Effect of Rosin Modification on the Visual Characteristics of Round Bamboo Culm

Abstract

Rosin was used to treat round bamboo culm using the impregnation method. The quantitative color and gloss measurements combined with a qualitative eye tracking experiment were used to evaluate the effect of rosin treatment under different temperatures on the visual characteristics of the bamboo surface. Surface morphology analysis was also used to explore the mechanism of modification. The results showed that proper heating of the modified system was conducive to the formation of a continuous rosin film, which increased the gloss value. The maximum gloss value of 19.6 achieved at 50 °C was 122.7% higher than the gloss value of the control group. Heating decreased the brightness of the bamboo culm and changed the color from the green and yellow tones to red and blue. Additionally, at temperatures higher than 60 °C, the bamboo epidermal layer was damaged or shed, and stripes formed on the culm surface. The density of these stripes increased with an increase in treatment temperature. Eye movement experiment and subjective evaluation showed that high gloss would produce dazzling feeling, such as at 50 °C, while low gloss will appear dim, such as at 80 °C, while the gloss at 40 °C and 60 °C were appropriate. Additionally, the solid color surface below 60 °C had a large audience of about 73%, and the striped surface above 60 °C was preferred by 27% of the subjects.

Using Statistical Methods to Comparatively Analyze the Visual Characteristics of Flattened Bamboo Boards in Different Bamboo Culms

“…According to the black arrow in Figure 3 , the L * values showed an increasing trend from the outside to the inside of the bamboo culm, and the a * and b * values have a rise-fall tendency. The color related chemical components in bamboo mainly arise from lignin and some extracts with unsaturated structures [ 35 , 45 ]. The content of lignin decreased gradually from the outside to the inside of bamboo culms [ 46 ].…”

“…However, the glossiness of the bamboo outer layer was the highest ( G ZL , 5.98%; G ZT , 4.68%), followed by the outer surface ( G ZL , 4.23%; G ZT , 2.92%), and the lowest was the inner surface ( G ZL , 2.76%; G ZT , 2.57%) ( Table 4 ). In reality, the surface glossiness of bamboo is mainly related to its microstructure, thylose, and inclusions [ 22 , 35 ]. The outermost layer of the bamboo wall is the epidermis, which contains embolic and siliceous cells with high silica.…”

“…The color test was performed according to the color space CIE L * a * b * [ 35 , 36 , 37 ]. The color evolution of the 15 groups of samples was monitored using a color meter (X-Rite PANTONE series spectrophotometer, RM200, America) with a D65 standard light source.…”

Antioxidant-Mediated Modification of Citral and Its Control Effect on Mildewy Bamboo

“…As shown in Figure 6 , 2928 cm −1 was mainly produced by the antisymmetric stretching vibration of saturated -CH3, 2844 cm −1 by the symmetric stretching vibration of saturated -CH2, and the absorption enhancement of bamboo chips after treatment was at these two locations [ 36 ]. The absorption enhancement at 1736 cm −1 was mainly produced by the stretching vibration of C=O.…”

Application of rosin resin and zinc oxide nanocomposites to chitosan coatings for extending the shelf life of passion fruits

“…14,15 High melting and hardness result in durable coatings and improve the adhesion between the coating and fruit, the resistance to water permeation and the visual properties due to their good hydrophobicity and brightness. 16,17 To improve coating properties, bioactive compounds with antioxidant and antimicrobial action, avouring compounds and some other additives can be incorporated into lm forming solutions in order to improve the quality, handling and integrity of the coated product. The addition of ZnO nanoparticles has been explored to improve gas barrier properties and provide antimicrobial properties to the coating.…”