Method for crystallizing a filler in connection with a fiber web process, and an approach system for a fiber web machine
US8480854B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Feb 19, 2009 |
| Grant date | Jul 9, 2013 |
| Priority date | — |
| Expiry date | Dec 11, 2029 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21H17/70
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
The method of the present invention for crystallizing a filler, especially in order to precipitate calcium carbonate on the surfaces of solids in the short circulation of a fiber web machine by feeding carbon dioxide and lime milk to the liquid flow of the short circulation and allowing them to react with one another, is characterized in that the feed system, the mixing method and/or mixing rate of the chemicals are selected such that a size distribution of the calcium carbonate crystals suitable for the purpose is obtained. Moreover, the invention relates to an approach system for a fiber web machine applying this method, characterized in that it is provided with devices for feeding and mixing carbon dioxide and lime milk into the liquid flow at such a rate that the applicable size distribution of the calcium carbonate crystals is obtained.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.