Effects of the chemical composition of CTMP and dry strength additives on the strength of paper

Elias Retulainen, Ilkka Nurminen

Research output: Contribution to journalArticle in a proceedings journalScientificpeer-review

2 Citations (Scopus)


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)193-200
Number of pages8
JournalPreprints of papers to be presented at the annual meeting. Canadian Pulp and Paper Association. Technical Section
Issue numberpt B
Publication statusPublished - 1992
MoE publication typeA4 Article in a conference publication
Event78th Annual Meeting of the Canadian Pulp and Paper Association - Montreal, Que, Can
Duration: 30 Jan 199231 Jan 1992


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