A method of preparing pulps for manufacturing sized papers by the addition of only one sizing agent and related sizing agent

摘要

A method for continuously producing sized papers, uses only one sizing compostion admixed to the paper pulp before feeding the paper machine, said sizing composition consisting of mixtures of aqueous solutions of aluminum sulfate and aqueous dispersions of gemma rosin and/or tall oil modified or not with maleic anhydride and/orfumaric acid with possible addition of cationic holdup agents.