The seed powder moves upward from the hopper to the diffusion chamber under the thrust of the airflow. Due to the large diameter of the diffusion chamber and the low air flow velocity, when the material overcomes the thrust of the airflow due to its own gravity, it falls down and forms a fluidized state in a reciprocating manner. But the fluidized state is irregular and not strictly controlled. This is different from bottom spray and tangent spray.

The liquid medium is transported into the system through an atomization system, and is atomized into extremely small droplets by a nozzle, which are sprayed from top to bottom in the opposite direction of the material's movement. The liquid bridge built by the surface tension of the liquid medium binds the powder materials together, forming a continuously expanding volume and ultimately forming particles of a certain size.

The process of particle formation is as follows:

The main application areas of top spray are as follows

Drying application field

Used for rapid drying of materials

Granulation application field

Reduce powder

improve liquidity

By granulation, the distribution of active substances of different components can be made more uniform

Improve the compressibility of tablet particles

Improve the density of the product

Improving the solubility of particles in the field

Increase dispersion

The particles are porous instant granules

Coating application field

Oil coating

Flavor masking coating

Moisture resistant and antioxidant coating

Colored coating

The main technical parameters are as follows