3D network simulations of paper structurewith fines and fillers
2012 (English)In: Nordic Pulp and Paper Research Journal, ISSN 0283-2631, Vol. 27, no 2, 256-263 p.Article in journal (Refereed) Published
The structure of paper influences its properties and simulations of it are necessary to understand the impact of fiber and papermaking conditions on the sheet properties. We show a method to develop a representative structure of paper by merging different simulation techniques for the forming section and the pressing operation. The simulation follows the bending and drape of fibers over one another in the final structure and allows estimation of sheet properties without recourse to arbitrary bending rules or experimental measurements of density and/or RBA. Fibers are first modeled as jointed beams following the fluid mechanics in the forming section. The sheet structure obtained from this is representative of the wet sheet from the couch. The pressing simulation discretizes fibers into a number of solid elements around the lumen. Bonding between fibers is simulated using spring elements. The resulting fiber network was analyzed to determine its elastic modulus and deformation under small strains. The influence of fiber dimensions, namely fiber lengths, widths and thicknesses as well as bond stiffnesses on the elasticity of the network are studied. A brief account of inclusion of fines, represented by individual cubical elements is also shown.
Place, publisher, year, edition, pages
2012. Vol. 27, no 2, 256-263 p.
Paper, Pulp and Fiber Technology
IdentifiersURN: urn:nbn:se:liu:diva-79341DOI: 10.3183/NPPRJ-2012-27-02-p256-263ISI: 000315696000012OAI: oai:DiVA.org:liu-79341DiVA: diva2:540718