| 摘要 |
PROBLEM TO BE SOLVED: To prevent the sticking of a pressure sensitive adhesive to a cutting tool in cutting by disposing a coating layer containing a releasing agent on each cutting part of a substrate. SOLUTION: A detection mark 8 is a coating layer disposed on the rear side of thermal paper 2 and the coating layer is preferably formed by printing with a black ink because discrimination between total reflection (white) and total absorption (black) is facilitated in detection with an optical sensor and printing can visually be judged whether it is good or bad. A UV-curing ink is preferably used as the black ink because it does not use a harmful organic solvent, can be cured with a little energy in a short time and can form a coating film in such a way that a liquid releasing agent 9 is not separated. The liquid releasing agent 9 is previously kneaded in the UV-curing ink and dispersed as invisible fine particles. After curing, the releasing agent 9 is sealed in the coating film. Any material capable of forming a chemically inert film less liable to a change in viscosity and having high water repellency may be used as the releasing agent 9.
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