SHEET FOR MULTICOLOR LASER MARKING, MARKED MULTICOLOR LASER MARKING SHEET AND PRODUCTION METHOD OF MULTICOLOR LASER MARKING SHEET

摘要

To achieve good wear resistance in a marked portion as well as to suppress blisters during laser marking for higher qualities, with regard to a sheet for multicolor laser marking, a multicolor laser marking sheet, and a production method of a multicolor laser marking sheet.SOLUTION: A sheet 11 for multicolor laser marking is constituted by: a first color-developing layer 12 comprising a laser light-absorbing material that receives laser light to develop a color and to generate heat; a second color-developing layer 13 comprising a thermosensitive color-developing material that develops a color different from the color developed by the first color-developing layer 12, by the heat generated by the first color-developing layer 12 and that has enough transparency to give transmission visibility; and a protective layer 14 that has enough transparency to give transmission visibility. A multicolor laser marking sheet 11A is configured to have: a first color-developed part 21 in the first color-developing layer 12 by irradiation with low-power laser light; and a second color-developed part 22 developed on a first color-developed part 21A developed in the first color-developing layer 12 by irradiation with laser light at the same wavelength as the above low-power laser light.SELECTED DRAWING: Figure 1