The Influence of Pulp on the Printability

Abstract

When paper is treated as a communicative function, it does print to the paper and the first time additional value occurs. Then, the paper does have a commercial value in the market. In this paper, required properties of pulp on printing are discussed when irradiating pulp reverse from the view point of the print and looking at it. In the case of printability, there are print runability and print quality. These properties aren’t always compatible, and become the request to be often disagreed with by.
On printing, the shade of the image is resolved into halftone-dots and the image is expressed as the continuous aggregate of dots. The principle is the same even if the different printing method by plate is taken. Therefore, so-called “Dot-reproducibility” is very important to perform better printability, since the print quality is increased by how much a dot is precisely reproduced on the substance in printing. In any printing methods, the smoothness is indispensable for this dot-reproducibility, and pulp is also required to produce good smoothness. In addition to smoothness, surface strength, internal strength, tensile strength, appropriate shrinkage and cutting property (amount of paper powder) are requested on pulp to ensure good printability, e.g. picking, piling, blistering, folding fracture, and print fluting and so on.
Understanding the problems of final printed products becomes an important point when discussing the quality of the pulp as an intermediate-product. It is considered that printability of pulp also becomes one of the big guideposts in studies and developments of pulp in the future.