Precautions for the operation of vacuum freeze dryer

　　Key Operating Points

　　Normally, the pre-treatment of food, fruits and vegetables by vacuum freeze dryer refers to all the processing before sublimation drying, so freezing before drying is also considered as pre-treatment. The pre-treatment of raw materials is actually the same as that of conventional dried and frozen fruits and vegetables. All of them require selection, cleaning, peeling, cutting, blanching, cooling and other processing steps.

　   Key operating points of vacuum freeze dryer:

　　1. Pre freezing

　　This operation is actually freezing the pre treated raw materials, which is an important process in freeze-drying work. Due to the complex physical, chemical, and biochemical changes that occur during the freezing process of fruits and vegetables in a fruit and vegetable freeze-drying machine, the pre freezing quality of the machine directly affects the quality of the freeze-dried fruits and vegetables. The key factor to consider during the freezing process is the impact of freezing rate on the quality of frozen materials and drying time. There are the following differences between quick freezing and slow freezing: the ice crystals produced by quick freezing are relatively small, while those produced by slow freezing are relatively large; Large ice crystals are more conducive to sublimation, while small ice crystals are not conducive to sublimation; Small ice crystals have a relatively small impact on cells, and the smaller the ice crystals, the better they can reflect the original structure and properties of the dried product. However, fruit and vegetable freeze dryers have a higher freezing rate and energy consumption. So, we should consider comprehensively and choose a good freezing rate, which can not only ensure the quality of freeze-dried food, but also reduce the energy consumption of freezing.

　　2. Sublimation

　　Sublimation drying is the core process of food freeze-drying production, and the process conditions must be well controlled:

　　During the drying process of fruit and vegetable freeze dryers, the machine has a high wet weight load, which means that the drying quality per unit area of the drying plate will determine the drying time. The factor that affects the drying time is actually the thickness of the dried food, which is also a very important factor that cannot be ignored.

　　During the freeze-drying process of fruit and vegetable freeze dryers, the drying of materials is pushed from the outer layer to the inner layer. Therefore, when the drying material is relatively thick, the required drying time is relatively long. In the actual drying process, the dried material will be cut into a uniform thickness of 15 to 30mm. The amount of material loaded on the drying board per unit area should be determined based on the heating method and various types of dried food. When using industrial large-scale equipment for drying, if the drying cycle is 6-8 hours, the loading capacity of the drying board should be within the range of 5-15kg/m.

　　Key points to note during operation of vacuum freeze dryer

　　Our company is a professional provider of vacuum freeze dryers and solutions. We are an experimental freeze dryer enterprise that integrates research, production, and sales. We have a complete range of freeze dryer equipment, including vegetable jelly dryers. Below is an introduction to the knowledge of vegetable jelly dryers.

　　The vacuum freeze dryer is mainly based on vacuum technology, freezing technology, drying technology, and aseptic technology. Through various combinations of freeze dryers and their supporting equipment, it simplifies the complex operation of small freeze dryers, prevents fruit and vegetable contamination, and accelerates the moisture sublimation of materials.

　　The vegetable and fruit machine has programmable heating and temperature control functions, and can view the freeze-drying curve, making it convenient for users to observe the freeze-drying process of fruits and vegetables. Compared with pilot freeze-drying machines with the same freeze-drying area, this product has the advantages of small size and low price; Compared with traditional laboratory small freeze-drying machines, it is easy to operate, on-site freeze-drying, and avoids pollution and manual tedious operations during the material drying process.

　　Precautions during production

　　1. Ensure that the freeze dryer operates in a stable environment. Avoid dangerous or imbalanced environments.

　　2. Strictly follow the steps to operate the freeze dryer.

　　3. Avoid contact with corrosive substances, as this may damage the mechanical performance of the freeze-drying mechanism and cause machine failure.

　　4. Be careful to prevent frostbite of limbs. Corresponding protective measures should be taken during operation to ensure safe production.

　　Precautions during maintenance

　　1. Before maintenance or repair, the power should be cut off first to ensure safety.

　　2. Timely clean up toxic and harmful substances adhered to ensure hygiene and safety.

　　3. Use qualified accessories for replacement operations. If inferior accessories are used, it will increase safety hazards during use.

　　4. Please have professionals perform the operation to avoid technical issues that may damage the freeze-drying machine.

　　We have briefly introduced the precautions to be taken when working with a vacuum freeze dryer. Currently, vegetable jelly dryers are increasingly used in food, such as freeze-dried instant noodles, freeze-dried fruits and vegetables. It can preserve the original nutrition of food, restore its original taste, and supplement your nutrition. When fresh fruits and vegetables turn into freeze-dried food, besides taste, what we eat is nutritious and healthy. We accompany you to study, work overtime, play, and travel with our low-temperature freeze-dried lemon slices, injecting you with abundant energy. The frozen lemon has a fresh appearance and bright color, retaining the original sour and sweet taste of lemon while also leaving a faint lemon aroma. The four ring freeze-drying machine for dried fruits and vegetables is also popular among friends. Please feel free to inquire.

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