Journal: Wood Material Science & Engineering

Abbreviation

Wood Mater. Sci. Eng.

Publisher

Taylor & Francis

Journal Volumes

ISSN

1748-0272
1748-0280

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Publications 1 - 10 of 20
  • Critical wood-particle properties in the production of particleboard
    Item type: Journal Article
    Niemz, Peter; Sandberg, Dick (2022)
    Wood Material Science & Engineering
    Particleboard is an important base-material in furniture and building applications and its annual production capacity worldwide is over 100 million m(3). Wood is the main raw material used, although the feasibility of non-wood alternatives exists. This technical note summarises information about how wood-particle geometry affects the bulk density and mat density, two important parameters in the particleboard production.
  • An engineering approach for calculating the energy required for defrosting and subsequent heating of frozen wood during thermal treatment
    Item type: Journal Article
    Deliiski, Nencho; Niemz, Peter; Angelski, Dimitar; et al. (2024)
    Wood Material Science & Engineering
    An approach for calculating the energy required for defrosting and subsequent heating of frozen wood during thermal treatment in the production of veneer has been presented. Using two own unsteady models the duration of regimes for steaming of prisms in an autoclave and for boiling of logs in a pit, and also the average mass temperature of the prisms and logs and the energy accumulated by them at the end of heat carrier introduction in these regimes was determined. The obtained values of average temperature were introduced in third own model for engineering calculation of the energy considered in the approach. Computer simulations were carried out for beech prisms with a cross section of 0.4 × 0.4 m and beech logs with a diameter of 0.4 m at an initial wood temperature of −10°C, −20°C, and −30°C and moisture content of 0.6 kg·kg−1. The operating temperature of the prism steaming regimes was equal to 130°C, and that of the log boiling regimes was 80°C. The approach can be applied using Excel for computing the energy and its components needed for defrosting and heating of different frozen capillary-porous materials subjected to multiple types of thermal treatment.
  • Lateral stiffening systems for tall timber buildings – tube-in-tube systems
    Item type: Journal Article
    Binck, Charles; Cao, Alex Sixie; Frangi, Andrea (2022)
    Wood Material Science & Engineering
    In this paper, an adaptable and architecturally flexible lateral stiffening system for tall timber buildings between 50 and 147 m is developed and investigated. The system is based on a tube-in-tube concept. The internal tube consists of a braced timber core, and the external tube consists of a frame structure with semi-rigid beam-column joints in the facade. Based on a finite element framework, more than 500 000 simulations with different configurations are carried out to assess the performance of the lateral stiffening system subjected to wind loading. The resulting data is used to assess the feasibility of the tube-in-tube system and stiffness requirements for the beam-column joints.
  • Water uptake and permeability in sapwood and heartwood of hydro-thermally proceed Turkey oak
    Item type: Journal Article
    Rezaei, Fatemeh; Corleto, Roberto; Giudice, Valentina Lo; et al. (2024)
    Wood Material Science & Engineering
    This study aimed to investigate the combined effect of steaming and heating on the equilibrium moisture content (EMC) of Turkey oak (Quercus cerris L.) wood over a nine-year period. The study also aimed to determine the impact of steaming on water absorption and water permeability, crucial for the durability of the species against environmental factors. The specimens underwent thermal modification with and without steaming, then were stored under laboratory conditions for ten years. The mass of the specimens was monitored throughout the ten-year period. To measure the water uptake capacity, the specimens were soaked in water for 120 hours. The water permeability of the specimens was assessed using a pressurised chamber. The results showed that the moisture content of thermally-modified oak was constant under laboratory conditions after nine years, further improved by steam treatment. The research also revealed that the steamed wood absorbed more water during water submersion compared to the unmodified wood. When the steaming treatment was applied, there was a significant increase in permeability in the sapwood compared to the heartwood, due to anatomical variations. Despite this, statistical noise, and material variability, alongside tylosis presence, underline the need for examining more specimens in future studies.
  • Selected physical and mechanical properties of the Chilean wood species roble, lingue, manio and alerce
    Item type: Journal Article
    Sonderegger, Walter; Keunecke, Daniel; Baradit, Erik; et al. (2010)
    Wood Material Science & Engineering
  • Orthotropic hygric and mechanical material properties of oak wood
    Item type: Journal Article
    Ozyhar, Tomasz; Mohl, Leander; Hering, Stefan; et al. (2016)
    Wood Material Science & Engineering
  • Computing the duration of regimes for autoclave steaming of frozen wooden prisms under variable operating conditions in veneer production
    Item type: Journal Article
    Deliiski, Nencho; Niemz, Peter; Vitchev, Pavlin; et al. (2022)
    Wood Material Science & Engineering
    An approach for calculation of the duration of regimes for intensive autoclave steaming of frozen wooden prisms in cases of dispatching interferences into the operating temperatures has been suggested. The approach is based on the use of two coupled personal mathematical models: a 2D non-linear model of the unsteady distribution of the temperature in frozen and non-frozen prismatic wood materials subjected to steaming and a model of the non-stationary thermal balance of autoclaves for steaming wood materials. Using the suggested approach, calculation of the duration of regimes for defrosting and heating of beech prisms have been carried out. The variables were an initial wood temperature of -20 degrees C, moisture content of 0.6 kg.kg(-1), and cross-section dimensions of the prisms 0.4 x 0.4 m; steaming autoclave with a diameter of 2. 4 m, length of 9.0 m, and loading level of 50% for the cases of lowering by the dispatcher the maximum temperature of the basic steaming regime from 130 degrees C to 120, 110, and 100 degrees C in the 3rd, 7th, and 11th hour of these regimes. The approach can be applied for developing optimized energy-efficient regimes for autoclave steaming of frozen wood materials with desired duration set by the dispatcher.
  • Anatomical and morphological characteristics of beech wood after CO2-laser cutting
    Item type: Journal Article
    Rezaei, Fatemeh; Wimmer, Rupert; Gaff, Milan; et al. (2022)
    Wood Material Science & Engineering
    This study aimed to characterize the surface quality of beech wood (Fagus sylvatica L.) cut by a CO2-laser. Boards were conditioned to a low (about 8% moisture content), 12% and a high, (about 18% moisture content). Laser cutting was performed at varying processing parameters, i.e. cutting speed, gas pressure and focal-point position. A confocal microscope was used to determine the average surface roughness perpendicular to the grain. The anatomical structures of the laser-cut surfaces were examined with scanning electron microscope. The result showed that smoother surfaces were obtained at the low moisture content when processed at a gas pressure of 21 bar. Focal-point positioning did only have an effect on the surface roughness at 12% moisture content whereas the value was substantially lower for focal-point positioned on the surface. The surfaces cut at 18% moisture content, and at a cutting speed of 3.5 m/min generated a rougher surface than cut at low moisture content and at a lower speed. Laser cutting produced a rougher surface as compared to sawn surface (circular saw). The structural integrity of the laser-cut surface was more intact when the wood was having high moisture content and processed at a high cutting speed.
  • Influence of growth ring angle, adhesive system and viscosity on the shear strength of adhesive bonds
    Item type: Journal Article
    Hass, Philipp; Müller, Christian; Clauss, Sebastian; et al. (2009)
    Wood Material Science & Engineering
  • Stiffness moduli of various softwood and hardwood species determined with ultrasound
    Item type: Journal Article
    Keunecke, Daniel; Merz, Tobias; Sonderegger, Walter; et al. (2011)
    Wood Material Science & Engineering
Publications 1 - 10 of 20