Vacuum Tray Dryer
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Vacuum Tray Dryer are used where heating and drying are essential parts of manufacturing process in industries such as Chemicals, Dye stuff, Pharmaceutical, Food Products, Colors etc. Vacuum Tray Dryer is suitable for drying of thermal sensitive material easily deteriorated under higher Temperature. It eliminates configuration damage of the drying materials.

Bodies may be of cylindrical or rectangular cross section. Both shelves and body are heated (the body to prevent internal condensation) with controlled circulation of hot water, steam or dia thermic fluid. Vacuum is drawn through large diameter ducts to minimize pressure drops and produce minimum working pressures. Both rotary and static dryers can be supplied with the following Optional ancillaries.

  • Heater system for either pressurized hot water or dia thermic fluid.
  • Cyclones and sleeve filters for powder recovery (for rotary dryers)
  • Solvent recovery system with condenser and receiver, vacuum pump and ancillaries, characteristics and dimensions depending on the drying processes.

Vacuum tray dryer working principle

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 dimension 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-condensate 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.


Model VTD6 VTD12 VTD18 VTD24 VTD36 VTD48 VTD96
Number of Trays 6 Trays 12 Trays 18 Trays 24 Trays 36 Trays 48 Trays 96 Trays
No. of shelves 6 6 6 8 12 16 32
Dummy Shelves 1 1 1 1 1 1 2
Trays per shelves 1 2 3 3 3 3 3
Housing Construction Mild Steel / Stainless Steel 304 / 316 / 316L
Doors Mild Steel / Stainless Steel w/ inter lock & glass wool insulation
Hinges Stainless Steel
Heating Material Water / Fluid
Heating Shelves SS /Hollow Pad Type, baffled for essential heat transfer
Trays Food Grade Stainless Steel
Tray Size 16 x 32 x 1.25 (inch)
Insulation Thick glass wool
Controls PID Controller
Vacuum gauge Dial type located on vacuum chamber
Temperature Indicator Digital
Pressure release valve Yes
Vacuum break valve Yes
Limit Switch Yes
Optional – Circulation pump with FLP Motors and controls
– Vacuum Pump (2stage water ring) consisting FLP motor
– PLC controller
– Nitrogen purging valve
– Validation ports w/ sensors
– Condenser-Shell & tube type
– Condensate Receiver
– Viewing glass
– Shell & tube type condenser
– IQ / OQ / DQ / PQ Certifications
Certifications CE, ISO, cGMP

We involve in designing and producing vacuum tray dryers that are used in laboratory, pharmaceutical, food, and cosmetic industries. With a team of professionally talented engineers we provide custom design facilities to its customers and they are welcome to discuss their requirements including vacuum tray dryer design, size, number of trays, required temperature, optional accessories etc. We are promising full customer satisfaction and unmatched quality service. All these units are supplied with full installation, commissioning and training at customers’ workplace. We also export our vacuum tray dryer equipment to all over Asian, African and Middle East countries at factory price.