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Stack Mold
Stack molds are essentially two molds connected inline. When a stack mold opens it has two parting lines and produces double the parts. This is similar to high-cavitation tooling, but these parts are spread out over overlapping surface areas so the molds have a smaller footprint. The major advantage being that it takes less clamping pressure (tonnage) to produce additional cavities, so smaller tonnage presses can often be utilized. However, specialized injection press features and high cost tooling can be limiting factors.
While it may be possible to retrofit a standard press to run stack molds in certain conditions, Matrix typically does not sample or run production on stack tooling.