| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a thermal paper sheet for concealing secret information which enables checking of the presence of erroneous printing due to an input mistake, a program mistake or the like, without peeling off upper paper given hiding property, for a certain time after printing, as to the result which is obtained by printing the information to be made secret, by a thermal printer, on a meter inspection slip or the like for city water, gas, electricity or others, and makes it impossible thereafter for a third person to see the concealed information unless he peels off the upper paper given the hiding property. <P>SOLUTION: The paper sheet 30 is constituted by adhering base paper 10 being thermal paper to the upper paper 20 with an adhesive layer 50, and a printing layer bringing about the hiding property is provided in a prescribed part of the back of the base paper 10, while a printing layer b bringing about the hiding property is provided in a prescribed part of the surface of the upper paper 20. Besides, a thermosensitive ink layer 40 which shows color fading in accordance with raising of temperature is provided in a prescribed part of the surface of the upper paper 20 so that it is laid on the printing layer b bringing about the hiding property. <P>COPYRIGHT: (C)2008,JPO&INPIT |
