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You are here : Home > Training > EFPG Days > 6- Effect of wood species mixtures on Kraft pulping (slides 9-16)

Last update : July 22, 2003

			Second Session : The yield issue
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					VI - Effect of wood species mixtures on Kraft pulping (slides 9-16) Christine Deleuze, Denilson Da Silva Perez, Michaël Lecourt (AFOCEL)

	9 - Application to pulp and paper technology     Softwood or hardwood mixture in kraft cooking   Hardwood species:   Softwood species: Beach + Poplar Douglas + Norway Spruce Oak Chestnut Scot Pine Maritime Pine   Properties analyzed: pulp yield

	10 - Pulp Yield: Hardwood mixtures Mix: Beech + Poplar Oak                 Chestnut PYield18 = 53.89 P + 52.34 B + 46.35 O + 7.72 P*B + 6.58 P*O + 8.15 H*O PYield18 = 83.92 P + 52.18 B + 46.35 C   74% variability explained 67% variability explained Kappa = 18

	11 - Pulp Yield: Softwood mixtures Mix: Douglas + Norway Spruce Scott Pine                 Maritime Pine PYield = 15 + 4.1*(7.3932 SP + 8.0449 DO + 8.9802 NS + 3.4947 SP*DO - 1.9631 SP*NS + 1.0334 DO*NS) PYield = 15 + 4.1*(7.050 MP + 8.0449 DO + 8.9802 NS - 0.4251 MP*DO + 3.0598 MP*NS + 1.0334 DO*NS) 82.14% variability explained 82.14% variability explained Kappa = 40

	12 - Addition of 10% of Scott or Maritime Pine Evolution of pulp yield for a mix constituted of 10% pine and 90% of different proportions in Douglas and Norway Spruce

	13 - Other measured properties   Fibers morphology   Paper properties:     Physical properties   COD / BO   Process parameters:   Liquor consumption				14 - Evolution of morphological properties Maritime Pine - Douglas - Norway Spruce Variable Variance explained Model equation Best proportions Fibre length (µm) 56.53% 2348.65 NS+2280.65 DO + 2165.9 MP Spruce Fibre width (µm) 92.10% 34.6644 NS +32.05021 DO + 37.89889 MP + 3.12793 NS*DO -3.2067 EP*MP+2.36293 DO*MP Maritime Pine Coarseness (mg/m) 84.81% 0.27252 NS + 0.2782 DO + 0 .36156 MP + .22143 NS*DO + .20616 NS*MP + .08152 DO*MP - 1.39924 NS*DO*MP 30% NSpruce 70% Mar. Pine

	15 - Outlooks   Impact of sample origin:   Country   Storage conditions   Applications to Kraft cooking & to TMP process:   Energy saving   Use of new mixtures				16 - Conclusions   Scheffé Diagram   Fast method, simple   Graphic representation   BUT results highly influenced by sampling method   Results: better pulp and paper properties   Pulp yield   Paper physical properties   Pulp fibers morphological properties   Possibility of other models forms based on physical or chemical theory and knowledge

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