Plastic and nonmetallic article shaping or treating: processes – Reactive gas or vapor treatment of work – Work is organic material
Patent
1976-10-26
1978-01-24
Silbaugh, Jan H.
Plastic and nonmetallic article shaping or treating: processes
Reactive gas or vapor treatment of work
Work is organic material
264 97, 264 98, 264154, 264155, 264159, 264163, 264296, 425290, 425527, 425530, B29C 1707, B29C 1710
Patent
active
040704297
ABSTRACT:
A method is 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), Di Settembrini
patent: 3338998 (1967-08-01), Di Settembrini
patent: 3492106 (1970-01-01), Peters et al.
patent: 3754851 (1973-08-01), Reilly et al.
Heberling Richard D.
Owens--Illinois, Inc.
Silbaugh Jan H.
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