Papermaking quality of fines from different pulps: The effect of size, shape and chemical composition

E. Retulainen, K. Luukko, K. Fagerholm, Jaakko Pere, J. Laine, H. Paulapuro

Research output: Contribution to journalArticleScientificpeer-review

62 Citations (Scopus)

Abstract

The fines of chemical pulps have a strong tendency to intensify the interaction between fibres. This is mainly due to the increased density of the network. A sheet made of kraft fines has a remarkably high density, 1100 to 1200 kg/m3, whereas a handsheet made of TMP fines has a rather low density, about 450 kg/m3. In this study several pulps were compared. The fines formed a spectrum ranging from fines of bleached softwood kraft to the fines of mechanical pulp. The differences in bonding ability between softwood and hardwood kraft fines, as well as between bleached and unbleached softwood kraft fines, were rather small. Clearly larger differences in bonding ability can be found between different subfractions of fines from a certain chemical pulp. The smaller particles have better bonding ability. In addition to the size of the fines particles, the shape also seems to be an important factor. Additionally, the results indicate that the size, shape and chemical composition of the fines fraction are intercorrelated.
Original languageEnglish
Pages (from-to)457-460,467
JournalAppita Journal
Volume55
Issue number6
Publication statusPublished - 2002
MoE publication typeA1 Journal article-refereed

Keywords

  • Fines
  • chemical pulp
  • mechanical pulp
  • paper properties
  • chemical composition
  • particle size
  • particle shape

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