@article{Vicente Sangumbe_Pereira_Carrillo_Teixeira Mendonça_2018, title={An exploratory evaluation of the pulpability of Brachystegia spiciformis and Pericopsis angolensis from the angolan miombo woodlands}, volume={20}, url={https://revistas.ubiobio.cl/index.php/MCT/article/view/3034}, abstractNote={<p><em>Brachystegia spiciformis</em> and <em>Pericopsis angolensis</em> are two hardwood species found in the <em>Miombo</em> woodlands. The wood features, kraft pulping and strength pulp properties of both species were evaluated in order to determine their potential as raw material for papermaking. <em>Brachystegia spiciformis</em> wood density was 640 kg m<sup>-3 </sup>and <em>Pericopsis angolensis</em> was 795 kg m<sup>-3</sup>. <em>Pericopsis angolensis </em>wood has higher cell wall thickness and occluded fibre lumen as remarkable anatomical properties. Runkel ratio, slenderness ratio, and the coefficients of flexibility and rigidity in <em>Brachystegia spiciformis</em> were 1.5, 65.7, 41.2% and 29.4%, while in <em>Pericopsis angolensis</em> these values were 17.6, 59.9, 5.4% and 47.3%, respectively. <em>Brachystegia spiciformis</em> has a higher cellulose content, lower hemicellulose and lignin content, and higher S/G ratio than <em>Pericopsis angolensis</em>. In kraft pulping, a higher demand of active alkali was needed for both species, and pulps with high kappa number (24–27) and low pulp yield (40%) were obtained. <em>Pericopsis angolensis</em> pulps reached tensile, tear and burst indexes of 99.6 Nm g<sup>-1</sup>, 5.9 mN.m<sup>2</sup> g<sup>-1</sup> and 4.9 kPa.m<sup>2</sup> g<sup>-1</sup>, respectively. <em>Brachystegia spiciformis</em> pulps reached tensile, tear and burst indexes of 100.3 Nm g<sup>-1</sup>, 10.7 mN.m<sup>2</sup> g<sup>-1</sup> and 6.1 kPa.m<sup>2</sup> g<sup>-1</sup>, respectively. As a conclusion, <em>Brachystegia spiciformis</em> wood has better pulpability than <em>Pericopsis angolensis</em> wood, according to its pulps properties, despite of the similar pulp yield between both species. Both species may be suitable for unbleached wrapping papers and rigid cardboards manufacturing.</p>}, number={2}, journal={Maderas-Cienc Tecnol}, author={Vicente Sangumbe, Lino Manuel and Pereira, Miguel and Carrillo, Isabel and Teixeira Mendonça, Regis}, year={2018}, month={Apr.}, pages={183–198} }