Filling Wet Paper with the Use of a Secondary Headbox

Pilot-scale trials on slow and fast Fourdrinier paper machines have shown that a sheet can be filled with clay and calcium carbonate by passing a concentrated filler suspension through a wet sheet. The suspension was supplied from a secondary headbox located at the dryline. The trials showed that no...

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Bibliographic Details
Published in:Industrial & engineering chemistry research 2004-04, Vol.43 (9), p.2280-2286
Main Authors: van de Ven, Theo G. M, Vanerek, Alois, Garnier, Gil
Format: Article
Language:English
Subjects:
Applied sciences
Chemical engineering
Exact sciences and technology
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Summary:Pilot-scale trials on slow and fast Fourdrinier paper machines have shown that a sheet can be filled with clay and calcium carbonate by passing a concentrated filler suspension through a wet sheet. The suspension was supplied from a secondary headbox located at the dryline. The trials showed that no damage to the sheet occurs when the filler suspension is applied to the wet sheet. At low filler concentrations, an uneven distribution of filler in the sheet was observed in the z direction, but at high filler levels, the unevenness in filler distribution decreased. The strength of the paper decreased with increasing filler concentration, as is the case in conventionally filled paper. Aside from fillers, other chemicals can be retained by this process as well. Polyethylene imine (PEI) showed an increase in the dry strength of paper on the slow Fourdrinier machine, but not on the fast one. The main advantage of this method is that the filling process can be completely separated from the wet-end chemistry.
ISSN:0888-5885
1520-5045
DOI:10.1021/ie034203i