Novel retention technologies improve ash retention and productivity, PaperCon '09 Conference

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Two novel approaches to retention and drainage chemistry have been developed providing improved ash retention and machine productivity in paper manufacturing. The first is a bi-molecular cationic aqueous dispersion polymer (water-in-water referred to as W/W), and the second is a bi-molecular cationic inverse emulsion polymer (water-in-oil referred to as W/O). The unique feature of these products is that they combine two polymers with different molecular weights and cationic charges. These new products have been successfully used as retention aids for a variety of paper grades with demonstrated improvements in key parameters such as ash retention, formation, runnability and sheet quality as compared to standard retention programs available in the market. Case histories are presented that highlight key benefits.