| 摘要 |
PURPOSE:To obtain a thermal recording sheet incapable of being transferred with recording pictures even when copied by a duplicator after recording by a method in which a netted printing layer having a specific areal ratio and a specific screen line number is formed by a color ink on a recording layer, and the reflection factor characteristics between the colored portion and netted printing layer after recording are equalized according to the spectral characteristics of the duplicator. CONSTITUTION:The areal ratio when forming a netted printing layer is controlled to 5-95%, and the screen line number is also controlled to 65-600. Thermally recorded pictures 4 on a thermal recording sheet by the thermal treatment of a thermal head are visualized through the aperture between the net points of the netted printing layer 3. When the thermal recording sheet after being recorded is copied by a duplicator, since the reflection factor characteristics of the pictures 4 are equalized with those of the layer 3 according to the spectral characteristics of the duplicator, the sensitizer of the duplicator becomes responsible to reflected light from the picture portion and background of the sheet and the copy becomes of solid black color. The sheet can have incapability of being copied. |
