In brief
Visual print quality does not establish heater or sensor performance. Electrical design, power conditions and service environment belong in the sample specification.
Specify voltage, target resistance, power distribution, heat-up time and hot-spot limits for a heater
Specify voltage, target resistance, power distribution, heat-up time and hot-spot limits for a heater. For a sensor, define input range, response curve, drift and repeatability. Henkel lists printed heaters, membrane switches and resistive sensors as printed-electronics uses, each with different acceptance criteria.
Trace width, dry deposit and cure affect resistance
Trace width, dry deposit and cure affect resistance. A local open or thin region can create abnormal current distribution and hot spots. Fix the artwork, resistance probes and thermal imaging positions across trials.
Measure resistance after the intended bend radius and cycle count, then after humidity and temperature cycling
Measure resistance after the intended bend radius and cycle count, then after humidity and temperature cycling. Retest after lamination or encapsulation. Initial data from an unassembled film cannot establish long-term device function.
Provide film, ink data sheet, circuit drawing, target resistance and acceptable defect rate
Provide film, ink data sheet, circuit drawing, target resistance and acceptable defect rate. Qualify the LICHAO printing route against electrical and reliability results on real samples.
How do we start a trial?
Provide substrate, controlled artwork, material data, process flow and acceptance criteria. Use representative samples to confirm configuration and process window.
References and fact sources
Original process guidance. Verify equipment fit and performance with customer samples.
Mr. Yang can discuss a trial plan from your film, drawing and acceptance requirements.
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