Plastic and nonmetallic article shaping or treating: processes – Direct application of fluid pressure differential to... – With internal application of fluid pressure
Patent
1990-07-16
1991-12-03
Tentoni, Leo B.
Plastic and nonmetallic article shaping or treating: processes
Direct application of fluid pressure differential to...
With internal application of fluid pressure
264155, 264161, 2643288, 26432812, 26432813, 425812, B29C 4500, B29C 4538, B29D 2200
Patent
active
050698583
ABSTRACT:
A method of gas-assisted injection molding in which a first charge of pressurized gas is injected into the mold, but not into the article-defining cavity. The gas charge is of a predetermined pressure sufficient to assist in filling out the article-defining cavity with resin and promoting surface quality. A second charge of pressurized gas may be introduced into the mold at a location remote from a first resin flow path by which the resin entered the article-defining cavity. The second charge of gas is of a pressure and quantity sufficient to enter the article-defining cavity but not into the first resin flow path. In the embodiment of FIGS. 9 and 10, the second charge of gas is directly introduced into the article-defining cavity. In the embodiment of FIGS. 4 through 8, the second charge of gas is introduced into a resin reservoir in communication with the article-defining cavity by a second resin flow path. Alternatively, when introduced to the resin reservoir, the second charge of gas is of a pressure and quantity sufficient to enter the resin reservoir and the second resin flow path but not into the article-defining cavity.
REFERENCES:
patent: 3044118 (1962-07-01), Bernhardt et al.
patent: 4101617 (1978-07-01), Friederich
patent: 4740150 (1988-04-01), Sayer
patent: 4830812 (1989-05-01), Kauer
Rusch, K. C. "Gas-Assisted Injection Molding-The New Thermoplastic Molding Technology for Exterior Body Panels," (Mar., 1989).
Milad Limited Partnership
Tentoni Leo B.
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