Effect of Steam Heating on the Color and Chemical Properties of Neosinocalamus Affinis Bamboo
2013
Zhang, Yamei | Yu, Wenji | Zhang, Yahui
Fibrous veneers in loose structure were made from Neosinocalamus affinis bamboo, and then used as the basic element for bamboo-based fiber composites. Steam treatment of the fibrous veneers was performed inside an autoclave at 0.35 MPa to 0.45 MPa (147°C to 155°C) for 110 min to 170 min. After steam treatment, all three color parameters (L*a*b*) of fibrous veneers were changed significantly. The color change (ΔE*) increased with higher pressure and longer duration. The chemical properties of steam-treated samples were examined using chemical analysis. A decrease in the content of holocellulose and α-cellulose with an elevation in steam treatment was found. The water extractives content and buffering capacity increased, and the effect of pressure and duration on them increased significantly. pH value decreased significantly compared with control samples, but only small variations were found among steam-treated samples. Through correlation analysis, pH value was strongly correlated to hemicelluloses and water extractives.
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