Fluid bed coating 

Fluidised beds are used to coat particles that are considerably finer than those treated inside coating drums. The process has been specially adapted for the application of protective films which are specifically used, e.g. to release active agents, to act as a gastro-resistant layer, to mask tastes, to improve the product's appearance or even to improve its shelf life and storage stability.



  • improves flowability
  • lowers risk of separation
  • reduces volume of particulate matter
  • increases bulk density
  • lowers hygroscopicity

Basic principle

In this process hot air is evenly injected into the fluidised bed, keeping the product in a suspended state. Whilst suspended in air, the particles are covered with the coating fluid using a very fine spray which is applied using a two-substance nozzle. The injected air causes the fluid to evaporate and dries the layer of film. This allows several layers of the film to form, creating a homogeneous, stable coating around the separated particle.

  • Three- & Four-Substance 946, 0/56

    Circular full-coneRead more
  • Two-Substance - 940

    External mixing - circular full-coneRead more
  • Two-Substance - 970

    External mixing - circular full-coneRead more


  • Say Goodbye to Blockages

    Use of anti-bearding cap nozzles in fluidised bed systems

    Blocked spray nozzles are a widespread problem in fluidised bed systems in which very fine or tacky products are processed. By using ABC nozzles, the pharmaceutical excipient manufacturer DMV Fonterra Excipients has succeeded in avoiding unplanned downtimes. Düsen-Schlick Anti-bearding cap technology (ABC nozzles) is well-established in the field of tablet coatings.

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