FI82491B - SLIPSTEN. - Google Patents
SLIPSTEN. Download PDFInfo
- Publication number
- FI82491B FI82491B FI896334A FI896334A FI82491B FI 82491 B FI82491 B FI 82491B FI 896334 A FI896334 A FI 896334A FI 896334 A FI896334 A FI 896334A FI 82491 B FI82491 B FI 82491B
- Authority
- FI
- Finland
- Prior art keywords
- grinding
- grits
- matrix
- sharp
- grit
- 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
- D21B1/04—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
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)
Description
1 824911 82491
HiomakiviWhetstone
Keksinnön kohteena on puumassan valmistukseen tarkoitettu hiomakivi, jonka hiomapinta olennaisesti muodos-5 tuu matriisiin sidotuista ja hiomarakeista yhteensintra-tuista nk. griteistä.The invention relates to an abrasive stone for the production of wood pulp, the abrasive surface of which essentially consists of so-called grites bound to the matrix and sanded together.
Hiomarakeet ovat yleensä alumiinioksidia tai pii-karbidia, ja rakeet on valmistettu murskaamalla haluttuun raekokoon, jolloin rakeet muodostuvat erittäin teräväsär-10 mäisiksi. Nykyisin hiomakivissä matriisi on tavallisesti keraamista materiaalia mutta matriisi voi myös olla betonia; FI-patenttijulkaisussa 75611 on esitetty edullinen betonimatriisinen hiomakivi, jonka hiomapinta voidaan katsoa itseterottuvaksi.The abrasive grains are generally alumina or silicon carbide, and the granules are made by crushing to the desired grain size, resulting in a very sharp-edged grain. Today, in grindstones, the matrix is usually a ceramic material but the matrix can also be concrete; FI patent publication 75611 discloses a preferred concrete matrix grinding stone, the grinding surface of which can be considered to be self-sharpening.
15 Keraamiset hiomakivet on ennen käyttöönottoa ja myöhemmin määrävälein tasoitettava ja teroitettava, jolloin hiomapintaan muodostetaan halutun syvyisiä uria eri-koistyökalun avulla. Näitä uria muodostettaessa urien väliset hiomapinnan osat, jotka varsinaisesti hiovat puuta, 20 tulevat niin karkeiksi, että ne on erikseen hienonnettava ennen hiomakiven käyttöä hiokkeen valmistukseen tai on joksikin aikaa aluksi tyydyttävä huonolaatuiseen hiokkeeseen. Joka tapauksessa, kun urien väliset hiomapinnan osat hiontaprosessin aikana vähitellen kuluvat urien pohjia 25 myöten, hiomapintaan "nousee" uusia hyvin teräväsärmäisiä hiomarakenteita, jotka jonkin aikaa, ennen sopivaa kulumista, irrottavat puukuituja ei-toivotulla tavalla repimällä.15 Ceramic grindstones must be leveled and sharpened before use and at regular intervals thereafter, in which case the desired depth of groove is formed in the grinding surface using a special tool. When these grooves are formed, the parts of the sanding surface between the grooves which actually sand the wood 20 become so coarse that they have to be ground separately before the sandstone is used for the production of sandstone or for some time initially satisfied with poor quality sandpaper. In any case, as parts of the sanding surface between the grooves gradually wear up to the bottom of the grooves during the sanding process, new very sharp-edged sanding structures "rise" to the sanding surface, removing the wood fibers by unwanted tearing for some time before suitable wear.
FI-patenttijulkaisun 75611 mukaisella hiomakivellä 30 on keraamisiin hiomakiviin nähden se merkittävä etu, että kiven kalliista teroittamisesta päästään eroon, mutta it-seteroituksesta huolimatta hiomapintaan nousevat hiomarakeet ovat samoin aluksi liian terävät.The abrasive stone 30 according to FI patent publication 75611 has the significant advantage over ceramic abrasive stones in that expensive sharpening of the stone can be eliminated, but in spite of IT settling, the abrasive grains rising to the abrasive surface are also too sharp at first.
