Printer Friendly

Paper structure and printability as controlled by the fibrous elements.

APPLICATION: Sheet properties are sensitive to the precise level of fiber character and sheet fines content. By manipulating the fiber and fines fractions, papermakers can improve sheet properties.

The surface structure and printability of radiata pine TMP sheets are sensitive to the character and content of their fractions of long fiber and fines. Sheets made from the fibers of juvenile wood are less porous and have smoother surfaces than sheets made from the fibers of mature wood. Therefore, the thin-walled fibers of juvenile wood generally produce sheets with better optical and printing properties.

In these experiments, the researchers tested the interrelated impacts that fiber size, fiber quality, and the quality, quantity, and type of fines have on the structure and print performance of sheets equivalent to newsprint. Most of their experiments were carried out on laboratory sheets formed from different pulps with freenesses of 100 mL CSF pulps. They determined the effects of the fines fraction by examining the relative influence of the primary and the secondary fines and by adding different quantities of fines to produce the required freeness.

They found that ink demand is more sensitive to fiber size and quality than to the pulp fines content, with the ink demand being lower for sheets characterized by juvenile wood. Increased quantities of fines increase the sheet density and decrease sheet porosity and roughness, reducing ink demand and improving print performance. By manipulating the quality and quantity of the fiber and fines fractions, papermakers can improve the performance of paper in printing. View this paper online at

Stuart R. Corson, Dexter G. Morgan, and John D. Richardson are with PAPRO, Forest Research, Rotorua, New Zealand. Anthony G. Flowers is with Norske Skog Paper Mills (Australia) Ltd, Boyer, Australia. You may contact Corson via phone at +64 7 34 35 472, or by email at
COPYRIGHT 2004 Paper Industry Management Association
No portion of this article can be reproduced without the express written permission from the copyright holder.
Copyright 2004, Gale Group. All rights reserved. Gale Group is a Thomson Corporation Company.

Article Details
Printer friendly Cite/link Email Feedback
Title Annotation:Fibers and Fines
Author:Flowers, Anthony G.
Publication:Solutions - for People, Processes and Paper
Date:Jun 1, 2004
Previous Article:Crystallization and control of sodium salt scales in black liquor concentrators.
Next Article:Viscoelastic properties of the polymer binder affecting the processability, structure and properties of dry surface treated papers.

Related Articles
Minerals help magazines: deliver strong advertiser returns.
Corporate and product information.
Trends in papermaking: ideas from the experts.
Press fabric selection & performance improvement.
Summaries of December 2004 peer-reviewed papers.
How Paper is Made: An Overview of Pulping and Papermaking from Woodyard to Finished Product, Second Edition.
Properties of Fibrous Raw Materials and Their Preparation for Pulping.
Environmental: in-situ reduction of fibrous sludge in a pulp mill aerated stabilization basin.
What you need to know about starch in papermaking.

Terms of use | Privacy policy | Copyright © 2018 Farlex, Inc. | Feedback | For webmasters