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TAPPI JOURNAL Summaries, Paper360º November/December 2017
TAPPI JOURNAL Summaries, Paper360º November/December 2017
Journal articles
Magazine articles
Effect of conductivity on paper and board machine performanc
Effect of conductivity on paper and board machine performance— a review and new experiences, TAPPI JOURNAL October 2017
Journal articles
Magazine articles
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
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Kingsport Celebrates Its Centennial, Paper360º November/Dec
Kingsport Celebrates Its Centennial, Paper360º November/December 2016
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Best Practices for Wastewater Treatment and Management, Pape
Best Practices for Wastewater Treatment and Management, Paper360º November/December 2016
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Ready to Compete for Another Century, Paper360º September/Oc
Ready to Compete for Another Century, Paper360º September/October 2017
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Drying Optimization at RDM Ovaro, Paper360º September/Octobe
Drying Optimization at RDM Ovaro, Paper360º September/October 2017
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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
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On the nominal transverse shear strai to characterize the severity of creasing, TAPPI JOURNAL April 2018
On the nominal transverse shear strai to characterize the severity of creasing, TAPPI JOURNAL April 2018
Journal articles
Magazine articles
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.