Change search
Refine search result
1 - 20 of 20
CiteExportLink to result list
Permanent link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Rows per page
  • 5
  • 10
  • 20
  • 50
  • 100
  • 250
Sort
  • Standard (Relevance)
  • Author A-Ö
  • Author Ö-A
  • Title A-Ö
  • Title Ö-A
  • Publication type A-Ö
  • Publication type Ö-A
  • Issued (Oldest first)
  • Issued (Newest first)
  • Created (Oldest first)
  • Created (Newest first)
  • Last updated (Oldest first)
  • Last updated (Newest first)
  • Disputation date (earliest first)
  • Disputation date (latest first)
  • Standard (Relevance)
  • Author A-Ö
  • Author Ö-A
  • Title A-Ö
  • Title Ö-A
  • Publication type A-Ö
  • Publication type Ö-A
  • Issued (Oldest first)
  • Issued (Newest first)
  • Created (Oldest first)
  • Created (Newest first)
  • Last updated (Oldest first)
  • Last updated (Newest first)
  • Disputation date (earliest first)
  • Disputation date (latest first)
Select
The maximal number of hits you can export is 250. When you want to export more records please use the Create feeds function.
  • 1.
    Bekhta, Pavlo
    et al.
    Ukrainian National Forestry University, Ukraine.
    Sedliacik, Jan
    Technical University in Zvolen, Slovakia.
    Jones, Dennis
    RISE - Research Institutes of Sweden (2017-2019), Built Environment, Building Technology.
    Effect of short-term thermomechanical densification of wood veneers on the properties of birch plywood2017In: European Journal of Wood and Wood Products, ISSN 0018-3768, E-ISSN 1436-736X, Vol. 76, no 2, p. 549-562Article in journal (Refereed)
    Abstract [en]

    In this study, the physical and mechanical properties of plywood panels made from pre-compressed birch (Betula verrucosa Ehrh.) veneer were evaluated. Veneer sheets underwent short-term thermo-mechanical (STTM) compression at temperatures of 150 or 180 °C and at pressures of 0.5, 1.0, 1.5, 2.0, 2.5, 3.0 or 3.5 MPa for a period of 1 min prior to adhesive being applied and pressed into panels using phenol formaldehyde adhesive at 100 g/m2 spread rate; this was one-third less than the adhesive spread used for the control panels (150 g/m2). The pressing pressure was 1.0 MPa, which was almost half of the pressure used for the control panels (1.8 MPa); and pressing time was 3 min, also half of the pressing time used for the control panels (6 min). The results showed that surface roughness of compressed veneer, water absorption and thickness swelling of plywood panels made from compressed veneer were significantly improved. The shear strength values of plywood panels made from compressed birch veneer even with reduced adhesive spread were higher than those of plywood panels made from uncompressed veneer. The findings in this study indicated that compression of birch veneer could be considered as an alternative to produce more eco-friendly (owing to smaller adhesive spread) value-added material with enhanced properties.

  • 2.
    Berglund, Anders
    et al.
    Luleå University of Technology, Sweden.
    Johansson, Erik
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Förädling och processer (TRf). Luleå University of Technology, Sweden.
    Skog, Johan
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Hållbar Samhällsbyggnad. Luleå University of Technology, Sweden.
    Value optimized log rotation for strength graded boards using computed tomography2014In: European Journal of Wood and Wood Products, ISSN 0018-3768, E-ISSN 1436-736X, Vol. 72, no 5, p. 635-642Article in journal (Refereed)
    Abstract [en]

    A possible application for an industrial computed tomography scanner in a sawmill is finding an optimal rotational position of logs with respect to knots and outer shape. Since a computed tomography scanner is a great investment, it is important to investigate potential profitability of such an investment for different production strategies. The objective of this study was to investigate the potential value increase of the sawn timber of Norway spruce (Picea abies (L.) Karst.) by rotating logs to their optimum position prior to sawing compared with sawing all logs in horns down position. The production strategy evaluated by log breakdown simulation in this case study was to produce strength graded timber of the center boards, while the side boards were appearance graded. This case study showed an average value increase with respect to the value of center boards, side boards and chips of 11 %.

