WO2021197805A1 - Vorrichtung zur mahlung einer faserstoffsuspension - Google Patents
Vorrichtung zur mahlung einer faserstoffsuspension Download PDFInfo
- Publication number
- WO2021197805A1 WO2021197805A1 PCT/EP2021/056317 EP2021056317W WO2021197805A1 WO 2021197805 A1 WO2021197805 A1 WO 2021197805A1 EP 2021056317 W EP2021056317 W EP 2021056317W WO 2021197805 A1 WO2021197805 A1 WO 2021197805A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- shaft
- rotor disk
- grinding chamber
- fluid
- bearing
- Prior art date
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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C7/00—Crushing or disintegrating by disc mills
- B02C7/11—Details
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C7/00—Crushing or disintegrating by disc mills
- B02C7/11—Details
- B02C7/14—Adjusting, applying pressure to, or controlling distance between, discs
-
- 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
- D21D1/303—Double disc mills
Definitions
- the invention relates to a refiner for grinding pulps in a pulp suspension
- a refiner for grinding pulps in a pulp suspension comprising a shaft, a rotor disk firmly connected to the shaft and a shaft bearing, the rotor disk being arranged between two stator disks to form a milling space between the rotor disk and the stator disks, the shaft in is movable in an axial direction, at least one stator disk is displaceable in the axial direction, the size of the grinding chamber is adjustable via the distance between the stator disks and the rotor disk is movable between the stator disks by moving the shaft in the axial direction.
- Refiners - or the double disc refiners described - are known in different designs.
- a rotor disk rotates between two stationary stator disks, the rotor disk or the stator disks being equipped with grinding plates.
- the pulp present in suspension is ground in the grinding space between the rotor disk and the stator disks.
- What is essential is a uniform distribution of the grinding pressure in the grinding chamber and thus in the area between the rotor disk and the first stator disk, as well as in the area between the rotor disk and the second stator disk. To do this, the rotor must be able to move axially.
- Various solutions are known in the prior art.
- the aim of the invention is a refiner with reduced wear on the rotor disks and stator disks and in particular the grinding plates on these disks.
- the shaft bearing is hydraulically connected to the grinding chamber.
- "Hydraulically connected” means that a fluid - preferably water - can be transferred between the shaft bearing and the grinding chamber is.
- - in hydraulic terms - continuous flow threads of the fluid between the shaft bearing and the grinding chamber can be represented or given.
- the shaft can move particularly smoothly in the axial direction of the shaft. This smooth mobility is retained in particular during the operation of the refiner.
- the smooth axial mobility of the shaft and thus of the rotor disk firmly connected to the shaft is an essential prerequisite for the pulp present in a suspension in the grinding chamber, i.e.
- the even distribution of the grinding pressure results from the independent and smooth positioning of the rotor disk between the stator disks. Any resistance to positioning, e.g. through friction, promotes the development of an uneven distribution of the grinding pressure and thus directly uneven grinding of the pulp and uneven wear on the rotor disks and stator disks, this wear being particularly related to the grinding plates of the rotor disk and the stator disks .
- the fixed connection of the rotor disk to the shaft is to be understood as meaning that there is no axial displaceability between the shaft and the rotor disk and thus no relative movement in the axial direction between the shaft and the rotor disk.
- the connection between the rotor disk and the shaft can of course be made detachable, which can be important for service and installation.
- a favorable embodiment of the refiner is characterized in that the rotor disk is firmly connected to the shaft inside or outside the shaft bearing. The shaft is thus supported on both sides of the rotor disk or overhung.
- a mounting of the shaft of a refiner on both sides of the rotor disk allows an even and distributed bearing load, but not a very compact design, since the shaft bearing is designed on both sides of the rotor disk.
- the rotor disk is firmly connected to the shaft at a first end of the shaft and the rotor disk is outside the shaft bearing. At a second end of the shaft, the shaft is connected to a motor via a coupling, the coupling being outside the shaft bearing.
