Which side aluminium foil

A large block of almost pure aluminum is rolled through giant steel rollers, several times, reducing the thickness of the aluminum block and spreading it out to make it longer.

Lubricants are added to facilitate the operation. At each successive pass through the rollers, the thickness is reduced. The process is repeated until foil thickness is reached, and the large flat sheet is then split into the desired widths.

This may seem simple enough, but the actual process can be tricky. For example, as the aluminum is rolled out, it heats up. If it heats up too much, it can stick to the rollers, so the roller pressure must be carefully controlled. Once the sheet of aluminum is 5mm thick, it must be rolled again in the cold-rolling stage. First, the sheet is spooled into a roll and then it is fed into the cold-rolling mill for the final stage of milling.

It is at this point that the shiny and dull sides of the aluminum are created. Since the aluminum is now so thin, the tension needed to feed it through the cold rollers could easily break it.

So, the sheet is doubled. The sides of the aluminum that come in contact with the steel rollers become more polished and shiny, and the sides of the aluminum that come in contact with itself become duller.

Foil is no longer made out of tin as it is more expensive and less durable than aluminum. However, the term tin foil is used for aluminum foil in many regions, including by some in the United States. The information on this page, then, applies to both aluminum foil and tin foil as both terms refer to the same product.

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Type keyword s to search. Today's Top Stories. All of the Best Chocolate Advent Calendars. On Reynold's FAQ page , the company gets into the nitty gritty over why one side is shiny and one is dull: "This is a common question and the answer is that the foil is "milled" in layers during production.