Effect of blanket properties on web tension in offset printing

Merja Kariniemi, Markku Parola, Artem Kulachenko, Joonas Sorvari, Leo von Hertzen

    Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review


    VTT and KCL together with several companies in the printing value chain have studied how to control web tension in different parts of a printing press. Extensive trials on printing presses, at pilot scale and at laboratory scale have yielded data for modeling work. Modeling was carried out with statistical methods and by finite element method (FEM). Results show the extent to which paper and printing blankets affect tension formation in a printing press. The main emphasis of this paper is on the effect different printing blanket types have on web tension. It was found that printing blankets have a clear effect on web tension. The degree of tension change is affected by the type of blanket, nip pressure, distances between the blankets, moisture, paper properties and the combination of blanket types in different printing units. Depending on their feeding properties and their effect on web tension, in general, the blankets can be distinguished as negative, neutral and positive. Also the blanket's effect on web tension is influenced strongly by the type of adjacent blankets. The interactions of fountain solution, ink, nip, blanket and paper had also an effect on the tension formation. The paper experiences a very high rate of strain inside the printing nips, which can affect the paper's response and therefore tension after the nips. Results suggest that tension cannot be solely predicted with the elastic paper properties measured by conventional methods.
    Original languageEnglish
    Title of host publicationAdvances in Printing and Media Technology. Vol. XXXVII
    Subtitle of host publicationProceedings of the 37th International Research Conference of iarigai
    PublisherIARIGAI - International Association of Research Organizations for the Printing, Information and Communication Industries
    ISBN (Electronic)978-3-9870704-5-7
    ISBN (Print)978-3-9812704-2-6
    Publication statusPublished - 2010
    MoE publication typeA4 Article in a conference publication
    Event37th International Research Conference of iarigai - Montreal, Canada
    Duration: 12 Sept 201015 Sept 2010


    Conference37th International Research Conference of iarigai


    • offset printing
    • web tension
    • runnability
    • printing blanket
    • paper


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