CO_(2)激光辐照处理的竹黄色差建模与预测

Modeling and Prediction of Color Change of Bamboo Inner Layer During CO_(2) Laser Modification

激光作为一种先进加工方法,广泛用于木质材料切割、改性等领域,能够显著提高加工效率及产品性能。采用CO2激光辐照竹黄表面,选择激光功率、移动速度以及移动路径距离为输入变量,探究激光处理参数对竹黄表面颜色变化的影响规律,并建立了二次预测数学模型定量描述竹黄色差与激光处理参数的相关性。研究结果表明:竹黄表面的总色差随激光功率的增强而变大,但随移动速度和移动路径距离的增大而下降。处理后,竹黄表面颜色变暗,其明度变化值的绝对值亦随激光功率的增强而变大,随移动速度和移动路径距离的增大而下降。竹黄总色差最大为19.9,明度最大下降了16.2,呈现明显黄褐色。总色差与明度变化值二次预测模型的相关性系数(R2)分别为0.981 1和0.984 3,预测性良好。激光处理可使竹黄呈现深黄、黄褐色等颜色,丰富了竹黄外观视觉效果。

As an advanced processing method, laser is widely used in cutting and modifying of wood materials, which could significantly improve the processing efficiency and product performance. In this study, the bamboo inner layer was irradiated by CO2 laser, and the laser power, moving speed and moving path distance were selected as input variables to explore the effects of laser modification parameters on the color changes and created the prediction models for color difference. The results showed that the total color difference of bamboo inner layer increased with the increased of laser power, but decreased with the increased of moving speed and moving path distance. The brightness values showed a downward trend, and the surface color of bamboo inner layer became darker after laser treatment, the absolute value of brightness difference also increased with the enhancement of laser power, and decreased with the increased of moving speed and moving path distance. After laser treatment, the maximum value of total color difference was 19.9, and the value of brightness decreased 16.2. The values of R2 of quadratic prediction models for total color difference and brightness were 0.981 1 and 0.984 3, respectively. It meant these two models had good prediction. After laser treatment, bamboo inner layer can present different color such as light yellow and yellowish brown, which enriches the visual effect of the bamboo materials.