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The use of two-stage ejection technology is one of the ways in which complex parts with undercuts can be demolded. This seemingly straightforward mechanism, with its force-controlled and low-play movement, even permits the release of undercuts located inside the part, said Hasco Hasenclever GmbH, a global supplier of hot runner systems technology.

Clare Goldsberry

April 7, 2014

1 Min Read
Hasco improves two-stage ejection

The use of two-stage ejection technology is one of the ways in which complex parts with undercuts can be demolded. This seemingly straightforward mechanism, with its force-controlled and low-play movement, even permits the release of undercuts located inside the part, said Hasco Hasenclever GmbH, a global supplier of hot runner systems technology. 

Another technology used in two-stage ejection is in molds that incorporate a stripper plate, or for the separate demolding of the sprue and part. For that, Hasco supplies the Z1692 to implement special series sequences, such as those required for underground slides or inclined sliding carriage elements.

These advanced two-stage ejectors, which are designed for central installation, make it possible to define the two strokes that are required independently of each other. This independence is achieved because the stroke of the three standard sizes, with maximum stroke lengths of up to 180 mm, can be adjusted by means of a simple modification.

Z1692-DLC-300_0.jpgHasco also supplies the two-stage ejector Z16291 as a special, customized version with pre-set strokes.

The functional surfaces of all Hasco two-state ejectors have a diamond-like carbon (DLC) coating to allow these products to be used in cleanrooms and for the production of parts for medical device and food industry components. With its hardness and slip properties, the DLC layer helps to avoid abrasive and adhesive wear. By eliminating lubricants, maintenance costs and downtime are reduced, said Hasco.

About the Author(s)

Clare Goldsberry

Until she retired in September 2021, Clare Goldsberry reported on the plastics industry for more than 30 years. In addition to the 10,000+ articles she has written, by her own estimation, she is the author of several books, including The Business of Injection Molding: How to succeed as a custom molder and Purchasing Injection Molds: A buyers guide. Goldsberry is a member of the Plastics Pioneers Association. She reflected on her long career in "Time to Say Good-Bye."

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