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  • 1.
    Beyer, Gunilla
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, Trätek.
    Sterley, Magdalena
    Limning av pallförband och pallar1999Report (Other academic)
    Abstract [sv]

    Spikade förband i lastpallar utgör i vissa sammanhang ett problem från skade- och återvinningssynpunkt. Spikkrypning kan orsaka godsskador och spikar kan även orsaka problem från återvinningssynpunkt. Under senare år har det skett en stor utveckling på limsidan och marknaden för lim och limmade produkter ökar. Limning är därför ett intressant alternativ till spikning. Vad som söktes var ett lim som kan användas på sågade ytor, har fogfyllande egenskaper, ger en elstisk fog, är lätt att hantera och applicera, inte kräver höga presstryck, höga temperaturer eller lång tid att härda, tål klimatpåkänningar, är acceptabelt från miljösynpunkt och inte orsakar problem vid återvinning. I den här rapporten redovisas utprovning av några limtyper.

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  • 2.
    Blomqvist, Lars
    et al.
    RISE - Research Institutes of Sweden (2017-2019), Built Environment, Building Technology.
    Sterley, Magdalena
    RISE - Research Institutes of Sweden (2017-2019), Bioeconomy, Biobased Materials.
    Ormarsson, Sigurdur
    Linnaeus University, Sweden.
    Impact of surface pressure on the shape stability of laminated veneer products2019In: Proceedings of the 15th Annual Meeting of the Northern European Network for Wood Science and Engineering WSE 2019 / [ed] Maria Fredriksson, Lund: Lund University , 2019, p. 164-166Conference paper (Other academic)
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  • 3.
    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.

  • 4.
    Blomqvist, Lars
    et al.
    Linnaeus University, Sweden.
    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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  • 5. Blyberg, Louise
    et al.
    Serrano, Erik
    Enquist, Bertil
    Sterley, Magdalena
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP Trä.
    Adhesive joints for structural timber/glass applications: Experimental testing and evaluation methods2012In: International Journal of Adhesion and Adhesives, ISSN 0143-7496, E-ISSN 1879-0127, Vol. 35, p. 76-87Article in journal (Refereed)
  • 6.
    Ekstedt, Jan
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, Trätek.
    Rosenkilde, Anders
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, Trätek.
    Hameury, Stéphane
    Sterley, Magdalena
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP - Sveriges Tekniska Forskningsinstitut, SP Trä.
    Berglind, Henrik
    Measurement of moisture content profiles in coated and uncoated Scots Pine using Magnetic Resonance Imaging2007In: Quality Control for Wood and Wood Products - COST E53 The First Conferenc, Warsaw University of Life Sciences , 2007, , p. 27-32Conference paper (Refereed)
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  • 7. Ekstedt, Jan
    et al.
    Sterley, Magdalena
    University of Arts, Crafts and Design, Department of Design, Interior Architecture and Visual Communication (DIV), Graphic Design & Illustration.
    Rosenkilde, Anders
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, Trätek.
    Spinnande väte ger bilder av vatten2007Report (Refereed)
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  • 8. Hameury, Stéphane
    et al.
    Sterley, Magdalena
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, Trätek.
    Magnetic resonance imaging of moisture distribution in Pinus sylvestris L. exposed to daily indoor relative humidity fluctuations2006In: Wood Material Science & Engineering, ISSN 1748-0272, E-ISSN 1748-0280, Vol. 1, no 3, p. 116-126Article in journal (Refereed)
  • 9.
    Henriksson, Marielle
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, Trätek.
    Sterley, Magdalena
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, Trätek.
    Danvind, Jonas
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, Trätek.
    Glulam Posts with Thermally Modified Spruce for Outdoor Applications2009In: Proceedings of The Fourth European Conference on Wood Modification., SP Technical Research Institute of Sweden , 2009, , p. 577-584Conference paper (Other academic)
  • 10.
    Henriksson, Marielle
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP Trä.
    Sterley, Magdalena
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP Trä.
    Danvind, Jonas
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP Trä.
    Westin, Mats
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP Trä.
    Evaluation of adhesive bonds in glulam posts with thermally modified spruce2009In: International Conference on Wood Adhesives 2009, Forest Products Society , 2009, , p. 295-300Conference paper (Refereed)
  • 11.
    Jermer, Jöran
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, Trätek.
    Sterley, Magdalena
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, Trätek.
    Zmniejsz ryzyko powstawania przebarwień mikrobiologicznych na drewnie impregnowanym ciśnieniowo2008Report (Refereed)
    Abstract [sv]

    Polsk version av 2004:15 Minska risken för missfärgande svampar på tryckimpregnerat virke.

