Verbessertes Entwässerungsverhalten von elektronenbestrahlten Holzstoffen am Beispiel von Wasserrückhaltevermögen und spezifischer Oberfläche

Sabine Heinemann, Toni Handke, Sari Liukkonen, Jari Leino, Saskia Runte, Harald Grossmann

    Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientific

    Abstract

    Pre-treatment of wood chips and wood log discs with electron irradiation results in significant changes of the mechanical pulp properties. Interesting conclusions for the application of such mechanical pulps can be drawn not only from the energy savings during refining (TMP) and grinding (SGW), but also from the resulting pulp properties such as fibre morphology and drainability. The suitability for a partial application in newsprint has already been shown in mill-scale1, and now, the property changes are focused more in detail. The varied morphology of mechanical pulps after raw material irradiation appears i.a. in shorter and more straight fibres with reduced cross-sectional dimensions and thus, with a lower coarseness. In the light microscope, smoother and more closed fibre surfaces could be observed. The swelling ability and the ability to bond water onto the fibre surface, respectively, that can be removed mechanically, decreased. Subsequently, a better drainability for these pulps was measured by water retention value and hydrodynamic specific surface area. The development of strength properties for handsheets was discussed based on the results from fiber morphology and drainability leading to the conclusion that mechanical pulps after electron irradiation can be produced more energy-efficient with good drainability but some strength decay.
    Original languageEnglish
    Title of host publicationProceedings
    Subtitle of host publicationDie österreichische Papierfachtagung, Graz, 23.-24.05.2012
    Place of PublicationGraz, Austria
    PublisherAPV Graz - Akademischer Papieringenieurs Verein
    Publication statusPublished - 2012
    MoE publication typeNot Eligible
    EventInternational Austrian Paper Conference - Österreichische Papierfachtagung 2012 - Graz, Austria
    Duration: 23 May 201224 May 2012

    Conference

    ConferenceInternational Austrian Paper Conference - Österreichische Papierfachtagung 2012
    CountryAustria
    CityGraz
    Period23/05/1224/05/12

    Keywords

    • Mechanical pulping
    • TMP
    • irradiation
    • dewatering
    • water retention value
    • specific surface area
    • fibre properties

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