A standard urea-formaldehyde liquid adhesive was used in the manufacture of eastern spruce flakeboard panels. The resin application system, resin viscosity, furnish moisture content, and application period were all conducive to the formation of a fine resin spray. The average resin droplet diameter was approximately 20 microns, while the average resin are a coverage, over the entire wood furnish, was 8.05%. Resin distribution in the microscopically observed panel specimens appeared in the form of “spot-welds” and intermittent glue lines. The use of various histological and commercial stains was effective in producing decorative panels.https://digitalcommons.library.umaine.edu/aes_techbulletin/1125/thumbnail.jp
