With the development of the national economy and the improvement of people’s living standards, my country’s food industry has developed rapidly, people’s living concepts and consumption patterns are undergoing major changes, packaging bags have become more and more important in people’s lives, and new food packaging bags have also been proposed. The requirements of today’s food market competition depend to a large extent on the competition of packaging quality. Science and technology are advancing by leaps and bounds, food packaging bags are changing with each passing day, and the concept of food packaging bags has also shown new characteristics. Food packaging bags should be diversified to meet the consumption needs of modern people at different levels; sanitation, energy saving, environmental protection, sterilization, convenience, and intelligence. Personalization and personalization are the new trends in the development of food packaging bags; green packaging bags that expand the functions of food packaging bags and reduce environmental pollution from packaging waste have become the development trend of food packaging bags.The future packaging bag concept should be to integrate the long-term value of natural ecology into the humanized scientific design concept, and advocate public welfare packaging, green packaging, moderate packaging, and light packaging. Reasonable food packaging bags should have the right protection for food, including physical, chemical, biological performance protection and exquisite decoration without exaggeration, which is convenient for storage, transportation and consumer use.Under the pressure of cost and environmental protection, reduced packaging bags have become a trend in the development of flexible packaging. It advocates reducing the use of packaging materials as much as possible, saving resources and reducing costs on the premise of ensuring effective protection of the contents. To achieve this goal, the adoption of new packaging materials is imperative. In this case, modified polyurethane film products came into being, and will gradually provoke the mainstay of the packaging bag industry.In recent years, some companies in Japan and European and American countries havePVAThe developers of thin films have made breakthrough progress, which also contributes to the improvement of my country’sPVAMany favorable conditions have been created in the research of packaging materials.Based on the prototype of the technology and the complexity of the process, domestic enterprises have also begun to creatively combine various types of substrates (PE/PET/BOPA/BOPP/CPPetc.) are modifiedPVACompared with the polyvinylidene chloride coating cloth using the same substrate, the barrier performance of the former is better than that of the latter.10times or so; again, modifiedPVAThe high-barrier coating has good printing performance, and the coating does not yellow, do not discolor, and has good transparency, and finally. The coated substrate can be dry-laminated with a variety of films to produce different functional packaging materials.In summary, the modificationPVAWith its excellent characteristics, the coating film has created a new world of hygiene, energy saving and environmental protection for food packaging materials. Hygienic Xintiandi is manifested in excellent oxygen barrier properties and excellent corrosion resistance, so it can better ensure the quality of food. modifiedPVAThe coating composite film has excellent shielding ability against small molecular gas, liquid, water vapor, aroma and medicinal smell, and its barrier performance is better thanPVDCCoated film, also better than vinyl —The five-layer co-extruded film of vinyl alcohol copolymer is the best among various conventional resin films. use modificationPVAThe high-barrier coating film can effectively prevent the growth and reproduction of microorganisms and the oxidation of the contents caused by the penetration of oxygen and other gases, and prevent the outflow of fragrance and solvents. Non-polar organic compounds such as aromatics have excellent tolerance. so modifiedPVACoating the composite film can ensure that the packaged goods retain their fragrance and taste during storage and transportation without deterioration, prolong their shelf life and shelf life, and ensure the safety and hygiene of food without contamination.Energy-saving Xintiandi is manifested in that due to its excellent barrier properties, it greatly reduces the amount of raw materials used and simplifies the production process, coating a very thin layer on the substratePVAThe barrier effect of the multi-layer composite film can be achieved, so the amount of raw materials such as resin, coating glue, substrate, etc., as well as the manpower, electric energy, water resources, etc., consumed in the production process have been greatly reduced. , thereby saving resources and reducing energy consumption directly and briefly. The material structure isPET/CPPwater resistance modificationPVACoating composite film and using the same substratePVDCCoating composite film performance comparison.
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