Abstract
This study was conducted to evaluate the performance of soybean meal as a protein extender in plywood adhesive intended for sprayline coaters. Ground soybean meal, with 52.8% (dry basis, db) crude protein and 0.9% (db) residual oil, replaced the current industry extender, wheat flour, in the standard glue mix. Substitution was done on the protein content basis. Mixing and adhesion properties of the glue containing soybean meal were compared with those of the industry-standard glue. The soybean meal-based glue showed excellent mixing characteristics and its viscosity (1,275 cp) met the recommended value for this type of adhesive. Its wet tensile strength, however, was less than that of the standard glue and below the threshold value of 200 psi considered as an indicator of strong bonding. The soybean meal glue formulation was then modified further by increasing the amount of meal such that the amount of protein present was double that contributed by wheat flour in the original mix. This adjustment resulted in higher wet tensile strength (209 psi), which not only met the threshold value for strong glue bonds, but also equaled that of the standard glue. These results demonstrated that soybean meal is a viable extender in plywood glue for sprayline coaters.
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Acknowledgments
I am grateful to Debra Stamm of NCAUR for her assistance in the preparation and analyses of the samples, plywood processing, and bond strength testing of the wood specimens. I also thank Jon Maas and Tom Conroy of Aventine REI and Bobby Williamson of Georgia-Pacific Chemicals for providing the materials to make the glues and plywood.
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The mention of trade names or commercial products in this paper is solely for the purpose of providing specific information and does not imply endorsement by the US Department of Agriculture.
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Hojilla-Evangelista, M.P. Adhesion Properties of Plywood Glue Containing Soybean Meal as an Extender. J Am Oil Chem Soc 87, 1047–1052 (2010). https://doi.org/10.1007/s11746-010-1586-x
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DOI: https://doi.org/10.1007/s11746-010-1586-x