Apparatus for security printing using toner particles
US5824447A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 8, 1997 |
| Grant date | Oct 20, 1998 |
| Priority date | — |
| Expiry date | Jul 8, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G21/04
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An apparatus for security printing of a document on a substrate, having a first and second side, comprising: PA1 i) means for feeding variable data in a predetermined digital format to printing stations, PA1 ii) at least two printing stations, for image-wise depositing, in accordance to the predetermined format of the variable data, toner particles on the substrate, PA1 iii) means for fusing the toner particles to the substrate, to form a fused toner image, characterized in that PA2 a) the apparatus comprises means for introducing security features in the document and PA2 b) the means for fusing the toner particles to the substrate comprise means for heating and melting the toner particles such that between the melting toner particles and the substrate a contact angle of at most 90.degree. is formed and leave at most 25 mg/m.sup.2 of an external releasing agent on the fused toner image.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.