CBB polypropylene film capacitor is widely used in high-frequency filtering, snubber and resonant circuits. Capacitance stability directly affects the filtering effect and circuit resonance point. Professional manufacturers control the capacitance deviation from raw material selection, winding process, heat setting and finished product sorting, so as to keep the tolerance within J (±5%) or K (±10%) range stably.

CBB capacitor winding process control: Adopt fully automatic winding machine with closed-loop tension control to avoid uneven film tension and inconsistent effective overlapping area. The winding alignment accuracy is strictly controlled, and the initial capacitance target value is corrected in advance according to the capacitance loss rate of hot pressing and heat treatment, to offset the capacitance drift in subsequent processes.

CBB capacitor capacitance screening method: After hot pressing and curing, use high-precision LCR meter for full inspection and bin sorting. The products with excessive deviation are eliminated. Regularly compare the capacitance data of the same batch in different temperature environments to evaluate the temperature drift and ensure stable capacitance under variable temperature working conditions.

weidy CBB capacitor reminds that raw material consistency is also critical. Stable source of polypropylene film and uniform metallization thickness can reduce the fluctuation of capacitance. Regular IPQC spot check is carried out in mass production to adjust process parameters in time once the capacitance deviation trend is found.