| 摘要 |
<p>PROBLEM TO BE SOLVED: To prevent a forgery without necessity of complicated processing technology by forming a concealing part by retaining a non-concealing part at least part of both or one surface of a core layer, and forming a position of the non-concealing part as a transparent part. SOLUTION: Concealing parts 12A, 12B are provided at both sides of core layers 11A, 11B, and silver ink and white ink are sequentially silk screen printed on a layer for incorporating concealability and giving printability on a part except a transparent part 10a of the layers 11A, 11B except part punched in a rectangle (transparent part 10a). print layers 13A, 13B are formed on front and rear surfaces of the layers 12A, 12B, and formed by printing of gravure printing, screen printing or sublimable transfer. Thus, the layers 12A, 12B are formed on the transparent layers 11A, 11B except a non-concealing part. And since the position of the non-concealing part is formed to become the part 10a, in the case of copying it, the transparent part is not reproduced to prevent a forgery.</p> |
