METHOD FOR MANUFACTURING ROTATION-SYMMETRIC ARTICLES BY CENTRIFUGAL CASTING
First Claim
2. Method as defined in claim 1, wherein at least one fluid phase in addition to the rotating liquid is rotated therewith to form the mold and said fluid phase is specifically lighter than the rotating liquid and the cast liquid, said rotating liquid, cast liquid and fluid phase constituting three substantially immiscible phases of properly graduated density.
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Abstract
The invention concerns centrifugal casting of articles which solidify either by a chemical reaction or by physical solidification, wherein a cast liquid is brought into contact only with at least one shaping liquid, or, if desired, also with a gas phase, at least one of the shaping liquids being specifically heavier and the other shaping liquid or liquids being specifically lighter than the cast liquid, all the liquids forming a sharp boundary with each other. Thus, any contact of the cast liquid with a solid phase such as with the wall of the rotating container is excluded and the cast article is shaped only by centrifugal force, gravity and surface tension.
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Citations
8 Claims
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2. Method as defined in claim 1, wherein at least one fluid phase in addition to the rotating liquid is rotated therewith to form the mold and said fluid phase is specifically lighter than the rotating liquid and the cast liquid, said rotating liquid, cast liquid and fluid phase constituting three substantially immiscible phases of properly graduated density.
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3. Method as defined in claim 2, wherein the specifically lighter fluid phase is a gas.
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4. Method as defined in claim 1, wherein there are present two specifically lighter fluid phases in addition to the rotating liquid and are rotated therewith to form the mold, said fluid phases being specifically lighter than the rotating liquid and the cast liquid, said fluid phases consisting of a liquid phase and a gas phase and forming with the rotating liquid and casting liquid four substantially immiscible phases or properly graduated density.
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5. Method as defined in claim 4, wherein the most dense liquid forms the mold and wherein the second most dense liquid constitutes the casting liquid.
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6. Method as defined in claim 1, wherein said cast liquid constitutes a monomer or mixture thereof capable of being polymerized during said rotation.
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7. Method as defined in claim 1, wherein said rotation symmetric article formed is an optically homogeneous transparent body.
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8. Method as defined in claim 7, wherein said article is an optical lens.
Specification