Effect of Ca2+-Pectates on Drainage and Paper Properties of Mechanical Pulp

V Saarimaa, Anna Sundberg, Bjarne Holmbom

    Forskningsoutput: TidskriftsbidragArtikelVetenskapligPeer review

    1 Citeringar (Scopus)

    Sammanfattning

    The effect of Ca2+ and model pectic acids of different molar mass on drainage, sheet properties and heat-induced yellowing of TMP was studied. The aggregation of pectic acids by Ca2+ was strongly dependent on the molar mass of pectic acids. Ca2+-concentrations over 0.3 mmol/L induced strong retention of pectic acids with molar mass > 7.8 kDa. The retained Ca2+-pectates resulted in impaired drainage rate. The formed paper sheets were thicker and the grammage was slightly higher. Also brightness was decreased. Pectic acids are slightly coloured compounds, the yellowish colour becoming stronger at lower molar mass, and they showed some contribution to heat-induced brightness reversion.
    OriginalspråkOdefinierat/okänt
    Sidor (från-till)85–90
    Antal sidor6
    TidskriftJournal of Pulp and Paper Science
    Volym34
    Utgåva2
    StatusPublicerad - 2008
    MoE-publikationstypA1 Tidskriftsartikel-refererad

    Nyckelord

    • CALCIUM
    • DRAINAGE
    • MECHANICAL PULP
    • PECTIC ACIDS
    • SHEET PROPERTIES

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