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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

TAPPI JOURNAL Summaries, Paper360º November/December 2017

TAPPI JOURNAL Summaries, Paper360º November/December 2017

Three-dimensional pore structure visualization and character

Three-dimensional pore structure visualization and characterization of paper using X-ray computed tomography, TAPPI JOURNAL September 2017

Ready to Compete for Another Century, Paper360º September/Oc

Ready to Compete for Another Century, Paper360º September/October 2017

Drying Optimization at RDM Ovaro, Paper360º September/Octobe

Drying Optimization at RDM Ovaro, Paper360º September/October 2017

Making Good Bacteria Even Better: Bioaugmentation in Pulp a

Making Good Bacteria Even Better: Bioaugmentation in Pulp and Paper Wastewater Treatment, Paper360º September/October 2017

Reliable Wet End Control in the Production Process, Paper360º September/October 2022

Fixing Just One Link Doesn’t Strengthen a Chain, Paper360º September/October 2022