WO1991009707A1 - Meule - Google Patents
Meule Download PDFInfo
- Publication number
- WO1991009707A1 WO1991009707A1 PCT/FI1990/000313 FI9000313W WO9109707A1 WO 1991009707 A1 WO1991009707 A1 WO 1991009707A1 FI 9000313 W FI9000313 W FI 9000313W WO 9109707 A1 WO9109707 A1 WO 9109707A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- grits
- grinding
- grindstone
- grains
- grinding grains
- Prior art date
Links
- 239000011159 matrix material Substances 0.000 claims abstract description 14
- 238000004519 manufacturing process Methods 0.000 claims abstract description 5
- 229920001131 Pulp (paper) Polymers 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 4
- 238000005245 sintering Methods 0.000 claims description 2
- 239000000835 fiber Substances 0.000 description 6
- 239000002023 wood Substances 0.000 description 4
- 239000000919 ceramic Substances 0.000 description 3
- 229920002522 Wood fibre Polymers 0.000 description 2
- 229920005610 lignin Polymers 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000002025 wood fiber Substances 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
- 229910010271 silicon carbide Inorganic materials 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
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
- D21B1/04—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
- D21B1/14—Disintegrating in mills
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
- B24D3/00—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents
- B24D3/02—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent
- B24D3/04—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent and being essentially inorganic
- B24D3/12—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent and being essentially inorganic water-setting, e.g. concrete
Definitions
- the invention relates to a grindstone intended for the production of woodpulp, the grinding surface of said grindstone essentially comprising grinding grains bound to a matrix and sintered together from so called grits.
- the structural elements called grits herein ⁇ below are onograins, i.e. fine crushed aggregate of a mineral, usually aluminum oxide or silicon carbide. Thus they are not composed of smaller structural ele ⁇ ments. On account of the crushing, they are very sharp-edge .
- grit hereinbelow is the smallest indiv ⁇ isible element of the actual grinding material.
- Today grindstones usually have a matrix of a ceramic material, but the matrix may also be of con ⁇ crete; Finnish Patent 75 611 discloses an advantage ⁇ ous grindstone with a concrete matrix, the grinding surface of which can be regarded as self-sharpening.
- Ceramic grindstones must be smoothed and sharp ⁇ ened prior to being taken into use and later at pre ⁇ determined intervals, in which connection grooves of a desired depth are produced in the grinding surface with a special tool.
- the portions of the grinding surface which are loc ⁇ ated between the grooves and which actually grind the wood become so coarse that they must be separately ground fine prior to the use of the grindstone for groundwood pulp production, or one has first to ac- cept poor-quality groundwood pulp for a period of time.
- the portions of the grinding surface located between the grooves gradually wear away to the level of the bottom of the grooves during the grinding process, new very sharp-edged grits will emerge in the grinding surface, which for some time, before appropriate wearing out, will disconnect wood fibers in an undesired manner by tearing.
- the grindstone according to Finnish Patent 75 611 has the significant advantage over ceramic grindstones that the expensive sharpening of the stone is eliminated, but despite self-sharpening the grits coming up in the grinding surface are likewise initially too sharp.
- the object is presently to provide a novel grindstone eliminating the above-stated drawback.
- the grindstone of the invention is mainly char- acterized in that the grinding grains include grits the edges of which have been rounded prior to the binding thereof to the matrix.
- the dis ⁇ tribution of the grits in the grinding surface cor ⁇ responds to a grinding frequency of about 50 kHz.
- the op ⁇ timum condition is achieved during the entire grind ⁇ ing process according to the prevalent grinding the ⁇ ories, in which condition the fibers of the wood are subjected to moderate impacts of compression and ex- pansion at a frequency of about 50 kHz, so that the lignin in the wood is softened at an elevated temper ⁇ ature and the wood fibers are disconnected without being damaged.
- the grinding grain employed in the grindstone according to the invention may be produced from sharp-edged grits. Sharp-edged grits of a suitable size and quality are selected. By directing grits of this kind at a suitable speed through a plasma flame or other hot flame, the sharp edges of the grits can be melted so that they are rounded off. Such a method can be applied e.g. to the sharp-edged grits employed in accordance with WO publication 89/05712.
