On the net refining energy and tensile development of nbsk pulp in a low consistency refiner
Srabon Salim and James Olson, University of British Columbia, Vancouver, BC, Canada
A series of Low Consistency (LC) refining trials was conducted using Northern Bleached Softwood Kraft (NBSK) pulp to study the tensile development using three operating variables, which are, (1) gap between the refinerís stator and rotor, (2) Refining speed, and (3) refiner bar geometry at 3% consistency. The trials were conducted varying one variable, while holding the other two variables constant. Both unrefined and refined pulp samples were collected at two points located before and after the refiner on a single pass. The samples were used to make hand-sheets followed by a series of measurements determining their tensile properties. This allowed a direct comparison among the operating variables and their effects on the tensile development. The result shows that both the refining energy and the tensile strength are the synergistic effect of the three variables used in the study. For a given consistency, there exists an optimum combination of the three variables contributing to the highest tensile strength.
Bleached pulp, Chemical fiber, Low Consistency Refiner, Softwood, Tensile
Nordic Pulp & Paper Research Journal (NPPRJ) is an international scientific magazine covering science and technology for the areas of wood or bio-mass constituents, pulp and paper and including new fiber-based materials, recovery and by-products from pulping processes, bio-refining and energy issues. Articles meeting required scientific standards are accepted from any continent. Open Access: Articles not available through Gold Open Access may be purchased by credit card as a pdf file, to be downloaded within 24 h after ordering, at a price of 22 EUR per article. (Value added tax may apply depending on your location, which you enter at payment logout.) Such articles have Green Open Access, i.e. authors may share articles on their personal non-commerical homepage immediately after publication on the website and download them to non-commercial hosting platforms one year after publication in a full issue of NPPRJ. ISSN: 0283-2631