Plastic and nonmetallic article shaping or treating: processes – Direct application of fluid pressure differential to... – Including application of internal fluid pressure to hollow...
Patent
1981-07-13
1983-12-27
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...
264521, 264522, 264526, 264529, 264545, 264547, 425504, 425525, 425388, B29C 1704, B29C 1707
Patent
active
044230001
ABSTRACT:
A method for producing a hollow synthetic resin article, which comprises opening a split mold having an inner molding surface with a contour conforming to the configuration of the desired article, feeding a heated molding material of a thermoplastic synthetic resin in the form of a tube or two parallel-laid sheets into a space between the opposing mold members of the split mold, applying a negative pressure to vacuum suction holes provided in the molding surfaced and the parting surfaces of the split mold to vacuum-form the molding material, and while the negative pressure is being applied or after the application of the negative pressure is stopped, closing the mold to form the molding material into the final desired configuration. A hollow synthetic resin article having a general configuration corresponding to two trays joined at their bottoms with a hollow portion formed at their periphery and including at least one non-hollow first portion resulting from joining of the bottoms of the two trays and at least one hollow second portion resulting from joining of the bottoms of the two trays and being isolated from said peripherally located hollow portion may be produced by the above method using a split mold having mold cavities conforming to the above specified configuration.
REFERENCES:
patent: 3099043 (1963-07-01), Held, Jr.
patent: 3235638 (1966-02-01), Winstead
patent: 3242245 (1966-03-01), Greig et al.
patent: 3334164 (1967-08-01), Samuels et al.
patent: 3444034 (1969-05-01), Hewett
patent: 3452125 (1969-06-01), Schurman et al.
patent: 3548043 (1970-12-01), Held, Jr.
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