Influence of gravure process on ink lifting efficiency

Soile Passoja, Asko Sneck, Yingfeng Shen, Jorma Koskinen, Robert Roozeman

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

    Abstract

    Electrostatic assistance (ESA) lifts gravure ink from the engraved cells before actual nip contact. This improves ink transfer. In this work the influence of ESA on ink lifting speed and height was examined with both electromechanically engraved and laser etched cells using numerical simulation and experimental studies. Ink lifting occurs quite similarly from both cell types: without ESA ink stays in the cells until the physical ink-substrate contact in the nip is formed. With ESA ring shaped ink lifting near the cell edges is noted before the nip contact. This leads to a doughnut shape contact area in the nip. Higher ESA levels lead to faster ink lifting and stronger ring shaped ink lifting in the cells. Ink lifting occurs faster from U cells than from V cells when the cells are having the same diameter and depth. This however means different ink volume in the cells. The cell geometry affects the shape of the printed dots: even and round dots are printed with cells having flat bottom. This nearly constant depth of the cell provides equally distributed ink in the cell offering also more even ink transfer.
    Original languageEnglish
    Title of host publicationAdvances in Printing and Media Technology
    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
    Pages283-290
    VolumeXXXVII
    ISBN (Electronic)978-3-9870704-5-7
    ISBN (Print)978-3-9812705-2-6
    Publication statusPublished - 2010
    MoE publication typeA4 Article in a conference publication
    Event37th International Research Conference of iarigai - Montreal, Canada
    Duration: 12 Sep 201015 Sep 2010

    Conference

    Conference37th International Research Conference of iarigai
    Country/TerritoryCanada
    CityMontreal
    Period12/09/1015/09/10

    Keywords

    • gravure printing
    • electrostatic assistance
    • cell geometry
    • ink lifting

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