Preparation method of high-strength tableware aluminum foil

Abstract

The invention discloses a preparation method of high-strength tableware aluminum foil. The preparation method comprises the following steps that electrolytic aluminum liquid and an aluminum ingot are smelted into an aluminum melt, an aluminum foil coil with the thickness of 3-5 mm is prepared through a continuous casting process and a continuous rolling process, and then the aluminum foil coil is subjected to cold rolling, longitudinal shearing and side shearing, foil rolling, finished product slitting, finished product annealing and inspection and packaging to prepare the high-strength tableware aluminum foil, wherein the longitudinal shearing and edge shearing, the finished product slitting and the inspection and packaging are carried out according to conventional processes, an aluminum foil roll with the thickness of 0.05-0.095 mm after the finished product annealing is made into the tableware aluminum foil, and after detecting, the tensile strength of the tableware aluminum foil is larger than or equal to 220 Mpa, the elongation rate is larger than or equal to 6%, and the cupping value is larger than or equal to 4 mm. According to the preparation method, the casting process and the secondary remelting process of the aluminum ingot are omitted, and measurement shows that 0.4-0.5% of aluminum loss can be reduced during the process that the aluminum liquid is cast into the aluminum ingot, 2-4% of the aluminum burning loss can be reduced during the secondary remelting process of the aluminum ingot, the energy is saved, and the production efficiency and the finished product ratio are improved.

Description

technical field [0001] The invention belongs to the technical field of aluminum foil processing, in particular to a preparation method of high-strength tableware aluminum foil. Background technique [0002] Tableware aluminum foil is also commonly known as container foil. It is an aluminum foil widely used in aviation food, fast food packaging and other fields. It is beautiful, generous, clean and hygienic. At present, the common alloys used in the production of container foils in the market are 8011, 3003 and so on. However, although this type of alloy has good plastic deformation ability, its strength is generally between 120 and 150Mpa. The lower strength causes the aluminum foil to be easily deformed and damaged after being stamped into a lunch box. However, if you want to maintain the good anti-deformation ability of the lunch box, you must increase the thickness of the aluminum foil, resulting in material waste. [0003] 3004 alloy has become the first choice for the...

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Problems solved by technology

[0023] The tensile strength of the aluminum foil prepared by this process can reach 220Mpa, but due to factors such as many production

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