Abstract
Wet cores, recently observed in highly collapsed boards towards the end of pre-drying, suggest that a previously unobserved relationship between collapse and the rate of internal moisture diffusion may exist. In this study, a drying model has been used to fit the diffusion coefficient and other model parameters to the drying data from the earlier study. The model parameters were fitted to six sub-samples from 20 sample boards (a total of 120 sub-samples). The model was only fitted to the drying data from green to 50% average moisture content. An inter-relationship between basic density, collapse and the fitted diffusion coefficient was established and discussed. It is suggested that the effect of collapse on diffusion coefficient could be the result of two different mechanisms.
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