COATING APPARATUS HAVING OPPOSED ATOMIZING NOZZLES IN A FLUID BED COLUMN

摘要

A fluid-bed particle coater having a dual-jet and spray arrangement and including an upstanding column which has an upper cylindrical section, a tapered intermediate section and lower cylindrical section. Depending from the lower cylindrical section is a cylindrical chamber which is inner-connected to tubular sections adapted for introducing multiple air streams via separately controlled inlet openings. The dual-jet and spray construction includes an upwardly-facing spray nozzle positioned in coaxial relationship to the tubular sections and a draft tube, and a downwardly-facing spray nozzle contained with a fountain tube which is disposed above the draft tube. The fountain and draft tubes concentrically intersect about the intermediate section of the column in an opened telescopic arrangement. The dual-jet and spray particle coater provides multiple coating and drying zones and is conveniently adapted with a completely integrated computer control system that provides for automatic and continuous monitoring and control of all fluid flowrates, temperatures and critical pressure measurements throughout the fluidized coating system.