真空冷冻干燥是把含有大量水分的物质预先冷冻，使物质中的游离水结晶，冻结成固体，然后在高真空条件下使物质中的冰晶升华，待冰晶升华后除去物质中部分吸附水，最终得到残留水量为１％～４％左右的干制品。用该方法生产出来的食品称之为真空冷冻干燥食品（简称为冻干食... Vacuum freeze-drying is the pre-freezing of the material containing a large amount of water, so that the material in the free water crystallization, frozen solid, and then under high vacuum sublimation of ice crystals in the material to be sublimated ice crystals to remove some of the material to absorb water, and ultimately The residual water is about 1% to 4% of the dried product. Food produced by this method is called vacuum freeze-dried food (referred to as lyophilized food ...