Open AccessFINAL TECHNICAL REPORT
Author(s) -
Charles E. Frazier
Publication year - 2008
Language(s) - English
Resource type - Reports
DOI - 10.2172/1000513
Subject(s) - veneer , adhesive , isocyanate , laminated veneer lumber , moisture , materials science , pulp and paper industry , formaldehyde , composite material , environmental science , polyurethane , chemistry , engineering , layer (electronics) , organic chemistry
This research effort was directed towards the development of a novel cold-setting adhesive for the manufacture of laminated veneer lumber, LVL. The adhesives studied were isocyanate-reactive polyurethanes that cure at room temperature and bond to high moisture content veneer (12%). The elimination of hot-pressing and the reduction in veneer drying is expected to provide substantial energy savings and decreases in VOC emissions. Furthermore, the use of higher moisture content veneer was expected to reduce or eliminate the tendency for veneer over drying, and the related reduction in wood surface energy. The effort produced a novel emulsion polymer isocyanate (EPI) adhesive that performed better than the standard phenol-formaldehyde adhesive. This performance comparison/evaluation suggested that the new adhesive could perhaps meet the original project goals, stated above. However, this effort was not translated into technological practice, nor evaluated on a larger pilot scale, because the participating companies experienced personnel changes that altered outlook for this technology