Method for de-inking printed paper
US5401360A · kind A · utility
13Cited by
11References
16Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 9, 1992 |
| Grant date | Mar 28, 1995 |
| Priority date | — |
| Expiry date | Sep 9, 2012 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02W30/64
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A two phase method for deinking printed waste paper having a mixture of printing inks is shown. The first phase is carried out in a neutral or slightly acid medium and the second phase in an alkaline medium. The first phase has disintegration, ink removal, and thickening steps. The second phase includes mixing and treating the thickened output from phase one with alkaline reagents, removal of any residual ink, and a second thickening. A third treatment of the removed ink and recycling of the media is also indicated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.