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WINDING PROCESS OF A CELLULOSIC FIBROUS MATERIAL; CATIONIC MATERIAL; AQUEOUS DISPERSION; NEUTRALIZATION PROCESS OF THE UNDESIRABLE ANIONIC SPECIES PRESENT IN A FIBER CELLULOSIC PULP; AND WINDING SHEET
WINDING PROCESS OF A CELLULOSIC FIBROUS MATERIAL; CATIONIC MATERIAL; AQUEOUS DISPERSION; NEUTRALIZATION PROCESS OF THE UNDESIRABLE ANIONIC SPECIES PRESENT IN A FIBER CELLULOSIC PULP; AND WINDING SHEET
A method of sizing cellulosic fibres materials for the formation of sheet products, e.g. paper, is carried out at a pH of 6-10 using a sizing agent and a cationic material, which is a powdered aluminium compound (preferably the hydroxide) on whose surface is a substance which is cationic at pH 6-10. The invention allows the use of rosin-based sizes at neutral-alkaline pHs and results in a paper with better aging and ink acceptance properties.
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