EP2331750B1 - Section de formation avec bande métallique - Google Patents

Section de formation avec bande métallique Download PDF

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Publication number
EP2331750B1
EP2331750B1 EP08804747A EP08804747A EP2331750B1 EP 2331750 B1 EP2331750 B1 EP 2331750B1 EP 08804747 A EP08804747 A EP 08804747A EP 08804747 A EP08804747 A EP 08804747A EP 2331750 B1 EP2331750 B1 EP 2331750B1
Authority
EP
European Patent Office
Prior art keywords
metal belt
web
forming
forming wire
fibrous web
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.)
Not-in-force
Application number
EP08804747A
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German (de)
English (en)
Other versions
EP2331750A1 (fr
Inventor
Riku Pihko
Pekka Pakarinen
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.)
Valmet Technologies Oy
Original Assignee
Metso Paper Oy
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 Metso Paper Oy filed Critical Metso Paper Oy
Publication of EP2331750A1 publication Critical patent/EP2331750A1/fr
Application granted granted Critical
Publication of EP2331750B1 publication Critical patent/EP2331750B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F3/00—Press section of machines for making continuous webs of paper
    • D21F3/02—Wet presses
    • D21F3/0209—Wet presses with extended press nip

Definitions

  • the invention relates to a forming section forming a web consisting of fibers.
  • a forming section is used in a paper machine or the like, in which a suspension containing fibers and a suspension liquid which is usually water is injected between two forming wires and the liquid is then removed in large part, so that a wet web is formed from the fibers. Then, the web runs via a pre-press nip to a pressing section and further into a dryer section, in which sections the web is further treated to obtain the desired properties such as dryness, web bulk, density, thickness, surface properties etc.
  • the web is usually supported on one side of the web by one of the forming wires, since the web is not strong enough in this part of the paper machine to be conveyed alone.
  • the forming wires are susceptible to pressure, so that their lifetime is reduced due to pressing.
  • the forming wire may cause surface markings in the adjacent web surface, which reduce surface smoothness and therefore the paper quality as such.
  • Document DE 10 2004 052 975 A1 discloses a vertical double sieve former assembly for fibrous web of paper or carton having a rising section in contact with a dewatering drum and a secondary belt.
  • a head box discharges a fiber suspension between two rising sieve belts that than make contact with a full-width dewatering belt.
  • the dewatering belt is passed around a series of rollers and also follows a part of a dewatering drum mantle, prior to separation from the fiber web.
  • the dewatering drum is coupled to a suction assembly which operates at the limited peripheral interface between the twin-sieve with fiber suspension and the drum.
  • Document US 5,611,893 discloses a device for dewatering of a paper web including prepressing with an extended nip shoe in which a paper web is transferred from a forming wire onto a wire in a drying section while constantly on support of the fabric that receives water, a transfer fabric or of any other corresponding transfer surface as a closed draw, at a particularly high speed, which is higher than about 25 to 30 m/s.
  • Dewatering of the paper web is carried out by means of at least two subsequent press nips, of which nips at least one press nip is a so-called extended-nip zone, whose length in a machine direction is larger than about 100 mm.
  • the extended-nip zone is formed in connection with a mobile flexible press-band loop.
  • Document WO 03/064762 A1 discloses a processing device and method of operating the device for processing a coated or uncoated fibrous web.
  • This device comprises a belt adapted to extend around a guiding element, at least one counter-element being disposed outside said belt to provide a contact area with the belt, such that the belt and the counter-element established therebetween a web processing zone for passing a web to be processed therethrough.
  • the object of the invention is achieved by a forming section according to claim 1 and by a method for forming a fibrous web according to claim 11, respectively.
  • Advantageous embodiments are carried out according to the dependent claims.
  • fibrous web and “web” include paper, board and other web types made from a fiber containing suspension.
  • the invention relates to paper machines, board machines and the like, although only a paper machine is described for the purpose of explanation; this appeared adequate to maintain clarity of this description.
  • any of the above mentioned web types is addressed.
  • a forming section forming a fibrous web comprises a forming wire loop for forming the fibrous web from a fiber containing suspension as explained above. Additionally, a metal belt loop is arranged to press the web and the forming wire between a metal belt and a support surface.
  • Using a metal belt allows the generation of a long nip by merely using appropriate metal belt arrangement and belt tension.
  • the metal belt is arranged to contact the fibrous web, and the forming wire is arranged to contact the support surface. In other words, the web is sandwiched between the metal belt and forming wire.
  • the metal belt is arranged to press the fibrous web from above pressing the liquid of the suspension towards the forming wire which is arranged below the web. In this way, gravity can be used to support water removal.