Teräväreunaisten hiomarakeiden irtirepimät tikut 35 koostuvat nimittäin monista kuiduista, ja ovat näin ollen 2 82491 liian suuria, jolloin syntyy vaikeuksia homogeenisen puumassan ylläpitämisessä. Vasta silloin, kun hiomarae on kulunut niin paljon, että se tavallaan hieroo kuidut irti toisistaan, se osallistuu käyttökelpoisen kuidun muodos-5 tamiseen. Koska hiomapintaan kuitenkin jatkuvasti nousee uusia teräväreunaisia rakeita pinnan kulutuksen myöten, tämä tarkoittaa sitä, että jatkuvasti syntyy jonkin verran tikkujakin. Pulmaa on yritetty lieventää tylsyttämällä hiomarakeita esimerkiksi kalkkihiekkatiilen avulla, joka 10 teroituksen jälkeen on vedetty edestakaisin hiomapinnan yli. Tämä on kuitenkin käytettyyn aikaan ja tulokseen nähden melko hyödytön toimenpide. Rakeet ovat niin kovia, että tehokkaan tylsyttämisen vaativa aika on liian pitkä.Namely, the tear-off sticks 35 of the sharp-edged abrasive grains consist of many fibers, and are thus 2 82491 too large, which makes it difficult to maintain a homogeneous wood pulp. It is only when the abrasive grain has been worn to such an extent that it somehow rubs the fibers apart that it participates in the formation of a usable fiber. However, since new sharp-edged grains are constantly rising on the grinding surface as the surface wears out, this means that some sticks are constantly being formed. Attempts have been made to alleviate the problem by dulling the abrasive grains, for example by means of a sand-lime brick, which, after sharpening, has been drawn back and forth over the abrasive surface. However, this is a rather useless measure in terms of time and result. The granules are so hard that the time required for effective dulling is too long.
Tarkoituksena on nyt saada aikaan uusi hiomakivi, 15 joka poistaa edellä mainitun epäkohdan.The object is now to provide a new grinding stone, 15 which eliminates the above-mentioned drawback.
Keksinnön mukaiselle hiomakivelle on pääasiallisesti tunnusomaista se, että griteissä on ennen matriisiin sitomista pyöristettyjä hiomarakeita. Edullisesti grittien jakautuma matriisissa vastaa n. 50 kHz:n hiomataajuutta. 20 Keksinnön mukaisella hiomakivellä saavutetaan koko hiontaprosessin aikana vallitsevien hiontateorioiden mukainen optimaalinen tilanne, jossa puun kuidut noin 50 kHz:n taajuudella ovat puristuksen ja laajentumisen kevyiden iskujen kohteena, niin että puun ligniini pehmenee * 25 kohonneessa lämpötilassa ja puun kuidut irtoavat vahin goittumatta. Pyöristetyt rakeet ikäänkuin hierovat tai täryttävät kuituja niin, että syntyy ligniiniä pehmentävä lämpö. Kokeilujen mukaan tämä saavutetaan edullisimmin silloin, jolloin grittien etäisyys ja hiomarummun pyöri-30 misnopeus valitaan niin, että grittien iskutaajuus on jokseenkin mainittu 50 kHz. Tänään käytetyillä nopeuksilla grittejä on n. 2 kpl/cm. Hiomarakeen edullinen pyöristys-säde on suuruusluokkaa 0,1 mm, ja sen edullinen raekoko 60-80 mesh eli 0,4-0,27 mm.The abrasive stone according to the invention is mainly characterized in that the grits have rounded abrasive grains before binding to the matrix. Preferably, the distribution of the grits in the matrix corresponds to a grinding frequency of about 50 kHz. The abrasive stone according to the invention achieves the optimal situation according to the abrasive theories prevailing throughout the grinding process, in which the wood fibers at a frequency of about 50 kHz are subjected to light compressions and expansion, so that the wood lignin softens at elevated temperature and the wood fibers are detached. The rounded granules seem to massage or vibrate the fibers so that lignin-softening heat is generated. According to experiments, this is most preferably achieved when the distance of the grits and the rotational speed of the grinding drum are selected so that the stroke frequency of the grits is approximately said 50 kHz. At the speeds used today, there are about 2 grits / cm. The preferred rounding radius of the abrasive grain is on the order of 0.1 mm, and its preferred grain size is 60-80 mesh, or 0.4-0.27 mm.
