Eastern Spruce Flakeboard Resin Distribution and Decorative Panel Evaluation
Life Sciences and Agriculture Experiment Station, University of Maine at Orono, 1975 - Gums and resins - 15 pages
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 area coverage, over the entire wood furnish, was 8.05 percent. 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.
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A—front adhesive and wood Aniline blue average resin area average resin droplet B—back bond strength coarse resin spray color composed of ﬂakes continuous ﬁlm continuous glue lines coriphosphine crystal violet dark ﬁeld ﬂuorescence Decorative panel composed Decorative Panel Evaluation decorative wallboard panel differentiating between adhesive droplet or continuous dyed with rhodamine eastern spruce ﬂakeboard fabricated Figure Film 94 ﬁne resin spray ﬁnished panel ﬁve randomly ﬂake showing small ﬂake surfaces ﬂakeboard panels ﬂakes dyed ﬂow ﬂuores ﬂuorescence study involving ﬂuorescent dye ﬂuoro histological stains incident and trans Incident bright ﬁeld incident ﬂuorescence large resin droplets Longitudinal edge view lution was obtained Magniﬁcation methyl orange microns microtome Number Orono paraffin paraﬂin percent resin area Percent Resin Coverage reﬂected resin application system resin area coverage resin distribution resin droplet diameter small and large spot-welds strong glue lines study involving incident Surface Viewed thin sections tion urea-formaldehyde various histological viscosity wood stains wood substrate