EP1573121A1 - Method and device for treating fibrous material - Google Patents
Method and device for treating fibrous materialInfo
- Publication number
- EP1573121A1 EP1573121A1 EP03779867A EP03779867A EP1573121A1 EP 1573121 A1 EP1573121 A1 EP 1573121A1 EP 03779867 A EP03779867 A EP 03779867A EP 03779867 A EP03779867 A EP 03779867A EP 1573121 A1 EP1573121 A1 EP 1573121A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- grinding
- elevations
- depressions
- rotors
- zone
- 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.)
- Withdrawn
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
- D21D1/34—Other mills or refiners
- D21D1/38—Other mills or refiners with horizontal shaft
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2/00—Rotary-piston machines or pumps
- F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
- F04C2/082—Details specially related to intermeshing engagement type machines or pumps
- F04C2/084—Toothed wheels
Definitions
- the invention relates to a method for fiber treatment according to the preamble of claim 1 and a device according to the preamble of claim 7.
- Process for fiber treatment of the above Kinds are generally also referred to as grinding processes. It has long been known that pulp fibers have to be ground so that the paper subsequently produced from them has the desired properties, in particular strength, formation and surface. By far the most frequently used grinding processes use grinding surfaces which are provided with strips known as knives. The corresponding machines are mostly called knife refiners. For special cases, grinding processes are also used in which at least one of the grinding surfaces is knife-free, so that the grinding work is transmitted by friction or shear forces.
- the effect of the method can be controlled over a wide range by changing the grinding parameters, and in addition to the amount of grinding, a distinction is also made in particular as to whether a more cutting or more fibrous grinding is desired. If pulp fibers are processed by the known grinding processes, their resistance to dewatering increases with increasing grinding. A common measure of drainage resistance is the Schopper-Riegler degree of grinding.
- the drum is provided with circumferential grooves or grooves, part of the suspension and the water squeezed out in the gaps (“nips”) are guided past the actual grinding gap in these grooves in order to be mixed again later with the ground, thickened fibrous material. In this way, problems in the operation of such a machine are to be avoided even with a higher throughput.
- the width of the grinding gaps is smaller than the fiber length.
- the invention is based on the object of providing a method for treating pulp with which it is possible to change pulp or paper fibers in such a way that the strengths of the paper produced therefrom are increased.
- the increase in dewatering resistance that occurs should be at least less than in known grinding processes.
- the new grinding process essentially works in such a way that in the grinding zone the elevations of one grinding surface are pressed into the recesses of the other grinding surface, with the fibers to be processed in between. As a result, pressure pulses are transmitted to the fibers.
- the kinematics of the thus shaped and moving grinding surfaces prevent an undesirable, strong shear stress on the fibers, which, as is known, can lead to fibrillation of the outer fiber wall, tearing of fibrils or even shortening of the fibers. This is a decisive difference to grinding with knife refiners or with toothed disk dispersers. Basically, three important advantages are achieved compared to the known grinding processes: 1. - The fiber length is retained much better. 2. - The fiber surface is not or significantly less fibrillated.
- the process delivers particularly good results with native fibers, both with short and long fibers. If it is used on recycled fibers, the advantages mentioned under 1. and 2. may be important. Recycled fibers have already undergone at least one, often even several grinding processes, so that any further size reduction can be avoided.
- Fig. 1 shows a simple example of apparatus for performing the inventive
- FIG. 1 shows the sequence of rotation of two rotors in seven positions over 90 °.
- 3 shows an embodiment with six grinding rotors in a schematic side view
- Figure 4 shows the device of Figure 3 in top view
- Fig. 5 shows a variant of the device shown in Fig. 1 with special
- FIG. 1 shows a variant of the method using two corrugated, engaged rollers
- 7 shows two grinding rotors with a large number of teeth in engagement
- Fig. 8 shows an example, similar to that of Fig. 1, but with a grooved grinding surface.
- the method is explained on the simple device shown in FIG. 1.
