Process and characteristics of metal film capacitors

Generally, a metal film capacitor is formed by winding a metal foil as an electrode and a plastic film, and there is another manufacturing method in which a thin layer of metal is vacuum-deposited on the plastic film. As an electrode, the advantage of this is that the thickness of the electrode foil can be eliminated, the volume per unit capacity of the capacitor can be reduced, and the capacity is larger.

A metal film capacitor is a metallized film capacitor in which a double-sided metallized polypropylene film and a non-metallized polypropylene film are wound up or laminated. Metal film capacitors are excellent capacitors because of their excellent characteristics. It mainly has non-polarity, high insulation resistance, excellent frequency characteristics, small dielectric loss, good heat resistance, rated working temperature of 70 ° C, high working temperature up to 155 ° C, good voltage stability, small temperature coefficient, and very application. Widely used, it is widely used in AC, DC and pulse circuits.

In particular, in the part where the signal is connected, it is necessary to use a capacitor having a good frequency characteristic and a very low dielectric loss to ensure that the signal is transmitted without excessive distortion. Among all the plastic film capacitors, the characteristics of the polypropylene capacitor are remarkable.

The metal film capacitor is non-inductive. It is made of polyester film as the medium and aluminum foil for the electrode. The tin-plated copper-clad steel wire has epoxy resin encapsulation. It has: 1. High stability and reliability; 2 , no inductive structure to reduce the loss factor; 3, excellent environmental performance; 4, low ESR; can work at rated temperature: -40 ° C ~ +85 ° C; rated voltage: 100V, 250V, 400V, 630V; Capacity range: 0.001uF ~ 0.47uF, suitable for industrial equipment requiring small signal circuits for noise reduction.