Abstract

Paper is a thin sheet made up of intermeshed cellulose fibres adhered together with physical H-H
bonding. The morphological properties of paper like the shape, size and particle distribution of the
coating pigments results into discrete paper finishes and helps in obtaining the desired print quality
results. One approach to measure the capability of paper and press is to measure the colour gamut of
paper. Objective of this paper is to correlate the substrate surface characteristics of varieties of
cellulosic substrates with the colour gamut of various dry toner based digital printing presses and
finally suggesting the ways to optimize it. In the present research work, a master test chart was
prepared with the help of texts, solids and line images along with 234 number of colour gamut
patches. The chart was printed with the help of six prominently used calibrated dry toner based digital
printing machines on rough uncoated, finished uncoated, matte coated and gloss coated papers. Fiery
Colour Profiler Suite was used as software tool to create the colour measurement patches and
producing colour gamut by scanning the patches with the help of i1iO version 2 instrument. The
results indicated that surface characteristics of paper are highly responsible for deciding the colour
gamut. Further, with the help of discussions, the surface properties of the paper were correlated with
the colour gamut of dry toner digital printing presses to optimize it.

Keywords:- Electro-photographic Printing, Dry Toner, Colour Gamut, Uncoated Paper, Gloss Coated
Paper, Matte Coated Paper, Surface Properties