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  • 12.
    Kärrfelt, Ylva
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, Trätek.
    Ekstedt, Jan
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, Trätek.
    Sterley, Magdalena
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, Trätek.
    Knot staining after artificial and natural exposure - Evaluation of testing methods2008In: PRA’s 6th International Woodcoatings Congress:, PRA , 2008, , p. 11Conference paper (Refereed)
  • 13.
    König, Jürgen
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, Trätek.
    Norén, Joakim
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, Trätek.
    Sterley, Magdalena
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, Trätek.
    Effect of adhesives on finger joint performance in fire2008In: CIB-W18, Meeting 41.Proceedings., 2008, , p. Paper CIB-W18/41-16-1.Conference paper (Refereed)
  • 14. Nussbaum, Ralph M.
    et al.
    Sterley, Magdalena
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, AB Trätek.
    The effect of wood extractive content on glude adhesion and surface wettability of wood2002In: Wood and Fiber Science, ISSN 0735-6161, Vol. 34, no 1, p. 57-71Article in journal (Refereed)
  • 15.
    Ong, Chee Beng
    et al.
    University of Bath, UK.
    Chang, Wen Shao
    University of Sheffield, UK.
    Ansell, Martin P.
    University of Bath, UK.
    Brandon, Daniel
    RISE - Research Institutes of Sweden (2017-2019), Safety and Transport, Safety.
    Sterley, Magdalena
    RISE - Research Institutes of Sweden (2017-2019), Bioeconomy, Biobased Materials.
    Walker, Pete
    University of Bath, UK.
    Bench-scale fire tests of Dark Red Meranti and Spruce finger joints in tension2018In: Construction and Building Materials, ISSN 0950-0618, E-ISSN 1879-0526, Vol. 168, p. 257-265Article in journal (Refereed)
    Abstract [en]

    This study investigates the secondary failure of Malaysian Dark Red Meranti (Shorea spp.) and Spruce (Picea abies) finger joints in a glulam beam in a fire test using a bench-scale test set-up. Secondary failure is the occurrence of failure of the bond lines due to fire and the falling off of the outermost tension layers, exposing the uncharred inner layers to a sudden increase of fire intensity. The lack of published work and the difficulties in describing the behaviour of the finger joints after the secondary failure in a full-scale fire test has identified the need for a simple bench-scale method, incorporating the conditions of the standard fire test. This paper focusses on the performance of the finger joints which together with other defects such as knots and splits are generally the weakest component in the glulam beam. The finger joints were bonded with structural adhesives, specifically phenol resorcinol formaldehyde (PRF) and polyurethane (PUR). They were tested in tension to imitate the failure of finger joints on the tension side of a standard fire test of a glulam beam. Constant heat flux was introduced to the finger-jointed specimens to replicate the secondary failure of a glulam beam in the standard fire test. The results of this study indicate a relationship between the charring rate and density of the specimens, with higher density Dark Red Meranti showing lower charring rate compared to the lower density Spruce specimens. Factors such as constant heat flux as opposed to the time-increasing heat flux exposure and specimen size influenced the charring rate of the specimens. The char rate was measured at the early stages of the fire test, which is known to have higher values since the build-up of the charred layers was not sufficiently substantial to protect the inner unburnt wood. Overall, the bench-scale fire test set-up was able to differentiate the fire performance of the adhesives, with PRF showing better fire performance compared to the specimens finger-jointed with PUR adhesive. In addition, tensile tests at ambient temperature showed no significant difference in tensile strength between finger joints bonded with different adhesives for the same wood species. The tensile strengths of the finger joints bonded with different adhesives were influenced by the temperature profile through the joint. The proposed bench-scale fire test was used to compare the quality of the adhesives in a fire situation, specifically with respect to secondary failure. The PRF was selected as the reference adhesive.

