Sökning: "paper strength"

Visar resultat 16 - 20 av 564 avhandlingar innehållade orden paper strength.

  1. 16. On the Adhesion Between Substrates Covered with Polyelectrolyte Multilayers

    Författare :Rikard Lingström; Lars Wågberg; Lennart Piculell; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; fibre; polyelectorlyte; multilayer; wettability; contact angle; paper strength; atomic force microscopy; surface force apparatus; Cellulose and paper engineering; Cellulosa- och pappersteknik;

    Sammanfattning : This thesis examines the formation of Polyelectrolyte Multilayers (PEM) on cellulose fibres as a new way of influencing the fibre surface and the adhesion between wood fibres. The aim of the study was to enhance the fundamental understanding of the adsorption mechanisms behind the formation of Polyelectrolyte Multilayers on cellulose fibres; to study how the properties of the layers can be influenced and to show how the properties of the layers influence the adhesion between the fibres and the strength of paper sheets made from the PEM treated fibres. LÄS MER

  3. 17. Xylan Reactions in Kraft Cooking : Process and Product Considerations

    Författare :Sverker Danielsson; Mikael Lindström; Richard Gustafson; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Xylan; Kraft cooking; Paper strength; Sheet density; Methylglucuronic acid; Hexenuronic acid; Cellulose and paper engineering; Cellulosa- och pappersteknik;

    Sammanfattning : Xylan is the main hemicellulose in birch, eucalyptus, and most other hardwood species. During kraft pulping a series of chemical reactions and physical processes involving xylan takes place. LÄS MER

  4. 18. Radiation crosslinking of cellulose fibers to obtain rigid lightweight paperboard

    Författare :Mikaela Börjesson; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; Paper; Modification; Ester; Crosslinking; Cellulose; UV radiation; Acrylates; Packaging;

    Sammanfattning : Cellulosic materials are used in a wide range of areas of application, and one of these is paperboard for packaging solutions. Paper or paperboard as a packaging material has benefits like low density, low costs, high stiffness, good printability, and paper is environmentally friendly. LÄS MER

  5. 19. Modelling Damage Evolution and Fracture of Paper Materials

    Författare :Rickard Hägglund; Hållfasthetslära; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Paper material; Fracture mechanics; Tensile strength; Fibre network; Continuum damage mechanics; Non-local theory;

    Sammanfattning : This thesis contains six papers dealing with different aspects of damage and fracture in paper. The work addresses the problem of material length scales in the context of deformation and fracture of paper materials. LÄS MER

  7. 20. Beam-to-Beam Contact and Its Application to Micromechanical Simulation of Fiber Networks

    Författare :Hamid Reza Motamedian; Artem Kulachenko; Umberto Perego; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; fiber network; beam-to-beam contact; rotational contact; non-consistent; simulation; finite element; multiscale; microscale; micromechanics; paper; refining; beating; fine; hygroexpansion; shrinkage; drying; Hållfasthetslära; Solid Mechanics;

    Sammanfattning : This doctoral thesis covers the topic of modeling the three-dimensional fiber net- works with the finite element method. It contains the part addressing the numerical aspects of the modeling, namely, the contact formulation and application of the developed methods to the fundamental questions such as the effect of randomness in fiber properties and effect of fines and hygroexpansion. LÄS MER