What Is a Fluid Bed Dryer Filter?
A Fluid Bed Dryer (FBD) filter is a special filter bag assembly used in fluid bed dryers, which are machines commonly used in pharmaceutical, chemical, and food industries to dry powders and granules efficiently.
🔍 Key Features of FBD Filters:
| Feature | Description |
| Shape | Cylindrical filter bags, stitched into a plate |
| Material | Antistatic, food-grade fabric like polyester or polypropylene |
| Mesh Size | Fine filtration to retain powder and liquid but allow air to pass through |
| Top Plate | Usually plastic or metal, fits into the drying machine |
| Design | Multiple bags stitched together — usually 12, 14, 16, or more per plate |
How It Works in a Fluid Bed Dryer:
- Hot air is pushed from the bottom of the dryer to dry wet granules or powders.
- The filter bags are installed at the top to trap fine particles and allow only clean air to escape.
- Prevents product loss and maintains hygiene standards.
- Some filters include shaking or pulsing mechanisms to knock off powder build-up.
Common Applications:
- Pharmaceutical granulation drying
- Powder drying in food processing
- Chemical granule drying
![bag filter / pocket filter [65% 85% 95%]](https://aliairfilters.com/wp-content/uploads/2025/07/BAG-FILTER-_-POCKET-FILTER-95_-YELLOW-300x300.png)