  • 16. Petersson, Hans
    et al.
    Bengtsson, Tomas
    Blixt, Johan
    Enquist, Bertil
    Källsner, Bo
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP – Sveriges Provnings- och Forskningsinstitut.
    Oscarsson, Jan
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP – Sveriges Provnings- och Forskningsinstitut.
    Serrano, Erik
    Sterley, Magdalena
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP – Sveriges Provnings- och Forskningsinstitut.
    Högre värdeutbyte genom våt- och torrlimning av sågade sidobrädor till egenskapsoptimerade träprodukter för byggmarknaden2009Report (Refereed)
  • 17.
    Sandberg, Karin
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, Trätek.
    Sterley, Magdalena
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, Trätek.
    Separating Norway spruce heartwood and sapwood in dried condition with near-infrared spectroscopy and multivariate data analysis2009In: European Journal of Forest Research, ISSN 1612-4669, E-ISSN 1612-4677, Vol. 128, no 5, p. 475-481Article in journal (Refereed)
  • 18. Serrano, Erik
    et al.
    Blixt, Johan
    Enquist, Bertil
    Källsner, Bo
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP Trä.
    Oscarsson, Jan
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP Trä.
    Petersson, Hans
    Sterley, Magdalena
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP Trä.
    Wet glued laminated beams using side boards of Norway spruce2011Report (Refereed)
  • 19. Serrano, Erik
    et al.
    Oscarsson, Jan
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, Trätek.
    Enquist, Bertil
    Sterley, Magdalena
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, Trätek.
    Petersson, Hans
    Källsner, Bo
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, Trätek.
    Green-glued laminated beams – High performance and added value2010In: Proceedings of World Conference on Timber Engineering - WCTE 2010, World Conference on Timber Engineering , 2010, , p. 1664-1669Conference paper (Refereed)
  • 20.
    Sterley, Magdalena
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, Trätek.
    Adhesive systems for green gluing2005In: Green gluing of wood-process-products-market, SP , 2005, , p. 26-32Conference paper (Other academic)
  • 21.
    Sterley, Magdalena
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, Trätek.
    Finger jointing of green Scots Pine2005In: Proceedings COST E34 Conference Green gluing of wood., 2005, , p. 52-61Conference paper (Other academic)
  • 22.
    Sterley, Magdalena
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, Trätek.
    Limning av otorkat virke2005Report (Refereed)
    Abstract [sv]

    Det finns nya limmer som klarar av att limma fuktigare virke, t o m nysågat och aldrig torkat virke. Från början blev denna nya process, här kallad "våtlimning", utvecklad för fingerskarvning men det är även möjligt att anpassa denna process för flat- och kantsideslimning av virke. Fingerskarvning av rått (otorkat) virke är ett koncept som möjliggör en effektiv tillverkning av förädlade träprodukter. Denna nya teknik har gradvis blivit accepterad i Nya Zeeland, USA och Kanada men är fortfarande relativt okänd i Europa. Idén bygger på att göra rätt från början, d v s att så tidigt som möjligt avskilja de virkesdelar som av kvalitetsskäl inte kan användas i den färdiga produkten. Att fingerskarva otorkat virke medför en väsentlig förkortning av ledtiderna. Det är en fördel att kunna eliminera kvalitets- och funktionsnedsättande virkesfel före torkning. Nysågat virke saknar dessutom kupighet och andra formfel som uppstår efter torkning och innebär att torkat virke måste hyvlas före skarvningen för bästa resultat.

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  • 23.
    Sterley, Magdalena
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, Trätek.
    Våtlimning limförband mellan flatsidor - laboratorieförsök2001Report (Other academic)
    Abstract [sv]

    Rapporten beskriver laboratorieförsök avseende våtlimning av granvirke flatsida mot flatsida. Med våtlimning menas att limma otorkat, nysågat virke. Det limmade virket torkas sedan efter att tvärsnittsmåttet har minskats genom klyvning d v s genom två- respektive tredelning. Tillverkningen av balkar genomfördes med två olika årsringsorienteringar (hoplägg) hos de ingående lamellerna. Hoplägg "limträ" utgjordes av lameller med mötande splint- och kärnsidor. Vid hoplägg "limfog" placerades splintsidor mot splintsidor och kärnsidor mot kärnsidor. Pressningen utfördes i en kall press med presstider mellan 30 och 120 minuter.

