Ultrastructure of commercial recycled pulp fibers for the production of packaging paper
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Jonas Brändström
Abstract
Transmission electron microscopy was used to investigate the ultrastructure of recycled pulp fibers originating from a household collection plant and intended for the production of packaging paper. Three recovered paper grades and recycling processes, including pulping, screening, cleaning and refining, were assessed with emphasis on surface and internal fibrillation as well as xylan localization. Results showed a large heterogeneity with respect to fiber ultrastructure within and between the grades. Screening and cleaning steps had no detectable effects, but refining clearly increased cell-wall delamination and surface fibrillation. Immunolabeling of xylans showed that they were distributed rather evenly across the cell walls. They were also present on fines. Two different mechanisms for fiber delamination and surface fibrillation were found, one which implies that internal and external fibrillation take place simultaneously across the cell wall, and another which implies successive peeling of layers or sub-layers from the outside towards the inside. It is suggested that recycled fibers of chemical pulp origin undergo the former mechanism and recycled fibers that contain lignin binding the cell wall matrix give rise to the latter peeling mechanism. Because several recycled fibers were severely delaminated and almost fractured, we suggest that to produce a good packaging paper, it is important that recycled pulp should contain a significant proportion of fibers with high intrinsic strength.
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©2005 by Walter de Gruyter Berlin New York
Articles in the same Issue
- Contents
- Species index (scientific names)
- Subject Index
- Acknowledgement
- Author Index
- Ultrastructural changes in a holocellulose pulp revealed by enzymes, thermoporosimetry and atomic force microscopy
- Development of wet strength additives from wheat gluten
- Characterization of electrolyzed magnesium spent-sulfite liquor
- Molecular weight-functional group relations in softwood residual kraft lignins
- Structure-activity relationships of cadinane-type sesquiterpene derivatives against wood-decay fungi
- Effect of water on wood liquefaction and the properties of phenolated wood
- Effect of wood species and molecular weight of phenolic resins on curing behavior and bonding development
- Contact-free measurement and non-linear finite element analyses of strain distribution along wood adhesive bonds
- Comparison between HT-dried and LT-dried spruce timber in terms of shape and dimensional stability
- Physical properties of earlywood and latewood of Pinus radiata D. Don: Anisotropic shrinkage, equilibrium moisture content and fibre saturation point
- Effect of stress levels on compressive low-cycle fatigue behaviour of softwood
- Comparison of morphological and chemical properties between juvenile wood and compression wood of loblolly pine
- Ultrastructure of commercial recycled pulp fibers for the production of packaging paper
- Oxalate regulation by two brown rot fungi decaying oxalate-amended and non-amended wood
- Pine and spruce roundwood species classification using multivariate image analysis on bark
- Detection and species discrimination using rDNA T-RFLP for identification of wood decay fungi
- Personalia
- Award presentation on the occasion of the 13th International Symposium on Wood, Fibre and Pulping Chemistry, May 16–19, 2005, Auckland, New Zealand
- NMR studies on Fraser fir Abies fraseri (Pursh) Poir. Lignins
Articles in the same Issue
- Contents
- Species index (scientific names)
- Subject Index
- Acknowledgement
- Author Index
- Ultrastructural changes in a holocellulose pulp revealed by enzymes, thermoporosimetry and atomic force microscopy
- Development of wet strength additives from wheat gluten
- Characterization of electrolyzed magnesium spent-sulfite liquor
- Molecular weight-functional group relations in softwood residual kraft lignins
- Structure-activity relationships of cadinane-type sesquiterpene derivatives against wood-decay fungi
- Effect of water on wood liquefaction and the properties of phenolated wood
- Effect of wood species and molecular weight of phenolic resins on curing behavior and bonding development
- Contact-free measurement and non-linear finite element analyses of strain distribution along wood adhesive bonds
- Comparison between HT-dried and LT-dried spruce timber in terms of shape and dimensional stability
- Physical properties of earlywood and latewood of Pinus radiata D. Don: Anisotropic shrinkage, equilibrium moisture content and fibre saturation point
- Effect of stress levels on compressive low-cycle fatigue behaviour of softwood
- Comparison of morphological and chemical properties between juvenile wood and compression wood of loblolly pine
- Ultrastructure of commercial recycled pulp fibers for the production of packaging paper
- Oxalate regulation by two brown rot fungi decaying oxalate-amended and non-amended wood
- Pine and spruce roundwood species classification using multivariate image analysis on bark
- Detection and species discrimination using rDNA T-RFLP for identification of wood decay fungi
- Personalia
- Award presentation on the occasion of the 13th International Symposium on Wood, Fibre and Pulping Chemistry, May 16–19, 2005, Auckland, New Zealand
- NMR studies on Fraser fir Abies fraseri (Pursh) Poir. Lignins
