A Study of Photopolymer Plate Printability of Pad Printing in Polypropylene

• Main Authors: Ding-nan Li, 黎定南
• Other Authors: Chong-Hwi Chen
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/35333642390204418070

碩士 === 世新大學 === 圖文傳播暨數位出版學研究所(含碩專班) === 97 === In accordance with the global trend of environmental protection, the traditional metal plate can be replaced by the Photopolymers one during the pad printing processes. The advantages of Photopolymers plate are rapid in plate-making, well in abrasion resistance and low in environmental contamination. The general direction of the pad print industry development is moving to a particular type of printing which is very friendly to environment and really suitable to handle the varied demands with small quantity in products. Therefore, it is perfectly applicable to produce the specific products with highly additional values. The aim of this study was to examine the printability of Photopolymers plate applied to polyacrylonitrile material in pad-print. There were two factors controlled-- one was the depth of image grave on plate and the other was the value of dyne of substrate surface-- in order to find out how the adhesion of the printed images was affected. This study adopted the factorial experiment design with two factors: the depth of image grave on plate and the value of dyne of substrate surface. And each factor contained five levels. The deeper image grave the plate had, the more the ink would be held; consequently, the thicker the ink film was transferred from plate to the substrate. Finally, the thickness of ink film and the surface energy of substrate covered by ink were found that they had observable interaction to the performance of ink adhesion. The results of this investigation were below: 1. The adhesion goes up with the increased dyne value correspondingly. There is a positive correlation between the ink adhesion and the surface energy of substrate. 2. The adhesion descends according to the ascended depth of image grave. There is a negative correlation between the ink adhesion and the depth of image grave. 3. The depth of image grave and the surface energy of substrate interacted with the performance of ink adhesion respectively. 4. The optimal formula of ink adhesion is as the follow: Ink adhesion = 17.449＊dyne value - 7.394＊grave depth + 36.616 And the recommended settings of grave depth and surface energy of substrate are below. ** Grave depth of images on plate: 20μm~30μm ** Surface energy of substrate: 38dynes/cm²