Process to coat granular and powdered materials
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United States of America Patent
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Issued Date -
Feb 13, 2003
app pub date -
Jun 26, 2002
filing date -
Jun 26, 2001
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A process to coat granular through powdered material for particular bulk products that is cost-effective for bulk products and in which the coated product is produced continuously and in a quality and throughput that meets requirements for bulk products is provided. This is attained by the coating material being applied to the granular through powdered material particles in the form of a coating matrix that does not completely envelope the material particles with coating material, with the matrix then being dried and solidified by the process air, the coating material is applied continuously to the bed of material in a continuously operated fluidized bed in at least two different zones. The coating material is applied to the material particles located in the fluidized bed in the form of solutions, suspensions or melts with a solids fraction of 0.5 to 100%, preferably 2 to 20%. The coating materials are preferably inorganic salts, fats, waxes, celluloses, stearates, metals or metal compounds, and the temperature of the air fed to the fluidized bed for the coating area is dependent on the material, and is between -20.degree. C. to +300.degree. C. The end product is continuously discharged from the fluidized bed.
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