Title:
セルロースパルプの製造方法
Document Type and Number:
Japanese Patent JP4280636
Kind Code:
B2
Abstract:
The method is for the manufacture of cooked cellulose pulp in which the starting material, preferably chips, undergoes a successive increase in temperature towards cooking temperature. This is done while the chips are first treated in a pre-treatment zone in which the main part, greater than 50%, of fresh white liquor necessary for the cooking stage is added, after which this alkali-rich treatment fluid is withdrawn and replaced to a major extent by black liquor. The alkali-rich treatment fluid that has been withdrawn after the pre-treatment stage is then added to the cooking stage, which is why the addition of fresh white liquor to the cooking stage is reduced to an equivalent amount. Maximal yield-enhancing effect is obtained using poly-sulphide-rich white liquor during the pre-treatment at a temperature in the interval 60±40° C. and retention time in the interval 2-60 minutes, preferably 2-10 minutes.
Inventors:
Lindstrom, Michael
Snakeness, vaider
Snakeness, vaider
Application Number:
JP2003558264A
Publication Date:
June 17, 2009
Filing Date:
December 13, 2002
Export Citation:
Assignee:
Metso Fiber Karlstad Activolag
International Classes:
D21C1/06; D21C3/22
Domestic Patent References:
| JP3130482A | ||||
| JP2002523640A | ||||
| JP2001527605A | ||||
| JP9003787A |
Foreign References:
| US3303088 |
Attorney, Agent or Firm:
Takao Hamano
Morita Tetsuji
Teruichi Hirai
Morita Tetsuji
Teruichi Hirai