  • the metal belt is impervious to fluids, so that the suspension liquid cannot pass through the belt. Furthermore, it is preferable that the surface of the metal belt which contacts the web is smooth, so that an improved surface quality of the web can be obtained after the contact of the web to the metal belt.
  • a heating means can be provided at the metal belt loop for heating the metal belt.
  • a heating means may comprise steam heaters which may use condensation of steam exhibiting a very high heat transmission effect to the metal belt and causing a uniform temperature distribution in the heating area through which the belt travels. Further, temperature control in steam heating is well-known and inexpensive technology.
  • a rapid water removal is promoted, when the support surface is a roll which has surface portions at which the water may exit the forming wire.
  • This can be achieved by e.g. a grooved roll or a suction roll.
  • a suction box may be provided at the forming wire and downstream the support surface and the suction pressure is set to hold the web on the forming wire.
  • the suction box may have a curved cover.
  • the metal belt is a steel belt coated with a low adhesion coating, which avoids that the web sticks to the metal belt, in particular, when the metal belt is heated.
  • a coating heating of the metal belt to comparatively high temperatures is possible, so that temperature increase may be used to promote water removal.
  • the invention further suggests a method for forming a fibrous web from a fiber containing suspension, which uses a step of pressing the web and the forming wire between a metal belt and a support surface.
  • suspension liquid is pressed out of the fibrous web in the forming section already, so that water removal in the subsequent press section is simplified or is made more efficient.
  • Tests have shown that especially in webs having higher basis weights a very high dewatering effect can be achieved, while considerable energy saving is observed as compared to prior art solutions discussed above.
  • the metal belt may be heated and then be brought in contact with the fibrous web.
  • the metal belt may be heated to have a temperature below the boiling point of the suspension liquid, when the metal belt contacts the fibrous web.
  • the metal belt may be heated to have a temperature higher than the boiling point of the suspension liquid, when the metal belt contacts the fibrous web.
  • the liquid at the surface of the web at which the metal belt contacts the web evaporates at or close to the liquid surface.
  • the liquid generates a steam pressure which supports the liquid removal from the web by additionally pressing the liquid towards the forming wire.
  • Liquid removal may further be supported by applying suction pressure to the forming wire at the support surface and/or downstream of the support surface.
  • Fig. 1 shows a forming section of a paper machine which has two forming wire loops 1, 3 and a metal belt loop 2.
  • a transfer loop 4 is shown on the right hand side in Fig. 1 , which transfer fabric loop is used for further transferring the web from the forming section to subsequent sections of the paper machine, e.g. the press section.
  • the transfer fabric loop 4 may comprise a felt or a belt as the transfer fabric.
  • the forming wire loop 3 in which the forming wire 31 runs in counterclockwise direction past a series of guide rolls 35.
  • the forming wire 31 further passes a forming roll 32 which is a suction roll, a suction box 33 and a blow box 34.
  • the forming wire loop 1 has a forming wire 11 which runs in clockwise direction via several guide rolls 14, a transfer roll 13 which is normally a suction roll, a suction roll 12 and a suction box 15.
  • a fiber containing suspension containing the fibers from which the later paper is to be formed of is injected form a head box into the gap between the two forming wires 11 and 31 as is indicated with arrow 10 at the bottom of Fig. 1 .
  • Water from this suspension is rapidly removed in the beginning in forming roll 32 and in the suction box 33.
  • a blow box 34 cooperating with transfer roll 13 is provided using pressure differences to ensure that the web travels along the desired parts, i.e. along with forming wire 11.
  • the web reaches a nip formed between a metal belt 21 of a metal belt loop 2, which nip is particularly formed between a metal belt 21 and a suction roll 12.
  • the metal belt 21 itself is guided by guide rolls 22, 23, 24, so as to run in a counterclockwise direction in Fig. 1 .
  • a heating device 25 may be provided to heat the metal belt.
  • a guide roller 22 is arranged to be movable within the metal belt loop 2, so as to adjust tension of the metal belt controlling the nip formed between the metal belt 21 and the suction roll 12.
  • a suction box 15 is arranged.
  • the web (not shown) travelling on forming wire 11 enters, coming from the left in Fig. 1 , a nip formed between the metal belt 21 and the forming wire 11, and the metal belt presses the web against the forming wire. Pressure in the nip will increase when approaching suction roll 12, in which water pressed out of the web can be rapidly removed due to a suction pressure exerted through the forming wire 11 to the web.
  • a suction box 15 is arranged immediately behind the suction roll 12, which suction box 15 applies negative pressure to the forming wire 11 to improve removal of water.
  • the web which is now pre-pressed travels further along with forming wire 11 to reach a nip formed between the forming wire and a transfer fabric of the transfer loop 4, which nip is formed at the suction transfer roll 41 of the transfer loop 4. Then, the web follows the transfer fabric of this transfer loop 4 to be transferred to subsequent sections of the paper machine.
