Updated: 2012-08-02

Collin Hiia, Øyvind W. Gregersena, Gary Chinga Carrascob, Øyvind Eriksenb and Kai Tovenb

a Department of Chemical Engineering, Norwegian University of Science and Technology, 7491 Trondheim, Norway

b Paper and Fibre Research Institute, 7491 Trondheim, Norway

This study shows that wet-pressing TMP and DIP with a shoe press pulse may yield similar afterpress solids, provided that an adequate shoe pulse length with similar pressure profile is applied. A wet web with more porous structure in the sheet dewatering (felt) layer seems to contribute to the increased dewatering during wet pressing. In addition, a shoe press pulse with high peak pressure at the end yields higher solids content after wet-pressing and higher bulk compared to a pulse with a peak pressure in the beginning. The increased dewatering during wet-pressing implies a reduction of steam consumption in the dryer.

Nordic Pulp and Paper Research Journal 27(4): 798-805.