Yingtai Freeze Dryer: The "Nutrition Preservation Expert" in Food Processing

Yingtai Freeze Dryer: The "Nutrition Preservation Expert" in Food Processing

In the food processing industry, the freeze dryer has become a key equipment for retaining food nutrition and flavor by virtue of its core "low-temperature freeze-drying" technology. It first freezes food below the freezing point (usually -30℃ to -50℃), then makes ice crystals sublimate directly into water vapor in a high-vacuum environment, and finally obtains freeze-dried food with a moisture content of less than 5%. It is widely used in the production of fruit and vegetable crisps, instant coffee, probiotic powder and other products. It can not only lock in vitamins and active ingredients, but also maintain the original shape and taste of food.

For different foods, the operation of the freeze dryer requires precise adjustment of parameters. When processing fruits and vegetables, the pre-freezing time should be controlled at 2-4 hours to ensure that the water in the cells is completely frozen and avoid soft taste after thawing; the shelf temperature in the sublimation stage should be slowly raised to 30℃-40℃ to prevent the surface of fruits and vegetables from hardening due to too fast temperature rise; in the desorption stage, the temperature should be raised to 45℃-55℃ to completely remove bound water and extend the shelf life. For heat-sensitive foods such as probiotic powder, the temperature of the entire freeze-drying process must be strictly controlled between -40℃ and 35℃, and the vacuum degree should be maintained below 5Pa to retain the activity of probiotics to the greatest extent.

Daily maintenance should focus on the "vacuum system" and "refrigeration system" of the equipment. After each use, clean the freeze-drying chamber with sterile water and then dry it with hot air to prevent food residues from breeding bacteria; check the frosting of the cold trap every week, and defrost in time if the frost layer is too thick to avoid affecting the refrigeration efficiency; replace the vacuum pump oil every month to ensure stable vacuum degree; leak detection of the refrigeration unit every six months to prevent equipment failure caused by refrigerant leakage. In addition, the temperature sensor and vacuum gauge should be calibrated regularly to ensure accurate parameters and avoid affecting food quality due to data deviation.

Compared with traditional drying technology, the food processed by the freeze dryer has the advantages of high nutrition retention rate, good rehydration, and long-term storage without additives. With the increasing demand for healthy food from consumers, freeze dryers with the characteristics of mass production, intelligent temperature control, energy saving and consumption reduction have become core equipment for food enterprises to upgrade production processes and create high-end products.