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WO2009050335A1 - Procédé de fabrication de cylindre de tamis et cylindre de tamis - Google Patents

Procédé de fabrication de cylindre de tamis et cylindre de tamis Download PDF

Info

Publication number
WO2009050335A1
WO2009050335A1 PCT/FI2008/050573 FI2008050573W WO2009050335A1 WO 2009050335 A1 WO2009050335 A1 WO 2009050335A1 FI 2008050573 W FI2008050573 W FI 2008050573W WO 2009050335 A1 WO2009050335 A1 WO 2009050335A1
Authority
WO
WIPO (PCT)
Prior art keywords
screen
supporting
supporting bars
screen cylinder
cylinder
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
PCT/FI2008/050573
Other languages
English (en)
Inventor
Veli-Matti Rajala
Jukka Virtanen
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
Priority to DE212008000071U priority Critical patent/DE212008000071U1/de
Priority to AT0937008A priority patent/AT507934A3/de
Publication of WO2009050335A1 publication Critical patent/WO2009050335A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
    • D21D5/00—Purification of the pulp suspension by mechanical means; Apparatus therefor
    • D21D5/02—Straining or screening the pulp
    • D21D5/16—Cylinders and plates for screens
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D39/00—Filtering material for liquid or gaseous fluids
    • B01D39/10—Filter screens essentially made of metal

