Improvement of dimensional stability and weatherability of composite board made from water-vapor-exploded wood elements by liquefied wood resin impregnation |
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Authors: | Hiroshi Saotome Masaharu Ohmi Hiroshi Tominaga Kiyoharu Fukuda Yutaka Kataoka Makoto Kiguchi Yasushi Hiramatsu Atsushi Miyatake |
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Institution: | (1) Faculty of agriculture, Tokyo University of Agriculture and Technology, Fuchu, Tokyo 183-8509, Japan;(2) Forestry and Forest Products Research Institute, Tsukuba 305-8687, Japan |
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Abstract: | High-density and high-resin-content boards were produced by phenolic resin impregnation into board materials prepared by the
water-vapor-explosion process (WVE) to develop high-durability wood composite boards for exterior use. Wet-dry cyclic tests
and accelerated weathering tests were conducted, and the fundamental properties were determined to examine the effect of resin
impregnation on board qualities. Bending and internal bond strength of resin-impregnated boards (I-board) satisfied the criterion
for 18-type particleboard described in JIS A 5908. Thickness swelling (TS) after 24-h water immersion was approximately 2%.
Resin impregnation improved the dimensional stability of the boards. In wet—dry cyclic testing, TS of I-board was the same
as that of plywood. The retention ratio of modulus of rupture of I-board was large; thus, I-board had high bond durability.
Color change of I-board was less than that of ordinary particleboard after a 500-h accelerated weathering test. I-Board had
lower surface roughness than boards produced by a spray application method (S-board) and higher water repellency, although
the difference in resin contents of the face layer was small. Thus, it is suggested that the surface properties and weatherability
of I-board were improved by impregnation of phenolic resin. High-density and resin-impregnated boards made from the WVE elements
are expected to withstand actual exterior use.
Part of this report was presented at the 54th Annual Meeting of the Japan Wood Research Society, Sapporo, August 2004 |
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Keywords: | Exterior board Water-vapor-explosion process Liquefied wood resin impregnation Wet-dry cyclic test Accelerated weathering test |
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