Method and plant for producing high-yield pulp from pulp chip material containing lignocellulose
US5164042A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 29, 1991 |
| Grant date | Nov 17, 1992 |
| Priority date | — |
| Expiry date | Oct 29, 2011 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21B1/021
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
In a method of producing high-yield pulp from pulp chip material containing lignocellulose the material is treated with steam in a steam treating station (1) for driving air out of the material and heating the latter. Heat treated material is mixed in a mixing station (8) with a liquid containing chemicals. The mixture of steam treated material and said liquid is transferred from the mixing station to an impregnation station (25) for impregnating the material by means of said chemicals. Impregnated material is supplied to a refining station (36) for refining the material. According to the invention the steam treated material is mixed with said liquid in proportions, such that the created mixture of material and liquid leaving the mixing station (8) assumes a flowing pumpable consistency. Further, said flowing mixture is pumped from the mixing station (8) to the impregnation station (25).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.