Sizing Performance of the Cationic Rosin Emulsion Size at Near Neutral Conditions

Watanabe, Masakatsu; Matsushima, Kunihiko; Chigira, Fumie

doi:10.2524/jtappij.53.985

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“…has considered many issues (Nitzman and Royapaa 2003;Zou et al 2004a,b;Bajpai 2005;Hubbe 2005Hubbe , 2006Zhijie 2006;Hamzeh et al 2008;Bergvall 2013), the subject of cationic rosin seems to need more attention. Although its application became prevalent by the late 1990s (Ehrhardt and Gast 1988;Nitzman and Royapaa 2003), the scientific and laboratory information about different aspects such as the main mechanism underlying the hydrophobizing effect, its tolerance domain in complex wet end chemistry of recycled mill (high conductivity suspension, highly cationic demand,…), the effect of alum presence, the influence of sequence of alum/rosin addition, and the effect of suspension pH, etc., remain unclear (Daniel and Moore 1956;Watanabe et al 1999;Hubbe 2005). Some of these areas, such as sequence of addition, pH adjustment, and assessing the tolerance, can provide a proper lead to optimize the process situation.…”

Section: Introductionmentioning

confidence: 99%

Process Variables and the Performance of Cationic Rosin as an Internal Sizing Agent in Recycled Corrugated Container Pulp

2016

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Cationic rosin has many uses in papermaking; however, its performance as an internal sizing agent differs depending on the circumstance, especially in the recycling of pulps. In this study, a comprehensive laboratory approach was used to investigate the process variables affecting the cationic rosin application in the paper recycling process. In this respect, four levels of alum (0.5, 1.0, 1.5, and 2.0%) and four levels of cationic rosin (0.5, 1.0, 1.5, and 2.0%) were considered to find the best alum/cationic rosin combination in acidic conditions (pH 5). After considering all aspects of the paper, such as the mechanical properties (tensile, burst, and tear indices), wet resistance (Cobb test and dynamic contact angle test), and chemical usage (economically and environmentally-friendly procedures), the 1.0% alum and 0.5% cationic rosin levels were selected for optimum performance. This research also showed that the combined effect of alum with cationic rosin was favorable. Moreover, the sequence of alum and cationic rosin addition, which is a challenge in paper mills, also should be considered. The results indicated that the addition of cationic rosin after alum obtained the best mechanical and wet resistance results. In addition, the results showed that both acidic and neutral pH were acceptable in this sizing process.

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Section: Introductionmentioning

confidence: 99%