Method of generating a spherical grain
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United States of America Patent
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Aug 9, 1988
Grant Date -
N/A
app pub date -
Mar 24, 1986
filing date -
Mar 23, 1985
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The invention relates to a process for producing a spherical grain shape in fine grain toners. The toners are of the type used in electrophotography for developing latent charge images. The treatment of the toner takes place in a material bed which is fluidized by gas streams which are directed against one another. In this manner the grains are subjected to a multitude of reciprocal collisions and friction stress. The intensity of the collisions and frictional stress are adjusted through selection of the operating pressure, velocity, direction and temperature of the gas streams. Thus the grains undergo permanent deformation. A classifier to separate out the super-fine portion resulting from abrasion.
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