In brief
Each printed circuit layer serves a different role: conduction, contact, crossover insulation or protection. Work backward from resistance, flexing and the available thermal budget.
Silver inks can form low-resistance traces, but width, dry film thickness, cure and flexing affect line resistance
Silver inks can form low-resistance traces, but width, dry film thickness, cure and flexing affect line resistance. Henkel lists several screen-printable silver inks for PET and PI with different cure conditions and sheet resistance. One grade cannot be treated as interchangeable with another.
Carbon inks can serve contact or sensing areas and may protect selected silver tracks; dielectric layers can isolate crossing conductors
Carbon inks can serve contact or sensing areas and may protect selected silver tracks; dielectric layers can isolate crossing conductors. The functional design and ink compatibility trials must determine the stack. Not every material can be overprinted on every other one.
Set a registration reference, drying condition and inspection point for each layer
Set a registration reference, drying condition and inspection point for each layer. Repeated heating can move film dimensions. Either sheet or web printing may contribute, but target line spacing and yield must be demonstrated rather than inferred from rated machine accuracy.
Beyond opens and shorts, log line, sheet and contact resistance before and after bending
Beyond opens and shorts, log line, sheet and contact resistance before and after bending. Test interlayer insulation against the customer's voltage and environment. Use production-intent material lots and artwork in equipment trials.
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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