  • 3.
    Couceiro, José
    et al.
    Luleå University of Technology, Sweden.
    Hansson, Lars
    NTNU Norwegian University of Science and Technology, Norway.
    Sehlstedt-Persson, Margot
    Luleå University of Technology, Sweden.
    Vikberg, Tommy
    RISE Research Institutes of Sweden, Built Environment, Building and Real Estate.
    Sandberg, Dick
    Luleå University of Technology, Sweden.
    The conditioning regime in industrial drying of Scots pine sawn timber studied by X-ray computed tomography: a case-study2020In: European Journal of Wood and Wood Products, ISSN 0018-3768, E-ISSN 1436-736X, Vol. 78, no 4, p. 673-682Article in journal (Refereed)
    Abstract [en]

    Industrial drying of sawn timber is a process driven by a difference in moisture content (MC) between the core and the surface as moisture moves from the wet inner region towards the drier surface. After drying, the timber surface is always drier than its core, and stresses have developed within the wood volume. If the timber is to be further processed, these stresses and the moisture gradient need to be reduced to avoid unwanted distortion, i.e. the timber needs to be conditioned. Conditioning is usually accomplished by exposing the timber to a hot and humid climate after the drying regime. The conditioning regime is essential for timber quality, and it is energy and time consuming; therefore of interest for optimisation. This research was a case study where for the first time the MC during conditioning was studied in an X-ray computed tomography (CT) scanner. The aim was to test a previously developed algorithm and investigate the influence of MC and heartwood-sapwood proportion on the effectivity of the moisture equalisation in 30 mm thick Scots pine boards. The MC was estimated from CT data acquired during the drying and conditioning of the boards in a lab-scale kiln adapted to a medical CT scanner. Results show that the algorithm can provide relevant data of internal MC distribution of sawn timber at the pixel level. Furthermore, for the drying schedules studied, the conditioning at low MC (8%) does not need to be longer than 3 h, while higher MC (18%) requires a longer conditioning.

    Download full text (pdf)
    fulltext
  • 4.
    Hu, Min
    et al.
    Linnaeus University, Sweden.
    Johansson, Marie
    Linnaeus University, Sweden.
    Olsson, Anders
    Linnaeus University, Sweden.
    Oscarsson, Jan
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Hållbar Samhällsbyggnad.
    Enquist, Bertil
    Linnaeus University, Sweden.
    Local variation of modulus of elasticity in timber determined on the basis of non-contact deformation measurement and scanned fibre orientation2014In: European Journal of Wood and Wood Products, ISSN 0018-3768, E-ISSN 1436-736X, Vol. 73, no 1, p. 17-27Article in journal (Refereed)
    Abstract [en]

    During the last decade, the utilization of non-contact deformation measurement systems based on digital image correlation (DIC) has increased in wood related research. By measuring deformations with DIC systems, surface strain fields can be calculated. The first aim of this study concerns the possibility to detect detailed strain fields along the entire length of a wooden board subjected to pure bending and the potential of using such strain fields to determine a bending modulus of elasticity (MOE) profile along a board. Displacements were measured over 12 subareas along a flat surface of the board. For each such area, a separate local coordinate system was defined. After the transformation of locally measured coordinates to a global system, high resolution strain fields and a corresponding bending MOE profile were calculated. A second method in establishing bending MOE profiles is to use fibre angle information obtained from laser scanning and a calculation model based on integration of bending stiffness over board cross sections. Such profiles have recently been utilized for accurate strength grading. A second aim of this study was to investigate the accuracy of the bending MOE profiles determined using the latter method involving fibre angle information. Bending MOE profiles determined using the two described methods agree rather well. However, for some patterns of knot clusters, the local bending MOE, calculated on the basis of fibre angles and integration of bending stiffness, is overestimated. Hence, this research adds knowledge that may be utilized to improve the newly suggested strength grading method.

  • 5.
    Johansson, Pernilla
    et al.
    RISE - Research Institutes of Sweden (2017-2019), Built Environment, Building Technology.
    Mjörnell, Kristina
    RISE - Research Institutes of Sweden (2017-2019).
    Arfvidsson, J.
    Lund University, Sweden.
    Examples of characteristics of wood that affect mould growth: a meta-analysis2017In: European Journal of Wood and Wood Products, ISSN 0018-3768, E-ISSN 1436-736X, Vol. 75, no 4, p. 603-613Article in journal (Refereed)
    Abstract [en]

    Building materials differ in their susceptibility to mould growth. Wood is a material often considered to have a low mould resistance. However, wood is not a homogenous material and different characteristics of the material are expected to have an impact on mould growth. In this paper, it was shown that wood species (pine or spruce), sawing pattern (centre-board or side-board) and surface structure (planed or sawn) affected mould growth. In addition, it was indicated that the susceptibility cannot be described by one single parameter, but also depends on other parameters. It is therefore difficult to estimate the susceptibility of wood in general. These conclusions were drawn from a meta-analysis, using data from five separate, previously performed laboratory studies conducted at 90% relative humidity and 22 °C, and from a laboratory study performed at 95% RH and 22 °C. © 2016 Springer-Verlag Berlin Heidelberg

