EP0919662A2 - Raffineur de pâte à papier - Google Patents

Raffineur de pâte à papier Download PDF

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Publication number
EP0919662A2
EP0919662A2 EP98309446A EP98309446A EP0919662A2 EP 0919662 A2 EP0919662 A2 EP 0919662A2 EP 98309446 A EP98309446 A EP 98309446A EP 98309446 A EP98309446 A EP 98309446A EP 0919662 A2 EP0919662 A2 EP 0919662A2
Authority
EP
European Patent Office
Prior art keywords
disc
stock
resonance
refiner
pulp
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Withdrawn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
EP98309446A
Other languages
German (de)
English (en)
Other versions
EP0919662A3 (fr
Inventor
Robert Prof. Head of Mechanical & Whalley
David Mitchell
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.)
University of Bradford
Original Assignee
University of Bradford
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 University of Bradford filed Critical University of Bradford
Publication of EP0919662A2 publication Critical patent/EP0919662A2/fr
Publication of EP0919662A3 publication Critical patent/EP0919662A3/fr
Withdrawn legal-status Critical Current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

Definitions

  • the present invention relates to a method of operating a pulp refiner and to a pulp refiner when operating according to the method and to a pulp refiner.
  • Preparation of the basic raw material (stock) for the continuous Fourdrinier and Inverform sheet generating machines is usually a batch process using refining machines, often in series, to disperse, dilute and shred wood pulp or waste paper in aqueous solution. Following preparation large holding tanks for the reduced, dilute pulp/waste paper stock are filled and continuously agitated in readiness for discharge to the forming machine flow box.
  • the preparation capacity for each continuous paper making process comprises multiple beating and refining units which are used to simultaneously shred, "open” and fibrillate fibres to a given consistency commensurate with the product specification.
  • the setting of the processing plant to achieve the required aqueous fibre solution is therefore of great importance upon which the physical properties of the final product depends.
  • Modern disc refiners run at high speed employing two or more grooved discs to achieve specific cutting and shearing actions. Generally the pulp/product is cycled through twin stator disc arrangements, in series or parallel until the desired composition of the refined homogeneous mixture is achieved.
  • a method of operating a pulp refiner incorporating at least one rotatable disc comprises supplying stock comprising pulp in fluid to the refiner, causing the stock to pass between a rotating face of a disc and an adjacent face to refine the pulp, and removing refined stock, the method being characterised in that the rotating disc is caused to resonate during rotation.
  • the method may comprise maintaining the disc in resonance during substantially all of the refining period.
  • the method may comprise monitoring the resonance, for instance by monitoring the resonance of a shaft on which the disc is mounted.
  • the method may comprise varying the rate of supply of stock in dependence upon the resonance monitored.
  • the method may comprise varying the rate of rotation of the disc in dependence upon the resonance monitored.
  • the method may comprise supplying stock in pressure pulses and the method may comprise varying the frequency of those pressure pulses in dependence upon the resonance monitored.
  • the method may comprise attempting to maintain the resonance at a maximum value. That maximum value may be arranged to be between two lesser values at either side of that maximum value, for instance such that increasing the pulsation rate causes the resonance to go first from a lesser value then to a higher value and then to a lower value.
  • the method may comprise inducing the resonance by causing harmonic vibration of the disc.
  • the method may comprise causing stock to pass between adjacent faces on each side of the disc to cause refinement of the pulp on each side of the disc.
  • the method may comprise causing pulp to move through the disc in order to reach both sides of the disc.
  • the method may comprise subjecting the stock to a varying shear force as the stock passes through the adjacent faces.
  • the method may comprise causing the disc to move sequentially faster and slower to thereby resonate the disc.
  • the method may comprise the disc moving alternately faster and slower than the adjacent portion of stock.
  • the method may comprise the rotating disc alternately inducing an accelerating then a deceleration action on the adjacent stock.
  • the method may comprise a shaft to which the disc is connected oscillating in a torsional manner.
  • the method may comprise causing the stock to pass through a reduced gap between the opposed faces as a result of the resonance and using less power in order to cause the fluid to go through that reduced gap than would otherwise be required if the gap was maintained at that reduced level throughout the refinement.
  • the present invention also includes a pulp refiner when operating as herein referred to.
  • a pulp refiner incorporates a rotatable disc, the rotatable disc having a face adjacent to but spaced from a further face, through which faces, in use, stock comprising pulping fluid is arranged to pass, the refiner including stock supply means and means to monitor the resonance of the disc and means to alter the operating conditions of the refiner in order to maintain the resonance at an optimum level.
  • the means to alter the operating conditions of the refiner may comprise means to alter the flow rate of stock to the refiner and means to alter the frequency of pressure change in stock supplied to the refiner.
  • the present invention includes any combination of the features and limitations referred to.
  • a rotor disc 12 is connected to a drive shaft 14 which is connected via a coupling 16 to a motor 18.
  • the shaft 14 is rotatably supported on spaced bearings 20.
  • the refiner has a stock inlet 22 leading to a chamber 24 within a hinged housing 26. Stock leaves the refiner through an outlet 28.
  • stock is supplied from a centrifugal pump 30, through the inlet 22 and into the chamber 24 on both sides of the rotor disc 12.
  • the stock flows from one side of the disc to the other through circumferentially spaced openings 32 formed in the rotor disc.
  • Stock flows outwardly relative to the rotational axis of the shaft between working faces 34 on each side of the disc 12 and adjacent working faces 36 on a pair of stator discs 38.
  • Material that leaves the radially outer cooperating regions of the discs flows into a circumferential chamber 40 and then through the outlet 28 for further processing into paper or board manufacture, for instance.
  • each of the working faces 34 and 36 comprises sectors 42 that are divided by channels 44 that lead from the inner chamber 24 to the circumferential chamber 40.
  • the channels 44 extend from inner to outer parts of the sectors but they are offset from a radial direction.
  • Each sector includes a series of ribs 46 that extend parallel with each other in a direction parallel with a channel 44 at one side of the sector.
  • the stock between the rotor and stator will be moving in a circumferential direction and the oscillatory circumferential movement of the rotor may cause the relative circumferential speeds of the rotor to oscillate between the rotor speed being repeatedly greater and then less than the circumferential speed of the acjacent stock.
  • the fibres in the fluid may be subject to low frictional levels in order to achieve torsional oscillation which may be preferable to high frictional non-oscillatory conditions.
  • the resonation could occur in the same circumferential direction simultaneously around the periphery of the rotor disc with the flexure that permits such resonation coming from slight torsional movement of the shaft 14.
  • the resonance of the rotor disc may be induced or be assisted in being induced by the pressure pulses coming from the centrifugal stock supply pump. This resonance may increase when the speed of the rotor is set at a certain rate that causes harmonic resonance of the rotor disc.
  • the refiner may be preset such that, for a given stock supply and for a given rate of supply of the stock, the rotor disc will be caused to rotate at a predetermined mean rate to maximise circumferential vibration.
  • the rate of supply of stock may be altered to a preset level for a given constitution of stock and for a given motor speed in order to maximise resonance.
  • the resonance of the rotor disc can be monitored with the rate of stock supply or the rate of rotation of the rotor being altered or both of those rates being altered to maintain optimum stock processing.

