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

Lyophilization Technology of Vacuum Freeze Dryer

Lyophilization of a Vacuum Freeze Dryer was used to prepare tissue samples for structural studies (eg, electron microscopy studies). Freeze drying is also used in chemical analysis to obtain dried samples or to concentrate samples to increase analytical sensitivity. Freeze-drying stabilizes the sample components without changing the chemical composition, making it an ideal analytical aid. Freeze drying can occur naturally. In the natural case, this process is slow and unpredictable. Through the freeze-drying system, people have improved and subdivided many steps to speed up the process.
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Bell-type Vacuum Freeze Dry Machine: The freeze-drying chamber and the cold trap are upper and lower structures, and the freeze-drying chamber has no pre-freezing function. This type of lyophilizer requires manual operation when it is transferred to the drying process after the material has been pre-frozen. Most of the experimental Freeze Dry Machine are bell-type, with a simple structure and low cost. Most of the freeze-drying chambers use a transparent plexiglass cover to facilitate the observation of the lyophilization of the material.

In-situ freeze-drying machine vacuum freeze-drying machine: the freeze-drying chamber and the cold trap are two independent chambers, and the shelf in the freeze-drying chamber has a cooling function. After the material is placed in the freeze-drying chamber, the material is pre-frozen and dried. The process does not require manual operation. This type of freeze dryer has a complicated manufacturing process and high manufacturing cost, but the in-situ freeze dryer is the development direction of the freeze dryer, an ideal choice for lyophilization process, especially suitable for medicine, biological products and other special products.

Ordinary shelf type vacuum freeze-drying machine: The material is bulk-packed in the material tray and is suitable for lyophilization of food, Chinese herbal medicine and powder materials.

Vacuum lyophilizer with gland type device: suitable for drying of bottled materials in Xilin. When lyophilized, prepare the materials in the vials as needed, float and cover the caps, freeze-dry them, and operate the gland mechanism after drying. The bottle cap can be pressed to avoid secondary pollution, re-adsorb moisture, and easy to store for a long time.

Principle and Structure of Vacuum Freeze Dryer

The food vacuum Freeze Dry Machine not only maintains the freshness and nutrition of the food, but also prolongs the shelf life of the food. What is the principle and composition of the Vacuum Freeze Dryer ?

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The vacuum Freeze Dry Machine is a drying technique in which a wet material or a solution is frozen to a solid state at a lower temperature and then the water therein is directly sublimated into a gaseous state without being liquid, and finally the material is dehydrated.

The Principle of Food Vacuum Freeze Dryer principle

The constant supply of heat and the continuous elimination of steam generation. In the initial stage, if the material temperature is relatively high, the latent heat required for sublimation can be taken from the sensible heat of the material itself. However, as the sublimation progresses, the temperature of the material quickly drops to a temperature equilibrium with the vapor partial pressure of the drying chamber. At this time, if there is no external heating, the sublimation drying stops. In the case of external heating, if the steam generated by sublimation is not eliminated in time, the partial pressure of steam will increase and the temperature of the material will increase. When the material freezes, the ice crystals in the material will melt. Freeze drying will not work.

The structure of Food Vacuum Freeze Dry Machine

(1) The drying box has two main forms of cylindrical and square, each having advantages. The cylindrical shape is easy to manufacture, but the space that cannot be utilized is large; the square is opposite, the space utilization rate is high, but manufacturing is difficult.

(2) Most of the heating system uses radiation heat transfer. The radiant panel is made of anodized aluminum. The heat transfer medium has heat transfer oil, saturated water, secondary steam, organic solvents such as propylene glycol, glycerin, etc. The heat source is high pressure water vapor.

(3) The vacuum system adopts mechanical vacuum pump, including Roots pump + oil seal pump and Roots pump + Roots pump + atmospheric injection + water ring pump. More information 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.

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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

In-depth information click gf-machine

Vacuum And Hydraulic System of GF Lyophilization Equipment

The moisture in the product can be sublimated quickly only under vacuum to achieve the purpose of drying. The vacuum system of Lyophilization Equipment consists of a freeze-drying box, a condenser, a vacuum valve, a vacuum pump, a vacuum line, and a vacuum measuring component.

The system of Lyophilization Equipment uses a vacuum pump set to form a powerful suction capacity, forming a vacuum in the drying chamber and the condenser, on the one hand, causing the water in the drying chamber to evaporate under vacuum. The vacuum degree of the vacuum system should match the sublimation temperature of the product and the temperature of the condenser. If the degree of vacuum is too high or too low, it is not conducive to sublimation. The vacuum degree of the drying box should be controlled within the set range. Shortening the sublimation cycle of the product, the premise of vacuum control is that the vacuum system itself must have a small leakage rate. The vacuum pump has a large enough power reserve to ensure that the ultimate vacuum is reached.

The hydraulic system of Lyophilization Equipment is a special device that presses the stopper into the bottle mouth at the end of freeze drying. The hydraulic system is located at the top of the drying box and is mainly composed of an electric motor, an oil pump, a check valve, a relief valve, a solenoid valve, a fuel tank, a cylinder and a pipe.

At the end of Lyophilization, the hydraulic plugging system starts to work, and under vacuum conditions, the upper shelf is slowly moved downward to complete the product bottle stoppering task. The hydraulic oil pump station, oil cylinder, etc. are installed in the top of the freeze-drying tank. Under the drive of the hydraulic pump station, the plate layer is lifted up and down in the tank to facilitate the entry and exit of the tank and the cleaning work.

