Method for making a container with a unitary but removable closu

Details Method for making a container with a unitary but removable closu Method for making a container with a unitary but removable closu

1983-06-29

1985-09-10

Silbaugh, Jan

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Including application of internal fluid pressure to hollow...

264533, 264536, 425524, 425525, 425535, B29C 1707

Patent

active

045405425

ABSTRACT:
A method and apparatus are provided for molding a container such as an ampoule with a hermetically sealed top or closure joined to the upper portion of the container with a peripheral frangible web. Main mold halves defining a cavity are provided with an inwardly projecting portion that defines an upwardly facing bearing surface and a forming edge. A mandrel is provided with at least a downwardly facing first frustoconical sealing surface and with a frustoconical engaging surface extending downwardly and inwardly from the downwardly facing first frustoconical sealing surface. The mandrel is adapted to be positioned in a length of parison extending from the main mold means to temporarily seal the parison opening during vacuum or blow forming of the container. The parison is engaged and pressed by the mandrel against the main mold means upwardly facing bearing surface to effect a temporary sealing of at least the mandrel against the parison and to effect a compression of the parison between the mandrel and the forming edge of the main mold means to form a reduced thickness section of parison which, upon subsequent retraction of the mandrel means and upon subsequent formation of the sealed top of the container, defines a peripheral frangible web below the sealed container top.

REFERENCES:
patent: 3283047 (1966-11-01), Savary
patent: 3487501 (1970-01-01), Siard et al.
patent: 3793421 (1974-02-01), Paubandt
patent: 3851029 (1974-11-01), Cornett, III et al.
patent: 3862698 (1975-01-01), Hafele
patent: 4143453 (1979-03-01), Taluba

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