Vacuum Tray Dryer
Standard models range from 3 trays to 96 trays.
Vacuum tray dryers are used for drying of high-grade temperature and oxygen-sensitive products. Highly suitable for drying hygroscopic substances which are dried to very low residual moisture content levels. Frequently vacuum drying cabinets are the sole possibility for drying lumpy, glutinous products or products of low pomposity.
We are a vacuum tray dryer manufacturer, supplier, and exporter as per ISI guidelines. We have fulfilled every customer’s requirements since 1990 from India and all over the globe.
Vacuum tray dryer is the most commonly used batch dryer. They are either box-shaped or cylindrical shaped loaded and unloaded via a door. Inside this contains several heating plates mounted one above the other on which the product is placed in trays. The Top of both heating plates (Shelves) and the bottom of heating shelves trays should be as smooth as possible to permit optimal heat transfer between plates and products. The medium flowing through the heating plates is water, steam, or thermal oil. The distance between the heating plates is determined primarily by the surface loading and the foaming of the product. To avoid retrograde condensation, the cabinet walls are indirectly preheated by limpet coil provided on the outer side of the body (Optional). Only after all the product trays reach the same temperature, the cabinet is evacuated and drying can start. (The preheating phase is very important in order that the drying curve and the foaming of the product are identical throughout the cabinet). During the main drying phase, the vacuum is in the range of 40 to 80 mbar abs and in the final drying phase, the vacuum of only a few mbar abs is reached. The vacuum can be controlled through PLC in order to reduce the drying cycle. Nitrogen can also be purged in the VTD according to the product.
The dimensioning of the vacuum system is an important factor in the design of drying cabinet systems. If for example vigorous foaming of the product is desired, evacuation to the operational vacuum level must take place very quickly. Vapors produced during drying are taken out directly to a surface condenser in which the vapors condenses. Non-condensable vapors are extracted by the vacuum system. On completion of the drying, the product can be cooled by circulating cooling water through the heating plates.
Vacuum tray dryers manufactured by Promas Engineers with watering vacuum pump & high vacuum Rotary oil ring Pump provides an edge over the other manufacturers of vacuum tray dryers. We are the best pharmaceutical machinery manufacturers in India and so the advantages that you get are –