EP0968329B2 - Verfahren zur herstellung einer materialbahn - Google Patents

Verfahren zur herstellung einer materialbahn Download PDF

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Publication number
EP0968329B2
EP0968329B2 EP97921016A EP97921016A EP0968329B2 EP 0968329 B2 EP0968329 B2 EP 0968329B2 EP 97921016 A EP97921016 A EP 97921016A EP 97921016 A EP97921016 A EP 97921016A EP 0968329 B2 EP0968329 B2 EP 0968329B2
Authority
EP
European Patent Office
Prior art keywords
stock
wire
ultrasound
section
ultrasound energy
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.)
Expired - Lifetime
Application number
EP97921016A
Other languages
English (en)
French (fr)
Other versions
EP0968329A1 (de
EP0968329B1 (de
Inventor
Philip Hakansson
Tommy Carlsson
Anders Wigsten
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.)
Stora Enso AB
Original Assignee
Stora Enso AB
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
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Application filed by Stora Enso AB filed Critical Stora Enso AB
Priority to DE69737300T priority Critical patent/DE69737300T3/de
Priority claimed from PCT/SE1997/000466 external-priority patent/WO1998041683A1/en
Publication of EP0968329A1 publication Critical patent/EP0968329A1/de
Application granted granted Critical
Publication of EP0968329B1 publication Critical patent/EP0968329B1/de
Publication of EP0968329B2 publication Critical patent/EP0968329B2/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/18—Shaking apparatus for wire-cloths and associated parts
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F9/00—Complete machines for making continuous webs of paper
    • D21F9/003—Complete machines for making continuous webs of paper of the twin-wire type

