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3 Plate Plastic Mold

Basically three plate molds has two parting line, and floating plate, floating plate support by support pin, Since the mold has two parting planes, the runner system can be located on one side of floating plate or make special plate that attach in floating plate, we called runner plate, see post about runner plate. Three plate molds are used because of their flexibility in gating location. This types of molds is flexible even use in multiple cavity.

Advantages As parts and runners can automatically be removed separately, this is suitable for automation and is widely used for mass production. Disadvantages The structure is more complicated than that of a two-plate mold. The cost is also higher.
A three-plate mold has two parting lines (PL: where the mold divides) to remove a runner and a part, and is composed of three parts: fixed side, moving side, and runner stripper plate.