EP2367975A1 - Vorrichtung für die zerkleinerung eines zellulosehältigen aufgabegutes - Google Patents
Vorrichtung für die zerkleinerung eines zellulosehältigen aufgabegutesInfo
- Publication number
- EP2367975A1 EP2367975A1 EP09807591A EP09807591A EP2367975A1 EP 2367975 A1 EP2367975 A1 EP 2367975A1 EP 09807591 A EP09807591 A EP 09807591A EP 09807591 A EP09807591 A EP 09807591A EP 2367975 A1 EP2367975 A1 EP 2367975A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- grinding
- layer
- carrier layer
- cover layer
- discs
- Prior art date
- Legal status (The legal status 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 status listed.)
- Granted
Links
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
- D21D1/00—Methods of beating or refining; Beaters of the Hollander type
- D21D1/20—Methods of refining
- D21D1/30—Disc mills
- D21D1/306—Discs
Definitions
- the invention relates to a device for the comminution of a cellulose-containing feed material in the wood processing, in particular in the pulp, paper and wood board production, using relatively small spaced rotating grinding discs, and a screw conveyor for the transport of the feed material to the grinding discs, according to the Preamble of claim 1.
- the feedstock can be present in various forms, such as wood chips, veneer residues, sawdust, • fibers and the like.
- Roundwood is first processed into wood chips, which can be subsequently fed as a feedstock for further crushing a generic device.
- the generic device serves to produce wood fibers which are further processed into pulp, paper or wood fiber boards, such as "MDF boards” (medium-density wood fiber boards), for example pulp which is the chemical pulping of plant fibers, mostly wood fibers
- MDF boards medium-density wood fiber boards
- the generic devices are also known as "shredders"("refiner”).
- shredders In these devices, two grooved grinding discs rotate at a slight distance relative to each other, distinguishing between single-disc refiners with only one rotating disc, and double-disc refiners in which both discs rotate.
- the feed material is thrown by a screw conveyor between the two grinding discs, where it is ground up.
- the shredded feed material is subsequently blown out of the refiner through a blow pipe.
- the steam forms the means of transport for the wood fibers, for example on their way through the blowpipe into a subsequent dryer.
- the grinding discs carry facing grinding plates
- the refining plates may be flat, conical, cylindrical, or even a combination of these different geometries.
- the grinding discs are usually made of steel, as act on the two grinding discs large mechanical loads.
- the rotating grinding disk for the grinding process must transmit high axial forces from the shaft of the grinding disk to the grinding plate, and on the other hand, it must also transmit high torques from the shaft to the grinding plate.
- the gap between the two grinding plates should namely be kept sufficiently constant to ensure a perfect grinding process.
- the forces acting on the grinding discs cause deformation of the grinding discs, thus affecting the grinding process. In known refiners according to the state of the art, there are thus again and again impairments of the grinding quality due to deformations of the grinding disks.
- the object of the invention to avoid the disadvantages of known devices for the comminution of a cellulosic feedstock.
- a perfect grinding quality should be ensured despite the high mechanical loads.
- known devices are to be optimized so that higher rotational speeds, and thus higher material throughput, are made possible.
- Claim 1 refers to a device for the comminution of a cellulose-containing feed material in the wood processing, in particular in the pulp, paper and wood board production, by means of relatively small spaced rotating grinding discs.
- the relative rotation of the grinding discs can be given by rotation of a Mahlusion against a stationary grinding disc, or both grinding discs.
- at least one of the grinding disks has a layer structure in the axial direction with at least one cover layer and at least one carrier layer, wherein the at least one cover layer has a higher modulus of elasticity and a higher density than the at least one carrier layer. Due to the layered structure, a targeted optimization with regard to the loading situation of the grinding disks can take place.
- the at least one cover layer has a high modulus of elasticity, that is to say a high flexural rigidity for a given area moment of inertia of the geometrically given cross section, so that the high axial loads and the high torques can be absorbed.
- the bending stiffness can be optimized so that hardly deformations of the grinding discs occur, so that a uniform grinding quality can be ensured.
- the carrier of the grinding disc is made of a material of lower density, which reduces the total weight of the grinding disc accordingly. As a result, higher rotational speeds can be achieved, which not only reduces the load on the shaft bearings, but also allows a higher material throughput.
- the shaft bearing can therefore be constructed simpler, which reduces the cost. Furthermore, the structure proposed according to the invention also proves more cost-effective than conventional grinding disks, since cheaper materials can be used. In addition, since the centrifugal forces are reduced due to the lower total weight, there is a reduced risk potential if the grinding disk breaks.
