FOOD MACHINERY WITH VACUUM COOLING FUNCTION AND ITS OPERATING METHOD

摘要

PROBLEM TO BE SOLVED: To provide a food machinery capable of preventing overcooling and insufficient cooling of foodstuff, and performing vacuum cooling free from unevenness in temperature. SOLUTION: A pressure reducing means 3 sucks and discharges a gas in a processing tank 2 to reduce a pressure in the processing tank 2. A pressure recovering means 4 introduces the outside air to the pressure-reduced processing tank 2 to recover the pressure in the processing tank 2. A pressure sensor 5 detects the pressure in the processing tank 2. A temperature sensor 6 detects a temperature of the easily-cooled foodstuff 12 or an easily-cooled part of the foodstuff received in the processing tank 2. The pressure in the processing tank 2 is reduced by the pressure reducing means 3 until the temperature sensor 6 detects a cooling target temperature T1. Then an opening of a pressure recovering operation valve 28 is adjusted while operating the pressure reducing means 3 to keep the pressure in the processing tank by the pressure sensor 5 at a saturated steam pressure corresponding to a cooling retention temperature T2. COPYRIGHT: (C)2009,JPO&INPIT