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  • Paper (AREA)
EP98309446A 1997-11-25 1998-11-18 Raffineur de pâte à papier Withdrawn EP0919662A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9724750 1997-11-25
GB9724750A GB2331469A (en) 1997-11-25 1997-11-25 Pulp refiner

Publications (2)

Publication Number Publication Date
EP0919662A2 true EP0919662A2 (fr) 1999-06-02
EP0919662A3 EP0919662A3 (fr) 2000-04-26

Family

ID=10822517

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98309446A Withdrawn EP0919662A3 (fr) 1997-11-25 1998-11-18 Raffineur de pâte à papier

Country Status (2)

Country Link
EP (1) EP0919662A3 (fr)
GB (1) GB2331469A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111373091A (zh) * 2017-11-24 2020-07-03 福伊特专利有限公司 研磨设备

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114534660B (zh) * 2021-12-31 2023-08-18 成都普美怡科技有限公司 一种工业用磨盘形固相力化学反应器

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH355770A (de) * 1957-04-30 1961-07-31 Forsch Inst Professor Ing Chem Verfahren und Apparatur zur kontinuierlichen oder chargenweisen Behandlung von Stoffen und Stoffgemischen
GB891152A (en) * 1957-11-21 1962-03-14 Peter Willems A method and apparatus for continuously changing the structure of substances or mixtures of such substances
CA1105604A (fr) * 1978-06-07 1981-07-21 James H. Rogers Traduction non-disponible
US4627578A (en) * 1979-12-19 1986-12-09 Tasman Pulp And Paper Company Limited Methods of and/or apparatus for detecting and controlling refiner plate clashing
SE454189B (sv) * 1985-05-06 1988-04-11 Sunds Defibrator Sett att kontrollera den framstellda massans egenskaper i en raffinorprocess genom utnyttjande av uppmetta vibrationer i maldonen
CA1207572A (fr) * 1985-06-06 1986-07-15 William C. Leith Raffineur de copeaux a disques
WO1991010904A1 (fr) * 1990-01-11 1991-07-25 Pulp And Paper Research Institute Of Canada Controle par emission acoustique de raffineurs de copeaux de bois

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111373091A (zh) * 2017-11-24 2020-07-03 福伊特专利有限公司 研磨设备

Also Published As

Publication number Publication date
GB9724750D0 (en) 1998-01-21
GB2331469A (en) 1999-05-26
EP0919662A3 (fr) 2000-04-26

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