“The (aluminium) bar is transported
to Downey, California (from Pinjarra, Western Australia), where it is
rolled flat in a rolling mill, and turned into aluminium sheets. The
sheets are punched into circles and shaped into a cup by a mechanical
process called drawing and ironing – this not only makes the can
but also thins the aluminium. The transition from flat circle to
something that resembles a can takes about a fifth of a second. The
outside of the can is decorated using a base layer of utherane
acrylate, then up to seven layers of colored acrylic paint and
varnish that is cured using ultra violet light, and the inside of the
can is painted too – with a complex chemical called a comestible
polymeric coating that prevents any of the aluminium getting into the
soda. So far, this vast tool chain has only produced an empty, open
can with no lid.”
from here
pic from here
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