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  • 1.
    Blomqvist, Lars
    et al.
    RISE - Research Institutes of Sweden, Built Environment, Building Technology. Linnaeus University, Sweden.
    Berg, Sven
    Luleå University of Technology, Sweden.
    Sandberg, Dick
    Luleå University of Technology, Sweden; Czech University of Life Sciences Prague, Czech.
    Distortion in Laminated Veneer Products Exposed to Relative-Humidity Variations Experimental Studies and Finite-Element Modelling2019In: BioResources, ISSN 1930-2126, E-ISSN 1930-2126, Vol. 14, no 2, p. 3768-79Article in journal (Refereed)
    Abstract [en]

    A shortcoming of the laminated bending process is that the product may become distorted after moulding. This study focused on the influence of fibre orientation deviation for individual veneers on the distortion of a moulded shell. The distortion of 90 cross-laminated shells of the same geometrical shape, consisting of seven peeled birch veneers, were studied under relative humidity variation. All the veneers were straight-grained in the longitudinal-tangential plane, but to simulate a deviation in fibre orientation, some of the individual veneers were oriented at an angle of 7 degrees relative to the main orientation of the other veneers in the laminate. A finite element model (FEM) was applied to study the possibility of predicting the results of a practical experiment. The study confirms the well-known fact that deviation in fibre orientation influences shape stability. The results also show how the placement of the abnormal veneer influences the degree of distortion. From this basic knowledge, some improvements in the industrial production were suggested. However, the FE model significantly underestimated the results, according to the empirical experiment, and it did not show full coherence. The survey shows the complexity of modelling the behaviour of laminated veneer products under changing climate conditions and that there is a great need to improve the material and process data to achieve accurate simulations. Examples of such parameters that may lead to distortion are density, annual ring orientation in the cross section of the veneer, the orientation of the loose and tight sides of the veneer, and parameters related to the design of the moulding tool.

  • 2.
    Blomqvist, Lars
    et al.
    RISE - Research Institutes of Sweden, Built Environment, Building Technology.
    Honfi, Daniel
    RISE - Research Institutes of Sweden, Built Environment, Building Technology.
    Johansson, Marie
    RISE - Research Institutes of Sweden, Built Environment, Building Technology.
    Spin-off från möbelindustrin till byggbranschen2019Report (Other academic)
    Abstract [en]

    There is a deficit of housing in Sweden and it is built too little to compensate for this according to the National Board of Housing, Building and Planning, which, among other things, indicate resource shortages as a reason.

    The furniture and construction industry have much in common. However, the furniture industry has a larger share of industrial production, which means production at a lower cost. By retrieving production ideas in other industries, there is an opportunity to radically renew and transform the (wood) construction industry and thus streamline the construction process. Historically, cross-sectoral spin-off effects have been shown to generate success factors.

    The goal of this project is to develop prototypes for building connections inspired by the furniture and interior industry and explore them together with industry actors. This, in turn, serves as an inspiration for a larger project, together with industry actors aiming at developing systems for assembly of building elements, which provide higher precision and are faster to perform than today's system. The pilot developed in this project shows that the idea is ripe for a more full-scale investigation.

  • 3.
    Blomqvist, Lars
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, Trätek.
    Oscarsson, Jan
    Svensson, Nils
    Säkerhet och organisation vid CNC-maskiner i träindustrin2002Report (Other academic)
    Abstract [sv]

    Denna rapport är en redovisning av projektet Säkerhet och organisation vid CNC-maskiner i träindustrin. Målsättningen med detta projekt har varit att utveckla, beskriva och sprida kunskap om arbetssätt, arbetsorganisation och kringutrustning vid arbete med träbearbetande CNC-maskiner. Sådant arbete är förknippat med stora risker, vilket bl a beror på maskinernas komplexitet, höga varvtal samt korta bearbetningstider i kombination med manuell hantering av arbetsstycken. Det sistnämnda innebär att en operatör ofta arbetar nära en maskins arbetsområde samtidigt som maskinen är i drift. Innehållet i denna rapport bygger på en inledande litteraturstudie, en inventering av olycksfall och incidenter samt fallstudier vid tre företag och en gymnasieskola.

  • 4.
    Blomqvist, Lars
    et al.
    RISE - Research Institutes of Sweden, Built Environment, Building Technology.
    Sterley, Magdalena
    RISE - Research Institutes of Sweden, Bioeconomy, Biobased Materials.
    Ormarsson, Sigurdur
    Linnaeus University, Sweden.
    Impact of surface pressure on the shape stability of laminated veneer products2019In: Proceedings ofthe 15th Annual Meeting ofthe Northern European Network for Wood Science and EngineeringWSE2019 / [ed] Maria Fredriksson, Lund: Lund University , 2019, p. 164-166Conference paper (Other academic)
  • 5.
    Blomqvist, Lars
    et al.
    Linnaeus University, Sweden.
    Sterley, Magdalena
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Hållbar Samhällsbyggnad.
    Sandberg, Dick
    Luleå University of Technology, Sweden.
    Johansson, Jimmy
    Linnaeus University, Sweden.
    The effect of veneer modification on the bond-line strength in laminated veneer products2015In: Pro Ligno, ISSN 1841-4737, E-ISSN 2069-7430, Vol. 11, no 4, p. 43-49Article in journal (Refereed)
    Abstract [en]

    A major problem in the manufacture of three-dimensional laminated veneer products (LVP) is damage due to stretching and/or buckling of the veneer. To reduce or eliminate this problem, veneer densification or adding a strengthening layer to the veneer can be an alternative. To study how veneer modification influences the veneer-to-adhesive bond strength, three methods of modification were studied in relation to an unmodified reference veneer: (1) densified veneer, (2) veneer pre-bonded with paper and hot melt adhesive (HMA), (3) veneer pre-bonded with non-woven polypropylene (NW) fabric glued to the veneer (a) with a urea formaldehyde (UF) adhesive, (b) with a mixture of UF and polyvinyl acetate (PVAc) adhesive, and (c) with a PVAc adhesive. Densification, pre-bonding with paper, and NW with UF/PVAc adhesive mixture resulted in no or only a slight decrease in strength of the bond-line compared to the reference. NW glued with UF or PVAc adhesive showed a considerable reduction in the strength of the bond-line. The climatic cycling had no significant influence on the bond strength.

  • 6.
    Blomqvist, Lars
    et al.
    Linnéuniversitetet.
    Sterley, Magdalena
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP Trä.
    Sandberg, Dick
    Johansson, Jimmy
    The influence of veneer modification on adhesive bond strength2014In: Proceedings of 10th Meeting of the Northern European Network for Wood Science & Engineering (WSE 2014)., Edinburgh Napier University , 2014, , p. 150-155Conference paper (Refereed)
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