  • the rectangle 25 drawn with dotted lines in Fig. 1 indicates a heating device provided with the metal belt 21 to heat the metal belt.
  • Heating of the metal belt 21 has basically two different possibilities; heating the metal belt to a temperature below a boiling point of the water forming the suspension liquid or heating the metal belt to a temperature above a boiling point of the suspension liquid (water) of the suspension used for the paper making.
  • the metal belt temperature is set such that the web and the water in it will be sufficiently heated but the water will not evaporate to a significant extent.
  • the viscosity of the suspension liquid will decrease. Accordingly, the suspension liquid will flow easier through the pores of the web and of course through the meshes of the forming wire, so that liquid removal can be accelerated. If the liquid removal is made easier by means of reducing viscosity of the suspension liquid, of course, with the same pressure difference a larger amount of suspension liquid can be removed within a certain time.
  • Fig. 6 there is shown a cross section through the nip formed between the metal belt 21 and the forming wire 11, wherein the metal belt 21 is arranged above the web W, which is nipped between metal belt 21 and forming wire 11.
  • the forming wire has pores or meshes 111 through which a suspension liquid 5 escapes when the web W is pressed between metal belt 21 and forming wire 11.
  • the metal belt 21 has no pores and is gas-tight. With the metal belt being sufficiently heated when contacting the wet web W, suspension liquid 5 will rapidly evaporate at its surface to form a steam cushion 6 between the web W and the metal belt 21.
  • the pressure (arrow p) of this steam cushion 6 is added to the nip pressure between the metal belt 21 and the forming wire 11, so that this pressure additionally contributes to the transport of the suspension liquid out of the web W.
  • the steam cushion 6 formed between the web and the belt contributes to separating metal belt and web, so that the web follows the further course of the forming wire 11 more easily.
  • this effect can be further supported by a coating of the metal belt 21 which avoids adhesion of the web W to the belt 21.
  • the suction box 15 arranged in the forming wire loop 1 is used to draw warm air past the web, so that a preheating of the web can be obtained, which preheating promotes web behaviour and treatability in the subsequent press section.
  • the metal belt loop 2 forming a nip with a forming wire loop 1 through which the web passes contributes to water or suspension liquid removal in the forming section of the paper machine.
  • Particular advantages obtained are a reduced nip pressure, especially in the nip with the metal belt as compared to commonly known solutions in which a press roller or an extended nip press is used for pressing the web and the forming wire therebetween. Accordingly, the lifetime of the forming wire can be improved.
  • the initial forming roll 32 and the pressure in the initial suction box 33 can be reduced.
  • the energy for driving the wire loop can be considerably reduced when replacing the high-vacuum suction boxes by the metal belt loop.
  • generation of high vacuums for high performance suction boxes is generally energy consuming, so that a reduction of the required pressure difference may directly pay-off in reduced energy costs for this paper machine.
  • Fig. 2 shows another arrangement of a paper machine forming section in which the metal belt arrangement for water removal is used. Since the basic structure of the forming section including the metal belt arrangement is the same as that of Fig. 1 , a repetition of the explanation of these parts will be omitted here. However, since the same reference signs designate the same elements, direct reference to the description of Fig. 1 can be made here with respect to these elements. Accordingly, only the differences will be explained in more detail.
  • wire loop 3 In the forming section of Fig. 2 , there is a wire loop 3 on the left hand side and a wire loop 1 on the right hand side.
  • the suspension from which the fibrous web is to be made is injected from a head box (not shown) following the direction indicated by arrow 10.
  • wire loop 3 has a further guide roll 36 instead of a suction roll.
  • wire loop 1 has a suction box 16 installed immediately behind the guide roller 14 at which the two forming wires 11 and 31 approach each other to form the area in which the initial web is formed. Passing a suction box 33 which has been described with respect to Fig.
  • the web now passes a suction and transfer roll 17 which is arranged inside wire loop 1 to guide forming wire 11 towards the metal belt arrangement 2.
  • this suction roll 17 water can be removed and the suction pressure further assures that the web follows forming wire 11 during its travel.
  • the wet web now lying on top of forming wire 11 in Fig. 2 enters the nip formed between metal belt 21 and forming wire 11.
  • the further course of the web corresponds to that described in Fig. 1 .
  • Fig. 3 shows details of a metal belt arrangement. It is noted that the same elements have the same reference signs as used in the description of the forming sections above with reference to Fig. 1 and Fig. 2 . Thus, these elements have the same functions and have been explained before.
  • the web W lying on the forming wire 11 enters a nip formed between the forming wire 11 and the metal belt 21 when these elements pass the guide roll 23.
