paper capacitors use special capacitor paper as the medium, aluminum foil or tin foil as the electrode and wound into a cylindrical shape, then connect the lead, and then pass the staining treatment, and it is made of shell packaging or epoxy resin potting. Its structure is shown in the figure.
Paper capacitors have the following characteristics:
①Because of the small dielectric thickness (generally only 6-20μm) and the high tensile strength of the capacitor paper, it can be wound into a large-capacity and small-volume capacitor with a capacitance of 1-20μF.
②Wide capacitance range and high working voltage.
③Poor chemical and thermal stability, easy to age.
④The dielectric loss is large.
⑤The working temperature is generally below 85℃-100’℃.
⑥ It is hygroscopic and needs to be sealed, so it is not suitable for working in high frequency circuits.
⑦Simple process and low production cost.
Paper capacitors can be widely used in DC and low frequency circuits.
