Chemical Composition and Wood Anatomy of<i>Eucalyptus globulus</i>Clones: Variations and Relationships with Pulpability and Handsheet Properties

Ramı́rez, Mario; Rodríguez, José Robles; Balocchi, Claudio; Peredo, M.; Elissetche, Juan Pedro; Mendonça, Regis Teixeira; Valenzuela, Sofía

doi:10.1080/02773810802607559

Cited by 28 publications

(19 citation statements)

References 10 publications

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“…2). Both values are consistent with the few available studies: 15.2% of bark content for 7-and 11-year-old E. globulus trees (Ramírez et al 2009, Miranda et al 2012, values between 13.6% and 15.9% in 4-year-old E. grandis (Sansígolo & Ramos 2011), and 20.2% for E. urophylla at seven years of age (Jesus et al 1988).…”

Section: Bark Content and Densitysupporting

confidence: 88%

Variation of wood and bark density and production in coppiced Eucalyptus globulus trees in a second rotation

Miranda¹,

Pereira²

2016

iForest

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Coppiced Eucalyptus globulus trees with 18 years of age and in a second rotation were analysed in relation to wood and bark density in a spacing trial with five initial plant densities. A total of 25 stumps, with a variable number of stems per stump, from one to three, were analysed. A comparison was made to the previous first rotation single stem trees, also harvested at 18 years of age. The average wood basic density at breast height of the eucalypt coppiced trees was 567 kg m . The mean bark density was comparable to the bark density in the first rotation. The average bark content was 17.4% of the stem volume, providing 25 to 52 ton ha -1 . Compared to the first rotation, the average tree volume in the coppice was lower because the individual trees were smaller by 40 to 66%, while the estimated volume production per ha of the coppice was 1.1 to 1.8 times more due to the increased number of trees that were left in each stump.

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Section: Bark Content and Densitysupporting

confidence: 88%

Variation of wood and bark density and production in coppiced Eucalyptus globulus trees in a second rotation

Miranda¹,

Pereira²

2016

iForest

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“…However, due to the higher extractives content in heartwood, when the total lignin is reported to original wood, the values are slightly different: 24.3% and 23.5%, respectively for sapwood and heartwood (Lourenço et al 2010). These are values in the range of values reported for E. globulus wood of 24.2% to 27.9% (Miranda and Pereira 2002b); 24.7% to 31.2% (Poke et al 2006); 25.4% (Ramírez et al 2009); or 24.5% (Rencoret et al 2011), while a somewhat lower value of 21.9% was reported by Patt et al (2006). It is known that such amplitude of values is due to different factors such as wood origin (Miranda and Pereira 2002b;Poke et al 2006) or age of the tree (Miranda and Pereira 2002c).…”

Section: Lignin Determination By Wet Chemistrymentioning

confidence: 54%

Comparison of Py-GC/FID and Wet Chemistry Analysis for Lignin Determination in Wood and Pulps from Eucalyptus globulus

Lourenço¹,

Gominho²,

Marques³

et al. 2013

BioResources

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The kraft pulps produced from heartwood and sapwood of Eucalyptus globulus at 130 ºC, 150 ºC, and 170 ºC were characterized by wet chemistry (total lignin as sum of Klason and soluble lignin fractions) and pyrolysis (total lignin denoted as py-lignin). The total lignin content obtained with both methods was similar. In the course of delignification, the py-lignin values were higher (by 2 to 5%) compared to Klason values, which is in line with the importance of soluble lignin for total lignin determination. Pyrolysis analysis presents advantages over wet chemical procedures, and it can be applied to wood and pulps to determine lignin contents at different stages of the delignification process. The py-lignin values were used for kinetic modelling of delignification, with very high predictive value and results similar to those of modelling using wet chemical determinations.

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“…It is known that the size of vessels increases as cambial age increases (Hudson et al 1998, Leal et al 2003, Carrillo et al 2015. Same pattern of increasing values from pith to bark is known for fibre width, cell wall thickness, fibre length, wood density and coarseness (Miranda and Pereira 2002, Ohshima et al 2004, Quilhó et al 2006, Ramírez et al 2009, Carrillo et al 2015. These assertions are in agreement with the results found for the sapwood section, close to the bark, and the heartwood section, close to the pith, in B. spiciformis and P. angolensis.…”

Section: Anatomical Characterization Of Woodmentioning

confidence: 90%

“…High-density woods (more than 600 kg m -3 ) are usually associated with tylosis formation or extractives deposition in lumens that lead to an irregular delignification of wood chips. Which is mainly due to the poor efficiency of the impregnation with the cooking liquors (Ramírez et al 2009). Anatomically, P. angolensis wood also presented occluded fibre lumen, which can represent an important drawback for reagent diffusion during pulping procedures.…”

Section: Kraft Pulpingmentioning

confidence: 99%

An exploratory evaluation of the pulpability of Brachystegia spiciformis and Pericopsis angolensis from the angolan miombo woodlands

Sangumbe¹,

Pereira²,

Carrillo³

et al. 2018

Maderas, Cienc. tecnol.

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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 -3and 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.m 2 g -1 and 4,9 kPa.m 2 g -1 , respectively. Brachystegia spiciformis pulps reached tensile, tear and burst indexes of 100,3 Nm g -1 ; 10,7 mN.m 2 g -1 and 6,1 kPa.m 2 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.

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Chemical Composition and Wood Anatomy ofEucalyptus globulusClones: Variations and Relationships with Pulpability and Handsheet Properties

Cited by 28 publications

References 10 publications

Variation of wood and bark density and production in coppiced Eucalyptus globulus trees in a second rotation

Variation of wood and bark density and production in coppiced Eucalyptus globulus trees in a second rotation

Comparison of Py-GC/FID and Wet Chemistry Analysis for Lignin Determination in Wood and Pulps from Eucalyptus globulus

An exploratory evaluation of the pulpability of Brachystegia spiciformis and Pericopsis angolensis from the angolan miombo woodlands

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