紅外線浮水印運用於紫外線平版印刷之研究-以盧彥勳球員卡為例

Abstract

面對全球化的產業競爭，紫外線平版印刷現已被廣泛應用於包裝及特殊材質 上，其主要特點是色彩鮮艷、乾燥速度快，高效率的產量。由於紅外線浮水印具防 偽功能，能使平版印刷技術創新，增加商品價值，因此本研究欲運用平版印刷方式 設計並製作具有資料隱藏功能的球員卡。於可見光下為球員卡，在紅外線偵測下能 呈現隱藏訊息的防偽功能，新防偽技術運用於塑膠卡片上，能提高產品附加價值與 達到大量輸出的目標。本研究的紅外線浮水印主要藉由數位半色調改進式數位過 網技術及色墨的光學特性所設計，其半色調網點以調幅（AM）網點與調頻（FM） 網點適當結合而成，主要為利用紅外線浮水印技術將隱藏之二維條碼（2D barcode） 浮水印置入球員卡內，藉由紅外光對不同色墨之穿透性差異，以紅外線偵測檢視浮 水印，經影像處理驗證加密效果，使用紫外線平版印刷技術，成功地製作兼具加值 與防偽效果的卡片。結果顯示PVC 塑膠材料卡片在肉眼觀察時是球員卡，在紅外 線偵測時，四色油墨中黑墨呈現深色影像，青、洋紅、黃色則呈現透明，可清楚地 辨認二維條碼。結合紫外線平版印刷技術與紅外線浮水印技術，未來將可進行大量 製作且依然能保有紅外線隱藏訊息的各式產品。To face the global competition, UV offset printing is now widely used in the packaging and special printing. Its main feature is colorful, fast-drying and high-efficiency production. Because of the security feature of the infrared watermark, it can make lithographic technology innovative and value-added. Therefore, this study is to use lithography to produce the player’s card with the hidden information. With the infrared, detection of the hidden messages which having security and anti-counterfeiting feature can be observed on plastic cards. It also improves product’s value and achieves the goal of mass production. The halftone dots are combined with amplitude modulation (AM) dots and frequency modulation (FM) dots. The two-dimensional bar code (2D barcode) watermark is embedded into the player’s card by the infrared technology. By ultraviolet lithography, the card possesses value-added and anti-counterfeiting features. Results show that the hidden watermark on the player cards are detected by infrared, and black ink shows dark image, while cyan, magenta and yellow inks show transparent. The hidden two-dimensional bar code can be clearly identified under infrared detection, and it will be mass-produced and be able to contain hidden messages.