Electrolytic capacitor aluminum foil continuous annealing process

Abstract

The invention discloses a continuous annealing process for aluminum foil of an electrolytic capacitor, which belongs to the technical field of heat treatment of nonferrous metals. The invention proposes a new annealing process based on a protective atmosphere continuous annealing furnace in a rapid manner. During the annealing process, the aluminum coils are opened and heated in a continuous furnace with a protective atmosphere from the beginning to the end. The control range of the line speed to the exit of the furnace is 0.1-80 meters per minute; during the heating stage in the furnace, the aluminum foil heats up at a speed of 5-600 °C per minute, and the temperature range is 180-600 °C; Keep warm at the temperature, and the time for each place is 1 to 600 minutes; after the heat preservation, the cooling speed is 5 to 600 ° C per minute. The invention has the characteristics of fast annealing speed, high production efficiency, high temperature control precision and uniform annealing of aluminum foils in various parts of the aluminum coil, and is suitable for use in aluminum foil production enterprises for electrolytic capacitors.

Description

technical field [0001] The invention belongs to the field of heat treatment of nonferrous metals. Background technique [0002] High-purity aluminum foil is widely used in the industry to make aluminum electrolytic capacitors. In its processing and manufacturing, aluminum foil has to go through different stages of heating and annealing. Conventional packaging aluminum foil usually needs to be annealed to achieve the purpose of softening the aluminum foil. The annealing process of aluminum foil for electrolytic capacitors developed in recent years is not only to soften the aluminum foil, but also to obtain the required structure and texture of the aluminum foil with the help of an appropriate annealing heating process. At present, electrolytic capacitor aluminum foil manufacturers generally adopt the annealing method of packaging aluminum foil, that is, vacuum annealing of aluminum foil rolls in rolls, or annealing in protective atmosphere in rolls, in order to soften the a...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems of low production efficiency and inhomogeneity in the existing annealing process of aluminum foil coils for electrolytic capacitors, the present invention proposes a rapid annealing process based on a protective atmosphere continuous annealing furnace, which can not only shorten the annealing time, Moreover, it can significantly improve the uniformity of the structure and texture of the annealed aluminum coil

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