Vacuum belt freeze dryer for fruits and vegetables

High value products such as seasonal fruits are freeze dried to maintain its original shape and quality in terms of the flavours, colours and nutrients.

Continuous freeze drying of high value food products

Bucher Unipektins’ Dryband S is a dynamic belt dryer specially designed for freeze drying delicate luxury solid food products such as coffee and tea, seasonal fruits and fish and meats.

During freeze drying water is removed from the product by sublimation under vacuum. Quick frozen products are fed onto the dryer’s belt through a vacuum tight rotary valve and drying is controlled through a combination of belt speed and plate-temperatures. Solids are transported back and forward through the dryer to extend the residence time.

The drying belts feeding rate can range from 2 to 4,000 kg/h and vacuum ranges from 1 to 50 m bar. Heating and cooling surfaces can be achieved up to 325 m2 with a heating ranging between 20 to 180 °C. Freeze-dried fruits and vegetables such as corn and peas maintain its original shape and have a characteristic soft crispy texture.


  • Short drying time due to thin product layer
  • Low residual humidity
  • Fully automized WIP cleaning
  • Minimize loss of volatile oils and flavours

Bucher Unipektin offers vacuum drying, freeze drying and zeodration solutions for the production of valuable concentrates.

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