The effect of drying schedule on the radial permeability ofPinus radiata D. Don

Booker, R. E.; Evans, J. D.

doi:10.1007/bf02615211

Cited by 31 publications

(14 citation statements)

References 3 publications

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“…Figure 4a depicts the variation of practical shrinkage strain between the tangential and radial directions. As this figure shows, at the same moisture content level, the tangential practical shrinkage strain was higher than in a radial direction at each position; this could be attributed to the higher permeability and moisture flow in the radial direction [19,20]. At 26% moisture content, the difference of practical shrinkage strain between the tangential and radial directions was not sharp, but it increased with a decrease in moisture content.…”

Section: Difference Of Shrinkage Ratios Between the Tangential And Ramentioning

confidence: 79%

Variation of Drying Strains between Tangential and Radial Directions in Asian White Birch

Zhao

Yeli

et al. 2016

Forests

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Abstract:In this study, wood disks of 30 mm in thickness cut from white birch (Betula platyphylla Suk) logs were dried at a constant temperature (40˝C). The drying strains including practical shrinkage strain, elastic strain, viscoelastic creep strain and mechano-sorptive creep were measured both tangentially and radially. The effects of moisture content and radial position on each strain were also discussed qualitatively. Overall, the difference of the practical shrinkage strain between the tangential and radial directions was proportional to the distance from the pith. The tangential elastic strain and viscoelastic creep strain were higher than these strains in a radial direction, and they all decreased with the decrease of moisture content. Additionally, there were opposite mechano-sorptive creep between tangential and radial directions.

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Section: Difference Of Shrinkage Ratios Between the Tangential And Ramentioning

confidence: 79%

Variation of Drying Strains between Tangential and Radial Directions in Asian White Birch

Zhao

Yeli

et al. 2016

Forests

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“…According to Comstock and Côté (1968), permeability decreases with higher temperature; the main reason for this is due to pit aspiration. In the meantime, HTD may cause the flow and redistribution of extractives in the specimens, which also has a significant effect on wood permeability (Booker, 1990;Booker and Evans, 1994). That is, on the one hand, it may decrease the blockage of the flow path, occlude the liquid flow path and thus decrease the radius and number of effective capillaries.…”

Section: Pit Aspiration Ratio Of Wood After Three Drying Treatmentsmentioning

confidence: 97%

Effect of different drying methods on liquid penetration of Chinese fir plantation wood

Jiang

Zhao

et al. 2007

Front. Forest. China

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On the other hand, plantation-grown Chinese fir is really a refractory species. Usually, it requires very high pressure to impregnate the wood with chemicals or resins, while the high pressure could result in damage and deformation of the wood. It has been reported that liquid permeability varies depending on drying methods and that pre-or post-treatments could improve permeability (Matsumura et al., 1995a(Matsumura et al., , 1995b(Matsumura et al., , 1996Zhao et al., 2003), but few reports were found with respect to the effect of different drying methods on liquid penetration of wood. Therefore, to understand the mechanism of drying methods on liquid penetration of plantation-grown Chinese fir is a key project to make high quality, solid wood products from this species through various chemical impregnation treatments. This paper comprises a comparative study on the effect of radio frequency/vacuum drying (RFVD), conventional kiln drying (KD) and high temperature drying (HTD) on the liquid penetration of Chinese fir plantation wood. Materials and methods MaterialsFifteen Chinese fir (Cunninghamia lanceolata (Lamb.) Hook.) plantation-grown trees were cut in Jiangxi Province. Under the same planting condition, five rapidly grown trees were selected (diameter of breast height (DBH)>25 cm), five trees grown at a medium speed (23 cm

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“…Slower rates determined for the radial specimens ( Fig. 11) are an expected trend because permeability and moisture flow are higher in the radial direction [27][28][29] (which is the direction of drying for tangential cut specimens). It seems that an increase in temperature determined a proportional increase of the shrinkage rate for extrapolations to 0% moisture content:…”

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confidence: 90%

Modeling Shrinkage Response to Tensile Stresses in Wood Drying: I. Shrinkage-Moisture Interaction in Stress-Free Specimens

2009

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This article reports on the wood shrinkage during drying in relationship with the temperature and moisture content. All tests were performed perpendicular to the grain on small clear wood specimens of green Western hemlock while drying at 40, 60, and 80 C to 17, 11, and 5% final moisture contents. Overall, wood dimensional changes and moisture loss phenomena were successfully analyzed and interpolated. The shrinkage strain followed a nonlinear pattern with the moisture loss being the driving force and exhibited good correlation with the square value of moisture content in tangential, and linear moisture values could be used to describe shrinkage in radial direction. Both shrinkage intersection points and end of capillary water values increased with temperature; the distinction between the two values could not be made at all times. A nonlinear function containing two regression coefficients (a and b) was found to be a good interpolation of the moisture loss experimental data. Further analyses revealed that b is independent of both target moisture content and temperature, whereas a appears to be influenced by both variables. The correlation between shrinkage and moisture loss rate is intended to be used as a stress prediction tool.

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The effect of drying schedule on the radial permeability ofPinus radiata D. Don

Cited by 31 publications

References 3 publications

Variation of Drying Strains between Tangential and Radial Directions in Asian White Birch

Variation of Drying Strains between Tangential and Radial Directions in Asian White Birch

Effect of different drying methods on liquid penetration of Chinese fir plantation wood

Modeling Shrinkage Response to Tensile Stresses in Wood Drying: I. Shrinkage-Moisture Interaction in Stress-Free Specimens

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