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1 Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology

1 2018

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The dynamics of moisture transfer in pine and beech wood in normal and low pressure conditions

Dobrowolska E., Karwat Z., Mielnik A.

Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology

2018

No. 104

130--138

This work studies the dynamics of moisture transfer during drying of elements made of pine sapwood and beech of various moisture contents at normal 0,10 MPa and low 0,03 MPa pressure, taking into account the anatomical cross sections. The analysis of the speed of moisture contents equalizing shows that much greater dynamics of moisture contents change take place in case of drying in 0,03 MPa than 0,10 MPa pressure, regardless of wood species or anatomical cross sections of samples. It is drying in vacuum that seems to be when moisture is given off by wood. Low moisture of the middle layers, compared with the outer layers, is difficult to equalize during drying. Also over drying of the outer layer of wood limits stable dynamics of moisture transfer, both during drying in normal pressure and in the vacuum.