Drying of foam-formed mats from virgin pine fibers

Oleg N. Timofeev (Corresponding Author), Petri Jetsu, Harri T. Kiiskinen, Janne T. Keränen

    Research output: Contribution to journalArticleScientificpeer-review

    21 Citations (Scopus)


    The purpose of this work was to select an efficient drying technique for drying of highly porous thick fiber foam mats with minimum impact on their structure after forming and drainage. Thick fiber mats were produced from wood fibers using foam-forming technology and dried using several different drying methods. The mixture of pine fibers and surfactant (foaming agent) in water was blended using a high-speed blender. After fiber foam generation, a sample mold was filled with wet fiber foam, and after drainage, drying experiments were performed. For comparison, experiments were carried out in an oven, an impingement dryer assisted with a vacuum, and a combined impingement-infrared dryer. At low moisture contents, through-air drying experiments were also carried out. Drying curves, temperature profiles, and shrinkage were measured from the produced mat structures. The most promising drying technique in this study was the combined impingement-infrared drying, used until the fiber mat became permeable, followed by through-air drying until the desired final moisture content was achieved.
    Original languageEnglish
    Pages (from-to)1210-1218
    JournalDrying Technology
    Issue number10
    Publication statusPublished - 2016
    MoE publication typeA1 Journal article-refereed


    • drying kinetics
    • drying methods
    • drying rate
    • foam-formed mat
    • shrinkage


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