Belt-driven processes for producing optical effect layers
US10500889B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 20, 2015 |
| Grant date | Dec 10, 2019 |
| Priority date | — |
| Expiry date | Jul 30, 2035 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB42D25/41
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
The present invention relates to the field of the protection of value documents and value commercial goods. In particular, the invention relates to printing devices and processes for producing optical effect layers (OEL) comprising magnetically oriented magnetic or magnetizable pigment particles. In particular, the present invention provides processes for producing said OELs as anti-counterfeit means on security documents or security articles or for decorative purposes. The printing devices comprise a) an orienting device comprising an orientation means, said orientation means being either a magnetic field generating belt or a non-magnetic belt comprising magnetic field generating elements, said belt being driven by at least two rollers, and b) a hardening unit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.