Stereolithography method and apparatus

Details Stereolithography method and apparatus Stereolithography method and apparatus

1989-06-12

1992-09-01

Tentoni, Leo B.

Plastic and nonmetallic article shaping or treating: processes

Carbonizing to form article

Agglomeration or accretion

34 4, 34 9, 34 12, 34 33, 34 37, 34149, 34164, 34179, 34180, 34189, 34236, 118 57, 118423, 118429, 118620, 134 1, 134 12, 134 31, 134 32, 134 61, 134 63, 134 82, 134 83, 134137, 134184, 134186, 134195, 1562735, 1562755, 1563071, 1563796, 264 23, 264 69, 264232, 264233, 264308, 264340, 4251742, 4251744, 425404, 425445, B29C 3508, B29C 4102

Patent

active

051436639

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: 2856638 (1958-10-01), Schulken, Jr. et al.
patent: 3723120 (1973-03-01), Hummel
patent: 4575330 (1986-03-01), Hull

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