- the at least one carrier layer has a greater total thickness than the at least one cover layer in order to take account of the lower density of the carrier layer.
- the carrier layer transmits primarily shear forces, and serves as a carrier for the at least one cover layer.
- the at least one cover layer is made of glass-fiber-reinforced or carbon fiber-reinforced laminates.
- the at least one carrier layer may be made of a foamed or honeycomb material, for example.
- Fig. 2a shows a cross section through one half of a first
- Embodiment of a grinding disk according to the invention with layer structure and the FIGS. 3a-3f show the course of the bending and tensile stresses in grinding disks of conventional construction and with the construction according to the invention.
- FIG. 1 schematically shows a representation of a shredder (refiner) with a rotating grinding disc 1 and a stator 2.
- Both grinding disk 1 and stator 2 each carry grinding plates 4, which are generally circular in shape with up to 20 segments and are slightly spaced apart in the axial direction, usually about 0.3 to 0.7 mm.
- the rotating grinding disc 1 is arranged on a shaft 3.
- a housing 5 In the axial direction of the grinding disc 1, a housing 5 is further arranged within which a screw conveyor 8 is rotatably mounted. In the region of the axial extent of the screw conveyor 8, there is also the feed 6 for the feed material. Supplied feed material is thus transported by the screw conveyor 8 in the direction of the rotating grinding disk 1, where it passes between the two grinding plates 4.
- the ground feed leaves the shredder on the housing 5 opposite side of the grinding disc 1, ie with reference to FIG. 1 on the right side of the device.
- This steam is on the one hand used as a transport for the wood fibers, such as on their way through the blowpipe in a subsequent dryer or cyclone, but part of the steam is also removed by the screw conveyor 8 via the steam outlet 7 from the shredder.
- FIG. 2 a shows an embodiment in which an inner support layer 11 is encased with an outer cover layer 10.
- 2b shows an embodiment in which a carrier layer 11 is "sandwiched" between two outer cover layers 10.
- the at least one cover layer 10 Due to the higher modulus of elasticity, as well as the higher density, the at least one cover layer 10 thus has a high flexural rigidity, so that the high axial loads and the high torques can be accommodated.
- the carrier layer 11 of the grinding disc 1 is made of a material of lower density, which reduces the total weight of the grinding disc 1 accordingly. As a result, higher rotational speeds can be achieved, which not only reduces the load on the shaft bearings, but also allows a higher material throughput.
- the at least one cover layer 10 may be made of, for example, glass fiber reinforced or carbon fiber reinforced laminates, or manufactured using a so-called "prepreg,” which is a prefabricated combination of resin and fibers between resin and fiber volumes, so that ultimately more even material values can be achieved
- Resin systems can include epoxy resins, cyanester resins, bismaleimides
- the at least one carrier layer may be made of a foamed or honeycomb material.
- composites of this type have a high flexural strength and tensile strength, but on the other hand also a low weight, and are also cheaper to produce than the currently used grinding discs made of steel.
- the bending stiffness is caused primarily by the cover layer 10 with a high modulus of elasticity, as can be seen from FIG. 3b.
- 3 b shows the bending stress curve along a cross section of a grinding disk 1 according to the invention, as shown schematically in the embodiments of FIG. 2, and is to be compared with the bending stress profile in a conventional grinding disk made of steel according to FIG. 3 a.
- Bending stresses are the stresses acting in the axial direction of the grinding disc 1. While the entire cross section of a grinding disc made of steel absorbs bending stresses, this is the case in a grinding disk 1 according to the invention only in the cover layer 10.
- FIG. 3c the tensile stress profile due to radial centrifugal loading in a conventional grinding disk made of steel is compared with the tensile stress profile along a cross section of a grinding disk 1 according to the invention according to FIG. 3d.
- the tensile stresses in a grinding disk 1 according to the invention are lower due to the lower weight than in conventional grinding disks made of steel.
- larger tensile stresses are absorbed in the cover layer 10 than in the inner carrier layer 11.
- FIGS. 3e and 3f show mixed load situations for conventional steel grinding disks (FIG. 3e) and FIG a grinding disk 1 according to the invention (FIG. 3f).
