
- Molded-in Stress & Possible Sink Marks