Definitions

  • the invention relates to a method of manufacturing a screen cylinder, the method comprising fitting screen wires forming the screen surface of the screen cylinder in connection with supporting bars of the screen cylinder, into grooves formed adjacently at predetermined intervals in the supporting bars; bending the supporting bars into a ring shape; and attaching the ends of the supporting bars bent into the ring shape together in such a way that the screen wires form a cylindrical screen surface in the direction of the axis of the screen cylinder.
  • the invention relates to a screen cylinder for purifying and screening a pulp mixture, the screen cylinder comprising screen wires which form the cylindrical screen surface of the screen cylinder and have been fitted into grooves formed at predetermined intervals in ring-shaped supporting bars of the screen cylinder.
  • Screen cylinders are used, for example, for purifying and screening a pulp mixture.
  • Screen cylinders may be manufactured for instance in such a way that parallel screen wires forming a screen surface are fitted adjacent to each other in such a way that a screen slot of a desired size remains between them. Most often this is done by forming grooves at even intervals in separate supporting bars, the screen wires being fitted into the grooves. The width of the grooves is typically some hundredth parts of a millimetre wider than the base part of the screen wires.
  • the screen wires are attached to the supporting bars by, for example, laser welding or brazing.
  • the plate-like screen panel thus formed is bent into a cylindrical shape by rolling the supporting bars into a ring shape. The ends of the supporting bars bent into the ring shape are attached together by, for example, welding.
  • special supporting hoops may be mounted to support the screen cylinder structure.
  • One screen cylinder of this type is disclosed in US publication 6 589 424, for instance.
  • the clearance may also deteriorate the mechanical durability of a screen cylinder.
  • the screen wire When examined dynamically, the screen wire is not, due to the clearance, supported against the side surface of the groove in the supporting bar but is merely supported by a laser weld. Since the screen wire is not supported against the edges of the groove in the supporting bar, the force effects occurring in the use of the screen cylinder may cause the screen wire to live relative to the weld and, in the worst case, they may finally cause the screen wire to be detached from the weld.
  • An object of this invention is to provide a new type of method for manufacturing a screen cylinder.
  • the method according to the invention is characterized by pressing the supporting bars at one of the manufacturing stages of the screen cylinder after having fitted the screen wires into the grooves of the supporting bars of the screen cylinder in order to remove the clearances between the screen wires and the grooves of the supporting bars.
  • the screen cylinder according to the invention is characterized in that the supporting bars have been pressed at one of the manufacturing stages of the screen cylinder in order to remove the clearances between the screen wires and the supporting bars.
  • screen wires forming the screen surface of the screen cylinder are fitted in connection with the supporting bars of the screen cylinder, into grooves formed adjacently at predetermined intervals in the supporting bars.
  • the supporting bars are bent into a ring shape, and the ends of the supporting bars bent into the ring shape are attached together in such a way that the screen wires form a cylindrical screen surface in the direction of the screen cylinder axis.
  • the supporting bars are pressed to remove the clearances between the screen wires and the grooves of the supporting bars.
  • the supporting bars are pressed inwards in the direction of the screen cylinder radius after the ends of the supporting bars bent into a ring shape have been attached together and a cylindrical screen cylinder structure has been provided.
  • a pressing arrangement is easily implementable, because when pressed as a ring, the structure is not particularly susceptible to buckling. Further, the possible buckling tendency is primarily directed only to the inside of the screen cylinder, which is easily preventable.
  • the attaching point between the ends of the supporting bars can thus be made similar to the rest of the supporting ring with regard to the roundness, strength and other properties.
  • the ends of the supporting bars are pressed together before bending the supporting bars into a ring shape. Pressing the supporting bars when they are straight allows manufacturing screen panels of screen cylinders of different sizes with simple arrangements because it is easy to arrange support structures of different sizes as a plane structure. On the other hand, large screen panels can be manufactured, out of which smaller screen panels may be mechanically worked to serve correspondingly as preforms of screen cylinders of different sizes.
  • Figure 1 shows schematically a cross-section of the basic structure of a screen cylinder, seen from the direction of the screen cylinder axis;
  • Figure 2 shows schematically the screen cylinder according to Figure 1 , cross-sectioned in the direction of the screen cylinder axis;
  • Figure 3 shows schematically the structure of a possible joint between the screen wire and the supporting bar of the screen cylinder according to Figures 1 and 2, seen from the end of the screen wire;
  • Figure 4 shows schematically an arrangement for manufacturing a screen cylinder, seen from the screen cylinder axis
  • Figure 5 shows schematically a side view and a partial cross-section of a second arrangement for manufacturing a screen cylinder
  • Figure 6 shows schematically a top view of the arrangement according to Figure 5 for manufacturing a screen cylinder.
