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Relações entre dimensões de fibras e de densidade da madeira ao longo do tronco de Eucalyptus urograndis

2014; Editora da Universidade de São Paulo; Volume: 42; Issue: 101 Linguagem: Inglês

2318-1222

Joaquim Carlos Gonçalez, Gleidson Leitão dos Santos, Francides Gomes da Silva Júnior, Ildeu Soares Martins, Julia de Almeida Costa,

Wood Treatment and Properties

The basic raw material in the Brazilian pulp and paper industry is Eucalyptus wood. The variation in the anatomical wood constituents, especially in fiber affects the quality of pulp to be produced. This study aimed to characterize Eucalyptus urograndis anatomy and fiber density, checking the variation of these parameters along the stem of trees, from a plantation in the Federal District region, for its use in the pulp industry. For this research we used wood from five trees of Eucalyptus urograndis, aged 8 years. Five disks of approximately, 3.0 cm thickness were taken from each plant. Each disk corresponded to a especific position on the trunk: 0% (base), 25%, 50%, 75% and 100% of the commercial height. The measured fiber dimensions in fixed positions of the stem were: length, width, thickness and lumen diameter and specific gravity. The results show that the fibers have a mean size of 0.90 mm in length, are 16.51 μm wide and 5.61 μm thick. The length of wood fibers has tended to be greater on the tip of the stem. The average basic density was 0.510 g/cm3. There was also a tendency for higher density on the upper part of the stem. The above variables contribute to the characterization of the timber and must be taken into account for optimizing pulp production.