The influence of microwave heating on the mechanical properties of wood

Oloyede, Adekunle; Groombridge, Paul

doi:10.1016/s0924-0136(99)00454-9

Cited by 77 publications

(73 citation statements)

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“…This is because the microwave heating required a shorter time to heat the samples from about 180% MC (after impregnation) to 80% MC (target). This was similar to the findings of Oloyede and Groombridge (2000), who concluded that a microwave drying process provided a faster drying time than conventional oven drying and air drying. Microwave drying can also save about 80% of the drying time of air oven drying (Zhou and Du 2007).…”

Section: Heating Timesupporting

confidence: 90%

Effect of Combination Oven and Microwave Heating in the Resin Semi-Curing Process on the Physical Properties of ‘Compreg’ OPW

Khairunnisha¹,

Bakar²,

Azwa³

et al. 2014

BioResources

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Oil palm wood (OPW) is still difficult to utilize efficiently due to its low strength, low durability, low dimensional stability, and poor machinability. This study was conducted to investigate semi-curing of OPW with lowmolecular weight phenol formaldehyde (Lmw-PF) by a combination of oven and microwave heating. Four main processes in a modified compreg method were used, i.e. drying, impregnation, resin semi-curing heating, and hot-pressing densification. Heating type had a significant effect on the physical properties of treated OPW. The combination of the heating methods used a much shorter time compared to heating by oven only, where over 24 to 30 h were needed to dry the treated OPW.

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Section: Heating Timesupporting

confidence: 90%

Effect of Combination Oven and Microwave Heating in the Resin Semi-Curing Process on the Physical Properties of ‘Compreg’ OPW

Khairunnisha¹,

Bakar²,

Azwa³

et al. 2014

BioResources

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“…The application of microwaves (MW) to wood has been widely studied (Oloyede and Groombridge 2000, Leiker and Aurich 2003, Hanson 2007, Torgovnikov and Vinden 2010 for drying (Antti 1999, Leiker and Adamska 2004, Resch 2006, increasing permeability (Mollekopf and Wagenfür 2002) or improving wood properties for pulping (Torgovnikov and Vinden 2009). …”

Section: Introductionmentioning

confidence: 99%

Effect of microwave treatment on the impregnability and mechanical properties of Eucalyptus globulus wood

Hermoso

Vega

2016

Maderas, Cienc. tecnol.

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Application of microwave energy to wood can increase permeability in order to improve the impregnation of treatments, particularly important in refractory species such as eucalyptus. However, microwave treatment can also affect the physical and mechanical properties of wood. This paper discusses the application of microwave treatments of different intensities to improve impregnability (uptake and retention) and examines the effects on the mechanical properties of eucalyptus wood (Eucalyptus globulus). Microwave treatments significantly improve uptake and retention of the protective agent, especially in the most severe treatment. In contrast, there was a clear decrease in mechanical properties (modulus of elasticity and bending, compression, tension and shear strength) as a function on the energy applied. The effect of microwaves on the properties of wood varies depending on moisture content at the time of treatment.

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“…Moreover, the lower pressure cannot cause water boiling at the surface region; consequently, the boiling must have started at the sample's core and not at the periphery. Other authors also mentioned lower pressure effects using atmospheric pressure conditions in the surrounding during thermal treatments (Perré and Turner 2002;Oloyede and Groombridge 2000;Pang et al 1995). This phenomenon is explained by the evacuation of water from the pores by capillarity action.…”

Section: Discussionmentioning

confidence: 99%

Evolution of Temperature and Moisture Profiles of Wood Exposed to Infrared Radiation

Cserta¹,

Hegedűs²,

Németh³

2012

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In this article we studied the mechanism of wood drying using infrared (IR) heat transfer. Norway spruce (Picea abies (L.) Karst.) samples of 50 mm and 200 mm thickness were exposed to IR radiation, and the temperature and moisture profiles were recorded at the surface and at the core of the samples under controlled experimental conditions. It is proposed that the moisture transport in wood during drying is governed by osmotic effects. Based on such a hypothesis, the temperature stagnation was explained by a lower localized pressure at the core, which reduced the boiling point temperature of water. As moisture is drawn away due to osmosis from the central region, it cannot fill the empty lumens again; therefore, the pressure decreases locally. The evaporation of the internal moisture is brought about by a partial vacuum resulting in the disappearance of the liquid water.

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The influence of microwave heating on the mechanical properties of wood

Cited by 77 publications

References 1 publication

Effect of Combination Oven and Microwave Heating in the Resin Semi-Curing Process on the Physical Properties of ‘Compreg’ OPW

Effect of Combination Oven and Microwave Heating in the Resin Semi-Curing Process on the Physical Properties of ‘Compreg’ OPW

Effect of microwave treatment on the impregnability and mechanical properties of Eucalyptus globulus wood

Evolution of Temperature and Moisture Profiles of Wood Exposed to Infrared Radiation

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