  • the surface of the metal belt 21 is smooth and the smoothness Ra is preferably less than 6,3 ⁇ m. Furthermore, as mentioned above, the belt is impervious to fluids especially water and steam. These requirements can be fulfilled with a belt made from stainless steel plate material, which may, of course, be coated with suitable coatings. Also, surface treatments which chemically react with the steel material or which cooperate with the steel on atomic basis can be used here as well as coatings which are applied on the belt surface.
  • a suction roll 12 is arranged such that its outer diameter crosses a straight line connecting the outer diameters of guide rolls 23 and 24, that is suction roll 12 pushes the metal belt 21 into the gap between the guide rolls 23 and 24.
  • Guide roll 22 can be adjusted as is shown by the double pointed arrow drawn in guide roll 22. Adjustment of guide roll 22 controls the tension of the metal belt, so that the pressure exerted to the web and the forming wire when the metal belt presses the web can be adjusted. If needed, the metal belt is cleaned by a water shower or a doctor blade or the like (not shown).
  • the web is sandwiched between the metal belt 21 and the forming wire 11. Securing its run in the sandwiched state, the web is permanently pressed and the suspension liquid, usually water, is pressed out through the forming wire only, because the metal belt is gas-tight.
  • the smooth metal belt surface smoothes the web surface.
  • the metal belt is on another side than most of the suction boxes or suction rolls, symmetry of the paper web is improved. Additionally, due to the fact that in the (subsequent) press section typically the bottom side surface of the web is more smoothened than the top side surface, it is advantageous to smoothen the top side surface already in the forming section. As a result, a more symmetric web can finally be obtained.
  • suction roll 12 can be a suction roll having openings for water removal or it can be formed as a grooved roll which allows water removal from the forming wire 11.
  • a suction box 15 is shown arranged facing the part of the forming wire loop 1, in which the web and the forming wire are to leave the metal belt, i.e. at the point where the metal belt follows guide roll 24 while the web and the forming wire travel towards the lower guide roll 14 (see Fig. 1 and Fig. 2 ).
  • Suction box 15 provides a negative pressure onto the surface of the web facing the forming wire 11, so that suction box 15 promotes a separation of the web from the metal belt 21 and of course, travel of the web towards the transfer belt of the transfer loop 4.
  • reference sign 26 in Fig. 3 indicates a hood our housing being placed over the metal belt arrangement 2.
  • This hood is a hood isolating the metal belt against heat losses, so that a more energy saving arrangement of the heated metal belt is possible.
  • this hood 26 also contributes to an improved energy balance of a paper machine. Hot air from this hood can, if needed, be transferred to a heat exchanger or other heat consuming devices in the paper- or board machine.
  • the hood also exhibits noise reduction and safety functions and therefore further improves the forming section.
  • the hood is preferably designed such that mist and/or fiber dust generated by the forming section is prevented from entering inside the metal belt loop.
  • Fig. 4 shows some modifications at the nip formed between the metal belt and the forming wire.
  • a suction box 18 which overlaps the part where sandwiching of the wet web starts between the forming web 11 and the metal belt 21.
  • this suction box 18 is arranged to overlap the point where the metal belt 21 guided by guide roll 23 touches the web.
  • an immediate water removal peak can be observed which is then taken away by the suction box 18.
  • the suction box 18 since the suction box 18 only removes free liquid, the suction pressure can be low, so that there is no considerable increase of wear and friction losses at the suction box contacting forming wire 11.
  • a pressure or pressing arrangement 27 which can be a hydrodynamic (water and/or steam) pressing element pressing the metal belt towards the suction roll 12. Then, the pressing medium like hot water or steam advantageously transfer heat via the metal belt to the web, thereby further improving the dewatering capacity or dewatering efficiency.
  • the pressing arrangement may be a mechanical pressing element, e.g. a roll.
  • the pressure distribution in the nip can be controlled at need to obtain water removal at predetermined portions of the web travel.
  • the pressing arrangement is arranged close to or at the end of the metal belt nip.
  • a further suction box 15 is arranged to overlap the opening part of the nip, i.e. it overlaps the point where the web separates from the metal belt to stay on the forming wire 11.
  • Fig. 5 shows another modified form of the metal belt loop 2 especially at the nip formed between the metal belt and the forming wire.
  • a suction roll 12 which has a particular arrangement of its suction chamber 125 or effective suction area.
  • the suction roll chamber 125 or its respective suction area are arranged to extend substantially over the metal belt loop ensuring the web remains on the wire surface and the suction chamber also guides removed water away from the wire and the web. Together with this arrangement, the suction box 15 of Fig. 3 and 4 can be used.
  • the forming section of the invention may be applied to new paper- or board machines, and it is also possible to integrate it into existing machines in the frame of so-called rebuilds. Test have shown that in a paper machine excellent dewatering results have been obtained with the following parameters:

