弾力性を有する木片炭化マットの製造と断熱材への適用に関する基礎的研究（第1報）―製造条件と熱伝導率の関係―

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タイトル別名
  • ダンリョクセイ オ ユウスル モクヘン タンカ マット ノ セイゾウ ト ダンネツザイ エ ノ テキヨウ ニ カンスル キソテキ ケンキュウ ダイ1ポウ セイゾウ ジョウケン ト ネツ デンドウリツ ノ カンケイ
  • Carbonizing binder-less wood shaving insulation panels for better insulation capacity and durability (part 1) －Relationships between manufacturing condition and thermal conductivity－

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説明

The insulation panels developed in our previous study are composed of wood shavings cold-pressed into a mat with a density of around 100 kg/m3 without any binder. This elastic mat is lapped with plastic film that works as a damp proof course and is installed between studs or joists of timber frame houses. In the fireproof test of this insulation panel, it was observed that our insulation panels remained unbroken between studs after they burned, which suggests that a wood shaving elastic mat can hardly shrink in its compressive direction. This led to the present research work, carbonizing our insulation panels for better insulation capacity and durability since changes of macro and micro-pores caused by carbonization may provide our panels with better insulation capacity and carbonization itself can remove a risk of decay. In this paper, thermal conductivities of the panels are discussed in relation to their manufacturing factors such as initial panel density and carbonizing temperature. Panels with an initial density of 150, 200, 250 and 300kg/m^3 and with a size of 200 by 200 by 50 mm were manufactured and then, they were carbonized at five different temperatures of 300, 400, 500, 600 and 700℃. A good panel formability was obtained at a combination of 200-300kg/m^3 and 400-500℃. The smallest thermal conductivity was 0.044W/mK and it was obtained at a combination of 250 kg/m^3 and 400℃ that satisfied above mentioned manufacturing conditions with good panel formability. This thermal conductivity was 20 % less than that of our previous woods having panels. Macro-pore distributions of the panel sections were obtained by micrograph and image analysis. The results revealed that carbonizing at 400℃ provides the panels with less macro-pore of 3 mm^2 and over which may cause air convection resulting in a higher thermal conductivity. Furthermore, water adsorption isotherm at 20℃ was determined, and it was found that the hygroscopicity was lower than before carbonizing and was different between 400℃　and 700℃. One reason for better insulation capacity of carbonized panels is thought to be less hygroscopic and much micro porous inside wood shavings than our previous panels.

収録刊行物

  • 岩手大学農学部演習林報告

    岩手大学農学部演習林報告 (41), 1-15, 2010-06-01

    岩手大学農学部附属寒冷フィールドサイエンス教育研究センター

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