Investigation of the cellulose-water relationship by the pressure plate method

The water retention properties of papermaking fibers have been investigated by a "pressure plate" technique which permits measurement equilibrium moisture contents pulp samples at precisely controlled relative vapor pressures between 0.99 and 1.00. This range encompasses the interest in from table to middle drier section. Water isotherms are drawn satisfactorily related desorption reported literature. Isotherms for variety pulps reported. These show effects wood species, cooking method, yield, bleaching, drying, beating on cellulose-water relationship.