  • 6.
    Laine, Kristiina
    et al.
    KTH Royal Institute of Technology, Sweden.
    Segerholm, Kristoffer
    RISE, SP – Sveriges Tekniska Forskningsinstitut. KTH Royal Institute of Technology, Sweden.
    Wålinder, Magnus
    KTH Royal Institute of Technology, Sweden.
    Rautkari, Lauri
    Aalto University, Finland.
    Hughes, Mark
    Aalto University, Finland.
    Lankveld, Chiel
    Accsys Technologies, Netherlands.
    Surface densification of acetylated wood2016In: European Journal of Wood and Wood Products, ISSN 0018-3768, E-ISSN 1436-736X, Vol. 74, no 6, p. 829-835Article in journal (Refereed)
    Abstract [en]

    The mechanical properties of wood can be improved by compressing its porous structure between heated metal plates. By adjusting the process parameters it is possible to target the densification only in the surface region of wood where the property improvements are mostly needed in applications, such as flooring. The compressed form is, however, sensitive to moisture and will recover to some extent in high humidity. In this study, therefore, acetylated radiata pine was utilised in the surface densification process in order to both reduce the set-recovery of densified wood and to improve the hardness of the acetylated wood. Pre-acetylation was found to significantly reduce the set-recovery of surface densified wood. However, after the second cycle the increase in set-recovery of acetylated wood was relatively higher than the un-acetylated wood. The acetylated samples were compressed by only 1 mm (instead of the target 2 mm), yet, the hardness and hardness recovery of the acetylated samples significantly increased as a result of densification. It was also discovered that rough (un-planed) surfaces may be surface densified, however, even if the surface became smooth to the touch, the appearance remained uneven.

  • 7. Malmquist, Lars
    Lumber drying as a diffusion process1991In: European Journal of Wood and Wood Products, ISSN 0018-3768, E-ISSN 1436-736X, Vol. 49, p. 161-167Article in journal (Refereed)
  • 8.
    Norén, Bengt
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, Trätek..
    Matching of wood for testing purpose1994In: European Journal of Wood and Wood Products, ISSN 0018-3768, E-ISSN 1436-736X, Vol. 52, no 3, p. 191-197Article in journal (Refereed)
    Abstract [en]

    Different methods of pair matching both small "clean" wood specimens and structural timber are described. Matching of structural timber according to modulus of elasticy and knots results in pairs that differ in strength by an average of about 15 percent with extremes up to 40 percent. These differences are due to other parameters such as fibre deviation, number of cut fibres, tension strength perpendicular to grain, whose influence is not sufficiently reflected in the deviation of local stiffness. Här beskrivs olika sätt att tillverka par av likvärdiga provkroppar av trä för hållfasthetsbestämning. "Matchning" av helrent trä och förband ingår, men tyngdpunkten är lagd på matchning av konstruktionsvirke såsom den tillämpats vid Träteks långtidsundersökning av tid till brott som funktion av belastningsgraden.

