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Introducing Vacuum Freeze Dryer
- Nov 28, 2017 -

China is a big agricultural country rich in vegetables, meat and aquatic resources, processing such food resources into freeze-dried foods and using domestic freeze-dried processing equipment at a price of only a quarter of the imported equipment. Seizing the opportunity of developing the western region and developing exports of bulk foods such as freeze-dried vegetables and freeze-dried beef jerk, it is a promising foreign exchange earning project with great profits and low risks. For a long time, China's agricultural and animal husbandry products have been hovering in the export of raw materials or primary processing stage, giving the overall feeling of a low technical content. Through the development of freeze-dried vegetables and meat, etc., will raise the grade of food exports in our country, access to higher value-added (per kilogram of lyophilized vegetables by varieties of 100 yuan to 300 yuan). There are some famous local specialty products in all parts of China. After being processed by freeze-drying process, the product becomes a famous specialty of high-end dehydration. In the international market, the demand for freeze-dried food falls short of demand. The domestic freeze-dried food industry is still in the early stage of development with low output. But attracted a large number of foreign businessmen to buy our country market. This not only has an external cause of shortage of freeze-dried food in the international market, but also low internal cost of freeze-dried food in China. China should make full use of the opportunity of the large-scale development of the western region, vigorously develop freeze-dried foods, deepen the value-added processing of the abundant agricultural and sideline products in the western region and export foreign exchange earning foreign exchange. At present, China's freeze-dried foods, including: soup, shrimp, semi-finished products such as egg powder, health products (such as freeze-dried ginseng) and instant noodles seasonings (such as instant noodles dehydrated vegetables, meat Ding) Less than 3000 tons. According to the prediction of experts, in 2010, only one high-end instant noodle auxiliary material in our country will require about 40,000 tons of freeze-dried food, together with various fast food ingredients, soups and drinks, and the annual consumption of lyophilized food will exceed 100,000 tons. The huge demand of freeze-dried food both at home and abroad provides great opportunities for the development of the freeze-dried food industry in China.

 In Europe, the United States, Japan, you can see an array of freeze-dried food. These are made by vacuum freeze-drying techniques. Vacuum freeze-drying technology is a high-tech dehydration technology for color protection, preservation and shelf life of food and medicine. The dried fruits and vegetables, fruits, meat, aquatic products and seasonings after dehydration are now entering restaurants and families except those used in aerospace, military, climbing, tourism, exploration and mining industries. From the overall trend of development, equipment, energy consumption is getting lower and lower, shorter and shorter production cycle. Freeze-dried food in the international market price is 4-6 times the hot-air dried dehydrated food, is becoming a hot commodity in international trade.

       Freeze-dried food is fresh food frozen quickly, into the vacuum vessel dehydration, under vacuum, the water from the solid ice into gas, so that the material dehydration and drying. Made with freeze-dried process of food, not only color, smell, taste, shape and taste, but also save the food in vitamins, protein and other nutrients. Before consumption, a little processing, will be restored within a few minutes as fresh food.

       Freeze-dried foods do not refrigerate equipment, sealed packaging, long-term storage at room temperature, transportation and sales, 35 years without deterioration. As 5% moisture content of freeze-dried food, good quality and light weight, can greatly reduce its operating costs. For example, tomato sauce after freeze-drying process, 1000 grams of fresh tomato sauce can be processed into 320 grams of dried tomato sauce, a water that is restored to tomato sauce. Popular by people. Nowadays, lyophilized tomato sauce has become a replacement for tomato sauce.

      In the production of vacuum freeze-dried food, there are generally selected materials, cleaning, cutting, blanching, sterilization and other processes. It should remove the insects and eggs and sediment attached to the roots and leaves, remove the metal debris with a magnetic field, static electricity to remove hair, scales and other foreign matter, to avoid overheating, regardless of cooking or dipping, according to process requirements, only the Good pre-off, it is possible to produce high-quality freeze-dried food. Frozen frozen pre-treatment items, the faster the freezing, the smaller the crystallization of the items, the destruction of the structure of the organization is small. Frozen time is short, the protein in the role of aggregation and concentration, will not occur qualitative change.

      Frozen food to be quickly vacuum sublimation drying, vacuum requirements to quickly sublimate pressure, and timely supply of sublimation heat to maintain the same sublimation temperature, the general use of radiation heating.

       Lyophilized food was porous, the tissue surface to expand than the original 100 to 150 times, so the opportunity to increase contact with oxygen, from low to low pressure to restore atmospheric pressure, the nitrogen environment should be carried out. Crush, packaging should be at a relative humidity of 30 ~ 40%, the temperature below 25 ℃. In order to keep dry food moisture below 5%, the package should be placed desiccant and adsorption of trace moisture. Packaging materials should be chosen poor air permeability, high strength, color depth is good.

       Freeze-dried technology can process a variety of vegetables, fruits, fish, instant noodles, condiments and coffee, tea, Chinese medicine and so on.

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