Aluminium foil foil rolling mills to the desired thickness, or by continuously casting and cold rolling. To maintain a constant thickness in aluminium foil production, beta radiation is passed through the foil to a sensor on the other side. If the intensity becomes too high, then the rollers adjust, increasing the thickness. If the intensities become too low and the foil has become too thick, the rollers apply more pressure, causing the foil to be made thinner. The continuous casting method is much less energy intensive and has become the preferred process. For thicknesses below , two layers are usually put together
Foil stamping Foil stamping Foil stamping, (also known as foil application) typically a commercial printing process, is the application of metallic or pigmented foil on to a solid surface by application of a heated die onto foil, making it permanently adhere to the surface below leaving the design of the die. In the process known as hot foil stamping, foil stamping machines uses heat to transfer metallic foil to a solid surface. Examples of items that are foil stamped include annual reports, pocket folders, product packaging, note cards/thank you cards, business cards, envelopes and letterhead. The foil stamp is a permanent process.