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Observation of anisotropic water movement in Pinus radiata D. Don sapwood above fiber saturation using magnetic resonance micro-imaging

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Abstract

Magnetic resonance micro-imaging has been used to visualise the movement of water during the drying of Pinus radiata D. Don (radiata pine) wood samples of varying annual ring orientation and dimension. The drying process has shown a strong influence of annual ring orientation for thin boards with drying deviating from the classical core-shell model. Diffusion tensor micro-imaging shows the direction of greatest restriction to diffusion being in the transverse radial direction. Similarly, anisotropic values for T2 relaxation are observed, with values obtained when the transverse face is normal to the static magnetic field being higher than in the case when the radial or tangential faces are normal to the field.

Zusammenfassung

Magnetische Resonanz-Mikrophotographie wurde angewandt, um die Wasserbewegung während des Tocknungsvorgangs in Proben von Pinus radiata D. Don mit variierender Ringausrichtung und -durchmesser sichtbar zu machen. Es hat sich gezeigt, dass der Trocknungsprozess stark von der Jahrringausrichtung bei dünnen Brettern beeinflusst ist, wobei die Trocknung von dem klassischen Kern-Schale-Modell abwich. Die Mikroaufnahme des Diffusion-Tensors zeigte die Ausrichtung größter Diffusionshemmung in transversal-radialer Richtung. Ähnlich wurden anisotropische Werte für die T2-Relaxation beobachtet, deren Werte, die erhalten wurden, wenn die transversale Fläche sich gegenüber dem statischen Magnetfeld senkrecht befand, höher waren als diejenigen, bei denen sich die radialen oder tangentialen Flächen senkrecht zum Magnetfeld verhielten.

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Fig. 1a–c Abb. 1a–c
Fig. 2a,b Abb. 2a,b
Fig. 3 Abb. 3
Fig. 4 Abb. 4

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Notes

  1. Altex Coatings, 215 Oropi Rd, Tauranga, New Zealand

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Author notes

  1. R. Meder

    Present address: School of Physical and Chemical Sciences, Queensland University of Technology, GPO Box 2434, 4001, Brisbane, Australia

  2. S. L. Codd

    Present address: Department of Chemical Engineering, Montana State University, PO Box 173920, Bozeman, Montana, USA

  3. P. T. Callaghan

    Present address: School of Chemical and Physical Sciences, Victoria University of Wellington, PO Box 600, Wellington, New Zealand

Authors and Affiliations

  1. New Zealand Forest Research Institute Limited, Private Bag 3020, Rotorua, New Zealand

    R. Meder & R. A. Franich

  2. Institute of Fundamental Sciences, Massey University, Private Bag 11-222, Palmerston North, New Zealand

    S. L. Codd & P. T. Callaghan

  3. School of Physical and Chemical Sciences, Queensland University of Technology, GPO Box 2434, 4001, Brisbane, Australia

    J. M. Pope

Authors
  1. R. Meder
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  2. S. L. Codd
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  3. R. A. Franich
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  4. P. T. Callaghan
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  5. J. M. Pope
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Corresponding author

Correspondence to R. Meder.

Additional information

The authors would like to thank Drs Rolf Booker and Shusheng Pang for valuable discussions during the course of this study. The work was conducted with financial assistance from the New Zealand Foundation for Research, Science and Technolgy.

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Meder, R., Codd, S.L., Franich, R.A. et al. Observation of anisotropic water movement in Pinus radiata D. Don sapwood above fiber saturation using magnetic resonance micro-imaging. Holz Roh Werkst 61, 251–256 (2003). https://doi.org/10.1007/s00107-003-0400-y

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