Eigenschaften von mitteldichten Faserplatten (MDF), hergestellt mit natürlichen Polyphenolen (Tannine, technische Lignine) als Bindemittel

Tanninformaldehyde resins from tannin of Quebracho wood in combination with extract of spruce bark were used as a binder for MDF. The results show that the commercial tannin of Quebracho wood can be partially substituted by bark extract (water extraction) of indigenous spruce up to 60 per cent without any deterioration of the bending strength and internal bond strength according to EN 319 of the MDF. The internal bond strength according to EN 321 (test V313) was decreased by spruce tannin. However, the MDF fullfil the requirements of type MDF.H.