Eucalyptus globulus Stumpwood as a Raw Material for Pulping

Abstract

In this study, Eucalyptus globulus stumpwood samples collected from six different sites in Portugal were evaluated for their ease of pulping, using two delignification processes (kraft and alkaline sulfite-anthraquinonemethanol (ASAM)). Morphologically, the stumpwood included fibers with a mean length of 0.930 mm, diameter of 21.4 µm, lumen width of 9.1 µm, and cell-wall thickness of 6.1 µm. The Runkel ratio varied between 1.0 and 1.9, and the slenderness ratio ranged between 50.6 and 35.1. ASAM pulps presented higher yields and kappa numbers (49.3% and 36, respectively) when compared to kraft pulps (42.7% and 14, respectively). Extractive-free material increased pulp yield (51.7% and 47.5% for ASAM and kraft, respectively) and decreased kappa number (18 and 11). The kraft pulps showed a coarseness of 0.096 mg/m, curl of 5.2%, and 16.7% kinked fibers, while for the ASAM pulps, these values were 0.105 mg/m, 5.2%, and 16.3%, respectively.

Characterization and within-tree variation of wood anatomy of Acacia melanoxylon

“…The potential of E. globulus wood for pulp and paper is well known. For E. globulus wood, Patt et al (2006) found RK values of 0.56 and Gominho et al (2014) RK values ranging between 1.0 and 1.9. The RK values found for A. melanoxylon are close to the values reported for E. globulus wood, thus supporting its potential for pulp and paper.…”

Papermaking as Potential Use of Fibers from Mexican Opuntia ficus-indica Waste

“…In agreement with this finding, the lower stretch % of sheets produced with OFI waste pulp compared to that of sheets produced with eucalyptus pulp can be explained as follow. Although the fiber length for OFI (1.1 mm) and eucalyptus (0.93 mm) is similar, the wall thickness is thicker for the eucalyptus fibers (6.1 µm) than for OFI fibers (4.3 µm) (Gominho et al, 2014). Therefore, the lower stretch % obtained for the OFI waste sheets shows its poor flexibility compared to the high flexibility reported for eucalyptus.…”

“…Fiber length of OFI waste is in the range of hardwoods (0.7 -1.5 mm) and within the range (1.0-2.5 mm) of non-wood fibers such as sugarcane bagasse, rapeseed straw, kenaf and sunflower stalk. The length of OFI waste fibers was similar to that of rapeseed straw, sunflower stalk and eucalyptus, but smaller than sugarcane bagasse, kenaf and pine fibers (Ashori et al, 2006;Khristova et al, 2006;Mazhari Mousavi et al, 2013;Gominho et al, 2014;Gulsoy and Ozturk, 2015;Rudi et al, 2016). Fibers with low (<1) Runkel ratio are assessed to be efficient for sheet formation by the combination effect of thin walls and wide lumen.…”

Pinus halepensis and Eucalyptus camaldulensis grown in Egypt: A comparison between stem and branch properties for pulp and paper making

“…The fiber length value reported herein for E. camaldulensis was higher than that measured for the same species grown in Sudan (0.76 mm) (Gamal and Abdelgadir 2015). The fiber length measured for Eucalyptus globulus stump wood at six different sites ranged from 0.812 to 1.121 mm (Gominho et al 2014). The fiber length's average value reported for P. nigra juvenile wood was 1.12 mm.…”