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。
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.
影响冻干角膜效果的因素涉及方方面面，诸如保护剂系统，预冻温度，降温速率，冷冻干燥条件等。
There are a lot of factors that affect the quality, such as protective agent, freezing temperature, freezing rate, freeze - drying conditions.
LGJ-25型冷冻干燥机集预冻、冻干功能于一体， 干燥箱为钟罩式结构，搁板选用电加热方式。
LGJ-25 frozen- dryer assembles two functions of pre-freeze and freeze-drying. The chamber selects the structure of the bell glass. The shelves are heated by electricity.
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