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  • 1. Brännström, Mattias
    et al.
    Oja, Johan
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, Trätek.
    Grönlund, Anders
    Predicting board strength by X-ray scanning of logs: The impact of different measurement concepts2007Ingår i: Scandinavian Journal of Forest Research, ISSN 0282-7581, E-ISSN 1651-1891, Vol. 22, nr 1, s. 60-70Artikel i tidskrift (Refereegranskat)
  • 2. Gräns, D.
    et al.
    Hannrup, B.
    Isik, F.
    Lundqvist, Sven-Olof
    RISE., STFI-Packforsk.
    McKeand, S.
    Genetic variation and relationships to growth traits for microfibril angle, wood density and modulus of elasticity in a Picea abies clonal trial in southern Sweden2009Ingår i: Scandinavian Journal of Forest Research, ISSN 0282-7581, E-ISSN 1651-1891, Vol. 24, nr 6, s. 494-503Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Genetic variation in wood density, microfibril angle (MFA), wood stiffness (MOE), height, diameter and volume was investigated in a 26-year-old Norway spruce [(Picea abies (L.) Karst.] clonal trial in southern Sweden. Wood quality measurements were performed on 10 mm increment cores using SilviScan. For MFA, mean values of annual rings showed the highest value (30°) at ring 2 counting from the pith, followed by a steep decrease and a gradual stabilization around ring 12 at approximately 14°. MOE showed a monotonic increase from 5 GPa to 14 GPa when moving from pith to bark. High broad-sense heritability values were found for wood density (0.48), MFA (0.41) and MOE (0.50). All growth traits displayed heritability values of similar magnitudes as reported in earlier studies. The generally high age-age correlations between different sections of the wood cores suggested that early selection for wood quality traits would be successful. Owing to unfavorable genetic correlations between volume and MOE, the correlated response indicated that selection for volume only at age 10 would result in a 0.27% decrease in weighted MOE at age 26 for every 1% increase in volume.

  • 3.
    Hong, Zhou
    et al.
    SLU Swedish University of Agricultural Sciences, Sweden.
    Fries, Anders
    SLU Swedish University of Agricultural Sciences, Sweden.
    Lundqvist, Sven-Olof
    RISE., Innventia.
    Andersson Gull, Bengt
    Skogforsk, Sweden.
    Wu, Harry X.
    SLU Swedish University of Agricultural Sciences, Sweden; CSIRO Commonwealth Scientific and Industrial Research Organisation, Australia.
    Measuring stiffness using acoustic tool for Scots pine breeding selection2015Ingår i: Scandinavian Journal of Forest Research, ISSN 0282-7581, E-ISSN 1651-1891, Vol. 30, nr 4, s. 363-372Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Stiffness (modulus of elasticity, MOE) of conifer trees is the most important trait for structural wood products. Finding a fast, reliable and non-destructive way to measure MOE is a priority for screening large progeny trials in tree breeding programmes. For Scots pine, time-of-flight (TOF) velocity measured on standing trees accounted for 47% of the variation to the benchmark SilviScan-based clearwood MOE (MOEs), under the assumption of constant wood density. If wood density was included, 59% of the variation was accounted for. The TOF stiffness measurements on standing trees were, however, more related to the clearwood MOEs in the outerwood, and the prediction was the most reliable at breast height compared to the stem base and the top section. Microfibril angle (MFA) had higher correlation with acoustic velocity (VEL) of standing trees than wood density, and among the early, transition and latewood density, the latewood density had the highest correlation with stiffness measurements on standing trees. VEL measured at breast height in combination with wood density was the most reliable predictor of MOE of standing trees for selection and breeding in Scots pine.

  • 4.
    Lindström, Tom
    et al.
    RISE., Innventia. KTH Royal Institute of Technology, Sweden.
    Aulin, Christian
    KTH Royal Institute of Technology, Sweden.
    Market and technical challenges and opportunities in the area of innovative new materials and composites based on nanocellulosics2014Ingår i: Scandinavian Journal of Forest Research, ISSN 0282-7581, E-ISSN 1651-1891, Vol. 29, nr 4, s. 345-351Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    This communication is a review over the major market and technical challenges and opportunities for nanocellulosic materials on a large scale but in low-to-medium-end markets. Basically, the potential use of nanocellulose as a wet-end strength additive in papermaking has been known for decades, but not come into operation because of the high-energy costs of producing these materials. Cost performance compared to starch derivatives is one challenge, and the other is to design suitable dewatering/retention aid systems. Other paper applications are as a surface-sizing agent and as a barrier coating material. Major challenges are associated with the high viscosity of nanocellulosic materials and how to apply the nanocellulose in order to obtain good surface coverage. There are several opportunities in the nanocomposite markets. The packaging sector together with the automotive sector and the building sector constitute large potential markets. Challenges are related to the mixing of hydrophobic and hydrophilic materials so that a good dispersion of nanocellulose is obtained. Scaling up of nanocellulose production processes and procedures for nanocomposite manufacturing in order to obtain price-performance in the various applications remains, as expected, the largest challenge.

