Development and application of high barrier multifunctional soft plastic materials
at present, plastic products and composite packaging materials play a decisive role in many food packaging materials. However, traditional plastic materials have certain defects, such as environmental pollution caused by waste packaging, temperature resistance and barrier performance, which are generally inferior to metal and glass containers. Therefore, the rapidly developing food industry has put forward new topics to the plastic industry
nowadays, high barrier and multifunctional soft plastic materials have become the development hotspot. Improving the performance of existing products, developing new varieties, improving the strength, reducing the amount of garbage as far as possible on the premise of meeting the packaging functionality, and making the packaging materials and containers light and thin film is also an important direction. Materials used for food packaging must be highly barrier; Aromatic food requires high oxygen and oil resistance; Dry food requires high moisture resistance; Aromatic food requires high odor resistance; While fresh fruits and vegetables require certain oxygen, carbon dioxide and steam penetration in their packaging. Information came out of the 6th executive director (expanded) meeting of the 5th China Association of industry held on July 28; At the same time, the packaging materials should have good mechanical properties, such as tensile strength, tear resistance, impact resistance, etc. of the main packaging materials. There should also be a good discussion on how Stora Enso can change to meet the new personalized needs of consumers and the development needs of green cycle. Good chemical implicity should not have any chemical reaction with the inner food; In addition, it should have high temperature resistance, which is suitable for high-temperature disinfection and low-temperature storage of food.
pen improve barrier performance using high-strength, high barrier plastics can not only improve the protective function of food, but also reduce the amount of plastic when packaging the same amount of food, and even reuse. For processed foods requiring high barrier protection, vacuum packaging, inflatable packaging, etc., composite materials are generally used for packaging. In multilayer composites, there must be more than one layer of high barrier materials. At present, China Zhongwang continues to launch high value-added aluminum processing products. The commonly used high barrier materials in China are aluminum foil, nylon (PA), polyester, polyvinylidene chloride, etc., while the new type of polyethylene naphthalate (pen) in the world takes the lead and is widely popular. Because the molecular structure of pen is similar to that of pet (polyethylene terephthalate), but the benzene ring is replaced by naphthalene ring, pen has better barrier and heat resistance than pet, especially good gas barrier and UV protection. Due to these advantages, pen has broad prospects in the packaging of beverages, beer and cosmetics. After realizing industrialized production, pen will surely enter the packaging field in a large number in the near future, triggering another packaging revolution after pet. Inorganic barrier packaging materials are favored. At present, the packaging made of aluminum foil and some plastic composites has the defects of opaque, difficult to recycle, and cannot be used for microwave heating. In recent years, the silicon oxide plating (SiO x) developed in recent years has become a substitute. Plating a thin layer of silicon oxide on pet, PA, polypropylene (PP) and other substrates not only has better barrier property, but also has excellent atmospheric environmental adaptability. Because SiOx coating has high barrier, high microwave permeability and transparency, it can be used for soft packaging of high-temperature cooking and microwave processing food, and can also be made into packaging containers for beverages and food oils. At present, the cost of SiOx coating is high, and the production technology of large-scale film is not perfect. A few developed countries have begun to apply it, and China has begun to study it. I don't know how much it costs to study the general tensile machine. Coextrusion film has become a new choice. At present, high barrier and multifunctional soft plastic packaging materials have become a hot spot in the development of plastic packaging industry. In recent years, not only high impermeability, multifunctional fresh-keeping film and sterile packaging film have developed rapidly, but the original composite film is also developing at a deeper level; The successful development of anti-counterfeiting packaging film, especially anti-static packaging film, is also of great significance. At the same time, the breakthrough in bag making and printing technology has made the composite packaging film successfully enter the color era; The development of multi-layer coextrusion technology has also changed the product structure of functional films and containers, and adapted to the requirements of environmental protection.
with the growing call for environmental protection, it is particularly important to minimize the amount of garbage generated on the premise of meeting the functionality of packaging, and to make packaging films and containers develop in the direction of lightweight and film. Because the discharge of adhesives and solvents used in the production of composite high barrier films is easy to cause pollution, the development of CO extrusion packaging films has become a new choice.
foamed plastics move towards zero pollution. The extruded foamed PP sheet of Italian AMUT company is the latest development of foamed plastic products. It uses Montell's high viscosity high resin, high strength PP, PP Homopolymer and special foaming agent to produce foamed PP sheets with fine pores and uniform distribution. Compared with PP sheet with the same performance, it has low density and can save 20% of the material, which is of great economic and environmental significance. The food industry is a sunrise industry in the 21st century. However, with the continuous improvement of people's quality of life and the increasing emphasis on healthy consumption, there will be higher requirements for the quality and safety of food. Accordingly, the plastic industry used for food packaging will also usher in huge development space and development potential
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