Landscapes
- Paper (AREA)
- Crushing And Pulverization Processes (AREA)
- Laminated Bodies (AREA)
- Debarking, Splitting, And Disintegration Of Timber (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT20122008A AT507724B1 (de) | 2008-12-23 | 2008-12-23 | Vorrichtung für die zerkleinerung eines zellulosehältigen aufgabegutes |
PCT/AT2009/000493 WO2010071911A1 (de) | 2008-12-23 | 2009-12-21 | Vorrichtung für die zerkleinerung eines zellulosehältigen aufgabegutes |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2367975A1 true EP2367975A1 (de) | 2011-09-28 |
EP2367975B1 EP2367975B1 (de) | 2012-11-21 |
Family
ID=42111062
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP09807591A Not-in-force EP2367975B1 (de) | 2008-12-23 | 2009-12-21 | Vorrichtung für die zerkleinerung eines zellulosehältigen aufgabegutes |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP2367975B1 (de) |
CN (1) | CN102264980A (de) |
AT (1) | AT507724B1 (de) |
BR (1) | BRPI0923685A2 (de) |
CL (1) | CL2011001541A1 (de) |
RU (1) | RU2011129071A (de) |
WO (1) | WO2010071911A1 (de) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102021132158A1 (de) | 2021-12-07 | 2023-06-07 | Aikawa Fiber Technologies Inc. | Refiner-Füllstück mit Mehrfachbeschichtungen auf Stäben |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3327952A (en) * | 1964-08-01 | 1967-06-27 | West Virginia Pulp & Paper Co | Method for the preparation of fibrous materials for the production of paper and cardboard |
CN85103088A (zh) * | 1985-04-23 | 1986-10-22 | 美商贝洛特公司 | 复合之挠性纸浆精制器圆盘及其制法 |
US5042726A (en) * | 1989-11-13 | 1991-08-27 | Sunds Defibrator Ab | Apparatus and method for conjoint adjustment of both the inner and outer grinding spaces of a pulp defibrating apparatus |
FR2667804B1 (fr) | 1990-10-11 | 1995-02-10 | Technogenia Sa | Plaque a surface antiabrasion, et procede pour sa realisation. |
FR2707677B1 (fr) * | 1993-07-13 | 1995-08-25 | Technogenia | Plaque de défibrage ou de raffinage de pâte à papier, et procédé pour sa réalisation. |
DE19712653C2 (de) * | 1997-03-26 | 2002-10-24 | Voith Paper Fiber Systems Gmbh | Verfahren und Vorrichtung zur Dispergierung eines Altpapierfaserstoffes |
DE19955009C2 (de) * | 1999-11-16 | 2001-10-18 | Voith Paper Patent Gmbh | Verfahren zur Herstellung von Garnituren für das mechanische Bearbeiten von suspendiertem Faserstoffmaterial |
DE202004003743U1 (de) * | 2004-03-10 | 2004-05-19 | Voith Paper Patent Gmbh | Mahlmaschine sowie Mahlgarnitur für Papierfaserstoff |
CN2719396Y (zh) * | 2004-07-09 | 2005-08-24 | 田光发 | 高速剪切工业胶体磨机 |
EP1812164A2 (de) * | 2004-10-21 | 2007-08-01 | Welldone Weartec N.V. | Mahlelement, sowie mahlkörper mühlen, mischer, extruder und pressschnecken mit solchen mahlelementen |
-
2008
- 2008-12-23 AT AT20122008A patent/AT507724B1/de not_active IP Right Cessation
-
2009
- 2009-12-21 WO PCT/AT2009/000493 patent/WO2010071911A1/de active Application Filing
- 2009-12-21 BR BRPI0923685A patent/BRPI0923685A2/pt not_active IP Right Cessation
- 2009-12-21 RU RU2011129071/12A patent/RU2011129071A/ru not_active Application Discontinuation
- 2009-12-21 EP EP09807591A patent/EP2367975B1/de not_active Not-in-force
- 2009-12-21 CN CN2009801524514A patent/CN102264980A/zh active Pending
-
2011
- 2011-06-21 CL CL2011001541A patent/CL2011001541A1/es unknown
Non-Patent Citations (1)
Title |
---|
See references of WO2010071911A1 * |
Also Published As
Publication number | Publication date |
---|---|
CN102264980A (zh) | 2011-11-30 |
CL2011001541A1 (es) | 2011-10-14 |
WO2010071911A1 (de) | 2010-07-01 |
AT507724A2 (de) | 2010-07-15 |
EP2367975B1 (de) | 2012-11-21 |
AT507724B1 (de) | 2011-03-15 |
RU2011129071A (ru) | 2013-01-27 |
BRPI0923685A2 (pt) | 2016-01-19 |
AT507724A3 (de) | 2011-01-15 |
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