| summary(En) : | As one of the structural studies on the gluing of wood, the application of electron microscopy in an examination of the glue line of plywood has been employed. Plywood from Japanese birch (Betula Maximowicziana) was glued with urea- and phenol resin, and urea resin extended with wheat flour. Ultrathin sections of plywood incorporating a glue line were taken from a portion of the plywood, and the interrelationship between the glue and the wood substrate were observed with the aid of electron microscopy.
Two types of the interrelationships of veneer and glue line were noted; between excised and unexcised walls. When sections of plywood glued with urea- and phenol resin were examined, it could be seen that the type of surface had no effect on the contact of adhesive, and that within the range of electron microscopic resolution, there was complete contact between the glue and the wood surface. There was a homogeneous appearance to the glue line except when the resin was extended with wheat flour, creating a variegated pattern due to differences in electron density and to the presence of micropores. |
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