WO2011098147A1 - Procédé pour broyer des fibres cellulosiques en suspension aqueuse et unité de broyage pour sa mise en oeuvre - Google Patents

Procédé pour broyer des fibres cellulosiques en suspension aqueuse et unité de broyage pour sa mise en oeuvre Download PDF

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Publication number
WO2011098147A1
WO2011098147A1 PCT/EP2010/051852 EP2010051852W WO2011098147A1 WO 2011098147 A1 WO2011098147 A1 WO 2011098147A1 EP 2010051852 W EP2010051852 W EP 2010051852W WO 2011098147 A1 WO2011098147 A1 WO 2011098147A1
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WO
WIPO (PCT)
Prior art keywords
grinding
grooves
mahlgarnituren
outside
radial direction
Prior art date
Application number
PCT/EP2010/051852
Other languages
German (de)
English (en)
Inventor
Markus FÜRSATTEL
Paul-Wilhelm Sepke
Herrmann Post
Michael Kramer
Original Assignee
Voith 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 filed Critical Voith Patent Gmbh
Priority to PCT/EP2010/051852 priority Critical patent/WO2011098147A1/fr
Publication of WO2011098147A1 publication Critical patent/WO2011098147A1/fr

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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 method according to the preamble of claim 1. It has long been known that pulp fibers, i. H. Frischzellstoff- or waste paper fibers, are ground so that the paper produced later from the desired properties, in particular strength, formation and surface, has. Grinding methods of the type considered here use grinding tools which are provided with strips designated as knives. The corresponding machines are usually called Mahlrefiner. The grinding tools are usually referred to as trimmings.
  • Refiner sets for grinding pulp fibers with grinding bars and grooves in between are e.g. known from DE 20 2005 007 551 U1.
  • the invention is based on the object to provide a process for pulp grinding, with which it is possible to carry out the grinding economically and particularly evenly, i. that the desired Mahltechnchten changes in all fibers are as equal as possible.
  • Claims 14 and 15 each describe particularly suitable grinding sets for the method. With the aid of these measures described, it is possible to control and favorably influence the pressures and the flows of the fiber suspension in the grinding area of a grinding machine used for the method.
  • the invention can be taken into account that more highly ground pulp is often more sensitive to high secondary edge load. Wider blades result in otherwise identical geometrical
  • the trimmings are pressed against each other so that the desired performance can be transmitted.
  • relatively high grinding pressures occur, the amount of which depends on the area that the grinding bar has at the corresponding point of the clothing.
  • the grinding pressures which occur can be adapted to the requirements of the grinding process by changing the blade width over the axial extension of the clothing.
  • the blade width can be greater at the radially outer regions, whereby there the grinding pressure is lower than in the more inner.
  • the width of the nuches between the knives depends on how the measures already mentioned (uneven blade width) are carried out. It can also be said that the invention makes it possible to coordinate knife width and groove width, in which both the special requirements for edge loading and grinding pressure as well as the flow guidance within the unit are taken into account.
  • the grooves are to be regarded as flow channels for the suspension. It can be assumed that as a result of the rotational movement of the rotor and the pulp suspension entrained by it, a strong pressure build-up takes place from the radially inner to the radially outer regions. Similar events occur in Centrifugal pumps on, of course, in much stronger form.
  • Fig. 1 the implementation of the method using the example of a
  • FIG. 1 a shows a modification of the stator assembly shown in FIG. 1;
  • FIG. Figure 2-4 each a part (sector) of a usable according to the invention
  • Fig. 5 the implementation of the method using the example of a
  • the method according to the invention can be carried out in a grinding device, as shown schematically in section in FIG.
  • a stator 8 On a stator 8 is a Mahlgarnitur 1 and on a rotor 9, a grinding set 2 releasably secured by means of screws 12.
  • the meal sets 1 and 2 are sets of knives provided with grinding bars 3, e.g. can be seen in plan view in Figs. 2-4.
  • the suspension S to be grounded passes through the center of the stator 8 into the grinding sets 1 and 2.
