Analysis of the chain-flail debarking using a high speed motion analysis system

Timo Lappalainen, Veli-Juhani Aho, Juha Kärkkäinen

    Research output: Contribution to journalArticleScientificpeer-review

    1 Citation (Scopus)


    Chain-flail delimbing-debarking technology is suitable for multi-tree processing of small-diameter trees. In the chain-flail debarking process, the rotation speed of the chain drum ranges 300-500 rpm. Therefore, a high-speed motion analysis is the only method to show what really happens in the debarking process. In this study, it was noticed that debarking occurs in a very short time (about 0.5 ms) when the chain hits the timber. If the chain hits the side of the tree, the chain just slides on the surface of the tree and is not able to debark the tree efficiently. In the determination of the impact force there is a clear correlation between the results obtained by a load cell mounted at the hitting point of the chain and those calculated using the impact time determined with a high-speed motion analysis system. This information makes it possible to determine the maximum impact force of the chain without measuring it.
    Original languageEnglish
    Pages (from-to)195-200
    Number of pages6
    JournalHolz als Roh- und Werkstoff
    Issue number3
    Publication statusPublished - 2001
    MoE publication typeA1 Journal article-refereed


    • trees
    • delimbing
    • debarking
    • analysis
    • image analysis
    • image processing
    • chains
    • hitting force
    • impact force


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