  • Figure 1 shows schematically a cross-section of a screen cylinder 1 , seen from the direction of the screen cylinder axis;
  • Figure 2 shows schematically the screen cylinder 1 according to Figure 1 , cross-sectioned in the direction of the screen cylinder axis;
  • Figure 3 shows schematically the structure of a possible joint between the screen wire and the supporting bar of the screen cylinder, seen from the end of the screen wire.
  • Around the whole inner periphery of the screen cylinder 1 there are screen wires 2 forming the screen surface of the screen cylinder 1.
  • FIG. 1 shows arrow R to indicate the radius of the screen cylinder 1.
  • ends 4' and 4" of the supporting bars 4 have been attached together by welding at an attaching point 4a in such a way that the supporting bars 4 form a ring-like structure.
  • One example of a typical screen cylinder is one having a diameter of 1 ,000 mm, the screen wire width of 4 mm and the screen slot width of 0.25 mm, whereby the number of screen wires in the screen cylinder is 739.
  • the supporting bars 4 On the inner surface of the supporting bars 4, i.e. on the surface directed towards the inside of the screen cylinder 1 , there are fitting grooves 5 or attaching grooves 5 or grooves 5 of the screen wires 2, into which the screen wires 2 are fitted.
  • the grooves 5 have been made in the supporting bars 4 in the direction transverse to their longitudinal direction, and they have a first edge 5', a second edge 5" and a bottom 5'".
  • the screen wire 2 may be fitted in the groove 5 in such a way that the screen wire 2 is not specially attached to the groove 5 but that between the screen wire 2 and the groove 5, a pressing effect or shape locking which attaches the screen wire 2 to the groove
  • the screen wires 2 are fitted into the grooves 5 of the supporting bars 4, the screen wires 2 may also be specially attached to the groove 5, for example by welding, such as laser welding or soldering, such as brazing or gluing the screen wire 2 by its base 2' to the bottom 5'" of the groove 5, which ensures that the screen wires 2 are not detached from the grooves 5 during the later manufacturing stages of the screen cylinder 1.
  • Figure 3 does not show this attachment in greater detail.
  • FIG. 3 shows the screen cylinder 1 in a situation where these clearances have already been removed at one of the manufacturing stages of the screen cylinder 1 , for example in exemplary manners of manufacturing a screen cylinder, presented in the following.
  • Figures 1 and 2 further show schematically supporting hoops
  • the supporting hoops 6 arranged around the supporting bars 4, the purpose of which is to support the structure of the screen cylinder 1.
  • the supporting hoops 6 can be arranged either around all supporting bars 4 of the screen cylinder 1 or around only some of the supporting bars 4.
  • Figure 4 shows schematically from the direction of the axis of the screen cylinder 1 a method and an arrangement where the clearances be- tween the screen wires 2 and the grooves 5 of the supporting bars 4 are removed from the screen cylinder 1 after having bent the supporting bars 4 into a ring shape and having attached the ends 4 1 and 4" of the supporting bars 4 bent into the ring shape together by welding, for example.
  • means are arranged around each supporting bar 4 to press the supporting bar 4.
  • these means comprise a roller chain 7 having rollers 8 arranged as a chain.
  • the means comprise a hydraulic cylinder 9, a first end T of the roller chain 7 being attached to its fixed end 10 and a second end 7" of the roller chain 7 being attached to its moving end 11 , i.e. piston.
  • pumping of pressure fluid into hydraulic cylinders 13 begins via an operating unit 12 and required hoses 13, 14 in such a way that the pistons of the hydraulic cylinders start moving inwards into the hydraulic cylinders 9.
  • Each hydraulic cylinder 9 may have an operating unit 12 of its own, or all hydraulic cylinders may have one common operating unit 12.
  • the roller chain 7 begins to tighten around the supporting bar 4 and press the supporting bar 4 in the direction of the radius of the screen cylinder 1 in such a way that the clearances between the screen wires 2 and the grooves of the supporting bar 4 begin to disappear or become smaller, as a result of which the diameter of the screen cylinder 1 becomes slightly smaller.
  • the rolling friction of the rollers 8 of the roller chain 7 allows the pressing force caused by the roller chain 7 to be evenly distributed around the screen cylinder 1. Substantially the same pressure can be pumped substantially simultaneously to all hydraulic cylinders 14 in such a way that all supporting bars 4 are subjected to the same kind of pressing effect substantially simultaneously.
  • the interior of the screen cylinder 1 may, for the duration of the shrinking of the screen cylinder 1 , be provided with a cylinder which does not restrict the diameter of the screen cylinder 1 but the purpose of which is to prevent the screen cylinder 1 from buckling inwards.
  • the pressure of the hydraulic cylinders 9 is raised so high that after depressurization there are no clearances between the screen wires 2 and the supporting bars 4. Acceleration of the increase in the hydraulic pressure indicates that the clearances between the screen wires 2 and the edges 5', 5" of the grooves 5 have been disappeared completely, in other words the edges 5' and 5" of the grooves 5 have become attached to the bases 2 1 of the screen wires 2. Pressing can be continued until the supporting bar 4 and the screen wire portion fitted into the groove 5 of the supporting bar 4 become in practice completely plasticized in the pressing. The plasticized material may, due to the stopping of the plasticizing pressing, be recovered by the amount of the elastic deformation.
