The working principle of a food freeze-drying machine is to freeze food at low temperatures, and then use the sublimation phenomenon in a vacuum environment to directly convert solid ice in the food into water vapor and remove it, thereby achieving the purpose of drying. During this process, the temperature of the food is kept below freezing point, effectively preventing the oxidation and degradation of nutrients.

Food dryer is a very useful food processing equipment that can be widely used in the food industry, pharmaceutical industry, chemical industry, and other fields. Through reasonable use and operation, its advantages can be fully utilized to improve the quality and taste of food, and meet people's requirements for food quality and taste. In the field of modern food processing and preservation, food freeze-drying machines have become an indispensable and efficient tool. It combines two major technologies of freezing and drying, providing a new way of preserving food. It not only effectively extends the shelf life of food, but also maintains its original color, aroma, taste, and nutritional components.

When using a food dryer, it is important to pay attention to some operating points. Firstly, it is necessary to select appropriate temperature and time, and set the drying time and temperature according to the type and degree of processing of the food. Secondly, it is important to keep the dryer clean, as a large amount of dust is generated during use. If not cleaned in a timely manner, this dust may affect the quality and taste of the food. Finally, pay attention to the freshness of the food and choose fresh food for drying, which can ensure a better taste of the dried food.

However, food dryers also have some drawbacks. For example, some foods may become harder or chewy after drying, affecting the taste experience. Under high temperature and prolonged drying, some nutrients can be destroyed, reducing their nutritional value. In addition, the purchase cost of food dryers is relatively high, and the usage cost, including electricity bills, needs to be considered.