Plastic and nonmetallic article shaping or treating: processes – Direct application of fluid pressure differential to... – With internal application of fluid pressure
Patent
1991-05-16
1992-08-04
Tentoni, Leo B.
Plastic and nonmetallic article shaping or treating: processes
Direct application of fluid pressure differential to...
With internal application of fluid pressure
264 37, 2642972, 2643288, 26432812, 26432813, B29C 4500, B29C 4512, B29D 2200
Patent
active
051357038
ABSTRACT:
A combination plastic and gas injection nozzle assembly and method of operation in which the nozzle assembly includes a plastic resin passage, a closure member for the plastic resin passage, a gas flow passage, and a closure member for the gas flow passage all coaxial with respect to one another. Actuating cylinders are provided for moving both closure members between open and closed positions. The actuating cylinders being positioned coaxial with the other elements to eliminate off-set loading of the nozzle components. A sequential molding operation is disclosed in which a plurality of mold cavities defined by a single mold assembly are injected by one or more nozzles with plastic and a gas to form hollow spaces in the molded article. The cavities are injected with plastic one at a time to reduce the required mold clamping forces and enable independent control of plastic injection into each cavity. After partially filling each mold cavity, the nozzles are used to inject pressurized gas into the molten resin forcing the resin against the surface of the mold cavities and forming hollow spaces within the molded articles.
REFERENCES:
patent: 4601870 (1986-07-01), Sasaki
patent: 4740150 (1988-04-01), Sayer
patent: 4824732 (1989-04-01), Hendry et al.
patent: 4855094 (1989-08-01), Hendry
Daly Neil
Hunerberg Edward C.
Hoover Universal Inc.
Tentoni Leo B.
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