Progressively extractable core mandrel - for moulding cylindrical thin-walled tubes for rapid, automatic disengagement from the moulding

摘要

Core mandrels for moulding thin wall plastics tubes without an internal or external longitudinal relief or taper angle are made in three segments with oblique interfaces connected by sliding dovetail faces. The slide faces have steps which engage for successive mutual extn. of the core from within the mould. Suitable for relatively rapid mould cycling using automatic tools, e.g. for injection moulding. More robust and compact than mandrels with radially collapsible segments.