- the device is provided with two rotors 1, 2, which are arranged in parallel in a housing 6.
- the drive 7 can act on one or both rotors.
- the surfaces of the rotors 1, 2 touched by the fibrous material F form the grinding surfaces.
- the rotors 1, 2 have the same cross sections over the axial extent.
- the smallest distance 9 between the rotors and the inner wall of the housing is not always as small as possible, since the grinding device has completely different functions than a pump.
- the spacing of the rotors from one another is set by an actuating device 8, which is only indicated. Either the force or the distance can serve as a manipulated variable. As a rule, contact between the two grinding surfaces is prevented.
- the grinding zone 3 is located at the point at which the grinding surfaces of different rotors come closest to one another.
- the fibrous material F which completely or almost completely fills the housing 6, is brought into this grinding zone, the direction of transport of which is mainly in the direction of movement of the elevations 4 lies. It is compressed briefly in the grinding zone and thus contains the pressure pulse required for the desired change in the paper fibers. After passing through the grinding zone 3, the fibrous material is depressurized. It can be assumed that in many cases this grinding process has to be repeated several times, ie that the fibrous material has to be passed through a grinding zone 3 several times.
- the size of the distance 9 influences the recirculated amount. It can be adjustable by appropriate internals. An excessively large distance 9 can favor the passage of unground fiber.
- the relative movement of the grinding surfaces in the grinding zone 3 to one another is slight, but as a rule not zero everywhere. This does involve a certain amount of shear stress on the fibers, but due to the very low shear travel it is not comparable to the processes in a knife refiner or in a pulley disperger.
- the predominant strain on the fibers is the pressure pulse.
- FIG. 2 The known kinematic process, which arises from the rotation of two intermeshing rotors (similar to the Roots blower), is shown schematically in FIG. 2. Starting from the situation shown at the top left, a part (90 °) of the rotation process is shown, in which both rotors have been rotated against each other by 15 ° (angle ⁇ ). The different positions are marked with letters a to g.
- FIG. 3 In which, for example, six rotors which can be moved relative to one another are arranged parallel to one another. This results in a larger number of grinding zones.
- FIG. 4 This device is shown in FIG. 4 in a view from above. Both drawings are to be understood as sketches, since they only show the working principle.
- a seal being made between the housing and the outer contours of the rotors.
- a seal can e.g. by radially movable slide plates 10, which are provided at their front end with sealing rollers 11.
- the sealing rollers 11 roll on the surfaces of the rotors 1 and 2 in such a way that no or only a small leakage current can occur at this point.
- the sealing rollers may be provided with scraper strips 13 in order to seal the gap to the slide plate 10.
- the slide plates 10 can e.g. are pressed against the rotors in the axial direction by means of springs 12. It is also possible to press the slide plates 10 with a relatively large force, so that, with appropriate rotatability of the rotors 1 and 2, the grinding force is generated in the grinding zone 3.
- a device can be used in which the rotors 1 ' , 2 ' are provided with a larger number of elevations 4 ' and depressions 5 ' which are engaged in the grinding zone 3, as is shown in FIG 6 is indicated.
- the shape can be rounded to a relatively large extent or, as shown in FIG. 7, similar to an involute toothing in which, as is known, the relative movement between contacting surfaces is minimal. The selection of these shapes depends on the desired grinding result.
- the elevations 4 ' and depressions 5 ' can - as shown here - run axially parallel. However, they can also have the shape of helical teeth, which makes the grinding process smoother and the running of the grinding device quieter.
- a rotor 2 " has a larger number of grooves 14. These have the advantage of increasing the height and number of pressure pulses. You can also use the local dewatering of the fibrous material in the grinding gap Their depth t is advantageously about 2 to 5 mm and the width u is advantageously greater than 2 mm.
