Process for recycling and reconstituting flexographic inks
US5017291A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 24, 1990 |
| Grant date | May 21, 1991 |
| Priority date | — |
| Expiry date | Oct 24, 2010 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC02F1/441
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A process for recycling and reconstituting flexographic inks from wash water resulting from cleaning the rollers and other components of a flexographic printing press. The process includes the steps of circulating the wash water through a cross-flow ultrafilter to separate an optically-clear filtrate from a first concentrate containing suspended ink solids, bacteria, and macromolecules. Thereafter, the filtrate is directed through a reverse-osmosis filter to separate from the filtrate a second concentrate containing dissolved ink components and the remaining bacteria. The first and second concentrates are then combined together with a compatible biocidal agent to form a stable, biologically-inactive additive that is mixed with fresh ink concentrate to form pressready flexographic printing ink.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.