The quantity of bark is the primary factor that defines the quality of debarking. In addition, every measure is taken to prevent wood loss caused by debarking so as to minimise unnecessary costs. Both factors must be taken into account to achieve the best possible economic result.
At sawmills, economic considerations relating to debarking are significant since the amount of bark is one of the ways payment is assessed with regard to woodchips used for pulp production. In the Nordic Countries, for example, a bark concentration of 1% reduces the price paid for woodchips, and many factories pay extra if the bark content is less than 0.5%.
The purpose of debarking is to break down the cambium between the bark and the wood and separate the two components. This is done by subjecting the cambium to force that is sufficient to break the bark and the bond between the layers.
Debarking characteristics depend on the binding strength between the bark and the wood, the structure of the bark, the shape and quality of the timber and the debarking conditions. The properties of different wood species vary; there can even be significant variation within a species due to environmental conditions. Regardless of the wood species, debarking frozen and dried timber is always more difficult as the bond between the bark and the wood will be stronger.
During its 60-year history, VK has amassed a wealth of knowledge about debarking from all over the world. VK has experience debarking all wood species used in industry, and we have excellent solutions for all requirements, whatever the wood species and conditions. Thanks to our extensive experience, we can always guide our customers to the optimal debarking solution.