Production technology and innovative application o

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Production technology and innovative application of aluminum cans (Part 2)

IV. technological innovation of aluminum cans

due to the disadvantage that the lid of the can can can not be resealed after being pulled open, it is gradually ignored. To this end, several Japanese companies began to arm the revolving bottle cap on the can. This new type of can varies in size. Compared with the previous products, the lower part of the 300 ml can is not much changed, and the upper part becomes a cone with a rotating bottle cap; The shape of a 500 ml can is basically the same as that of a beer bottle. At present, with the gradual popularity of this new type of cans in Japan, consumers are increasingly showing their love for rotating bottle caps: you can safely take a sip, then screw the cap back into your bag. This is something that old-fashioned cans cannot do. Japan's third gb/t 16938 (1) 997 general technical conditions for fasteners bolts, screws, studs and nuts. A relevant person from Mitsubishi materials, a large can manufacturer, said that the new cans have better sealing performance and can effectively prevent drinks from contacting sunlight and oxygen. In addition, its lighter weight is also very conducive to recycling after recovery. Japanese can makers hope to use this product to regain the market occupied by plastic bottles. Daiwa can making company took the lead in developing this kind of cans in the world as early as 1999, and was first adopted by Kirin wheat wine company and other Japanese beverage companies. However, the Coca Cola company's sale of this kind of carbonated beverage in cans on the vending machine in Japan is a major breakthrough in its promotion process. As a result, its sales volume soared from 240million in 2000 to 1.7 billion in 2002, and reached 2billion in 2003. As the cost of new cans is twice that of ordinary cans, some people worry that it cannot be accepted by consumers in other countries, because people in many parts of the world are not willing to spend more money on an attractive package

in August 2004, coin packaging company successfully developed "epol" (easy to open cover). This can cover is heat sealed with polymer coated steel rings and corrosion-resistant aluminum foil, which can be used in existing filling equipment. The aluminum foil cover can be safely opened, which is more suitable for the elderly and children. Japan's Daiwa can making and Takeuchi stamping industries began the research and development of aluminum bottles and cans in 1997. They have successively developed aluminum bottles, cans and beverage containers that maintain the excellent performance of the contents of primary aluminum cans and are easy to recycle. The newly developed aluminum bottles and cans have the following characteristics: (1) compared with the original aluminum cans, the shape is beautiful and fashionable, and can be re sealed, easy to carry, easy to recycle; (2) Compared with PET bottles, the lightproof and barrier properties are greatly improved, and the tank weight is reduced by 30%; (3) The storage performance of the beverage is excellent, and the shelf life is extended. There are some differences in the structure of aluminum bottles and cans between Dahe can making and Wunei stamping industry. The products of Daiwa canning are: diameter 28mm (in order to form this diameter, the bottom of the two-piece can is formed as the mouth); The cover, tank body and bottom cover are all made of aluminum; The weight of aluminum bottles (taking 500ml bottles as an example) is only 67% of that of PET bottles; The inside of the tank and the bottom cover are covered with polyester film, and the inside of the top cover is covered with low-density polyethylene film. The difference between the stamping industry in Wunei and the aluminum bottles and cans made by Daiwa is: the caliber is 38mm; The tank body is designed smoothly and easy to print. After Mitsubishi materials introduced this technology from Wunei stamping industry, it has transformed the third production line of Okayama factory into a special production line for aluminum bottles and cans and entered this field. At present, there is also a kind of coffee self heating can that has been sold in some supermarkets. Researchers are also developing self cooling drink cans for consumers to drink anytime, anywhere. Due to the application of new technologies in the development of aluminum cans, the demand for aluminum cans is likely to further expand in the future, and the new aluminum can packaging will be more eye-catching internationally

v. promote the recycling of aluminum cans

remanufactured aluminum from aluminum cans consumes 71% less energy and 95% less air pollution than extracting aluminum from bauxite. Many countries, especially developed countries, attach great importance to the recycling and utilization of used aluminum cans, and the recycling and reuse rate is also constantly improving. For example, the recycling rate of aluminum cans in the United States has exceeded 50% as early as the 1980s, and 62.1% in 2000. The recycling rate of aluminum cans in Japan is also very high, which was 43% in 1990 and 83% in 2001. At the same time, developed countries pay attention to classification and recycling in the recycling of waste aluminum materials. For example, the United States classifies different waste aluminum materials, sorts waste aluminum profiles and waste aluminum cans, remelt them, and then mix them slightly to produce aluminum profiles and aluminum strips for cans, which greatly reduces the cost

according to the statistics released by the Aluminum Association in 2003, the recycling rate of cans in Brazil, which are stable, high-precision and easy to use, increased from 85% of the previous year to 87% in 2002, ranking first in the world for both medical staff and ordinary people for two consecutive years. According to the association, 9billion cans were recycled in Brazil in 2001, weighing 121100 tons, accounting for 47.8% of the total aluminum reused in Brazil in 2001. In 2002, the turnover of the cans recycling industry reached R $850million (about US $270Million), of which R $424million (about US $130million) was spent on the purchase of cans. At present, 150000 people in Brazil make a living by picking cans. Recycling cans can save a lot of electricity. The electricity consumed by producing aluminum from waste aluminum is only equivalent to 5% of the electricity consumed by refining aluminum from ore. The electricity saved by recycling a can can can be enough to use 20 inch TV for 3 hours. According to the statistics of Brazilian Aluminum Association, in 2002, Brazil saved 1705gw/h of electricity by recycling cans, equivalent to 0.5% of the national electricity consumption in Brazil

the recycling technology of waste cans has developed weakly in China, resulting in huge waste. This has led to a huge amount of foreign exchange in exchange for cans after one-time use, and then declared scrapped, causing a huge waste. At the same time, aluminum cans that cannot be recycled have caused great pollution to the environment. The market is calling for economical raw materials that can replace aluminum cans

at present, the international aluminum price is rising, and the output of domestic aluminum cans has far exceeded the demand. Three of China's 25 aluminum can making enterprises have closed down successively. At present, experiments have proved that once the protective coating falls off during the processing of cans, the aluminum alloy on the inner wall of cans will come into contact with drinks. Over time, aluminum elements will gradually dissolve in them, especially when acidic or alkaline drinks are installed in cans, which is the most harmful to human body. In addition, aluminum cans pollute the environment, the state has issued corresponding policies, clearly indicating that it will no longer approve the new aluminum cans production line. In this case, steel cans and paper cans emerged as the times require, becoming alternative products of aluminum cans

source: Chinese packaging author/Jiang Hong

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