- the cantilevered mounting of the rotor disk together with the hydraulically connected shaft mounting according to the invention a very compact design.
- An advantageous embodiment of the refiner is characterized in that the shaft is mounted exclusively via fluid-lubricated slide bearings. This allows the shaft to move particularly smoothly in the axial direction of the shaft.
- the shaft is mounted on both sides of the rotor disk, only fluid-lubricated plain bearings are arranged on both sides of the rotor disk.
- the rotor disk is firmly connected to the shaft at a first end of the shaft and the shaft is supported exclusively by fluid-lubricated plain bearings, the shaft bearing being arranged between the rotor disk and a second end of the shaft.
- the shaft bearing is designed as a fluid-lubricated sliding bearing, with a fluid, preferably water, being able to be fed to the grinding chamber via the shaft bearing.
- a fluid preferably water
- the design as a water-lubricated slide bearing is particularly advantageous.
- water can be supplied to the grinding chamber via the water-lubricated sliding bearing.
- the use of water as the fluid means the possibility of realizing an oil-free shaft bearing, so that contamination of the fiber suspension by an oil or hydraulic oil is excluded. It is particularly advantageous to provide a forced guidance to ensure a direction of flow of the fluid - preferably water - through the fluid-lubricated sliding bearing into the grinding chamber.
- Such a forced guidance can easily be achieved in that the fluid in the shaft bearing has a higher pressure than the pulp suspension in the grinding chamber in the area where the fluid is fed into the grinding chamber. Due to the higher pressure of the fluid in the shaft bearing, the fluid flows in the direction of the grinding chamber, which advantageously effectively prevents contamination of the shaft bearing or the water-lubricated plain bearing. In this way, the water-lubricated plain bearing is always flushed in the direction of the grinding chamber and the smooth movement of the shaft is maintained over the operating time.
- the shaft mounting on both sides of the rotor disk is designed as a fluid-lubricated sliding bearing, with a fluid, preferably water, being able to be fed to the grinding chamber via the shaft bearing.
- a seal is arranged between the grinding chamber and the shaft bearing.
- the shaft bearing is designed as a fluid-lubricated sliding bearing, with a fluid, preferably water, being able to be supplied to the grinding chamber through the shaft bearing via the seal.
- An advantageous embodiment of the seal comprises a shaft sealing ring or a throttle ring.
- the seal is arranged, for example, between the shaft and the bearing housing, inserted into a recess in the bearing housing and fixed in the bearing housing via a fixing ring.
- the shaft is guided through the seal, with the seal being in contact with the shaft in the case of a shaft sealing ring or a gap between the shaft and the sealing ring in the case of a throttle ring.
- Seals advantageously have at least one sealing lip.
- seals have a sealing effect that is dependent on the direction of flow of the fluid.
- seals include shaft seals or throttle rings.
- the sealing effect, which is dependent on the direction of flow can be implemented by the fluid or the fluid pressure lifting the seal from the sealing surface and / or the seal releasing a larger flow cross-section for the fluid when, for example, there is a flow direction of the fluid from the shaft bearing to the grinding chamber.
- the seal is advantageously designed with a sealing lip, the sealing lip being designed in the shape of a truncated cone in order to develop a sealing effect as a function of the direction of flow.
- a seal with a frustoconical sealing lip can be arranged in such a way that the shaft is guided inside the seal, the axial direction of the shaft and the axis of the frustoconical sealing lip coinciding.
- the seal is clamped in the bearing housing and the frustoconical sealing lip is guided against the shaft.
- a flow of the fluid from the base to the imaginary cone tip of the frustoconical sealing lip leads to a widening of the sealing lip, to a lifting of the seal from the shaft or at least to one Reduction of the contact pressure of the seal against the sliding surface or shaft, which is decisive for the seal and the sliding friction.
- a flow of the fluid from the imaginary cone tip to the base of the frustoconical sealing lip the fluid would press the sealing lip against the shaft and lead to an increase in the contact pressure of the sealing lip.
- the seal is for example clamped on the shaft and the frustoconical sealing lip is oriented towards the bearing housing.
