Sphere forming method and apparatus

Details Sphere forming method and apparatus Sphere forming method and apparatus

1982-07-30

1983-08-23

Lindsay, Jr., Robert L.

Glass manufacturing

Processes

Self-supporting particle making

65 213, 65 22, 65142, 264 5, 264 12, 264 14, 425 6, 425 7, 425 10, C03B 1910

Patent

active

044001916

ABSTRACT:
A system is provided for forming small accurately-spherical objects. Preformed largely-spherical objects (18) are supported at the opening of a conduit (16) on the update of hot gas emitted from the opening, so the object is in a molten state. The conduit is suddenly jerked away at a downward incline, to allow the molten object to drop in free fall, so that surface tension forms a precise sphere. The conduit portion that has the opening, lies in a moderate-vacuum chamber 40, and the falling sphere passes through the chamber and through a briefly-opened valve (30) into a tall drop tower (32) that contains a lower pressure, to allow the sphere to cool without deformation caused by falling through air.

REFERENCES:
patent: 2500801 (1950-03-01), Church
patent: 2911669 (1959-11-01), Beckwith
patent: 3056184 (1962-10-01), Blaha
patent: 3361549 (1968-01-01), Nakajima
patent: 3961927 (1976-06-01), Alderson et al.
patent: 4017290 (1977-04-01), Budrick et al.
patent: 4279632 (1981-07-01), Frosch et al.
NASA Tech Briefs, vol. 5, #2, Summer 1980, p. 236 Controlling the Shape of Microballoons.

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