Evaluation of vessel picking tendency in printing

Sari Asikainen (Corresponding Author), Agneta Fuhrmann, Merja Kariniemi, Airi Särkilahti

    Research output: Contribution to journalArticleScientificpeer-review

    1 Citation (Scopus)


    Bleached eucalyptus kraft pulps, Eucalyptus globulus and Eucalyptus grandis, were fractionated using a hydrocyclone (Bauer 3”) in order to enrich the vessel elements in one of the fractions. The vessel picking tendency was analyzed with a method developed at KCL. In this method, handsheets are printed with a full scale 4-colour sheet-fed offset printing machine using a commercial printing ink. The vessel picking printing test was performed on the unfractionated eucalyptus kraft pulps, the vessel-rich and the vesselpoor fractions. The picked particles were analyzed and counted using an image analyzer. The vessel picking printing test was also done on the vessel-rich fractions after a PFI mill beating at 2000 revolutions. Hydrocyclone separated the vessels according to their size and shape successfully. The microscopy analysis showed that vessels in the vessel-rich fraction were larger and more square-shaped than those in the vessel-poor pulp. The refining of the vessel-rich fraction decreased the vessel picking tendency to the same or even to a lower level than that of the unfractionated pulp.
    Original languageEnglish
    Pages (from-to)44-50
    Number of pages6
    JournalO Papel
    Issue number1
    Publication statusPublished - 2012
    MoE publication typeA1 Journal article-refereed


    • chemical composition
    • fiber morphology
    • fractionation
    • refining
    • vessel picking


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