Combining Techniques to Improve Security

IOTA member Pura Group’s ‘Combination Hologram Technology’ (CHT) merges classical optical origination with computer-generated holography (CGH) in a single, production-ready master – raising counterfeit resistance without asking converters to retool their embossing lines.

The method co-masters analogue and digital holography so that their very different optical signatures become a deliberate security advantage.

The workflow runs in three stages. First, a conventional master is made by making an optical recording into a photosensitive film using a 3D model or 2D film as the object. The image from the developed master is reconstructed and then recorded onto a secondary photosensitive film.

In a separate step, a computer-generated hologram is created with embedded security features such as microtext, multiple image channels, lens effects, and surface reliefs.