Enhancing strength properties of kraft and CTMP fibre networks

E Retulainen, Kaarina Nieminen, Ilkka Nurminen

Research output: Contribution to journalArticleScientificpeer-review

Abstract

In this study possibilities to increase the strength of paper without causing deterioration on the optical properties were examined. Starches of different cationicity were applied to the long fibre fractions of a CTMP and a bleached kraft pulp and the effect of fines and dry strength additives was studied. The starch adsorption depended both on the anionicity of the pulp and the cationicity of the starch. The amount adsorbed was clearly greater with CTMP fibres despite of their lower surface area. The same starch, one of low cationicity, proved to be the most efficient strength aid with both types of fibres. The tensile strength of CTMP sheets could not, however, be increased much by addition of starch due to the low conformability of the fibres. The tensile strength of the kraft fibre network was increased appreciably by a kraft fines addition and the light scattering was increased by a TMP fines addition. In both cases, if the starch was added to the long fibres before fines addition, the tensile strength improved significantly. The results demonstrate the great potential of using fines properties as active control variables.
Original languageEnglish
Pages (from-to)33-38
JournalAppita Journal
Volume46
Issue number1
Publication statusPublished - 1993
MoE publication typeA1 Journal article-refereed

Fingerprint

Starch
Fibers
Tensile strength
Bleached pulp
Kraft pulp
Light scattering
Pulp
Deterioration
Optical properties
Adsorption

Keywords

  • fines
  • strength properties
  • optical properties
  • bonding
  • cationic starch

Cite this

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title = "Enhancing strength properties of kraft and CTMP fibre networks",
abstract = "In this study possibilities to increase the strength of paper without causing deterioration on the optical properties were examined. Starches of different cationicity were applied to the long fibre fractions of a CTMP and a bleached kraft pulp and the effect of fines and dry strength additives was studied. The starch adsorption depended both on the anionicity of the pulp and the cationicity of the starch. The amount adsorbed was clearly greater with CTMP fibres despite of their lower surface area. The same starch, one of low cationicity, proved to be the most efficient strength aid with both types of fibres. The tensile strength of CTMP sheets could not, however, be increased much by addition of starch due to the low conformability of the fibres. The tensile strength of the kraft fibre network was increased appreciably by a kraft fines addition and the light scattering was increased by a TMP fines addition. In both cases, if the starch was added to the long fibres before fines addition, the tensile strength improved significantly. The results demonstrate the great potential of using fines properties as active control variables.",
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author = "E Retulainen and Kaarina Nieminen and Ilkka Nurminen",
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Enhancing strength properties of kraft and CTMP fibre networks. / Retulainen, E; Nieminen, Kaarina; Nurminen, Ilkka.

In: Appita Journal, Vol. 46, No. 1, 1993, p. 33-38.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Enhancing strength properties of kraft and CTMP fibre networks

AU - Retulainen, E

AU - Nieminen, Kaarina

AU - Nurminen, Ilkka

PY - 1993

Y1 - 1993

N2 - In this study possibilities to increase the strength of paper without causing deterioration on the optical properties were examined. Starches of different cationicity were applied to the long fibre fractions of a CTMP and a bleached kraft pulp and the effect of fines and dry strength additives was studied. The starch adsorption depended both on the anionicity of the pulp and the cationicity of the starch. The amount adsorbed was clearly greater with CTMP fibres despite of their lower surface area. The same starch, one of low cationicity, proved to be the most efficient strength aid with both types of fibres. The tensile strength of CTMP sheets could not, however, be increased much by addition of starch due to the low conformability of the fibres. The tensile strength of the kraft fibre network was increased appreciably by a kraft fines addition and the light scattering was increased by a TMP fines addition. In both cases, if the starch was added to the long fibres before fines addition, the tensile strength improved significantly. The results demonstrate the great potential of using fines properties as active control variables.

AB - In this study possibilities to increase the strength of paper without causing deterioration on the optical properties were examined. Starches of different cationicity were applied to the long fibre fractions of a CTMP and a bleached kraft pulp and the effect of fines and dry strength additives was studied. The starch adsorption depended both on the anionicity of the pulp and the cationicity of the starch. The amount adsorbed was clearly greater with CTMP fibres despite of their lower surface area. The same starch, one of low cationicity, proved to be the most efficient strength aid with both types of fibres. The tensile strength of CTMP sheets could not, however, be increased much by addition of starch due to the low conformability of the fibres. The tensile strength of the kraft fibre network was increased appreciably by a kraft fines addition and the light scattering was increased by a TMP fines addition. In both cases, if the starch was added to the long fibres before fines addition, the tensile strength improved significantly. The results demonstrate the great potential of using fines properties as active control variables.

KW - fines

KW - strength properties

KW - optical properties

KW - bonding

KW - cationic starch

M3 - Article

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JO - Appita Journal

JF - Appita Journal

SN - 1038-6807

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