Campuran sagu dan iles-iles sebagai ekstender perekat urea formaldehida kayu lapis.
1987
Sumadiwangsa S. | Hadi Y.S. | Simanjuntak J.N. | Kliwon S.
In 1984 Indonesia required more than 64,000 tons of wheat flour for extenders of urea formaldehyde (UF) adhesive in plywood industry. It is considered more economical when the wheat flour can be substituted by locally available carbohydrate such as sago (Metroxylon sp.). However, sago alone gives poor quality as an extender of UF adhesive. Iles-iles (Amorphophallus oncophyllus) is another potential source of carbohydrate. This contains more protein and mannan than that of wheat flour. Therefore, it seemed necessary to explore the possibility of mixing sago and iles-iles as a combined substitute for wheat flour as extender of UF adhesive. This work is intended to obtain optimal ratio of sago and iles-iles formulation, and then to compare its performance with that of wheat flour extender. This study comprise 5 levels of sago and iles-iles mixed and 3 levels of flour extender, each having 5 replicates applied for plywood adhesion. The 7/3 ratio of sago and iles-iles is the same as, if not better than, wheat flour extender. The extender content (X) and plywood bonding strength (Y) for each of the extender was linearly correlated. It is interesting to note that the 6/4 ratio gives very small slope (B) in its linear regression, in contrast to the others. Although the price of iles-iles was comparable to the wheat flour's, iles-iles gives higher bonding strength at lower proportion compared with that of the wheat flour extender.
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