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Journal articles
Magazine articles
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
CFD-Based Modeling of Kraft Char Beds â?¢ Part 2: A Study on the Effects of Droplet Size and Bed Shape on Bed Processes, TAPPI JOURNAL February 2010

CFD-Based Modeling of Kraft Char Beds • Part 2: A Study on the Effects of Droplet Size and Bed Shape on Bed Processes, TAPPI JOURNAL February 2010

Journal articles
Open Access
Understanding the Role of Surface Active Substances in Flotation Deinking Mills by Coupling Surfactant and Ink Balance With Process Simulation, TAPPI JOURNAL February 2010

Understanding the Role of Surface Active Substances in Flotation Deinking Mills by Coupling Surfactant and Ink Balance With Process Simulation, TAPPI JOURNAL February 2010

Journal articles
Open Access
Superhydrophobic paper coating containing nonconventional clay, TAPPI JOURNAL November 2010

Superhydrophobic paper coating containing nonconventional clay, TAPPI JOURNAL November 2010

Journal articles
Open Access
Z-direction fiber orientation in paperboard, TAPPI JOURNAL October 2010

Z-direction fiber orientation in paperboard, TAPPI JOURNAL October 2010

Journal articles
Open Access
Modeling of Bagginess Due to Storage of Paper Reels With Ridges, TAPPI JOURNAL September 2009

Modeling of Bagginess Due to Storage of Paper Reels With Ridges, TAPPI JOURNAL September 2009

Journal articles
Open Access
Application of Imaging Reflectometry to Studies of Print Mottle on Commercially Printed Coated Papers, TAPPI JOURNAL January 2008

Application of Imaging Reflectometry to Studies of Print Mottle on Commercially Printed Coated Papers, TAPPI JOURNAL January 2008

Journal articles
Open Access
Applications of tension and nip load profile measurement using a novel roll mounted electret film sensor, TAPPI JOURNAL April 2010

Applications of tension and nip load profile measurement using a novel roll mounted electret film sensor, TAPPI JOURNAL April 2010

Journal articles
Open Access
Effects of impregnation time on hardwood kraft pulp characteristics and papermaking potential â?¢ a mill study, TAPPI JOURNAL April 2010

Effects of impregnation time on hardwood kraft pulp characteristics and papermaking potential • a mill study, TAPPI JOURNAL April 2010

Journal articles
Open Access
Starch-modified fillers for linerboard and paper grades: A perspective review, TAPPI JOURNAL April 2010

Starch-modified fillers for linerboard and paper grades: A perspective review, TAPPI JOURNAL April 2010

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