EP2562307A1 - Ersatzteile für Scheibenrefiner zur Papierherstellung - Google Patents

Ersatzteile für Scheibenrefiner zur Papierherstellung Download PDF

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Publication number
EP2562307A1
EP2562307A1 EP11179053A EP11179053A EP2562307A1 EP 2562307 A1 EP2562307 A1 EP 2562307A1 EP 11179053 A EP11179053 A EP 11179053A EP 11179053 A EP11179053 A EP 11179053A EP 2562307 A1 EP2562307 A1 EP 2562307A1
Authority
EP
European Patent Office
Prior art keywords
disc
rotor
spare part
refining
stator
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.)
Ceased
Application number
EP11179053A
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English (en)
French (fr)
Inventor
Michele Ghibellini
Luca Ghibellini
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.)
OFFICINE AIRAGHI Srl
Original Assignee
OFFICINE AIRAGHI Srl
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 OFFICINE AIRAGHI Srl filed Critical OFFICINE AIRAGHI Srl
Priority to EP11179053A priority Critical patent/EP2562307A1/de
Publication of EP2562307A1 publication Critical patent/EP2562307A1/de
Ceased legal-status Critical Current

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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 present invention refers to a spare part for disc refiners used in the production of paper.
  • the present invention refers to a spare part consisting of, respectively, a stator and/or a rotor used in a low consistency disc refiner for the preparation of pulp and paper stock, meaning that it has a dry fibre residue between 2% and 6%.
  • the pulp enters them from one end and exits from other side, passing through a rotating body equipped with blades or an alternation of solids and voids (blades, holes, etc., derived from mechanical processing and made on one face or both) and a shell which has fixed counter-acting blades.
  • Such alternation of solids and voids (bars and grooves) alternation is conventionally defined as "pattern".
  • the present invention has applications in applied mechanics in the field of paper making and more specifically in the low consistency refining.
  • the refining process represents the only phase of the entire paper making process in which the fibres are physically modified. It consists of a mechanical action in which the fibres are processed through two or more consumable bladed fillings (rotors or stators).
  • the fibrous pulp which arrives at the refiner in the form of a low consistency aqueous blend (meaning that it generally has a dry fibre residue between 2% and 6%), must pass through the existing spaces between two (or more) opposing spare parts, respectively comprising a rotor and a stator.
  • the stator is defined as the specific spare part with a fixed, static position inside the refiner
  • the rotor is defined as the specific spare part with a mobile position, which when rotating generates a centrifugal effect for the refining the fibrous pulp.
  • the stator and the rotor in a low consistency disc refiner both comprise substantially discoid metallic elements which each have a blade refining surface with an alternation of blades (bars) and grooves, all of which have the same height (blades) and depth (grooves).
  • the rotor being the part which generates the motion, is normally driven around its own axis of rotation in such a way that the blades of the rotor perform a rotary movement in front of the blades of the stator with the interposition of an appropriate air gap of constant height on all of the opposing surfaces of the discs.
  • the fibres are subject to high levels of compression, friction and cutting, which determine major (and unique) modifications to their physical structure.
  • Modern refiners for processing low consistency fibrous pulp may be classified in 2 principle classes: conical and disc.
  • the rotor and the stator have on one side a "pattern", alternately consisting of blades (or bars) and crevices (or grooves).
  • the width, the length and the inclination of the bars (or blades) and the width and depth of the empty spaces (or grooves) constitute the configuration of the spare parts upon which the performance of the refiner depends.
  • the principal characteristic is the angle of the cone.
  • the first conical refiners had a narrow angle: they are in fact assembled with a cone which forms an approximately 10° angle with respect to the axis of rotation, with spare parts which have quite large bars and for this reason they are considered strong action cutting refiners.
  • conical refiner is the so called large angle refiner, the structure of which is similar to that with a narrow angle but is assembled with spare parts with an approximate 30° angle with respect to the axis of rotation.
  • the conical spare parts are used to limit axial forces.
  • the pulp which has to be refined in this case is fed centrally to the area between the discs and, due to the centrifugal force produced by the rotation of the rotor disc, the pulp tends to move toward the periphery, undergoing the rubbing action between the bars of the stator discs (fixed) and the bars of the rotor discs (mobile).
  • this type of refiner is distinguished for its very compact structure.
  • Disc refiners have three basic layouts depending on the type of spare part used:
  • Disc refiners can be further divided depending on the direction of the flow of pulp inside the refiners themselves.
  • the centrifugal force and the flows of the vortices on the inside of the conical refiner create and facilitate the passage of the fibres from the grooves toward the bars.
