Stack Mold

Stack mold Capability Stack mould Stack plastic mold Stack plastic tool Stack injection mould Stack injection tool The defining characteristic of a stack mold is the two mold parting surfaces or mold split lines. A stack mold does not require much more clamp force than a single-face mold because...

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Stack mold
Capability
Stack mould
Stack plastic mold
Stack plastic tool
Stack injection mould
Stack injection tool

 

The defining characteristic of a stack mold is the two mold parting surfaces or mold split lines. A stack mold does not require much more clamp
force than a single-face mold because the projected part surface areas of the cavities on both sides of the center block cancel out each other's force.
A stack mold can be described as a series of interconnected, same-sized, single-face molds, where the molds are "stacked" next to the other. Thus, without increasing the plastic injection molding machine platen size or tonnage, stack molds double the number of cavities producing parts. Three-level and four-level stack molds triple or quadruple production volumes, respectively.
Most stack molds have an equal number of the same cavities in each side of the mold, or parting surface, but they can also have different cavities in each mold parting surface to produce a family of parts per shot, with each part being a different shape and size.
When the stack mold opens for the ejection of parts, both mold parting surfaces open (in most cases simultaneously) by means of a mechanical connection between the mold center block, the fixed halves of the mold and the moving half of the mold.

 

The mechanical connection, which moves the center block of the mold, can be:
a rack and gear operated motion system
a harmonic lever system
a hydraulic push-pull system
a helical gear system

 

Advantage of stack mold is as below:
1,Stack molding requires less space
2,Reduced waste
3,Doubled part production (more for three- and four-level stack molds)
4,Optimal molding efficiency
5,Reduced production and part cost
6,Ability to mold multi-component assemblies or a family of parts in one shot on one plastic injection molding machine


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