1. Gas barrier and preservation
Transparent Cellophane Square Bottom Bag has a certain preservation function, which is first related to its gas barrier. Cellophane is a semi-permeable material that has a certain barrier ability to gases such as oxygen and carbon dioxide. For some foods that are sensitive to oxygen, such as fried foods such as potato chips, the entry of oxygen will accelerate the oxidation and rancidity of oils and reduce the quality of food. Cellophane square bottom bags can slow down the penetration rate of oxygen, thereby extending the shelf life of products. Although its gas barrier property is not as good as some special high-barrier plastic packaging, it can still play a certain preservation role in a short period of time or for products that do not have extremely high preservation requirements.
2. Water vapor barrier properties
Water vapor control is also very important for preservation. Transparent Cellophane Square Bottom Bag can have a certain barrier effect on water vapor. For example, when packaging some dry foods, such as biscuits, if a large amount of water vapor enters, the biscuits will become damp and soft, affecting the taste and quality. Cellophane square bottom bags can prevent the intrusion of external water vapor and maintain a relatively dry environment in the bag. At the same time, for some products that contain a certain amount of water, such as fresh fruits, it can also reduce the excessive loss of internal water and maintain the freshness of the fruit.
3. Light blocking and preservation
Light is also one of the factors that affect the preservation of products, especially ultraviolet rays, which will accelerate the chemical reactions of certain substances. Transparent Cellophane Square Bottom Bag has a certain blocking effect on light. Although it is not a special light-proof packaging, it can partially block the light, especially the penetration of ultraviolet rays. This can reduce the occurrence of photochemical reactions for some products that are easily affected by light, such as medicines and certain skin care products, and help the preservation and quality stability of the products.
4. Synergy with other preservation measures
However, the preservation function of Transparent Cellophane Square Bottom Bag is limited. In practical applications, it is often necessary to cooperate with other preservation measures. For example, for fresh food, in addition to using cellophane square bottom bags for packaging, it may also be necessary to cooperate with refrigeration, adding preservatives and other measures. Moreover, the preservation effect of cellophane square bottom bags is also affected by factors such as the sealing degree of the bag and the temperature and humidity of the storage environment. If the seal is not tight, outside air can easily enter the bag, which will greatly reduce its preservation function; in a high temperature and high humidity environment, its preservation effect will also be greatly reduced. Therefore, the Transparent Cellophane Square Bottom Bag has a certain preservation function, but this function is relative and conditional, and it is necessary to consider various factors comprehensively to achieve a better preservation effect.
