Ink jet (IJ) printing has long been talked about as a technique for manufacturing printed circuit boards (PCBs) in a fast and efficient way. This technology has now advanced to a point where legend printing, primary track imaging and soldermask application can now be achieved commercially. This paper describes advances in technology to enable application of the materials needed for primary track imaging and soldermask printing at the required resolution.
Mark James, "Manufacturing Printed Circuit Boards Using Ink Jet Technology" in Proc. IS&T Int'l Conf. on Digital Printing Technologies (NIP19), 2003, pp 651 - 655, https://doi.org/10.2352/ISSN.2169-4451.2003.19.1.art00049_2