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2013
ACL
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A.Dupleix, D.De Sousa Meneses, M.Hughes, R.Marchal, 'Mid-infrared absorption properties of green wood', Wood Sci. Technol. 47 1231-1241 (2013) doi:10.1007/s00226-013-0572-5
There is a lack of quantitative data on the penetration depth and the
amount of energy absorbed by green wood under infrared (IR) radiation. This lack of
knowledge is a potential barrier to the development of IR heating as an alternative to
soaking as a means of warming logs prior to peeling in the manufacture of plywood.
Experimental measurements of normal hemispherical spectral reflectance and
transmittance over the range 550–5,500 cm-1 wavenumbers on four wood species,
beech, birch, Douglas-fir and spruce have brought new knowledge on mid-infrared
absorption properties of green wood and removed some uncertainties. For instance, it
is not possible to deliver energy deeper than up to 0.3 mm below the wood surface
because 70–90 % of all incident IR radiation on the wood surface is absorbed in this
layer. Some wood features, such as surface quality, the presence of knots and of free
water in wood (the latter two having a more significant effect) influence the amount
of energy absorbed. These results illustrate that IR radiation can heat the surface
layers, but then heat penetrates deeper into the inside layers of wood by conduction.
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