Publicação
Avaliação das características dos cepos e raízes de Eucalypto como matéria-prima papeleira
| dc.contributor.advisor | Pereira, Helena Margarida Nunes | |
| dc.contributor.advisor | Gominho, Jorge | |
| dc.contributor.author | Lopes, Cátia Sofia dos Santos | |
| dc.date.accessioned | 2013-03-15T10:02:50Z | |
| dc.date.available | 2013-03-15T10:02:50Z | |
| dc.date.issued | 2012 | |
| dc.description | Mestrado em Engenharia Florestal e dos Recursos Naturais - Instituto Superior de Agronomia | por |
| dc.description.abstract | 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%). | por |
| dc.identifier.citation | Lopes, C.S.S. - Avaliação das características dos cepos e raízes de Eucalypto como matéria-prima papeleira. Lisboa: ISA, 2012, 70 p. | por |
| dc.identifier.uri | http://hdl.handle.net/10400.5/5361 | |
| dc.language.iso | por | por |
| dc.publisher | ISA/UTL | por |
| dc.subject | Eucalyptus globulus | por |
| dc.subject | kraft | por |
| dc.subject | ASAM | por |
| dc.subject | auto-hydrolysis | por |
| dc.subject | extraction | por |
| dc.subject | roots and stumps | por |
| dc.title | Avaliação das características dos cepos e raízes de Eucalypto como matéria-prima papeleira | por |
| dc.type | master thesis | |
| dspace.entity.type | Publication | |
| rcaap.rights | OpenAccess | por |
| rcaap.type | masterThesis | por |
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