Liquid nitrogen freezing has made its debut in the U.S.A. along with the growth of space industry and, today, it is spreading rapidly as a characteristic method of freezing.
Although it has not been long yet since the liquid nitrogen freezing was introduced into this country, a considerable number of units have already been put into commercial operations and the range of application for foods is being expanded gradually.
In this report, the writer intends to explain about the liquid nitrogen freezing, i.e. growth history, theory of freezing, freezing systems and features.
