| 摘要 |
<P>PROBLEM TO BE SOLVED: To increase a consumption effect by imparting an additional value such as the suppression of the lowering of freshness to a frozen food by improving a freezing process of the frozen food. <P>SOLUTION: In the freezing process, a closed pace to be cooled in freezing equipment (for example, the inside of a contact freezer chamber) is brought into a vacuum state by using a vacuum pump, a moisture is removed, next, a nitrogen gas is injected into the freezer chamber, the inside of the freezer chamber is filled with the nitrogen gas, and a portion at which the food is coated with the nitrogen gas is frozen. A temperature at freezing is set at 40°C below the freezing point, and a freezing storage temperature is set at 35°C below the freezing point. As machines for implementing the freezing process, there are employed the vacuum pump which draws out air from the closed space to be cooled of the freezing equipment, and a nitrogen injection device which injects the nitrogen gas into the closed space which is reduced in pressure by the operation of the vacuum pump. <P>COPYRIGHT: (C)2012,JPO&INPIT |