  • the conical refiner therefore, permits an improvement in processing, a more complete and uniform treatment of the fibres and an improvement in energy efficiency which is also due to the fact that the fibres are in contact with the bar for a longer time.
  • the fibres are not free to move independently.
  • a non-homogenous structure composed of fibres which, being close to one another, interact between themselves and generate flakes; such flakes form and break up continually under the effect of the different intensities of the cutting forces which exist in the grooves and in the refining zone.
  • the size and the thickness of the flakes (1-5 mm) are much larger compared to the distance which is found between the bars of the stator and the rotor in the refining phase (usually even less than a few tenths of a millimetre.)
  • the operative energy is transferred from the refiner to the pulp in the following three modes:
  • This length is measured in metres or kilometres.
  • the cutting edge length L represents, therefore, the total length of the "contact" between the rotor and stator blades at each turn of the rotor and is expressed as follows: DR x nB 2 x ni / cos ⁇ where:
  • Refining processes involve the use of considerable amounts of energy. In effect, refining accounts for 25-30% of the total requirement of electric energy in paper making and is therefore an important factor.
  • the power required to rotate freely which is subtracted from the current consumption in the refining phase, is the sum of the electric losses of the motor, of the mechanical losses, due to friction in the motor and in the refiner, and of the hydraulic or circulating power, which is the quantity of energy absorbed by the hydraulic action due to the effect of turbulence or pumping.
  • the no-load power depends mainly on the diameter and rotary speed of the rotor part, but it can also be significantly affected by the configuration of the bars and grooves (i.e. by the pattern).
  • the effective power applied therefore, which determines the changes of the properties of the pulp, is constituted by the power consumption in the refining phase from which the no-load power must be subtracted.
  • No-load power can be determined through empirical measurements or calculated according to theoretical formulas.
  • the no-load power NL can vary considerably in time, which means that it has a high value when the spare parts are new and a lower value when they are worn down.
  • This formula shows how the diameter of the disc is a decisive variable in the determination of the no-load power consumption.
  • Document WO 2007/085703 describes a refiner comprising a stator and a rotor that comprise a planar portion and a conical portion after the planar portion, which in turn comprise refining surfaces provided with blade bars and blade grooves there between, and the planar portions of the refining surfaces of the stator and the rotor comprising at least two refining zones in the direction of the radius of the planar portion.
  • the refiner described in this document represents a typical example of an high consistency pulp refiner, meaning that the pulp has a dry residue which is not lower than 22%, in which the pulp is fed through a worm screw feeder.
  • the discs of the high density pulp refiners typically have blades and grooves which consist of an inclination (taper) which forms a funnel entry between the stator and the rotor in order to direct the high consistency pulp between the blades and the grooves of the stator and rotor.
  • the patterns of the stator and rotor disc in low consistency refiners (dry residue between 2% and 6%) are always parallel to each other in order to improve the refining of the cellulose and the distance between the rotor and the stator is therefore constant on all the surfaces of the opposing discs.
  • the present invention provides new spare parts for disc refiners for the refining of low consistency fibre pulp, meaning that it has a dry residue between 2% and 6%, composed of at least one rotor and at least one stator which, thanks to the special configuration of the blade surface, and without any modification to the existing structure of the refiner, simultaneously permits the following:
  • the spare parts for disc refiners according to the present invention have blade surfaces which have a preset angle with respect to the planes which are perpendicular to the axis of rotation of the rotor.
  • the spare parts for disc refiners according to the present invention have blade surfaces with a generally curvilinear or irregular profile, though always parallel to each other.
  • FIG 1 a Cartesian diagram with nonessential errors shows how, at an equivalent cutting edge length, it would be possible to obtain a smaller disc diameter acting on the angle of inclination (x) of the pattern with respect to a pattern which is flat and perpendicular to the axis of the disc itself.
  • FIGS. 2a to 2e show some examples of practical embodiments of the spare parts for disc refiners which are obtainable according to the present invention.
  • profile shapes and the diameters of the discs indicated above are example embodiments of the invention which can be applied to any typology of refining discs for the low consistency fibre pulp, meaning that it has a dry residue between 2% and 6%; the diameter and shape of the discs can be freely adapted to particular design needs to take into account the quantity and quality of the product to be refined.
  • the spare parts according to the present invention can be manufactured using various methods and technologies in accordance with design requirements.

