Method for producing uniform spherical shells

Plastic and nonmetallic article shaping or treating: processes – Formation of solid particulate material directly from molten... – Coated particles

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264 9, 264 14, 264 23, 264 28, B29C 2300

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043223788

ABSTRACT:
The disclosure is directed to a method for producing relatively uniform hollow spheres of a substance, the hollow spheres being formed with a gas therein as a result of the production process. The spheres, formed for example of hydrogen isotopes, are particularly useful as a fuel target for laser fusion applications. In accordance with the method of the invention, a jet of the substance of which the spheres are to be formed is provided in liquid form. Relatively uniform gas bubbles are injected into the liquid jet. In this manner, the bubbles break up or separate the liquid jet into relatively uniform hollow spheres of the substance, each with a bubble of the gas inside. The hollow spheres can be visualized as liquid droplets, each having a relatively uniform gas bubble therein. In accordance with a feature of the invention, a periodic mechanical disturbance, such as is obtained by exciting an ultrasonic transducer, is introduced to a gas stream, and tends to cause the gas stream to form relatively uniform bubbles within the liquid droplets.

REFERENCES:
patent: 2510574 (1950-06-01), Greenhalgh
patent: 3060510 (1962-10-01), Fischer et al.
patent: 3389194 (1968-06-01), Somerville
patent: 3985841 (1976-10-01), Turnbull et al.
patent: 4013744 (1977-03-01), Kuerten

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