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Knit Marks

A core pin blocks the normal path of the molten material as it enters the mold. A weak point called a knit mark can be created on the “back side” of the pin where the material flows together.

These weak points can be eliminated by proper placement of the gate, or material entry point. It is therefore critical that you call out areas where knit marks cannot be tolerated so that potential problems can be eliminated in the mold design stage.