Abstract
Liquid transfer and dynamic penetration as well as their relationships to roughness of papers, such as softwood and hardwood bleached sulphate pulp sheets and commercial india and coated papers, were investigated.As smoothness of paper surface increased, the initial liquid transfer and absorption volume decreased. The amount of water transfered at the contact time 0, which could be obtained by extrapolation from the relationship between liquid transfer and contact time, might be interpreted as the roughness index Kr'. This became smaller when the void volume on the paper surface decreased. Moreover, the thickness of water layer and its volume ratio to that of void on the paper surface at the initial stage were calculated as 11.1 μm and 46% for the softwood bleached sulphate sheet, 9.6μm and 54% for the hardwood sheet, 8.8 μm and 41% for the india paper and 1.8μm and 16% for the coated paper, respectively.
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