Process for making high-strength, high-yield sulfite-modified thermomechanical pulp and a linerboard composition produced therefrom
US4145246A · kind A · utility
29Cited by
5References
29Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 19, 1976 |
| Grant date | Mar 20, 1979 |
| Priority date | — |
| Expiry date | Jul 19, 1996 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21C3/06
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A high-strength, high-yield sulfite-modified thermomechanical pulp is formed by subjecting lignocellulose to multistage mechanical attrition, the first stage being conducted at elevated temperature and pressure and the second stage being run under atmospheric conditions. A sulfite chemical is added to the lignocellulose prior to the second stage, the lignocellulose being sulfonated so that a percent bound sulfur level of at least about 0.15% is provided. A novel linerboard composition is unexpectedly produced employing replacement quantities of the above described pulp.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.