Am Heegwald 11 · 76227 Karlsruhe · Germany

Solutions for Coating Big Particles

All Romaco Innojet solutions for coating big particles are based on the air flow bed technology originally developed and internationally patented by Dr. h.c. Herbert Hüttlin. This method optimises the fluidisation of solid particles and creates flow conditions that enable extremely gentle intermixing of the product. The air flow bed technology provides significant benefits for our customers compared to conventional drum coating facilities.

Characteristics of the Air Flow Bed Technology

  • Gentle product flow owing to the orbital, and hence controlled, flow of process air
  • Particles float freely without any friction because the product hovers, resulting in rapid, and above all even, coating with the material
  • Shorter processing times combined with excellent, reproducible product quality


  • Uniform flow conditions inside the product container
  • Constant ratio of the relative air flow per batch volume to the number of process air supply gaps in the container bottom
  • Different nozzle lengths allow scalable dosing of the spray quantity
  • Nozzle designed with a spraying gap: the gap length can be varied but the geometry remains constant
  • Stable droplet sizes regardless of the spray volume
  • Defined break-up zone in the process container results in two counter-rotating air flow beds
  • Effective distribution of the product
  • Spray nozzles and container bottom form an innovative functional unit
  • Cost efficient solution because spray loss is reduced to a minimum
  • Processing times reduced by up to 75% compared to conventional drum coating facilities
  • Multilayer coating: seamless sequence of individual spraying steps
  • Continuous in-process control ensures reproducible product quality
  • Reliable processing even of highly friable products
  • Efficient coating of complex geometries as well as products with a hollow structure
  • Product filled and emptied without dust or contamination

The AIRCOATER® and VARIOSCALE® series are available as laboratory, pilot or production scale equipment and deployed successfully in the pharmaceutical, food and chemical industries.