- a flow of the fluid from the base to the imaginary cone tip of the frustoconical sealing lip leads to a widening of the base surface and thus to an increased pressure of the sealing lip and to an improved sealing effect against the bearing housing.
- Seals that have a sealing effect that is dependent on the direction of flow of the fluid are advantageous, since when the fluid flows in accordance with the desired direction of flow, very little or no friction losses in the seal can be achieved. If the direction of flow is reversed, however, the best possible seal can be achieved, and a flow of the fluid against the desired direction of flow can be reduced or avoided.
- An equally advantageous embodiment of the refiner is characterized in that when the fluid flows through the shaft bearing into the grinding chamber, the seal has a sealing effect which is less than when the fluid flows out of the grinding chamber into the shaft bearing.
- Seals that have a sealing effect that depends on the direction of flow of the fluid are advantageous because they allow very little or no friction losses in the seal when the fluid flows in the desired direction of flow from the shaft bearing into the grinding chamber. If the direction of flow is reversed, this behavior is advantageously reversed, since the best possible seal is required when the fluid flows from the grinding chamber into the shaft bearing, in particular to prevent the pulp suspension from flowing from the grinding chamber into the shaft bearing and corresponding contamination of the shaft bearing by the fiber materials to avoid.
- a damping element is assigned to the shaft bearing, the damping element being preferably between the rotor disk and a motor is arranged between the rotor disk and a clutch, wherein the clutch is arranged between the rotor disk and the motor.
- the mounting according to the invention allows the shaft to move freely in the axial direction so that, surprisingly, jerky movements of the shaft can occur during operation, which should be avoided.
- the coupling can provide a low level of damping, for example due to friction effects in the coupling.
- this is not sufficient, which is why the arrangement of a damping element is advantageous in order to ensure uniform movements of the shaft in the axial direction.
- the damping element is hydraulically connected to the shaft bearing.
- the damping element comprises, for example, a damping area and a throttle element.
- the throttle element can, for example, be designed as a throttle ring, the throttle ring being arranged between the shaft and the bearing housing and covering a predominant part of the gap between the shaft and the bearing housing.
- the damping area is formed, for example, by an area between the shaft, the bearing housing and the throttle element, the damping area being arranged between the shaft bearing and the clutch.
- the damping element is hydraulically connected to the shaft bearing, i.e. the fluid - preferably water - that can be fed to the shaft bearing is also fed to the damping element, with continuous streams of fluid between the shaft bearing, i.e.
- the fluid supply to the shaft bearing and the damping element When the shaft moves in the axial direction, the volume of the damping area changes, with an increase in the volume fluid flowing into the damping area via the throttle element and a reduction in the volume, fluid flowing out of the damping area via the throttle element.
- a damping effect results in accordance with the viscous losses of the fluid when passing the throttle element.
- An equally advantageous embodiment of the refiner is characterized in that the pulp suspension can be fed to the grinding chamber via an inlet area or through the shaft.
- This advantageous bearing allows shaft diameters to be implemented which allow the pulp suspension to be fed through the shaft to the grinding chamber and, unlike when using conventional roller bearings, larger shaft diameters can also be implemented in a technically sensible manner.
- the rotor disk is designed with openings, the openings providing a uniform distribution of the pulp suspension in the grinding chamber that can be fed in via the inlet area or via the shaft.
- the fiber suspension is advantageously fed to the refiner on one side of the rotor disk, the fiber suspension being able to be guided directly into a first gap between a first stator disk and the rotor disk.
- the fiber suspension can also be fed to the second side of the rotor disk through the openings in the rotor disk, the fiber suspension being able to be guided into a second gap between a second stator disk and the rotor disk.
- An advantageous embodiment of the refiner is characterized in that the shaft is connected to a motor via a coupling, the movement of the shaft in the axial direction being able to be picked up by the coupling. Since the motor is arranged immovably and the shaft is advantageously movable in the axial direction, a relative movement in the axial direction between the shaft and the motor can be absorbed via the coupling.
