Effects of Sodium chlorite delignification and alkaline extraction on bonding of CTMP fibres and the efficiency of dry strength additives

Research output: Contribution to journalArticleScientificpeer-review

Abstract

The strength properties of the long fibre fraction of mechanical pulp are limited by its low bondability. In this study the bonding ability of the long fibre fraction of CTMP is affected by chemical treatments (acid sodium chlorite delignification and alkaline extraction) and by dry strength additives. The chemical treatments mainly increase the fibre conformability (flexibility and collapsability). The acid sodium chlorite treatment also increases the specific bond strength. The dry strength additives increase the strength properties without affecting the sheet structure but the increase is small when the relative bonded area is small. The efficiency of the dry strength chemicals is higher when the conformability of the fibres is higher. The increase in the number of acidic groups with chlorite delignification did not affect fibre swelling much nor the ranking order of the different cationic starches.
Original languageEnglish
Pages (from-to)499-504
JournalPaperi ja puu
Volume75
Issue number7
Publication statusPublished - 1993
MoE publication typeA1 Journal article-refereed

Fingerprint

chlorites
delignification
Delignification
chlorite
Sodium
sodium
chemical treatment
Fibers
mechanical pulp
acids
Mechanical pulp
Acids
starch
acid
Starch
swelling
ranking
Swelling
fibre
effect

Keywords

  • mechanical pulp
  • chemimechanical pulp
  • chemical modification
  • dry strength
  • starch
  • carboxymethyl cellulose

Cite this

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title = "Effects of Sodium chlorite delignification and alkaline extraction on bonding of CTMP fibres and the efficiency of dry strength additives",
abstract = "The strength properties of the long fibre fraction of mechanical pulp are limited by its low bondability. In this study the bonding ability of the long fibre fraction of CTMP is affected by chemical treatments (acid sodium chlorite delignification and alkaline extraction) and by dry strength additives. The chemical treatments mainly increase the fibre conformability (flexibility and collapsability). The acid sodium chlorite treatment also increases the specific bond strength. The dry strength additives increase the strength properties without affecting the sheet structure but the increase is small when the relative bonded area is small. The efficiency of the dry strength chemicals is higher when the conformability of the fibres is higher. The increase in the number of acidic groups with chlorite delignification did not affect fibre swelling much nor the ranking order of the different cationic starches.",
keywords = "mechanical pulp, chemimechanical pulp, chemical modification, dry strength, starch, carboxymethyl cellulose",
author = "E Retulainen and Ilkka Nurminen",
year = "1993",
language = "English",
volume = "75",
pages = "499--504",
journal = "Paperi ja puu",
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}

Effects of Sodium chlorite delignification and alkaline extraction on bonding of CTMP fibres and the efficiency of dry strength additives. / Retulainen, E; Nurminen, Ilkka.

In: Paperi ja puu, Vol. 75, No. 7, 1993, p. 499-504.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Effects of Sodium chlorite delignification and alkaline extraction on bonding of CTMP fibres and the efficiency of dry strength additives

AU - Retulainen, E

AU - Nurminen, Ilkka

PY - 1993

Y1 - 1993

N2 - The strength properties of the long fibre fraction of mechanical pulp are limited by its low bondability. In this study the bonding ability of the long fibre fraction of CTMP is affected by chemical treatments (acid sodium chlorite delignification and alkaline extraction) and by dry strength additives. The chemical treatments mainly increase the fibre conformability (flexibility and collapsability). The acid sodium chlorite treatment also increases the specific bond strength. The dry strength additives increase the strength properties without affecting the sheet structure but the increase is small when the relative bonded area is small. The efficiency of the dry strength chemicals is higher when the conformability of the fibres is higher. The increase in the number of acidic groups with chlorite delignification did not affect fibre swelling much nor the ranking order of the different cationic starches.

AB - The strength properties of the long fibre fraction of mechanical pulp are limited by its low bondability. In this study the bonding ability of the long fibre fraction of CTMP is affected by chemical treatments (acid sodium chlorite delignification and alkaline extraction) and by dry strength additives. The chemical treatments mainly increase the fibre conformability (flexibility and collapsability). The acid sodium chlorite treatment also increases the specific bond strength. The dry strength additives increase the strength properties without affecting the sheet structure but the increase is small when the relative bonded area is small. The efficiency of the dry strength chemicals is higher when the conformability of the fibres is higher. The increase in the number of acidic groups with chlorite delignification did not affect fibre swelling much nor the ranking order of the different cationic starches.

KW - mechanical pulp

KW - chemimechanical pulp

KW - chemical modification

KW - dry strength

KW - starch

KW - carboxymethyl cellulose

M3 - Article

VL - 75

SP - 499

EP - 504

JO - Paperi ja puu

JF - Paperi ja puu

SN - 0031-1243

IS - 7

ER -