Abstract
Thermal treatment of Phyllostachys pubescen bamboo was performed in a dry oven at seven temperature levels (100–220 °C) for four duration times (1–4 h). The results showed that mass loss increased with increasing temperature and duration, and the maximum reduction reached 29.0 %. The color of heat-treated bamboo was darkened and all three color parameters (L*a*b*) were significantly changed. Modulus of elasticity (MOE) was affected slightly when samples were heat-treated below 200 °C, even a slight increase compared with control samples; but it decreased quickly when samples were treated above 200 °C and the maximum reduction was 20.2 %. However, the Modulus of rupture (MOR) and the contents of holocellulose and α-cellulose reduced significantly with increasing temperature and duration when samples were heat-treated above 160 °C, they both strongly correlated with mass loss. It could be confirmed that thermal treatment on bamboo shows an interesting potential to improve bamboo quality.
Zusammenfassung
Phyllostachys pubescen Bambus wurde in einem Trocknungsofen bei sieben Temperaturstufen (100 bis 220 °C) und vier unterschiedlichen Behandlungszeiten (1–4 h) thermisch behandelt. Die Ergebnisse zeigten, dass mit zunehmender Temperatur und Behandlungsdauer der Masseverlust zunahm. Der höchste Masseverlust betrug 29 %. Wärmebehandelter Bambus wurde dunkler und alle drei Farbparameter (L*a*b*) veränderten sich signifikant. Eine Wärmebehandlung unter 200 °C wirkte sich nur gering auf den Elastizitätsmodul aus; er nahm im Vergleich zu den Kontrollproben teilweise sogar leicht zu. Jedoch nahm er bei einer Behandlung über 200 °C schnell bis zu 20, 2 % ab. Bei einer Wärmebehandlung über 160 °C nahmen die Biegefestigkeit (MOR) sowie der Holocellulose- und α-Cellulosegehalt mit steigender Temperatur und Behandlungsdauer signifikant ab. Dies korrelierte stark mit dem Masseverlust. Es konnte bestätigt werden, dass eine Wärmebehandlung von Bambus eine interessante Möglichkeit für die Verbesserung der Bambusqualität bietet.
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Zhang, Y.M., Yu, Y.L. & Yu, W.J. Effect of thermal treatment on the physical and mechanical properties of phyllostachys pubescen bamboo. Eur. J. Wood Prod. 71, 61–67 (2013). https://doi.org/10.1007/s00107-012-0643-6
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DOI: https://doi.org/10.1007/s00107-012-0643-6