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  • 24.
    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)
  • 25.
    Sterley, Magdalena
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, Trätek.
    Blümer, Hartwig
    Wålinder, Magnus
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, Trätek.
    Edge and face gluing of green timber using a one-component polyurethane adhesive2005In: Proceedings COST E34 Conference Green gluing of wood., SP , 2005, , p. 91-95Conference paper (Refereed)
  • 26.
    Sterley, Magdalena
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP Trä.
    Gustafsson, P. J.
    Shear fracture characterization of green-glued polyurethane wood adhesive bonds at various moisture and gluing conditions2012In: Wood Material Science & Engineering, ISSN 1748-0272, E-ISSN 1748-0280, Vol. 7, no 2, p. 93-100Article in journal (Refereed)
  • 27.
    Sterley, Magdalena
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, Trätek.
    Gustafsson, P. J.
    Shear fracture properties of green-glued polyurethane wood adhesive bonds2005In: Serie: Forest Products Societey, Proceedings No. 7230, Forest Products Society , 2005, , p. 221-229Conference paper (Refereed)
    Abstract [en]

    The shear fracture properties of green-glued polyurethane wood adhesive bonds subjected to kiln drying were investigated. The local shear strength and fracture energy of the wood adhesive bonds were determined from experimentally recorded complete shear stress versus deformation curves of the bondline. A stable test set-up and small specimens that were anti-symmetrically loaded were used in order to get a uniform and pure state of shear stress. Different moisture contents (MCs) and pressing times were investigated. The fracture properties of conventionally dry-glued polyurethane wood adhesive bonds were used as reference. The results show that the fracture energy of green-glued bonds with PUR adhesive is dependent on the MC of wood and on press time. The same fracture energy and strength can be obtained by green gluing as by dry gluing, but there seems to exist a maximum MC of sapwood, in the range between 78% and 160%, and a minimum press time, in the range between 3h and 48h, for which it can be achieved.

  • 28.
    Sterley, Magdalena
    et al.
    RISE - Research Institutes of Sweden (2017-2019), Bioeconomy, Biobased Materials.
    Noren, Joakim
    RISE - Research Institutes of Sweden (2017-2019), Built Environment, Building Technology.
    Liblik, Johanna
    Tallinn University of Technology, Estonia.
    Brandon, Daniel
    Just, Alar
    RISE - Research Institutes of Sweden (2017-2019), Safety and Transport, Safety. Tallinn University of Technology, Estonia.
    Small-scale test method for the fire behaviour of woodadhesive bonds in CLT2018In: Book of abstracts of the final conference COST FP1404”Fire Safe Use of Bio-Based Building Products”, 2018Conference paper (Other academic)
    Abstract [en]

    There is an increasing use of cross laminated timber (CLT) in the building sector. CLT is a wood panel product made from layers of solid lumber boards. Each layer of boards is oriented perpendicular to adjacent layers and glued on the wide faces of each board. It has been recognised that different adhesive systems have different behaviour in fire; especially that delamination behaviour of CLT can be avoided by choosing a suitable adhesive system. The best method for evaluation of the delamination is a full‐scale fire test, but considering the high costs of such tests, it is of the utmost importance to develop small‐scale methods for evaluating the adhesive bond properties in fire. The intention is that such small‐scale methods should provide the same results as full‐scale tests. A new, smaller scale method for classifying adhesives with respect to  fire properties would also simplify  the planning of  full scale  tests. Previous  tested small‐scale method for evaluation of finger joints is presented in (1).  In this study, a small‐scale fire test methodology for evaluation of CLT adhesive bond performance in  fire  is  introduced  (2).  The  aim  was  to  demonstrate  an  easy  tool  to  distinguish  between  fire resistant adhesive bonds and non‐fire‐resistant bonds, especially with respect to delamination. The cone heater of a cone calorimeter was used to carry out the tests. Cone calorimeter in accordance with ISO 5660 is one of the most widely used bench‐scale instrument in fire research. This small‐scale  device  has  several  advantages  over  larger‐scale  tests  thanks  to  its  fast,  simple  and  cost‐efficient manner to investigate basic material properties.  

  • 29.
    Sterley, Magdalena
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, Trätek.
    Serrano, Erik
    Enquist, Bertil
    Flat-wise green-gluing of Norway spruce for structural application2009In: Proceedings of International Conference on Wood Adhesives 2009, Forest Products Society , 2009, , p. 325-334Conference paper (Refereed)
  • 30.
    Sterley, Magdalena
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut.
    Serrano, Erik
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP Trä.
    Enquist, Bertil
    Linnaeus University, Sweden.
    Fracture characterisation of green-glued polyurethane adhesive bonds in Mode I2013In: Materials and Structures, ISSN 1359-5997, E-ISSN 1871-6873, Vol. 46, no 3, p. 421-434Article in journal (Refereed)
    Abstract [en]

