Classification of aluminum foils There are several methods for classifying aluminum foils, which can be classified according to the thickness, shape, state or material of the aluminum foil. Aluminum foil can be divided into thick foil, single zero foil and double zero foil according to the thickness difference. 1 thick foil: a foil having a thickness of 0.1 to 0.2 mm. 2 Single zero foil: a foil having a thickness of 0.01 mm and less than 0.1 mm/. 3 double zero foil: The so-called double zero foil is a foil with two zeros after the decimal point in the thickness of mm, usually aluminum foil with a thickness less than 0.0075mm. When expressed in English, the thick foil is called "heavy gaugefoil", the single zero foil is called "medium gaugefoil", and the double zero foil is called "lightgaugefoil". In foreign countries, aluminum foil with thickness ≤ 40 ltm is sometimes referred to as light gauge foil, and aluminum foil with thickness > 40 btm is collectively referred to as heavy gauge foil. The aluminum foil can be divided into a rolled aluminum foil and a sheet aluminum foil according to the shape. Most of the aluminum foil deep-processing wool is supplied in rolls, and only a few hand-made industrial packaging uses sheet-like aluminum foil. Aluminum foil can be classified 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, the hard foil must be degreased before printing, lamination, coating, and can be used directly if it is used for forming. 2 semi-hard foil: aluminum foil hardness (or strength) between the hard foil and the soft foil, usually used for forming. 3 soft foil: aluminum foil which is softened after being fully annealed after rolling, the material is soft and there is no residual oil on the surface. At present, most applications, such as packaging, composites, electrical materials, etc., use soft foil. The aluminum foil can be divided into a light aluminum foil and a double-sided aluminum foil according to the surface state. 1 one-sided aluminum foil: double-rolled aluminum foil, after the split, one side is bright, and the surface is black. Such aluminum foil is called a light aluminum foil. The thickness of a piece of light aluminum foil usually does not exceed o. 025mm. 2 two-sided aluminum foil: single-rolled aluminum foil, two paintings and roll contact, the two sides of the aluminum foil are divided into mirror two-sided aluminum foil and ordinary two-sided aluminum foil due to different surface roughness of the roll. The thickness of the two-sided aluminum foil is generally not less than 0.01 mm. Aluminum foil can be divided into plain foil, embossed foil, composite foil, coated foil, colored aluminum foil and printed aluminum foil according to the state of addition. 1 plain foil: other processed aluminum foil after rolling, also called light foil. 2 embossed foil: aluminum foil with various patterns on the surface. 3 composite foil: a composite aluminum foil formed by laminating aluminum foil and paper, plastic film and cardboard. 4 coated foil: aluminum foil coated with various types of resin or lacquer on the surface. 5 color aluminum foil: the surface is coated with a single color of aluminum foil. 6 Printing aluminum foil: Aluminum foil which is formed by printing various patterns, patterns, characters or pictures on the surface, which can be one color, up to 12 colors. The soft aluminum foil can be further pressed into a four-zero foil for high-grade decoration.