Mixtures of Eucalyptus Grandis x Eucalyptus Urophylla and Pinus Taeda Woodchip for the Production of Kraft Pulping Using the Lo-Solids Process, 2007 Engineering, Pulping & Environmental Conference

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This work investigates the effects of Eucalyptus grandis x Eucalyptus urophylla and Pinus taeda wood mixtures on the Lo-Solids® process, and the characteristics of the pulps produced. The wood chip mixtures had 10% to 50% proportions of Pinus taeda. The results of the analysis indicated a downwards trend in total and screened yield and the viscosity of the pulp, on the levels of hexenuronic acids, on solubility in NaOH 5%, on the number of fibers per gram, on drainability, and on the tensile strength and burst indices, with an increased proportion of Pinus taeda in the mixtures. On the other hand, upwards trends were observed in levels of total lignin in the pulp, in fiber length and width, in coarseness, in the tear index, and in the specific consumption of wood as the proportion of Pinus taeda increased in the mixtures. The addition of 10% Pinus taeda fiber to Eucalyptus could improve the quality of the pulp for tear index parameters, with increments of up to 23.9%. For this mixture level it was, furthermore, possible to get a pulp yield of close to 50%, so generating satisfactory dry solid/odt content and wood consumption.