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Types of materials in food packaging bags you didn’t know about

The application types of food packaging materials are mainly divided according to functional requirements. In order to ensure food safety, packaging materials must require stable chemical properties, non-toxic, tasteless and other characteristics. Shelf life issues. For example, vacuum food packaging bags require high air tightness, high barrier properties, and high shading properties. Oily foods are required to have high itching resistance and oil resistance. Products such as nuts and dried fruits must have high moisture resistance, aromatic foods require high aroma retention, and fresh fruit and vegetable products require high transparency and high air permeability. Rice packaging needs to have high tensile strength, tear resistance, and impact resistance. Product packaging for high temperature cooking must have ultra-high thermal stability. On this basis, we have also developed some new functional materials: composite packaging bags, aluminum foil bags, plastic packaging bags 1. New high-barrier packaging materials Commonly used high-barrier packaging materials include aluminum foil (AL), nylon (PA), poly Ester (PET), polyvinylidene chloride (PVDC), etc. With the improvement of food protection requirements, high-barrier plastic packaging materials have been widely used abroad. The use of high-barrier plastics can not only improve the protection of food, but also reduce the amount of plastic used when packaging the same amount of food. For processed foods that require high barrier protection, as well as vacuum packaging, inflatable packaging, etc., high-quality composite packaging materials are generally used, and there must be more than one layer of high-barrier materials in multi-layer composite bags materials. For example, nano-modified new high-barrier packaging materials nano-composite polyamide, ethylene-vinyl alcohol copolymer, polyvinyl alcohol, etc. 2. Active packaging materials The application of active packaging materials and active packaging technology has become a development trend of food safety packaging. The so-called active packaging technology is to use active packaging materials to interact with the excess gas inside the packaging to prevent the oxygen in the packaging from accelerating the oxidation of the food. In the 1970s, the deoxidizing active packaging system came into being, and soon deoxidizers began to be used in food packaging. Active packaging has been proven to be effective at maintaining food nutrition and flavor. Due to the advancement of material science, biological science and packaging technology, active packaging technology has developed rapidly in recent years. Among them, iron-based deoxidizers are one of the fastest-growing types. Nitrite-based, enzyme-catalyzed, organic deoxidizers, Photosensitive deoxidizers, etc., make the safety of packaged food increasingly perfect. 3. Intelligent packaging materials Intelligent packaging materials. Intelligent packaging materials used for food safety packaging mainly include display materials, sterilization materials, and bacteria detection materials. Recently, Canada has launched a unique packaging material for detectable bacteria, which can detect four pathogens: Salmonella, Campylobacter, Escherichia coli, and Listeria. In addition, the packaging material can also be used to detect the protein content of pests or genetically engineered food, and indicate whether it is a genetically engineered food. A Japanese food company recently launched an antibacterial plastic packaging container, which is made of fiber plastic and polypropylene, and then mixed with an antibacterial agent for food films, which can prevent the reproduction of microorganisms and bacteria. Fourth, anti-ultraviolet damage food packaging materials American Ciba Refinery has successfully developed a UV blocker, which can protect the food in the package from the damage of ultraviolet rays, improve the safety of the packaged food, and prolong the shelf life. 5. Sterilized active packaging materials Recently, a sterilized active packaging system, including a sterilization system, has been successfully researched abroad. It is a system that combines active sterilization substances and packaging materials, such as sorbitol, sorbate, sodium benzoate, silver zeolite and other substances are added to the materials for manufacturing packaging containers, and then processed into containers by molding, making them Slow release of sterilized active ingredient. The newly invented sterilization type deoxidizing preservative can remove more than 99.9% of the oxygen in the sealed container within 24 hours, and produce deoxidizing effect within a short time. 6. Aseptic and high-barrier food packaging materials Because the packaging made of aluminum foil and certain materials is not transparent, not easy to recycle, and must not be used for microwave heating, in recent years, researchers have successfully developed aseptic SiOx-plated packaging materials , that is, in a vacuum environment, a very thin layer of silicon oxide is plated on plastic film substrates such as PET, PA, PP, etc., and then it is made with sterilization function. It not only has good barrier properties, but also has better adaptability to the atmospheric environment, and its barrier properties are never affected by changes in ambient temperature. The cost of SiOx coating is relatively high, and the large-scale production technology is not perfect. At present, China has begun a certain scale of research, and developed countries have already applied it in food packaging.

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