An Experimental Study of Tone Value Increase Ratios on Various Hybrid Screen Combinations for Lithography and Flexography

• Main Authors: Chen, Shu-yu, 陳書宇
• Other Authors: Hsieh, Yung-Cheng
• Format: Others
• Language: zh-TW
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/61339857023327499878

碩士 === 國立臺灣藝術大學 === 圖文傳播藝術學系 === 98 === The Tone Value Increase (TVI) Ratios of four process colors seems to be a constant number, according to literatures. The TVI Ratios in this study means the ratios of TVI of 50% divided by TVI of 75% and TVI of 50% divided by TVI 25%. In order to meet this condition, the printing process has to be consistent. Therefore, the TVI Ratios can be used as a factor to evaluate the consistency of the printing process. In addition, the correlation between TVI Ratios and solid ink density will be evaluated. This proposed research used Descriptive Statistics, Independent Sample T Test, One-way Analysis of Variance, One-way ANOVA, Regression Analysis and Correlational Analysis. This proposed research is to define the target value and the tolerance of the TVI Ratios using Kodak/Creo Maxtone to make eleven hybrid screen combinations for offset and flexo printing processes on coated paper, uncoated paper and PVC. The best combination of the printing process and the substrate that results in a constant TVI Ratios will then be found. The next step is to use the combination to make the correlation between TVI Ratios and solid ink density is tested. If the correlation is significant, a prediction model will be established. As a result, this model will provide printers an easy and a convenient method to control their printing process, and to improve the printing quality. Specifications of the TVI Ratios will then be established to obtain a consistent printing process and help printers in Taiwan expand their markets oversea. To sum up, printers could use 1.2572±0.046 = 0.570 +0.909 ×（B Trapping）-3.518×（Y Gray）or 1.2572±0.046 = 2.453 - 0.666 × ( M density ) to measure tone value increase conveniently. This is an efficient tool to inspect stability of dot reproduction in printing production.