Definitions

  • the invention relates to a method to improve, in the production of a web which to an essential part consists of cellulosic fibres, the formation of the web material in a one or plural wire machine by, to an essential part, dispersing existing flocks in the stock which is led from an inlet box out onto at least one wire, and to counteract the reformation of flocks in the stock on the wire.
  • the description also includes a short account of a device for performing the method and of a method to clean press felts and wires.
  • the raw material is mainly cellulosic fibres and in most cases also fillers, such as calcium carbonate and/or clay, retention agents and so on are included.
  • the included components tend, in connection with the production of paper and board, to form flocks in the stock with poor distribution of the components as a result.
  • the formation is used as a measurement of how even the components, mainly the fibres and fillers, which are included in the paper or board, are distributed.
  • the formation is a very important property of paper and board.
  • a paper or board with poor formation gives a stained impression, has poorer printing properties and poorer strength than a paper or a board with good formation.
  • By improving the formation essential improvements in quality can be achieved.
  • the basis weight of the paper or board can be decreased with sustained strength, which results in a not unessential economic potential.
  • top wire structures can also be said to be a part of this goal, although the installation of top wires in the first place is dictated by other purposes.
  • EP-A-0318107 discloses a method of forming a fibrous web in a paper-machine, in which method stock is introduced into a wedge-like space or gap. According to one aspect of the method, the formation of flocks is prevented by supplying into the gap energy in the form of a mechanical high-frequency vibration, preferably in the ultrasonic range, said energy causing the breaking down of flocks.
  • the object of the invention is to attack the above problems. This is, in connection with the method described in the introduction, achieved by ultrasound energy being furnished to the stock in a plurality of wire sections, suitably by the ultrasound energy being furnished to the stock on the wire in at least one cross directional section of the wire sections along the transport direction of the stock on the wire.
  • the ultrasound energy is furnished as ultrasound waves with frequencies between 15 and 75 kHz, which has surprisingly shown to result in considerably better formation when ultrasound elements (ultrasound generators or elements which can transmit ultrasound energy from one or more generators), which emit energy by means of oscillation with said frequency, are placed within the wire section of a paper or board machine in such a way that ultrasound energy is transmitted to the stock on the wire.
  • the ultrasound energy transmitting elements should be positioned directly below the wire or wires which follow after the inlet box or boxes of the paper or board machine. As a consequence of this positioning, the effect can also be achieved that the wire or wires are cleaned.
  • the elements are moreover positioned so that an optimal effect, i.e. optimal ultrasound energy per mass unit of the stock (suspension of fibres/fillers) is achieved, at the same time as it is important that the concentration of the stock (the dry content) in at least one or some of said sections of the wire section still is adequately low so that flocks which are formed are not bound too strong, but can be broken apart. Consequently, at least some ultrasound elements are positioned e.g.
  • the stock on the wire has a concentration of between 0,2 and 6 %, suitably between 0,5 and 5 % or between 1 and 6 %.
  • a conceivable optimal range of content can also be between 1,5 and 5 %.
  • a positioning of the ultrasound elements further back on the paper machine, e.g. in or on the inlet box, will for certain result in that flocks which may have been formed possibly can be dispersed there, but these can afterwards be reformed on the wire or wires.
  • the concentration of the stock is more than 5 or 6 %, preferably in order to prevent flocks from being reformed. It can for example be conceived to place ultrasound elements within sections of the area which is common for a top wire section and a sub wire section, within which sections the concentration of the stock may be considerably higher than 5 à 6 % or up to 15 %, preferably a maximum of 12%, as well as within the introductory section of the sub wire, where the concentration of the stock may be lower than 5 à 6 %.
  • the ultrasound elements within the introductory section of the sub wire, where the concentration of the stock is 0.2-6 %, preferably 0.5-5 % or 1-6 %, e.g.
  • ultrasound elements which transmit the ultrasound energy to the stock are arranged in a wire loop in contact with the inside of the wire in the loop in the area of the distribution of the stock and thus also in contact with the liquid in the stock via the wire and via the mesh interspaces in the wire for transmission of the ultrasound energy to the stock via the wire and directly to the liquid phase via the mesh interspaces.
  • the ultrasound elements may be arranged in a sub loop and/or in a top loop.
  • the ultrasound elements may be arranged opposite each other in a sub wire loop and in a top wire loop.
  • the ultrasound elements and/or ultrasound generators which are connected to the ultrasound elements are adjustable in respect of power and/or frequency which is transmitted to the stock.
  • the ultrasound elements may consist of separate units.
  • the ultrasound elements may be integrated with one or some dewatering elements of the type which include formation tables, foils and suction boxes.
  • the ultrasound energy is furnished to the stock on the wire within a plurality of cross directional sections which are arranged after each other, e.g. within three to five after each other following, cross directional sections. This will also result in a possibility to adapt the frequency and/or power of the ultrasound to the concentration of the stock within different sections of the wire section, so that e.g. ultrasound energy with a higher frequency is furnished in at least one section which is closer to the inlet box, than within a subsequent section further away from the inlet box.
  • the ultrasound elements are suitably arranged so that the ultrasound power (amplitude) and/or the frequency can be controlled.
  • an optimisation of the formation will be possible, so that it can be adapted to the composition of the stock. Consequently, flocks which contain larger amounts of fines and fillers should demand a higher frequency than e.g. a stock which is based on a hard wood pulp with short fibres, which may demand a somewhat lower frequency.
  • the lowest frequency should be demanded in connection with the dispersion of fibres from soft wood pulp with long fibres.
  • the wire speed has effect on suitable frequency and/or power.
  • the optimisation of the frequency and power of the ultrasound elements can of course be made by means of a parent control and regulation equipment.
  • the ultrasound elements may consequently operate sequentially by changing the frequency and/or power or also the elements may be dedicated for certain prechosen frequencies and/or powers which attack certain flock sizes or a certain content of flock.
  • One aspect of the invention is characterised in that the ultrasound elements are equipped to operate in this way. Further features and aspects of the invention are apparent from the subsequent claims.
  • a water spray can be positioned either on the same side as the ultrasound element or on the opposite side in order to supply the water volume which is necessary to transmit the ultrasound from the element to the inner structure of the felt or wire.

Landscapes

  • Paper (AREA)
  • Forging (AREA)
  • Powder Metallurgy (AREA)
  • Reverberation, Karaoke And Other Acoustics (AREA)

Claims (5)

