Fillers for plywood adhesives made from acid hydrolysis residues of municipal newsprint wastes

Solid residues from the Tennessee Valley Authority’s acid hydrolysis process of municipal newsprint waste were used as adhesive fillers for bonding southern pine plywood. The residues were prepared as unextracted and methanol-extracted fillers and compared to a commercial filler commonly used in adhesives for structural plywood and laminated veneer lumber. Plywood (12.7 mm thick) was made at two press times (4 and 5 min.) and three assembly times (20, 40, and 60 min.). All plywood made with the two residue fillers was comparable to the control-bonded plywood with one exception: the short assembly time for unextracted fillers. This exception can be corrected by spread or adhesive adjustments. These results indicate that residues from the acid hydrolysis process of newsprint waste streams would be suitable as fillers for plywood adhesives. The usage of these residues will enhance the economics of the acid hydrolysis processing of newsprint and wood from municipal solid wastes.

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