METHOD OF VACUUM FREEZING RASPBERRIES Russian patent published in 2024 - IPC A23B7/04 F25D13/00 

FIELD: food industry.

SUBSTANCE: invention relates to food industry, namely to production of frozen raspberries. Method for vacuum freezing of raspberries, characterized by that a product with thickness of 20 mm is frozen in a vacuum-freezing chamber, wherein after 25 minutes, when the temperature on the surface of the product reaches a cryoscopic temperature minus 1.1 °C, then a vacuum pump is turned on, which reduces the pressure in the chamber from atmospheric 101 kPa to 10 Pa at rate of 6 m³/h, and an ultrasonic generator with a radiation frequency of 70 kHz, which is turned off after 20 minutes when the temperature in the product reaches minus 20 °C, and freezing is carried out until the temperature in the product is -40 °C for 25 min.

EFFECT: invention makes it possible to reduce duration of product freezing, to reduce deformation and destruction of internal structure of raspberry.

1 cl, 1 tbl, 4 ex