Production process for low-noise metallic film capacitor

Abstract

The invention discloses a production process for a low-noise metallic film capacitor, which comprises the following process steps of: coiling: coiling a metallic film by sleeving the metallic film on a shaft, and taking out the shaft after coiling to form a capacitor core with a hole in the middle; prepressing: placing the capacitor core which is coiled in the process step of coiling between two flat plates, and prepressing by vertically applying pressure on the flat plate placed at the upper side; and hot-pressing: placing multiple capacitor cores on a lower pressure plate of a hot-pressing device once, and arranging multiple floating press blocks on the bottom part of an upper pressure plate side by side, wherein each floating press block is aligned with and only presses one capacitor core to float, a thermal silica gel block is arranged between the floating press blocks and the upper pressure plate, and during work, the upper pressure plate drives the floating press blocks to press down to realize hot-pressing. A product produced by the production process has good consistency, and compared with a traditional product on market, the working noise is greatly reduced when the product is used, so the product can meet rigorous electronic product requirements and has a good result of use and good product polymerization, and the voltage-withstanding capacity of the product at work is also greatly improved.

Description

technical field [0001] The invention relates to a production process of a capacitor, in particular to a production process of a low-noise metallized film capacitor. Background technique [0002] Ordinary metallized film capacitors are made of metal films wound together according to different capacity requirements to form a round core (such as figure 1 ), and then polymerized together by hot pressing to make. There is a pre-pressing process before hot pressing to prevent the core from rolling during hot pressing. The traditional process is the pre-pressing method of roller rolling, such as figure 2 As shown, the cores will squeeze each other during preloading, which will easily cause the inner hole of the core to wrinkle. The traditional way of hot pressing is to place a lot of cores on the lower platen at one time, such as image 3 As shown, due to the inevitable error in the thickness of each core, the thicker product can be compacted directly, but the thinner product c...

AI Technical Summary

Problems solved by technology

There is a pre-pressing process before hot pressing to prevent the core from rolling during hot pressing. The traditional process is the pre-pressing method of roller rolling, such as figure 2 As shown, the cores will squeeze each other during preloading, which will easily cause the inner hole of the core to wrinkle

The traditional way of hot pressing is to place a lot of cores on the lower platen at one time, such as image 3 As shown, due to the inevitable error in the thickness of each core, the thicker product can be compacted directly, but the thinner product cannot be compacted.

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