Method and apparatus for blow molding a plastic drinking vessel

Details Method and apparatus for blow molding a plastic drinking vessel Method and apparatus for blow molding a plastic drinking vessel

1993-08-26

1995-11-14

Timm, Catherine

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Differential temperature conditioning

264533, 264534, 264536, 425525, 425526, 425527, B29C 4950, B29C 4964

Patent

active

054664136

ABSTRACT:
A substantially cylindrical plastic parison is expanded within a blow mold against the internal walls thereof to form a plastic drinking vessel with a rim having substantially smooth inner and outer surfaces thereon. The inner surface is formed by a reciprocating cutter head assembly including an annular cutter blade with an outside diameter slightly less than the inside diameter of wall surfaces of the blow mold adjacent to a peripheral recess in the blow mold in which an external bead on the rim is formed. The cutter blade and cutter head assembly form a dome-shaped top in response to expansion of the parison. When the cutter blade is retracted axially from the blow mold the dome-shaped top is severed from the vessel. In an alternative embodiment the vessel and a partially severed dome-shaped top are removed as an integral unit from the blow mold and the dome-shaped top is then completely severed from the vessel utilizing a rotary cutter blade.

REFERENCES:
patent: 3004285 (1961-10-01), Hagen
patent: 4095927 (1978-06-01), Roberg et al.
patent: 4445406 (1984-05-01), Thatcher
patent: 5209891 (1993-05-01), Guarriello et al.
patent: 5213753 (1993-05-01), Przytulla

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