Apparatus for making tamper-evident closures

Details Apparatus for making tamper-evident closures Apparatus for making tamper-evident closures

1988-10-11

1989-11-21

Woo, Jay H.

Plastic article or earthenware shaping or treating: apparatus

Female mold and charger to supply fluent stock under...

Mold having movable core or movable pin

249 52, 249 59, 425812, 425DIG58, B29C 4534

Patent

active

048818925

ABSTRACT:
A mold for forming a plastic closure includes a first mold part defining a female cavity and a second mold part defining a male mold cavity surface, with the second mold part including a core having a knock-out pin reciprocated therein and surrounded by a fixed sleeve which cooperate to define a tamper-evident band on the cavity for the closure. Vents are provided for venting the lower edge of the cavity during the ejection-molding process. Also, the knock-out pin has a lubricant pocket formed on the peripheral surface thereof.

REFERENCES:
patent: 2744288 (1956-05-01), Fienberg et al.
patent: 4155698 (1979-05-01), Aichinger
patent: 4552328 (1985-11-01), Dutt et al.
patent: 4741447 (1988-05-01), John

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