The lightweight progress of aluminum can lids

The lightweight progress of aluminum can lids is also obvious.

The thickness of the aluminum can lid has dropped from 0.39 mm in the early 1960s to 0.36 mm in the 1970s, dropped to 0.28 mm to 0.30 mm in 1980, and 0.24 mm in the mid-1980s. The diameter of the can lid has also been reduced. The weight of the can lid has been decreasing. In 1974, the weight of a thousand aluminum cans was 13 pounds, in 1980 it was reduced to 12 pounds, in 1984 it was reduced to 11 pounds, in 1986 it was reduced to 10 pounds, and in 1990 and 1992 it was reduced to 9 pounds and 9 pounds respectively. 8 pounds, reduced to 6.6 pounds in 2002. The can-making speed has been greatly improved, from 650-1000cpm (only per minute) in the 1970s to 1000-1750cpm in the 1980s and more than 2000cpm now.