  • the structure of the screen cylinder is nearly strain-free. Due to the elastic recovery of the portion of the screen wire 2 having remained outside the pressing, which may be smaller than the recovery of the plasticized material, there may remain a small clearance between the screen wire 2 and the supporting bar 4 nearest the unpressed portion of the screen wire 2 in the joint of the supporting bar 4 and the screen wire 2. This clearance disappears, however, after the supporting hoop 6 has been compressed around the supporting bar 4.
  • the supporting hoops 6 are arranged around the supporting bars 4 after the pressing of the supporting bars 4 in such a way that a compression joint is formed between the supporting bars 4 and the supporting hoops 6, whereby a firm, clearance-free joint is formed between the screen wires 2 and the supporting bars 4.
  • the joint between the screen wires 2 and the supporting bars 4, formed in this way, has a multiple static and particularly dynamic weight- carrying capacity as compared with previous pressure joints where clearances have not been removed in accordance with the presented solution. Disappearance of the clearances between the screen wires 2 and the supporting bars 4 can be checked visually by utilizing a device provided with 10-fold magnification, for instance.
  • the shrinking need is 739 times 0.03 mm, i.e. 22.17 mm, in order for the clearances to close. In the diameter of the screen cylinder 1 , this means a shrinking need of about 7 mm.
  • the means used for shrinking the screen cylinder 1 are dismounted.
  • the ring-shaped supporting hoops 6 mentioned above are mounted around one or more supporting bars 4 of the screen cylinder 1 by forming a compression joint between the supporting bars 4 and the supporting hoops 6.
  • the supporting hoops 6 are mounted around the supporting bars 6 in such a way that the supporting hoops 6 are first heated, as a result of which the supporting hoops 6 expand in such a way that the diameter of the supporting hoops 6 increases. After the heating, the supporting hoops 6 are mounted around the supporting bars 4. After this, when cooling, the supporting hoops 6 shrink in such a way that the supporting hoops 6 are pressed around the supporting bars 4.
  • the supporting hoops 6 When being pressed around the supporting bars 4, the supporting hoops 6 also simultaneously remove the small clearances caused by the possible recovery of the supporting bars 4 when the pressing has been stopped before the supporting bar 4 and the portion of the screen wire 2 fitted in the groove 5 of the supporting bar 4 have been plasticized in the area of the joint between the supporting bar 4 and the screen wire 2.
  • the pressing has been continued so long that the supporting bar 4 and the portion of the screen wire 2 fitted into the groove 5 of the supporting bar 4 have been plasticized, clearances are no longer generated after the pressing because after the plasticizing pressing the plasticized supporting bar 4 and the plasticized portion of the screen wire 2 recover equally much and the structure of the screen cylinder 1 remains, as mentioned above, nearly strain-free.
  • the compression joint between the supporting bars 4 and the supporting hoops 6 also contributes to the uniformity of the joint 4a between the ends of the supporting bars 4 with the other part of the supporting bars 4.
  • roller chains, hydraulic cylinders and devices required for using hydraulic cylinders are used for removing the clearances but it is obvious that also other appropriate means may be used for removing the clearances by shrinking the screen cylinder 1.
  • Figures 5 and 6 show schematically a second method and arrangement for removing the clearances between the screen wires 2 and the grooves 5 of the supporting bars 4 from the screen cylinder.
  • a screen panel being the first stage of the screen cylinder 1 , formed of the supporting bars 4 and screen wires 2 attached to them, is shown as a side view in Figure 5, seen from the point of section A-A of Figure 6, and as a top view in Figure 6, before the supporting bars 4 have been bent into a ring shape.
  • the screen panel has been positioned on a pressing base 15.
  • the arrangement according to Figures 5 and 6 further comprises hydraulic cylinders 16 and a rear counterpart 17 of the pressing base 15, against which one end of the screen panel is arranged, and a front counterpart 18 of the pressing base 15, against which the fixed ends of the hydraulic cylinders 16 are arranged.
  • the arrangement further comprises an intermediate beam 19, which is positioned between the screen panel and the hydraulic cylinders 16 in such a way that pistons 20 of the hydraulic cylinders 16 have been attached either fixedly or detachably to the intermediate beam 19.
  • the length of the supporting bars 4 is reduced by the amount of the clearances being removed.
  • the pressure needed for pressing begins to increase greatly, whereby the pressing can be stopped.
  • the pressing can, however, be continued until the pressing pressure does not increase any longer although the pressing continues, whereby what is called a pressing- displacement curve has turned horizontal, meaning that the material loaded with the pressing has been completely plasticized.
  • the supporting bar 4 and the portion of the screen wire 2 fitted into the groove 5 of the supporting bar 4 have thus been plasticized in the area of the joint between the supporting bar 4 and the screen wire 2. Continuing the pressing until this plas- ticization takes place ensures complete removal of the clearances.
