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