Study of Latent Image Formation by Digital Decorative Printing

Abstract

UV inkjet printing (UV-IJP) enables digital decorative printing with controlled line heights to create latent images that become visible when the printed material is tilted. Gradual variations in line height can introduce gradation to the latent image, while the use of white ink, commonly employed in digital decoration, enhances its contrast. This technique is expected to significantly enhance the value of security-printed materials by providing on-demand printing and variable information capabilities.