Plastic and nonmetallic article shaping or treating: processes – Carbonizing to form article – Agglomeration or accretion
Patent
1993-11-01
1995-08-15
Tentoni, Leo B.
Plastic and nonmetallic article shaping or treating: processes
Carbonizing to form article
Agglomeration or accretion
264321, 264322, B29C 3302, B29C 3343, B29C 4302
Patent
active
054416752
ABSTRACT:
The molding apparatus includes a press (10) with a top mold (12) and a bottom mold (14). The top mold (12) has a die (32) with a contoured die surface (34) and gas passages (36). The bottom mold (14) has a die (44) with a contoured die surface (46). The die (44) is made from either a solid piece of material with gas passages or from a porous material. During operation, a workpiece (26) is placed in a mold cavity (24). The mold cavity (24) is closed to shape the workpiece. The workpiece is heated by hot gas supplied by a gas supply and recirculation system (52) when the diverter valves (68 and 70) are opened and gas flows from gas circulation fan (56) to the gas heater chamber (54) to the bottom mold (14), through the die (44), through the workpiece (26), through the die (32) and back to the inlet side of the gas circulation fan (56). When the workpiece (26) has been heated to the desired temperature for the required time, the diverter valves (68 and 70) are closed. When the diverter valves are closed, gas flows through the gas recirculation duct (62) from the gas heater chamber (54) to the inlet of the gas circulation fan (56). The mold cavity (24) is then opened and the workpiece (26) is removed and an unformed workpiece is placed in the mold cavity to repeat the cycle.
REFERENCES:
patent: 4162877 (1979-07-01), Nyberg
patent: 4263007 (1981-04-01), Battigelli et al.
patent: 4462785 (1984-07-01), Smith
patent: 4689004 (1987-08-01), Kunkel
patent: 4786351 (1988-11-01), Elliott et al.
patent: 4850849 (1989-07-01), Hsu
patent: 4923555 (1990-05-01), Elliott et al.
patent: 5096409 (1992-03-01), Stofko
Davidson Textron Inc.
Tentoni Leo B.
LandOfFree
Forming method and apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Forming method and apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Forming method and apparatus will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2179733