Search for dissertations about: "pulp"

Showing result 11 - 15 of 755 swedish dissertations containing the word pulp.

  2. 11. Pulp displacement washing - An investigation of the influence of fibre and bed properties using a novel measurment technique

    Author : Jenny Lindau; Chalmers tekniska högskola; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; displacement washing; pulp properties.; measurement technique; compression; dispersion; fibre damage; local properties; kraft pulp;

    Abstract : There are many incentives for making the pulp washing process as efficient as possible: an efficient separation of the pulp from the black liquor will increase energy efficiency, reduce costs by minimizing the need for make-up chemicals and improve the bleaching process. Research in this area has, however, been more or less neglected and in the existing literature there are many discrepancies as to how different parameters influence the washing process. READ MORE

  4. 12. Characterization of chemical pulp fiber surfaces with an emphasis on the hemicelluloses

    Author : John Sjöberg; KTH; []
    Keywords : adsorption; analytical pyrolysis; capillary electrophoresis; carbohydrate; chemical pulp; ECF pulp; enzymatic hydrolysis; fibre surface; hardwood; hemicellulose; hexenuronic acid; kraft pulp; molecular weight distribution; peeling; residual lignin; s;

    Abstract : .... READ MORE

  5. 13. Flow and Mixing of Pulp Suspensions

    Author : Johan Pettersson; Chalmers tekniska högskola; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; flow behaviour; boundary-layer; Medium Consistency MC ; mixing; yield stress; suspension; pulp; Laser Doppler Anemometry LDA ; turbulence; fibre;

    Abstract : When producing pulp and paper, pulp suspensions are treated in a number of unit operations at medium consistency (MC) concentrations (3-15% by weight). Pulp suspensions at these concentrations behave as solids at low shear rates, but at sufficiently high shear rates they start to flow and can even be made to act as water. READ MORE

  6. 14. Displacement Washing in the Sulfate Pulp Mill

    Author : Gunnar Eriksson; Chalmers tekniska högskola; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; metal ions; Kraft pulp; models; diffusion; filter cakes; sorption; temperature; lignin; fibers; washing; lime mud; chemical recovery; displacement; pulp washing;

    Abstract : Displacement washing is an operation in which it is possible to wash solid-phase particles with a minimum of water. In a sulfate pulp mill, the main application is the pulp washing, but lime mud washing also occurs in the chemical recovery. The washing consumes a great deal of water. READ MORE

  7. 15. Mechanical Pulp. Effects of Pretreatment and Wood Source on Fiber Separation and Pulp Properties

    Author : Lars Johansson; Chalmers tekniska högskola; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; torsional stress; pulp properties; chips; impregnation; screw press; SEM; mechanical pulp; sulfonation; shear stress; fracture surface; wood quality; temperature;

    Abstract : The work presented in this thesis concerns the mechanical pulping process and the effects of wood source and pretreatment conditions on the pulp properties. In the first part, the deformation of Norway spruce (Picea abies) wood samples was investigated under shear and torsional loading at different temperatures (20-95°C) and sulfonation conditions. READ MORE