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?

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

Operation Process of Freeze Dry Machine

The amount of water vapor in the compressed air is determined by the temperature of the compressed air: Reducing the temperature of the compressed air reduces the amount of water vapor in the compressed air while maintaining the constant pressure of the compressed air, and the excess water vapor condenses into a liquid.Freeze Dry Machine uses this principle with refrigeration technology to dry compressed air. Therefore, the Freeze Dry Machine has a refrigeration system.

The refrigeration system of the Freeze Dry Machine is a compression type refrigeration system consisting of four basic components: a refrigeration compressor, a condenser, an evaporator, and an expansion valve. They are connected by a pipe connection to form a closed system in which the refrigerant circulates continuously in the system, undergoes a state change and exchanges heat with the compressed air and the cooling medium.

The refrigeration compressor draws the low-pressure (low-temperature) refrigerant in the evaporator into the cylinder of the compressor, and the refrigerant vapor is compressed, and the pressure and temperature are simultaneously increased; the high-pressure high-temperature refrigerant vapor is pressed to the condenser, and in the condenser, The higher temperature refrigerant vapor exchanges heat with the cooler water or air, and the heat of the refrigerant is taken away by water or air to condense, and the refrigerant vapor becomes a liquid.

This part of the liquid is then sent to the expansion valve, which is throttled into a low-temperature and low-pressure liquid through the expansion valve and enters the evaporator; in the evaporator, the low-temperature, low-pressure refrigerant liquid absorbs the heat of the compressed air and vaporizes (commonly called „evaporation”) The compressed air is cooled to condense a large amount of liquid water; the refrigerant vapor in the evaporator is sucked away by the compressor, so that the refrigerant undergoes four processes of compression, condensation, throttling, and evaporation in the system, thereby Completed a loop.

In the refrigeration system of the Freeze Dry Machine, the evaporator is a device for conveying a cold amount, in which the refrigerant absorbs the heat of the compressed air to achieve the purpose of dehydration and drying. The compressor is the heart and acts to draw, compress, and deliver refrigerant vapor.
GuanFeng supplies different kinds of freeze drying machines. High quality and favorable price. We′re pleased to get your Inquiry and we will come back to as soon as possible. If you interested in our products, please feel free to contact us any time:

Zhejiang Guanfeng Food Machinery Co.,Ltd.

Add : South industrial park of Dongguan, Shangyu District, Shaoxing City, Zhejiang Province, China 312352

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Drying Speed (Freeze Dyring Machine)

In the drying process of fruits and vegetables, the speed of Frozen Solution plays an important role in the quality of dried fruits and vegetables. What will affect the drying speed when fruits and vegetables are dried? When the other conditions are the same, the faster the drying speed, the better the quality of dried fruits and vegetables. Of course, the drying speed is also limited by other factors, such as temperature, humidity, air flow rate, and characteristics of fruits and vegetables.

1. Temperature and relative humidity of dried fruits and vegetables

The temperature and humidity of the drying medium determine drying speed. The higher the drying temperature, the lower the humidity, the faster the water evaporates, and the faster the drying speed. However, for some products, the temperature is too high, but it will form a reaction, affecting the quality. Conversely, with is low temperature, the drying time is prolonged, and the product is prone to oxidative discoloration or even mildew. According to the relevant experiments, for higher water content, the drying temperature can be maintained higher, and later adjustments should be made, combined with internal and external diffusion. For fruits and vegetables with low water content, it is not advisable to use excessively high temperatures to avoid splitting, coking, and crusting of the epidermis. Different temperatures are chosen for different fruits and vegetables, generally 40-90°C. Suitable equipment for drying at this temperature are: belt dryer, dehydrated vegetable dryer, hot air circulation oven, new oven, vacuum dryer.

2, Air Flow Rate

The air flow rate is large, and the fruits and vegetables dry quickly. Some fruits and vegetables need to increase the wind speed, and the drying time is shortened accordingly, and the quality is good.

3. Types and status of fruits and vegetables

The variety of fruits and vegetables differs in physical properties and structure, and the drying speed is different under the same conditions. According to the evaporation amount, moisture, color, etc., it is generally possible to slice, diced, and cut the difficult-to-dry materials to obtain better quality and optimum drying speed.

GUANFENG specializes in the production and sales of Vacuum Freeze Dry Machine, Freezing IQF, as well as Fruit Processing Machine, Vegetable Processing Machine, Food Processing Machine equipment. As a professional Freeze Dry Machine Manufacturer , we sincerely invite you to pay a visit to a brilliant future! Contact us by click

Drying Technique of Freeze Dry Machine

Drying technique is used on the Freeze Dry Machine uses by the principle of sublimation. It freezes the dried material at a low temperature and then directly sublimates the frozen water molecules into water vapor under a suitable vacuum environment. The product obtained by lyophilization is called a lyophilizer, and the process is called lyophilization.

