Plastic and nonmetallic article shaping or treating: processes – Direct application of fluid pressure differential to... – Including application of internal fluid pressure to hollow...
Patent
1976-07-23
1979-04-03
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...
264294, 264328, 425528, 425533, 264537, B29C 1707
Patent
active
041477480
ABSTRACT:
Apparatus and method for forming hollow articles from plasticized materials are disclosed. A preform is partially formed under substantially no pressure on a preform core by introducing the core into a void-free charge of plasticized material that is placed in a preform cavity from a source of the plasticized material. After the preform core and preform cavity have moved together to define a preform mold space, the charge of plasticized material is subjected to a pressure forming step to form a completely packed preform on the core. The preform is then blow-molded in a blow cavity by introducing blowing gas into the preform through the preform core. Neck mold structure that strips and releases the formed article from the core is also disclosed.
REFERENCES:
patent: 1945255 (1934-01-01), Camagni
patent: 2313110 (1943-03-01), Wertz
patent: 2981976 (1961-05-01), Maier
patent: 3166025 (1965-01-01), Hulse
patent: 3337910 (1967-08-01), West
patent: 3375553 (1968-04-01), Criss
patent: 3670066 (1972-06-01), Valyi
Page M. Richard
Silbaugh Jan H.
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