Update on R2R Application of Inkjet of Conductive Inks

Update on R2R Application of Inkjet of Conductive Inks

Stan Farnsworth
NovaCentrix

One of the hopes of printed electronics has been the ability to digitally print highly conductive traces on nonporous substrates such as PET at high speed. Until recently, the best performing digitally, e.g. ink-jet, printed traces generally had to be printed onto an inkjet receptive layer which was coated onto a polymer. This increased the cost of the final product, but the inkjet receptive layer also made the final product fragile and susceptible to solvent. Recently, we have developed a commercially available inkjet-able silver ink that can be printed directly onto nonporous substrates, such as PET. The new ink is being introduced simultaneously with a pilot level R2R machine with print and cure capabilities including in-line Photonic Curing. Typical sheet resistance is 20 milliohm/sq with excellent adhesion and solvent resistance making it adequate for HF RFID as well as as for power conduction in inexpensive, flexible circuit boards.