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STUDY OF THE STABILITY OF SIZING WITH CETENA DIMETER (AKD) IN PAPER STRUCTURING FROM RECYCLED FIBER
In handling of recycled fiber there are several challenges such as: hornification, fiber length reduction, among other aspects such as the presence of residues of the chemical products used in the previous generation (s) or anionic garbage. This study evaluated the impact of the anionic waste of white water, as well as its neutralization on the process of sizing with alkyl ketene dimer (AKD) in the structuring of the paper sheet using recycled kraft fiber whose objective is to evaluate the reversion of sizing as a function the cationic demand of the system during the storage time. The experiments were carried out in a standard sheet former (TAPPI) with the addition of anionic trash sweeper, sizing agent and retention agent in the sizing process. The value of Cobb60 was used to measure the response of the sizing degree using set point at zero min and up to 4 weeks of storage. The response of the cationic demand in this study is modified by the addition of the anionic garbage sweeper. The efficiency of sizing increases when the cationic demand decreases, reaching a maximum of sizing at 24 g/m2 in Cobb60 value. The reversion of the sizing occurs when there is a high cationic demand in the structuring system of the paper sheet, that is, when there is no neutralization of the anionic garbage of the system.