Korean filler raw materials for plywood adhesives

Korean-source residues from walnut, pinenut, and ginkgonut shells were evaluated as fillers in adhesives for bonding plywood made from New Zealand radiata pine veneer. The nutshell residues were prepared by drying to a 6 to 8 percent moisture content am by grinding the dry material in a laboratory Wiley mill to a 75-micrometers (200-mesh) screen size. The nutshell residue fillers were compared to a furfural-process residue filler (control) commonly used in adhesives of the United States for bonding structural plywood and laminated veneer lumber. Plywoods were uniformly assembled (around 30 min. assembly time) and cured at two hot press times (4 and 5 min.) for each filler type and tested for physical properties per the U.S. Product Standard PS 1-95. All plywood made with the adhesives containing the Korean nutshell residue fillers were comparable in shear strength and wood failure quality to the control-bonded plywood The results indicated that the Korean nutshell residues would be suitable as fillers for structural plywood adhesives.

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