INJECTION MOLD AND TOOLING

Stack Molding

Without changing your molding press or tonnage, a stack mold increases productivity and reduces your part costs by using a stack of multiple mold layers. Simultaneously closing all layers in the stack enables molding all parts, in all layers, in one shot. In addition, the molded parts can have a different geometry. A1 was one of the early innovators of stack molds in the 1960s, and our experience qualifies us as experts in stack molds.

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Stack Mold Additional Features

Concerned about cost? Don’t be. A stack mold can reduce the need for multiple molds and multiple presses, providing immediate and exponential cost savings.

Multi-cavity
Different geometry
Different sizes
Different fill rates
Modular capability – with interchangeable inserts, one stack mold can run multiple parts, further reducing mold costs.

A1 has refined stacks with proprietary self-supporting center racks and innovated all the little details that prolong the life of a stack mold. Not sure if your part qualifies for a stack? Contact us.

Stack molding example

The customer needed to increase throughput based on consumer demand for a plastic roof ridge vent. Rather than running two molds in different presses, A1 engineered a stack tool that virtually doubled capacity in a single press.

Stack Mold - Large Increase in Capacity Example

Part Height: 2.8”
Volume: 52 cubic inches
Material: CO-PP
Part Weight: 772 grams
Projected Area: 664 square inches
Shrink: 1.018 inches
Total mold weight: 31,000 lbs.
External Mold Dimensions: 55”W x 68”H x 36”L

White Paper

WHAT IS A STACK MOLD AND HOW DOES IT WORK?

Stack molds can increase productivity by up to four times in some cases. See how by in our white paper.

Download White paper