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The basic principle of the freeze-drying work of the freeze-drying machine is that under the condition of high pressure and vacuum, the sublimation principle is used to make the water in the pre-frozen material sublime directly into the water vapor state in the vacuum level without melting the ice.
Take off, make the material dry, and the vacuum freeze-dried product can ensure that various nutrients such as protein and vitamins in the food, especially those volatile and heat-sensitive components, are not lost
.
The four-ring freeze-drying experimental freeze-drying machine freeze-drys a substance containing a large amount of water, freezes it into a solid in advance, and then evaporates the water vapor directly under vacuum conditions, while the substance itself remains in the frozen ice.
In the rack, so it does not change its volume after drying, and the loose pores absorb heat when it is raised
.
After drying by the freeze dryer, the volume and shape remain unchanged, and the rehydration is good, which can better preserve the items and prolong the shelf life
.
However, the freeze dryer must be sterilized before use, and do not bring bacteria into food or other dry items, otherwise it will lead to serious consequences
.
Four-ring freeze-drying experimental freeze-drying machine equipment sterilization process: 1.
Drying: The freeze-drying chamber (front chamber) and condensation chamber (back chamber) are heated and vacuumed for drying
.
2.
Vacuuming: Vacuum the freeze-drying chamber (front chamber) and condensation chamber (back chamber) to facilitate the injection of hydrogen peroxide gas and ensure the uniform distribution of hydrogen peroxide gas during the sterilization stage
.
3.
Sterilization: Inject hydrogen peroxide gas into the chamber to reach a specific value and hold for a period of time (Note: According to needs, vacuum and hydrogen peroxide gas can be injected multiple times during the sterilization stage)
.
4.
Residual discharge: After the sterilization is completed, the concentration of vaporized hydrogen peroxide is reduced after repeated vacuuming and venting, until the residual reaches the safety target
.
Take off, make the material dry, and the vacuum freeze-dried product can ensure that various nutrients such as protein and vitamins in the food, especially those volatile and heat-sensitive components, are not lost
.
The four-ring freeze-drying experimental freeze-drying machine freeze-drys a substance containing a large amount of water, freezes it into a solid in advance, and then evaporates the water vapor directly under vacuum conditions, while the substance itself remains in the frozen ice.
In the rack, so it does not change its volume after drying, and the loose pores absorb heat when it is raised
.
After drying by the freeze dryer, the volume and shape remain unchanged, and the rehydration is good, which can better preserve the items and prolong the shelf life
.
However, the freeze dryer must be sterilized before use, and do not bring bacteria into food or other dry items, otherwise it will lead to serious consequences
.
Four-ring freeze-drying experimental freeze-drying machine equipment sterilization process: 1.
Drying: The freeze-drying chamber (front chamber) and condensation chamber (back chamber) are heated and vacuumed for drying
.
2.
Vacuuming: Vacuum the freeze-drying chamber (front chamber) and condensation chamber (back chamber) to facilitate the injection of hydrogen peroxide gas and ensure the uniform distribution of hydrogen peroxide gas during the sterilization stage
.
3.
Sterilization: Inject hydrogen peroxide gas into the chamber to reach a specific value and hold for a period of time (Note: According to needs, vacuum and hydrogen peroxide gas can be injected multiple times during the sterilization stage)
.
4.
Residual discharge: After the sterilization is completed, the concentration of vaporized hydrogen peroxide is reduced after repeated vacuuming and venting, until the residual reaches the safety target
.
