预冻是指干燥前将物料进行冻结。可采用的冷冻方法有高速冷空气接触法、液氮喷淋法等。
预冻干燥在原位进行，减少干燥过程的繁锁操作，实现了自动化；
The process of pre-freezing and drying finishes in situ, so it changes the complicated operation and automates the dry process.
这对于防止目前许多冻干产品的盲目预冻结而造成的能源浪费，具有一定的指导意义。
It's instructively meaningful to present waste of energy sources by blindness prefreeze for many freeze-dried products.
由以下步骤组成：物料准备、预冻、真空条件下升华干燥和解 吸干燥，最后密封保存。
The method comprises the following steps of: preparing and prefreezing materials, drying the materials by sublimation and desorption under vacuum, and hermetically conserving the materials.
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