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Journal articles
Open Access
Conference review: Recycling sessions at TAPPI PEERS, TAPPI JOURNAL February 2012

Conference review: Recycling sessions at TAPPI PEERS, TAPPI JOURNAL February 2012

Journal articles
Open Access
Consequences of lignin precipitation in the pulp and paper industry, TAPPI JOURNAL, January 2006, Vol. 5(1) (236 KB)

Consequences of lignin precipitation in the pulp and paper industry, TAPPI JOURNAL, January 2006, Vol. 5(1) (236 KB)

Journal articles
Open Access
Coating improves the brightness stability of wood-free coated papers containing high-yield pulp, TAPPI JOURNAL, January 2006, Vol. 5(1) (288 KB)

Coating improves the brightness stability of wood-free coated papers containing high-yield pulp, TAPPI JOURNAL, January 2006, Vol. 5(1) (288 KB)

Journal articles
Open Access
Effects of High Treatment Levels in a Dry-Strength Additive

Effects of High Treatment Levels in a Dry-Strength Additive Program Based on Deposition of Polyelectrolyte Complexes: How Much Glue is Too Much?, TAPPI JOURNAL, June 2006, Vol. 5(6) (209 KB)

Journal articles
Open Access
Visualization of Liquid-Vapor Phase Change Phenomena in Impu

Visualization of Liquid-Vapor Phase Change Phenomena in Impulse Technology, TAPPI JOURNAL, June 2006, Vol. 5(6) (767 KB)

Journal articles
Open Access
Substitution of Hardwood Kraft with Aspen High-Yield Pulp in Lightweight Coated Wood-Free Papers: Part I. Synergy of Basestock Properties, TAPPI JOURNAL, March 2006, Vol. 5(3) (409KB)

Substitution of Hardwood Kraft with Aspen High-Yield Pulp in Lightweight Coated Wood-Free Papers: Part I. Synergy of Basestock Properties, TAPPI JOURNAL, March 2006, Vol. 5(3) (409KB)

Journal articles
Open Access
Development of Predictive Oxygen Delignification Models Usin

Development of Predictive Oxygen Delignification Models Using Kinetic Expressions and Neural Networks, TAPPI JOURNAL, May 2006, Vol. 5(5) (151 KB)

Journal articles
Open Access
Influence of Papermaking System Closure on Paper Properties,

Influence of Papermaking System Closure on Paper Properties, TAPPI JOURNAL, May 2006, Vol. 5(5) (301 KB)

Journal articles
Magazine articles
Open Access
Dielectric spectroscopic studies of biological material evolution and application to paper, TAPPI JOURNAL September 2018

Dielectric spectroscopic studies of biological material evolution and application to paper, TAPPI JOURNAL September 2018

Journal articles
Magazine articles
Open Access
Polyvinyl alcohol as foaming agent in foam formed paper, TAPPI JOURNAL August 2019

ABSTRACT: The use of polyvinyl alcohol (PVOH or PVA) as a foaming agent in foam formed paper was investigated. Polyvinyl alcohol is a linear, nonionic water-soluble polymer. It has hydrophobic and hydrophilic parts that give it a surface-active character. PVOH is mainly characterized by degree of hydrolysis and molar mass. Degree of hydrolysis is given as mol-% hydroxyl groups on the polymer. Molar mass is measured indirectly by measuring the viscosity of a 4% PVOH solution. The results show that the degree of hydrolysis of PVOH had a strong effect on the foamability of PVOH. Foamability decreased strongly when the degree of hydrolysis increased from 88 to 98 mol-%. The effect of molar mass on foamability was weaker. We saw an increase in foam stability and bubble size with increasing molar mass, but we did not see any effect on maximum air content. PVOH dosage needed to reach >70% air content (F) varied from 2 g/l up to 10.5 g/l, and the lowest addition levels of PVOH needed were achieved with a low molar mass PVOH with a low degree of hydrolysis. The best strength properties were achieved when using fully hydrolyzed PVOH as the foaming agent. Strength properties (both in- and out-of-plane) of samples made using PVOH were better than those made using an anionic foaming agent (sodium dodecyl sulfate, SDS). By adding PVOH binder fibers to the pulp, we were able to further enhance the strength properties of paper and board.

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