| 摘要 |
<p>PURPOSE:To make a function display pattern hard to erase and easy to confirm the erasure of the display pattern visually by forming the function display pattern to the surface of the base material of a card main body by allowing display ink to chemically react with, to be dissolved therewith or to penetrate in the base material. CONSTITUTION:A function display pattern is formed to the surface of extremely fine porous polyester paper 1 forming a card main body by printing and applying ultraviolet curable ink to the surface of said polyester paper 1 and cured by the irradiation with ultraviolet rays to allow the ultraviolet curable ink to penetrate in the internal direction of the polyester paper 1 in a wavy state. This function display patter 2 can no be easily erased to the erasing action thereof aiming forgery or alternation and, even if sad pattern is erased forcibly, unevenness is generated on the surface of the polyester paper 1 and can be easily observed visually. The min. penetration depth (t) is set at least to 1mum or more, pref., 3mum or more.</p> |