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  • Paper (AREA)
EP11179053A 2011-08-26 2011-08-26 Ersatzteile für Scheibenrefiner zur Papierherstellung Ceased EP2562307A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP11179053A EP2562307A1 (de) 2011-08-26 2011-08-26 Ersatzteile für Scheibenrefiner zur Papierherstellung

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP11179053A EP2562307A1 (de) 2011-08-26 2011-08-26 Ersatzteile für Scheibenrefiner zur Papierherstellung

Publications (1)

Publication Number Publication Date
EP2562307A1 true EP2562307A1 (de) 2013-02-27

Family

ID=44773976

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11179053A Ceased EP2562307A1 (de) 2011-08-26 2011-08-26 Ersatzteile für Scheibenrefiner zur Papierherstellung

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EP (1) EP2562307A1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017191030A1 (de) * 2016-05-04 2017-11-09 Voith Patent Gmbh Verfahren zur steuerung einer vorrichtung zur behandlung von faserstoff
CN111373090A (zh) * 2017-11-24 2020-07-03 福伊特专利有限公司 对纤维料处理的控制

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2535979A1 (de) 1975-08-12 1977-02-24 Alf Sa Einrichtung bei mahlapparaten
US5704559A (en) * 1994-06-29 1998-01-06 Sunds Defibrator Industries Ab Refining element
DE10203752C1 (de) 2002-01-31 2003-09-18 Guenther Schmidt Mahlscheiben-Ausgestaltung für Scheibenmühlen zur Zerkleinerung von stückigem Mahlgut
EP1749922A1 (de) 2005-08-04 2007-02-07 Andritz AG Platte oder Plattensegment sowie Vorrichtung mit derartigen Platten oder Plattensegmenten
WO2007048321A1 (fr) 2005-10-24 2007-05-03 Changsha Zhengda Hi-Tech Paper Machinery Co., Ltd. Piece de disque pour broyeur a attrition
WO2007085703A1 (en) 2006-01-30 2007-08-02 Metso Paper Inc Refiner
DE102008039003A1 (de) * 2008-08-21 2010-02-25 Voith Patent Gmbh Verfahren zur Mahlung von wässrig suspendierten Zellstofffasern sowie Mahlgarnitur zu seiner Durchführung

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2535979A1 (de) 1975-08-12 1977-02-24 Alf Sa Einrichtung bei mahlapparaten
US5704559A (en) * 1994-06-29 1998-01-06 Sunds Defibrator Industries Ab Refining element
DE10203752C1 (de) 2002-01-31 2003-09-18 Guenther Schmidt Mahlscheiben-Ausgestaltung für Scheibenmühlen zur Zerkleinerung von stückigem Mahlgut
EP1749922A1 (de) 2005-08-04 2007-02-07 Andritz AG Platte oder Plattensegment sowie Vorrichtung mit derartigen Platten oder Plattensegmenten
WO2007048321A1 (fr) 2005-10-24 2007-05-03 Changsha Zhengda Hi-Tech Paper Machinery Co., Ltd. Piece de disque pour broyeur a attrition
WO2007085703A1 (en) 2006-01-30 2007-08-02 Metso Paper Inc Refiner
DE102008039003A1 (de) * 2008-08-21 2010-02-25 Voith Patent Gmbh Verfahren zur Mahlung von wässrig suspendierten Zellstofffasern sowie Mahlgarnitur zu seiner Durchführung

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017191030A1 (de) * 2016-05-04 2017-11-09 Voith Patent Gmbh Verfahren zur steuerung einer vorrichtung zur behandlung von faserstoff
CN109154142A (zh) * 2016-05-04 2019-01-04 福伊特专利有限公司 用于对处理纤维的设备进行控制的方法
CN111373090A (zh) * 2017-11-24 2020-07-03 福伊特专利有限公司 对纤维料处理的控制

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