METHOD FOR VACUUM FREEZING OF FISH Russian patent published in 2024 - IPC A23B4/06 F25D13/00 

FIELD: food industry.

SUBSTANCE: invention relates to food industry, namely to production of frozen fish. Method for vacuum freezing of fish, characterized by that a product with height of 50 mm is frozen in a vacuum-freezing chamber, is characterized by that after 60 minutes, when temperature on product surface reaches cryoscopic -1.8 °C, a vacuum pump is turned on, which reduces the pressure in the chamber from atmospheric 101 kPa to 10 Pa at rate of 15 m³/h, and an ultrasonic generator with a radiation frequency of 70 kHz, which is turned off after 25 minutes when the temperature in the product reaches -20 °C, and freezing is carried out until the temperature in the product is -40 °C for 30 minutes.

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

1 cl, 1 tbl, 4 ex