Fluid bed
With fluid bed coating, particles are fluidized and the coating is sprayed
on and dried.
Formyl microgranules
under electronic microscope
This process can be used for general coatings right up to enteric coating. With top spray coating the fluid bed particles are fluidized in a flow of heated air, which is introduced into the product container via a base plate. The coating liquid is sprayed into the fluid bed from above against the air flow (counter-current) by means of a nozzle.
Drying takes place as the particles continue to move upwards in the air flow.
Small droplets and a low viscosity of the spray medium ensure that the
distribution is uniform. FORMYL and FORMAXOL are
products manufactured using this technique.
- Characteristics of the coated products:
-
- Low abrasion, smooth surface
- Good flow behaviour
- Masking of taste and smell
- Protection against light, air and moisture
- Systematic release of active ingredients
- Delayed dissolving
- Low hygroscopicity
- Visual attractiveness
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