A non-destructive laser marking method comprising irradiating laser light on a thermosensitive color-forming layer formed by printing with a printing ink containing a leuco dye as a color former and an acidic substance as a color developer, and at least one background color formation inhibitor selected from the group consisting of a water-soluble amino acid, an ammonium salt of an inorganic acid, a pH buffer, and water. Laser marking can be achieved with low energy and at high speed while minimizing background color formation to provide a high-contrast color image.
一种非破坏性激光打标方法,包括在热敏成色层上照射激光,该热敏成色层是用印刷油墨印刷形成的,该印刷油墨含有作为
成色剂的白兰地
染料和作为
显色剂的酸性物质,以及至少一种背景成色
抑制剂,该
抑制剂选自由
水溶性
氨基酸、
无机酸的
铵盐、pH 缓冲剂和
水组成的组。激光打标可以低能耗、高速度实现,同时最大限度地减少背景色的形成,从而提供高对比度的彩色图像。