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Title: Effect of Thermal Treatment of Veneer on Formaldehyde Emission of Poplar Plywood
Authors: Murata, Koji  kyouindb  KAKEN_id
Watanabe, Yashuhiro
Nakano, Takato
Author's alias: 村田, 功二
Keywords: formaldehyde emission
poplar plywood
thermal treatment
Langmuir’s theory
Hailwood-Horrobin theory
Issue Date: Feb-2013
Publisher: MDPI
Journal title: Materials
Volume: 6
Issue: 2
Start page: 410
End page: 420
Abstract: A large amount of poplar plywood is now being imported into Japan from China, and as a result, formaldehyde emitted from this plywood represents an undesirable chemical that must be controlled using a chemical catching agent. The aim of this study is to find an approach to reduce the formaldehyde emission of poplar plywood using thermal treatment without employing any chemicals. The experimental results obtained show that heating veneer sheets in the temperature range of 150 °C to 170 °C effectively reduced the formaldehyde emission of plywood, without diminishing the mechanical properties of the veneer. By applying Langmuir’s theory and Hailwood-Horrobin theory to the adsorption isotherm obtained in this study, the relationship between the formaldehyde emission of plywood and the adsorption properties of veneer as a material is discussed. When veneer sheets were heated in the temperature range of 150 °C to 170 °C, the amount of hydrated water (monomolecular layer) decreased slightly and that of dissolved water (polymolecular layer) did not change. It is hypothesized that the formaldehyde emission of plywood is related to the condition of the adsorption site of the wood.
Rights: © 2013 by the authors; licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (
DOI(Published Version): 10.3390/ma6020410
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