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Kraft pulp viscosity as a predictor of paper strength: Its uses and abuses, TAPPI Journal October 2023

ABSTRACT: For bleached kraft pulps, two factors govern paper strength: the individual fiber strength, and the bond strength that adheres the individual fibers together in the paper matrix. Inherent fiber strength is related to the length of the carbohydrate polymers, also known as the degree of polymerization (DP). Average DP (DP) is inferred by performing pulp viscosity measurements. Under certain circumstances during kraft pulping and bleaching, the average polymer lengths can be shortened, resulting in lower pulp viscosity, and may indicate fiber damage. Fiber damage typically manifests itself as a reduction in tear strength for well-bonded handsheets.This paper will review the literature on how pulp viscosity can predict paper/fiber strength and how it can be used as a diagnostic tool. It can be a means to monitor pulp quality during pulping and bleaching, as well as to alert when such operations approach a critical threshold. However, viscosity losses must be carefully and judiciously analyzed. Like most diagnostic tools, viscosity measurements can be misused and abused, which can lead to incorrect inferences about intrinsic fiber strength. This review will also cover these misuses. The overall goal is to provide the papermaker a better understanding of what pulp viscosity is, how it correlates to potential sheet strength, and what its limitations are. It will be illustrated that when pulp viscosity drops below a critical value, it will indicate an appreciable deterioration in the paper’s tear and tensile strength.

Hardwood pulping kinetics of bulk and residual phases, TAPPI JOURNAL October 2015

Hardwood pulping kinetics of bulk and residual phases, TAPPI JOURNAL October 2015

Ultrastructural Behavior of Cell Wall Polysaxxharides, TAPPI Journal April 2022

ABSTRACT: Considerable information on the ultrastructural organization of the plant cell wall and the supermolecular arragement of the cell wall components, in particular of cellulose, has been obtained with the electron microscope.

World’s Largest MVR Evaporation Plant for Sulphite Spent Liquor at Sappi Saiccor Pulp Mill, Paper360º July/August 2022

TAPPI Journal Summaries, Paper360º July/August 2022

TAPPI Journal Summaries, Paper360º July/August 2022

Kingsport Celebrates Its Centennial, Paper360º November/Dec

Kingsport Celebrates Its Centennial, Paper360º November/December 2016

Cavitation-jet deinking: A new technology for deinking of recovered paper, TAPPI JOURNAL September 2014

Cavitation-jet deinking: A new technology for deinking of recovered paper, TAPPI JOURNAL September 2014

Systematic screening of biorefinery technologies at the early stage of design, TAPPI JOURNAL October 2012

Systematic screening of biorefinery technologies at the early stage of design, TAPPI JOURNAL October 2012

Semi-bleached paper and fermentation products from a larch biorefinery, TAPPI JOURNAL October 2012

Semi-bleached paper and fermentation products from a larch biorefinery, TAPPI JOURNAL October 2012

Chemical, anatomical, and technology aspects of Eucalyptus benthamii and Eucalyptus dunii for use in an integrated pulp and paper mill 15-Feb-73

Chemical, anatomical, and technology aspects of Eucalyptus benthamii and Eucalyptus dunii for use in an integrated pulp and paper mill, TAPPI JOURNAL February 2015