WO1991002838A1 - Process for the re-treatment of mechanical wood pulp - Google Patents
Process for the re-treatment of mechanical wood pulp Download PDFInfo
- Publication number
- WO1991002838A1 WO1991002838A1 PCT/EP1990/001378 EP9001378W WO9102838A1 WO 1991002838 A1 WO1991002838 A1 WO 1991002838A1 EP 9001378 W EP9001378 W EP 9001378W WO 9102838 A1 WO9102838 A1 WO 9102838A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- wood pulp
- steam
- wood
- treatment
- paper
- Prior art date
Links
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
- D21B1/00—Fibrous raw materials or their mechanical treatment
- D21B1/02—Pretreatment of the raw materials by chemical or physical means
- D21B1/021—Pretreatment of the raw materials by chemical or physical means by chemical means
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
- D21B1/00—Fibrous raw materials or their mechanical treatment
- D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
- D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
Definitions
- the invention relates to a method for the thermal aftertreatment of mechanically produced wood pulp, which is used for paper, cardboard and cardboard production.
- the wood pulp used in the paper and cardboard industry is said to have the highest possible level of splinter-free properties and good strength properties such as tear length, tear resistance and burst pressure as well as high volume and rigidity. For this reason, an attempt is made to produce a wood grind with a high degree of grinding and few chips on the grinder. On the other hand, the high degree of grinding, which is favorable for the strength values, causes a deterioration on the paper machine screen Drainage behavior so that the speed of the paper machine is limited. So-called drainage accelerators have become known, which are based on polyethyleneimine or
- Polyamidamine-epichlorohydrin base initially showed good success, but due to the closed-circuit water in the cardboard and paper mills and the consequent accumulation of the organic contaminants from the wood pulp, their effectiveness became less and less.
- the thickened wood pulp is first exposed to water vapor at a dry content of 10 to 50%, and then the resulting vapor vapor, if necessary. subtracted using suitable means, such as blowers or expansion devices, so that the dry content of the wood pulp is essentially not affected.
- the amount of steam used for the aftertreatment is dependent on the flow rate per unit time - -
- the regulation of the amount of steam can advantageously be controlled by the wood pulp suspension fed to the thickener, the consistency of which is known.
- the temperature of the wood pulp treated with steam is monitored and does not exceed 110 ° C., since otherwise a noticeable yellowing occurs with all the adverse effects on the end product.
- the temperature of the wood pulp treated with steam is therefore expediently used as a further control variable for measuring the amount of steam.
- the thermal aftertreatment can be carried out with conventional wet or saturated steam, advantageously saturated low-pressure steam with a temperature of 105 to 180 ° C. being used.
- the vapor pressure is in itself only determined by the amount of water vapor to be used. It is advantageously chosen between 1.1 and 8.0 bar, the pressure being able to be used in addition to the mixture with the ground wood if the feed elements for the groundwood are appropriately configured. Higher vapor pressures are not recommended due to the structural and constructive measures that are then required.
- the duration of the thermal aftertreatment is advantageously chosen between 0.5 and 60 minutes. It should also be taken into account here that a shorter residence time is selected at higher steam temperatures and dry contents of the wood pulp to be treated, in order to avoid damage to the fibers.
- the temperature of the wood pulp after steam treatment is also advantageously used here as a control variable.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Paper (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT90912647T ATE98711T1 (en) | 1989-08-25 | 1990-08-21 | METHOD OF POST-TREATMENT OF WOOD Pulp. |
NO920694A NO180018C (en) | 1989-08-25 | 1992-02-21 | Process for finishing abrasive pulp |
FI920774A FI101404B (en) | 1989-08-25 | 1992-02-21 | Method for finishing wood chips |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEP3928058.6 | 1989-08-25 | ||
DE3928058A DE3928058A1 (en) | 1989-08-25 | 1989-08-25 | METHOD FOR TREATING WOOD GRIND |
DD34363890A DD301791A7 (en) | 1989-08-25 | 1990-08-24 | METHOD FOR TREATING WOODEN SLIP |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1991002838A1 true WO1991002838A1 (en) | 1991-03-07 |
Family
ID=37728154
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP1990/001378 WO1991002838A1 (en) | 1989-08-25 | 1990-08-21 | Process for the re-treatment of mechanical wood pulp |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP0489066B1 (en) |
DD (1) | DD301791A7 (en) |
DE (1) | DE3928058A1 (en) |
ES (1) | ES2047945T3 (en) |
FI (1) | FI101404B (en) |
WO (1) | WO1991002838A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102007022749A1 (en) * | 2007-05-11 | 2008-11-13 | Voith Patent Gmbh | Lignocellulosic wood pulp |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2306303A1 (en) * | 1975-04-04 | 1976-10-29 | Yhtyneet Paperitehtaat Oy | METHOD AND DEVICE FOR THE PREPARATION OF HOT CRUSHED WOOD |
DE2825069B2 (en) * | 1977-06-08 | 1981-04-02 | Beloit Corp., 53511 Beloit, Wis. | Process and device for thermo-mechanical wood digestion |
-
1989
- 1989-08-25 DE DE3928058A patent/DE3928058A1/en not_active Withdrawn
-
1990
- 1990-08-21 WO PCT/EP1990/001378 patent/WO1991002838A1/en active IP Right Grant
- 1990-08-21 EP EP90912647A patent/EP0489066B1/en not_active Expired - Lifetime
- 1990-08-21 ES ES90912647T patent/ES2047945T3/en not_active Expired - Lifetime
- 1990-08-24 DD DD34363890A patent/DD301791A7/en unknown
-
1992
- 1992-02-21 FI FI920774A patent/FI101404B/en not_active IP Right Cessation
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2306303A1 (en) * | 1975-04-04 | 1976-10-29 | Yhtyneet Paperitehtaat Oy | METHOD AND DEVICE FOR THE PREPARATION OF HOT CRUSHED WOOD |
DE2825069B2 (en) * | 1977-06-08 | 1981-04-02 | Beloit Corp., 53511 Beloit, Wis. | Process and device for thermo-mechanical wood digestion |
Also Published As
Publication number | Publication date |
---|---|
FI920774A0 (en) | 1992-02-21 |
FI101404B1 (en) | 1998-06-15 |
DD301791A7 (en) | 1994-01-20 |
DE3928058A1 (en) | 1991-02-28 |
EP0489066A1 (en) | 1992-06-10 |
EP0489066B1 (en) | 1993-12-15 |
FI101404B (en) | 1998-06-15 |
ES2047945T3 (en) | 1994-03-01 |
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