Internal paper sizing improvements
US6540877B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 8, 2002 |
| Grant date | Apr 1, 2003 |
| Priority date | — |
| Expiry date | Apr 8, 2022 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21H17/66
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
An improvement is disclosed over conventional internal sizing of stock furnish for papermaking, wherein alum is added to the thick paper stock and the long retention time permits complete reaction with the fibers. The invention process permits successfully adding novel aluminum rosinate size composition unconventionally in thin stock furnish, where retention times are on the order of less that 1 minute. The highly charged aluminum rosinate size is able to be quickly adsorbed onto the fiber surfaces to permit surprisingly efficient sizing in thin stock. The quick sizing avoids concern with rising pH over time (in conventional thick stock application) and increases sizing efficiency.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.