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EP0905309B1 - Tamis et appareil de tamisage sous pression pour suspensions fibreuses - Google Patents

Tamis et appareil de tamisage sous pression pour suspensions fibreuses Download PDF

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Publication number
EP0905309B1
EP0905309B1 EP98122514A EP98122514A EP0905309B1 EP 0905309 B1 EP0905309 B1 EP 0905309B1 EP 98122514 A EP98122514 A EP 98122514A EP 98122514 A EP98122514 A EP 98122514A EP 0905309 B1 EP0905309 B1 EP 0905309B1
Authority
EP
European Patent Office
Prior art keywords
screen
approximately
sieve
grooves
axis
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
EP98122514A
Other languages
German (de)
English (en)
Other versions
EP0905309A3 (fr
EP0905309A2 (fr
Inventor
Jochen Gustav Pfeffer
Erich Czerwoniak
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.)
Voith Finckh Fiber Systems GmbH and Co KG
Original Assignee
Hermann Finckh Maschinenfabrik GmbH and Co
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 Hermann Finckh Maschinenfabrik GmbH and Co filed Critical Hermann Finckh Maschinenfabrik GmbH and Co
Priority to EP95907639A priority Critical patent/EP0805890B1/fr
Priority to DE59509890T priority patent/DE59509890D1/de
Priority to AT98122514T priority patent/ATE209721T1/de
Priority to EP98122514A priority patent/EP0905309B1/fr
Priority claimed from EP95907639A external-priority patent/EP0805890B1/fr
Publication of EP0905309A2 publication Critical patent/EP0905309A2/fr
Publication of EP0905309A3 publication Critical patent/EP0905309A3/fr
Application granted granted Critical
Publication of EP0905309B1 publication Critical patent/EP0905309B1/fr
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
    • 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
    • D21D5/023—Stationary screen-drums
    • D21D5/026—Stationary screen-drums with rotating cleaning foils
    • 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

Definitions

  • the invention relates to a sieve according to the preamble of the claim 1 and a pressure sorter according to the preamble of Claim 28.
  • the invention relates to such screens, at which the upstream grooves and the sieve passage channels in a screen wall that is rotationally symmetrical to the screen axis from one stainless steel sheet are formed, or such pressure sorters, as described in WO 94/00634 from Hermann Finckh Maschinenfabrik GmbH & Co. reveals and claims become.
  • a sieve with the features of the preamble of claim 1 can be seen from Figures 14 to 16 of EP-A-0 205 623. How 14 of this document, the upstream grooves continuously over the entire axial length the effective part of the sieve, and each of these grooves are assigned several sieve passage channels, which as in Slits extending in the direction of the sieve axis are formed are successive in the direction of the sieve axis and in this direction are spaced from each other.
  • the Profile of the upstream grooves is designed so that the in Direction of rotation of the fiber suspension to be sorted at the front horizontal groove side wall - on average perpendicular to the sieve axis - forms an angle of 90 ° with the circumferential direction of the sieve and the two groove side walls form an angle with each other of approximately Form 135 °.
  • the width measured in the direction of the wire circumference the non-profiled and parallel to the wire circumferential direction running surface areas of the sieve between the in Sieve circumferential direction of successive grooves is clear larger than that on the upstream side of the sieve as well Width of the grooves measured in the circumferential direction of the sieve.
  • the two Groove side walls are opposite to the screen circumferential direction, respectively inclined at an angle of 45 ° so that they join together Form an angle of 90 °.
  • the groove depth is 1 mm, the in The groove width measured as a result of this is 2 mm.
  • Fiber suspension generated turbulence due to the grooves; by which is prevented from being on the upstream side of the sieve reducing the throughput of the pressure sorter Can form nonwoven, which is also useful Fibers would be retained.
  • sufficiently strong turbulence requires a certain amount Minimum depth of said grooves.
  • Fiber suspension causes the first, front groove side walls; these generate mainly in the circumferential direction because of the rotor of the sieve flowing along its upstream side, Fiber suspension still to be sorted in the area of the respective front groove side wall a negative pressure, the greater is, the steeper this front groove side wall is, d. H.
  • this abrasive wear on the upstream side of the screen also advantageous if on the upstream side between the Grooves flat and parallel to the screen circumferential surface areas be provided because if the grooves in would directly adjoin the circumferential direction of the screen, would result in acute angles (on average perpendicular to the sieve axis) Contours between the rear groove side wall and the front groove side wall of two successive grooves, what contours from the abrasive components of the fiber suspension would be sanded down quickly, that the groove depth decreases rapidly and the turbulence rapidly would weaken.
  • the invention was based on the task of a sieve has upstream turbulence-generating grooves, or to create a pressure sorter with such a sieve which has a higher throughput than with the above known sieves or pressure sorters described with such Seven can be achieved without including his Wear behavior dependent durability or service life of the sieve.
