Papermaking properties of the ECF-bleached kraft pulps from first-thinning Scots pine (Pinus sylvestris L.)
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Riikka Rautiainen
Abstract
First-thinning Scots pine (Pinus sylvestris) and the outer (containing long fibers) and inner (containing short fibers) parts of its stem wood were delignified on a laboratory scale by kraft pulping followed by oxygen-alkali delignification and bleaching with D0(EO)D1(EP)D2. The aim was to evaluate the potential use of the bleached pulps as reinforcing material in various mechanical and chemical pulps. The physical and optical properties of the pulps indicated that only the “outer part pulp”, with rather similar properties to those of a reference softwood kraft pulp, seemed suitable for this purpose. In contrast, materials from first-thinning stem wood and its inner part resulted in lower yields as early as the kraft pulping stage. Rather mediocre strength properties were obtained, but the bleached kraft pulps prepared from the two first thinning-based materials had good optical properties.
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©2007 by Walter de Gruyter Berlin New York
Artikel in diesem Heft
- MWL fraction with a high concentration of lignin-carbohydrate linkages: Isolation and 2D NMR spectroscopic analysis
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Artikel in diesem Heft
- MWL fraction with a high concentration of lignin-carbohydrate linkages: Isolation and 2D NMR spectroscopic analysis
- Papermaking properties of the ECF-bleached kraft pulps from first-thinning Scots pine (Pinus sylvestris L.)
- Syntheses and properties of liquefied products of ozone treated wood/epoxy resins having high wood contents
- Quality control of thermally modified timber: Interrelationship between heat treatment intensities and CIE L*a*b* color data on homogenized wood samples
- Violet light causes photodegradation of wood beyond the zone affected by ultraviolet radiation
- Dynamic mechanical analysis of dry wood: Linear viscoelastic response region and effects of minor moisture changes
- Material properties and their interrelation in chemically modified clear wood of Scots pine
- Effect of treatments with 1,3-dimethylol-4,5-dihydroxy-ethyleneurea (DMDHEU) on the tensile properties of wood
- Penetration of amino-silicone micro- and macro-emulsions into Scots pine sapwood and the effect on water-related properties
- Search for a relationship between stress wave velocity and internal stresses in eucalypts and radiata pine
- Kiln-drying lumber quality of hybrid poplar clones
- Heat and mass transfer in wood composite panels during hot pressing: Part 3. Predicted variations and interactions of the pressing variables
- Heat and mass transfer in wood composite panels during hot pressing: Part 4. Experimental investigation and model validation
- Dielectric relaxation of water adsorbed on wood and charcoal
- Properties of piezoelectric voltage considering the microscopic structure of wood cell walls
- Adjusting for fibre length-biased sampling probability using increment cores from standing trees
- External and internal fungal flora of pine sapwood (Pinus sylvestris L.) specimens in above-ground field tests at six different sites in south-west Germany
- Award Presentation on the occasion of the European Workshop on Lignocellulosics and Pulp (EWLP 2006) in Vienna
- Phenolic compounds in silver birch (Betula pendula Roth) wood
