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Aluminum foil is actually aluminum.
Aluminum is a silvery white light metal. It is malleable. The product is often formed into a rod shape, a sheet shape, a foil shape, a powder shape, a ribbon shape, and a filament shape. An oxide film that prevents corrosion of metals can be formed in humid air. Aluminum powder and aluminum foil are heated in the air to burn violently and give off a dazzling white flame. Soluble in dilute sulfuric acid, nitric acid, hydrochloric acid, sodium hydroxide and potassium hydroxide solution, insoluble in water. The relative density is 2.70. The temperature of 660 ° C. The boiling point is 2327 ° C. It is widely used for its light, good electrical and thermal conductivity, high reflectivity and oxidation resistance. The aluminum used to make a daily dish is usually called "steel" or "steel." Since aluminum is highly active and difficult to be reduced, it was discovered later. After the Italian physicist Volt founded the battery in 1800, the British chemist David and the Swedish chemist Bézilius tried to separate the aluminum from the bauxite from 1808 to 1810, but none of them succeeded. Bezilius gave the name alumien to the metal that was not available. This is from the Latin alumen. The term is a general term for astringent 矾 in medieval Europe, and refers to the mordant used to dye cotton. The later Latin name of aluminum and the element symbol Al came from it. In 1825, the Danish chemist Osd published the experiment to obtain aluminum. In 1827, the German chemist Muller repeated the Osd experiment and continued to improve the method of making aluminum. In 1854, the German chemist Deville used sodium instead of potassium to reduce aluminum chloride to produce ingot metal aluminum.
A hot stamping material which is directly calendered into a sheet by metal aluminum, and its hot stamping effect is similar to that of pure silver foil stamping, so it is also called a fake silver foil. Since aluminum has a soft texture and good ductility, it has a silvery white luster. If the calendered sheet is smashed on an offset paper with a material such as sodium silicate, an aluminum foil sheet can be formed, and printing can be performed. However, the aluminum foil itself is easily oxidized and the color is darkened, and friction, touch, and the like are discolored, so it is not suitable for hot stamping of a book cover that has been preserved for a long time.
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Overview of the classification of aluminum foil according to the thickness according to the shape of the surface state according to the state of the state of the aluminum foil classification according to the thickness according to the shape according to the surface state according to the state of addition. Edit this paragraph Overview of aluminum foil due to its excellent characteristics, widely used in food, beverages, cigarettes Packaging materials for medicines, photographic bases, household items, etc.; electrolytic capacitor materials; thermal insulation materials for buildings, vehicles, ships, houses, etc.; also can be used as decorative gold and silver lines, wallpapers, and various stationery and light industrial products. Trademarks, etc. Among the above various applications, the most effective performance of the aluminum foil is as a packaging material. Aluminum foil is a soft metal film, which not only has the advantages of moisture-proof, air-tight, light-shielding, abrasion resistance, fragrance preservation, non-toxic and tasteless, but also because it has an elegant silver-white luster, it is easy to process beautiful patterns of various colors and The pattern is therefore more susceptible to people's aluminum foil tape. In particular, after the aluminum foil is combined with plastic and paper, the shielding property of the aluminum foil is integrated with the strength of the paper and the heat sealing property of the plastic, thereby further improving the shielding performance for water vapor, air, ultraviolet rays and bacteria which are necessary as packaging materials. , greatly expanded the application market of aluminum foil. Since the packaged article is sufficiently isolated from the outside, such as light, moisture, gas, etc., the package is well protected. Especially for the packaging of retort foods, the use of this composite foil material can at least guarantee that the food does not deteriorate for more than one year. Moreover, heating and unpacking are very convenient and popular among consumers. With the improvement of people's living standards and the development of tourism, the demand for beverages and canned foods such as beer and soda is increasing. These require modern packaging and decoration to facilitate competition in the international market. In recent years, in order to meet market requirements, packaging materials such as plastic film and spray foil have been developed, but their overall performance is not as good as that of overcoating and lamination. Therefore, it can be said that aluminum foil is a perfect packaging material with various excellent properties, and it has fully demonstrated its broad application prospect in many fields. In order to improve rolling efficiency and quality of aluminum foil products, modern aluminum foil rolling mills have developed in four directions: large volume, wide width, high speed and automation. The width of the roll of the contemporary aluminum foil rolling mill has reached 2200mm or more, the rolling speed has reached 2000m/min or more, and the coil weight has reached 20t or more. The corresponding level of rolling mill automation has also been greatly improved, the thickness control system (AGC) has been installed, and most of them have installed the shape meter (AFC). The aluminum foil industry is facing a period of rapid development.
Chemical properties of aluminum foil
Chemical properties of aluminum foil