Introduction

Being one of the widely used equipment to produce solid preparation in pharmacy production filed, fluid bed pelletizing machine is the ideal choice for pelletizing, powder mixture and drying process. It mainly produces pellet medicine such as troche, capsule, and granule in pharmaceuticals, food and chemical industry, etc.

Technical Synopsis

Top spray

Materials in the trough flow upward into drying chamber with the drive of bottom-up airflow. As the movement diameter increases and the flowing rate reduce, materials fall back into trough with gravity. Flowing circle runs again repeatedly with irregular flowing state.

Features

Due to reverse spraying, the route of droplet is long.

Application

1.Drying and spray drying;
2. Pelletizing;
3. Producing instant particles;
4. Coating. 

Bottom spray

Combined with fluidization and pneumatic conveying, ascent area in ​​the center and the fluidization area around draft tube are formed. Due to fast gas velocity in ascent area, powders are in a highly decentralized state and bonding is effectively prevented. Ascent area is formed from the center to the extension chamber with the push of bottom-up airflow and descending area is formed while materials’ gravity overcomes the decreasing flow drive and fall back to the outer round of annulus area. Reciprocating flow cycle between the center and the outer round of annulus area turns the random fluidization into a regular one.

Features

1.Spraying to the same direction with spray nozzle buried in materials, the route of the droplet is short;
2.Fluidized particles flow through the injection fog with equal probability;
3.Particles are dense in spraying area.

Application

(1)Powder coating: 1. Water solution of molecular polymeric material, film coating of organic solvent;  2.Slow release  

coating and controlled release coating;  3. Enteric coating;  4. Fine particle coating;  5. Active drug coating.

(2) Particles (pellets) coating: Certain intensity, small surface area, few micropore and compact surface.

Tangent spray

Combined with rotating fluidized bed and tangential spray, materials in trough moves like spiral strand with the force of centrifugal force, airflow driving force and gravity. For each single powder, the track is almost constant.

Features

1. Spraying to the same direction with the spray nozzle buried in the material, the route of the droplet is short:

2. Fluidized particles flow through the injection fog with equal probability;

3. Dense particles in spraying area.

Application

1. Pelletizing: Smooth surface pills with high sphericity are made with materials’ rotation and revolution in centrifugal bed and mutual friction effect;

2. Pellet coating;

3. Production of large particles: granularity can reach 20 to 80;

4. Dense granules.

Structural Sketch Map of Fluid Bed System

1. Prefilter  2. Dehumidifier 3. Steam Separator  4. Heater  5. Finefilter 6. Pump 7. Spray Nozzle 8. Product Filter

9. Explosion-relief Port 10. Off-gas Deduster 11. Silencer P、Differential Pressure gauge D、Powder Leak Sensor

T、Fast Valve