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Publicação
Avaliação das características dos cepos e raízes de Eucalypto como matéria-prima papeleira
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Autores
Orientador(es)
Resumo(s)
In this study we used stumps and roots of Eucalyptus globulus Labill., from six places, to evaluated
its quality as raw-material for papermaking, using two chemical processes: Kraft and ASAM. It was
also evaluated the introduction of two pre-treatments: a) extraction with ethanol and water, b)
water to promote auto-hydrolysis. It was determined yields of the pulps were the material
without pre-treatment presented 42.7% (Kraft) and 49.3% (ASAM); extracted wood 47.5% (Kraft)
and 51.7% (ASAM); auto-hydrolyzed material 38.4% (Kraft) and 42.5% (ASAM).
It also determined the Kappa number, the degree of polymerization and brightness. Pulps without
pre-treatment presented values of (ASAM and Kraft, respectively): 14 K and 36 K, 941 DP0,85 and
929 DP0,85; 25.9% and 23.6% of brightness. For pulps obtained with extracted wood: 11 K and 18
K; 845 DP0,85 and 1004 DP0,85; 30.8% and 35.8% of brightness. For pulps from auto-hydrolyzed
materials: 14 K and 20 K; 552 DP0,85 and 574 DP0,85; 27.1% and 28.7% of brightness.
There has also been done biometric studies and was obtained the following average results:
average length 0.9 mm, a fiber width of 21.4 μm and lumen widths of 9.0 μm. It was determined
the index evaluation of paper, based on biometric parameters: number of Runkel (1.4), felting
coefficient (43.7) and soupless coefficient (42.5%).
Descrição
Mestrado em Engenharia Florestal e dos Recursos Naturais - Instituto Superior de Agronomia
Palavras-chave
Eucalyptus globulus kraft ASAM auto-hydrolysis extraction roots and stumps
Contexto Educativo
Citação
Lopes, C.S.S. - Avaliação das características dos cepos e raízes de Eucalypto como matéria-prima papeleira. Lisboa: ISA, 2012, 70 p.