An exploratory evaluation of the pulpability of Brachystegia spiciformis and Pericopsis angolensis from the angolan miombo woodlands
Author
Vicente Sangumbe, Lino Manuel
Pereira, Miguel
Carrillo, Isabel
Teixeira Mendonça, Regis
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Afrikáans
Albanés
Alemán
Árabe
Armenio
Azerí
Bengalí
Bielorruso
Birmano
Bosnio
Búlgaro
Canarés
Catalán
Cebuano
Checo
Chichewa
Chino (Simp)
Chino (Trad)
Cincalés
Coreano
Criollo haitiano
Croata
Danés
Eslovaco
Esloveno
Español
Esperanto
Estonio
Euskera
Finlandés
Francés
Galés
Gallego
Georgiano
Griego
Gujarati
Hausa
Hebreo
Hindi
Hmong
Holandés
Húngaro
Igbo
Indonesio
Inglés
Irlandés
Islandés
Italiano
Japonés
Javanés
Jemer
Kazajo
Lao
Latín
Letón
Lituano
Macedonio
Malayalam
Malayo
Malgache
Maltés
Maorí
Maratí
Mongol
Nepalí
Noruego
Persa
Polaco
Portugués
Punjabí
Rumano
Ruso
Serbio
Sesoto
Somalí
Suajili
Sueco
Sundanés
Tagalo
Tailandés
Tamil
Tayiko
Telugu
Turco
Ucraniano
Urdu
Uzbeco
Vietnamita
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Yoruba
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Cerrar Brachystegia spiciformis and Pericopsis angolensis are two hardwood species found in the Miombo 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. Brachystegia spiciformis wood density was 640 kg m-3 and Pericopsis angolensis was 795 kg m-3. Pericopsis angolensis 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 Brachystegia spiciformis were 1.5, 65.7, 41.2% and 29.4%, while in Pericopsis angolensis these values were 17.6, 59.9, 5.4% and 47.3%, respectively. Brachystegia spiciformis has a higher cellulose content, lower hemicellulose and lignin content, and higher S/G ratio than Pericopsis angolensis. 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. Pericopsis angolensis pulps reached tensile, tear and burst indexes of 99.6 Nm g-1, 5.9 mN.m2 g-1 and 4.9 kPa.m2 g-1, respectively. Brachystegia spiciformis pulps reached tensile, tear and burst indexes of 100.3 Nm g-1, 10.7 mN.m2 g-1 and 6.1 kPa.m2 g-1, respectively. As a conclusion, Brachystegia spiciformis wood has better pulpability than Pericopsis angolensis 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.