Paper web and a method for the production thereof
US6391154B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 16, 1998 |
| Grant date | May 21, 2002 |
| Priority date | — |
| Expiry date | Sep 16, 2018 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21H19/385
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
The invention concerns a method for producing a paper web. According to the method a stock is produced from the fibrous raw material and the stock is formed to a web which is dried on a paper machine. According to the invention the stock is formed from a mechanical pulp prepared from wood material of the Populus family and from bleached chemical spruce pulp, whereby the amount of the mechanical pulp is 20 to 70 weight-% and the amount of the bleached chemical softwood pulp is 80 to 30 weight-% of the dry matter of the stock. It is preferred to use an aspen pulp, over 70% of the fiber fractions of which comprise fiber fractions +100, +200 and −200, and the proportion of the −200 fraction is 45% or less. A coated fine paper can be produced from the paper web whose properties are better than those of a traditional fine paper having the corresponding bulk and grammage, on the same capacity level the paper produced by the invention will give a yield gain of up to more than 20%.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.