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Open Access
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.

Journal articles
Open Access
Electrochemical Removal of Color and Toxicity from Bleached

Electrochemical Removal of Color and Toxicity from Bleached Kraft Effluents, 1994 Environmental Conference Proceedings

Journal articles
Open Access
Improving energy efficiency of existing recovery boilers 15FEB105

Improving energy efficiency of existing recovery boilers, TAPPI JOURNAL February 2015

Journal articles
Open Access
Design of refractory linings for balanced energy efficiency, uptime, and capacity in lime kilns 15FEB141

Design of refractory linings for balanced energy efficiency, uptime, and capacity in lime kilns. TAPPI JOURNAL February 2015

Journal articles
Open Access
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

Journal articles
Open Access
Optimization of a brownstock washing line 15-Feb-83

Optimization of a brownstock washing line, TAPPI JOURNAL February 2015

Journal articles
Open Access
Impact of wood chip leaching pretreatment on wood chemical composition 15-Jan-09

Impact of wood chip leaching pretreatment on wood chemical composition, TAPPI JOURNAL January 2015

Journal articles
Open Access
Recovery boiler sootblowers: History and technological advances 15-Jan-51

Recovery boiler sootblowers: History and technological advances, TAPPI JOURNAL January 2015

Journal articles
Open Access
New challenges regarding nonprocess elements in the liquor and lime cycle, TAPPI JOURNAL July 2015

New challenges regarding nonprocess elements in the liquor and lime cycle, TAPPI JOURNAL July 2015

Journal articles
Open Access
Upgrading aeration system performance in secondary basins treating pulp and paper wastewater: A review, TAPPI JOURNAL June 2015

Upgrading aeration system performance in secondary basins treating pulp and paper wastewater: A review, TAPPI JOURNAL June 2015

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