Paper structure modeling with particle-level process simulation
2006 (English)In: Progress in Paper Physics Seminar, 2006Conference paper, Abstract (Other academic)Text
Print quality is highly dependent on the interactions of paper, ink and printing plate at the length scales of half-tone dot size and floc size. Knowledge of the details of the micro-structure is needed to predict these interactions, but it is difficult to obtain experimentally. One way to recreate the micro-structures of paper and to gain understanding of the mechanisms behind their formation is to systematically model each unit process of papermaking at particle level. The output of such simulations is numerical descriptions of the three-dimensional paper structure, from which any structural data can be accessed. Consequently, the simulations relate process parameters and particle properties directly to the micro-structures of paper. Many characteristics of the fiber network structure and the distribution of fillers and fines are determined in the headbox and during drainage in the forming section. A model for fiber suspensions, which couples the Navier-Stokes equations to a mechanical model of discretely represented flexible fibers, has been developed. Its performance allows for the study of large particle systems at very high Reynolds numbers (20000 particles at Re=40000), which is enough to model the conditions prevalent in the forming section of a modern paper machine.
Place, publisher, year, edition, pages
Paper, Pulp and Fiber Technology
IdentifiersURN: urn:nbn:se:liu:diva-125219OAI: oai:DiVA.org:liu-125219DiVA: diva2:903610
Progress in Paper Physics Seminar