How do they make tin foil?

Answer 1

Aluminum foil is made by passing aluminum through a rolling mill. Manufacturers start with a large block several inches thick and several feet wide and long. This block is passed through a rolling mill and is repeatedly hot rolled until it is thin enough for the aluminum to be rolled. The roll is then passed along to another rolling mill and is cold rolled repeatedly until the desired thickness of foil is achieved. In the cold rolling process, two rolls of aluminum are rolled simultaneously to avoid any tearing that might result if a single thickness of aluminum was passed through the rollers. (That's why the foil we see has a "shiny" side and a "dull" side.) Following all this rolling, the aluminum is trimmed and cut to size, and then comes out in the form of the foil we know. Use the link below to see a short video of the process. It's worth the look.