Plastic article or earthenware shaping or treating: apparatus – With mechanical means forming or expanding pores
Reexamination Certificate
2007-09-11
2007-09-11
Kuhns, Allan R. (Department: 1732)
Plastic article or earthenware shaping or treating: apparatus
With mechanical means forming or expanding pores
C425S00400R, C425S208000, C425S532000, C425S562000
Reexamination Certificate
active
10462387
ABSTRACT:
The invention provides systems, methods, and articles useful in the production of foams, and, in particular microcellular foams. The systems include a restriction element that reduces the backflow of polymer melt in an extruder while polymeric material is injected into a mold or ejected from a die. The restriction element is positioned upstream of a blowing agent injection port to maintain the solution of polymer and blowing agent in the extruder above a minimum pressure throughout an injection or ejection cycle, and preferably above the critical pressure required for the maintenance of a single-phase solution of polymer and blowing agent. The systems can be used in injection molding, blow molding, or in any other processing techniques that include injection or ejection cycles. In some embodiments, the systems utilize reciprocating screws for injection or ejection. In other embodiments, the systems include an accumulator connected to an outlet of the extruder, in which a plunger moves to inject polymeric material into a mold or eject polymeric material from a die.
REFERENCES:
patent: 3436446 (1969-04-01), Angell
patent: 3687582 (1972-08-01), Hendry et al.
patent: 4096218 (1978-06-01), Yasuike et al.
patent: 4124308 (1978-11-01), Sokolow
patent: 4124336 (1978-11-01), Johnson
patent: 4229395 (1980-10-01), Nagumo et al.
patent: 4381272 (1983-04-01), Ehritt
patent: 4473665 (1984-09-01), Martini-Vvedensky et al.
patent: 4512733 (1985-04-01), Eichlseder et al.
patent: 4761256 (1988-08-01), Hardenbrook et al.
patent: 4783292 (1988-11-01), Rogers
patent: 4783295 (1988-11-01), Kearns et al.
patent: 4898760 (1990-02-01), Halberstadt et al.
patent: 5124095 (1992-06-01), Gianni et al.
patent: 5158986 (1992-10-01), Cha et al.
patent: 5160674 (1992-11-01), Colton et al.
patent: 5164207 (1992-11-01), Durina
patent: 5258158 (1993-11-01), Dray
patent: 5334356 (1994-08-01), Baldwin et al.
patent: 5866053 (1999-02-01), Park et al.
patent: 6322347 (2001-11-01), Xu
patent: 32 03 724 (1982-02-01), None
patent: 297 01 495 (1997-01-01), None
patent: 0 707 935 (1996-04-01), None
patent: 0 818 292 (1997-07-01), None
patent: 0 799 853 (1997-10-01), None
patent: 1 165 301 (2004-02-01), None
patent: 11-034129 (1999-02-01), None
patent: 11-034130 (1999-02-01), None
patent: WO89/00918 (1989-02-01), None
patent: WO95/24440 (1995-09-01), None
patent: WO96/13368 (1996-05-01), None
patent: WO98/08667 (1998-03-01), None
patent: WO98/31521 (1998-07-01), None
Communication of a Notice of Opposition, from EP 1 165 301, dated Nov. 18, 2004.
Patent Abstract of Japan, Publication No. 58197029,Manufacturing of Synthetic Resin Molding, Ube Ind. Ltd., 16.11.83.
Baldwin, Daniel F. “A Processing System for The Extrusion of Microcellular Polymer Sheets: Shaping and Cell Growth Control”, Cellular and Microcellular Materials, 53:85-107, 1994.
Park et al., “Filamentary Extrusion of Microcellular Polymers Using a Rapid Decompressive Element”, Polymer Engineering and Science, 36:34-48, 1996.
Park et al., “Effect of the Pressure Drop Rate on Cell Nucleation in Continuous Processing of Microcellular Polymers”, Polymer Engineering and Science, 35:432-440, 1995.
Kuhns Allan R.
Trexel, Inc.
Wolf Greenfield & Sacks P.C.
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