In collaboration with its partners, VTT developedtannin extraction from softwood barkas part of an ERA-NET project. At least 130 kg of crude tannin powder can be produced from one ton of dry wood bark, still leaving 87% of the original bark mass available for incineration. In Finland, tannin could replace, in particular, fossil-based phenols in adhesives used in the wood products industry.
Hundreds of tons of tannin is produced from wood materials and wood bark for the needs of leather, beverage and animal feed industry in South America and South Africa in particular. However, the supply of the main sources of tannin, acacia and quebracho trees, is not sufficient to satisfy the increasing industrial demand for tannin.
In industrial use, tannin could be used to replacefossil chemicals in adhesivesand insulating foams. In Finland, softwood bark tannins would be well suited foradhesive production for the manufacturing of wood productsat sawmills. It could also enhance the fire resistance of insulating foams.
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