Processing technique of metallized film

Abstract

The invention relates to a processing technique of a metallized film. Corona discharge pretreatment is conducted on an insulating base film twice, and then primary evaporation, surface treatment of a zinc coating, secondary evaporation, and surface treatment of an aluminized coating are conducted, so that the metallized film is obtained. The bonding strength of a metal layer of the metallized film and the insulating base film is high, and the alternating voltage resistance is remarkably improved; the metal layer is of a four-layer structure including the zinc coating, an zinc oxide coating, the aluminized coating and an oxide film so that the corrosion rate of the metal layer can be effectively decreased, the capacity of a capacitor cannot be decreased even if the zinc coating is corroded, the adaptability to high high-voltage alternating currents cannot be affected, insulating defects are avoided, and the breakdown accidents are avoided; and according to the processing technique of the metallized film, the processing technique is simple, the loss of the zinc coating is reduced, the production efficiency is high, the production cost is low, and the service life of the metallized film is long.

Description

technical field [0001] The invention relates to a metallized film processing technology, which belongs to the technical field of capacitors. Background technique [0002] Energy shortage and environmental degradation have become global problems that threaten human survival. The development of new energy is the only way to achieve sustainable human development. Shift to clean energy. [0003] It will be the future development trend of the power industry to gradually replace traditional energy with new energy for power generation. New energy power generation mainly includes solar power generation, wind power generation, biomass power generation, geothermal power generation, tidal power generation, etc. [0004] Urban rail transit refers to a mode of transportation with the characteristics of large volume, high speed, safety, punctuality, environmental protection, energy saving and land use, including subway, light rail, maglev, express rail, tram, new transportation system, e...

AI Technical Summary

Problems solved by technology

[0007] The commonly used metallized film is to vapor-deposit a layer of aluminum coating on the insulating base film. The aluminum-coated metallized film has good adhesion performance, and the production process is easy to handle, but the aluminum-coated metallized film is easily oxidized in the air. And form a dense oxide layer with aluminum oxide as the main component. Although this oxide layer can prevent the metallized film from being oxidized further, when working under AC high voltage and high current, this oxide layer will lead to a rapid decline in the capacity of the capacitor.

After the galvanized metallized film is oxidized in the air, although the adaptability to AC high-voltage and large current will not drop sharply, the adhesion between the galvanized layer and the insulating base film is lower than that between the aluminum-plated layer and the insulating base film. The adhesion between the films, and the oxidation speed of the galvanized layer is fast, the zinc oxide formed by oxidation has a fluffy structure, it is difficult to prevent further oxidation, and it is easy to form insulation defects on the insulating base film, so the metallized film galvanized layer is not only It is difficult to handle during processing, and it is easy to cause accidents of heating or even breakdown of capacitors

For this reason, a layer of aluminum is plated on the basis of metallized film firstly coated with aluminum and then galvanized, so as to protect the galvanized layer of the metallized film. The total thickness of the single-layer galvanized layer and the thickness control of the aluminum-coated layer need to be thinner and more precise, and the production is difficult; and the melting and boiling point of aluminum is higher than that of zinc. When a layer is coated on the galvanized layer When aluminum is used, the surface structure of the galvanized layer is easily damaged, and part of the zinc on the surface of the galvanized layer will be lost, resulting in waste

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