Differences on fibre level between GW and TMP for magazine grades, 2007 International Mechanical Pulping Conference

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In paper making, surface properties are of major importance for the printability of the final paper. It is therefore essential to identify the fundamental fibre properties causing surface problems in order to be able to improve the final paper. It is well known that the amount of intact fibres is higher in TMP than in GW. It is also believed that thick-walled intact fibres, especially large-diameter fibres, are negative for surface properties. When TMP and GW for magazine grades are analyzed with respect to fibre dimensions by scanning electron microscopy (SEM) images of fibre cross-sections, far more thick-walled fibres are found in TMP than in GW. It is therefore probably more important in quality control to focus on thick-walled fibres for TMP than for GW. On the other hand the amount of shives is considerably higher for GW than for TMP and such material is also negative for the surface properties.