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WO1991009707A1 - Meule - Google Patents

Meule Download PDF

Info

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
Application number
PCT/FI1990/000313
Other languages
English (en)
Inventor
Carl-Olof Palm
Original Assignee
Oy Partek Ab
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Oy Partek Ab filed Critical Oy Partek Ab
Publication of WO1991009707A1 publication Critical patent/WO1991009707A1/fr

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
    • D21B1/04—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.
PCT/FI1990/000313 1989-12-29 1990-12-27 Meule WO1991009707A1 (fr)

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)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1989005712A1 (fr) * 1987-12-15 1989-06-29 Oy Partek Ab Meule

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1989005712A1 (fr) * 1987-12-15 1989-06-29 Oy Partek Ab Meule

Cited By (4)

* Cited by examiner, † Cited by third party
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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