Plastic and nonmetallic article shaping or treating: processes – With measuring – testing – or inspecting
Patent
1996-05-29
1998-02-10
Heitbrink, Jill L.
Plastic and nonmetallic article shaping or treating: processes
With measuring, testing, or inspecting
264 403, 264 51, 264 85, 264572, 2643281, 26432813, 425 4R, 425146, 425546, B29C 4534
Patent
active
057165610
ABSTRACT:
A method of injection molding for use with an injection molding machine (10) includes: (a) generating pressurized gas and pressurized moisture within molten plastic as plastic pellets are plasticized in the injection molding machine (10), the pressurized gas and the pressurized moisture having a total pressure defining an internal counterpressure within the molten plastic; (b) pressuring air within a cavity (30) of a mold (22) in the injection molding machine (10) to an air pressure level which is substantially equal to the internal counterpressure in order to counterbalance the internal counterpressure as the molten plastic is injected into the cavity (30), thus providing a substantially pressure balanced molding environment for the plastic; and (c) maintaining the air pressure level in the cavity (30) substantially constant as the molten plastic is injected into the cavity (30). A control system is provided for maintaining desired differences between the air pressure in the cavity and the melt pressure in order to maintain a static pressure in the melt during injection to improve part quality and reduce manufacturing costs.
REFERENCES:
patent: 3044118 (1962-07-01), Bernhardt et al.
patent: 3532154 (1970-10-01), Balevski
patent: 3632703 (1972-01-01), Sullivan et al.
patent: 3694529 (1972-09-01), Josephsen et al.
patent: 3819313 (1974-06-01), Josephsen et al.
patent: 3893792 (1975-07-01), Laczko
patent: 3960996 (1976-06-01), Balevski et al.
patent: 3988403 (1976-10-01), Angell, Jr. et al.
patent: 4092385 (1978-05-01), Balevski et al.
patent: 4101617 (1978-07-01), Friederich
patent: 4153231 (1979-05-01), Hayakawa et al.
patent: 4208368 (1980-06-01), Egli
patent: 4288398 (1981-09-01), Lemelson
patent: 4312820 (1982-01-01), Arnold et al.
patent: 4318874 (1982-03-01), Lemelson
patent: 4333901 (1982-06-01), Young et al.
patent: 4498860 (1985-02-01), Gahan
patent: 4636084 (1987-01-01), Kopernicky
patent: 4675141 (1987-06-01), Kumazaki
patent: 4685872 (1987-08-01), Erlenbach
patent: 4740150 (1988-04-01), Sayer
patent: 4750409 (1988-06-01), Hendry
patent: 4797236 (1989-01-01), Kojima
patent: 4824732 (1989-04-01), Hendry et al.
patent: 4852028 (1989-07-01), Korpela et al.
patent: 4923666 (1990-05-01), Yamazaki et al.
patent: 4923667 (1990-05-01), Sayer
patent: 4942006 (1990-07-01), Loren
patent: 4943407 (1990-07-01), Hendry
patent: 5098637 (1992-03-01), Hendry
patent: 5264163 (1993-11-01), Lemelson
patent: 5441680 (1995-08-01), Guergov
patent: 5482669 (1996-01-01), Shah
patent: 5558824 (1996-09-01), Shah et al.
patent: 5566743 (1996-10-01), Guergov
"New Advancements in Countrpressure Structural Foam Processing", Michael Caropreso Typical Clamp Requirements, pp. 79-81, 1984.
"How the TM-Process Works", date unknown.
"The Helga Process", Dr. Siebolt Hettinga, date unknown.
"TM-Process: Counter Pressure Injection Moulding Of Structural Foam Parts" Brochure, Metal Technology Research & Production Corporation, date unknown.
"The Airmould Process-A Pressure Controlled Gas-assisted Injection Molding Process", Dipl.-Ing. Helmut Eckhardt, date unknown.
"Helga . . . The Gentle Approach To Gas-A" (Booklet). date unknown.
Pamplet: "TM Process13 Injection Molding of Structural Foam", date unknown.
International Preliminary Examining Authority, "Written Opinion", Mar. 15, 1996, 3 pages, Claim 1-9.
International Searching Authority, "Notification of Transmittal of the International Search Report or the Declaration", Apr. 9, 1996, 4 pages, Claims 1-4.
"Investigation of Processing-Structure-Property Relationships in Structural Foam Molding", Alex W. Kawczak & Duane Krueger, The Dow Chemical Company, pp. 67-78, date unknown.
"Injection Molding: Gas Counter Pressure Process", Integral/Structural Polymer Foams, Editors: G. Henrici-Olive and S. Olive; English by F.A. Shutov, 1986, pp. 71-41.
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