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冻干果蔬奶片的基本原理的介绍

编辑:山东格雷特农业科技有限公司时间:2019-08-01

  与其他干燥方法一样,为了保持升华干燥,应该达到两个基本条件,即持续供热和持续除去蒸汽产生,在初始阶段,如果材料温度相对较高,升华所需的潜热可由材料本身的显热导出。然而,随着升华,果蔬奶片温度速度下降到与干燥室内蒸汽分压平衡的温度。此时,如果没有外部加热,升华干燥将停止。在外部加热的情况下,如果没有及时除去升华产生的蒸汽,蒸汽的分压将会升高,材料的温度也会升高,当物料达到0点时,物料中的冰晶融化,就没进行冻干了。

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