Pilot scale trials on a slow and a fast Fourdrinier paper machine 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 distribution was even. The strength of the paper decreased with filler concentration as is the case in conventionally filled paper, Besides 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, 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.
|Number of pages||6|
|Publication status||Published - 20 Nov 2003|
|Event||5th International Paper and Coating Chemistry Symposium 2003 - Montreal, Canada|
Duration: 16 Jun 2003 → 19 Jun 2003
|Conference||5th International Paper and Coating Chemistry Symposium 2003|
|Period||16/06/03 → 19/06/03|