The substance is always in a low temperature (freezing state) before drying, and the ice crystals are evenly distributed in the substance, and the sublimation process does not cause concentration due to dehydration to avoid side effects such as foaming and oxidation caused by water vapor. The dry material is porous in the shape of a dry sponge, and the volume is basically unchanged, so it is easily soluble in water and restored to its original state. Physical and biological denaturation of dry matter is prevented to the greatest extent.

The Freeze Dry Machine is composed of a refrigeration system, a vacuum system, a heating system, and an electrical instrument control system. The main components of the lyophilizer are a drying oven, a condenser, a refrigeration unit, a vacuum pump, and a heating/cooling device.

The lyophilizer works by freezing the dried object to below the triple point temperature and then sublimating the solid water (ice) in the article to water vapor under vacuum conditions, removing it from the products, and drying the products. After the material is pre-treated, it is sent to the quick-freezing bin for freezing, and then sent to the drying bin for sublimation dehydration, and then packaged in the post-treatment workshop. The vacuum system establishes a low-pressure condition for the sublimation drying chamber. The heating system provides sublimation latent heat to the material, and the refrigeration system provides the required cooling capacity to the cold trap and the drying chamber.

GUANFENG specializes in the production and sales of Vacuum Freeze Dry Machine, Automatic Continuous Multistage Belt Dryers(AD), Freezing IQF, as well as Fruit Processing Machine, Vegetable Processing Machine, Food Processing Machine equipment. We sincerely invite you to pay a visit to a brilliant future!

As a professional freeze drying machine and Vegetable Processing Machine manufacturer, we welcome international customers to discuss cooperation, we will provide warm and thoughtful service for you. Contact us today to begin sourcing or go to my webiste for further more information.

Advantages And Applications of Freeze Dry Machine I

Freeze Dry Machine adopts the working principle of cooling condensation, mainly composed of three parts: heat exchange system, refrigeration system and electrical control system. The compressed air first enters the pre-cooler for heat exchange of gas or gas, removes part of the heat and then enters the hot and cold air exchanger and exchanges cold air that has cooled from the evaporator to the pressure dew point for heat exchange to make the temperature of the compressed air Further decrease.


After that, the compressed air enters the evaporator and exchanges heat with the refrigerant. The temperature of the compressed air drops to 0-8*C, and the moisture in the air is precipitated at this temperature, separated by the gas-water separator, and discharged through the automatic drainer. The dry, low-temperature air enters the hot and cold air exchanger for heat exchange, and is output after the temperature rises.

The Freeze Dry Machine uses physical principles to freeze the moisture in the compressed air below the dew point to make it from the air.

Freeze Dry Machine in the precipitation limites to the freezing point temperature of water, theoretically its dew point temperature can be close to 0 degrees. In fact, the dew point temperature of a good freeze dryer is generally about 5 degrees.

Traditional drying destroys the cells and causes the material to shrink. The structure of the sample is not destroyed during the freeze-drying process because the solid component is supported by the firm ice on its seat. If the ice sublimes, it will leave pores in the machine in the remaining material, which preserves the biological and chemical structure of the product and the integrity of activity.

As a professional freeze drying machine and Vegetable Processing Machine manufacturer, we welcome international customers to discuss cooperation, we will provide warm and thoughtful service for you. Contact us today to begin sourcing or go to my webiste for further more information.

Advantages of GF Freeze Dry Machine

There are various drying methods such as sun drying, boiling, oven drying, spray drying, and vacuum drying, but ordinary drying methods are usually carried out at temperatures above 0℃. The products dried will shrink the size and harden the texture. Most of the volatile components are lost, some heat-sensitive substances are denatured and deactivated, and some substances are even oxidized. Therefore, the dried product has a large difference in properties compared with that before drying. The Freeze Dry method is basically carried out below 0℃, that is, in the state where the product is frozen, and only when the residual moisture content of the product is lowered in the later stage is the temperature above 0℃, but generally, it does not exceed 40℃. Under vacuum conditions, when the water vapor is directly sublimated, the drug remains in the frozen ice shelf, forming a sponge-like porous structure, so the volume after drying is almost constant. Before using it again, as soon as you add water for injection, it will dissolve immediately. GF Freeze Dry Machine has some advantages over other machines.

  • * Many heat-sensitive substances will not be denatured or inactivated.
  • * When dried at low temperatures, some of the volatile components in the material are lost.
  • * During the freeze-drying process, the growth of microorganisms and the action of enzymes cannot work, so that the original traits can be maintained.
  • * Since it is dried in a frozen state, the volume is almost constant, with the original structure, and concentration does not occur.
  • * Since the moisture in the material exists in the form of ice crystals after pre-freezing, the inorganic salt-soluble substances originally dissolved in water are evenly distributed in the material. During the process of sublimation, the substances dissolved in water are precipitated, which avoids the phenomenon that the inorganic salt carried by the internal moisture migration to the surface in the general drying method is precipitated on the surface to cause surface hardening.

As a professional manufacturer and supplier of Freeze Dry Machine, GuanFeng welcome new and old customers, friends from various circles at home and abroad to visit and join hands to create a better future! Click gf-machine or for furhter more information.