Papermakers use a variety of non-fibrous additives in addition to cellulosic fibres to provide the different characteristics to paper. The interaction of these additives with fibres mainly depends on the surface and colloidal charge of both additives and fibres. Overdosing of ionic additives affects the equilibrium and wet-end chemistry thus adversely affects properties such as strength, optical and hydrophobicity. Among all additives, inorganic filler is added at the highest proportion in paper; this may be anionic or cationic based on its type and physico-chemical characteristics. The present paper deals with the role of colloidal and surface charge of inorganic filler as well as those of paper-making slurry on hydrophobicity of paper while using two different internal sizing chemicals viz., alkyl ketene dimer (AKD) and alkenyl succinic anhydride (ASA).
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