As a food plastic packaging bag, at least the following requirements should be met

In addition to ensuring food safety, plastic food packaging bags are also an important means to ensure the sensory quality of food such as color, aroma and taste. In the modern developed business field, food packaging also plays an important role in the promotion of food. Therefore, as a plastic packaging bag for food, at least the following requirements should be met: 1. Strength requirements: Since food has to go through the process of stacking, transportation, storage and other circulation processes after the packaging is completed, it requires food to reach consumers. The packaging has a certain strength and will not be damaged during circulation. 2. Barrier property requirements: The barrier property requirements of food plastic packaging bags are determined by the characteristics of the food itself, and different foods have different requirements for their packaging barrier properties. On the one hand, the barrier property of food plastic packaging bags ensures that various bacteria, dust, light, gas, moisture, etc. in the external environment cannot enter the food in the package, and on the other hand, it ensures that the moisture, oil, and aromatic ingredients contained in the food are etc., the ingredients essential to the food quality do not penetrate outward, so as to achieve the purpose of ensuring that the packaged food does not deteriorate. There are also some foods that require packaging materials to be selective in gas barrier, such as fruit and vegetable fresh-keeping packaging, by controlling the pore size of the material, O2 and CO2 can be selectively passed through, thereby controlling the respiration intensity of packaged food and achieving fruit and vegetable freshness preservation. the goal of. 3. Safety and hygiene: While food packaging materials have the necessary barrier properties, they must ensure that the packaging materials themselves are safe, non-toxic and non-volatile, that is, the packaging materials themselves are required to have stable tissue components. In addition, during the implementation of the packaging process, substances and chemical components that chemically react with food components will not be produced. In the process of storage and transfer, chemical changes will not occur due to changes in climate and normal environmental factors. 4. Temperature resistance requirements: most of the food processing processes are subject to heat treatment, some are processed at high temperature after packaging, such as canned food and small cooked food, some are hot-filled, such as many hot-filled beverages, and many foods have a long shelf life , If it reaches or exceeds one year, the storage process of this kind of normal temperature food will inevitably pass through the hot summer, and it must be continuously above 300C, which requires the packaging of the food to have a certain temperature resistance. The requirements for temperature resistance vary with food and processing technology. 5. Requirements for avoiding light: Light is very unfavorable for the maintenance of food quality and nutrition. In particular, the irradiation of ultraviolet rays will oxidize the oils and fats in the food, leading to rancidity, oxidizing the natural pigments in the food and changing the color of the food, which will promote the loss of vitamin B and vitamin C in the food. In addition, light will also cause the food to produce amino acids. Decomposition, sugar melting, etc. Physical and chemical changes that are not conducive to the maintenance of food quality. Therefore, for good food packaging, light protection is also very important. 6. Safety requirements: Since food is a daily consumer product, it can only reach consumers through circulation links. This requires food packaging to be suitable for placement, handling, display and convenient purchase, without hurting edges and corners or burrs, as far as possible. Dedicated portable device for easy purchase. Also consider that when opening the package, even if it is not done correctly, it will not cause harm to the consumer. 7. Promotional requirements: Promotional is one of the important functions of food packaging. Promotion requires food packaging materials to be easy to print, easy to shape, easy to color, and light in weight. In this regard, plastic undoubtedly has a unique advantage. 8. Convenience requirements: Convenience packaging is often an important reason for consumers to choose a certain food. The convenience of packaging includes the convenience of use, such as the packaging of condiments, and the convenient shape, such as the newly launched milk tablets (dry milk powder); the convenience of places, such as travel and leisure food for eating out, which require light weight, small size, and easy opening, etc. Features; requirements in terms of convenience in carrying, measurement, operation, and selection.