Shanghai Bilang manufactures a refrigerating dryer manual.
Freeze-drying is an excellent drying method. Under dry conditions, the dried product can be stored for a long period of time without additives at room temperature. The structure of the freeze-dried product is porous and crisp, and the water is rehydrated quickly when used. The color, fragrance, taste, shape and activity of the articles after rehydration are basically unchanged, and are especially suitable for food, health care products and pharmaceutical industries.
What should be paid attention to when using the freeze dryer:
01. Under normal circumstances, the machine must not be used continuously for more than 48 hours;
02, must ensure that the sample is completely frozen into ice, otherwise it will cause the residual liquid to be converted into a gaseous state to produce a spray;
03, the cold trap temperature is about -65 ° C, can replace the low temperature refrigerator, but in order to prevent frostbite must wear warm gloves to operate;
04. If the outlet valve is tightened or not and the inflation valve is closed, it must be checked before starting the vacuum pump. Also, pay attention to whether the contact surface of the plexiglass cover and the rubber ring is clean and free of dirt and seal well;
05. Expand the surface area of ​​the prepared sample as much as possible. The sample should not include organic solvents containing acids and bases and volatiles;
06. During the freezing of the sample in the freeze dryer, the temperature will gradually decrease. At this time, the sample that is still in the frozen state can be taken out for a while and then dried, which can shorten the drying time.
There are many types of freeze dryers, such as -50 ° C / normal type, -50 ° C / gland type, -50 ° C / hanging bottle type, -50 ° C / gland hanging bottle type, -50 ° C / strain preservation type, -80 ° C / normal type, -80 ° C / gland type -, 80 ° C / gland hanging bottle type, -80 ° C / strain preservation type and so on.
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