What are the stages of the freeze-drying process of the freeze-drying machine

                                          What are the stages of the freeze-drying process of the freeze-drying machine

The freeze-drying process of the freeze-drying machine is divided into the following stages:

Lyophilizer is a technology that uses the principle of travel to carry out monotony. It is to quickly freeze the monotonous material at low temperature, and then make the frozen water molecules directly travel into the process of water vapor escape in an appropriate vacuum environment The product obtained by the lyophilizer is called lyophilized material, and this process is called lyophilization.

The quality requirements of freeze-dried products are: unchanged biological activity, uniform appearance color, full shape, vigorous structure, fast dissolution rate and low residual water. In order to obtain high-quality products, we should have a comprehensive understanding of the theory and technology of freeze-drying. The freeze-drying process of freeze-drying machine includes three stages: pre freezing, traveling and re freeze-drying. Reasonably and effectively shortening the freeze-drying cycle has significant economic value in industrial production.

1. Turn on the main power switch on the left side of the freezer case, and the air pressure digital display is atmospheric pressure 110pk; 2 press and hold the general opening key on the control panel of the refrigerator for more than three seconds, and the temperature digital display is the actual temperature of the cold trap; 3. The refrigerator shall be pre cooled for more than 30 minutes; 4 put the sample into the sample rack, cover the plexiglass cover, and support the vacuum pump; 5 after the air pressure digital display is stable, record the temperature and air pressure values. Shutdown of freeze dryer 1 record the temperature and air pressure values before shutdown; 2 press and hold the charging valve on the control panel of the refrigerator and turn off the vacuum pump immediately; 3. When the air pressure digital display is atmospheric pressure, open the plexiglass cover and take out the sample; 4 turn off the refrigerator, press and hold the main switch for more than three seconds, Zui then turn off the main power switch; 5 after the ice in the cold trap is completely turned into water, open the water outlet valve on the left side of the chassis to drain water, clean the inner wall of the cold trap with a dry cloth, and cover a large piece of filter paper to prevent dust.