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Servo Drives Deliver Benefits for High-Cavitation Molds

OEM Application Note: Technology enables a more effective arrangement of mold drive shafts, belts and pulleys in cleanroom applications.

StackTeck servo drives for unscrewing molds for use in cleanroom applications.
StackTeck servo drives for unscrewing molds for use in cleanroom applications.

In the injection-molding business, StackTeck serves as a global provider of integrated plastic tooling. That can include anything from product and mold design to complete systems integration. The company aims to deliver high productivity for caps, closures, thinwall packaging, technical and medical markets.

Its medical mold experience focuses on medical disposables, research, testing and diagnostic plastic components and medical packaging. “In many cases, these components are very intricate, requiring complex mold ejection sequences and/or designs, as well as quality optical finishes,” says the company’s website.

In December 2016, StackTeck noted that it had “successfully developed and implemented servo drives for two high-cavitation molds for cleanroom applications. This technology enables a more effective arrangement of mold drive shafts, belts and pulleys while incorporating a sealed drive system.”

StackTeck manufactures the molds, while the servo drives, pulleys, and belts are purchased from a global supplier.

The company explains that unscrewing molds are typically used to injection-mold closures and fitments that have a heavy-duty internal thread (as opposed to strippable threads that are typically used on beverage caps).The unscrewing action is used to unwind the part from the mold and eject it without causing deformation to the thread.

Servo benefits

The servo drives (and molds) provide the following benefits:

• The servo drive approach is more suitable for cleanroom molding than conventional unscrewing molds that use a hydraulic cylinder that drives a large rack assembly on top of the mold. Converters prefer not to have either hydraulic components or racks that need grease to run in a cleanroom environment.

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