Production technology of metallized film

Abstract

The invention relates to a production technology of a metallized film. The production technology is characterized in that an insulation base film is performed with an insulation base film pretreatment technology, a primary evaporation technology, a galvanized layer surface treatment technology, a secondary evaporation technology and a silver plating layer surface treatment technology, so as to form the metallized film. The production technology has the advantages that the surface of the insulation base film is treated by hydrosulphuric acid solution, so that the large-scale oxidizing of metal zinc on the surface of the insulation base film is avoided, the bonding force between a zinc plating layer and the insulation base film is guaranteed, and the self-healing capability of the metallized film is improved; a metal layer on the surface of the insulation base film is of a zinc plating layer, zinc oxide layer, silver plating layer and silver oxide oxide film four-layer structure, so that the erosion rate of the metal layer is effectively reduced, the capacity of a capacitor is not decreased, and the breakthrough accident is avoided; the service life of the metal layer is obviously prolonged.

Description

technical field [0001] The invention relates to a metallized film production process, which belongs to the technical field of capacitors. Background technique [0002] 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 the oxide layer can prevent the metallized film from being oxidized further, when working under high-voltage and high-current AC, the oxide layer will cause the capacity of the capacitor to drop rapidly. 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 betw...

AI Technical Summary

Problems solved by technology

[0002] 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