應用田口方法探討數位熱轉印製程最適化參數

Optimal Parameters for Digital Heat Transfer-printing by Taguchi Method

洪國倫

指導教授 ： 周遵儒博士

國立臺灣師範大學/科技學院/圖文傳播學系/碩士(2011年)

摘要

國內印刷業適逢轉型的階段，對跨媒材色彩管理需求方殷，熱昇華轉印結合數位印刷的色彩管理涉及轉印加工在不同媒材之間的作用，若直接套用常規描述檔進行印刷製作，容易發生色差的品質瑕疵；而以傳統實驗計劃法進行色彩描述檔製作，則容易造效率不彰及成本損失。
數位熱昇華轉印系統可概分成影像轉譯器與噴墨印表機及轉印機三個部份，本研究在設備描述檔製作流程中導入田口方法之直交表規劃與S/N比計算之手法，探討熱昇華轉印加工參數對色彩品質特性(色差值)的影響，透過田口方法之量化實驗與綜合分析發現：熱昇華轉印運用於鋁板上之最適參數組合為：轉印溫度為170℃；轉印時間為40秒；轉印壓力為5 Kg/cm2，運用以上最適參數組合於設備描述檔製作流程，其平均色差相較於使用初始設計製作之描述檔，其色差值由10.29個ΔE下降為7.89個ΔE，改善率為23.32%；品質損失比率為58.68%，顯示因設備描述檔與加工參數設備設定不當所造成品質損失可降低41.32%；另觀察六角形色域圖之六個主要顏色，於最適組合之下，青(C)洋紅(M)黃(Y)紅(R)綠(G)藍(B)之a*b*值均向理想值靠近，顯示利用田口方法可得明顯的色差改善效果。研究亦發現轉印加工參數的影響，以轉印時間之效應最為明顯，其因子效應為1.62個ΔE，在轉印過程中應注意時間的控制。

關鍵字

色彩描述檔 ； 熱昇華轉印 ； 田口方法

並列摘要

Since the printing industry is transforming, the urge for color management among various materials is much higher than before. Digital dye-sublimation thermal printing has the advantage of producing good surface printing results even on materials not absorbing inks, but the printing results are dominated by the operating parameters. If performing the process using default ICC profiles, the color mismatching could be pretty serious. However, applying traditional experiment design methods to generate proper color profiles is, generally speaking, not cost and time efficient.
Digital dye-sublimation thermal printing equipments can be roughly divided into 3 sub-systems: raster image processor, dye-sublimation ink jet printer, and heat stamping machine. In my research, the Taguchi methods were used to find the optimal operating parameters and then embed them into the ICC profiles, such that the printing quality could be improved with fewer experiments performed as long as lower the cost for making optimal profiles. It was found that, for aluminum plates, the optimal parameters of dye-sublimation thermal printing are 170℃ for temperature, 40 seconds for time, and 5 ㎏/㎠ for pressure. The profiles made with these parameters, comparing to those with manufacturer's recommendations, reduced the ΔE from 10.29 to 7.89, which was an 23.32% improvement. The quality loss due to the imprecise ICC profiles and improper operating parameters was also decreased by 41.32%. In addition, the a*b* values on the color gamut for the 6 prime colors -- cyan, magenta, yellow, red, green, and blue -- printed with optimal parameters were all getting closer to the ideal values. Besides, it was also found that the stamping time, among all operating parameters, affects the ΔE most. The effectiveness factor for stamping time was 1.62 ΔE, which means precise control of time in the process is critical. It was concluded that, by applying the Taguchi methods, it is an effective and efficient approach for finding the optimal parameters that can be used in generating proper ICC profiles to improve the quality and reduce the ΔE.

並列關鍵字

ICC profile ； dye-sublimation thermal printing ； Taguchi Method

參考文獻

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