| 摘要 |
<p>PROBLEM TO BE SOLVED: To obtain paper for preventing forgery, incapable of copying to whose color-copied color is different from that of an original by making fine hologram film piece to which micro-character hologram or micro-character diffraction grating is applied into paper stock. SOLUTION: A press plate made of nickel, forming fine uneven pattern constituting micro-character hologram or micro-character diffraction grating having <=1 mm diameter is pressed onto a hologram-forming layer on a transparent polyethylene terephthalate film while heating to prepare a hologram film piece having >=1 mm diameter. In paper-making process, the above hologram film piece is made into a paper stock to provide paper for preventing forgery, incapable of copying to hue equivalent to that of original manuscript by interference color of hologram film piece in color copying.</p> |