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Claims (14)

  1. Section de formage destinée à former une bande fibreuse (W), ladite section de formage comprenant
    une boucle de toile de formage (1) pour former la bande fibreuse (W) à partir d'une fibre contenant une suspension (10) dessus, et
    une courroie métallique (21) en boucle imperméable aux fluides qui est agencée pour presser la bande fibreuse (W) et ladite toile de formage (11) entre ladite courroie métallique (21) et une surface de support (12),
    où la toile de formage (11) est agencée pour se mettre en contact avec la surface de support (12),
    caractérisée en ce que la bande métallique (21) est agencée pour se mettre en contact avec la bande fibreuse (W).
  2. Section de formage selon la revendication 1, dans laquelle ladite bande métallique (21) est lisse, dans laquelle une valeur Ra de lissé de la courroie métallique (21) est inférieure à 6,3 µm.
  3. Section de formage selon la revendication 1 ou 2, dans laquelle la bande métallique (21) est agencée pour presser la bande fibreuse (W) par le dessus en pressant le liquide (5) de la suspension (10) vers la toile de formage (11) disposée au-dessous de la bande (W).
  4. Section de formage selon la revendication 1, 2 ou 3, dans laquelle un moyen de chauffage (25) est disposé au niveau de la boucle (2) de la courroie métallique pour chauffer la bande métallique (21).
  5. Section de formage selon l'une des revendications 1 à 4, dans laquelle la surface de support est un rouleau (12) ayant des parties de surface au niveau de laquelle un liquide (5) à partir de ladite suspension (10) quitte la toile de formage (11).
  6. Section de formage selon la revendication 5, dans laquelle, la surface de support est un rouleau à rainures ou un rouleau d'aspiration (12).
  7. Section de formage selon l'une des revendications précédentes, dans laquelle une boîte d'aspiration (15) est prévue au niveau de la toile de formage (11) et en aval de la surface de support (12), où la pression d'aspiration est réglée pour maintenir la bande (W) sur la toile de formage (11).
  8. Section de formage selon la revendication 7, dans laquelle la boîte d'aspiration (15) présente une surface courbe.
  9. Section de formage selon l'une des revendications précédentes, dans laquelle une hotte (26) est disposée au-dessus ou autour de la courroie métallique (21).
  10. Machine à papier ou à carton comprenant une section de formage selon l'une quelconque des revendications précédentes 1 à 9.
  11. Procédé destiné à former une bande fibreuse (W) à partir d'une fibre contenant une suspension (10), ledit procédé étant caractérisé par l'étape consistant à presser une bande fibreuse (W) et une toile de formage (11) entre une courroie métallique (21) en boucle imperméable aux fluides et une surface de support (12), pour presser le liquide de suspension (5) hors de la bande fibreuse (W),
    où la bande métallique (21) est agencée pour se mettre en contact avec la bande fibreuse (W) et la toile de formage (11) est agencée pour se mettre en contact avec la surface de support (12).
  12. Procédé selon la revendication 11, comprenant en outre l'étape consistant à chauffer la bande métallique (21) et à amener la bande métallique chauffée (21) en contact avec la bande fibreuse (W).
  13. Procédé selon la revendication 11 ou 12, comprenant en outre l'étape consistant à appliquer une pression d'aspiration à la toile de formage (11) au niveau de la surface de support (12) et/ou en aval de la surface de support (12).
  14. Procédé selon la revendication 12, dans lequel la bande métallique (21) est chauffée à une température inférieure au point d'ébullition du liquide de suspension (5), lorsque la bande métallique (21) se met en contact avec la bande fibreuse (W), ou dans lequel la courroie métallique (21) est chauffée à une température supérieure au point d'ébullition du liquide de suspension (5), lorsque la courroie métallique (21) se met en contact avec la bande fibreuse (W).
EP08804747A 2008-09-25 2008-09-25 Section de formation avec bande métallique Not-in-force EP2331750B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2008/062854 WO2010034346A1 (fr) 2008-09-25 2008-09-25 Section de formation à courroie métallique

