木材・プラスチック複合材の環境影響評価

摘要

WPC is not only able to make from construction debris and waste plastic, but it is recyclable. Therefore it is expected to be a eco-friendly material. As the result of the environmental impact of WPC by life cycle impact assessment using LIME2, the external cost of the WPC was 14.5 yen/kg, and the process of waste treatment has the most profound effect which is accounted for 57% of the external cost. The external costs were calculated for the scenarios of simple incineration, thermal recycling (TR), 50% material recycling and 50% thermal recycling (50%MR-50%TR). The lowest external costs were 50%MR-50%TR followed by TR and simple incineration. Therefore recycling should be achieved to reduce an environmental load of WPC effectively.%木粉とポリプロピレン（PP）やポリエチレン（PE）等の熱可塑性樹脂を混錬し，押出または射出により成型した材料を木材・プラスチック複合材（Wood Plastic Composites：WPC）という。その特徴は，木材と熱可塑性樹脂の性質を併せ持つことで，見た目は木材の風合いを持ち，熱可塑性樹脂に比べ強度が高く，木材に比べ高い熱可塑性，耐水性，生物劣化抵抗性を有することである。