The effects of beating-degree, lignin content and heating condition upon the vapour absorbing properties of paper were investigated.
(1) The moisture content of paper slightly increases with the increase of beating-degree, while the diffusion coefficient of water vapour decreases.
(2) L. B. K P contains large amount of pentosan, but its moisture content is comparatively small.
(3) Both the moisture content and the diffusion coefficient remarkably increase with the increase of lignin content.
Between the moisture content and the lignin content, the following experimental equation exists :
M=0.1033X+9.633
where, M is the moisture content (%) at 65% RH, 20°C, and X is lignin content (%).
(4) The moisture content remarkably decreases with the increase of heating temperature and time.