X.X-post-print laser marking: A solution to the challenge of 100% calcium carbonate coating when using CO2 lasers

Roger Bollström, Patrick Gane

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


    Laser marking is a widely used technique to form individualised identification, such as product numbering or 2D coding. The technique is based on ink removal via laser ablation, which requires local heating with a laser beam, i.e. the coating layer must absorb at the particular wavelength of the laser to provide the heat to vaporise the ink layer. Calcium carbonate shows a very low absorption at the wavelength peaks of the typical CO2 lasers used, which has led to the need to incorporate a threshold amount of other minerals, however generally at the cost of losing natural brightness. Post application of an ultrathin nanoclay or nanosilica layer onto a high brightness calcium carbonate coating is shown to support laser ablation of offset ink with all the standard laser wavelengths, without compromising the optical appearance.

    Original languageEnglish
    Title of host publicationProceedings of the Paper Conference and Trade Show, PaperCon 2016
    PublisherTAPPI Press
    Number of pages8
    ISBN (Electronic)9781510831193
    Publication statusPublished - 2016
    MoE publication typeA4 Article in a conference publication
    EventTAPPI Paper Conference and Trade Show - Cincinnati, United States
    Duration: 15 May 201618 May 2016


    ConferenceTAPPI Paper Conference and Trade Show
    Abbreviated titlePaperCon
    CountryUnited States


    • Digital printing
    • Ink ablation
    • Irradiation of coatings
    • Laser marking
    • Light absorption


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