| 摘要 |
PURPOSE:To perform dehydration treatment of a raw material with a hot oil filled in a cooker in a short time under optimum condition by controlling the oil temperature according to the evacuation condition of the cooker. CONSTITUTION:Wastes of animal, fish and shellfish are charged as a raw material into a cooker, etc. The oil filled in the cooker is heated to 80-120 deg.C at first, the cooker is evacuated to 10-60mmHg (i.e. absolute pressure of 700-750mmHg) in the above state and the pressure in the cooker is further lowered according to the lowering of the oil temperature. The evacuation is further proceeded to evacuate the cooker to almost vacuum state when e.g. 30min is lapsed after the charge of the raw material and, at the same time, the oil temperature is lowered to balance the pressure and the temperature. The thermal coagulation of gelatin, water-soluble protein, etc., in the raw material tissue can be improved by this process to enable the dehydration of the core part of the raw material to the water-content same as that of the surface part. |
