Method for blowmolding a container

Details Method for blowmolding a container Method for blowmolding a container

1980-10-15

1982-06-08

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Including application of internal fluid pressure to hollow...

264531, 264534, B29C 1707

Patent

active

043339050

ABSTRACT:
A method for blow molding of containers with a thickened bead at the bottom end thereof by the steps of extruding a tubular parison, closing the mold thereabout, preblowing the parison within a mold cavity under low pressure so as to partially inflate the parison to a major extent, raising the bottom wall of the mold cavity so as to contact the partially inflated parison in a manner forming a thickened bead between bottom and surrounding adjacent mold cavity wall parts, and thereafter finish-blowing the parison within the mold cavity with a blow medium under high pressure so as to inflate the parison to the intended finished size before opening of the mold for removal of the container.

REFERENCES:
patent: 3050773 (1962-08-01), Hagen
patent: 3138279 (1964-06-01), Meissner
patent: 3424829 (1969-01-01), Peters et al.
patent: 3555134 (1971-01-01), Marcus
patent: 3949034 (1976-04-01), Uhlig
patent: 4117062 (1978-09-01), Uhlig
patent: 4177239 (1979-12-01), Gittner et al.

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