Aluminum Processing: Foil Production
Aluminum foil can be divided into industrial aluminum foil and packaging aluminum foil. Industrial aluminum foil has a relatively pure chemical composition and a thickness of 0.005 to 0.2 mm. Industrial aluminum foil is mainly used as a capacitor, a heat insulating material, a moistureproof material, and the like in the electrical industry and the electronics industry. The thickness of the packaging aluminum foil is generally 0.007 to 0.1 mm, and there are various products such as flat foil, printing foil, color printing foil and crepe aluminum foil. Industrial aluminum foil is mainly used as packaging materials for food, tea, cigarettes and the like. The aluminum foil is produced by a belt production method with a minimum thickness of 0.0025 mm and a width of 1800 mm. The aluminum foil is rolled without roll seam rolling, and the rolls are always in an elastic flattened state. The control of the thickness of the foil is achieved by adjusting the rolling force, the rolling speed and the control tension during rolling. In rough rolling, the thickness of the foil is controlled by rolling force; when the rolling is performed, the thickness of the foil is thinned as the rolling speed increases; the larger the tension, the smaller the thickness; in order to prevent the chip, the tension is usually foil. The conditional yield strength of the material is 0.2 to 0.4 of 0.2. In low-speed rolling, "thick oil" or "thin oil" is often added to the lubricating oil to adjust the rolling thickness of the aluminum foil. Lubricant and roll conditions have a significant impact on the quality of the foil. The aluminum foil blank is from a cold rolled aluminum coil and is generally annealed at 340 to 480 ° C. The thickness of the aluminum foil is 0.4 to 0.7 mm. The rolling deformation rate during rolling is about 50%, and the total deformation rate is over 95%. Foil with a finished thickness of less than 0.01 to 0.02 mm shall be rolled and double rolled.