  • This task can be done according to the invention with a sieve Solve claim 1 or a pressure sorter according to claim 25.
  • a pressure sorter screen with upstream, facing of the sieve axis extending grooves and sieve passage channels in The form of bores results from EP-B-0 456 788 Hermann Finckh Maschinenfabrik GmbH & Co. But also at this known strainer has each of the upstream grooves Section perpendicular to the sieve axis, a V-shaped cross-section, whose bisector is radial with respect to the sieve axis, with the two groove side walls one between them Include an angle of approx. 120 ° so that this sieve can also be used the above statements on the other known sieve of Hermann Finckh Maschinenfabrik GmbH & Co. apply.
  • the sieve resulting from EP-B-0 456 788 opens into each of the upstream grooves a plurality of sieve passage channels (Holes) in the direction of the sieve axis at a distance from each other are arranged and each in one on the outflow side of the sieve provided opening, which the shape a frustoconical (in plan view of the downstream side of the sieve circular) countersink.
  • Holes sieve passage channels
  • EP-A-0 521 192 discloses a cylindrical sieve for sorting of fiber suspensions become known, the screen wall has recesses on the upstream side of the sieve, in the each has a plate-shaped sieve insert, which a series of perpendicular to the platelet plane Has holes; these holes form the fineness of sorting determining sieve passage channels, and to each upstream
  • One recess belongs from the downstream side of the Siebs forth in the sieve wall made hole, the axis runs perpendicular to the screen wall and its diameter is so large is dimensioned that all holes of the sieve insert in this Hole.
  • the recesses in which the sieve inserts are used when looking at the screen wall in the direction either circular or perpendicular to the sieve axis a rectangular shape, the longitudinal direction being rectangular Recesses in the circumferential direction of the screen or in the direction of Sieve axis can run (see Fig. 6).
  • the embodiment shown in EP-A-0 521 192 forms the Plane-shaped sieve insert plane with the circumferential direction of the sieve an acute angle of 25 ° to 45 °, and rectangular Recesses and thus rectangular sieve inserts form the flanks of the upstream side in the upstream direction Recesses with a circumferential direction Angles from 45 ° to 65 °.
  • the properties of the sieve according to the invention with regard to the achievable throughput and its operating behavior can be improved more and more, the more the inclination the front groove side wall opposite the wire circumferential direction approximately an angle of approximately 52 ° or approximately 53 ° and an optimum results at an angle of inclination of 52.5 °, especially when the sieve passage is exact flows into the bottom of the groove and flows radially with respect to the sieve axis becomes.
  • an optimal value of the groove depth is approximately 1 mm.
  • the upstream grooves with any known Machining technology could be produced, e.g. B. in that the metal in the area of the grooves to be produced by means of an energy beam (laser or electron beam) is evaporated (the sieve passage channels could also be such energy beam are produced), it is recommended at the current state of the art, for reasons of manufacturing costs and the precision of those to be generated in the screen wall Contours the grooves as created by machining Form wells, so that they are particularly means a milling cutter.
  • an energy beam laser or electron beam
  • the screen wall of a steel sheet is produced for the screen wall - outside of the upstream side with screen openings connecting the outflow side - a wall thickness of about 6 mm to about 10 mm and in particular from about 6 mm to about 8 mm.
  • the sieve passage channels were also used as Slits drawn; in the sieve according to the invention however, they have the shape of bores, with Fig. 9 on such a sieve applies when the Sieb thoroughlyloukanäle on Because of the grooves that end according to FIG. 9 of stretch into the sieve wall below.
  • a motor 18 standing on a frame 16 which is is a three-phase or 3-phase AC motor, which by means of a pulley 20 and V-belt 22 a Pulley 24 drives which on a in the frame 16th and the housing 14 rotatably mounted rotor shaft 26 is.
  • the housing 14 essentially consists of one according to FIG. 1 left end wall 28, a circular cylindrical, concentric to the rotor shaft 26 arranged casing 30 and a Housing cover 32, which are connected together pressure-tight are.
  • An axis of the pressure sorter, which is also the axis the rotor shaft 26 is designated 34.
  • the rotor shaft guided through the end wall 28 in a pressure-tight manner 26 carries a rotor designated as a whole by 36, which can be driven about the axis 34 by means of the rotor shaft 26 is and of a circular cylindrical, concentric to the axis 34 Sieve 38 is surrounded, the two on the housing jacket 30 attached annular housing elements 40 and 42 is attached and held by these housing rings becomes.
  • the axial length is (in the direction of the axis 34) of the rotor 36 equal to the axial Length of the effective area of the screen 38 between the housing rings 40 and 42. It would also be possible to achieve certain effects, the axial length of the rotor 36 larger or less than the axial length of the sieve 38.
