DENG Shaoping;WANG Chuncan;LIN Jinguo;RAO Jiuping;College of Material Engineering, Fujian Agriculture and Forestry University;Engineering Research Center of Chinese Fir of State Forestry Administration;

Chinese fir wood;;dye penetration rate;;dye uptake rate;;color difference;;fuzzy comprehensive evaluation;;process optimization

To optimize the dyeing process of Chinese fir wood treated with acid scarlet 3 R, an orthogonal experiment concerning dye mass concentration, dyeing time, dyeing temperature and accelerant dosage were conducted. Dye penetration rate, dye uptake rate and color difference of the products were evaluated by range analysis and variance analysis to evaluate the impacts of dyeing settings on optimal product. Fuzzy comprehensive evaluation was further conducted on product indicators to determine the optimal process parameters. The results showed that dye mass concentration and dyeing temperature had the greatest effects on dye penetration rate and dye uptake rate, but the product parameters varied when the 2 process factors were applied at optimal levels, respectively. Based on fuzzy comprehensive evaluation, the optimal dyeing process was to use dye solution at mass concentration of 2.0%, dye for 4 h at 90 ℃, with the assistant of 3.0% dyeing accelerant. Under the optimal conditions, the dye penetration rate, dye uptake rare and color difference of the dyed wood reached 53.64%, 7.59% and 53.20, respectively, exceeding the maximum testing values when each factor was at the optimal level in the orthogonal experiment, implying the rationality and feasibility of the processing setup.