Effects of bleaching and heat treatment were investigated for Indosasa angustata bamboo grown in Vietnam. Hydrogen peroxide (H2O2) at a concentration of 30% was used for the bleaching process. For the heat treatment, the bamboo strips were heat-treated at two different temperatures (120 °C and 140 °C) for 3 h. There was a slight increase in the lignin and hemicellulose contents of the samples treated at 100 °C for 1 h when H2O2 was used. The water absorption rate did not change much, and the treated bamboo strips became brighter after undergoing bleaching. For the heat-treated samples, the lignin content slightly increased after the samples were heated at both 120 °C and 140 °C for 3 h. Moreover, the higher heating temperature led to a lower hemicellulose content, a darker colored bamboo sample, and a lower water absorption rate for the treated bamboo strips.

https://ojs.cnr.ncsu.edu/index.php/BioRes/article/download/BioRes_14_3_6608_Nguyen_Bleaching_Heat_Treatments_Indosasa/6987

Effects of Bleaching and Heat Treatments on Indosasa angustata Bamboo in Vietnam

Bleaching is an effective way to remove the color difference of wood after its hydrothermal treatment.Different bleach formulas were investigated on their effectiveness of minimizing the color variation of commonly-used maple and rubber lumbers. The results showed that rubber wood was easier to bleach than maple wood. The optimum bleaching conditions were found to depend on the hydrothermal treatment conditions.

Wang Rui-juan

Papers

Bleaching Technology of Wood after Hydrothermal Treatment