Due to the fact that most of the conductive plastics currently used are composite structures, the conductive plastic resistance film that the project team is going to discuss is an APT resin plastic filled with conductive graphite. Therefore, only the primary factors affecting the conductive function of composite conductive plastics will be explained here. The effect of different types of fillers on the volume resistivity of polycarbonate is shown in Figure 1. From the figure, it can be seen that with the addition of filler content, the volume resistivity of the data decreases, and the conductivity is added. Moreover, for different types of conductive fillers, when the content reaches a certain critical value, the decrease in volume resistivity of the data slows down. Therefore, conductive fillers have an upper limit, and more is not better.

The production process of conductive plastic displacement sensors includes two aspects: the production process of sensitive resistors, brush components, shells, and other components, as well as the overall detection process of the sensors. The manufacturing process parameters have a significant impact on the functionality of sensors, therefore, selecting a reasonable process is one of the key factors to ensure the quality of sensors. The sensitive resistance of a sensor is its structural center, and there are currently two main production processes: spraying and printing. Spray painting is the primary method used domestically, while printing is the main method used abroad. The former has higher requirements for post production repair, lower product qualification rate, and also has a certain impact on the environment, making it suitable for manual production with lower costs; The latter can achieve high initial resistance accuracy, easy post-processing, and high degree of automation, but requires significant equipment investment, making it suitable for large-scale production. The manufacturing process of the remaining components has no special features, just like most precision machining, it requires high processing accuracy and high electrical insulation function requirements. As for the entire testing process, the primary basis is to confirm the corresponding testing process regulations based on the different requirements for the application functions of sensors, in order to ensure the reliable and common quality of sensors.

Article source: Taishan conductive masterbatch

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