Heat sensitive stencil sheet

摘要

A heat sensitive stencil sheet is provided that can provide a high-quality image, which is sharp and free from white spots and density inconsistencies even at high resolution. The heat sensitive stencil sheet comprises a thermoplastic resin film and an ink-permeable porous substrate, and the substrate has a minimum dispersion index of reflected light of 13 and a maximum total area percentage of high basis-weight areas and low basis-weight areas each having an area not less than 0.5 mm2 of 3%, wherein with respect to a histogram of 64 levels of density of a reflected light image read on an area of (10 cm)2 with a 787-by-787-pixel resolution, the dispersion index is defined as h/(Lx100) wherein h represents a maximum peak frequency and L is (highest level which exceeds 500 frequencies)-(lowest level which exceeds 500 frequencies) +1; the high basis-weight areas are (level representing the maximum peak frequency +5 levels) or more; the low basis-weight areas are (level representing the maximum peak frequency-5 levels) or less; and the total area percentage (%) is {(total area of high basis-weight areas each having an area of not less than 0.5 mm2+ total area of low basis-weight areas each having an area of not less than 0.5 mm2)/(area of read image)}x100.