| 摘要 |
PROBLEM TO BE SOLVED: To provide a method of easily detecting a register mark corresponding to a colorless transparent ink layer.SOLUTION: A manufacturing process of a label 10 includes: a first process of forming a colorless transparent ink layer 14 partially on a label base material 11 by using ink containing ultraviolet absorbent, and forming a register mark 24 having a same composition as the ink layer; and a second process of irradiating the register mark 24 with ultraviolet rays, detecting the ultraviolet rays which are radiated on the register mark 24 and are absorbed partially by the ultraviolet absorbent, and acquiring positional information of the colorless transparent ink layer 14 on the label base material 11. |
