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  • 1.
    Blomberg, Jonas
    et al.
    Dalarna University, School of Technology and Business Studies, Wood Technology.
    Persson, Bengt
    Dalarna University, School of Technology and Business Studies, Wood Technology.
    An algorithm for comparing density in CT-images taken before and after compression of Pinus sylvestris2005In: European Journal of Wood and Wood Products, ISSN 0018-3768, E-ISSN 1436-736X, Vol. 63, no 1, p. 23-29Article in journal (Refereed)
    Abstract [en]

    Ten plain-sawn boards of Scots pine (Pinus sylvestris L.) were compressed semi-isostatically according to the CaLignum process in a Quintus press at 25 C and 140 MPa. X-ray computerised tomography images of the same cross-sections were captured before and after compression and compared using a transformation algorithm. In the algorithm the shape of compressed cross-sections were converted to the same shape as non-compressed using the density variation between pixels. Density after compression and the increase in density were analysed using PLS regression. The regressor variables described position in the cross-section and wood properties of each pixel. Heartwood and other resinous wood were less compressed than sapwood, particularly in boards with high resin content. Density also increased little close to the press table, especially in whorls with large knots. Higher original density gives lower degree of compression but still higher density after compression.

  • 2.
    Blomberg, Jonas
    et al.
    Dalarna University, School of Technology and Business Studies, Wood Technology.
    Persson, Bengt
    Dalarna University, School of Technology and Business Studies, Wood Technology.
    Plastic deformation in small clear pieces of Scots Pine (Pinus sylvestris L.) during densification with the Calignum® process2004In: Journal of Wood Science, ISSN 1435-0211, E-ISSN 1611-4663, Vol. 50, no 4, p. 307-314Article in journal (Refereed)
  • 3.
    Blomberg, Jonas
    et al.
    Dalarna University, School of Technology and Business Studies, Forest and Wood Technology.
    Persson, Bengt
    Dalarna University, School of Technology and Business Studies, Forest and Wood Technology.
    Swelling pressure of semi-isostatically densified wood under different mechanical restraints2007In: Wood Science and Technology, ISSN 0043-7719, E-ISSN 1432-5225, Vol. 41, no 5, p. 401-415Article in journal (Refereed)
    Abstract [en]

    Semi-isostatically densified and native wood samples of Scots pine and European birch were soaked in water. The swelling coefficients as well as the swelling pressure, that arose when the specimens were restrained in some way prior to the swelling, were measured using a universal testing machine equipped with a high resolution load-cell and an external extensometer. As densified wood swells, the native structure is almost restored and the swelling pressure became twice as high as for native wood in the most compressed directions (radial for pine and birch). That cell-shape recovery increases the swelling pressure can explain the problems with imbalance in laminated constructions where densified wood is used. The possibility to predict the swelling pressure from basic material properties was evaluated. The correlations between swelling pressure and material properties were strong enough to yield good predictive models.

  • 4. Hogberg, Karl-Anders
    et al.
    Persson, Bengt
    Dalarna University, School of Technology and Business Studies, Forest and Wood Technology.
    Hallingback, Henrik R.
    Jansson, Gunnar
    Relationships between early assessments of stem and branch properties and sawn timber traits in a Pinus sylvestris progeny trial2010In: Scandinavian Journal of Forest Research, ISSN 0282-7581, E-ISSN 1651-1891, Vol. 25, no 5, p. 421-431Article in journal (Refereed)
    Abstract [en]

    A sample of 162 trees was harvested from a 36-year-old Scots pine (Pinus sylvestris L.) progeny trial to evaluate correlations between early measurements of branch diameter, and other stem and branch traits, with sawn timber traits, and hence their potential utility for predicting wood quality. The sample trees were assigned to three genetic groups of small, medium and large branch diameter, based on parental breeding values. Bottom logs were cut and sawn, and several important traits for the visual quality of the boards were assessed. Phenotypic correlations were then estimated between these traits and measurements of the height, diameter, branch diameter, branch angle, stem crookedness, number of branches and grain angle under bark of the corresponding trees when they were 16 and 36 years old. The diameter of the coarsest knot in the board was correlated with the branch diameter at the age of 16 years (0.50), and there were significant differences in this trait among the genetic branch diameter groups. In addition, the board twist was correlated with the grain angle under bark at the age of 36 years (0.54). Thus, the field assessments of branch diameter and grain angle under bark show relevance for the visual quality of centrally sawn small timber.

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