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Magazine articles
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.
Magazine articles
1994 polymers, laminations and coatings conference highlights technology basics, TAPPI JOURNAL, December 1994, Vol. 77(12)
1994 polymers, laminations and coatings conference highlights technology basics, TAPPI JOURNAL, December 1994, Vol. 77(12)
Magazine articles
Extend the life of your hoists, TAPPI JOURNAL, February 1994, Vol. 77(2)
Extend the life of your hoists, TAPPI JOURNAL, February 1994, Vol. 77(2)
Magazine articles
Dealing with localized corrosion of paper machine felt-roll journals, TAPPI JOURNAL, October 1994, Vol. 77(10)
Dealing with localized corrosion of paper machine felt-roll journals, TAPPI JOURNAL, October 1994, Vol. 77(10)
Magazine articles
Chemical recovery conference emphasizes high solids firing and mill system closure, TAPPI JOURNAL, August 1995, Vol. 78(8)
Chemical recovery conference emphasizes high solids firing and mill system closure, TAPPI JOURNAL, August 1995, Vol. 78(8)
Magazine articles
Corrosion studies of stainless steels in peroxide bleach media, TAPPI JOURNAL, December 1995, Vol. 78(12)
Corrosion studies of stainless steels in peroxide bleach media, TAPPI JOURNAL, December 1995, Vol. 78(12)
Magazine articles
New strategies and alliances: key to global arena for the polymers, laminations and Coatings division, TAPPI JOURNAL, December 1995, Vol. 78(12)
New strategies and alliances: key to global arena for the polymers, laminations and Coatings division, TAPPI JOURNAL, December 1995, Vol. 78(12)
Magazine articles
Drying: New lime mud dryer kiln helps James Riverâ??s Pennington, AL, mill meet environmental restrictions, December 1995 Tappi Journal [95Dec37.pdf]
New lime mud dryer kiln helps james river's pennington, al, mill meet environmental restrictions, TAPPI JOURNAL, December 1995, Vol. 78(12)
Magazine articles
Employee commitment, involvement key to future for jack creighton, weyerhaeuser's ceo, TAPPI JOURNAL, September 1997, Vol. 80(9)
Employee commitment, involvement key to future for jack creighton, weyerhaeuser's ceo, TAPPI JOURNAL, September 1997, Vol. 80(9)
Magazine articles
The 11th fundamental research symposium investigates papermaking materials, TAPPI JOURNAL, February 1998, Vol. 81(2)
The 11th fundamental research symposium investigates papermaking materials, TAPPI JOURNAL, February 1998, Vol. 81(2)