Drying cost and energy demand can be 16% less for fiber-wall-filled pa
pers, since these papers contain less moisture after pressing than the
ir conventionally filled counterparts. The enhanced drainage character
istics of the fiber-wall-filled fibers are a consequence of the lower
absorbency, moisture content after pressing, water retention values, a
nd higher CSF. The location of calcium carbonate within the cell walls
of never-dried fibers therefore offers potential savings in energy an
d costs for paper mills.