Screen E-Book (.PDF) - MacDermid Autotype

Solving problemsThis screen-shot from the Line Edge Demonstratorfrom the DSP shows a high EOMand high Rz leading to positive sawtoothing,thick edges and increased line-widthfrom slump!A low Rz automatically gives you low positivesawtoothing.The sawtoothing gives large variations ofresistivity for a printed conducting track.We found this during our Print QuantificationProject as shown in the diagramwhere the print from a 1+1 emulsion (low-EOM, high-Rz) is compared to a low-EOM,low-Rz capillary film. Note that superficiallythe variations are the same as those foundfor the high-EOM, low-Rz stencil discussedunder Thick Edges above. In fact the rootcause is totally different! Had we not carefullycompared the 3 cases (low-EOM +high-Rz; high-EOM + low-Rz; low-EOM +low-Rz) we would not have been able todisentangle the different effects.Where positive sawtoothing comes fromThe high-Rz, low-EOM emulsion stencil (top) gives large variationsin resistance over the 81 variants of squeegee pressure/angle/orientation compared to the low-Rz, low-EOM capillaryfilm (below).82