- a particularly advantageous embodiment of the refiner is characterized in that the coupling is designed as a curved tooth coupling and the shaft can be moved radially and / or axially in the curved tooth coupling.
- the shaft is designed with external teeth in the area of the coupling and is connected to the motor via an intermediate coupling piece that has internal teeth. In the event of maintenance, dismantling the intermediate piece provides very good accessibility to the refiner.
- Curved tooth couplings allow movement of the shaft in the axial direction as well as movement in the radial direction.
- Curved tooth clutches also allow the external toothing of the shaft and the internal toothing of the intermediate coupling piece to perform a tumbling movement when the shaft rotates, with permanent sliding friction between the toothing.
- Fig. 2 shows a refiner according to the invention.
- Fig. 3 shows details of the shaft bearing according to the invention.
- a rotor disk 2 is arranged on a shaft 1 in a housing 19, the rotor disk 2 being movable relative to the shaft 1 in the axial direction 7.
- the fiber suspension is fed to the refiner 17 via an inlet area 12 and is distributed through openings 13 (not shown) in the rotor disk 2 in the grinding chamber 6.
- the fiber suspension is in a first grinding gap between the rotor disk 2 and the first stator disk 4 and in a second grinding gap ground between the rotor disk 2 and the second stator disk 5 and leaves the refiner 17 via the outlet region 18.
- Interchangeable grinding plates are arranged on the rotor disk 2 or the stator disks 4, 5.
- the second stator disk 5 can be moved in the axial direction 7 via an adjusting device 20 and the distance between the stator disks 4, 5 or between the rotor disk 2 and the stator disks 4, 5 can be adjusted.
- the axial mobility of the rotor disk 2 on the shaft 1 allows the rotor disk 2 to be centered independently between the stator disks 4, 5, with comparable grinding gaps being established.
- This embodiment of the refiner 17 provides no mobility of the shaft 1 in the axial direction 7, the shaft bearing 3 as Rolling bearing is executed. Shaft bearing 3 and grinding chamber 6 are clearly separated.
- the roller bearings are oil-lubricated.
- a seal 8 seals the grinding chamber 6 or the inlet area 12 against the shaft 1. The introduction of oil into the grinding chamber 6 is to be prevented structurally;
- Fig. 2 shows a refiner according to the invention with a cantilever bearing.
- a rotor disk 2 is arranged on a shaft 1 in a housing 19, the rotor disk 2 being firmly connected to the shaft 1 and the shaft 1 being movable in the axial direction 7.
- the fiber suspension is fed to the refiner 17 via an inlet area 12 and is distributed through openings 13 (not shown) of the rotor disk 2 in the grinding chamber 6.
- the fiber suspension is in a first grinding gap between the rotor disk 2 and the first stator disk 4 and in a second grinding gap ground between the rotor disk 2 and the second stator disk 5 and leaves the refiner 17 via the outlet region 18.
- Interchangeable grinding plates are arranged on the rotor disk 2 or the stator disks 4, 5.
- the second stator disk 5 can be moved in the axial direction 7 via an adjusting device 20 and the distance between the stator disks 4, 5 or between the rotor disk 2 and the stator disks 4, 5 can be adjusted.
- the shaft 1 is connected to a motor 10 (not shown) via a coupling 11, the coupling 11 being able to absorb the movement of the shaft 1 in the axial direction 7.
- the shaft 1 is cantilevered via a shaft bearing 3, the rotor disk 2 being arranged outside the shaft bearing 3.
- the shaft bearing 3 is hydraulically connected to the grinding chamber 6.
- the shaft bearing 3 is designed as a fluid-lubricated sliding bearing 23, a fluid - preferably water - serving as a lubricating medium in the shaft bearing 3 and being at least partially feedable to the grinding chamber 6 via the shaft bearing 3.
- the seal 8 arranged between the shaft bearing 3 and the grinding chamber 6 limits the amount of fluid that flows between the shaft bearing 3 and the grinding chamber 6 in accordance with the pressure conditions.
