Plastic and nonmetallic article shaping or treating: processes – Carbonizing to form article – Agglomeration or accretion
Patent
1991-05-17
1993-09-28
Tentoni, Leo B.
Plastic and nonmetallic article shaping or treating: processes
Carbonizing to form article
Agglomeration or accretion
118 57, 118423, 118429, 118620, 118712, 134 32, 134 34, 134 61, 134 82, 134113, 134137, 134184, 134198, 156 64, 1562735, 1562755, 1563071, 156378, 1563796, 156538, 264 37, 264 401, 264 69, 264233, 264308, 264341, 264343, 425135, 4251744, 425404, 425445, 427 8, 427508, 427541, 427553, 427560, B29C 3508, B29C 4102
Patent
active
052484564
ABSTRACT:
An improved stereolithographic apparatus and method is described. In one embodiment, the improvement includes immersing at least a portion of a part in a volume of a liquid solvent in a vapor degreaser while subjecting the portion to ultrasonic agitation to substantially remove excess resin. Several examples of solvents are provided, including ethanol, and Freon TMS. In a second embodiment, the improvement includes building the part on a layer of liquid resin supported by a volume of a dense, immiscible, and UV transparent intermediate liquid, and integratably immersing at least a portion of the built part in the intermediate liquid, and then either subjecting the immersed portion to ultrasonic agitation to substantially remove excess resin, or subjecting the immersed portion to UV light. Several examples of intermediate liquids are provided, including perfluorinated fluids, such as Fluorinert FC-40, and water-based salt solutions, such as solutions of magnesium sulfate or sodium chloride in water.
REFERENCES:
patent: 4575330 (1986-03-01), Hull
3D Systems, Inc. Technical Tip: Improved Method of Cleaning Stereolithography Parts Using Rolla-Strip (Jun. 1990), published in the United States.
Temple, S. D., Products Finishing, A New Era For Aqueous Cleaning, pp. 76-83 (Mar. 1990), published in the United States.
Ertley Ernest W.
Evans, Jr. Herbert E.
Hull Charles W.
Leyden Richard N.
3-D Systems, Inc.
Tentoni Leo B.
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