Microwave Treatments and Their Effects on Selected Properties of Portuguese <i>Pinus pinaster</i> Aiton. and <i>Eucalyptus globulus</i> Labill. Wood
The most widespread wood species in the Portuguese forest and the most widely utilized are maritime pine (<i>Pinus pinaster</i>) and eucalyptus (<i>Eucalyptus globulus</i> Labill). In the case of eucalyptus, except for the pulping sector, it might have limited usage due to dr...
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MDPI AG
2023-08-01
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| Series: | Forests |
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| Online Access: | https://www.mdpi.com/1999-4907/14/8/1671 |
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| author | Fernando Júnior Resende Mascarenhas Alfredo Manuel Pereira Geraldes Dias André Luis Christoforo Rogério Manuel dos Santos Simões André Eduardo Palos Cunha |
| author_facet | Fernando Júnior Resende Mascarenhas Alfredo Manuel Pereira Geraldes Dias André Luis Christoforo Rogério Manuel dos Santos Simões André Eduardo Palos Cunha |
| author_sort | Fernando Júnior Resende Mascarenhas |
| collection | DOAJ |
| description | The most widespread wood species in the Portuguese forest and the most widely utilized are maritime pine (<i>Pinus pinaster</i>) and eucalyptus (<i>Eucalyptus globulus</i> Labill). In the case of eucalyptus, except for the pulping sector, it might have limited usage due to drying issues and low permeability. Microwave (MW) treatment is a technology that has been used to improve wood species’ permeability. Therefore, the present paper aimed to evaluate the MW treatment of both Portuguese wood species and to investigate the effects of different MW treatments on wood’s density, water uptake capability, modulus of rupture (MOR), and modulus of elasticity (MOE). Using small clear wood specimens, two MW powers were used, 700 and 1200 W, and the samples were submitted to successive MW cycles of 2 min till they reached the required dryness. The results showed that each wood species had a different behavior during the MW drying in terms of drying rate, supply, and consumption of energy. In general, with the increase in MW power, the densities of both species decreased and the water uptake increased, as a possible indicator that a certain level of microstructural damage might have occurred. Regarding the mechanical properties of MW-treated maritime pine and eucalyptus wood specimens, under the harshest conditions (MW power of 1200 W), MOR and MOE were reduced compared with the wood sample without MW treatment. |
| first_indexed | 2024-03-10T23:56:25Z |
| format | Article |
| id | doaj.art-90784e6152fd4ea282d8476249a89230 |
| institution | Directory Open Access Journal |
| issn | 1999-4907 |
| language | English |
| last_indexed | 2024-03-10T23:56:25Z |
| publishDate | 2023-08-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Forests |
| spelling | doaj.art-90784e6152fd4ea282d8476249a892302023-11-19T01:10:26ZengMDPI AGForests1999-49072023-08-01148167110.3390/f14081671Microwave Treatments and Their Effects on Selected Properties of Portuguese <i>Pinus pinaster</i> Aiton. and <i>Eucalyptus globulus</i> Labill. WoodFernando Júnior Resende Mascarenhas0Alfredo Manuel Pereira Geraldes Dias1André Luis Christoforo2Rogério Manuel dos Santos Simões3André Eduardo Palos Cunha4ISISE, Department of Civil Engineering, Rua Luís Reis Santos—Pólo II, University of Coimbra (UC), 3030-788 Coimbra, PortugalISISE, Department of Civil Engineering, Rua Luís Reis Santos—Pólo II, University of Coimbra (UC), 3030-788 Coimbra, PortugalDepartment of Civil Engineering, Federal University of São Carlos (UFSCar), Rodovia Washington Luís (SP-310), Km 235, São Carlos 13565-905, BrazilUnit of Fiber Materials and Environmental Technologies (FibEnTech-UBI), Department of Chemistry, University Beira Interior (UBI), 6201-001 Covilhã, PortugalUnit of Fiber Materials and Environmental Technologies (FibEnTech-UBI), Department of Chemistry, University Beira Interior (UBI), 6201-001 Covilhã, PortugalThe most widespread wood species in the Portuguese forest and the most widely utilized are maritime pine (<i>Pinus pinaster</i>) and eucalyptus (<i>Eucalyptus globulus</i> Labill). In the case of eucalyptus, except for the pulping sector, it might have limited usage due to drying issues and low permeability. Microwave (MW) treatment is a technology that has been used to improve wood species’ permeability. Therefore, the present paper aimed to evaluate the MW treatment of both Portuguese wood species and to investigate the effects of different MW treatments on wood’s density, water uptake capability, modulus of rupture (MOR), and modulus of elasticity (MOE). Using small clear wood specimens, two MW powers were used, 700 and 1200 W, and the samples were submitted to successive MW cycles of 2 min till they reached the required dryness. The results showed that each wood species had a different behavior during the MW drying in terms of drying rate, supply, and consumption of energy. In general, with the increase in MW power, the densities of both species decreased and the water uptake increased, as a possible indicator that a certain level of microstructural damage might have occurred. Regarding the mechanical properties of MW-treated maritime pine and eucalyptus wood specimens, under the harshest conditions (MW power of 1200 W), MOR and MOE were reduced compared with the wood sample without MW treatment.https://www.mdpi.com/1999-4907/14/8/1671microwave drying<i>Pinus pinaster</i><i>Eucalyptus globulus</i>modulus of rupturemodulus of elasticity |
| spellingShingle | Fernando Júnior Resende Mascarenhas Alfredo Manuel Pereira Geraldes Dias André Luis Christoforo Rogério Manuel dos Santos Simões André Eduardo Palos Cunha Microwave Treatments and Their Effects on Selected Properties of Portuguese <i>Pinus pinaster</i> Aiton. and <i>Eucalyptus globulus</i> Labill. Wood Forests microwave drying <i>Pinus pinaster</i> <i>Eucalyptus globulus</i> modulus of rupture modulus of elasticity |
| title | Microwave Treatments and Their Effects on Selected Properties of Portuguese <i>Pinus pinaster</i> Aiton. and <i>Eucalyptus globulus</i> Labill. Wood |
| title_full | Microwave Treatments and Their Effects on Selected Properties of Portuguese <i>Pinus pinaster</i> Aiton. and <i>Eucalyptus globulus</i> Labill. Wood |
| title_fullStr | Microwave Treatments and Their Effects on Selected Properties of Portuguese <i>Pinus pinaster</i> Aiton. and <i>Eucalyptus globulus</i> Labill. Wood |
| title_full_unstemmed | Microwave Treatments and Their Effects on Selected Properties of Portuguese <i>Pinus pinaster</i> Aiton. and <i>Eucalyptus globulus</i> Labill. Wood |
| title_short | Microwave Treatments and Their Effects on Selected Properties of Portuguese <i>Pinus pinaster</i> Aiton. and <i>Eucalyptus globulus</i> Labill. Wood |
| title_sort | microwave treatments and their effects on selected properties of portuguese i pinus pinaster i aiton and i eucalyptus globulus i labill wood |
| topic | microwave drying <i>Pinus pinaster</i> <i>Eucalyptus globulus</i> modulus of rupture modulus of elasticity |
| url | https://www.mdpi.com/1999-4907/14/8/1671 |
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