Stack Mold Technology & Application  

What is Stack mold?

Stack mold can be described as a mold assembly consisting of a series of single-face molds of the same size, mounted back-to-back or “stacked” next to the other. Without increasing the plastic injection molding machine platen size or tonnage, stack molds double (or more for increased stack mold levels) the output of standard plastic injection molds, increasing molding efficiency and reducing the overall part cost. Stack molds can also produce multi-component assemblies or a family of parts in one shot on one plastic injection molding machine.

 

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.

Advantages

Doubled Part Production
Instead of increasing the mold size by adding more cavities, a stack mold maintains mold size and machine size by adding a second layer of cavities parallel to the first layer. The fill, pack and cooling time remain the same for a stack mold and only the mold open and mold close time will add slightly to the cycle time.

Reduced Production and Part Cost.
The part price is determined by the machine hour rate, which is directly related to the machine clamp tonnage. A stack mold requires only about half the clamp tonnage than a single-face mold with the same number of cavities.

Optimal Molding Efficiency and Improved Automation
Stack molds can produce multi-component assemblies in one shot and in one machine using the same parameters. By comparison, single-face molds would require the production synchronization between multiple machines, complicating post-molding operations.

 

What is the advantages of stack mould?

 

  1. Optimal Molding Efficiency and Improved Automation
    Stack molds can produce multi-component assemblies in one shot and in one machine using the same parameters. By comparison, single-face molds would require the production synchronization between multiple machines, complicating post-molding operations.
  2. Doubled Part Production
    Instead of increasing the mold size by adding more cavities, a stack mold maintains mold size and machine size by adding a second layer of cavities parallel to the first layer. The fill, pack and cooling time remain the same for a stack mold and only the mold open and mold close time will add slightly to the cycle time.
  3. Reduced Production and Part Cost.
    The part price is determined by the machine hour rate, which is directly related to the machine clamp tonnage. A stack mold requires only about half the clamp tonnage than a single-face mold with the same number of cavities.

 Stack Mould Applications

Stack molds benefit many applications, some of which include:

Consumer products, such as toilet seat

Thin wall containers, lids, closures and caps

Medical disposables

Housewares

Vehicle lens and trim components

Packaging food, cosmetics, medical, industrial

Stack Mold

HS Mold has rich experience in  stack mold design and manufacturingin house. Contact us for your custom plastic injection molding  project today!

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