EP1573121A1 - Procede et dispositif pour traiter une matiere fibreuse - Google Patents

Procede et dispositif pour traiter une matiere fibreuse

Info

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Withdrawn
Application number
EP03779867A
Other languages
German (de)
English (en)
Inventor
Axel Dreyer
Axel Gommel
Harald Hess
Tillman Katzenmaier
Michael Kramer
Hermann Kleinschnittger
Volker Niggl
Reimund Rienecker
Paul-Wilhelm Sepke
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Voith Patent GmbH
Original Assignee
Voith Patent GmbH
Voith Paper Patent GmbH
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 Voith Patent GmbH, Voith Paper Patent GmbH filed Critical Voith Patent GmbH
Publication of EP1573121A1 publication Critical patent/EP1573121A1/fr
Withdrawn legal-status Critical Current

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

L'invention concerne un procédé et un dispositif destinés au traitement d'une matière fibreuse. Le procédé selon l'invention sert à modifier des fibres à papier ou de pâte à papier en suspension, notamment pour accroître la résistance du papier produit à partir de ces fibres. Selon ce procédé, des surfaces de raffinage présentant des creux (5) et des bosses (4) sont appliquées l'une contre l'autre et déplacées de telle sorte que, dans la zone de raffinage (3), les bosses (4) d'une surface de raffinage viennent en prise dans les creux (5) d'une autre surface de raffinage. Les fibres à papier ou de pâte à papier reçoivent ainsi des impulsions de pression particulièrement avantageuses.
EP03779867A 2002-12-05 2003-11-08 Procede et dispositif pour traiter une matiere fibreuse Withdrawn EP1573121A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10256856 2002-12-05
DE2002156856 DE10256856A1 (de) 2002-12-05 2002-12-05 Verfahren und Vorrichtung zur Faserstoffbehandlung
PCT/EP2003/012485 WO2004050988A1 (fr) 2002-12-05 2003-11-08 Procede et dispositif pour traiter une matiere fibreuse

Publications (1)

Publication Number Publication Date
EP1573121A1 true EP1573121A1 (fr) 2005-09-14

Family

ID=32318971

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03779867A Withdrawn EP1573121A1 (fr) 2002-12-05 2003-11-08 Procede et dispositif pour traiter une matiere fibreuse

Country Status (4)

Country Link
EP (1) EP1573121A1 (fr)
AU (1) AU2003288014A1 (fr)
DE (1) DE10256856A1 (fr)
WO (1) WO2004050988A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007003964A1 (de) * 2007-01-26 2008-01-24 Voith Patent Gmbh Verfahren zur Erzeugung von Holzstoff
FR3137398A1 (fr) * 2022-06-30 2024-01-05 Centre Technique Du Papier Procede de traitement de fibres cellulosiques par compression mecanique notamment pour pate a papier

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE408920B (sv) * 1977-12-06 1979-07-16 Mo Och Domsjoe Ab Anordning for att defibrera och konditionera cellulosamaterial
US4685623A (en) * 1982-09-29 1987-08-11 Clark James D A Method and apparatus for treating pulp
SE447738B (sv) * 1983-11-30 1986-12-08 Frotator Ab Apparat for behandling av cellulosammassa med en konsistens over flytbarhetsgrensen med transportskruv fore en bearbetningszon

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2004050988A1 *

Also Published As

Publication number Publication date
AU2003288014A1 (en) 2004-06-23
WO2004050988A1 (fr) 2004-06-17
DE10256856A1 (de) 2004-06-17

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Inventor name: GOMMEL, AXEL

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