Plastic article or earthenware shaping or treating: apparatus – Female mold and means to shape parison directly by internal... – Forming baffle – bottleneck – or handle
Patent
1977-07-07
1978-09-26
Lazarus, Richard B.
Plastic article or earthenware shaping or treating: apparatus
Female mold and means to shape parison directly by internal...
Forming baffle, bottleneck, or handle
425530, 425812, B29D 2303
Patent
active
041166086
ABSTRACT:
A method and apparatus are disclosed for forming a plastic container by a blow molding operation. In the method, a tubular thermoplastic parison is blown to a preform within a first mold by a blow pipe inserted into one axial open end of the parison. Prior to removing the preform from the first mold, a secondary opening is formed in the wall of the preform, either by a spike-shaped piercing surface over which the parison is expanded or by a vent port through which blow air is exhausted to rupture an opening in the preform wall. The preform is then transferred to a second mold, which pinches shut the initial blowing opening of the preform. A second blow pin is inserted into the secondary opening to supply blow air under pressure to expand the preform to a container. The secondary opening may be formed into a finish opening on the container during the second blow molding operation, thus enabling the finish opening to be located at a position remote from the position on the container which corresponds to an axial extremity on the original tubular parison.
REFERENCES:
patent: 3337911 (1967-08-01), De Settembrini
patent: 3339232 (1967-09-01), Battenfeld et al.
patent: 3492106 (1970-01-01), Peters et al.
patent: 3887316 (1975-06-01), Hestehave
patent: 3973896 (1976-08-01), Peters
Click Myron E.
Heberling Richard D.
Lazarus Richard B.
Owens--Illinois, Inc.
Wilson, Jr. David H.
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