Freeze-drying operation of four-ring freeze-drying experimental freeze-drying machine

 Vacuum freeze-drying is an ideal method for material dehydration.
It can keep the original active ingredients and nutrients of the material unchanged.
After drying, not only the color, aroma, taste and shape of the product will remain unchanged, but also after being stored for several years, the rehydration will remain unchanged.
It can maintain its original flavor and active ingredients, and this technology is widely used in the pharmaceutical industry, biological research, nutritional health products, specialty foods and other industries
.

The actual working nature of the four-ring freeze-drying experimental freeze-drying machine is that it can directly sublimate the solvent from the solid sample to the gaseous state to achieve the purpose of drying
.

In order to achieve a better freeze-drying effect, we need to pay attention to the proper operation method in practical work: the pre-freezing of materials is a key step in the freeze-drying process, and the quality of the pre-freezing process directly affects the quality of freeze-dried products
.

The material pre-freezing process can basically be divided into slow freezing and rapid freezing.
Users can flexibly operate the equipment according to specific needs to achieve effective pre-freezing of materials
.

Such as: 1.
Slow freezing: put the pre-prepared materials into the cold trap, cover the insulation cover, turn on the compressor, and start the pre-freezing; 2.
Quick freezing: turn on the compressor first, and wait for the temperature of the cold trap cavity to drop to a certain temperature , and then put the pre-prepared materials into the cold trap, and the pre-freezing starts; the freeze-drying operation of the four-ring freeze-drying experimental freeze-drying machine On the hard plastic disc (both are placed above the cold trap cavity), and then cover the plexiglass cover.
If the lidding device is used to freeze-dry the material, after the material is pre-frozen, the material is quickly transferred from the pre-freezing rack to the lidding device.
on the shelf, and then cover the plexiglass cover for the lid
.

2.
The system is running on the equipment operation screen, press the "vacuum pump" button, the vacuum pump will work, press the "vacuum gauge" button, the vacuum degree will be displayed, when the vacuum degree reaches about 30Pa, press the "heating" button to start the freeze-drying process program, and drying starts Run according to the preset process program
.

Note: The zero point of the vacuum degree has been adjusted, and the user does not need to calibrate it; after the vacuum gauge is turned on, the atmospheric state is displayed as 110×103～80×103Pa, which are normal and do not need to be adjusted
.

Suggestion: During the freeze-drying process, turn on the vacuum gauge only when you need to check the vacuum level, and turn off the vacuum gauge when not checking, which can prolong the service life of the vacuum gauge
.