Stereolithography using repeated exposures to increase strength

Details Stereolithography using repeated exposures to increase strength Stereolithography using repeated exposures to increase strength

1989-10-31

1990-07-31

Robinson, Ellis P.

Radiation imagery chemistry: process, composition, or product th

Plural exposure steps

430269, 430322, 430945, 365120, 425174, 4251744, 427 531, 427 541, 264 14, 264 22, B29B 1308, B29C 3508

Patent

active

049450328

ABSTRACT:
An improved stereolithographic process is provided in which the formation of a thin walled three-dimensional object in a reservoir of liquid ultraviolet-curable ethylenically unsaturated material using a support is positioned immediately beneath the upper surface of the liquid reservoir with that upper surface being exposed to ultraviolet light in a pattern to solidify the liquid at and near the upper surface in a series of cross-sections of the desired three-dimensional object, one atop the other. In this way there is formed a series of superposed layers which adhere to one another to build the desired three-dimensional object within the liquid reservoir. The improvement comprises, stopping the exposure at any portion of the surface in the formation of said layers and then repeating the exposure at least once again in the production of each surface layer so that the strength and solvent resistance of the formed object are increased and its distortion is minimized. The ultraviolet exposure of each surface layer is preferably carried out as a series of rapid repeated scans of a computer-directed focused laser.

REFERENCES:
patent: 4575330 (1986-03-01), Hull
patent: 4751170 (1988-06-01), Mimura et al.
patent: 4752498 (1988-06-01), Fudim

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