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Characterisation of fines from unbleached kraft pulps and their impact on sheet properties
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Marie Bäckström
Veröffentlicht/Copyright:
1. Juli 2008
Abstract
Fines are an essential component in the papermaking process because they have a profound influence on the behaviour of the wet web and on the mechanical properties of the final sheet. Primary fines are present in the pulp prior to refining, and secondary fines are produced during refining. In the present investigation, two commercially manufactured unbleached pulps with kappa numbers of 45 and 90 were studied in terms of how they responded to refining with respect to the quality of fibre and fines. Primary and secondary fines were collected and characterised and their impact on sheet strength was evaluated by addition of known amounts to a refined and decrilled pulp. All the measured paper strength properties improved when primary and secondary fines were added. The strength improvement was generally somewhat higher in the second case. The effect was more pronounced at a higher level of addition. We attribute the main strength improvements associated with fines to improved consolidation by the creation of capillary forces between the surfaces.
Received: 2007-11-13
Accepted: 2008-3-7
Published Online: 2008-07-01
Published Online: 2008-07-01
Published in Print: 2008-09-01
©2008 by Walter de Gruyter Berlin New York
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Artikel in diesem Heft
- Original Papers
- Studies on the dehydrogenative polymerizations (DHPs) of monolignol β-glycosides: Part 4. Horseradish peroxidase-catalyzed copolymerization of isoconiferin and isosyringin
- Studies on the dehydrogenative polymerization of monolignol β-glycosides: Part 5. UV spectroscopic monitoring of horseradish peroxidase-catalyzed polymerization of monolignol glycosides
- Monolignol dehydrogenative polymerization in vitro in the presence of dioxane and a methylated β-β′ dimer model compound
- Structural characterization of milled wood lignins from different eucalypt species
- FTIR spectroscopy in combination with principal component analysis or cluster analysis as a tool to distinguish beech (Fagus sylvatica L.) trees grown at different sites
- Hydrothermal dissolution of mixed southern hardwoods
- Characterisation of fines from unbleached kraft pulps and their impact on sheet properties
- Effects of refining steam pressure on the properties of loblolly pine (Pinus taeda L.) fibers
- Elastic deformation mechanisms of softwoods in radial tension – Cell wall bending or stretching?
- Fiberboard bending properties as a function of density, thickness, resin, and moisture content
- Modification of Fagus sylvatica (L.) with 1,3-dimethylol-4,5-dihydroxyethylene urea (DMDHEU): Part 1. Estimation of heat adsorption by the isosteric method (Hailwood-Horrobin model) and by solution calorimetry
- Development of wooden block shear wall – Improvement of stiffness by utilizing elements of densified wood
- Significance of the heating rate on the physical properties of carbonized maple wood
- Exploring Scots pine fibre development mechanisms during TMP processing: Impact of cell wall ultrastructure (morphological and topochemical) on negative behaviour
- Pentachlorphenol migration from treated wood exposed to simulated rainfall
- Resistance of Trichoderma harzianum to the biocide tebuconazol – Proposed biodegradation pathways
- Short Notes
- On the variation of acid-labile aryl ether unit content in wood lignin
- Coumarins and secoiridoid glucosides from bark of Fraxinus rhynchophylla Hance
- Antifungal activities of heartwood extracts of Port-Orford cedar extractives
- Antifungal secoabietane dialdehyde and bisabolane-type terpenoids from the heartwood of Cryptomeria japonica D. Don
- Meetings
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Artikel in diesem Heft
- Original Papers
- Studies on the dehydrogenative polymerizations (DHPs) of monolignol β-glycosides: Part 4. Horseradish peroxidase-catalyzed copolymerization of isoconiferin and isosyringin
- Studies on the dehydrogenative polymerization of monolignol β-glycosides: Part 5. UV spectroscopic monitoring of horseradish peroxidase-catalyzed polymerization of monolignol glycosides
- Monolignol dehydrogenative polymerization in vitro in the presence of dioxane and a methylated β-β′ dimer model compound
- Structural characterization of milled wood lignins from different eucalypt species
- FTIR spectroscopy in combination with principal component analysis or cluster analysis as a tool to distinguish beech (Fagus sylvatica L.) trees grown at different sites
- Hydrothermal dissolution of mixed southern hardwoods
- Characterisation of fines from unbleached kraft pulps and their impact on sheet properties
- Effects of refining steam pressure on the properties of loblolly pine (Pinus taeda L.) fibers
- Elastic deformation mechanisms of softwoods in radial tension – Cell wall bending or stretching?
- Fiberboard bending properties as a function of density, thickness, resin, and moisture content
- Modification of Fagus sylvatica (L.) with 1,3-dimethylol-4,5-dihydroxyethylene urea (DMDHEU): Part 1. Estimation of heat adsorption by the isosteric method (Hailwood-Horrobin model) and by solution calorimetry
- Development of wooden block shear wall – Improvement of stiffness by utilizing elements of densified wood
- Significance of the heating rate on the physical properties of carbonized maple wood
- Exploring Scots pine fibre development mechanisms during TMP processing: Impact of cell wall ultrastructure (morphological and topochemical) on negative behaviour
- Pentachlorphenol migration from treated wood exposed to simulated rainfall
- Resistance of Trichoderma harzianum to the biocide tebuconazol – Proposed biodegradation pathways
- Short Notes
- On the variation of acid-labile aryl ether unit content in wood lignin
- Coumarins and secoiridoid glucosides from bark of Fraxinus rhynchophylla Hance
- Antifungal activities of heartwood extracts of Port-Orford cedar extractives
- Antifungal secoabietane dialdehyde and bisabolane-type terpenoids from the heartwood of Cryptomeria japonica D. Don
- Meetings
- Meetings