Publications (2)

Publication Number Publication Date
EP2331750A1 EP2331750A1 (fr) 2011-06-15
EP2331750B1 true EP2331750B1 (fr) 2012-12-26

Family

ID=40032841

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08804747A Not-in-force EP2331750B1 (fr) 2008-09-25 2008-09-25 Section de formation avec bande métallique

Country Status (3)

Country Link
EP (1) EP2331750B1 (fr)
CN (1) CN102165117B (fr)
WO (1) WO2010034346A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI20115178L (fi) 2011-02-23 2012-08-24 Metso Paper Inc Vedenpoistolaite
CN102433792A (zh) * 2011-10-25 2012-05-02 天津科技大学 一种带式压光机保温罩

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5389205A (en) * 1990-11-23 1995-02-14 Valmet Paper Machinery, Inc. Method for dewatering of a paper web by pressing using an extended nip shoe pre-press zone on the forming wire
DE19702574A1 (de) * 1997-01-24 1998-07-30 Voith Sulzer Papiermasch Gmbh Pressenanordnung
FI20020159A (fi) * 2002-01-29 2003-07-30 Metso Paper Inc Pinnan muokkauslaite ja laitetta käyttävä menetelmä päällystetyn tai päällystämättömän kuiturainan viimeistelemiseksi
FI20035053A (fi) * 2003-04-29 2004-10-30 Metso Paper Inc Laitteisto ja menetelmä paperin tai kartongin valmistamiseksi ja näin valmistettu paperi tai kartonki
DE102004052975A1 (de) * 2004-10-29 2006-05-04 Voith Paper Patent Gmbh Doppelsiebformer zur Herstellung einer Faserstoffbahn aus mindestens einer Faserstoffsuspension

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Publication number Publication date
EP2331750A1 (fr) 2011-06-15
CN102165117A (zh) 2011-08-24
WO2010034346A1 (fr) 2010-04-01
CN102165117B (zh) 2013-10-09

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