STUDIES OF INK-PAPER RELATIONSHIPS FOR INDIAN PRINTING PAPERS

Abstract

Most of *the paper produced is printed. Besides wiriting and printing papers, newsprints, packaging papers and boards are printed by one means or the other. Therefore the paper maker should. know about the behaviour of paper under various printing conditions. Inspite of the extensive research work carried out in this area, the relationships between physical properties of paper as tested in a laboratory and its performance in a printing press are not very well established. Printability evaluation of papers, thus, generally involve actual printing of the paper. Ink-paper relationships involving ink transfer characteristics, print density and show through are critical. aspects in the evaluation of printability. Many authors have discussed various ink transfer parameters to study the printability of papers. The present work was intended to study these parameters in order to evaluate ink transfer, print density and show through for various grades of papers under a set of printing conditions. Chapter 1- of this thesis deals with the introduction to the present work and available literature in this area. Chapter 2 deals with a brief description of various instruments and grades of papers used in the experimental work and the procedure for printing .experiments. Eight grades of papers including three types of newsprints, two types of writing papers, MG •White, Creamwove and Duplicating paper were examined in the present work. The results arEdiscussed in Chapter 3 under three separate titles, namely, Ink transfer, Print density and Show through. Under each title, the effect of various ink transfer parameters is discussed. The conclusions drawn from these discussions are given in Chapter 4; Recomm6ndations" for future work are also given in this chapter. The experimental data have been tabulated in Appendix - I.