    Unseasoned (green) spruce timber side boards of size 25 × 120 × 600 mm were flatwiseglued with a one-component PUR adhesive. Glued pairs of boards were then kiln-dried to 12 % moisture content. A special small-scale specimen for testing the fracture properties of the adhesive bond in Mode I was developed in order to evaluate the adhesive bond properties. The complete force versus deformation curve, including both the ascending and the descending parts, could be obtained with these small-scale specimens, enabling the strength and fracture energy of the bond line to be calculated. In addition, the fractured specimens were examined by scanning electron microscope. Results show that both the tensile strength and the fracture energy of the green glued PUR adhesive bonds were equal to those of the dry glued bonds. The methodology developed and used in the present study gives new possibilities for analysis of the mechanical behaviour of wood adhesive bonds, and particularly of their brittleness and its correlation with the type of fracture path. This is in sharp contrast to the use of standardised test methods (e.g. EN 302, ASTM D905) with specimens having relatively large glued areas. Using such types of specimens, it is not possible to obtain the complete force versus deformation response of the bond. In addition, when using such test methods, failure takes place in the wood or in the fibres near the bond, thus making it impossible to obtain detailed information about the bond line characteristics.

  • 31.
    Sterley, Magdalena
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, Trätek.
    Serrano, Erik
    Enquist, Bertil
    Fracture characterization of green glued polyurethane adhesive bonds in tension2008In: Limning av trä - mot trä, metall, plast och glas. Sopron, Hungary. 2008-10-22--23, University of West Hungary. SP Trätek, Swerea IVF , 2008, , p. 156-166Conference paper (Refereed)
  • 32.
    Sterley, Magdalena
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP Trä.
    Trey, Stacy
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP Trä.
    Lundevall, Åsa
    RISE, Swerea, IVF.
    Olsson, Sara
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP Trä.
    Influence of cure conditions on the properties of a one-compenent moisture-cured polyurethane adhesive in the context of green gluing of wood2012In: Journal of Applied Polymer Science, ISSN 0021-8995, E-ISSN 1097-4628, Vol. 126, no S1, p. E297-E304Article in journal (Refereed)
  • 33.
    Vikberg, Tommy
    et al.
    Luleå Technical University, Sweden.
    Hansson, Lars
    Luleå Technical University, Sweden.
    Sterley, Magdalena
    RISE, SP – Sveriges Tekniska Forskningsinstitut.
    Moisture movements during drying of green glued glulam beams from Norway spruce sideboards2012Conference paper (Refereed)
    Abstract [en]

    Form defects such as cup, crook, twist and bow, often causes low volumetric and economical yield in dried sideboards of Norway spruce. The high stiffness and density of sideboards, however, make them attractive to use as structural timber. The green gluing process i.e. gluing of unseasoned timber (with the subsequent drying) can make gluing of side boards efficient and can overcome the difficulties in utilization of side boards for structural applications.In present work, a study where computed tomography was used to monitor the drying process of a green glued glulam beam is presented. The beam had a dimension in cross-section of approximately 105×235 mm2 and consisted of eleven sideboards, planed and flat wise glued together with a 1-component polyurethane adhesive. After curing, and prior to drying, the beam was split into two halves, of approximate size of 50×235 mm2.The drying took place in a small drying kiln and computed tomography scanning was done every second hour throughout the drying process to get the density distribution in the beam. When the drying was finished the temperature in the kiln was increased to 103°C and kept for 24 hours, as to get a dry density reference. By use of an algorithm for subtracting the dry density, the moisture evaporation throughout the drying process could be estimated. Despite the harsh drying conditions, with a wet bulb depression of 10°C already from the start of the drying process, no formation of cracks or other quality problems could be seen in the process. Neither could any moisture gradient from the outer to the inner boards be detected.

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  • 34.
    Westin, Mats
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, Trätek.
    Sterley, Magdalena
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, Trätek.
    Rossi, Frédéric
    Hervé, Jean-Jérémie
    Compreg-type products by furfurylation during hot-pressing2009In: Wood Material Science & Engineering, ISSN 1748-0272, E-ISSN 1748-0280, Vol. 4, no 1-2, p. 67-75Article in journal (Refereed)
  • 35.
    Westin, Mats
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, Trätek.
    Sterley, Magdalena
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, Trätek.
    Rossi, Frédéric
    Hervé, Jean-Jérémie
    Compreg-type products by furfurylation during hot-pressing2009In: Proceedings of The Fourth European Conference on Wood Modification., SP Technical Research Institute of Sweden , 2009, , p. 561-568Conference paper (Other academic)
1 - 35 of 35
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