  • the plasticized material may recover by the amount of elastic deformation. Due to the elastic recovery of that portion of the screen wire 2 which has remained outside the pressing, which elastic recovery may be smaller than the recovery of the plasticized material, there may remain a small clearance between the screen wire 2 and the supporting bar 4 closest to the unpressed portion of the screen wire 2 in the joint of the supporting bar 4 and the screen wire 2. This clearance is, however, removed when the supporting bars 4 are bent into a ring shape to form the cylinder structure of the screen cylinder or when a supporting hoop 6 is placed around the supporting bar 4. After the pressing has been stopped, the screen panel can be removed from the base and bent into a screen cylinder shape, and the supporting hoops 6 can be mounted in the above- mentioned manner around at least some of the supporting bars 4.
  • the arrangement may be provided with supports 21 against sideward buckling which support the screen cylinder on both sides and which may also be arranged in such a way that they support each supporting bar 4 separately to avoid the buckling of the supporting bars 4. Further, the arrangement may be provided with supports 22 against buckling in the direction of the panel plane, supporting the panel both from above and from below.
  • the screen panel has, in total, five supporting bars 4, and the pressing base comprises equally many hydraulic cylinders, i.e. one hydraulic cylinder at each supporting bar 4.
  • hydraulic cylinders are not necessarily needed at each supporting bar but, when manufacturing a sufficiently rigid intermediate beam, there may be for example two cylinders or for wide screen panels three or more cylinders.
  • the grooves 5 for the screen wires 2, to be arranged in the supporting bars 4 can be machined as a separate batch for each screen cylinder, in other words to all supporting bars 4 in one go in such a way that the supporting bars 4 of the required batch are mounted at the same time adjacently on a machining fastener. Further, the supporting bars 4 may be mounted on the screen cylinder in the same direction as how they are in the machining.
  • the manufacturing method enables manufacturing of almost completely identical pieces with regard to the groove widths and the distribution of the grooves. Due to the manufacturing method of the screen wires, the start and the end of an individual screen wire are also almost completely identical.
  • Such an arrangement allows the supporting bars to be pressed evenly.
  • the pressing is well applicable to manufacturing screen cylinders of all sizes but the best result is achieved when the profile of the supporting bar 4, i.e. the height of the supporting bar 4 in the longitudinal direction of the screen wire 2, is restricted in such a way that it is preferably at most 16 millimetres, more preferably at most 12 millimetres and most preferably at most 10 millimetres, because with greater heights of the supporting bar 4 the forces needed for bending the supporting bars 4 in connection with rolling into a cylinder are too great when directed at the screen wires, which causes detrimental deformation in the screen wires.
  • FIG 2 shows schematically how supporting hoops 6 have been arranged around the supporting bars 4, the purpose of the supporting hoops being to support the structure of the screen cylinder 1.
  • the side of the supporting bars 4 which is directed outwards from the screen cylinder 1 has a welding groove 23 parallel to the supporting bar 4 and extending around the whole supporting bar 4, whereby the supporting bar 4 has a cross-section which substantially resembles letter U.
  • the screen wires 2 and the supporting bars 4 can be welded together in the above-mentioned manner, which contributes to increasing the weight-carrying capacity between the screen wires 2 and the supporting bars 4.
  • flexible material may be placed in the welding groove 23, for instance in the manner shown at the top of Figure 2, where an O-ring 24 made of rubber has been placed in the groove, the diameter of the ring being dimensioned such that the supporting hoop 6 presses it, in other words compressive stress is transmitted via the O-ring to the space between the supporting bar 4 and the supporting hoop 6.
  • This O-ring evens out stresses and, in addition, attenuates vibrations, increasing thus the service life of the screen cylinder.
  • a hollow space remaining between the U-shaped supporting bar 4 and the supporting hoop 6 may be filled with a high-viscosity flexible material 25, which can be extruded into this empty space at a desired pressure via one or more conduits 26 formed in this supporting hoop 6, the conduit being shown schematically at the bottom of Figure 2.
  • the high-viscosity flexible material may be, for example, some type of plastic, which cures when cooling down and leaves the supporting hoop 6 tight. If the viscosity of this material is high, no special tightening between the supporting hoop 6 and the supporting bar 4 is needed.
  • the material may also be swelling, whereby, when expanding in the closed space after the extrusion, it tightens the supporting hoop 6 around the supporting bar 4.
  • the above-mentioned great contact force is based on a state of great tensile stress being generated on the outer periphery of the supporting bar 4 as a result of the bending, compared with a case where supporting bars 4 are pressed in the direction of the periphery after the supporting bars 4 have been bent into a ring shape, whereby the plasticizing of the pressing stage removes stresses from the structure of the screen cylinder in such a way that after the pressing only a small compressive stress remains in the fitting grooves 5 between the screen wires 2 and the supporting rings 4 due to the elastic recovery of the portion of the screen wire 2 remaining outside the pressing, and correspondingly, a small tensile stress remains in the supporting bar 4.
  • features described in this application may be used as such, irrespective of other features.
  • features described in this application may be, if required, combined to form different combinations.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Paper (AREA)
  • Wire Processing (AREA)

