Patent ID: 8863686
Filing Date: 2014-10-21
Classification: B01J,B05C,Y10S

Abstract:
1. A fluid bed apparatus for coating solid particles, comprising a housing having upwardly extending walls surrounding a perforated base plate; means for providing fluidisation gas through perforations of the base plate for the maintenance of a fluidised layer of particles in the housing; a displaceable coating nozzle for pressurized atomization of coating liquid, said coating nozzle being provided in at least one of the upwardly extending walls in a channel, the coating nozzle and channel providing co-current introduction of a dispersion gas and coating liquid droplets, the channel debouching into the housing through an orifice having a radius of 5 mm or more via a transition area concentrating gas prior to entry into the fluidised layer, and wherein the coating nozzle is retractable within the channel relative to the orifice to provide dispersion gas assistance in distribution of coating liquid droplets prior to exiting the channel followed by collision with fluidised particles in the housing.