High consistency refining of kraft pulp for reinforcing paper based on TMP furnishes, 2007 International Mechanical Pulping Conference

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This study evaluated whether the reinforcement effect of bleached softwood kraft pulp fibres added to a thermomechanical pulp (TMP) based furnish for lightweight coated (LWC) paper could be improved by high consistency (HC) refining. There inforcement pulp was HC refined under various temperature and steam pressure conditions. Fibre and sheet properties, such as fibre length, fibre curl, tensile strength, strain at break and tensile energy absorption, of both isotropich and sheets and orthotropic paper were studied. There inforcement effect was estimated by fracture mechanics for a larger web containing a small crack. The critical force and critical elongation were calculated based on material parameters measured on laboratory made orthotropic papers.