SS304 Durian Jackfruit Drying Machine

Durian Jackfruit Drying Machine Vacuum Freeze Dryer Lyophilizer

Vacuum Freeze Dryer

Freeze-drying is a technique that uses the principle of sublimation to dry. It is a process in which the dried material is quickly frozen at a low temperature, and then in a suitable vacuum environment, the frozen water molecules are directly sublimated into water vapor to escape. The product obtained by freeze-drying is called lyophilizer, and the process is called lyophilization. The substance is always at a low temperature (frozen state) before drying, and ice crystals are evenly distributed in the substance. The sublimation process will not be concentrated due to dehydration, avoiding side effects such as foaming and oxidation caused by water vapor. The dry substance is porous in the form of a dry sponge, its volume is basically unchanged, and it is easily soluble in water to restore its original shape. To the greatest extent, prevent the physical, chemical and biological denaturation of dry substances.　

The freeze dryer is composed of a refrigeration system, a vacuum system, a heating system, and an electrical instrument control system. The main components are drying oven, condenser, refrigeration unit, vacuum pump, heating/cooling device, etc. Its working principle is to freeze the dried item to below the triple point temperature first, and then directly sublime the solid water (ice) in the item into water vapor under vacuum conditions, remove it from the item, and dry the item. After pre-processing, the materials are sent to the quick-freezing warehouse for freezing, then sent to the drying warehouse for sublimation and dehydration, and then packaged in the post-processing workshop. The vacuum system establishes low-pressure conditions for the sublimation drying chamber, the heating system provides sublimation latent heat to the material, and the refrigeration system provides the required cold energy to the cold trap and the drying chamber. This equipment adopts high-efficiency radiant heating, and the material is heated evenly; it adopts high-efficiency water traps and can realize rapid defrost; adopts high-efficiency vacuum unit, and can realize oil-water separation; adopts parallel centralized refrigeration system, multi-channel cooling on demand, working conditions It is stable and energy-saving; it adopts artificial intelligence control, which has high control precision and convenient operation.

Xinyu Instrument Network's quality requirements for freeze-dried products are: unchanged biological activity, uniform appearance and color, full shape, firm structure, fast dissolution rate, and low residual moisture. To obtain high-quality products, you should have a more comprehensive understanding of the theory and technology of freeze-drying. The freeze-drying process includes three stages: pre-freezing, sublimation and re-freezing. Reasonably and effectively shorten the freeze-drying cycle has obvious economic value in industrial production. Structure The vacuum freeze dryer consists of a drying box, a refrigeration system vacuum system, a media heat exchange cycle system, an automatic control system, a pneumatic system, and an in-place cleaning and disinfection system. Drying oven The drying box is a vacuum-sealed low-pressure container. The materials are all stainless steel, which can withstand positive and negative pressures and meet the requirements of steam sterilization. The sealing is made of high temperature and low temperature resistant silicon rubber. The insulation layer is made of closed bubble elastic heat insulation materials.

1) Box body: a rectangular box body with high space utilization rate is adopted. The bottom is equipped with a drainage port, and an observation window is opened on the side. Spray inlet connector.

2) Shelves: The energy needed to cool and open the food is transmitted to the shelf through the heat exchange medium, and then to the food. The shelf adopts a special hollow plywood, which has high strength and good airtightness. The shelf components are installed in the freeze-drying box through the bracket. A board layer should be set up as a heat radiation compensation board to ensure that the food space in the box is under the same temperature environment. In addition, both sides and back of the shelf are installed Block the rails to prevent food pans or food from falling off the shelf.

3) Box door: the cylinder automatic locking device is adopted. Ensure the vacuum required during the decompression process inside the box. When the vacuum pump is working, the butterfly room is opened. The air and water vapor in the vacuum drying chamber pass through the water trap to capture moisture and enter the vacuum pump. The exhaust port of the vacuum pump discharges the system. The exhaust port of the vacuum pump is equipped with an oil mist trap. To prevent the smoke in the exhaust gas from polluting the indoor environment. In order to prevent water vapor from entering the pump, the system is equipped with a gas ballast valve, which is opened during the drying process.

Compared with the conventional method, the freeze-drying method has the following advantages:

* Many heat-sensitive substances will not be denatured or inactivated. * When drying at low temperature, the loss of some volatile components in the substance is small.

* During the freeze-drying process, the growth of microorganisms and the action of enzymes cannot proceed, so the original properties can be maintained.

* Since the drying is carried out in a frozen state, the volume is almost unchanged, the original structure is maintained, and concentration does not occur.

* Since the moisture in the material exists in the form of ice crystals after pre-freezing, the dissolved inorganic salt substances originally dissolved in the water are evenly distributed in the material. During sublimation, the dissolved substances dissolved in the water are precipitated, which avoids the phenomenon of surface hardening caused by the precipitation of inorganic salts on the surface due to the migration of the internal moisture of the material to the surface in the general drying method.

* The dried material is loose, porous, and sponge-like. After adding water, it dissolves quickly and completely, and restores its original properties almost immediately.

* Since the drying is carried out under vacuum, there is very little oxygen, so some easily oxidizable substances are protected.

* Drying can remove more than 95% to 99% of moisture, so that the dried product can be stored for a long time without deterioration.

* Because the material is in a freezing state and the temperature is very low, the temperature of the heat source for heating is not high, and the normal temperature or low temperature heater can meet the requirements. If the freezer compartment and the drying compartment are separated, the drying compartment does not need to be insulated, and there will not be a lot of heat loss, so the use of heat energy is very economical. 

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