CD profile measurements and paper runnability

Timo Kaljunen, Markku Parola, Hannu Linna

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

    Abstract

    The web tension profile of the paper across the web with its variation during the run has been found to be a good indicator to estimate runnability. A long-term study has been carried out on a rotogravure press where the web tension profiles of over 5,500 reels were measured automatically at the reel stand. The measurements showed the importance of an even web tension profile to runnability. Methods for adjusting the web tension are outlined. Some web tension measuring equipment tested on a production scale are discussed here. The shape of the web tension profile of the reels originates in the paper mill. The strongest variations in the tension were found in the surface layers of the reel. The principal problems with runnability problems were web breaks and register errors which increased paper waste and decreased production efficiency. Most of the web breaks occurred after the printing units when the web was cut into narrow strips. The critical features of web tension were calculated and used to compare different paper grades. The results indicated that most web breaks occurred and more paper waste was produced when the tension was extremely low or high in some areas, or if the tension varied across the web.
    Original languageEnglish
    Title of host publicationNew measurements, challenges and visions
    Subtitle of host publicationCross directional web measurements, controls and actuator systems in paper machines
    EditorsJouko Halttunen, Timo R. Nyberg, R.K. Ritala
    Place of PublicationHelsinki
    PublisherFinnish Society of Automation
    Pages8-13
    Volume10B
    ISBN (Print)978-952-5183-05-4
    Publication statusPublished - 1997
    MoE publication typeA4 Article in a conference publication
    EventXIV IMEKO World Congress: New Measurements - Challenges and Visions - Tampere, Finland
    Duration: 1 Jun 19976 Jun 1997

    Publication series

    SeriesActa IMEKO
    Volume14
    ISSN0237-028X

    Conference

    ConferenceXIV IMEKO World Congress
    CountryFinland
    CityTampere
    Period1/06/976/06/97

    Keywords

    • web tension profile
    • paper
    • runnability

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  • Cite this

    Kaljunen, T., Parola, M., & Linna, H. (1997). CD profile measurements and paper runnability. In J. Halttunen, T. R. Nyberg, & R. K. Ritala (Eds.), New measurements, challenges and visions: Cross directional web measurements, controls and actuator systems in paper machines (Vol. 10B, pp. 8-13). Finnish Society of Automation. Acta IMEKO, Vol.. 14