Precursors : • Coarse powders • Granulates • Bulk materials

Process

Coating comprises applying a surface layer to particles with a functional film former. To do so, the precursors are fed into the plant, fluidised in the air flow and sprayed with film-forming liquids. Water-soluble and hydrophobic coating materials can be chosen:

  • Aqueous solutions, suspensions or emulsions
  • Melts
  • Melt emulsions or melt suspensions

The process can change the surface structure of the precursors to achieve a particular effect. Macroscopic particles from 150–200 µm (up to 5 mm) can be individually and gently coated.

Protection

Sensitive raw materials are therefore efficiently protected – against external influences such as moisture and atmospheric oxidation on the one hand, against internal influences from other components with the same formulation on the other hand. The environment can also be protected against aggressive components in this way.

Desired Release

The coating helps to control where, when and over what period of time the particles are released. This allows them to unfold their full and optimal effect. A specific mechanism is activated with the respective desired effect, depending on which coating material is selected:

Controlled Release
At a certain location or time, the coating material is rendered permeable or even caused to dissolve, for example, by changing the temperature or pH value or by adding specific trigger elements (e.g. enzymes).

Slow Release
The coating material ensures that the active substances are released continuously. This is achieved by means of semi-permeable diffusion by coating systems that are insoluble in water.

Advantages

  • Homogeneous distribution of the coating material
  • Protects particles from external influences
  • Protects particles from internal incompatibilities
  • Protects the environment from particles
  • Specific “controlled-release” mechanisms
  • Controlled semi-permeable diffusion (“slow release”)
  • Improved storage stability
  • Particles suitable for tablet pressing (direct compression)
  • Free design of your product (hygroscopicity, solubility, flowability, surface structure, smell, visual appearance, etc.)