Tips for using a universal vacuum freeze-drying machine

The universal vacuum freeze-drying machine has the advantages of maintaining quality, high dehydration rate, long storage time, fast drying speed, wide application range, safety and environmental protection, and is one of the standing equipment for drying treatment in the fields of pharmaceuticals, food, chemical industry, etc.
Tips for using a universal vacuum freeze-drying machine:
Preparations: Before starting the machine, check whether the equipment is in good condition, whether the liquid nitrogen is sufficient, and whether the vacuum pump works normally. At the same time, it is necessary to prepare the substances and drying containers that need to be dried.
Loading samples: Place the substances that need to be dried into a drying container, taking care not to exceed the capacity of the container.
Freezing: Place the drying container into the equipment and activate the freezing system to freeze the substance in the condenser. The freezing time is usually several hours, and the specific time needs to be determined based on the characteristics of the dry substance and the size of the container.
Decompression: After freezing, turn on the vacuum system to reduce the pressure in the equipment to a certain range, in order to facilitate subsequent sublimation. The specific pressure needs to be determined based on the characteristics of the dry substance and the size of the container.
Sublimation: Under reduced pressure, turn on the heating system to evaporate the frozen water through sublimation and extract it by the vacuum system. The sublimation time is usually several hours, and the specific time depends on the characteristics of the dry substance and the size of the container.
Product collection: After sublimation is completed, turn off the heating and vacuum systems, restore atmospheric pressure, remove the drying container, and collect the dried product.
Cleaning equipment: After drying, it is necessary to clean the inside of the equipment thoroughly for future use.
Record experimental data: During use, it is necessary to record experimental data, such as freezing, decompression, sublimation time, weight and form of dried substances, for reference in the next use.