  • 9.
    Nussbaum, Ralph
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, Trätek..
    Penetration of water-borne alkyd emulsions and solvent-borne alkyds into wood. Autoradiographic and SEM-EDXA studies1994In: European Journal of Wood and Wood Products, ISSN 0018-3768, E-ISSN 1436-736X, Vol. 52, p. 389-393Article in journal (Refereed)
  • 10. Nyrud, Anders Q
    et al.
    Bringslimark, Tina
    Englund, Finn
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP Trä.
    Wood use in a hospital environment: VOC emissions and air quality2012In: European Journal of Wood and Wood Products, ISSN 0018-3768, E-ISSN 1436-736X, Vol. 70, no 4, p. 541-543Article in journal (Refereed)
  • 11. Sjödin, Johan
    et al.
    Enquist, Bertil
    Serrano, Erik
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, Trätek.
    Contact-free measurements and numerical analyses of the strain distribution in the joint area of steel-to-timber dowel joints2006In: European Journal of Wood and Wood Products, ISSN 0018-3768, E-ISSN 1436-736X, Vol. 64, no 6, p. 497-506Article in journal (Refereed)
  • 12. Sjödin, Johan
    et al.
    Johansson, Carl-Johan
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, Trätek.
    Influence of initial moisture induced stresses in multiple steel-to-timber dowel joints2007In: European Journal of Wood and Wood Products, ISSN 0018-3768, E-ISSN 1436-736X, Vol. 65, no 1, p. 71-77Article in journal (Refereed)
  • 13. Sjödin, Johan
    et al.
    Serrano, Erik
    RISE, SP – Sveriges Tekniska Forskningsinstitut.
    A numerical study of methods to predict the capacity of multiple steel-timber dowel joints2008In: European Journal of Wood and Wood Products, ISSN 0018-3768, E-ISSN 1436-736X, Vol. 66, no 6, p. 447-454Article in journal (Refereed)
  • 14. Sjödin, Johan
    et al.
    Serrano, Erik
    RISE, SP – Sveriges Tekniska Forskningsinstitut.
    Enquist, Bertil
    An experimental and numerical study of the effect of friction in single dowel joints2008In: European Journal of Wood and Wood Products, ISSN 0018-3768, E-ISSN 1436-736X, Vol. 66, no 5, p. 363-372Article in journal (Refereed)
  • 15.
    Sterley, Magdalena
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, AB Trätek.
    Blümer, Hartwig
    Wålinder, Magnus
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, AB Trätek.
    Edge and face gluing of green timber using a one-component polyurethane adhesive2004In: European Journal of Wood and Wood Products, ISSN 0018-3768, E-ISSN 1436-736X, Vol. 62, no 6, p. 479-482Article in journal (Refereed)
  • 16.
    Wang, Xiaodong
    et al.
    Luleå University of Technology, Sweden.
    Hagman, Olle
    Luleå University of Technology, Sweden.
    Sundqvist, Bror
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Material och produkter (TRm).
    Ormarsson, Sigurdur
    DTU Technical University of Denmark, Denmark.
    Wan, Hui
    Mississippi State University, USA.
    Niemz, Peter
    ETH Zurich, Switzerland.
    Impact of cold temperatures on the shear strength of Norway spruce joints glued with different adhesives2015In: European Journal of Wood and Wood Products, ISSN 0018-3768, E-ISSN 1436-736X, Vol. 73, no 2, p. 225-233Article in journal (Refereed)
    Abstract [en]

    As wood construction increasingly uses engineered wood products worldwide, concerns arise about the integrity of the wood and adhesives used. Bondline strength is a crucial issue for engineered wood applications, especially in cold climates. In this study, Norway spruce (Picea abies) joints (150 mm × 20 mm × 10 mm) were bonded with seven commercially available adhesives: polyurethane (PUR), polyvinyl acetate (PVAc), emulsion-polymer-isocyanate (EPI), melamine-formaldehyde (MF), phenol-resorcinol-formaldehyde (PRF), melamine-urea-formaldehyde1 (MUF1), and melamine-urea-formaldehyde2 (MUF2). Each adhesive was tested at six temperatures: 20, −20, −30, −40, −50 and −60 °C. Generally, within the temperature test range, temperature changes significantly affected the shear strength of solid wood and wood joints. As the temperature decreased, the shear strength decreased. PUR adhesive in most cases resulted in the strongest shear strength and MUF adhesive resulted in the weakest. MF and PRF adhesives responded to temperature changes in a similar manner to that of the PUR adhesive. The shear strengths of wood joints with PVAc and EPI adhesives were more sensitive to temperature change. At low temperatures, the variability of shear strengths increased with all adhesives. Percent wood failures of joints bonded with different adhesives in most cases were not sensitive to temperature changes.

  • 17.
    Wessels, C. B.
    et al.
    Stellenbosch University, South Africa.
    Crafford, P. L.
    Stellenbosch University, South Africa.
    du Toit, B.
    Stellenbosch University, South Africa.
    Grahn, Thomas
    RISE, Innventia.
    Johansson, M.
    Linnaeus University, Sweden.
    Lundqvist, Sven-Olof
    RISE, Innventia.
    Säll, H.
    Linnaeus University, Sweden.
    Seifert, T.
    Stellenbosch University, South Africa.
    Variation in physical and mechanical properties from three drought tolerant Eucalyptus species grown on the dry west coast of Southern Africa2016In: European Journal of Wood and Wood Products, ISSN 0018-3768, E-ISSN 1436-736X, Vol. 74, no 4, p. 563-575Article in journal (Refereed)
    Abstract [en]

