Abstract
A new apparatus was developed to directly measure water or oil absorption by papersheets as a function of contact time. Water and oil absorption volume by handsheets of various basis weights or degree of beating was measured by using this apparatus. The results showed that liquid absorption volume was strongly dependent on pore volume of handsheets made of pulps beaten to various degrees.Water retention value (WRV) of the papersheet was determined by applying the WRV measurement method for pulp to papersheet. An increase of interfiber void volume due to swelling was calculated as [Water absorption volume] - [Oil absorption volume] - [WRV of papersheet].For each paper sample made of hardwood bleached kraft pulp beaten to various degrees, this value was nearly equal to the oil absorption volume, which is regarded as the interfiber void volume of dried papersheet.
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