Kohta Miyamoto

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Hinoki (Japanese cypress) strand with 0.6mm thickness was hammer-milled to prepare three types of particles that had the same thickness but different lengths and widths. Screen analysis and image analysis were conducted to evaluate the shape and distribution of the particle dimensions. Laboratory-scale particleboards were fabricated at three density levels(More)
Particleboards were fabricated in the laboratory with different board densities and resin contents to evaluate linear expansion when exposed to both vapor and liquid water. Density profiles were measured to determine the relation to the elastic constants and to the dimensional properties of the boards. It was found that density profiles were affected by the(More)
Mat consolidation behavior was investigated at various press closing times (PCTs) using hinoki (Japanese cypress) particle mats. The temperature in the core layer of the mat, press pressure, and platen distance were measured. At the plateau stage during hot pressing, the core temperature decreased with increasing PCT. The core temperature did not increase(More)
Volatile organic compounds (VOCs) from wood-based materials have been a topic of great concern as one of the causes of sick building syndromes for decades. According to an investigation of indoor air quality of new residences by the Japanese Ministry of Land, Infrastructure and Transport, about 9% of all residences exceeded the guideline value of 48mg/m(More)
A mechanism of acetaldehyde emission from wood induced by the addition of ethanol was proposed. It is known that acetaldehyde generation is due to the oxidation of ethanol via a metabolic process involving alcohol dehydrogenase (ADH) in living bodies. However, it remains unclear whether the enzymatic alcohol oxidation is applicable to wood. We investigated(More)
Acetaldehyde emissions from particleboard, fiberboard, and plywood were studied using the small chamber method and high-performance liquid chromatography analysis. The chamber tests were conducted for 1 month to examine the time dependence of acetaldehyde emission. Effects of temperature and relative humidity were also examined. Acetaldehyde emissions from(More)
In ISO/TC89, the measuring method of formaldehyde emitted from wood-based materials was discussed, and the ISO standard of the desiccator method was enacted in 2008. There are some differences between the desiccator methods according to JIS and ISO standard and therefore, the experimental equivalence is not evident. In this study, equivalence of the cooling(More)
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