SE8600615L - HIGH LIGHTNESS ASTADCOMMATED BY BLACKING OF MECHANICAL MASS, SUCH AS CHEMICAL-MECHANICAL MASS (CMP), CHEMICAL-THERMAL-MECHANICAL MASS (CTMP) AND SIMILAR - Google Patents
HIGH LIGHTNESS ASTADCOMMATED BY BLACKING OF MECHANICAL MASS, SUCH AS CHEMICAL-MECHANICAL MASS (CMP), CHEMICAL-THERMAL-MECHANICAL MASS (CTMP) AND SIMILARInfo
- Publication number
- SE8600615L SE8600615L SE8600615A SE8600615A SE8600615L SE 8600615 L SE8600615 L SE 8600615L SE 8600615 A SE8600615 A SE 8600615A SE 8600615 A SE8600615 A SE 8600615A SE 8600615 L SE8600615 L SE 8600615L
- Authority
- SE
- Sweden
- Prior art keywords
- mechanical mass
- pulp
- chemical
- ctmp
- cmp
- Prior art date
Links
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
- D21C9/10—Bleaching ; Apparatus therefor
- D21C9/1057—Multistage, with compounds cited in more than one sub-group D21C9/10, D21C9/12, D21C9/16
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Paper (AREA)
- Polysaccharides And Polysaccharide Derivatives (AREA)
- Joints Allowing Movement (AREA)
- Springs (AREA)
- Compositions Of Oxide Ceramics (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Electron Beam Exposure (AREA)
- Liquid Crystal Substances (AREA)
Abstract
Bleaching of a mechanical pulp, such as chemimechanical pulp (CMP), chemithermomechanical pulp (CTMP), and the like, achieves high brightness. A lignocellulose mechanical pulp is subjected to two different peroxide (P) stages (12, 18), and a hydrosulfite (dithionite) (T) stage (20). A P-P-T sequence is preferred (although a P-T-P sequence also produces good results). Bleaching is typically accomplished in all stages at a consistency of between about 8-30%. Between the peroxide stages, the pulp is preferably pressed (19). Between a peroxide stage and a subsequent hydrosulfite stage the pulp is preferably pressed (19 min ), and the pH reduced to between about 5.5-6.0 when diluting with SO2 water (26). The P-P-T bleaching sequence results in pulp with unexpectedly high brightness, brightness levels of about 83% ISO, and greater, being possible.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US70200085A | 1985-02-15 | 1985-02-15 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| SE8600615D0 SE8600615D0 (en) | 1986-02-12 |
| SE8600615L true SE8600615L (en) | 1986-08-16 |
Family
ID=24819495
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| SE8600615A SE8600615L (en) | 1985-02-15 | 1986-02-12 | HIGH LIGHTNESS ASTADCOMMATED BY BLACKING OF MECHANICAL MASS, SUCH AS CHEMICAL-MECHANICAL MASS (CMP), CHEMICAL-THERMAL-MECHANICAL MASS (CTMP) AND SIMILAR |
Country Status (8)
| Country | Link |
|---|---|
| EP (1) | EP0191756B1 (en) |
| JP (1) | JPS61245392A (en) |
| AT (1) | ATE39714T1 (en) |
| BR (1) | BR8600637A (en) |
| DE (1) | DE3661641D1 (en) |
| FI (1) | FI85729C (en) |
| NO (1) | NO166244C (en) |
| SE (1) | SE8600615L (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE455203B (en) * | 1986-10-20 | 1988-06-27 | Eka Nobel Ab | PROCEDURE FOR THE CONTROL OF PEROXID WHEATING OF MASS |
| FR2622221A1 (en) * | 1987-10-22 | 1989-04-28 | Atochem | PROCESS FOR BLEACHING PASTA |
| FR2639371B1 (en) * | 1988-11-24 | 1995-04-14 | Atochem | PROCESS FOR THE BLEACHING OF DEINKED PASTA |
| CA1340348C (en) * | 1989-03-23 | 1999-01-26 | Michel Barbe | Bleaching process for the production of high bright pulps |
| JPH076148B2 (en) * | 1989-06-27 | 1995-01-30 | 新王子製紙株式会社 | Bleaching method for lignocellulosic material |
| BE1004630A3 (en) * | 1990-10-17 | 1992-12-22 | Interox Internat Sa | Method for preservation of strength characteristics of paper pulp chemicals. |
| GB9212926D0 (en) * | 1992-06-18 | 1992-07-29 | Morton Int Inc | Method of bleaching paper pulp |
| US5464501A (en) * | 1993-04-06 | 1995-11-07 | Societe Anonyme Pour L'etude Et L'exploitation L'air Liquide, Des Procedes Georges Claude | Bleaching recycled pulp with a reductive-oxidative sequence |
| IT1296947B1 (en) * | 1997-12-10 | 1999-08-03 | Donato Fausto De | COMPOSITION FOR WHITENING THE WOOD PASTE AND RELATED PROCEDURE |
| EP1418269B1 (en) * | 2002-11-05 | 2009-02-11 | Rohm And Haas Company | Method for brightening virgin mechanical pulp |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1820502A (en) * | 1928-06-30 | 1931-08-25 | Champion Fibre Company | Bleaching cellulose pulp |
| US2290601A (en) * | 1940-02-16 | 1942-07-21 | Du Pont | Bleaching of ground wood pulp with preliminary bisulphite treatment |
| US2862784A (en) * | 1955-03-04 | 1958-12-02 | Virginia Smelting Company | Oxidative-reductive multi-stage bleaching of ground wood pulp |
| JPS5679798A (en) * | 1979-12-03 | 1981-06-30 | Mitsubishi Gas Chemical Co | Production of bleaching machine pulp |
| JPS575992A (en) * | 1980-06-04 | 1982-01-12 | Mitsubishi Gas Chemical Co | Bleaching of high yield pulp by peroxide |
| CA1249402A (en) * | 1984-12-21 | 1989-01-31 | Pulp And Paper Research Institute Of Canada | Multistage brightening of high yield and ultra high- yield wood pulps |
-
1986
- 1986-02-12 AT AT86890030T patent/ATE39714T1/en not_active IP Right Cessation
- 1986-02-12 DE DE8686890030T patent/DE3661641D1/en not_active Expired
- 1986-02-12 SE SE8600615A patent/SE8600615L/en unknown
- 1986-02-12 EP EP86890030A patent/EP0191756B1/en not_active Expired
- 1986-02-14 FI FI860688A patent/FI85729C/en not_active IP Right Cessation
- 1986-02-14 JP JP61030582A patent/JPS61245392A/en active Pending
- 1986-02-14 BR BR8600637A patent/BR8600637A/en not_active IP Right Cessation
- 1986-02-14 NO NO860546A patent/NO166244C/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61245392A (en) | 1986-10-31 |
| NO166244B (en) | 1991-03-11 |
| EP0191756A1 (en) | 1986-08-20 |
| SE8600615D0 (en) | 1986-02-12 |
| ATE39714T1 (en) | 1989-01-15 |
| FI860688A0 (en) | 1986-02-14 |
| FI85729C (en) | 1992-05-25 |
| BR8600637A (en) | 1986-11-04 |
| NO166244C (en) | 1991-06-19 |
| FI860688A (en) | 1986-08-16 |
| FI85729B (en) | 1992-02-14 |
| DE3661641D1 (en) | 1989-02-09 |
| EP0191756B1 (en) | 1989-01-04 |
| NO860546L (en) | 1986-08-18 |
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