Nonwood pulp constituents Part Ⅰ - The effect on pulp and paper properties

摘要

Nonwood furnish is a more heterogeneous material than furnish made of wood, because of the wide variety of different cells in nonwood material. The nature of the material affects both pulping and papermaking processes as well as paper quality, and therefore it is important to optimise fibre properties prior to papermaking. Improvement of nonwood fibre properties requires more detailed information about the behaviour of different cell types in papermaking. To evaluate the effects of different cell types on paper quality, a fractionation study was performed. It was concluded that parenchyma and epidermis cells have an important effect on pulp and paper functionality. Even though fines impair dewatering and tear properties, only partial removal of the fines fraction can be recommended, since fines have a positive impact on optical properties and in some pulp types on several tensile properties also.