Method and apparatus for producing concentric hollow spheres

Details Method and apparatus for producing concentric hollow spheres Method and apparatus for producing concentric hollow spheres

1979-05-08

1981-07-21

Lindsay, Jr., Robert L.

Glass manufacturing

Processes

Self-supporting particle making

65 22, 65142, 264 5, 264 9, 264 24, 425 6, C03B 1910

Patent

active

042796326

ABSTRACT:
Hollow spheres with precisely concentric inner and outer spherical surfaces are formed by applying vibrations to a nonconcentric hollow sphere while it is at an elevated temperature at which it is fluid or plastic, the vibrations producing internal flows which cause the inner and outer surfaces to become precisely concentric. Concentric spheres can be mass produced by extruding a material such as glass or metal while injecting a stream of gas into the center of the extrusion to form a gas-filled tube. Vibrations are applied to the extruded tube to help break it up into individual bodies of a desired uniform size, the bodies tending to form spherical inner and outer surfaces by reason of surface tension, and the continuing application of vibrations causing these surfaces to become concentric.

REFERENCES:
patent: 2392072 (1946-01-01), Vang
patent: 3744983 (1973-07-01), Jenkins
patent: 3955956 (1976-05-01), Terner
patent: 3985841 (1976-10-01), Turnbull et al.
patent: 4162282 (1979-07-01), Fulwyler et al.
PCT/US79/00621 Torobin, published 3/1980 priority 8/28/78.
PCT/US/79/00651 Torobin, published 3/1980 priority 8/28/78.

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