Advantages of Vacuum Freeze Dry Machine

Freeze-drying technology, as a drying technology, freezes water-bearing substances into a solid state and then sublimate the water from solid state to gaseous state to remove water and preserve the substance.

During drying compressed air, freeze drying is carried out by lowering the temperature of the compressed air to precipitate moisture in the compressed air. The freeze dryer (cooler) works like a refrigerator. After the compressed air passes through the frozen compressed air line, the temperature of the compressed air drops to the required temperature to meet the drying requirements.

The Lyophilization originated in the 1920s vacuum freeze-drying technology after several decades of ups and downs and made great progress in the last 20 years. In the 21st century, vacuum freeze-drying technology has become more and more popular with people due to the advantages unmatched by other drying methods. In addition to its wide application in the fields of medicine, biological products, food, blood products, and active substances, its application scale and field is expanding. Therefore, vacuum freeze drying of freeze dry machine will be an important application technology in the 21st century.

Vacuum freeze-drying method has the following advantages:

First, The dried material is porous and spongy. After adding water, it dissolves quickly and completely, and almost immediately restores its original character.

Second, Since drying of freeze dry machine is carried out under vacuum, there is very little oxygen, so some easily oxidizable substances are protected.

Third, Drying can remove 95%~99% of water so that the products can be preserved for a long time without deterioration.

Last, because the material keeps in a frozen state, with low temperature, so the heater with normal temperature or low temperature can meet the requirements. If the freezing chamber and the drying chamber are separated, the drying chamber does not need to be insulated, and there is not much heat loss, so the utilization of heat energy is economical.

However, vacuum freeze-drying technology is expensive. Because it requires a vacuum and low-temperature conditions, the vacuum Freeze Dry Machine is equipped with a vacuum system and a low-temperature system, so the investment cost and running cost are relatively high.

Several Q&A of Freeze Dry Machine

How Does Freeze Dry Machine Work?
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Here’s the official definition of freeze drying (Lyophilization) of Freeze Dry Machine

from the FDA:

So, how do we do that at home?

First, you get a heavy duty Freeze Dry Machine (the Harvest Right units drop to -30°F (-34°C) or colder).

Second, you pair this up with a completely airtight chamber that can hold a vacuum (no oxygen) every single time you use it.

Third, you tie in a high end vacuum pump strong enough to suck the stripes off a zebra.

Fourth, you add a heater and thermostat, so you can cycle the temps up and down, repeating the sublimation process for hours on end.

Fifth, tie in a humidity sensor to make sure the water is out, triggering the cycle completion.

What foods can you freeze dry?

Fruits, vegetables, meats, dairy products, meals, desserts, and more. Freeze drying is safe for preserving cooked pasta and grains, unlike canning.

What foods can’t you freeze dry?

Anything that’s mostly fat or mostly sugar will not freeze dry well. Fat won’t dry – but it can heat up and melt in the unit and coat every surface. When I tried pre-cooked pork sausage patties, they made a big mess.

Sugar binds to water, trapping it in the food. This is great for inhibiting bacteria growth, but it means you can’t freeze dry jams and jellies that are mostly sugar. Plain fruit and most desserts are fine.

How long does freeze drying take?

Around 24 hours was the estimated freeze drying time for an average load, but with the new software, I’ve freeze dried loads in as little as 13 hours. Warm, humid conditions increase drying time.

When you load up your home freeze dry machine and hit “Start”, the unit takes you through a short menu. You select whether the food going in is already frozen (or not), and whether it is solid or liquid. Then the Freeze Dry Machine prompts you to close the drain valve and begin the cycle. More information about freeze dry machine click gf-machine