  • the housing 14 At the right end of the housing 14 according to FIG. 1 there is an inlet connection 46 provided by - as indicated by the arrow F. -
  • the fiber suspension to be processed or sorted is promoted in the pressure sorter, namely by means of a pump, not shown.
  • the outlet connection 48 on the housing jacket 30 attached, through which the so-called accept material - as by the Arrow A indicated - leaves the pressure sorter. With the accepted material is that part of the fiber suspension which has passed the sieve 38.
  • the housing shell 30 At the left end according to FIG. 1 the housing shell 30 is finally a second outlet port 50 attached, through which the so-called rejects - as indicated in Fig. 2 by the arrow R - the pressure sorter leaves; the reject is the one Part of the fiber suspension to be processed, which the sieve 38 cannot pass.
  • inlet space 54 namely the fiber suspension to be sorted enters via first axial end 54a of this inlet space in the latter on.
  • the axis 34 extends at least approximately horizontally, but in principle it would also be conceivable that Set up the sorter so that its axis 34 at least runs approximately vertically.
  • a measuring device 60 which comprises a first pressure transmitter 62 and a second pressure transmitter 64, which are arranged in the inlet connector 46 and in the first outlet connector 48, but also also in the inlet chamber 52 or in the accept material chamber 58 could be.
  • a difference former 74 which delivers at its output a control signal proportional to the pressure difference, which is applied via line 76 to the control input of a frequency converter 78.
  • This is fed from a current source, not shown, with a 3-phase alternating current or three-phase current of frequency f 1 and supplies a three-phase current of frequency f 2 for driving three-phase motor 18, frequency f 2 being a function of the control signal generated by difference generator 74.
  • the rotor 36 is driven at a speed which is a function of this control signal and thus the pressure difference between the inlet space 54 and the accept material space 58.
  • potentiometers or other adjusting elements could also be provided in the lines 66 and 68, with which the signals supplied by the pressure transmitters 62 and 64 could be changed, so as to make the dependence on the line 76 possible To be able to influence the control signal from the pressure difference mentioned.
  • a hub 80 which is fixedly connected to the rotor shaft 26 carries a closed, hollow circular cylindrical rotor body 82 with a circular cylindrical rotor shell 84.
  • This has a first axial end 84a at the first axial end 54a of the inlet space 54 and a second axial end 84b at the second axial end 54b of the inlet space and carries two sets outside of profile elements, namely a first set, which of Profile elements 86a, 86b, 86c and 86d is formed, as well a second set, formed by profile elements 88a, 88b, 88c and 88d.
  • the first set of profile elements forms one itself in the rotor circumferential direction or direction of rotation U des Rotor's first row of profile elements and in between arranged gaps 86a ', 86b', 86c 'and 86d', and this row defines a first axial rotor section 90, which faces the inlet space 52;
  • the second set of Profile elements 88a-88d form a second, just the same Row of profile elements and gaps arranged between them 88a ', 88b', 88c 'and 88d', and this second row defines a second axial rotor section 92 which is the reject space 56 is adjacent.
  • all profile elements are of equal height (in Direction of the axis 34 measured), depending on the desired sorting result and / or depending on the type of sorting fiber suspension, however, could be appropriate be to choose the height of the first row larger or smaller than the height of the second row. It can also be useful be to provide the rotor with more than two such rows.
  • each profile element one lying in the direction of rotation U at the front End face or first flank I, which is perpendicular to the circular cylindrical Outer peripheral surface of the rotor shell 84 and thus to the area in front of it in the direction of rotation U. Gap runs, as well as a directly on the first edge I. subsequent back surface or second flank II, which against the direction of rotation U in the radial direction to the inside and thus to the axis 34, so that the Profile elements in cross section perpendicular to axis 34 which have a very acute triangle equal, which was bent concentrically to axis 34.
  • first flanks I become strong positive in the inlet area 54 Pressure surges and strong turbulence are generated, also with the first flanks I the fiber suspension in the inlet space 54 greatly accelerated, at most up to the rotational speed of the profile elements.
  • Particularly strong Turbulence occurs in the inlet space 54 as a result of the in Direction of rotation U directed flow component of the Fiber suspension when the inside of the screen 38 according to the invention formed "rough", i.e. is profiled.
  • the first flanks I do not run parallel to the axis 34, but form an acute angle a with the direction of the axis 34, specifically the flanks I are inclined with respect to the direction of the axis 34, so that the direction
  • the flow component of the fiber suspension running along the axis 34 is amplified in the inlet space 54 in the direction from the first axial end 54a of the inlet space to its second axial end 54b.
  • the profile elements 86a-86d of the first row - measured in the rotor circumferential direction or direction of rotation U - are shorter than the profile elements 88a-88d of the second row.
