臺灣博碩士論文加值系統

網版業界在選用印墨時會針對被印材性質與使用狀況而決定，但對於在精緻化要求的色彩表現，卻成為被犧牲的對象。一般網版業者都是以一般線數的印刷，而高線數印刷複製能力不足，因此，若具有高線數生產能力，將可提升在業界的競爭能力。
網版使用油墨的媒材主要分成三類：溶劑型印墨（Solvent-based inks）、水性印墨（Water-based inks）以及紫外光（Ultraviolet curing inks）印墨。傳統的溶劑型印墨雖然在印刷複製能力與色彩表現上以為大眾一般人所能接受，但其乾燥速度慢，又不環保。水性印墨的確減少環保造成的污染，但乾燥速度更慢，被印材料限制多，尤其在紙張以外的特殊印材上不適用。而UV型印墨是目前發展趨勢，乾燥速度快產能高，但其成本較高。
本研究主要目的為探討三種不同印墨對印刷品質特性的影響，並找出哪一種印墨最適合高線數網版印刷。
本研究採真實驗研究法，以三個自變項（溶劑型印墨、水性印墨、UV印墨）、兩種線數（75線、120線）來探討其印刷品質特性（網點擴大、滿版濃度、印刷反差、疊印能力與色域範圍）並交叉比較，期能得到不同性質印墨之間的差異性。每種印墨在不同線數各印刷100張P.P.合成紙，共計600張印刷品，其中每一種取樣35張，並使用分光密度儀來量測其印刷品質特性。
根據研究結果如下：
1. 在一般線數與高線數印刷時，以滿版濃度、疊印能力為最優先考慮之品質特性，應採用紫外光印墨。
2. 以網點擴大為最優先考慮之品質特性，應採用水性印墨。
3. 若以印刷對比為最優先考慮之品質特性，則應採用溶劑型印墨。
4. 比較三種不同性質印墨的印刷品質後，最適合高線數印刷為紫外光印墨，但在網點擴大的部分，以水性印墨表現較佳。
另外，本研究發現以滿版濃度、網點擴大、印刷對比為最優先考慮之品質特性而言，應採用75線之網版印刷解析度。其印刷品質比120線之解析度為佳。

Ink properties are classified into three major types: solvent-based inks, water-based inks, and ultraviolet-curing inks. The solvent-based ink is more popular due to its stable printing quality and color reproduction, but its drying speed is rather slow and it is not environmental friendly. The water-based ink reduces pollution greatly and chimes with the environmental consciousness but its substrates are quite limited. The ultraviolet- curing ink has great advantages in production efficiency, but its production cost is much higher than the other two inks. From the viewpoint of business management, it is important to enhance the company’s competitive edge by improving the printing quality and raising the production.
The first purpose of this research was to investigate how solvent-based inks, water-based inks, and ultraviolet- curing inks, in terms of ink properties, influence screen print quality. The second purpose of the study was to explore which ink, among the three, is the most suitable for fine-line halftone screen printing.
This study was an experiment research in nature. The dependent variables of the study were print qualities which were solid ink density, tone value increase (at 10%, 25%, 50%, 75%, and 90% tints), print contrast, and ink trapping on the P.P. compound substrates. The independent variables were various types of ink properties and two kinds of line resolutions. For ink properties , there were solvent-based inks, water-based inks, and ultraviolet curing inks. As for line resolutions, they were general line halftone (75Lpi) and fine line halftone(120Lpi) for screen printing.
One hundred printed P.P. compound substrates were collected for each press run. Consequently, a total of 600 prints were gathered for the six runs; then, 35 sheets of each run (100 prints) were systematically randomly sampled for a total sample size of 210 (6*35). Finally, an X-Rite reflective spectrodensitimeter was applied to measure the print quality.
The overall results are as follows:
1. The water-based ink is the optimum one to reproduce halftone dots, in terms of tone value increase, among the three inks in both general halftone and fine line halftone.
2. The ultraviolet curing ink is the optimum one to print solid ink density and trapping among three inks both in general halftone and fine line halftone.
3. The solvent-based ink is the optimum one to reproduce print contrast among the three inks both in general halftone and fine line halftone.
4. Comparing the three ink properties, this study found that the ultraviolet curing ink is a better choice to print fine line halftone, but for tone value increase, the water-based ink is a better choice.
Furthermore, printing with general halftone (75Lpi) results in better quality in solid ink density, tone value increase, and print contrast than printing with fine line halftone.

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