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Aluminum cans have developed rapidly

     Aluminum beverage cans first appeared in the late 1950s. Aluminum cans have developed rapidly. By the end of this century, the annual consumption has reached more than 180 billion, which is more than the total amount of metal cans in the world (about 400 billion). The largest category. The consumption of aluminum used to manufacture aluminum cans also grew rapidly. In 1963, it was nearly zero, and reached 3.6 million tons in 1997, which is equivalent to 15% of the total amount of aluminum used in the world.

     The United States is the world's largest producer and consumer of aluminum beverage cans. The number of aluminum cans used in the United States exceeded 62 billion in 1984 and over 100 billion in 1994. American aluminum cans are mainly used to package beverages. For example, in 1992, the volume of beverage aluminum cans was 92.8 billion, accounting for 97% of the total beverage cans of 95.7 billion that year, and tin cans were only 2.9 billion, accounting for 3%. In 2001, the consumption of aluminum cans for beer and soft drinks in the United States was nearly 100 billion, of which 64 billion were soft drink cans and 33 billion beer cans. The output of aluminum cans in Japan has been increasing for many years, from 3 billion in 1985 to 5.5 billion in 1987, 10.2 billion in 1991, and 16.6 billion in 1997. Most of the aluminum cans are beer cans. For example, in 1997, there were 9.5 billion, accounting for 57%, 3.5 billion carbonated beverage cans, accounting for 21%, and other beverage cans 3 billion, accounting for 18%.
        Since the mid-1980s, the European beverage can market has been showing steady growth. In 1990, the consumption of beverage cans in Europe exceeded 20 billion for the first time, and exceeded 30 billion in 1995. In 1996, it dropped by 2%, from 32.2 billion in the previous year to 31.6 billion. In 1997, the European beverage can market resumed steady growth, with an annual growth rate of 5%, and total consumption rose to 33.5 billion, the highest level in history. The consumption of aluminum cans in Central and South America is also relatively large, nearly 20 billion per year. The annual consumption of aluminum cans in Asia (except Japan) is no less than 20 billion. The consumption of aluminum cans in China is now more than 8 billion per year.

      For decades, the manufacturing technology of aluminum cans has been continuously improved. The weight of aluminum cans has been greatly reduced. In the early 1960s, the weight of each thousand aluminum cans (including the can body and the lid) reached 55 pounds (approximately 25 kilograms), and it was reduced to 33 pounds in the late 1990s ( 15 kilograms), it has now been reduced to less than 30 pounds, which is nearly half of that 40 years ago. In the 20 years from 1975 to 1995, the number of aluminum cans (12 ounces in capacity) made of 1 pound of aluminum increased by 35%. The aluminum material needed for every thousand aluminum cans was reduced from 25.8 pounds in 1988 to 22.5 pounds in 1998 and then reduced to 22.3 pounds in 2000. U.S. can-making companies continue to make breakthroughs in seaming machinery and other technologies, so the thickness of aluminum cans in the United States has dropped significantly, from 0.334 mm in 1984 to 0.259 mm in 1998.

     Lightweight progress in aluminum can lids is also obvious. The thickness of the aluminum can lid dropped from 0.39 mm in the early 1960s to 0.36 mm in the 1970s, and to 0.24 mm in the mid-1980s. The diameter of the can lid has also been reduced. The weight of can lids has continued to decrease. In 1974, the weight of a thousand aluminum cans was 13 pounds, which was reduced to 10 pounds in 1986, and to 6.6 pounds in 2002.

      Many countries, especially developed countries, attach great importance to the recycling and utilization of used metal cans, and the recycling rate of metal cans is also increasing. For example, the recycling rate of aluminum cans in the United States exceeded 50% in the 1980s and was 62.1% in 2000. The recycling rate of aluminum cans in Japan increased from 43% in 1990 to 79% in 1999 and 83% in 2001.

      Aluminum enterprises have been relatively mature. They can produce high-speed mass production through electrolytic aluminum, and aluminum has strong plasticity. It can be easily transformed into alloys with different other metals. The hardness, plasticity and even memory of aluminum (that is, the ability to recover after deformation) All have been greatly improved (aluminum cans have good memory, and are generally not deformed in the hand. Aluminum alloy windows have been used by many families. Most of the food packaging is tin-aluminum alloy, because it is easy to process and easy to tear off. , High plasticity), aluminum alloy can be said to be a cheap metal with a wide range of uses.

     For decades, the manufacturing technology of aluminum cans has been continuously improved. The alloys commonly used in aluminum alloy cans are 5182 aluminum plate, 5052 aluminum plate, 3004 aluminum plate, and 3104 aluminum plate.

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