Effects of feed speed ratio and laser power on engraved depth and color difference of Moso bamboo lamina

In this study, Moso bamboo (Phyllosachys edulis) lamina was engraved using various laser output power levels in conjunction with various feed speed ratios in order to understand the effects of feed speed ratio and laser output power on engraved depth and color difference. The bamboo culm was sliced into strips and then the strips were planed for obtaining smooth surfaces. Two kinds of Moso bamboo laminae, including without and with steam treatment were investigated. The results showed that the engraved depth became deeper for either higher laser power or a lower feed speed ratio. Moreover, the color difference values increased under a lower feed speed ratio and higher power, and resulted in a brownish color in the engraved zone. The average engraved depth and color difference values were 0.69–0.86 mm and 46.9–51.9 pixels by different engraving parameters, respectively. The engraved depth and color difference values could be predicted and estimated by regression analyses. Because of various desired engraving depths and color differences of product, we suggested that the fitting both laser's speed and power is important for valuable engraving and cost effective.