Aluminum foil generally refers to rolled products with a thickness of less than 0.2mm and a rectangular cross-section. According to the production process, it can be divided into rolled foil and vacuum deposited foil; according to its use, it is mainly divided into industrial aluminum foil for packaging and aluminum foil for capacitors.

Aluminum foil has a series of advantages such as light weight, airtightness and good cladding. Its main functional characteristics: it can be supplied in sheets or in rolls; it has strong corrosion resistance. There is a thin and dense oxide film on the surface of aluminum foil, which has a strong Excellent corrosion resistance, good compatibility with food, medicine and cosmetics, not only non-toxic, but also quite strong corrosion resistance to various liquid compounds; good forming performance, can be completely folded at will;
Non-hygroscopic, with strong waterproof and anti-infiltration ability of various liquids;
Strong hygienic performance, can be heat-treated in the production process to make sterile materials, smooth surface, easy to remove impurities and adsorbed moisture generated during the disinfection process;
Sterilizable, unaffected by heat and water during disinfection, but will leave harmless marks in some cases; non-toxic, will not react with most foods, drugs, cosmetics, chemical products and industrial products or generate harmful compounds;
Odorless, the surface will not absorb perceivable odors; good opacity, light will not pass through; stability, stable in many media under most environmental conditions, will not corrode; tightness Strong, can be bonded with a variety of films to form a composite material with strong airtightness; low magnetism, it is a good electromagnetic shielding material;
No sparking, aluminum foil is a preferred metal material that can be used in contact with volatile vinyl compounds; strong recyclability, most aluminum foil used for packaging is almost impossible to recycle, but such as air conditioning foil, semi-steel food Boxes, etc. have strong recyclability; no pollution to the environment, the aluminum foil mixed in the garbage will not produce substances harmful to the environment, and will not produce pollutants when incinerated [2

Due to the good functional characteristics of aluminum foil products, it has been widely used in many sectors of the national economy and people’s daily life. I kēia manawa, it is mainly used in the three major fields of packaging, electromechanical and construction, among which the demand for packaging is the largest (cigarettes) , pharmaceuticals, food flexible packaging, disposable utensils), accounting for about 60%, followed by electrical use, accounting for about 30%, and aluminum foil for construction accounts for 10%.

With the continuous development of industrial production and science and technology, the production and use of aluminum foil are becoming more and more extensive.