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Effect of moisture on physical parameters of timber from Turkey oak (Quercus cerris L.) coppice in Central Italy

Forestry Studies in China 2011年第4期13卷 276-284页

作者： Angela LO MONACO luigi todaro Mara SARLATTO Raffaello SPINA Luca CALIENNO Rodolfo PICCHIO Department of Science and Technology for Agriculture Forests Nature and Energy University of Tuscia Department of Crop Systems Forestry and Environmental Sciences University of Basilicata Agricultural Research Council

This study aims to investigate wood density at different levels of moisture, basic density and shrinkage of timber from Turkey oak （Quercus cerris L.） coppice forests growing in Central Italy. We also studied the variability in density in the trees within and among sites. Density shows no significant statistical differences in the tested population. A higher variability in the shrinkage than in the density was found. Wood moisture is referred to as dry mass and fresh mass, which is related to many performance characteristics of wood, i.e., energy production. Trends in moisture and water content were studied because these physical parameters play an important role in the specific area of firewood which requires an accurate estimation of mass, volume and energy content. This work is a contribution to improve xylo-energy estimates of small and medium forestry issues.

关键词： wood density coppice moisture content Quercus cerris L. shrinkage

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The Characteristics of Glued Tensile Shear Strength Constituted of Wood Cut by CO_(2) Laser

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Journal of Renewable Materials 2023年第8期11卷 3277-3296页

作者： Fatemeh Rezaei Milan Gaff Róbert Nemeth Jerzy Smardzewski Peter Niemz Haitao Li Anil Kumar Sethy luigi todaro Gourav Kamboj Sumanta Das Roberto Corleto Gianluca Ditommaso Miklós Bak Department of Wood Processing Faculty of Forestry and Wood SciencesCzech University of Life Sciences PraguePrague16521Czech Republic Department of Wood Science and Engineering Oregon State UniversityCorvallisORUSA Department of Furniture Design and Habitat BrnoMendel University in BrnoBrno61300Czech Republic Experimental Centre Faculty of Civil EngineeringCzech Technical University in PraguePrague16629Czech Republic Institute of Wood Technology and Technical Sciences University of SopronSopron9400Hungary Department of Furniture Design Faculty of Forestry and Wood TechnologyPoznan University of Life SciencesPoznan60637Poland ETH Zurich Institute for Building MaterialsLulea University of TechnologyZurichCH8093Switzerland School of Civil Engineering Nanjing Forestry UniversityNanjingChina Joint International Research Laboratory of Bio-Composite BuildingMaterials and Structures Nanjing Forestry UniversityNanjingChina Wood Properties and Processing Institute of Wood Science and TechnologyBangalore560003India School of Agricultural Forestry Foodand Environmental ScienceUniversity of BasilicataPotenza85100Italy

The performance of engineered wood products is highly associated with proper bonding and an efﬁcient cutting *** paper investigates the inﬂuence of CO_(2) laser cutting on the wetting properties,the modiﬁed che-mical component of the laser-cut surface,and the strength and adhesive penetration near the ***-wood is cut by the laser with varying processing parameters,cutting speeds,gas pressures,and focal point *** laser-cut samples were divided into two groups,sanded and non-sanded *** acetate adhesive(PVAc)was used to bond the groups of laser-cut *** assembly with cold pressing,the tensile shear test was carried *** modelling was carried out to determine the partial elongation and shear strain of the glue *** on this,the shear modulus and linear elasticity of the glue line were ***-ning electron microscopy was used to assess the adhesive penetration into the porosity structure of the laser-cut samples,and the depth of the heat-affected *** laser-cut surface was analysed by Fourier transform infrared *** wetting properties of the laser-cut surface were investigated by using a contact angle *** numerical model of the strain-stress curve conﬁrmed the experimental *** highest modulus of the linear elasticity of the glue in the numerical calculation belongs to the joint containing laser-cut samples at a gas pressure of 21(bar).The penetration depth of PVAc adhesive into the porosity structure of the laser-cut sam-ples was similar to that of sawn *** deepest heat-affected zone in the laser-cut samples was 150µm.A PVAc drop disappeared immediately on the laser-cut surface without sanding,but gradually on the sanded *** contrast,the drop on the sawn surface remained with an angle of 32°–48°.The degradation of hemi-cellulose and lignin was proven by the lower intensity of the C=O and C-O Bonds,compared to the sawn surface.

关键词： CO_(2)laser cutting speed focal point position gas pressure glued tensile shear strength

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