- the fluid is advantageously guided in a targeted manner out of the shaft bearing 3 in the direction of the grinding chamber 6. This works through a higher pressure of the fluid in the shaft bearing 3 compared to the pressure in the grinding chamber 6. This ensures that no pulp suspension or no pulp from the grinding chamber 6 is introduced into the shaft bearing 3. It is also possible to implement a seal 8 with a sealing effect that is dependent on the direction of flow of the fluid.
- the refiner 17 advantageously also comprises a damping element 9 which is assigned to the shaft bearing 3.
- the damping element 9 is arranged between rotor disk 2 and motor 10 (not shown) and preferably between rotor disk 2 and clutch 11.
- the damping element 9 can be hydraulically connected to the shaft bearing 3, the damping element 9 comprising a damping area 15 and a throttle element 16. The fluid supplied to the shaft bearing 3 flows through the shaft bearing 3 and also fills the damping area 15.
- the volume of the damping area 15 can be changed, with fluid flowing to the damping element 9 when the volume of the damping area 15 increases, and when the volume is increased Volume reduction of the damping area 15 from the damping element 9 fluid flows out, wherein the fluid flows in or out of the damping area 15 via the throttle element 16.
- the fluid is fed to the shaft bearing 3 via a fluid inlet 21 and flows through the fluid-lubricated sliding bearing 23 or fills the damping area 15.
- the seal 8 is arranged between the shaft bearing 3 and the grinding chamber 6 and limits the amount of fluid that flows between the shaft bearing 3 and grinding chamber 6 in accordance with the pressure conditions, the majority of the fluid being discharged from the shaft bearing 3 via the fluid return 22.
- the fluid is advantageously guided in a targeted manner in the direction of the grinding chamber 6 by a greater pressure of the fluid in the shaft bearing 3 compared to the pressure in the grinding chamber 6.
- the damping element 9 is hydraulically connected to the shaft bearing 3, and comprises the damping area 15 and the throttle element 16.
- the throttle element 16 is connected to the shaft 1 in FIG.
- the damping area 15 being delimited by the shaft 1, the bearing housing 14 and the throttle element 16.
- the volume of the damping area 15 can be changed, with fluid flowing to the damping element 9 when the volume of the damping area 15 increases and fluid flows out of the damping element 9 when the volume of the damping area 15 is reduced, the fluid flowing out via the throttle element 16 flows into or out of the damping area 15.
- FIGS. 4a and 4b each show an advantageous seal 8 of the shaft bearing 3, which allows a sealing effect that is dependent on the direction of flow of the fluid.
- the seal 8 is fixed in the bearing housing 14 via a fastening element 24, with sealing lips 25 being guided against the shaft 1.
- a flow of the fluid from the base to the imaginary The conical tip of the frustoconical sealing lip 25 - and thus from the shaft bearing 3 in the direction of the grinding chamber 6 - leads to a widening of the sealing lip 25, to a lifting of the sealing lip 25 from the shaft 1 or at least to a reduction of that which is decisive for the seal 8 and the sliding friction Contact pressure of the seal 8 against the shaft 1.
- the direction of flow is reversed, ie a flow of the fluid from the imaginary cone tip to the base of the frustoconical sealing lip 25 - or from the grinding chamber 6 in the direction of the shaft bearing 3 - the fluid presses the sealing lip 25 against the Shaft 1 and leads to an increase in the contact pressure of the sealing lip 25 on the W Elle 1.
- a seal 8 with two free-standing sealing lips 25 is shown.
- 4b shows a seal 8 with two sealing lips 25, a free-standing sealing lip 25 being arranged closer to the shaft bearing 3 and the sealing lip 25, which is arranged closer to the grinding chamber 6, dispensing with a cavity 26 oriented towards the grinding chamber 6, whereby an embedding of fibrous material and possible hardening of fibrous material in the cavity 26 oriented towards the grinding chamber 6 is advantageously avoided.
- the present invention thus offers numerous advantages.
