Ceriops tannin-based wood adhesives
1989
Villaflor, A.A. | Mahitikul, C. (Philippines Univ., Los Banos, College, Laguna (Philippines). Wood Science and Technology)
Tannin extracts from barks of tangal [Ceriops tagal (Perr.) C.B. Rob.] were obtained by using the six-stage countercurrent process with efficiency of 85.8%. Tannin content was 26.1%; tannin formaldehyde precipitates, 47.2%; tannin to nontannin ratio, 16:1. Tangal tannin formaldehyde (TTF) adhesive developed Type 2 bond (Water Resistant) quality in 3-ply, 7.8 mm x 300 mm x 300 mm white lauan plywood. Fortifying the TTF adhesive with 30... 40 percent phenol formaldehyde improved the glueline quality to Type 1 bond (Waterproof). Tannin analysis properties of tannin formaldehyde adhesives and body quality tests are discussed.
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