METHOD FOR VACUUM DRYING OF GRAPES Russian patent published in 2022 - IPC F26B3/30 F26B5/04 F26B7/00 

FIELD: food industry.

SUBSTANCE: invention relates to the food industry, namely the production of dry grapes. In the proposed method, the grapes are dried in a single layer by infrared rays at a temperature of 40°C by alternating three injection-vacuum cycles, with the injection cycle coming first. In the evacuation cycle, the residual pressure is 6.5 kPa, and its duration is 60-100 minutes, in the first injection cycle, the overpressure is 30 kPa, and in subsequent ones, 40-50 kPa, the duration of this cycle is 3 minutes. In the injection cycle, dry air with a relative humidity of not more than 5% is injected into the chamber.

EFFECT: invention makes it possible to obtain a high-quality dry product with a pronounced characteristic taste, a homogeneous consistency with a moisture content of not more than 5% without damaging the berry shell.

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