WEE Technology Company Limited - WEE are Capacitors Specialist

Plastic film capacitors are widely used in analog signal interleaving, power noise bypass (anti cross connection) and so on. Plastic film capacitor is a kind of capacitor with metal foil as electrode, which is overlapped with plastic film such as polyethylene glycol, polypropylene, polyethylene or polycarbonate from both ends and wound into a cylindrical structure. According to the type of plastic film, they are called poly (ethylene oxide) (Mylar), polypropylene (PP), polystyrene (PS) and polycarbonate.

Plastic film capacitor is a kind of excellent capacitor because of its many excellent characteristics. Its main properties are as follows: non polarity, high insulation impedance, excellent frequency characteristics (wide frequency response), and small dielectric loss. Based on the above advantages, plastic film capacitors are widely used in analog circuits. Especially in the part of signal cross connection, capacitors with good frequency characteristics and very low dielectric loss must be used to ensure that the signal will not be greatly distorted during transmission. Among all the plastic film capacitors, polypropylene (PP) capacitor and polystyrene (PS) capacitor have the most obvious characteristics. Of course, the prices of these two kinds of capacitors are also relatively high. However, in recent years, in order to improve the sound quality of audio equipment, the parts materials used have become more and more advanced, and the price is not the most important factor to be considered. Therefore, in recent years, the frequency and quantity of PP and PS capacitors used in audio equipment are increasing.

The common method of making plastic film capacitor is to take aluminum and other metal foil as the electrode and roll it together after overlapping with plastic film. But in addition, there is another way to make thin film capacitors, called metallized film. The method is to vacuum coat a thin layer of metal on a plastic film to act as an electrode. In this way, the thickness of the electrode foil can be omitted, and the volume per unit capacity of the capacitor can be reduced. Therefore, the thin film capacitor can be easily made into a small and large capacity capacitor. For example, the common MKP capacitor is the synonym of metallized polypropylene film capacitor, and MKT is the synonym of metallized polyethylene film capacitor.