Challenges and demands towards higher filler levels in white top liner and fine paper, 2012 PaperCon Conference

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With pulp prices being high, paper makers looking to reduce costs are constantly trying to increase the filler level in their paper. The optical properties will often benefit from increased filler content but the mechanical properties will deteriorate and the retention can be difficult to maintain. The reasons for a weaker paper sheet in a highly filled paper are fewer fibres per unit volume paper and filler particles interfering and disturbing the formation of fibre/fibre bonds plus the risk of filler particles creating defects in the paper material [1].