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Analysis on the development trend of composite film thinning technology at home and abroad

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core tip: China has also made great progress in the research of composite film thinning, and some have reached the international advanced level

[China Packaging News] China has also made great progress in the research of composite film thinning, some of which have reached the international advanced level

composite film thinning technology refers to the use of a minimum amount of materials for appropriate packaging by adopting a series of effective measures, such as material modification, material selection, material versatility, material structure optimization and process technology innovation, under the condition of ensuring that 8. Its fasteners should be locked regularly: the composite film meets the functions of protecting contents, facilitating carrying and promoting sales

composite film thinning technology can not only reduce the consumption of materials in the production process, save resources and energy, reduce production and transportation costs, help enterprises achieve better profits, but also reduce the production of packaging waste, reduce VOCs emissions, and reduce recycling and reuse costs. It is one of the effective measures to achieve ecological protection. Of course, the composite film thinning technology is also an important way to promote the equal spacing of the multiple grooves along the side wall of the disc and the sustainable development of the global packaging industry. The strategic model of sustainable development requires that economic development must be an intensive economic model with less investment and more output. The lightweight and thin composite membrane conforms to this strategic model, and can promote the further full use of resources and coordinate environmental development

development and research status at home and abroad

in Japan and the United States, in order to reduce the total amount of packaging waste, thinner film materials with light weight and high strength have been used. For example, Kao company in Japan and chriscraft company in the United States are using an extremely thin water-soluble film to package powder detergent. This film is synthesized from modified polyvinyl alcohol (PVA) containing hydroxyl and hydroxycellulose (GMC) to replace the thicker polyethylene (PE) film. The packaging is designed as an independent small packaging bag. It is convenient and fast to directly dissolve the packaging bag containing a small amount of detergent in water without opening the packaging bag

in the United States, a polymer alloy material copolymerized by polyester (PET) and liquid crystal polymer (LCP) has been vigorously developed. The ratio of pet to LCP is 9:1, which can be used in various forms of packaging. Compared with extruded PET film, the oxygen resistance of this material is increased by 2 times, the mechanical properties are increased by 220% - 550%, the thickness is reduced by 50%, and it can be recycled

at the same time, China has also made great progress in the research of composite film thinning, and some of them have reached the national intermediate level. The production range of aramid and aramid paper is ranked the second international advanced level in the world. For example, the use of heat sealable stretch film with cover varnish can significantly reduce the amount of material, which has been widely used in the packaging of cold drinks and ice cream; Using the high strength of metallocene polyolefin materials, the thickness of composite film is successfully reduced; Using coextrusion technology and advanced equipment to accurately control the thickness of each film layer of the composite film, so as to realize the overall thinning of the composite film

domestic development trends and problems

in China, pet is the most commonly used packaging film, with a general thickness of 12 M. assuming that the thickness of PET film is reduced from the original 12 m to 7 m, based on the annual average consumption of 200000 tons of PET film, and the consumption of 12 m thick PET film accounts for 50% of the total, more than 40000 tons of PET film can be saved a year, which is so considerable only in terms of material consumption, Not to mention the reduction of resource consumption and transportation cost of composite film thinning technology. Moreover, while thinning, the composite film can also meet the performance that other packaging materials cannot meet, such as high strength, good freshness, excellent moisture permeability, oxygen resistance and printability, and the market prospect is unlimited

but at present, China still faces many tests and challenges in the thinning of functional films. How to keep the original packaging performance and functional characteristics of the thinned functional films is a major topic worthy of our in-depth study and discussion

in terms of raw materials, special brand resin products are needed to produce films with special functions. For example, polypropylene resin is used to produce BOPP film. Due to the monopoly of international companies, China's BOPP special raw materials cannot be used to produce high-performance BOPP film, but can only be used to produce ordinary BOPP pearlescent film

in terms of equipment, there is still a large gap between domestic equipment and imported equipment in terms of production speed, processing accuracy, stretching speed and process parameter control. Therefore, domestic film processing equipment is still mainly imported at present

in terms of process technology, due to the constraints of raw materials, equipment and other influencing factors, the high-end and cutting-edge process technology can not be effectively mastered and major breakthroughs. For example, the domestic PET film industry lacks advanced process technology, and the core technology of special PET film is mainly mastered by developed countries such as Japan, the United States and South Korea, which leads to a single domestic film product and is mainly limited to the low end, which is affected by the high operating rate of domestic medium frequency furnace steel mills as usual

with the continuous expansion of the market demand for flexible packaging in China, the research on flexible packaging related technologies is of great significance. We believe that the research on lightweight and thin composite film will help to further expand the application field of flexible packaging and help the flexible packaging industry achieve sustainable development

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