  • 5.
    Lycken, Anders
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, Trätek.
    Oja, Johan
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, Trätek.
    A multivariate approach to automatic grading of Pinus sylvestris sawn timber2006Ingår i: Scandinavian Journal of Forest Research, ISSN 0282-7581, E-ISSN 1651-1891, Vol. 21, nr 2, s. 167-174Artikel i tidskrift (Refereegranskat)
  • 6.
    Roos, Anders
    et al.
    SLU Swedish University of Agricultural Sciences, Sweden.
    Lindström, Mikael
    RISE., Innventia.
    Heuts, Lena
    Chalmers University of Technology, Sweden.
    Hylander, Nippe
    AF Consult, Sweden.
    Lind, Erik
    Stora Enso, Sweden.
    Nielsen, Christian
    Pöyry Management Consulting, United Kingdom.
    Innovation diffusion of new wood-based materials - reducing the "time to market"2014Ingår i: Scandinavian Journal of Forest Research, ISSN 0282-7581, E-ISSN 1651-1891, Vol. 29, nr 4, s. 394-401Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The purpose of this study is to understand the innovation diffusion of new wood-based materials, "from lab to market," to identify the success factors and barriers to market introduction, and to reveal important factors for the success of commercialization. Examples are given from target markets in the furniture, appliance, and automotive sectors. This study is based on three qualitative interview studies in Sweden from 2010 to 2012. The analysis showed that the diffusion process of a new bio-based material normally takes up to 10 years or even more. There are only a few companies along the supply chain whose specialized function is finding new materials. However, the automotive industry regularly monitors the development of new materials. Industrial customers of materials generally obtain information about biobased materials from suppliers, exhibitions, conferences, professional contacts, industry magazines, digital media, customers, and partners in development projects. Different industry sectors apply specific material requirements. Regulations regarding safety issues have a high priority, and the interviewees believed that environmental considerations will increase with time. If the materials are equal in other quality dimensions, environmental performance may cast the deciding vote. Recommendations for a faster diffusion cover the right mix of competences, financing, regulations, creativity, and support from the leadership.

  • 7.
    Skog, Johan
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, Trätek.
    Oja, Johan
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, Trätek.
    Density measurements in Pinus sylvestris sawlogs combining X-ray and three-dimensional scanning2010Ingår i: Scandinavian Journal of Forest Research, ISSN 0282-7581, E-ISSN 1651-1891, Vol. 25, nr 5, s. 470-481Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Wood density is an important quality variable, closely related to the mechanical properties of the wood. Precise wood density measurements in the log sorting would enable density sorting of logs for products such as strength-graded wood and finger-jointed wood. Density sorting of logs would also give more homogeneous drying properties and thus improve the quality of the final products. By compensating the radiographs from an X-ray log scanner for the varying path lengths using outer shape data from a three-dimensional (3D) scanner, it is possible to make precise estimates of both green and dry density. Measurements on simulated industrial data were compared with densities measured in computed tomographic (CT) images for 560 Scots pine (Pinus sylvestris L.) logs. It was found that green sapwood density could be measured with predictability R 2=0.65 and root mean square error (RMSE) of 25 kg m-3. Green and dry heartwood densities were measured with similar precision: R 2=0.79 and RMSE=32 kg m-3 for green density and R 2=0.83 and RMSE=32 kg m-3 for dry density.

  • 8.
    Skog, Johan
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, Trätek.
    Oja, Johan
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, Trätek.
    Heartwood diameter measurements in Pinus sylvestris sawlogs combining X-ray and three-dimensional scanning2009Ingår i: Scandinavian Journal of Forest Research, ISSN 0282-7581, E-ISSN 1651-1891, Vol. 24, nr 2, s. 182-188Artikel i tidskrift (Refereegranskat)
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