35 Keksinnön mukaisessa hiomakivessä käytettävä gritti 3 82491 voidaan valmistaa terävänsärmäisistä griteistä. Valitaan sopivansuuruinen ja -laatuinen gritti, jossa terävänsär-mäisiä hiomarakeita on sintrattu yhteen. Ohjaamalla tämänkaltaisia grittejä sopivalla nopeudella plasmallekin tai 5 muun kuuman liekin kautta, voidaan rakeiden terävänsärmäi-set osat sulattaa niin, että ne pyöristyvät. Tällainen menetelmä voidaan soveltaa esim. julkaisun W0 89/05712 mukaan käytettyihin terävänsärmäisiin hiomagritteihin.The Gritti 3 82491 used in the grindstone according to the invention can be made of sharp-edged grits. Gritti of suitable size and quality is selected, in which sharp-edged abrasive grains are sintered together. By directing such grits at a suitable rate even for plasma or through 5 other hot flames, the sharp-edged parts of the granules can be melted so that they are rounded. Such a method can be applied, for example, to the sharp-edged grinding grit used according to WO 89/05712.
Gritit sidotaan edullisesti tiivistettyä betonia 10 olevaan matriisiin. Yhdistelmä on julkaisussa W0 89/05712 kuvatun yhdistelmän näköinen. Tärkeänä ja ratkaisevana erona on nyt kuitenkin se, että hiomarakeet ovat alusta lähtien pyöristetyt, ja että näistä sintraamalla valmistetut hybriidit sijoitetaan betonimatriisiin mainitun 50 15 kHz:n iskutaajuuden aikaansaamiseksi. Keksinnönmukaiset hybriidit ovat n. 5-10 mm pitkiä ja läpimitaltaan paksummasta kohdastaan n. 2-4 mm. Hiomarakeet ovat sidotut toisiinsa hyvin lujasti keraamisen sidonnan ansiosta ja koko gritin sidonta betonimatriisiin on myös hyvin luja, gritin 20 suuremman pinnan ja epätasaisen muodon ansiosta. Betoni-matriisiin ei voi suoraan sijoittaa yksinäisiä pyöristettyjä hiomarakeita, koska ne pienen pintansa takia eivät pysyisi matriisissa kiinni.The grits are preferably bonded to a matrix of compacted concrete 10. The combination looks like the combination described in WO 89/05712. However, an important and crucial difference now is that the abrasive grains are rounded from the start and that hybrids made from these by sintering are placed in a concrete matrix to provide said impact frequency of 50 to 15 kHz. The hybrids according to the invention are about 5-10 mm long and about 2-4 mm thick at their thicker point. The abrasive grains are bonded to each other very tightly due to the ceramic bond, and the bonding of the entire grit to the concrete matrix is also very strong, due to the larger surface and uneven shape of the grit 20. Lone rounded abrasive grains cannot be placed directly in the concrete matrix because they would not stick to the matrix due to their small surface area.
Claims (5)
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FI896334A FI82491C (en) | 1989-12-29 | 1989-12-29 | Grindstone |
AU69089/91A AU6908991A (en) | 1989-12-29 | 1990-12-27 | Grindstone |
PCT/FI1990/000313 WO1991009707A1 (en) | 1989-12-29 | 1990-12-27 | Grindstone |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FI896334A FI82491C (en) | 1989-12-29 | 1989-12-29 | Grindstone |
FI896334 | 1989-12-29 |
Publications (3)
Publication Number | Publication Date |
---|---|
FI896334A0 FI896334A0 (en) | 1989-12-29 |
FI82491B true FI82491B (en) | 1990-11-30 |
FI82491C FI82491C (en) | 1991-03-11 |
Family
ID=8529613
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FI896334A FI82491C (en) | 1989-12-29 | 1989-12-29 | Grindstone |
Country Status (3)
Country | Link |
---|---|
AU (1) | AU6908991A (en) |
FI (1) | FI82491C (en) |
WO (1) | WO1991009707A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1896651B1 (en) * | 2005-06-03 | 2008-12-03 | M-real Oyj | Method and apparatus for mechanical defibration of wood |
US8167962B2 (en) | 2007-04-10 | 2012-05-01 | Saint-Gobain Abrasives, Inc. | Pulpstone for long fiber pulp production |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0390775A1 (en) * | 1987-12-15 | 1990-10-10 | Oy Partek Ab | A grindstone |
-
1989
- 1989-12-29 FI FI896334A patent/FI82491C/en 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/en unknown
Also Published As
Publication number | Publication date |
---|---|
WO1991009707A1 (en) | 1991-07-11 |
AU6908991A (en) | 1991-07-24 |
FI82491C (en) | 1991-03-11 |
FI896334A0 (en) | 1989-12-29 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
MM | Patent lapsed | ||
MM | Patent lapsed |
Owner name: OY PARTEK AB |