Application of PVAM for strength improvement of TMP mixed tissue paper

초록

In this study, dual dry strength agents (PVAm and anionic PAM) with fast adsorption rate were used to improve the strength properties of TMP mixed tissue paper which is difficult to retain fines. The retention of fines, formation and strength properties of handsheets were evaluated according to the mechanical beating of pulp slurry and addition level of PVAm and anionic PAM. In addition, dual system and conventional cationic PAM were added before and after beating in order to compare the effect of dry strength agents on the physical properties of handsheets. The dual system (PVAm and anionic PAM) which shows the free conformation of polymer chains based on a simple structure and few steric hindrance compared with conventional cationic PAM, is analyzed to exhibit a better strength enhancement when the fiber length is long before beating, but there was no significant effect on retention. Also, the dual system improved the physical properties of handsheets even when the pulp slurry was beaten to 600 mL CSF to improve the plausibility of fibers. In terms of fines retention, dual system did not show a tendency depending on the dosage of PVAm, however, 3% dosage of PVAm is most appropriate, judging based on the improvement of physical properties of handsheets. Consequentially, the rapid adsorption of PVAm makes it possible to easily change the charge of the fiber surface to strong cationic, and then to induce rapid adsorption of anionic PAM to improve the strength without contamination due to the formation of residual polymeric complex. © EBSCO Information Services 2018. All rights reserved.

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