Drying Temperature and Hornification of Industrial Never-Dried Pinus radiata Pulps. 1. Strength, Optical, and Water Holding Properties

摘要: Hornification and changes in properties of bleached Pinus radiata pulps were studied for oven-dried compared to never-dried pulps. Evaluation unrefined PFI-refined showed an increase strength loss with high drying temperature. The tensile index was reduced by 40 55%, the tear 14 31%, degree hornification, measured as WRV, increased from 25 34% when temperature °C 130 °C. stiffness index, Scott bond, elongation reduced, whereas bulk, opacity, air permeability, light scattering values at temperatures. Neither fiber deformations nor damages observed justify such reductions properties. In PFI refining, dried required three times more revolutions than develop until 70 Nm/g. Dried found have less capability hold water into fibers’ pore structure, shown retention value. Changes value suggested that besides irreversible closure fibril microfibril aggregation, delamination can contribute