- the grits obtained which have rounded edges are sintered into grinding grains according to the inven- tion, which grinding grains are preferably bound to a matrix of compacted concrete.
- the combination has the appearance of the combination described in WO pub ⁇ lication 89/05712.
- the important and de- cisive difference is now that the grits have rounded edges from the start and that the grinding grains produced therefrom by sintering are embedded in a concrete matrix in order to attain the above-stated impact frequency of 50 kHz.
- the grinding grains ac- cording to the invention are about 5-10 mm in length and have a diameter of about 2-4 mm at the thickest part thereof.
- the grits are sintered to one another very strongly on account of ceramic binding, and the binding of the entire grinding grain to the concrete matrix is also very strong owing to the greater sur ⁇ face and the irregular shape of the grinding grain.
- Individual grits having rounded edges cannot be dir ⁇ ectly embedded in the concrete matrix, since they would not stick to the matrix on account of their small surface. Yet this fact is utilized in that by means of such individual grits having rounded edges, disposed between grinding grains and fix ⁇ d to a matrix, the grooves produced between the grinding grains can be optimized so that they advantageously serve as flush-away passages for the disconnected fibers.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Polishing Bodies And Polishing Tools (AREA)
Abstract
Nouvelle meule destinée à la fabrication de la cellulose et permettant d'obtenir de la pâte mécanique de meilleure qualité. La surface de meulage de la meule comporte des grains de meulage liés à une matrice en béton agglomérée à partir de ce qu'il convient d'appeler des graviers. Chaque gravier des grains de meulage présente des bords arrondis.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FI896334 | 1989-12-29 | ||
FI896334A FI82491C (fi) | 1989-12-29 | 1989-12-29 | Slipsten. |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1991009707A1 true WO1991009707A1 (fr) | 1991-07-11 |
Family
ID=8529613
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FI1990/000313 WO1991009707A1 (fr) | 1989-12-29 | 1990-12-27 | Meule |
Country Status (3)
Country | Link |
---|---|
AU (1) | AU6908991A (fr) |
FI (1) | FI82491C (fr) |
WO (1) | WO1991009707A1 (fr) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2006128960A1 (fr) * | 2005-06-03 | 2006-12-07 | M-Real Oyj | Procede et appareil de defibrage mecanique du bois |
US8167962B2 (en) | 2007-04-10 | 2012-05-01 | Saint-Gobain Abrasives, Inc. | Pulpstone for long fiber pulp production |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1989005712A1 (fr) * | 1987-12-15 | 1989-06-29 | Oy Partek Ab | Meule |
-
1989
- 1989-12-29 FI FI896334A patent/FI82491C/fi not_active IP Right Cessation
-
1990
- 1990-12-27 AU AU69089/91A patent/AU6908991A/en not_active Abandoned
- 1990-12-27 WO PCT/FI1990/000313 patent/WO1991009707A1/fr unknown
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1989005712A1 (fr) * | 1987-12-15 | 1989-06-29 | Oy Partek Ab | Meule |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2006128960A1 (fr) * | 2005-06-03 | 2006-12-07 | M-Real Oyj | Procede et appareil de defibrage mecanique du bois |
US7819149B2 (en) | 2005-06-03 | 2010-10-26 | Metso Paper, Inc. | Method and apparatus for mechanical defibration of wood |
CN101208472B (zh) * | 2005-06-03 | 2013-01-16 | 美特索造纸公司 | 用于木材的机械纤维分离的方法和装置 |
US8167962B2 (en) | 2007-04-10 | 2012-05-01 | Saint-Gobain Abrasives, Inc. | Pulpstone for long fiber pulp production |
Also Published As
Publication number | Publication date |
---|---|
AU6908991A (en) | 1991-07-24 |
FI82491B (fi) | 1990-11-30 |
FI82491C (fi) | 1991-03-11 |
FI896334A0 (fi) | 1989-12-29 |
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