- the low wear of the rotor disks and stator disks - and in particular of the grinding plates on these disks, is particularly advantageous, which is achieved by the very smooth positioning of the rotor disk, which is also maintained during continuous operation.
- the solution according to the invention makes it possible to avoid contamination by fibrous material in the sealing area and storage area.
- the storage according to the invention also avoids the risk of oil contamination of the fiber suspension, since the storage can be operated oil-free and the risk of contamination of the storage by the fiber is eliminated or is minimal.
- the storage according to the invention also allows a more compact design of the refiner and, above all, a shorter overall length.
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- Food Science & Technology (AREA)
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Abstract
Description
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Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN202180001142.8A CN113164967B (zh) | 2020-04-01 | 2021-03-12 | 用于研磨纤维材料悬浮液的设备 |
BR112022013920A BR112022013920A2 (pt) | 2020-04-01 | 2021-03-12 | Dispositivo para refino de uma suspensão de polpa de fibra |
EP21712970.9A EP4127310B1 (de) | 2020-04-01 | 2021-03-12 | Vorrichtung zur mahlung einer faserstoffsuspension |
US17/798,133 US20230047528A1 (en) | 2020-04-01 | 2021-03-12 | Apparatus for Grinding a Fibrous Material Suspension |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ATA50275/2020A AT523590B1 (de) | 2020-04-01 | 2020-04-01 | Vorrichtung zur mahlung einer faserstoffsuspension |
ATA50275/2020 | 2020-04-01 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2021197805A1 true WO2021197805A1 (de) | 2021-10-07 |
Family
ID=75108308
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2021/056317 WO2021197805A1 (de) | 2020-04-01 | 2021-03-12 | Vorrichtung zur mahlung einer faserstoffsuspension |
Country Status (2)
Country | Link |
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AT (1) | AT523590B1 (de) |
WO (1) | WO2021197805A1 (de) |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB745987A (en) * | 1954-02-17 | 1956-03-07 | E D Jones & Sons Company | A refining apparatus, attrition mill or the like |
CH410612A (de) * | 1962-01-15 | 1966-03-31 | Sprout Waldron & Co Inc | Schleifmühle |
AT267306B (de) * | 1962-08-08 | 1968-12-27 | Keith Victor Thomas | Zellulose-Zerfaserungsvorrichtung |
US4700900A (en) * | 1983-10-24 | 1987-10-20 | Hymac Ltd. | Two stage refiner |
DE202006002999U1 (de) | 2006-02-24 | 2007-06-28 | Voith Paper Patent Gmbh | Scheibenrefiner zum Mahlen von Faserstoffmaterial |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3028632A (en) * | 1957-11-18 | 1962-04-10 | Curlator Corp | Machine for treating wood pulp and the like |
CN2135591Y (zh) * | 1992-09-29 | 1993-06-09 | 德阳市八角造纸厂 | 一种新型高效草浆机 |
-
2020
- 2020-04-01 AT ATA50275/2020A patent/AT523590B1/de active
-
2021
- 2021-03-12 WO PCT/EP2021/056317 patent/WO2021197805A1/de active Application Filing
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB745987A (en) * | 1954-02-17 | 1956-03-07 | E D Jones & Sons Company | A refining apparatus, attrition mill or the like |
CH410612A (de) * | 1962-01-15 | 1966-03-31 | Sprout Waldron & Co Inc | Schleifmühle |
AT267306B (de) * | 1962-08-08 | 1968-12-27 | Keith Victor Thomas | Zellulose-Zerfaserungsvorrichtung |
US4700900A (en) * | 1983-10-24 | 1987-10-20 | Hymac Ltd. | Two stage refiner |
DE202006002999U1 (de) | 2006-02-24 | 2007-06-28 | Voith Paper Patent Gmbh | Scheibenrefiner zum Mahlen von Faserstoffmaterial |
Also Published As
Publication number | Publication date |
---|---|
AT523590B1 (de) | 2022-01-15 |
AT523590A1 (de) | 2021-09-15 |
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