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.