Effect of electrolytes, pH and surface tension on dry and wet web properties

H. Lindqvist, Kristian Salminen, Janne Kataja-aho, A. Sundberg, B. Holmbom, Elias Retulainen

Research output: Contribution to journalArticleScientificpeer-review

9 Citations (Scopus)

Abstract

The most critical factors affecting runnability of paper machines are the tension and relaxation properties of wet paper. In this study, the effect of electrolytes, pH and surface tension on dry and wet web properties was investigated. Addition of a non-ionic surfactant at pH 6.5 and conductivity level of 1 mS/cm, achieved by addition of CaCl2, decreased surface tension and increased dry content. Density, air permeability and tensile strength increased for dry sheets. Tensile strength and residual tension at 2% strain of the wet web increased until a concentration of 0.25 g of surfactant/L of water, primarily due to the increased dry content. Lowering of pH from 6.5 to 5, decreased dry content after wet pressing and air permeability of dry sheets. Adjustment of conductivity with NaCl caused a decrease in both tensile strength and residual tension for wet sheets.
Original languageEnglish
Pages (from-to)148-154
Number of pages7
JournalJournal of Pulp and Paper Science
Volume35
Issue number3-4
Publication statusPublished - 2009
MoE publication typeA1 Journal article-refereed

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Electrolytes
Surface tension
Air permeability
Tensile strength
Nonionic surfactants
Surface-Active Agents
Surface active agents
Water

Cite this

Lindqvist, H. ; Salminen, Kristian ; Kataja-aho, Janne ; Sundberg, A. ; Holmbom, B. ; Retulainen, Elias. / Effect of electrolytes, pH and surface tension on dry and wet web properties. In: Journal of Pulp and Paper Science. 2009 ; Vol. 35, No. 3-4. pp. 148-154.
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abstract = "The most critical factors affecting runnability of paper machines are the tension and relaxation properties of wet paper. In this study, the effect of electrolytes, pH and surface tension on dry and wet web properties was investigated. Addition of a non-ionic surfactant at pH 6.5 and conductivity level of 1 mS/cm, achieved by addition of CaCl2, decreased surface tension and increased dry content. Density, air permeability and tensile strength increased for dry sheets. Tensile strength and residual tension at 2{\%} strain of the wet web increased until a concentration of 0.25 g of surfactant/L of water, primarily due to the increased dry content. Lowering of pH from 6.5 to 5, decreased dry content after wet pressing and air permeability of dry sheets. Adjustment of conductivity with NaCl caused a decrease in both tensile strength and residual tension for wet sheets.",
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Lindqvist, H, Salminen, K, Kataja-aho, J, Sundberg, A, Holmbom, B & Retulainen, E 2009, 'Effect of electrolytes, pH and surface tension on dry and wet web properties', Journal of Pulp and Paper Science, vol. 35, no. 3-4, pp. 148-154.

Effect of electrolytes, pH and surface tension on dry and wet web properties. / Lindqvist, H.; Salminen, Kristian; Kataja-aho, Janne; Sundberg, A.; Holmbom, B.; Retulainen, Elias.

In: Journal of Pulp and Paper Science, Vol. 35, No. 3-4, 2009, p. 148-154.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Effect of electrolytes, pH and surface tension on dry and wet web properties

AU - Lindqvist, H.

AU - Salminen, Kristian

AU - Kataja-aho, Janne

AU - Sundberg, A.

AU - Holmbom, B.

AU - Retulainen, Elias

PY - 2009

Y1 - 2009

N2 - The most critical factors affecting runnability of paper machines are the tension and relaxation properties of wet paper. In this study, the effect of electrolytes, pH and surface tension on dry and wet web properties was investigated. Addition of a non-ionic surfactant at pH 6.5 and conductivity level of 1 mS/cm, achieved by addition of CaCl2, decreased surface tension and increased dry content. Density, air permeability and tensile strength increased for dry sheets. Tensile strength and residual tension at 2% strain of the wet web increased until a concentration of 0.25 g of surfactant/L of water, primarily due to the increased dry content. Lowering of pH from 6.5 to 5, decreased dry content after wet pressing and air permeability of dry sheets. Adjustment of conductivity with NaCl caused a decrease in both tensile strength and residual tension for wet sheets.

AB - The most critical factors affecting runnability of paper machines are the tension and relaxation properties of wet paper. In this study, the effect of electrolytes, pH and surface tension on dry and wet web properties was investigated. Addition of a non-ionic surfactant at pH 6.5 and conductivity level of 1 mS/cm, achieved by addition of CaCl2, decreased surface tension and increased dry content. Density, air permeability and tensile strength increased for dry sheets. Tensile strength and residual tension at 2% strain of the wet web increased until a concentration of 0.25 g of surfactant/L of water, primarily due to the increased dry content. Lowering of pH from 6.5 to 5, decreased dry content after wet pressing and air permeability of dry sheets. Adjustment of conductivity with NaCl caused a decrease in both tensile strength and residual tension for wet sheets.

M3 - Article

VL - 35

SP - 148

EP - 154

JO - J-FOR: Journal of Science & Technology for Forest Products and Processes

JF - J-FOR: Journal of Science & Technology for Forest Products and Processes

SN - 1927-6311

IS - 3-4

ER -