Capacitor core spray gold protection process

Abstract

The invention discloses a capacitor core metal spraying protection technology. The capacitor core metal spraying protection technology is used for a core group, and includes that aluminum foil glue is glued to a portion of the core group, which needs to be protected, two layers of double side foam tapes are respectively adhered to areas on two end faces of the core group, not sprayed with metal, through the aluminum foil glue for protection, and before metal spraying operation needs to be performed, gasket paper on the outer layers of the double side foam tapes are stripped firstly, and then the metal spraying operation is performed. According to the capacitor core metal spraying protection technology, due to the fact that the double side foam tapes play a part in heat insulation, scalds on the end faces of the core group, caused by high temperature of the melting metal, are completely eradicated in spraying, a white hardening phenomenon in an original technology is completely eradicated, original strong adhesion force between the aluminum foil glue and each end face of a film is reduced, protection structures are convenient and rapid to dismantle, and furthermore due to the fact that two sides of each double side foam tape have viscidity, metal powder is adsorbed to the two sides of each double side foam tape layer by layer, an undesirable phenomenon on a metal spraying face, caused by dropping of blocking metal dust under the circumstance that original protection material is smooth, is avoided, impurity accumulation on a metal spraying device is greatly reduced, a dust removal pipeline is not blocked, and dust removal effects are good.

Description

technical field [0001] The invention relates to a capacitive core protection process used in the gold spraying step of a flattened metallized capacitor. Background technique [0002] In the production process of flattened metallized capacitors, after the metallized film is rolled, flattened, and packaged into a core group, a layer of metal needs to be sprayed on both ends of the core group to lead out the capacitor electrodes, and the remaining surfaces that do not need to be sprayed Need protection. In metal spraying, an arc is used to melt the metal wire at the nozzle of the spray gun, and the compressed air in the nozzle will blow the molten metal into high-temperature metal particles and spray them directly onto the end face of the capacitor. If the protection is not in place, the core that does not need to be sprayed will inevitably be damaged The remaining area of ​​the group is contaminated. The conventional protection process in the capacitor industry is to use alu...

AI Technical Summary

Problems solved by technology

In metal spraying, an arc is used to melt the metal wire at the nozzle of the spray gun, and the compressed air in the nozzle will blow the molten metal into high-temperature metal particles and spray them directly onto the end face of the capacitor. If the protection is not in place, the core that does not need to be sprayed will inevitably be damaged The remaining area of ​​the group is contaminated

The conventional protection process in the capacitor industry is to use aluminum foil adhesive to directly paste the part to be protected, but when spraying, because the aluminum foil is too smooth, the metal dust layer accumulated on the aluminum foil is blown off by the gold spray airflow, which is easy to cause gold spray pipes blockage; and because the aluminum foil is too smooth, the foggy metal ash on the aluminum foil is blown to the gold-sprayed surface by the gold-sprayed airflow, blocking the surface to be sprayed with gold, resulting in a locally thinner gold-sprayed layer, causing rework (reducing welding quality) or even scrapping ; and due to the poor heat insulation of the aluminum foil layer, the adhesive layer is bonded to the end surface of the core at high temperature, so that the aluminum foil and the film surface are firmly bonded after spraying gold, and the aluminum foil is not easy to remove; White hardening caused by burns and glue residue (with certain corrosiveness)

In short, there are problems such as unstable product quality and low production efficiency in the conventional protection process

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