    Southern Africa, and specifically its western parts is dominated by low rainfall areas, and it is expected that the rainfall in most of these parts will in future decrease further due to climate change. Woodlots of fast-growing, non-invasive tree species can provide the opportunity to produce wood and release the pressure on natural woodlands, while creating much needed income to inhabitants. Over the last two decades several trials of Eucalyptus species that could potentially withstand arid conditions were established on the South African west coast. The three most promising genotypes according to their volume growth were selected among 46 pure and hybrid species from two 20-year-old trials for further evaluation. These included 10 Eucalyptus grandis × Eucalyptus camaldulensis hybrid trees, 9 Eucalyptus gomphocephala trees, and 9 Eucalyptus cladocalyx trees for a total of 28 trees. The objective of the study reported here was to investigate the within-tree and between species variability of selected physical and processing properties determining the suitability of these three species for lumber production. The density, microfibril angle, spiral grain angle, MOE, MOR, radial and tangential shrinkage, twist, bow, splitting, and collapse were measured in a radial and longitudinal gradient. Valuable insights were gained which could provide decision support for planting, processing and further research on these species when grown in arid conditions. The E. grandis × camaldulensis hybrid was inferior in terms of most relevant properties to the other two species evaluated. The main shortcoming of both E. gomphocephala and E. cladocalyx was the high levels of twist in lumber.

  • 18.
    Ziethén, Rune
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, Trätek.
    Reliability of proof-loaded Norway spruce2008In: European Journal of Wood and Wood Products, ISSN 0018-3768, E-ISSN 1436-736X, Vol. 66, no 6, p. 401-408Article in journal (Refereed)
  • 19.
    Östman, Birgit
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, Trätek.
    Mikkola, Esko
    European classes for the reaction to fire performance of wood products2006In: European Journal of Wood and Wood Products, ISSN 0018-3768, E-ISSN 1436-736X, Vol. 64, no 4, p. 327-337Article in journal (Refereed)
    Abstract [en]

    The new classification system for the reaction to fire performance of building products in Europe has been applied to five different product families of wood: Wood-based panels, Structural timber, Glued laminated timber, Solid wood panelling and cladding and Wood flooring as being ‘products with known and stable fire performance’. The European classification system includes two sub-systems, one main system for all construction products except floorings and the other for flooring products. Wood properties such as density, thickness, joints and types of end use application including different substrates have been studied thoroughly and are included in the classification. Most wood products fall in classes D-s2, d0 or Dfl-s1 (for floorings). Testing has been performed according to EN 13823 (2002) SBI- Single Burning Item test, EN ISO 9239-1 (2002) Radiant panel test, and EN ISO 11925-2 (2002) Small flame test. In all, more than one hundred wood products in different end use applications have been studied. Clear relationships between the main Euroclass fire performance parameters and product parameters (such as density and thickness) have been demonstrated. Tables with reaction to fire classification of different wood products and end use applications have been developed, approved by the European Commission and published in their Official Journal. This procedure is ongoing with further official decisions to be published.

  • 20.
    Žigon, J.
    et al.
    University of Ljubljana, Slovenia.
    Sedighi Moghaddam, Maziar
    RISE Research Institutes of Sweden, Bioeconomy and Health, Material and Surface Design.
    Wålinder, M. E. P.
    KTH Royal Institute of Technology, Sweden.
    Wettability and surface interactions of natural and thermally modified beech wood with water and water-based coatings: the effect of surface pre-treatment type2023In: European Journal of Wood and Wood Products, ISSN 0018-3768, E-ISSN 1436-736X, Vol. 81, p. 73-Article in journal (Refereed)
    Abstract [en]

    Proper surface pre-treatment plays an important role for good compatibility between the wood and the coating. The present study aimed to determine the correlations between the type of surface pre-treatment and the wettability for unmodified and thermally modified beech (Fagus sylvatica L.) wood with water and water-based coatings. A new approach to evaluate the water permeability of coating systems was developed by investigating the wettability of wood samples using the multicycle Wilhelmy plate method in combination with immersion of the coated samples in water. The treatment with non-thermal plasma made the wood surfaces more hydrophilic and treatment with organic solvent made the surfaces more hydrophobic. The poorer wettability and sorption with water and coatings in thermally modified wood was clearly related to the altered chemical composition of wood. As the water content in coating increased, the amount of absorbed coating in the wood decreased. The surface pre-treatments had no effect on the colour of the coated wood. The higher water content in the coating negatively affected the water protection performance of the coated wood. The thinner coating films correlated with greater water absorption in the coated wood, generally resulting in microscopic delamination between the wood substrate and the coating films. © 2022, The Author(s)

1 - 20 of 20
CiteExportLink to result list
Permanent link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf