Talking about the Application and Characteristics of Precoating Technology in Coated Iron Wen / Yan Xuebin, Hao Changsheng I. Introduction In recent years, with the development of China's economy and technology and the changes in people's consumption concepts and fashion, the coated iron process has gradually replaced the traditional printing iron process with its characteristics of beauty, corrosion resistance, low cost, low energy consumption and environmental protection. There are more and more applications in the field of metal packaging. For example, in the field of iron products such as home appliance panels, fire door panels, aluminum buckle ceilings, etc., the coated iron process has been completely adopted. Most of the iron products such as food cans, beverage cans, aerosol cans, chemical barrels and cans have also been coated with iron. . The coated iron process is a coil coating. The production equipment generally needs to reach 80-100 m, and the investment in fixed equipment is large. At the same time, the adhesive used in the coated iron process is a solvent-based adhesive, and the production line of high-temperature coating is used. There are safety hazards on the surface, and pre-coating technology can solve these problems well. Second, the application of pre-coating technology in the process of coated iron The coated iron process refers to the composite of plastic film such as PET, BOPP, etc. on a cold-rolled steel plate, iron plate or aluminum plate by means of hot-melt bonding instead of tin-plated iron or chrome-plated iron. A method of printing printed iron printing. The coated iron prepared in this way has the dual characteristics of a plastic film and a metal plate. The traditional coated iron process is mainly a wet-coating process of coating film on steel or film, and pre-coated film coated iron is a novel coated iron process which has just emerged in recent years. Compared with the traditional coated iron process, the process eliminates the three most problematic process rings, such as glue adjustment, glue coating and drying. The entire coating process can be completed in a few seconds, avoiding the process. Bubbles, stripping and curling, etc., do not need to be cleaned, and eliminate the root causes of pollution, poison, and fire. It has simple process, convenient operation, high production flexibility, no environmental pollution, high production efficiency, etc. advantage. The pre-coated film began in 1989 and has been widely used in Europe and the United States. It entered Asia around 1996. At the same time as entering Asia, Europe and the United States have announced that it is forbidden to use the film as a pre-coating film. Due to the late use, all of the countries in Asia except Japan have used pre-coated films, and other countries are in a state of pre-coating and film coating. China has only used pre-coated films since 2000, and the market share of pre-coated films in China is still small. In the prior art, the pre-coated film products are mainly applied to packaging films of books, tobacco, alcohol, food, and medicine. In the coated iron industry, such as home shop panels and cans, the products are mainly composed of PET/steel sheets, and they are required to withstand the deep conditions such as deep drawing, salt spray, high temperature resistance and retort resistance. Film coating products are also rare. This is mainly due to the fact that the hot-melt adhesive layer used in the pre-coated film products does not meet the requirements. After many years of technical research, Beijing Gaomeng has developed a hot-melt coating adhesive suitable for coated iron. —YT631. Third, the precoat film is applied to the adhesive in the coated iron Since coated iron products generally need to be stamped into various shapes, and most of the coated iron products are used for household and civil use, the products of coated iron are required to withstand deep drawing, corrosion resistance, salt spray resistance, and high temperature resistance. This requires that the hot melt layer adhesive used in the precoat film meets the following requirements: l, the pre-coated film adhesive layer does not return in the storage and transportation environment 2. The pre-coated film adhesive layer is colorless and transparent, and does not affect the pattern of the printed film. 3. It can melt and wet the surface of the metal sheet quickly during the coating process to produce bonding strength. 4. Adhesives should have sufficient bonding strength with film and metal plate to meet the requirements of deep drawing resistance of coated iron products. 5. Because many coated iron products are in contact with food, the adhesive layer is required to withstand high temperature, salt spray and corrosion resistance! Fourth, the characteristics of pre-coating technology Pre-coating technology refers to pre-coating a layer of adhesive on the surface of a certain adhesive material (such as film, sheet, etc.). In order to facilitate the storage of such pre-coated products, pre-coating is required for storage and transportation. It does not return to the adhesive during the process, and can be quickly combined with another adhesive material to achieve a certain bonding strength during the bonding process. Compared with the traditional instant coating film coating process, the pre-coated film coated iron process has the following characteristics: 1. Low equipment requirements. The precoat film coating process eliminates the application and drying of the adhesive and requires only a set of high temperature composite equipment. Compared with the traditional coating film coated iron process equipment, it is simpler, more convenient to operate, easier to automate production, and improve the film yield. 2. High security. That is, the adhesive for the coating film iron process generally contains a volatile organic solvent, and it is easy to form a flammable and explosive gas atmosphere around the glue tank, and the plastic substrate used during the operation generates friction and generates a static electricity. . The pre-coating film coating process has no glue application, so it is safer and does not endanger the health of the operator. 3. High production efficiency. The pre-coating process greatly simplifies the laminating process, improves the film quality and efficiency, and can be coated at high speed, high efficiency and high quality. The speed of the vehicle can be higher without affecting the appearance and performance of the coated iron product. V. Conclusion In general, the pre-coated film coated iron process as a new type of coated iron process will surely have a place in the coated iron industry, and because of its simple process, convenient operation, large production flexibility, no pollution; With the advantages of high production efficiency, more and more coated iron enterprises will adopt the pre-coated film coated iron process. The application of pre-coating technology in coated iron will be an inevitable trend in the development of coated iron technology! (This article comes from: China Packaging News, No. 43 1 issue, 8th edition comprehensive layout)
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Talking about the Application and Characteristics of Precoating Technology in Coated Iron