  • the axial distance between the grinding sets 1 and 2 is greatly exaggerated. In operation, it is only fractions of a millimeter.
  • the suspension S passes through the cooperating Mahlgarnituren 1 and 2, exits at the outlet side again, collects in the annular space 7 and partially leaves the annular space 7 via a corresponding nozzle. Another portion of the suspension flows through the lying between the grinding bars 3 grooves 4 in the stator 8 at least through part of their length back. In special cases, it may be advantageous if the grooves 4 in the stator 8 are closed on the inside (see Fig. 1 a), because this also favors the return flows.
  • the rotor 9 is driven by a shaft 1 1. Not shown are the means known per se, with which a force is generated to press the two Mahlgarnituren against each other.
  • a standard grinding set has a large number of grinding bars. This is represented by figures 2 to 4 on the basis of sectors, without here a mecanicstäbl iche drawing vorlie.
  • Many sets for disc and Doppelusionnrefiner are constructed so that on a base plate 13 (annular or sectioned) strip-shaped elevations, ie the Mahlleisten 3,
  • the cross-section of the grinding strips 3 is generally rectangular, although there are other shapes as well.
  • the grooves 4 which for example also have a rectangular cross-section and which serve as flow channels for the suspension, are located between the grinding strips 3.
  • Their groove depth T is advantageously between 2 and 20 mm (see FIG the grinding bars 3 of the grinding sets 1 and 2 are drawn, that is to say hatched, and a 90 ° sector of the grinding set is shown in Fig. 2, the grinding bars 3 being radially outwardly from inside to outside with respect to their blade width 5
  • the set shown is designed such that the grooves 4 lying between the grinding strips 3 have a constant groove width 6.
  • the F FIG. 3 shows another set 1 or 2 which is likewise suitable for the method, in which the grinding bars 3 have a constant blade width 5, while the intermediate grooves 4 are considerably narrower radially inwards than radially outwardly. (Groove width 6 in less than outside).
  • the set shown in FIG. 3 is used with particular advantage as a stator assembly, for example in cooperation with a rotor assembly according to FIG. 2 or FIG. 4.
  • FIG. 4 Another possibility is shown in FIG. 4 in a Mahlgarnitur with Mahlleisten 3, the blade width 5 is constant, while the lying between them lying grooves 4 in Rad ialer direction decreases from the inside to the outside. (Groove width 6 inside larger than outside). Not all grinding bars are shown here.
  • This illustration also shows measures that may be required when constructing annular grinding sets geometrically so that as many grinding bars as possible can be accommodated. This is done here by a number of shorter Mahlleisten 3 ' in the radially outer region. Such measures are familiar to the detail designer of such Mahlgarnituren and therefore only hinted at here.
  • Sets of the type according to FIG. 4 are particularly suitable as rotor sets.
  • the method can also be designed so that in addition to, in particular in combination with the measures described in the claims, the flow cross section in the grooves 4 is changed by different groove depth T.
  • the groove depth increases or decreases from the inside to the outside, the increase of the groove depth T in the stator and the decrease in the rotor being particularly advantageous. This also makes it possible to influence the return flow in the grooves, in particular to promote the transfer of the suspension flowing back into the grooves into the grinding zone.

Abstract

La présente invention concerne un procédé pour le broyage de fibres cellulosiques en suspension aqueuse, qui utilise au moins deux unités de broyage (1, 2) dont l'une est entraînée sur un stator (8) et l'autre sur un rotor (9). La suspension (S) à broyer est traitée entre les deux unités de broyage (1, 2). En l'occurrence, les unités de broyage (1, 2) utilisées sont utilisées au moins en partie avec des barres de broyage (3) de largeurs (5) de couteaux inégales et/ou avec des rainures (4) ayant des largeurs (6) de rainure différentes. De ce fait, la sollicitation spécifique des bords peut être ajustée de manière optimale à l'état des fibres à broyer.
PCT/EP2010/051852 2010-02-15 2010-02-15 Procédé pour broyer des fibres cellulosiques en suspension aqueuse et unité de broyage pour sa mise en oeuvre WO2011098147A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/EP2010/051852 WO2011098147A1 (fr) 2010-02-15 2010-02-15 Procédé pour broyer des fibres cellulosiques en suspension aqueuse et unité de broyage pour sa mise en oeuvre

