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Vacuum Tray Dryer

the vacuum tray dryer consists of a square or round vacuum chamber with customized fixed internal shelves; the wet material to be dried is loaded into pans or trays and manually placed on the shelves. The top part of each shelf is flat with a coil jacket on the underside to circulate steam or liquid heating medium for the desired operating temperature.
Due to hundreds of various products and demands of inducing and controlling a vacuum environment, almost all aspects of a vacuum tray dryer's mechanical design and ancillary support equipment can be customized to meet each process design need.

  • FZG
  • 8419399090
  • SUS304/SUS316L/Titanium
  • Food/Pharmaceutical/Chemical

Vacuum Tray Dryer Introduction

The required shelf surface area drives the overall dimension of each vacuum chamber of the vacuum tray dryer. The shelf size, spacing between each shelf, and selected chamber geometry (square or round) will determine the overall chamber size.

Delicate, heat-sensitive materials are dried safely at drying temperatures. Operating under a vacuum, the product is protected from oxidation and atmospheric contamination, and released solvents are fully recovered.

vacuum tray dryers are specified for products requiring uniform, low-temperature drying with no agitation or compression. Among those products are pharmaceuticals, nutraceuticals, vitamin extracts, specialty food items, fine chemicals, and glandular products.

 Vacuum Tray Dryer Video (Lab scale)

Vacuum Tray Dryer Description

FZG Series lab model vacuum tray dryer uses a vacuum pump to damp air out from the interior of the vacuum dryer machine and make the working chamber form vacuum status. and let the raw material be dried at vacuum condition, Therefore, the drying speed of raw material is improved and the energy is saved greatly. Because the raw materials load inside the tray (standard tray size:640x460x45mm, the tray of the vacuum tray dryers also can design as nonstandard machine), It is a static vacuum tray drying machine, and the form and structure of the material can't be damaged when dried. About the heating way of the vacuum dryer, it can use hot water, steam, or conduct oil. The exact heating way will be determined by the client workshop heat source situation. because the interior of the vacuum tray dryer machine is vacuum state. The temperature control is not accurate if testing the vacuum air temperature. So we have two ways to dissolve this issue. It can use a soft cable temperature sensor to test the material's temperature or the client adjust the heat source temperature. Notes: If the material contains a large number of solvents such as methanol, ethanol, etc. The solvent of raw material can be collected by using a condenser. But the condenser to recollected the solvent that needs the user to supply cooling water, If the solvent is water or low proportion of solvents, the condenser is not required in order to save investment cost.

Hywell machine also has the industrial vacuum shelf dryer. Hywell Machinery has the industrial vacuum tray dryer for the factory, please pay attention to hywell company's vacuum shelf dryer.

Vacuum Tray Dryers Specification


Layer of shelf

Qty of tray

Tray size (mm)

Vacuum pump power(kw)















1. Accept non-standard customized vacuum drying oven

1.Hywell machinery reserves the right to the design without notice

2.All specifications are as accurate as is reasonably possible, but they are not   binding.

Vacuum Tray Dryer Application

The vacuum tray dryer is suitable for drying heat sensitive raw materials that can decompose or polymerize or deteriorate at high temperature.

1.    Vcuum tray dryer machine for chemical industry

sodium fluoride, potassium fluoride, basic dyes and pigments, dye intermediates, compound fertilizers, formaldehyde silicic acid, catalysts, sulfuric acid agents, amino acids, white carbon black, etc.

2. Vcuum tray dryer machine for food industry

fat-rich milk powder, gluten, cocoa milk powder, milk replacer powder, hunting blood powder, egg white (yellow), etc.

3.    Vacuum tray dryers for food and plants

oats, chicken juice, coffee, instant tea, seasoning meat, protein, soybean, peanut protein, etc.

4.    Vacuum tray drye for sugars

corn steep liquor, corn starch, glucose, pectin, maltose, potassium sorbate, etc.

Vacuum Tray Dryer Construction Material

Hywell Machinery are able to offer our FZG series Laboratory model vacuum tray dryer with contact part to be built in SS304, SS316L, Titanium, Duplex stainless steel, etc. Electrical parts of control system of the lab scale vacuum tray dryer can be adapted to the customer’s needs.

How do The Vacuum Tray Dryer Works

Pure water has the maximum vaporization rate when it is boiling. Under normal conditions, pure water starts to boil at about 100°C. Under vacuum conditions, because the partial pressure of water vapor in the system is much lower than the partial pressure of water vapor on the surface of the material, the boiling point of water is lower than 100°C. For example: when the surface drops to -0.07MPa, the water starts to boil at 70°C. So despite the lower operating temperature, the small scale vacuum tray dryer still has a larger drying capacity.

Vacuum Tray Dryer Advantages

Hywell machinery FZG series vacuum tray dryer had the following advantages over conventional solutions.

1. Predictable and Repeatable Results.

2. Dry Temperature Sensitive Products

Because all liquids vaporize at lower temperature at reduced pressures, it is possible to vaporize the liquids at very low temperatures.

3. Reduced Energy

Since the evaporation of the liquid under vacuum occurs at a much reduce temperature, the temperature differential is increased without raising the temperature.

4. Single Enclosed Environment

Active pharmaceutical ingredients, drugs and toxic chemicals are easily isolated in a vacuum dryer. The closed system also assures the maximum collection of solvents is achieved, protecting operators and the environment.

5. Avoid Oxidation

Vacuum tray drying oven is ideal for avoiding oxidation of chemical and with the addition of an inert gas purge, an oxygen free environment can be maintained.

6.Static drying process

The materials load inside the tray of the vacuum shelf dryer ,So the shape of raw material to be dried should not be destroyed.


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