I need at least an overnight to measure the resistance of a PTC ink after curing it. I am looking for a faster way to have the resistance value.
Try a mild exposure to an (dimmable) infrared lamp, 100 W from around 30 - 35 cm above. During illumination, measure impedance from minute to minute for the first 5 minutes, then from 3 minutes to 3 minutes to see when you reach the stabilization part (less than 5 % variation in impedance).
Thanks Gabriel for the answer but from experience it takes more long time to get the right final value of resistance when I put it under UV light. Can you explain more or refer me to an article where I can find more info about that.
As understood from your message, you need some time AFTER UV curing to be able to obtain a stable value of resistance. That might be due to some solvent / liquid carrier still remaining inside the deposited material and evaporating slowly overnight. The mild exposure to infrared radiation will accelerate that evaporation process leading you faster to the stabilised material. The infrared illumination must be mild in order to avoid melting or other modifications produced by high temperature.
However, it depends on the PTC material and recipe you are using. Normally, you should not exceed 100 Celsius degrees. You may accelerate also by putting your device in an oven, again at temperatures not more than 100 Celsius degrees. For example, for some electrically conductive coatings based on graphenic carbon particles (see United States Patent 10294375), the wet films are flashed at room temperature for 15 minutes, followed by an oven cure at 100° C. for 30 minutes.
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