Quality of wood and pulp from a clone of Eucalyptus grandis planted at three locations

Abstract

ABSTRACT:Eucalyptus grandis is one of the most popular species to use as raw material for pulp production in Brazil, as it provides excellent pulping, bleaching and papermaking results. The main objective of this study is to examine the quality of wood and pulp from a clone of Eucalyptus grandis, at age 4 years approximately, planted in three different soils, two of which being low fertility and one being a superior fertility soil, and their refl ections on wood quality and pulping results. Chemical analyses of the soils followed guidelines developed by Raij et al. (2001), while physical and chemical properties of the wood followed ABTCP, TAPPI and ABNT standards. Chemical analyses of the soils pointed to lower fertility in Fazenda Limeira and Fazenda Tapera Queimada as opposed to higher fertility in Fazenda Mendes União. Results revealed stronger tendencies for the stand grown in the less fertile soils (Fazenda Limeira and Fazenda Tapera Queimada) in comparison to the stand grown in more fertile soil (Fazenda Mendes União) as to: higher wood and bark basic density, lower height and dry matter content, higher bark content, lower extractives content and higher holocellulose content, higher total and screened yields from pulping, lower specifi c wood consumption/t of pulp, and higher tear and tensile indices at low refi ning levels.Key words: Soil fertility, wood properties, Kraft pulp. QUALIDADE DA MADEIRA E DA CELULOSE DE UM CLONE DE Eucalyptus grandis PLANTADO EM TRÊS LOCAIS RESUMO: O Eucalyptus grandis é uma das espécies que mais se destacam como matéria prima para produção de polpa no Brasil, pois oferece excelentes resultados da polpação, branqueamento e fabricação de papel. Objetivou-se, com o presente trabalho, estudar a qualidade da madeira e da celulose de um clone de Eucalyptus grandis, com aproximadamente 4 anos, plantado em três solos diferentes, sendo dois solos de baixa fertilidade e um solo de fertilidade superior, e seus refl exos na qualidade da madeira e resultados da polpação. As análises químicas dos solos foram realizadas segundo as normas preconizadas por Raij et al. (2001) e as caracterizações físicas e químicas da madeira foram realizadas de acordo com as normas da ABTCP, TAPPI e ABNT. As análises químicas dos solos mostraram menores fertilidades para as Fazendas Limeira e Tapera

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

“…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).…”

Heartwood, sapwood and bark variation in coppiced <i>Eucalyptus globulus</i> trees in 2nd rotation and comparison with the single-stem 1st rotation

“…A few studies made on 7 and 11-year-old E. globulus trees indicated mean values of 15.2% of bark content (Ramírez et al 2009;Miranda et al 2012). Sansígolo and Ramos (2011) referred values between 13.6% and 15.9% in 4-year-old Eucalyptus grandis, and De Jesus et al (1988) reported 10-12% for Eucalyptus urophylla Blake at 4 years of age. In all cases, the proportion of bark in eucalypt trees is substantial and allows considering a valorization of this biomass residue, e.g.…”

Kraft pulp and chemical properties of Cecropia palmata wood

“…Low basic density and holocellulose content and high lignin and total extractives contents reduce wood pulping yield and increase the rejects produced during pulping (Magaton et al 2009, Sansígolo & Ramos 2011, Santos et al 2012. Thus, as seen in Table 1, the higher total extractives content of C. palmata compared with E. grandis wood can explain its lower pulp yield and reject rate obtained during pulping process.…”

“…In general, the heterogeneity of wood causes a great deal of inconvenience mainly to the furniture, wood and pulp and paper industries. Chemical, physical and anatomical variations in the wood change the yield and quality of the pulp and the paper (Forsström et al 2005, Sansígolo & Ramos 2011, Santos et al 2012, Severo et al 2013. Variations in pulp properties of low and high density woods are due to fibre coarseness (Santos & Sansígolo 2007, Magaton et al 2009).…”