Fruit chips belong to a kind of dehydrated fruit and vegetable food, which is called vacuum low temperature dehydrated fruit chips, or VF for short. The product fully retains the fruit nutrients and color flavor, has the characteristics of pure natural, low fat, low calorie, crisp taste, fresh and natural, is a popular leisure food in the world.
Because the product is processed in a vacuum tank, and the dehydration of fruits and vegetables is carried out at a relatively low temperature, the nutritional components and natural color and flavor of the food are not damaged by high temperature. Therefore, it is quite different from normal temperature fried food in meaning. Its basic principle is to use the three different physical phenomena of oil and water under the condition of decompression
（1） The boiling points of oil and water decrease (about 80 ℃ for oil and 40 ℃ for water);
（2） When the boiling point is reached, water changes from liquid state to gas state, but oil is different;
（3） Due to the different specific gravity of oil and water, the water in the material can be replaced at high boiling point, which can quickly dehydrate fruits, vegetables and other materials in a short time.