Kambic Vacuum Dryers

We offer high-performance dryers in three chamber sizes with a maximum operating temperature of 200 °C. If required, this range also provides the base models upon which a variety of custom modifications can be made.

Vacuum drying is the transfer in which the moisture present in a substance (usually a wet solid body) is removed by vacuum generation. In the chemical process industries such as food, pharmacy, agriculture, textile, paper & pulp, and many others, drying is an essential requirement for the removal of moisture.

Vacuum drying is generally used to dry hygroscopic and heat-sensitive substances and is based on the principle of creating a vacuum that lowers the pressure to below the vapour pressure of the water. Using vacuum pumps, the pressure around the material to be dried is reduced. This reduces the boiling point of the water inside the product and thus significantly increases the evaporation rate. The result is a significantly increased drying rate of the product.

In the pharmaceutical industry, the vacuum dryer is known under the common name vacuum oven. The oven door is hermetically sealed by a high-quality silicone gasket and connected to a vacuum pump to reduce pressure.

Besides Vacuum Dryers, we also offer Drying/Warming ovens and Freeze Dryers.
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Drying in a vacuum up to 1 mbar with heated shelves:

Evaporation at low temperatures

Determination of drying curves

Dry matter evaluation

Vacuum drying pilots

Key Features of Vacuum Ovens

• Heated shelves and PID control
• Vacuum brake valve
• Valve for controlled leakage and low-pressure valve
• Needle valve for intake or discharge of inert gas
• AISI 304 stainless steel chamber, polished to Ra 0.5m with fast door closing mechanism
• and highly resistant food-grade silicone gasket
• Chamber door with overpressure relief valve Safety-window for monitoring the drying process
• Microprocessor control with LCD display
• 10 different automatic programs or manual control

Oil vacuum pumps are the most frequently used types and the most favourable in price. They can easily achieve a vacuum as low as 1 mbar, sometimes even lower. They are robust and very durable if properly maintained, however, there are some drawbacks. Oil vacuum pumps are usually not chemical-resistant, making a steam condenser necessary when used for drying aggressive media. Otherwise, these aggressive media can damage vital parts of the pump, the oil quality can drastically deteriorate, requiring a regular change of oil and the pump will require more frequent cleaning.

This pump is chemical-resistant and enables aggressive media to dry, as it is 'dry-running' and does not use oil for lubrication. This considerably extends the maintenance intervals. The membrane pump has a standard, in-built glass liquid collector on the exhaust duct, which prevents the condensed liquid from entering the pump. There is also a pair of in-built insulated glass condensers on the exhaust side, which can be cooled with water, and thereby providing efficient condensation and collection of exhaust fumes.
No oil lubrication also means no oil fumes left in the exhaust. Despite the multi-stage construction, the vacuum can reach down to 2 mbar.