18 XXXX
KEMIRA
Pulp Paper & Logistics
Efficient paper machine hydrophobic particle control
M
of hydrophobic particles has characteristic for the risk of Concentration of wood fibres and fillers in the wet-end of a paper machine is less than 1 As the agglomeration of these particles proceeds in the wet- end of the paper machine, a particles may start to deposit on the surfaces of the paper machine equipment – wires, Uncontrolled agglomeration easily leads to poor runnability and the creation of defects such as holes, spots, specks, and hickeys in the final paper or Hydrophobic agglomerates in diameters up to 15 microns,
September/October 2014
paper or
Figure 1: Colloidal index from AutoFlite versus lab scale Kemira Flyto results
In the worst case scenario, it takes only four of these kinds of agglomerates to create a hole in Controlling the amount and
in the paper machine wet- end leads to optimum process attachment of these particles on fibre surfaces, enabling substances from the process
and monitor the agglomeration
measurement and process cytometry, which measures the hydrophobicity in samples taken numerous wood pitch and white pitch control programmes in full-
to laboratory measurements a new online measurement tool that can be used for monitoring hydrophobic load and process waters such as broke successfully installed on paper and board machines producing
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