Tray Dryer And Dehydrator Machine

A tray dryer is a batch-operated chamber that uses heated air circulated by fans to remove moisture from solid materials stacked on trays. Often used in pharmaceutical and food industries for delicate products, it operates through forced convection, with 80-90% air recirculation for efficiency. Tray dryers (or dehydrators) are ideal for low-volume production.

Key Details and Components Structure: A insulated, double-walled chamber featuring rack tracks, heaters (electric or steam), fans, and air inlets/outlets.Trays: Materials are spread on solid, perforated, or wire mesh trays, which can be removed for cleaning.Working Principle:Heating: Air is drawn in and heated by steam coils or electric heaters.Circulation: Fans move hot air at 2-5 m/s across the tray surfaces.Evaporation: Heat induces moisture to evaporate from the surface, while moisture within the solid diffuses to the surface by capillary action.Exhaust: Moisture-laden air is partially exhausted, with fresh air added to maintain efficiency. Operating Characteristics Batch Mode: Suitable for small-scale,, or specialized production.Temperature Control: Often equipped with PID controllers to manage temperatures within (pm 1-2^{circ }C).Time Factor: Drying can take several hours depending on the product. Advantages and Disadvantages Pros: Versatile (handles granules, powders, pastes, solids), gentle drying for heat-sensitive materials, precise control, and ability to handle multiple products at once.Cons: High labor for loading/unloading, low efficiency for large-scale, and long, slow drying cycles. Applications Pharmaceuticals: Drying granules for tablets/capsules.Food Industry: Dehydrating fruits, vegetables, herbs, and spices.Chemicals/Ceramics: Processing pigments and specialized powders.