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An apparatus for injection moulding plastics closure elements into apertures in the central panels of a plurality of can ends comprises a first mould tool, a second mould tool, and a mechanism for bringing the mould tools together to clamp on opposed surfaces of each central panel and thereby define

An apparatus for injection moulding plastics closure elements into apertures in the central panels of a plurality of can ends comprises a first mould tool, a second mould tool, and a mechanism for bringing the mould tools together to clamp on opposed surfaces of each central panel and thereby define a mould cavity enclosing a margin of panel material around the aperture and spanning both sides of the aperture. A passageway in at least one of the moulded tools permits injection of plastics material into the mould cavity. The first mould tool includes a plurality of cavity defining mould portions each slidably guided in a respective bore in the first mould tool and a resilient support in each bore to urge each mould portion towards the second mould tool. A stripper plate surrounds the mould inserts and is formed with an annular recess situated laterally outside of and around each insert to receive the outer circumference of a can end to properly locate the can end.

대표청구항 ▼

Apparatus for injection moulding plastics closure elements into apertures in the central panels of a plurality of can ends, said apparatus comprising a first mould tool; a second mould tool; means effective to bring the mould tools together to clamp on opposed surfaces of each central panel and ther

Apparatus for injection moulding plastics closure elements into apertures in the central panels of a plurality of can ends, said apparatus comprising a first mould tool; a second mould tool; means effective to bring the mould tools together to clamp on opposed surfaces of each central panel and thereby define a mould cavity enclosing a margin of panel material around the aperture and spanning both sides of said aperture; and a passageway in at least one of the mould tools to permit injection of plastics material into each said mould cavity, wherein, the first mould tool includes a plurality of cavity defining mould portions each slidably guided in a respective bore in said first mould tool and resilient support means in each bore tourge each said mould portion towards the second mould tool; and the second mould tool includes a plurality of mould inserts each defining a cavity to cooperate with a cavity of a mould portion in the first tool, so that upon closing of the first mould tool to the second mould tool any mould portion closing upon a relatively thick can end panel will be urged, by the cooperating insert, to retract into its bore and permit clamping of a relatively thin can end panel between another mould portion and its cooperating mould insert, and sealing of all the moulds will be established before plastics material is injected into the mould cavity, each mould insert having a passageway through which the plastics material is injected into the mould cavities, the lower tool comprising a hollow block in which the mould inserts are seated and supported and in which a hot runner extends to convey plastics material to the passageways in the mould inserts.