MOULDING OF PLASTICS ARTICLES

摘要

MOULDING OF PLASTICS ARTICLES A mould having a switch located within a passage interconnected with the mould cavity, the switch being at a distance from the cavity to operate upon flow of mouldable material along the passage to a switch operating location. The distance of the switch operating location from the cavity and the cross-sectional area of the passage ensures that moundable material flows to the operating location only upon pressure build-up within the mould after filling of the mould cavity.