Effect of Substandard Aspen Wood Addition During Bisulfite Cooking on Pulp Characteristics and Yield
DOI:
https://doi.org/10.37482/0536-1036-2026-2-152-162Keywords:
aspen, core rot, bisulfite pulp, pulp properties, fibrous semi-finished productAbstract
The European part of Russia is dominated by mixed coniferous and deciduous forests. The use of soft-leaved species for pulp production makes it possible to fill the shortage of available forest wood resources, and in recent decades there has been an increase in the share of hardwood in the raw material base of the pulp and paper industry. Hardwood is susceptible to wood-destroying fungi, which makes it possible to classify it as low-quality raw material. Until recently, hardwood, and aspen in particular, was considered an unsuitable raw material for the pulp and paper industry. Research on the production of fibrous semi-pulp products from such wood and their use in the composition of various types of paper and cardboard is relevant and largely determines further scientific and technological progress in the pulp and paper industry. The aim of the work is a comprehensive study of the effect of aspen wood quality on the properties of high-yield bisulfite pulp used for the production of corrugating medium. The object of the study was a conditionally healthy aspen wood and wood affected by false tinder fungus (Phellinus tremulae). Laboratory cooking was carried out under the following conditions: liquor-to-wood ratio 5:1; SO2 consumption 15.0 %; cooking solution pH 4.3...4.5, final cooking temperature 165 °C, and cooking duration at the final temperature of 2.0 hours. It is shown that the structural and morphological characteristics of pulp fibers from decayed wood have specific features, expressed in a decrease in the geometric dimensions of the fibers. The strength characteristics of the obtained cellulose were compared with the quality indicators of hardwood semi-pulp used in the production of fluting. It was found that bisulfite aspen pulp (including pulp with 20 % rot content) is superior to semi-pulp in terms of breaking length and bursting strength, but inferior in terms of ring crush resistance. The paper demonstrates that the maximum possible content of substandard wood in a composition with healthy aspen wood, which does not cause a significant decrease in the structural, dimensional and mechanical quality of the semi-finished product, is 10 %.
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