With a metal aluminium rolling into thin slices of hot stamping material directly, the hot stamping effect is similar to the effect of silver foil stamping, therefore is also called the fake silver foil. As a result of the aluminum is soft, good ductility, has a silver sheen, if the sheets after rolling, with sodium silicate materials such as aluminum foil on the offset paper made of paper mounted, also can be printed. But easy oxidation of aluminum foil itself and a dark, friction, touch can rub off, therefore not suitable for long-term preservation of books and periodicals cover, hot stamping.
Aluminum foil because of its excellent characteristics, widely used in food, drinks, cigarettes, drugs, photographic plate, household products and other packaging materials; Electrolytic capacitor materials; Buildings, vehicles, ships, houses and other insulation materials; Also can be used as the gold and silver line decoration, wallpaper and all kinds of stationery printing and packaging trademark of light industrial products, etc. In the above a variety of purposes, is the most effective use of the aluminum foil performance points can be as packaging material. Aluminum foil is soft metal film, not only has the moisture, airtight, shading, resistant to abrasion, incense, and the advantages of non-toxic, tasteless, but also because it has elegant silvery white gloss, easy to work out all sorts of color of beautiful design and decorative pattern, and therefore more vulnerable to the favour of people. Especially when the composite aluminum foil with plastic and paper, aluminum foil shielding and the strength of paper, plastic heat sealing, necessary to further improved as packing material for steam, air, bacteria and ultraviolet shielding performance, greatly broaden the application market of aluminum foil. Due to the light of the items in the package with the outside world, wet, gas and other full isolation, making packing materials are protected by the intact. Especially for cooking food packaging, the use of this composite foil material, at least can guarantee food more than one year is not bad. Moreover, heating and open bag is very convenient, is popular among consumers.
With the improvement of people’s living standard and the development of tourism, beer, soft drinks and other beverages and canned food demand is increasing, the modern packaging and decoration, would have to be on the international market competition. In order to adapt to market demand, in recent years, people developed a plastic film and coating with good sex of shielding foil packing material such as, but they are less than the comprehensive performance of coating and laminating processing can be make up and improve. So it can be said that the aluminum foil is has many excellent properties, more perfect packaging materials, in many areas are fully shows its broad prospect of application.
In order to improve the quality of rolling efficiency and aluminum foil products, modern aluminum foil rolling mill to the large volume, wide, high speed, automation development in four directions. Contemporary aluminum foil rolling mill roll width has amounted to more than 2200 mm, rolling speed reach above 2000 m/min, heavy volume reached more than 20 t. Corresponding mill also greatly improve the automation level, generally installed the thickness control system (AGC), most of the installation of the flatness gauge (AFC). Aluminum foil industry is facing a period of rapid development.
The classification of the aluminum foil
According to the thickness
Aluminum foil can be divided by thickness difference thick foil, single zero foil and double zero foil. 1) thick foil: foil thickness of 0.1 ~ 0.1 mm. (2) single zero foil: thickness of 0.01 mm and less than 0.1 mm/foil. (3) double zero foil: the so-called double zero foil is in its thickness measuring unit for mm after the decimal point two zero foil, usually the thickness less than 0.01 aluminum foil, aluminum foil is 0.005 ~ 0.009 mm. To express in English, thick foil known as the “heavy gaugefoil ‘ ‘, single zero foil is called” medium gaugefoil “, double zero foil “lightgaugefoil ‘ ‘. Abroad sometimes called the thickness of 40 LTM aluminum foil or less light the gauge foil, and the aluminum foil thickness > 40 BTM are collectively referred to as heavy gaugefoil.
According to the shape
Aluminum foil can be divided by shape rolled aluminum foil and sheet of aluminum foil. Aluminum foil deep processing of wool roll most is supply, only a handful of handicraft industry with flake aluminum foil packing occasions. Hard foil, aluminum foil according to the state can be divided into half hard foil and soft foil. Hard foil (1) : after rolling aluminum foil without softening (annealing) without degreasing process, the surface has the residual oil. So hard foil must be degreased before printing, laminating, coating processing, if used for forming can be used directly. (2) half hard foil: aluminium foil hardness (or intensity) in hard foil and soft foil between the aluminum foil, is usually used in forming processing. (3) soft foil: after rolling after full annealing and soft aluminum foil, material is qualitative soft, surface without residual oil. Most current applications, such as packaging, composite, electrical material, use soft foil.
According to the surface state
Aluminum foil can be divided by surface state side light aluminum foil and aluminum foil please both parties. (1) single light aluminum foil: receives rolling aluminum foil, side light, after volume classification – surface hair black, such as aluminum foil as a light aluminum foil. Side light aluminum foil thickness is usually not more than o. 025 mm. (2) light double-sided aluminum foil, sheet rolling aluminum foil, two paintings and roll contact, both sides of the aluminum foil for roll surface roughness is divided into different lens face 2 face light aluminum foil and ordinary 2 face light aluminum foil. Two surface optical thickness of aluminum foil is generally not less than 0.01 mm.
According to add state
Aluminum foil can be divided by combined with state plain foil, embossing, foil, composite foil, paint coating foil, aluminum foil and aluminum foil printing. (1) plain foil: after rolling without any other processing of aluminum foil, foil is also called light. (2) the embossed foil: there are all sorts of decorative pattern on the surface pressure of aluminum foil. (3) composite foil: aluminium foil and paper, plastic film, paper board fit in – formation of the compound aluminum foil. (4) coating foil: are painted all kinds of resin or on the surface of the aluminum foil. (5) coloring of aluminum foil, aluminum foil surface coated with a single color. 6 printing foil: by printing on the surface to form a variety of decorative pattern, design, text or pictures of aluminum foil, can is a kind of color, one of the most up to 12 kinds of color.