Abstract

L'invention concerne la fabrication d'un cylindre de tamis (1), et un cylindre de tamis. Des fils de tamis (2) formant la surface de tamis dudit cylindre(1) sont disposés en liaison avec des barres de support (4) de celui-ci, dans des rainures (5) formées de façon adjacente à des intervalles prédéterminés dans les barres de support (4). Lesdites barres (4) sont courbées sous une forme annulaire, et des extrémités (4\4') des barres de support (4) courbées sous la forme annulaire sont fixées les unes aux autres de telle sorte que les fils de tamis (2) forment une surface de tamis cylindrique dans la direction de l'axe du cylindre de tamis (1). Les barres de support (4) sont pressées lors de l'une des étapes de fabrication du cylindre de tamis (1) afin d'éliminer les espacements entre les fils de tamis (2) et les rainures (5) des barres de support (4).
PCT/FI2008/050573 2007-10-19 2008-10-15 Procédé de fabrication de cylindre de tamis et cylindre de tamis Ceased WO2009050335A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE212008000071U DE212008000071U1 (de) 2007-10-19 2008-10-15 Siebzylinder
AT0937008A AT507934A3 (de) 2007-10-19 2008-10-15 Siebzylinder

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI20075743A FI20075743A7 (fi) 2007-10-19 2007-10-19 Menetelmä sihtisylinterin valmistamiseksi ja sihtisylinteri
FI20075743 2007-10-19

Publications (1)

Publication Number Publication Date
WO2009050335A1 true WO2009050335A1 (fr) 2009-04-23

Family

ID=38656888

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI2008/050573 Ceased WO2009050335A1 (fr) 2007-10-19 2008-10-15 Procédé de fabrication de cylindre de tamis et cylindre de tamis

Country Status (4)

Country Link
AT (1) AT507934A3 (fr)
DE (1) DE212008000071U1 (fr)
FI (1) FI20075743A7 (fr)
WO (1) WO2009050335A1 (fr)

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5503323A (en) * 1993-04-21 1996-04-02 Kvaerner Pulping Technologies Ab Screening means with a screening body, and method and device for manufacturing the screening body
US5595307A (en) * 1994-09-27 1997-01-21 Valmet Corporation Method of making a screen cylinder, and a screen cylinder
US6131743A (en) * 1997-06-18 2000-10-17 Hermann Finckh Maschinenfabrik Gmbh & Co. Screen basket for fiber suspensions and method for the production thereof
DE10045454A1 (de) * 2000-08-01 2002-02-14 Voith Paper Patent Gmbh Siebvorrichtung zum Nasssieben von Faserstoffsuspensionen in Drucksortierern
US6589424B1 (en) * 1997-10-29 2003-07-08 Metso Paper, Inc. Method of making screen cylinder and screen cylinder
WO2005019529A1 (fr) * 2003-08-22 2005-03-03 Metso Paper Inc Procede permettant de produire un cylindre de tamis et cylindre de tamis
WO2006008332A2 (fr) * 2004-07-16 2006-01-26 Advanced Fiber Technologies (Aft) Trust Procede permettant de fabriquer un cylindre de tamis, et cylindre de tamis ainsi obtenu
WO2006119614A1 (fr) * 2005-05-09 2006-11-16 Hetu Marc-Andre Panier de tamis à barres profilées remplaçables
US20070220942A1 (en) * 2006-02-22 2007-09-27 Voith Patent Gmbh Method for producing a rotationally symmetrical, in particular cylindrical screening device

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5503323A (en) * 1993-04-21 1996-04-02 Kvaerner Pulping Technologies Ab Screening means with a screening body, and method and device for manufacturing the screening body
US5595307A (en) * 1994-09-27 1997-01-21 Valmet Corporation Method of making a screen cylinder, and a screen cylinder
US6131743A (en) * 1997-06-18 2000-10-17 Hermann Finckh Maschinenfabrik Gmbh & Co. Screen basket for fiber suspensions and method for the production thereof
US6589424B1 (en) * 1997-10-29 2003-07-08 Metso Paper, Inc. Method of making screen cylinder and screen cylinder
DE10045454A1 (de) * 2000-08-01 2002-02-14 Voith Paper Patent Gmbh Siebvorrichtung zum Nasssieben von Faserstoffsuspensionen in Drucksortierern
WO2005019529A1 (fr) * 2003-08-22 2005-03-03 Metso Paper Inc Procede permettant de produire un cylindre de tamis et cylindre de tamis
WO2006008332A2 (fr) * 2004-07-16 2006-01-26 Advanced Fiber Technologies (Aft) Trust Procede permettant de fabriquer un cylindre de tamis, et cylindre de tamis ainsi obtenu
WO2006119614A1 (fr) * 2005-05-09 2006-11-16 Hetu Marc-Andre Panier de tamis à barres profilées remplaçables
US20070220942A1 (en) * 2006-02-22 2007-09-27 Voith Patent Gmbh Method for producing a rotationally symmetrical, in particular cylindrical screening device

Also Published As

Publication number Publication date
AT507934A3 (de) 2011-03-15
FI20075743L (fi) 2009-04-20
DE212008000071U1 (de) 2010-06-24
FI20075743A0 (fi) 2007-10-19
AT507934A2 (de) 2010-09-15
FI20075743A7 (fi) 2009-04-20

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