The seal of the lower part of the piston rod of the cylinder uses O-type silicon. The rubber seal ensures that oil will not be contaminated and the drug will be contaminated. The piston uses a YX polyurethane seal. The electromagnetic reversing valve and the hydraulic balancing valve are accurate in signal transmission, and do not slip without vibration. Click gf-machine for in-depth information about GF Machinery.

Drying Box of GF Lyophilization Equipment

The drying oven is one of the important components in the Lyophilization Equipment, and its performance directly affects the performance of the entire Lyophilization Equipment. The freeze-drying box of Lyophilization Equipment is a rectangular or drum type, which can be cooled to about -40C. It can be heated to a vacuum-sealed high and low temperature box body of about +50C.

The bottom of the cabinet is slightly inclined to the rear, and the drain is designed at the lowest point to facilitate drainage.

The freeze-drying of the product is carried out in a dry box, in which there is mainly a shelf on which the product is placed.

The shelves are made of stainless steel with media ducts distributed inside to cool or heat the product.

The laminar components are installed in the freeze-drying box through the bracket, and are driven by the hydraulic piston rod to move up and down, which is convenient for feeding and discharging and cleaning.

The uppermost layer is a temperature-compensated stiffener that ensures the same thermal environment for all products in the box.

The freeze-drying box of Lyophilization Equipment can be installed with the wall of the sterile room. The door is sealed with a special shape silicone rubber strip to seal the door to the same finish as the inside of the freeze-drying box. The material of the door is also made of high-quality stainless steel. It has the same smoothness and flatness as the inside of the freeze-drying box. It can be closely attached to the sealing strip to ensure the sealing under vacuum. The opening angle of the box door of the freeze-drying box is >110 degrees, and the observation window is installed in the center of the door to facilitate the observation of the state of the product in the sterile room.

Our company would like to sincerely invite the global prospective customers to pay a visit and have a good cooperation for a splendid future together. If you interested in GF Machinery, please contact us by click gf-machine

3 Factor of IQF Freezing Technology

First, the effect of cooling medium temperature. Under the process conditions of IQF Freezing Machine , the lower the temperature of the cooling medium, the faster the product freezes under the same conditions. At present, according to the specific situation in China, most of the ammonia is used as a refrigerant, and the evaporation temperature is generally selected between -35 and -45 °C. Under the IQF process, if a forced air continuous freeze is used, the temperature of the cooling medium is also related to the frosting speed of the evaporator. That is, when the evaporating frost layer reaches a certain thickness, the temperature of the cooling medium is correspondingly increased due to a decrease in the heat transfer effect. Therefore, in order to ensure the quality of the frozen, it should be done in time to defrost.

Second, the effect of air flow rate

Under the IQF Freezing process, the air flow rate is the main factor affecting the value of the exothermic coefficient. Therefore, an appropriate increase in the air flow rate can increase the degree of freezing end. For example, the common green beans freeze in the static air of -30°C, which takes about 2 hours. At the same temperature, the air flow rate increases to 4.5-5 m/s, and the freezing time is only 10 minutes.

Under certain conditions, the change between the freezing speed and the air flow rate is not linear, so the air flow rate should be comprehensively determined from an economic point of view.

Third, the effect of freezing termination temperature

The freezing termination temperature is lower than the storage temperature (-18 ° C), which is beneficial to maintain the structure under rapid freezing. If the freezing termination temperature is higher than -18 °C, the unfrozen water inside the vegetable tissue will generate large ice crystals, which will result in the destruction of the tissue structure and the increase of juice loss during thawing, which will affect the nutritional value and flavor of the product. If you are interested in learning more about freezing IQF, please click gf-machine

Do You Know IQF Freezing

Individual Quick Freezing usually abbreviated Freezing IQF is a freezing method used in food processing industry. Products commonly frozen with IQF Freezing technologies are typically smaller pieces of food products and can range from all types of berries, fruits and vegetables diced or sliced, seafood such as shrimps and small fish, meat, poultry and even pasta, cheese and grains. Products that have been subjected to IQF are referred to as Individually Quick Frozen or IQF’d

One of the main advantages of this method of preparing frozen food is that the freezing process takes only a few minutes. The exact time depends on the type of IQF Freezing and the product. The short freezing prevents formation of large ice crystals in the product’s cells, which destroys the membrane structures at the molecular level. This makes the product keep its shape, colour, smell and taste after defrost, at a far greater extent.

Another significant advantage of IQF Freezing technology is its ability to separate units of the products during freezing, which produces higher quality product compared to block freezing. This advantage is also important for food sustainability, as the consumer can defrost and use the exact needed quantity. There is a range of IQF Freezing technologies, but the main concept is to transport the product into the freezer with the help of a processing line belt or infeed shaker. Inside the freezer, the product travels through the freezing zone and comes out on the other side. Product transportation inside the freezer is by different technologies. Some freezers use transportation belts similar to a conveyor belt. Others use bed plates that hold the product, and an asymmetrical movement makes the plate advance by itself through the freezer.

GUANFENG was established in 2013. Through years of hard work, we become one of the leaders in the food machinery industry. We own more than 30 product patent certifications, also obtained ISO9001, CE, SGS etc certifications. If you would like to establish business relationship with us, please contact us at any time. or go to our webstie gf-machine.com or click gf-machine for more information.

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 https://www.gf-machine.com/product/pre-processing-equipment/ for further more information.