Food preservation is a great event in life and health. Most of our friends don't know how to do better in the new protection and operation loss. But as more and more fresh food is needed in life, fresh products also appear, such as food film, vacuum bag, etc. before eating some food, we can directly in the refrigerator, think that bacteria will stop breeding and dying at low temperature, But there are many other food refrigerators, so special health, not today, I mainly introduce food vacuum bags.
First of all, the vacuum packaging bag, as the name implies, is to put some fresh food into the bag. After the air inside the bag is packed, an internal vacuum is formed to prevent the outside air from entering the air and air circulation, so as to achieve the fresh effect. Vacuum packaging bags also have its classification, the most common aluminum foil packaging bags, glassware packaging.
II. Advantages of vacuum bag:
1. Easy to use. The vacuum bag can be opened easily and safely. When eating, open the bag to eat, even if it is not heated.
2. Convenient storage and transportation. The material of vacuum packaging bag is light, foldable, occupying less space and saving storage and transportation cost.
3. Save energy. Due to the relatively light weight of the vacuum packaging bag, the packaging is through the sterilization effect, and the energy consumption can be 30-40% lower than that of iron.
4. Long storage time. The vacuum packed food does not need to be refrigerated or frozen, has a stable life, can be comparable with metal, and is convenient for long-term use.
5. Keep the color, fragrance, taste and shape of food. The vacuum bag is thin, which can meet the sterilization requirements in a short time, and keep the original color, fragrance, taste and shape of food as much as possible.
Third, the vacuum packaging bag also has its shortcomings, mainly the lack of high-speed filling equipment, which has a certain impact on mass production. Vacuum packaging bags in food packaging also need to pay attention to a lot of Oh!
In the process of packaging, inflation and sealing are very important. Some foods are perishable. In the process of production, transportation and sales, it is necessary to avoid the product being squeezed by machinery or outside, and this kind of food is easily affected by moisture and oxidation. When the packaging machine, solenoid valve and packaging machine work together, the size of packaging bag, air volume and filling time can be adjusted at the moment before cross sealing. Too much gas may blow up the product and lead to clamping, while too little aeration can not protect the product.