Processing for manufacturing metallized polypropylene film capacitor

Abstract

The invention discloses a process for manufacturing a metallized polypropylene film capacitor, which comprises the steps of slug manufacturing, slug shaping, slug membrane enveloping and metal spraying, energizing, soaking and internal sealing, slug assembling and finished product testing, wherein in the step of the slug membrane enveloping and metal spraying, a dust removing plant is used to absorb floating dust metal particles so that metal spraying particles effectively contact with the end face of a staggered edge of the capacitor, the contact performance is reliable, the resistance is small, and particularly at a high frequency, the metal loss is far smaller and the charging current and the withstand voltage of the capacitor are improved; and in the step of the soaking and internal sealing, the vacuum degree is required to be reduced to be below -0.1 MPa to perform the soaking, the reliability of edge arcing is improved and the withstand voltage is also improved. The metallized polypropylene film capacitor produced by the manufacturing process has the advantages of small volume, high-voltage resistance and good dielectric property, the compression strength is improved to two times, the loss is 10 KHZ, the dielectric loss angle tangent is 0.001, and the temperature shock resistance is between 40 and 100 DEG C.

Description

technical field [0001] The invention relates to a manufacturing process of a capacitor in the field of electronic components, in particular to a manufacturing process of a metallized polypropylene film capacitor. Background technique [0002] Such as figure 1 As shown, the capacitor cores of existing metallized polypropylene film capacitors are mostly composed of two layers of single-edge evaporated polypropylene film 1 and one layer of polypropylene film 2, which are superimposed and wound, and then encapsulated with a flame-retardant material. It has the characteristics of excellent electrical performance, good reliability, low loss and good self-healing performance, and is suitable for high-frequency circuits. It is widely used in instruments, meters, TVs, radios and household appliances for DC pulsation, pulse and AC step-down effect, especially suitable for energy-saving lamps and electronic rectifiers. However, in the traditional production process of metallized poly...

AI Technical Summary

Problems solved by technology

However, in the traditional production process of metallized polypropylene film capacitors, it is difficult to remove dust due to the weight and strong adhesion of the metal powder in the gold spraying process. Especially in the vacuum impregnation process, the vacuum degree is controlled at about -0.008MPa. The reliability of edge flashover is low, and the withstand voltage is also low, resulting in a large capacitor, which discharges the gas in the gap between the two ends of the electrode. When charging and discharging at high voltage, sparks are generated to break down the medium, thereby causing the capacitor to fail.

Images