冻干机的次干燥阶段出现真空度下降会对产品造成什么影响?

2025-03-16 05:40:27
推荐回答(2个)
回答1:

影响冷冻干燥过程的几点因素

冷冻干燥技术是将含水物质在低温下冻结,然后在真空条件下

通过对冻干物料加热使冰升华,再除去物料中部分吸附水,得到干

制品。用这种方法制造的药品的特征是:结构稳定,生物活性基本

不变;药物中的易挥发性成 份和受热易变性成 份损失很少;呈多孔

状,药效好;排除了95 99%的水 份,能在室温下长期保存。

然而冷冻干燥也有其缺点和难点:冷冻干燥过程耗时长、耗能

多;冷冻干燥过程对冻干药品和食品的质量有着决定性的影响。冷.

冻干燥过程包括预冷、一次干燥、二次干燥和储存阶段等,都是相.

当复杂传热传质过程;而且这些过程与药品、食品、赋形剂、低温

保护剂的热物性有密切的关系。因此必须弄清楚影响冷冻干燥过程

中传热传质的因素,测定有关材料的热物性,才能制定可靠的程序,

采用优化的冷冻干燥过程,生产出高质量的药品和食品;并可达到

缩短生产时间、节约能耗、降低成本的目的[3~ 6]。

产品的冷冻干燥需要在一定装置中进行,这个装置叫做真空冷

冻干燥机,简称冻干机。冻干机按系统分,由致冷 系统、真空系统、

加热系统、和控制系统四个主要部分组成。按结构分,由冻干箱或

称干燥箱、冷凝器或称水汽凝集器、冷冻机、真空泵和阀门、电气

控制元件等组成。

还有什么问题的,最好找厂家,问问有些细节的问题。冻干机

回答2:

上海田枫冻干机厂家为你回答::
冻干箱的真空度,过去的观点认为真空度是越高越好,现在的观点认为真空度应在一个合理的范围之内。真空度太高了,不利于传热,干燥速度反而下降,但无论如何冻干箱的空载极限真空度应达到15Pa以上。
希望能帮到你!!!!

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