Increased dryness after pressing and wet web strength by utilizing foam application technology

Karita Kinnunen-Raudaskoski, Kristian Salminen, Jani Lehmonen, Tuomo Hjelt

Research output: Contribution to journalArticleScientificpeer-review

1 Citation (Scopus)

Abstract

Production cost savings by lowering basis weight has been a trend in papermaking. The strategy has been to decrease the amount of softwood kraft pulp and increase use of fillers and recycled fibers. These changes have a tendency to lower strength properties of both the wet and dry web. To compensate for the strength loss in the paper, a greater quantity of strength additives is often required, either dosed at the wet end or applied to the wet web by spray. In this pilot-scale study, it was shown how strength additives can be effectively applied with foambased application technology. The technology can simultaneously increase dryness after wet pressing and enhance dry and wet web strength properties. Foam application of polyvinyl alcohol (PVA), ethylene vinyl alcohol (EVOH), carboxymethyl cellulose (CMC), guar gum, starch, and cellulose microfibrils (CMF) increased web dryness after wet pressing up to 5.2%-units compared to the reference sample. The enhanced dewatering with starch, guar gum, and CMF was detected with a bulk increase. Additionally, a significant increase in z-directional tensile strength of dry web and and in-plane tensile strength properties of wet web was obtained. Based on the results, foam application technology can be a very useful technology for several applications in the paper industry.
Original languageEnglish
Pages (from-to)731-738
JournalTappi Journal
Volume15
Issue number11
Publication statusPublished - 2016
MoE publication typeA1 Journal article-refereed

Fingerprint

guar gum
Foams
Cellulose
Starch
Tensile strength
Carboxymethylcellulose Sodium
Papermaking
Kraft pulp
Softwoods
Polyvinyl alcohols
Dewatering
Fillers
Ethylene
Alcohols
Fibers
Costs
Industry

Cite this

@article{2ad4af1c2a4a4eb2b31c0535f6917744,
title = "Increased dryness after pressing and wet web strength by utilizing foam application technology",
abstract = "Production cost savings by lowering basis weight has been a trend in papermaking. The strategy has been to decrease the amount of softwood kraft pulp and increase use of fillers and recycled fibers. These changes have a tendency to lower strength properties of both the wet and dry web. To compensate for the strength loss in the paper, a greater quantity of strength additives is often required, either dosed at the wet end or applied to the wet web by spray. In this pilot-scale study, it was shown how strength additives can be effectively applied with foambased application technology. The technology can simultaneously increase dryness after wet pressing and enhance dry and wet web strength properties. Foam application of polyvinyl alcohol (PVA), ethylene vinyl alcohol (EVOH), carboxymethyl cellulose (CMC), guar gum, starch, and cellulose microfibrils (CMF) increased web dryness after wet pressing up to 5.2{\%}-units compared to the reference sample. The enhanced dewatering with starch, guar gum, and CMF was detected with a bulk increase. Additionally, a significant increase in z-directional tensile strength of dry web and and in-plane tensile strength properties of wet web was obtained. Based on the results, foam application technology can be a very useful technology for several applications in the paper industry.",
author = "Karita Kinnunen-Raudaskoski and Kristian Salminen and Jani Lehmonen and Tuomo Hjelt",
year = "2016",
language = "English",
volume = "15",
pages = "731--738",
journal = "Tappi Journal",
issn = "0734-1415",
publisher = "TAPPI Press",
number = "11",

}

Increased dryness after pressing and wet web strength by utilizing foam application technology. / Kinnunen-Raudaskoski, Karita; Salminen, Kristian; Lehmonen, Jani; Hjelt, Tuomo.

In: Tappi Journal, Vol. 15, No. 11, 2016, p. 731-738.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Increased dryness after pressing and wet web strength by utilizing foam application technology

AU - Kinnunen-Raudaskoski, Karita

AU - Salminen, Kristian

AU - Lehmonen, Jani

AU - Hjelt, Tuomo

PY - 2016

Y1 - 2016

N2 - Production cost savings by lowering basis weight has been a trend in papermaking. The strategy has been to decrease the amount of softwood kraft pulp and increase use of fillers and recycled fibers. These changes have a tendency to lower strength properties of both the wet and dry web. To compensate for the strength loss in the paper, a greater quantity of strength additives is often required, either dosed at the wet end or applied to the wet web by spray. In this pilot-scale study, it was shown how strength additives can be effectively applied with foambased application technology. The technology can simultaneously increase dryness after wet pressing and enhance dry and wet web strength properties. Foam application of polyvinyl alcohol (PVA), ethylene vinyl alcohol (EVOH), carboxymethyl cellulose (CMC), guar gum, starch, and cellulose microfibrils (CMF) increased web dryness after wet pressing up to 5.2%-units compared to the reference sample. The enhanced dewatering with starch, guar gum, and CMF was detected with a bulk increase. Additionally, a significant increase in z-directional tensile strength of dry web and and in-plane tensile strength properties of wet web was obtained. Based on the results, foam application technology can be a very useful technology for several applications in the paper industry.

AB - Production cost savings by lowering basis weight has been a trend in papermaking. The strategy has been to decrease the amount of softwood kraft pulp and increase use of fillers and recycled fibers. These changes have a tendency to lower strength properties of both the wet and dry web. To compensate for the strength loss in the paper, a greater quantity of strength additives is often required, either dosed at the wet end or applied to the wet web by spray. In this pilot-scale study, it was shown how strength additives can be effectively applied with foambased application technology. The technology can simultaneously increase dryness after wet pressing and enhance dry and wet web strength properties. Foam application of polyvinyl alcohol (PVA), ethylene vinyl alcohol (EVOH), carboxymethyl cellulose (CMC), guar gum, starch, and cellulose microfibrils (CMF) increased web dryness after wet pressing up to 5.2%-units compared to the reference sample. The enhanced dewatering with starch, guar gum, and CMF was detected with a bulk increase. Additionally, a significant increase in z-directional tensile strength of dry web and and in-plane tensile strength properties of wet web was obtained. Based on the results, foam application technology can be a very useful technology for several applications in the paper industry.

M3 - Article

VL - 15

SP - 731

EP - 738

JO - Tappi Journal

JF - Tappi Journal

SN - 0734-1415

IS - 11

ER -