Paper I
Flash-dried, unbleached softwood sulphate pulp and bleached abaca neutral
sulphite anthraquinone pulp sheets were used. The pulps were refined
separately in a Voith LR1 conical refiner, with a cutting angle of 60º and a
specific edge load of 3.0 Ws/m. The softwood pulp was refined at
240 kWh/ton and had a dewatering resistance of 27 SR. The abaca pulp was
refined at 46 kWh/ton and had a dewatering resistance of 20 SR. The refined
abaca pulp was dewatered and stored in a deep-freeze before use.