As a new type of drying technology, vacuum freeze-drying technology is to freeze the wet material into a solid state at a lower temperature, and then reduce the environmental pressure of the material to an approximate vacuum, so that the water in it can be directly sublimated into a gaseous state without going through a liquid state, and finally make Drying technology for material dehydration.
The small freeze dryermachinewe produce and sell is a small food-grade small freeze dryer, suitable for household freeze-drying of fruits, vegetables, etc. It is not recommended to freeze-dry medicines. The machine is made of 304 stainless steel and has a rubber sealing ring.
The Working Principle of the Small Freeze Dryer:
The basic principle of the domestic small freeze dryermachineis based on the three states of water. Water has solid, liquid and gaseous states, and the three states can be transformed into each other and can coexist. Freeze the dried items to below 0°C, and use the principle of sublimation in a vacuum state to make the moisture in the pre-frozen materials directly sublimate into water vapor in an ice state and be removed without melting the ice, so as to achieve freezing drying purpose.
Small Freeze Dryer Model:
ZZKD Machineryhas been focusing on the research and development and production of small freeze dryersmachinefor many years. small freeze dryers are one of our main products. After several upgrades, there are more and more models and types of small freeze dryers. There have also been great changes.
We currently have seven models for small freeze dryersmachine for sale: FD-01, FD-03, FD-04, FD-06, FD-10, FD-50, FD-100.
Small Freeze Dryer Structure:
Small freeze dryer, also known as vegetable small freeze dryeror fruit small freeze dryer, is composed of drying box, refrigeration system vacuum system, media heat exchange circulation system, automatic control system, pneumatic system and in-place cleaning and disinfection system.
Drying box: The drying box is a vacuum-tight low-pressure container made of stainless steel, which can withstand positive and negative pressures and meets the requirements of steam sterilization. The seal is made of high-temperature-resistant and low-temperature-resistant silicone rubber, and the insulation layer is made of heat-insulating materials.
Box: Rectangular box with a drainage port at the bottom and an observation window on the side. The box is also equipped with a pressure gauge, a temperature measuring resistor, an air release valve, an air seepage valve, a safety valve, and a spray inlet connector.
Shelves: special hollow splints are used, with high strength and good sealing. The shelf assembly is installed in the freeze-drying box through a bracket, and a board layer should be installed on the top layer as a heat radiation compensation board to ensure that the food space in the box is in the same temperature environment. In addition, both sides and the back of the shelf are equipped with Stop rails to keep food pans or food off the shelves.
Box door: cylinder automatic locking device is adopted. Ensure the required vacuum degree during the decompression process inside the box. An oil mist collector is installed at the exhaust port of the vacuum pump 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.
Media heat exchange circulation system: transfer heat to the shelf and then to the food by driving the circulation pump. The cooling and heating switching of the small freeze dryeris accomplished by controlling the electromagnetic valve switch of the cold source and the heat source. The system includes heat medium heating tank plate heat exchanger, pneumatic control valve, cooling water solenoid valve, circulation pump, pipeline, solenoid valve, temperature sensor, etc.
Automatic control system: with freeze-drying curve setting, vacuum pump test and control, medium temperature, food temperature water trap temperature control, drying state detection, road removal, cleaning and sterilization in place, automatic protection and alarm and other functions.
Pneumatic system: Control pneumatic valves
CIP system: for cleaning and steam sanitizing of drybox water traps
How to Use the Small Freeze Dryer:
1. Before freeze-drying fruits and vegetables, pack the fruits and vegetables that need to be freeze-dried into suitable containers, usually glass mold bottles and glass tube bottles. The filling volume should be uniform, and the fruits and vegetables should be cut as large and thin as possible ;
2. Put it into a metal tray suitable for the size of the freeze-drying box.
3. Before packing, first cool down the freeze-drying box in an empty box, and then put the product into the freeze-drying box for pre-freezing; or put the product into the freeze-drying box for pre-freezing at the same time;
4. Before vacuuming, the cold trap should be operated in advance according to the cooling speed of the cold trap refrigerator, and the temperature of the cold trap should be at least -40°C during vacuuming;
5. After the vacuum reaches a certain value, the products in the box can be heated. Generally, heating is carried out in two steps. The first step is to heat the product so that the temperature of the product does not exceed the eutectic point or the temperature of the eutectic point; the second step is to heat the product after the moisture in the product is basically dry. The specified maximum permissible temperature rise. After keeping the maximum allowable temperature for more than 2 hours, the freeze-drying can be ended.
