What is capacitor paper?

Capacitor paper is a special insulation material used to make capacitors. It is mainly made of high-purity cellulose fibers. It has excellent electrical properties, mechanical strength and chemical stability, and is widely used in power capacitors, electronic components and other electrical equipment. The main function of capacitor paper is to act as a dielectric, isolating the positive and negative plates of the capacitor and storing electrical energy.

Main characteristics of capacitor paper

‌High purity‌: Capacitor paper needs high purity. And impurities that affect the performance of electrolyte and electrode foil must be strictly controlled, such as various acid ions and conductive metal ions.

‌Uniform paper‌: The paper is uniform. It has uniform thickness and tightness, uniform fiber arrangement, and no impurities.

‌High dielectric properties‌: Capacitor paper has high dielectric properties, which can store more charge and increase the capacity of the capacitor.

‌High temperature resistance‌: Capacitor paper needs to work under high temperature conditions without deformation or damage to ensure the stability and safety of the capacitor.

‌Good insulation performance‌: The insulation resistance of capacitor paper should be high enough to ensure that it has good insulation performance.

Main application areas of capacitor paper

1. Electrolytic capacitor manufacturing

Capacitor paper is one of the three key materials that make up electrolytic capacitors. In electrolytic capacitors, capacitor paper, as an adsorption carrier for electrolyte, forms the cathode of the capacitor with the electrolyte, and also serves to isolate the two-electrode foil. Therefore, the performance of capacitor paper directly affects the quality and performance of electrolytic capacitors. During the manufacturing process, capacitor paper needs to meet the requirements of high purity, high strength, good air permeability and electrolyte absorption performance to ensure the stability and reliability of electrolytic capacitors.

2. Electronic Industry Applications

Communication equipment: In telecommunications, radar, remote control and other radio equipment, capacitor paper is widely used in capacitors to provide stable capacitance and isolation functions. These devices require high-precision capacitors to ensure stable signal transmission and processing, and the high performance and stability of capacitor paper make it an ideal choice.

Electrical equipment: In electrical equipment such as electrical instruments, motors, transformers, etc., capacitor paper also plays an important role. It is used to manufacture various capacitors to meet the equipment’s needs for capacitance and voltage stability. For example, in motors, capacitors made of capacitor paper can be used for starting and running control to improve the efficiency and reliability of the motor.

Power transmission system: In the power transmission system, capacitor paper is used to manufacture high-voltage capacitors to improve the power factor and stability of the power system. These capacitors can reduce energy loss during power transmission and improve the efficiency of the power system.

Market demand and trends of capacitor paper

With the rapid development of the electronics industry and the rise of new energy fields, the market demand for capacitor paper continues to grow. Especially in emerging fields such as 5G communications, electric vehicles, wind power generation and solar power generation, the application prospects of capacitor paper are broad. In order to meet market demand, capacitor paper manufacturers need to continuously carry out technological innovation and product upgrades to improve the electrical performance and reliability of their products. At the same time, it is also necessary to strengthen raw material quality control and production process optimization to reduce production costs and improve production efficiency.