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.

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Main Features of Vegetable Drying Machine

The biggest feature of Vegetable Drying Machine is that the color and quality of products after drying does not change. Some experts said that a large number of vegetables are on the market during the harvest season, and many local markets are oversupplied. Fresh vegetables have high water content, strong postpartum respiratory metabolism, and extremely perishable characteristics, which bring considerable difficulties to the storage, transportation and circulation of agricultural products. Therefore, in order to reduce the huge losses of vegetables after the birth, in addition to extensive use of pre-cooling, preservation methods, etc., dried vegetables is also an effective way to regulate supply and demand, digest seasonal surplus, reduce post-natal decay losses, and it is also an effective supplement for fresh vegetables; The drying of vegetables can effectively increase the added value of products as an effective way to increase farmers’ income and promote local economic development.

Rural flue-cured tobacco growing areas in China, tobacco farmers are single-family households to build roasting tobacco houses to dry their own harvested tobacco leaves. For a large number of flue-cured tobacco families, the quality and color of tobacco leaves should not be underestimated. Therefore, the application of tobacco farmers to Vegetable Drying Machine is of great practical significance. The emergence and application of Vegetable Drying Machine have reduced the huge losses of tobacco farmers after production, and the characteristics of non-discoloration and quality have become the biggest advantage of fruit and vegetable dryers.

In a word, because the fruit and Vegetable Drying Machine has national policy support, with low cost, high efficiency, simple operation, and complete functions, the application in rural areas is becoming more and more popular. The application of vegetable dryers has essentially developed the production level of rural agriculture, liberated and improved the productivity of local rural areas, and greatly guaranteed production efficiency. Vegetable Drying Machine is increasingly becoming the new choice for rural vegetable drying.

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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.

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.

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