A hot stamping material made of metal aluminum directly rolled into thin sheets. Its hot stamping effect is similar to that of pure silver foil, so it is also called fake silver foil. Because aluminum has a soft texture, good ductility, and a silvery white luster, if the calendered sheet is mounted on offset paper with sodium silicate and other substances to make aluminum foil, it can also be printed. However, aluminum foil itself is easy to oxidize and darken in color, and will fade when rubbed or touched, so it is not suitable for hot stamping of long-term preservation of book covers, etc.
Classification of aluminum foil:
by thickness
Aluminum foil can be divided into thick foil, single zero foil and double zero foil according to thickness difference.
①Thick foil: foil with a thickness of 0.1~0.2mm.
②Single zero foil: foil with a thickness of 0.01mm and less than 0.1mm/.
③Double-zero foil: The so-called double-zero foil is a foil with two zeros after the decimal point when its thickness is measured in mm. It is usually an aluminum foil with a thickness less than 0.01, that is, an aluminum foil with a thickness of 0.005~0.009mm.
by shape
Aluminum foil can be divided into roll aluminum foil and sheet aluminum foil according to its shape. Aluminum foil deep processing wool is mostly supplied in roll form, and sheet aluminum foil is only used in a few handicraft packaging situations.
Aluminum foil can be divided into hard foil, semi-hard foil and soft foil according to the state.
① Hard foil: Aluminum foil that has not been softened (annealed) after rolling and has no residue on the surface without degreasing. Therefore, rigid foil must be degreased before printing, lamination, and coating. If it is used for forming processing, it can be used directly.
② Semi-hard foil: Aluminum foil whose hardness (or strength) is between hard foil and soft foil, usually used for forming processing.
③Soft foil: Aluminum foil that has been fully annealed and softened after rolling. The material is soft and there is no residual oil on the surface. Currently, most application fields, such as packaging, composites, electrical materials, etc., use soft foils.
According to surface state
Aluminum foil can be divided into one-sided smooth aluminum foil and two-sided smooth aluminum foil according to its surface condition.
①Single-sided smooth aluminum foil: Double-rolled aluminum foil. After being rolled, one side is bright and the other side is dark. Such aluminum foil is called one-sided smooth aluminum foil. The thickness of one side of plain aluminum foil usually does not exceed o. 025mm.
②Double-sided aluminum foil: A single rolled aluminum foil, with two sheets in contact with the rollers. The two sides of the aluminum foil are divided into mirror double-sided aluminum foil and ordinary double-sided aluminum foil due to the different surface roughness of the rollers. The thickness of double-sided aluminum foil is generally not less than 0.01mm.
