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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
OCC pulp fractionation-a comparative study of fractionated and unfractionated stock, TAPPI JOURNAL, Online Exclusive, January 2004, Vol. 3(1) (KB)

OCC pulp fractionation-a comparative study of fractionated and unfractionated stock, TAPPI JOURNAL, Online Exclusive, January 2004, Vol. 3(1) (KB)

Journal articles
Open Access
A mathematical method for determining fiber wall thickness and fiber width , Solutions! & TAPPI JOURNAL, February 2004, Vol. 3(2) (117KB)

A mathematical method for determining fiber wall thickness and fiber width , Solutions! & TAPPI JOURNAL, February 2004, Vol. 3(2) (117KB)

Journal articles
Open Access
The use of ozone as a biocide in paper machine recycled white water, TAPPI JOURNAL, May 2000, Vol. 83(5)

The use of ozone as a biocide in paper machine recycled white water, TAPPI JOURNAL, May 2000, Vol. 83(5)

Journal articles
Open Access
Shear factor : a new way to characterize fiber suspension shear, TAPPI JOURNAL, August 2001, Vol. 84(8)

Shear factor : a new way to characterize fiber suspension shear, TAPPI JOURNAL, August 2001, Vol. 84(8)

Journal articles
Open Access
Gmundâ??s special place in the heart of Europe, TAPPI JOURNAL, August 2001, Vol. 84(8)

Gmund’s special place in the heart of Europe, TAPPI JOURNAL, August 2001, Vol. 84(8)

Journal articles
Open Access
Forests for our future: what an experience!, TAPPI JOURNAL, August 2001, Vol. 84(8)

Forests for our future: what an experience!, TAPPI JOURNAL, August 2001, Vol. 84(8)

Journal articles
Open Access
E-commerce: panacea or placebo?, TAPPI JOURNAL, July 2001, Vol. 84(7)

E-commerce: panacea or placebo?, TAPPI JOURNAL, July 2001, Vol. 84(7)

Journal articles
Open Access
Investing in the future of your mill, TAPPI JOURNAL, July 2000, Vol. 83(7)

Investing in the future of your mill, TAPPI JOURNAL, July 2000, Vol. 83(7)

Journal articles
Open Access
Stracel: A modern european mill in France, TAPPI JOURNAL, June 1997, Vol. 80(6)

Stracel: a modern european mill in france, TAPPI JOURNAL, June 1997, Vol. 80(6)

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