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March 13 2016


Stack Molding For Plastic Injection Molding


Stack molds are one of the most amazing production tools found anywhere. The engineering and craftsmanship that goes right into a stack mold is a marvel.

automotive mould

For your layman, who may never have built a plastic injection mold, it may seem like a large, fancy bit of machinery that creates plastic widgets. Yet, from the perspective of an plastics mold maker, stack molds represent a really higher level of expert knowledge.

Just what is a stack mold?

There are numerous variations on the theme of stack molds, however some common features are:

 Built for quite high production runs

 Have single cavity and multiple cores

 Use indexable cores to injection mold multi-materials

 Have to be able to do multiple operations inside the molding cycle

Basically, a stack mold includes a stationary "A" half, and at least two "B", or moveable halves. These are like the rotary molds which have been in use for quite some time, but they are vertical as opposed to horizontal.

Which means that the moveable cores rotate with regards to a vertical axis, as opposed to a horizontal. Also, the stack mold is very compact and it has a significantly smaller footprint.

Are stack molds expensive?

Yes, stack molds are quite expensive. That is why an increased volume is required to justify their expense. However, specifically in medical or cosmetic molding, the ROI is easily realized.

Thinking about the boat load of engineering and mold making involved, the expenses is understandable. Designing and creating a stack mold isn't for starters, or mold makers who cut corners! Plastic injection molding isn't easy, and stack molding is with an entirely new level.

What are the applications for stack molds?

Since they're for high production products, the normal applications are suitable for cosmetics and consumables, such as deodorant or toothpaste containers. Automotive and medical products are also frequently produced using stack molds.

More and more merchandise is being involving soft overmolding, like toothbrushes or hairbrushes. These are generally perfect applications for stack molding.Since the part is injection molded, ovemolded, cooled and ejected in sequential cycles, production costs may be minimized.

What are benefits of stack molding?

Stack molds can be found in numerous configurations to fulfill various molding demands. Stack molding offers an economical and efficient manufacturing solution for that output of multiple plastic parts. Injection molding organizations are always searching for more efficient strategy for molding, as well as the right

Many of the benefits of the stack molding process include: Increased output efficiency (productivity)

 Decreases number of machines required

 Lower machine size requirement vs.. multi-cavity single face molds

 Produce twice as many parts without increasing press size or clamp tonnage, which greatly reduces part costs

 Set-up some time and run-time pricing is divided by all the parts produced

 Producing the front and back areas of a key fob concurrently is a useful one of an application for stack molding

 Mold ejection functions are self-contained, no additional labor or steps required

Coto Mold is a plastic injection mold making company located in Shenzhen of China that very close to Hong Kong. Today we have 10+ years experience in plastic mold making industry and we have strong technical background including our sales staff. More than 90% molds we made are for overseas customers, the mold including 2K mold, over mold, insert mold, hot runner mold etc., the products are for different fields like Automotive , Home appliance, Electrical, Medical, Packaging and so on.

Don't be the product, buy the product!