  1. Verfahren zur Verbesserung der Bildung des Bahnmaterials bei der Herstellung einer Bahn, welche zu einem wesentlichen Teil aus Cellulosefasern besteht, in einer oder mehreren Siebmaschinen durch Liefern von Ultraschallenergie an einen Papierstoff auf einem Sieb, wobei dieser Papierstoff aus einer Einlassbox auf genanntes Sieb geführt wird, um, zu einem wesentlichen Teil, bestehende Flocken auf dem Papierstoff zu verteilen, dadurch gekennzeichnet, dass Ultraschallenergie als Ultraschallwellen mit Frequenzen zwischen 15 und 75 kHz an den Papierstoff auf dem Sieb innerhalb einer Vielzahl von Siebabschnitten in Querrichtung, die hintereinander angeordnet sind, geliefert wird, so dass Neubildung der Flocken in dem Papierstoff auf dem Sieb entgegengewirkt wird.
  2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass die Ultraschallenergie an den Papierstoff innerhalb von drei bis fünf Abschnitten in Querrichtung, die nacheinander angeordnet sind, bereitgestellt wird.
  3. Verfahren nach einem der Ansprüche 1 - 2, dadurch gekennzeichnet, dass die Ultraschallenergie an den Papierstoff innerhalb mindestens irgendeines Abschnitts geliefert wird, wo der Papierstoff auf dem Sieb eine Konzentration (Trockengehalt) von zwischen 0,2 und 6 %, vorzugsweise zwischen 0,5 und 5 % oder zwischen 1 und 6 %, zweckmäßigerweise zwischen 1,5 und 5 % aufweist.
  4. Verfahren nach Anspruch 3, dadurch gekennzeichnet, dass die Ultraschallenergie auch an den Papierstoff innerhalb mindestens irgendeines Abschnitts geliefert wird, wo die Konzentration des Papierstoffes 5 - 15 %, vorzugsweise 6 - 12 % beträgt.
  5. Verfahren nach einem der Ansprüche 1 - 4, dadurch gekennzeichnet, dass die Ultraschallenergie an den Papierstoff innerhalb des Bereiches der ersten Hälften der Siebabschnitte geliefert wird.
EP97921016A 1997-03-20 1997-03-20 Verfahren zur herstellung einer materialbahn Expired - Lifetime EP0968329B2 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE69737300T DE69737300T3 (de) 1997-03-20 1997-03-20 Verfahren zur herstellung einer materialbahn

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/SE1997/000466 WO1998041683A1 (en) 1995-10-13 1997-03-20 Method and device in the production of a web material

Publications (3)

Publication Number Publication Date
EP0968329A1 EP0968329A1 (de) 2000-01-05
EP0968329B1 EP0968329B1 (de) 2007-01-24
EP0968329B2 true EP0968329B2 (de) 2012-04-04

Family

ID=20405745

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97921016A Expired - Lifetime EP0968329B2 (de) 1997-03-20 1997-03-20 Verfahren zur herstellung einer materialbahn

Country Status (5)

Country Link
US (1) US20020050328A1 (de)
EP (1) EP0968329B2 (de)
AT (1) ATE352661T1 (de)
DE (1) DE69737300T3 (de)
PT (1) PT968329E (de)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10022110B4 (de) * 2000-05-08 2007-10-25 Dieter Ronnenberg Beeinflussung eines Bahneigenschafts-Profiles mittels mindestens eines Schallfeldes
ATE317373T1 (de) * 2001-12-11 2006-02-15 Ufo Ab Ultraschallwandlersystem
US7261823B2 (en) * 2003-06-27 2007-08-28 Ultra Technology Europe Ab Ultrasonic transducer system
AT527974A1 (de) * 2024-01-30 2025-08-15 Mondi Ag Verfahren zur Herstellung von Kraftpapier

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1005530A (fr) † 1947-08-01 1952-04-11 Perfectionnements à la fabrication mécanique du papier
FR2110591A5 (en) † 1970-10-16 1972-06-02 Beloit Corp Paper stock distributor - homogenising particle distribution using gravity agitation and compression waves
US4391672A (en) † 1981-03-16 1983-07-05 Valmet Oy Method used in paper making for treatment of a weave
US4735868A (en) † 1986-05-27 1988-04-05 Olin Corporation Composites having improved resistance to stress relaxation
US4999088A (en) † 1989-04-24 1991-03-12 Tim Tikkanen No-box system with booster head spray for delivering paper stock to a paper machine
WO1995028521A1 (en) † 1994-04-14 1995-10-26 Bo Nilsson Use of ultrasonics in connection with paper making

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1005530A (fr) † 1947-08-01 1952-04-11 Perfectionnements à la fabrication mécanique du papier
FR2110591A5 (en) † 1970-10-16 1972-06-02 Beloit Corp Paper stock distributor - homogenising particle distribution using gravity agitation and compression waves
US4391672A (en) † 1981-03-16 1983-07-05 Valmet Oy Method used in paper making for treatment of a weave
US4735868A (en) † 1986-05-27 1988-04-05 Olin Corporation Composites having improved resistance to stress relaxation
US4999088A (en) † 1989-04-24 1991-03-12 Tim Tikkanen No-box system with booster head spray for delivering paper stock to a paper machine
WO1995028521A1 (en) † 1994-04-14 1995-10-26 Bo Nilsson Use of ultrasonics in connection with paper making

Also Published As

Publication number Publication date
ATE352661T1 (de) 2007-02-15
EP0968329A1 (de) 2000-01-05
DE69737300D1 (de) 2007-03-15
DE69737300T3 (de) 2012-10-25
DE69737300T2 (de) 2007-08-30
EP0968329B1 (de) 2007-01-24
PT968329E (pt) 2007-04-30
US20020050328A1 (en) 2002-05-02

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