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.
Technical parameters
| Model | FD-1C | FD-5C | FD-10C | FD-20C | FD-30C | FD-50C |
| Control method | PLC touch screen |
| Working methods | quick freezing, lyophilization |
| Material | SUS304 |
| Drying area (sqm) | 1 | 5 | 10 | 20 | 30 | 50 |
| Loading capacity(kg) | 10 | 50 | 100 | 200 | 300 | 500 |
| Tray size (mm) | 400*500*25 | 600*1000*25 | 800*1000*25 | 600*1000*25 | 800*500*20 | 600*1000*20 |
| Tray pcs | 5 | 9 | 13 | 34 | 76 | 80 |
| Tray form | SUS304, perforated or solid tray |
| Shelf | 8 | 13 | 18 | 38 | 40 | 86 |
| Shelf temperature(°C) | -55~120 |
| Shelf medium | low temperature silicone oil |
| Vacuum pump | Rotary vane pump | two-level pump | combined pump |
| Working vacuum(pa) | ≦130 |
| Ultimate vacuum(pa) | <10 |
| Defrosting method | hot water spray | hot water soaking |
| Compressor | Copeland |
| Power | custom |
| Working environment temperature(°C) | ≦ 40 |
| Rated power(kW) | 6 | 16 | 28 | 56 | 70 | 110 |
| Size (mm) | 2000*700*1700 | 3000*1500*1800 | 3200*1600*2100 | 5000*2200*2500 | 6000*2600*2900 | 9000*3800*3500 |
