Plastic and nonmetallic article shaping or treating: processes – Formation of solid particulate material directly from molten...
Patent
1986-04-30
1991-10-08
Theisen, Mary Lynn
Plastic and nonmetallic article shaping or treating: processes
Formation of solid particulate material directly from molten...
65 214, 75331, 75338, 75340, 75342, 264 12, 264 13, 264 15, 425 6, 425 7, B29B 910
Patent
active
050552406
ABSTRACT:
A method is described for forming hollow particles, or shells, of extremely small size. The shell material is heated to a molten temperature in the presence of a gas that is at least moderately soluble in the shell material, to form a solution of the molten shell material and the soluble gas. The solution is atomized to form a multiplicity of separate droplets that are cooled while in free fall. Cooling of a droplet from the outside traps the dissolved gas and forces it to form a gas bubble at the center of the droplet which now forms a gas-filled shell. The shell is reheated and then cooled in free fall, in an environment having a lower pressure than the gas pressure in the shell. This causes expansion of the shell, to form a shell having a small wall thickness compared to its diameter.
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Lee Mark C.
Schilling Christopher H.
Wang Taylor G.
Adams Harold W.
Jones Thomas H.
Manning John R.
The United States of America as represented by the Administrator
Theisen Mary Lynn
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