Pulp-filler interaction. (1). The influence of fines on the structure and properties of filler loaded papers
填料とパルプの相互作用 I 微細繊維の影響

Toru Katsura, Koji Murakami
The influence of fines-filler interaction on the structure and properties of paper was investigated. The fines used in this investigation were collected between 100 mesh and 300 mesh screens from hardwood kraft pulp (450 ml c.s.f.). The filler used was a precipitated calcium carbonate. The results are summerized as follows: (1) Raycells, fragments of both fibers and vessel elements, and fibrils separated from the fiber wall are contained in the fines fraction. (2) The z-directional width and
more » ... a of filler aggregates for sheets with fines added are lager than those for sheets containing only fibers. However, the z-directional count and area fraction of filler aggregates are not affected by fines addition. The rate of increase in the light scattering coefficient is not affected by the presence of fines. (3) The z-directional count and area fraction of filler aggregates in sheets are lager when the fines and filler are coflocculated than when the fines and preflocculated filler are added sequentially. Higher light scattering coefficients are also obtained for sheets with fines and filler coflocculated. The results of sheet surface inspection with SEM show that in a coflocculated sheet the filler tends to form aggregates around fibrils and that fibrils are detached from fiber walls. This fibril detachent is thought to contribute to the higher light scattering coefficient of these sheets.
doi:10.2524/jtappij.41.724 fatcat:xcrhztzsgbfllgqqg2gutyokga