Interaction of dissolved and colloidal material during the mixing of different pulps



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Monte Lara, María Concepción and MacNeil, Donald and Negro Álvarez, Carlos Manuel and Blanco Suárez, Ángeles (2010) Interaction of dissolved and colloidal material during the mixing of different pulps. Holzforschung, 64 . pp. 277-283. ISSN 0018-3830 (print), 1437-434X (Online)

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Mixtures of stickies-containing and stickies-free pulps were investigated for their deposition potntial in an attempt to better understand the interactions of dissolved and colloidal material (DCM) when mixing two different pulps. The filtered pulp mixtures were tested in a deposition apparatus which measures both the dynamic fluid as well as impact deposition by an established optical scanning method. A pulp filtrate of model stickies led to deposition according to the proportion of stickies-containing pulp in the mixture. Other mixtures of pulps, however, led to deposition that differed from the predicted value. It is theorised that pulp fibres present in the mixture could adsorb the polysaccharides that would otherwise keep the colloidal system electrostatically stable. This destabilisation was most prominent at lower proportions of the stickies-free pulp suspensions used for mixing. These results show that care must be taken when mixing different pulps for paper and board production, as even a small amount of replacement pulp can lead to destabilisation of DCM and formation of deposits. Furthermore, special care must be taken when mixtures of pulps are used to validate stickies measurements.

Item Type:Article
Uncontrolled Keywords:Deposit formation, Dissolved and colloidal material, Papermaking, Paper recycling, Pulp mixtures, Stickies
Subjects:Sciences > Chemistry > Chemical engineering
Sciences > Chemistry > Environmental conditions
Sciences > Chemistry > Chemistry, Technical
Sciences > Chemistry > Paper industry
ID Code:11881
Deposited On:10 Jan 2011 16:56
Last Modified:05 Dec 2014 11:20

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