Fluid bed apparatus for coating solid particles
AssigneeGEA Pharma Systems AG
InventorJürg Paul Ris
Life of this patent
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Abstract
A fluid bed apparatus for coating solid particles. The apparatus includes a housing having upwardly extending walls surrounding a perforated base plate, a nozzle for atomizing a coating liquid, the nozzle being provided in the upwardly extending walls, and a device for providing fluidisation gas through the perforations of the base plate for the maintenance of a fluidised layer. The coating liquid nozzle is provided in a channel for co-current introduction of a dispersion gas, the channel debouching into the fluid bed through an orifice having a radius of 5 mm or more. The apparatus provides for the production of particles having smooth surfaces, high yield and a low tendency to form agglomerates.
Claims16
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.
Dependencies are inferred from the claim text.