Aluminum foil is a kind of hot stamping material with metal aluminum directly calendered into thin sheets. Its hot stamping effect is similar to that of pure silver foil, so it is also called false silver foil. Because of the soft texture of aluminum, good ductility, with silver luster, if the calendered sheet, with sodium silicate and other substances mounted on offset paper to make aluminum foil, can also be printed. However, aluminum foil itself is easy to oxidize and the color becomes dark, friction, touch and so on will fade, so it is not suitable for the hot stamping of books and periodicals cover for a long time.
Because of its excellent characteristics, aluminum foil is widely used in food, beverages, cigarettes, drugs, photographic plates, household daily necessities, etc., usually used as its packaging materials; Electrolytic capacitor material; Insulation materials for buildings, vehicles, ships, houses, etc.; Can also be used as decorative gold and silver thread, wallpaper and all kinds of stationery printing and light industrial products of the decoration trademark. Among the above various uses, the most effective performance of aluminum foil is as a packaging material. Aluminum foil is a soft metal film, not only has the advantages of moisture-proof, airtight, shading, abrasion resistance, fragrance preservation, non-toxic and tasteless, but also because of its elegant silver gloss, easy to process a variety of colors of beautiful patterns and patterns, so it is more likely to be favored by people. Especially after aluminum foil and plastic and paper composite, the shielding of aluminum foil and the strength of paper, plastic heat sealing integration, further improve the shielding performance of water vapor, air, ultraviolet and bacteria necessary as packaging materials, greatly expand the application market of aluminum foil. Because the packaged goods are fully isolated from the outside light, moisture, gas, etc., so that the packaging is well protected. Especially for the packaging of cooking food, the use of this composite aluminum foil material, at least can ensure that the food does not deteriorate for more than a year. Moreover, it is very convenient to heat and open the package, which is popular with consumers.
Characteristics of aluminum foil:
Aluminum foil has a clean, hygienic and shiny appearance, it can be made into integrated packaging materials with many other packaging materials, and the surface printing effect of aluminum foil is better than other materials, in addition to aluminum foil has the following characteristics:
(1) Aluminum foil surface is extremely clean, sanitary, any bacteria or microorganisms can not grow on its surface.
(2) Aluminum foil is a non-toxic packaging material, it can be in direct contact with food without any danger to human health.
(3) Aluminum foil is a tasteless and odorless packaging material, which will not make the packaged food have any odor.
(4) If the aluminum foil itself is not volatile, it itself and the packaged food will not dry or shrink.
(5) No matter at high temperature or low temperature, there will be no oil penetration of aluminum foil.
(6) Aluminum foil is a kind of opaque packaging material, so it is a good packaging material for products irradiated by sunlight, such as margarine.
(7) Aluminum foil has good plasticity, so it can be used to package products of various shapes. Can also be arbitrary to create a variety of shapes of containers.
(8) The hardness of aluminum foil is large, the tension strength is also large, but its tearing strength is small, so it is easy to tear.
(9) Aluminum foil itself can not be heated and sealed, must be coated on its surface of thermal materials, such as pe to heat closed.
(10) Aluminum foil may have adverse reactions when it comes into contact with other heavy metals or heavy metals.