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Published byKarina Keer Modified over 9 years ago
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Wood-fibre for future products from pulp Paul Kibblewhite
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Wood-fibre for papermaking The next 10 – 20 years
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Wall area Coarseness Number 1/(wall area x length) Width/thickness = Fibre collapse (in dried sheet) Perimeter/wall thickness 1/(Wood density) Collapse Fibre property interrelationships
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Softwood versus Hardwood fibres
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Furnish mix components Softwood fibres for reinforcement, runnability and robustness Hardwood fibres for bulk, surface & optical properties, and formation
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Eucalypt fibre selection for papermaking Plantation-grown species, hybrids and clones Short crop rotations at 5+ years Chip density about 550 kg/m³ High kraft pulp yield Target fibre coarseness, length and collapse resistance Target sheet bulk and tensile strength
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Globulus a premium eucalypt fibre-type
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Where to in short-term? Conventional breeding and propagation technologies Short crop rotations High forest productivity and disease resistance Emphasis on low cost, rapid propagation procedures, and screening tools Genetic modification of lower priority
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Softwood fibre-types
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Softwood pulp uniformity by fibre-type
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Northern is the premium softwood fibre-type Low coarseness long and slender High number Low MFA High hemicelluloses Low refining energy Long crop rotations
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Northern fibre-type from radiata pine How Do? Wood/chip segregation Pulp fractionation Conventional breeding, hybridisation and cloning Genetic modification
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Market kraft categories through wood/chip segregation
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“Rods and Ribbons” Pulp fractionation by fibre collapse
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Breeding for fibre quality Select for Low Fibre Coarseness while retaining or increasing Density and Length
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Coarseness Wood-fibre number
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Radiata pine fibre improvements in the short-term Wood/chip segregation Further advances limited Pulp fractionation by fibre collapse Yet to be achieved Genetic modification, and breeding for low coarseness Pulp mill is a residue user “Change” required for pulpwood regimes and fibre quality improvement
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Pulp-fibre for papermaking 50 years on! Who Knows? Today’s commodities Tissue, sanitary and packaging products, possibly OK Junk-mail, newsprint, communication and hard-copy, probably limited? Today’s specialty cement reinforcement pulp?
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Wood-fibre for future bio-products from pulp: A 50-year horizon
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Softwood and Eucalypt-type pulp- fibre 50 years on Short rotation pulpwood regimes (5 – 10 years) Highly uniform fibre property populations Earlywood- and latewood-type pulps Wide range of chemical and physical fibre- property combinations
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Many possible fibre property combinations 1. Separate EW & LW fibre populations
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2. Low or high coarseness rod-like fibre populations
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3. Four plus fibre-property combinations for future products from pulp
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Fibre property combinations Designer fibres through Purpose-grown, short-rotation crops for Sustainable designer products
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Fibre-property-combination research Genetic modification A critical success requirement Assay procedures to screen genotypes at the plantlet stage (3 months?)
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Back to Reality! Who pays? Fibre-property-combination research and development Product identification processes Fibre property combination selection and supply Product development Constraints Costs Sustainability, and product- and market-driven Green-house effect
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