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Wood Market Dynamics and the Impact on Pulp and Paper: Current Trends, November/December 2023 Paper360º

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.

ABB’s New R&D Center: Perfect Location for the Transformation of the Pulp and Paper Industry, Paper360º September/October 2023

Ink-jet dye fixation and coating pigments, TAPPI JOURNAL, August 1999, Vol. 82(8)

Ink-jet dye fixation and coating pigments, TAPPI JOURNAL, August 1999, Vol. 82(8)

Modeling paper strain in a calender nip, TAPPI JOURNAL, August 1999, Vol. 82(8)

Modeling paper strain in a calender nip, TAPPI JOURNAL, August 1999, Vol. 82(8)

1998 tappi salary survey, TAPPI JOURNAL, August 1999, Vol. 82(8)

1998 tappi salary survey, TAPPI JOURNAL, August 1999, Vol. 82(8)

New rail car helps better protect pulp during shipping, TAPPI JOURNAL, December 1999, Vol. 82(12)

New rail car helps better protect pulp during shipping, TAPPI JOURNAL, December 1999, Vol. 82(12)

Shop talk: laboratory test methods help diagnose printability problems, part II, TAPPI JOURNAL, December 1999, Vol. 82(12)

Shop talk: laboratory test methods help diagnose printability problems, part II, TAPPI JOURNAL, December 1999, Vol. 82(12)

International paper strengthens its eastern european base at kwidzyn, TAPPI JOURNAL, February 1999, Vol. 82(2)

International paper strengthens its eastern european base at kwidzyn, TAPPI JOURNAL, February 1999, Vol. 82(2)

An ever-improved swiecie mill, TAPPI JOURNAL, February 1999, Vol. 82(2)

An ever-improved swiecie mill, TAPPI JOURNAL, February 1999, Vol. 82(2)