6. After the freeze-drying is completed, dry and sterile air should be filled into the drying box, and then stoppered and sealed as soon as possible to prevent the moisture in the air from being reabsorbed.
Features of Small Freeze Dryer:
1. With fast drying speed, the time is shortened by 3~10 times;
2. Low energy consumption, only 20%-30% of the energy consumption of ordinary dryers;
3. The drying temperature range is wide, and it can be dried quickly in the low temperature range;
4. The vacuum in the drying chamber is oxygen-free, and the drying quality can be comparable to that of the original ecological fresh materials;
5. It can recover organic solvents, which is conducive to reducing production costs and environmental protection, especially suitable for materials containing organic solvents that cannot be dried by ordinary dryers.
6. The vertical door-opening structure can realize in-situ freeze-drying of materials;
7. The control system takes PLC as the core, adopts the touch screen as the man-machine operation interface, records the multi-channel temperature data in the process of freeze-drying in real time, and can browse in the form of curve, the man-machine interface is clear and intuitive.
8. The shelf temperature control curve can be preset to realize the automation of the sublimation process.
9. It can reduce the possibility of the material being oxidized and deteriorated, eliminate the bacteria in the material, and ensure the quality; at the same time, the original shape of the material can be well preserved
10. The small freeze dryeris a process of drying materials under low temperature and vacuum conditions, and maintains the color, aroma, taste, shape and nutritional components of the dried materials to the greatest extent, and the products are easily soluble in water and can be quickly restored. Long shelf life after sealed packaging.
Application of Small Freeze Dryer:
1. Fruit and vegetable processing
Freeze-dried food is 5 to 10 times the price of ordinary dry food, and there is a huge market demand. The development of freeze-dried food can improve the grade of my country's export food and obtain higher added value and economic benefits. The structure and composition of fruits and vegetables determine the difficulty of freeze-drying. Generally, the smaller the material size and the more uniform the structure, the easier it is to handle. Because such a material has a large surface area, it is evenly heated and cooled, and the freeze-drying time is short and easy to control. The flavor, shape and color of the original fruit can be kept to the greatest extent, and the freeze-drying time is short and the production cost is low.
2. Aquatic product processing
Aquatic product processing is an important way to improve the comprehensive benefits and added value of aquatic products. Deep processing can improve the grade of high-quality aquatic products and increase the nutrient source, comprehensive utilization rate and added value of low-quality aquatic products.
3. Edible mushroom processing
Edible fungus is a pollution-free natural green food with high edible value and health value, and is known as the health food of the 21st century. Freeze-drying can better maintain the nutrition of edible fungi and has good rehydration.
Precautions for Freeze Drying Operation of Small Freeze Dryer:
1. Do not use the small freeze dryerif it is not installed correctly.
2. Do not use the small freeze dryerwithout permission.
3. Do not use the small freeze dryerif the shelf is not in place.
4. Corrosive substances cannot be freeze-dried without special safety measures. Even with protection, it is necessary to ensure that the material of the host machine will not be corroded and the mechanical strength of the cold trap, door panels and other accessories will not be reduced.
5. Producers are not allowed to add attachments without permission. Do not use if the container is of poor quality, as it is very dangerous for the container to burst during lyophilization.
6. Do not use the small freeze dryerin areas with explosion hazards.
7. Do not bump or move the small freeze dryerduring use, and do not lean or rest on it.
8. Do not place potentially dangerous objects, such as bottles containing liquid, near the small freeze dryer.
9. Samples that will react during lyophilization cannot be dried.
10. Do not freeze-dry explosive or flammable samples.
11. Infectious, poisonous, pathogenic and radioactive substances must be placed in suitable containers before they can be freeze-dried.
Why Choose Us
Professional drying equipment manufacturer
ZZKD Machinery Equipment Co., Ltd. is a company integrating production and trade. Our main product is drying equipment. small freeze dryeris one of our main products. Our small freeze dryermodels are: FD-01, FD- 03, FD-04, FD-06, FD-10, FD-50, FD-100. At the same time, we can also customize according to your needs. The company has been established for more than ten years, providing equipment solutions for tens of thousands of enterprises and individuals at home and abroad, and has won unanimous praise from domestic and foreign customers.
We have warehouses in Los Angeles in the United States, Valencia in Spain, and Thailand. We can choose the nearest warehouse for delivery according to the customer's geographical location, ensuring that the customer receives the goods quickly.
Perfect after-sales team
We provide a one-year warranty service for the products we sell. We have a professional after-sales team to deal with customers' after-sales problems, and can provide corresponding technical guidance through videos and other methods.