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Lignin functionalization and the alkaline delignification rate, TAPPI JOURNAL, May 1992, Vol. 75(5)

Lignin functionalization and the alkaline delignification rate, TAPPI JOURNAL, May 1992, Vol. 75(5)

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.

TAPPI Journal Summaries, Paper360º July/August 2022

The role of hornification in the deterioration mechanism of physical properties of unrefined eucalyptus fibers during paper recycling, TAPPI Journal February 2024

ABSTRACT: Physical properties of cellulosic paper deteriorate significantly during paper recycling, which hinders the sustainable development of the paper industry. This work investigates the property deterioration mechanism and the role of hornification in the recycling process of unrefined eucalyptus fibers. The results showed that during the recycling process, the hornification gradually deepened, the fiber width gradually decreased, and the physical properties of the paper also gradually decreased. After five cycles of reuse, the relative bonding area decreased by 17.6%, while the relative bonding force decreased by 1.8%. Further results indicated that the physical property deterioration of the paper was closely related to the decrease of fiber bonding area. The fiber bonding area decreased linearly with the reduction of re-swollen fiber width during paper recycling. Re-swollen fiber width was closely related to the hornification. Hornification mainly reduces the bonding area of unrefined eucalyptus fiber rather than the bonding force. The work elucidates the role of hornification in the recycling process of unrefined eucalyptus fibers and the deterioration mechanism of paper physical properties, which will be helpful to control the property deterioration of paper and achieve a longer life cycle.

A Kids' View of 'Forests For Our Future', TAPPI JOURNAL, January 2000, Vol. 83(1)

A Kids' View of 'Forests For Our Future', TAPPI JOURNAL, January 2000, Vol. 83(1)

Calcium in pulping and bleaching, TAPPI JOURNAL, December 2000, Vol. 83(12)

Calcium in pulping and bleaching, TAPPI JOURNAL, December 2000, Vol. 83(12)

Practical Solutions: Preventing corrosion at the base of carbon steel tanks, July 2002 SOLUTIONS! [02JULSO52.pdf]

Preventing corrosion at the base of carbon steel tanks, Solutions!, July 2002, Vol. 85(7) (586KB)

Trends and ideas, Solutions!, Online Exclusives, February 20

Trends and ideas, Solutions!, Online Exclusives, February 2003

CTR improves business performance, Solutions!, Online Exclus

CTR improves business performance, Solutions!, Online Exclusives, February 2003

Application of Yellowing Inhibitors to Mechanical Papers Using a Pilot Liquid Application System, JOURNAL OF PULP AND PAPER SCIENCE: VOL. 28 NO. 5 MAY 2002 [02MAYJP159.pdf]

Application of yellowing inhibitors to mechanical papers using a pilot liquid application system, Journal of Pulp and Paper Science, May 2002, Vol. 28(5) (320KB)