Essays about: "Pulp fibre"

Showing result 16 - 20 of 27 essays containing the words Pulp fibre.

  1. 16. The Effect of Different Xylan Contents on the Strength Properties of Softwood Kraft pulp

    University essay from Karlstads universitet/Fakulteten för teknik- och naturvetenskap

    Author : Maria Svedinger Andersson; [2013]
    Keywords : Xylan; Glucomannan; strength; pulp; cooking; xylan content; hemucellulose; mild cook;

    Abstract : The aim of this Master thesis was to investigate if the xylan content had any influence on the physical properties of softwood kraft pulps. To achieve pulps with different xylan content different kraft cooking conditions were used; two different temperatures and two different effective alkali levels. READ MORE

  3. 17. The origin of fibre charge in chemical pulp

    University essay from KTH/Skolan för kemivetenskap (CHE)

    Author : Pär Lindén; [2013]
    Keywords : Hardwood kraft pulp; Eucalyptus; Uronic acid; Lignin; Total charge; Carboxylic groups; Conductometric titration; Methanolysis; Acid hydrolysis; Kappa number;

    Abstract : Chemical components in wood contain multiple anionic groups, including carboxyl groups and hydroxyl groups. During kraft cooking and bleaching, such structures are also formed, degraded or modified by the action of reactions both deliberate and unwanted. It has previously been found by Laine that anionic groups with pKa values of 3.3 and 5. READ MORE

  4. 18. Effect of fiber on physiochemical properties of digesta and fecal microbial composition in pigs

    University essay from SLU/Dept. of Animal Nutrition and Management

    Author : Amirsam Banino; [2012]
    Keywords : Pigs; Dietary fiber; Pectin; Arabinoxylan; Gut microbiota; Gut environment;

    Abstract : This study was conducted to investigate the effects of different dietary fiber sources on physicochemical properties of digesta and fecal microbial composition in growing pigs. Seven castrated Yorkshire pigs with an initial weight of 24.8 kg (SD 3. READ MORE

  5. 19. Correlations between fibre properties and paper properties

    University essay from KTH/Skolan för kemivetenskap (CHE)

    Author : Anna Johansson; [2011]
    Keywords : Fibre properties; Paper properties; Softwood pulp; Crill; Refining; Fiberegenskaper; pappersegenskaper; barrvedsmassa; krill; malning;

    Abstract : The understanding of what properties the fibre should have in order to give the right end-product paper properties, along with the type of processing, is a subject for a lot of research and development. Today the ability to measure fibre properties on-line is widely used for pulps. READ MORE

  6. 20. The effect of charged groups on the beatability of pulp fibres

    University essay from KTH/Skolan för kemivetenskap (CHE)

    Author : Erik Melander; [2011]
    Keywords : Kraft pulp; softwood; carboxymethylation; swelling; PFI beating; refining; beatability; charged groups;

    Abstract : The purpose of this bachelor thesis was to investigate how charged groups within the pulp fibre affect the beatability and the strength of the papers. To obtain different levels of charges on the pulp it was carboxymethylated. The different pulp samples were beaten to different degrees to investigate how charges interact with the beating. READ MORE