Effect of rheological parameters of conductor pastes on thick film fine line screen printing

Various paste-printing benchmarks were performed to investigate the effects of rheological behavior on thick film fine line printing. DuPont 951 AT LTCC green tape and 6142D conductor paste were chosen to be the common evaluation platform. The rheological parameters, such as viscosity, thixotropy, yield stress and ratio of viscous property/elastic property, of each paste sample were changed by increasing solid content of the 6142D paste. The screen printing conditions of each benchmark were kept the same except for the paste samples. The experimental results show that pastes with higher viscosity, yield stress and lower ratio of viscous property/elastic will get fine line patterns with well shape and size definition.