| 摘要 |
PURPOSE:To form a hidden image with excellent durabilities of various types even when it is applied to a hidden printing for a frequently handled card, etc., by a method wherein a hidden image is formed by laminating a protective layer and heat transfer ink layer in this listed order, at one part on one surface of a base film, and the ink layer consists of a resin and colorless fluorescent agent. CONSTITUTION:At a part of a base film, a protective layer is formed. The protective layer is transferred to a material to be transferred at the same time when an ink layer is transferred, and covers the ink layer after the transfer, and functions to improve various types of durabilities such as wear resistance, sweat resistance and chemical resistance, etc. The ink layer which is formed on the protective layer consists of a resin and fluorescent agent. For the resin, e.g. ethylene-vinyl acetate copolymer (EVA), etc., is used. Also, for a colorless fluorescent agent to be applied, e.g. a generally known fluorescent whiting agent such as silbene agent, etc., is used. Such fluorescent whiting agents are dissolved in the resin, which is a binder, can emit sufficient fluorescence under ultraviolet rays by an extremely low concentration, e.g. at a concentration of 0.01-1wt.%, and are colorless and transparent under a normal condition and cannot be recognized at all by the naked eye. |