- the grooves 14 can run parallel to the central axis of the rotor 2 " . However, they can also be set at an angle, for example to achieve an axial conveying effect, if desired. It is to be expected that the combination of grooves on a rotor 2 ′′ with a smooth grinding surface on the counter-rotor 1 is particularly favorable for carrying out the method. It is also conceivable to make blind bores on one rotor or both rotors instead of the grooves.
Landscapes
- Paper (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10256856 | 2002-12-05 | ||
DE2002156856 DE10256856A1 (en) | 2002-12-05 | 2002-12-05 | Process and device for fiber treatment |
PCT/EP2003/012485 WO2004050988A1 (en) | 2002-12-05 | 2003-11-08 | Method and device for treating fibrous material |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1573121A1 true EP1573121A1 (en) | 2005-09-14 |
Family
ID=32318971
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP03779867A Withdrawn EP1573121A1 (en) | 2002-12-05 | 2003-11-08 | Method and device for treating fibrous material |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1573121A1 (en) |
AU (1) | AU2003288014A1 (en) |
DE (1) | DE10256856A1 (en) |
WO (1) | WO2004050988A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102007003964A1 (en) * | 2007-01-26 | 2008-01-24 | Voith Patent Gmbh | Wood-pulping equipment for paper- or card manufacture, employs compression refiner to complete fiber hydration and separation without damage |
FR3137398B1 (en) | 2022-06-30 | 2024-05-31 | Centre Technique Du Papier | METHOD FOR PROCESSING CELLULOSIC FIBERS BY MECHANICAL COMPRESSION, PARTICULARLY FOR PAPER PULP |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SE408920B (en) * | 1977-12-06 | 1979-07-16 | Mo Och Domsjoe Ab | DEVICE FOR DEBIBRYING AND CONDITIONING CELLULOSE MATERIAL |
US4685623A (en) * | 1982-09-29 | 1987-08-11 | Clark James D A | Method and apparatus for treating pulp |
SE447738B (en) * | 1983-11-30 | 1986-12-08 | Frotator Ab | DEVICE FOR CELLULO SAMSON TREATMENT WITH A CONSISTENCY ABOUT THE FLATABILITY LIMIT WITH TRANSPORT SCREW FOR A WORKING ZONE |
-
2002
- 2002-12-05 DE DE2002156856 patent/DE10256856A1/en not_active Withdrawn
-
2003
- 2003-11-08 WO PCT/EP2003/012485 patent/WO2004050988A1/en not_active Application Discontinuation
- 2003-11-08 EP EP03779867A patent/EP1573121A1/en not_active Withdrawn
- 2003-11-08 AU AU2003288014A patent/AU2003288014A1/en not_active Abandoned
Non-Patent Citations (1)
Title |
---|
See references of WO2004050988A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE10256856A1 (en) | 2004-06-17 |
WO2004050988A1 (en) | 2004-06-17 |
AU2003288014A1 (en) | 2004-06-23 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
17P | Request for examination filed |
Effective date: 20050705 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PT RO SE SI SK TR |
|
RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: VOITH PATENT GMBH |
|
RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: GOMMEL, AXEL Inventor name: KRAMER, MICHAEL Inventor name: KLEINSCHNITTGER, HERMANN Inventor name: SEPKE, PAUL-WILHELM Inventor name: HESS, HARALD Inventor name: DREYER, AXEL Inventor name: RIENECKER, REIMUND Inventor name: KATZENMAIER, TILLMAN Inventor name: NIGGL, VOLKER |
|
RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: HESS, HARALD Inventor name: GOMMEL, AXEL Inventor name: SEPKE, PAUL-WILHELM Inventor name: DREYER, AXEL Inventor name: KLEINSCHNITTGER, HERMANN Inventor name: KRAMER, MICHAEL Inventor name: KATZENMAIER, TILLMAN Inventor name: RIENECKER, REIMUND Inventor name: NIGGL, VOLKER |
|
17Q | First examination report despatched |
Effective date: 20081229 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
18D | Application deemed to be withdrawn |
Effective date: 20090512 |