Improving the combinations of critical properties and process parameters of printing and writing papers and paperboards by new paper-filling methods

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en Silenius, Petri 2012-01-24T14:36:29Z 2012-01-24T14:36:29Z 2003-02-14
dc.identifier.isbn 951-22-6281-9
dc.identifier.issn 1237-6248
dc.description.abstract The present study focused on improving the property combinations of printing and writing papers that become critical when lowering grammage. The target was to clarify whether improved combinations can be achieved through structuring precipitated pigments, pulps, and pulp fines in a new way. A kinetic model for diffusion of ions within the fiber wall was developed and used to interpret data from diffusion experiments in order to clarify the limitations of fiber loading, which was also briefly studied. Fiber loading, however, failed to provide paper with adequate properties. A new composite filler produced by precipitating calcium carbonate on pulp fines (SuperFill) was introduced and a mechanism for the paper filler suggested. Based on the diffusion coefficients obtained and a general knowledge of crystallization, it can be concluded that the tendency of calcium carbonate to precipitate into the lumen or deeper within the fiber wall during fiber loading is minor, when precipitation is performed for birch fibers using the reaction between calcium hydroxide and carbon dioxide. Consequently, fiber loading did not offer significant benefits compared with fillers added normally to the stock. SuperFill provided paper with a significantly improved combination of light scattering coefficient and strength compared with fillers added normally to the stock. The proposed mechanism for SuperFill consists of three elements. First, SuperFill provides paper with a more uniform spatial filler distribution with reduced agglomeration, which may contribute to paper light scattering coefficient through the combined effect of the pigment itself, interruption of the fiber bonded area, and reduced fines collapse. Second, the fines component of SuperFill most probably contributes to increased activation through enhanced bonding, resulting in increased paper strength. Third, it was shown that SuperFill influences paper in such a way that a more optimum pore structure with respect to paper light scattering is achieved. The combination of formation and retention was also improved with SuperFill. The economic value of SuperFill technology was estimated to be considerable. en
dc.format.extent 129, [28]
dc.format.mimetype application/pdf
dc.language.iso en en
dc.publisher Helsinki University of Technology en
dc.publisher Teknillinen korkeakoulu fi
dc.relation.ispartofseries Reports / Helsinki University of Technology, Laboratory of Paper Technology. Series A en
dc.relation.ispartofseries 14 en
dc.subject.other Paper technology en
dc.title Improving the combinations of critical properties and process parameters of printing and writing papers and paperboards by new paper-filling methods en
dc.type G4 Monografiaväitöskirja fi
dc.description.version reviewed en
dc.contributor.department Department of Forest Products Technology en
dc.contributor.department Puunjalostustekniikan osasto fi
dc.subject.keyword paper properties en
dc.subject.keyword printing paper en
dc.subject.keyword writing paper en
dc.subject.keyword paper filling en
dc.subject.keyword pulp fines en
dc.subject.keyword pigments en
dc.subject.keyword fiber loading en
dc.subject.keyword composites en
dc.subject.keyword fillers en
dc.subject.keyword ion diffusion en
dc.subject.keyword calcium carbonate en
dc.subject.keyword kinetic models en
dc.identifier.urn urn:nbn:fi:tkk-000213
dc.type.dcmitype text en
dc.type.ontasot Väitöskirja (monografia) fi
dc.type.ontasot Doctoral dissertation (monograph) en
dc.contributor.lab Laboratory of Paper Technology en
dc.contributor.lab Paperitekniikan laboratorio fi

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