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2010/051852 WO2011098147A1 (fr) 2010-02-15 2010-02-15 Procédé pour broyer des fibres cellulosiques en suspension aqueuse et unité de broyage pour sa mise en oeuvre

Publications (1)

Publication Number Publication Date
WO2011098147A1 true WO2011098147A1 (fr) 2011-08-18

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2010/051852 WO2011098147A1 (fr) 2010-02-15 2010-02-15 Procédé pour broyer des fibres cellulosiques en suspension aqueuse et unité de broyage pour sa mise en oeuvre

Country Status (1)

Country Link
WO (1) WO2011098147A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2650432A1 (fr) * 2012-04-13 2013-10-16 Andritz, Inc. Plaques de raffineur réversibles à faible énergie
US9988762B2 (en) * 2014-05-07 2018-06-05 University Of Maine System Board Of Trustees High efficiency production of nanofibrillated cellulose

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5836525A (en) * 1994-04-08 1998-11-17 A.R.T.E. Parc Equation Lining for a refiner
EP1088932A2 (fr) * 1999-09-28 2001-04-04 J&L Fiber Services, Inc. Disque de raffineur et procédé
US20020185560A1 (en) * 2001-06-07 2002-12-12 Johansson Ola M. Adjustable refiner plate pattern
US20040149844A1 (en) * 2002-04-25 2004-08-05 Peter Antensteiner Refiner plates with logarithmic spiral bars
DE202005007551U1 (de) 2005-05-12 2005-07-21 Voith Paper Patent Gmbh Schraubverbindung zur Befestigung einer zur Bearbeitung von Faserstoff geeigneten Garnitur sowie Mahlgarnitur
WO2007065971A1 (fr) * 2005-12-05 2007-06-14 Metso Paper Inc Lame et segment de raffineur, ainsi qu’un procédé de formation de ceux-ci et un procédé de modification des rainures des lames

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5836525A (en) * 1994-04-08 1998-11-17 A.R.T.E. Parc Equation Lining for a refiner
EP1088932A2 (fr) * 1999-09-28 2001-04-04 J&L Fiber Services, Inc. Disque de raffineur et procédé
US20020185560A1 (en) * 2001-06-07 2002-12-12 Johansson Ola M. Adjustable refiner plate pattern
US20040149844A1 (en) * 2002-04-25 2004-08-05 Peter Antensteiner Refiner plates with logarithmic spiral bars
DE202005007551U1 (de) 2005-05-12 2005-07-21 Voith Paper Patent Gmbh Schraubverbindung zur Befestigung einer zur Bearbeitung von Faserstoff geeigneten Garnitur sowie Mahlgarnitur
WO2007065971A1 (fr) * 2005-12-05 2007-06-14 Metso Paper Inc Lame et segment de raffineur, ainsi qu’un procédé de formation de ceux-ci et un procédé de modification des rainures des lames

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2650432A1 (fr) * 2012-04-13 2013-10-16 Andritz, Inc. Plaques de raffineur réversibles à faible énergie
CN103374849A (zh) * 2012-04-13 2013-10-30 安德里兹有限公司 可反转的低能耗精磨机板
US9085850B2 (en) 2012-04-13 2015-07-21 Andritz Inc. Reversible low energy refiner plates
US9988762B2 (en) * 2014-05-07 2018-06-05 University Of Maine System Board Of Trustees High efficiency production of nanofibrillated cellulose

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