Due to its excellent properties, aluminum foil is widely used in food, beverages, cigarettes, medicines, photographic plates, household necessities, etc., and is usually used as packaging materials; electrolytic capacitor materials; thermal insulation materials for buildings, vehicles, ships, houses, etc.; and can also As decorative gold and silver threads, wallpapers, various stationery prints and decorative trademarks for light industrial products, etc. In recent years, with the characteristics of aluminum foil, it has been increasingly used in industrial production: battery foil, air-conditioning foil, pharmaceutical foil, etc. This has increasingly stringent requirements for aluminum foil manufacturers, but various problems will occur during the production process. Various quality defects, the characteristics and causes of various quality defects are sorted out.
Aluminum foil bruises refer to the damage caused to the surface or end face of the foil after colliding with other objects during transportation or storage. Brushes are mostly caused by carelessness when packaging aluminum foil.
Corrosion: Defects occur on the surface of the aluminum foil after a chemical or electrochemical reaction occurs when the aluminum foil surface comes into contact with the surrounding medium. The corroded aluminum foil surface will lose its luster, and in severe cases, gray corrosion products will be produced. The corroded aluminum foil will have a great impact on the aesthetics of the products produced by the terminal.
Surface bubbles: Aluminum foil with surface bubble defects will have irregular circular or strip-shaped cavity bulges on the surface of the foil; the edges of the bulges are rounded, asymmetrical on both sides, and the distribution is irregular. The surface bubbles make the aluminum foil strips at various points Unbalanced force may cause breakage and shutdown.
Dark side stripes Dark side stripes mostly appear on double-joint products. The dark side has obvious light and dark striped patterns along the rolling direction, which affects the appearance.
·cause:
a) The grain size of the billet is not refined enough;
b) The intermediate annealing process of wool is unreasonable;
c) The alloy composition of the billet is unreasonable.
Marks There are many situations that can cause marks to appear on the surface of aluminum foil, such as defects on the surface of the roller or guide roller or dirt such as metal shavings, unclean surfaces of the sleeve or tube core or local smooth bulges, or foil materials during winding. There are foreign objects stuck on the surface, etc. The surface of the foil where marks appear will generally have single or periodic depressions or ridges that are easy to identify.