  • This measure serves the purpose of adapting the effect of the profile elements to the different consistency of the fiber suspension, the consistency of which increases in the inlet space 54 from its first end 54a to its second end 54b.
  • each of the profile elements 86a-86d of the first row extends over a circumferential angle of 45 ° (this is the maximum length L 1 of the profile elements), the length of the profile elements to the second axial end 84b of the
  • Rotor jacket 84 decreases because the first flanks I run obliquely to the direction of the axis 34, while the rear edges of the second flanks II are aligned parallel to the axis 34.
  • the smallest length L 1 'of the gaps 86a' - 86d 'of the first row is also 45 ° and is therefore equal to the greatest length L 1 of the profile elements of this row, the length of the gaps in the direction of the second axial end 84b of the rotor shell 84 increases.
  • the maximum length L 2 of the profile elements 88a-88d of the second row is 53 ° in this embodiment; since the number of profile elements of the second row is equal to the number of profile elements of the first row, the minimum length L 2 'of the gaps 88a' - 88d 'of the second row results in a lower value of 37 ° here.
  • the profile elements 88a-88d of the second row and thus their gaps are offset relative to the profile elements of the first row or their gaps against the direction of rotation U, the size of the offset thus being based on the lengths of the profile elements or the gaps are coordinated so that adjacent gaps of the two rows in the axial direction overlap in the direction of rotation U or in the rotor circumferential direction to such an extent that they form a continuous channel in the axial direction which extends from one axial end 84a of the rotor shell 84 to whose other axial end 84b extends.
  • the inside width L 3 of this channel is 25 °, the inside width being understood as the width which the observer sees in the direction of the axis 34 when the rotor is viewed from the front.
  • the Lengths of the profile elements of the first row are approximately equal to the lengths of the gaps in the first row
  • the lengths of the Profile elements of the second row are larger than the lengths the profile elements of the first row
  • the lengths of the Gaps in the second row are smaller than the lengths of the Profile elements of the second row and smaller than the lengths the gaps in the first row.
  • the lengths of the profile elements and the gaps were expressed in circumferential angles above.
  • the lengths L 1 and L 2 are in a range between approximately 200 mm and approximately 450 mm.
  • peripheral speeds achieved by adjusting the rotor speed the rotor are expediently between about 10 m / s and about 40 m / s, generally the best sorting results with circumferential speeds of approximately 15 to about 30 m / s can be reached.
  • FIGS. 3 and 4 86a-86d and 88a-88d of the preferred shown Embodiment.
  • Each of these profile elements exists - sees one looks from the rotor jacket 84 - the first flank from one I forming bar 100, one forming the second flank II curved sheet 102 and two side walls 104, with respect 3 should be noted that in this Figure because of the oblique course of the first flanks I and so that the last 100 bars not perpendicular to theirs Longitudinal extension, but were cut at an angle to it.
  • Those of the rotor jacket 84, the strips 100, the sheets 102 and the side walls 104 enclosed cavities 106 of the profile elements should be liquid tight or with a filler, such as. a foam plastic, to be filled in to avoid the creation of imbalances in the rotor. Same thing applies to the cavity of the rotor body 82.
  • FIGS. 6 and 8 there are 300 in the wall of the screen 38 around the screen axis 34 a plurality of rows 302 (6 rows in the illustrated embodiment) of screen openings 38a formed between which annular webs 304 are provided, in the areas of which the screen wall 300 has neither screen openings nor a surface profile.
  • FIG. 6 shows forms the inner surface of the circular cylindrical, concentric to the axis 34 Siebs 38 whose upstream side 306, its outer surface the downstream side 308 of the sieve.
  • FIGS. 7-9 and in particular using FIG. 9 the design and arrangement of the screen openings 38a are explained in more detail, being for a simpler drawing 9 shows the screen wall 300 in a flat, level manner Condition was drawn, e.g. B. in that state in which is made of stainless steel sheet Screen wall 300 during processing and before bending as well Welding to a circular cylinder. Show however Figures 7 - 9 slot-shaped sieve passage channels instead Sieve passage channels designed according to the invention as bores.
  • Siebs are each of the sieve openings 38a in cross section to the Sieve axis consisting of four components, which are partially mutually exclusive overlap, namely from three grooves and a sieve passage.
  • the sheet forming the sieve wall 300 was used for each sieve opening 38a from the inflow side 306 an inlet side Milled groove 400, from the downstream side 308 forth first an inner groove 402 and then an outer groove 404, the opening angle of which is greater than that of inner groove 402.
  • Sieve passage channels 406 were then in the Screen wall 300 incorporated, which grooves 400 and 402 together connect.
  • each Sieve opening 38a is arranged relative to one another in such a way that after bending the screen wall 300 to the circular cylindrical Sieve 38 all on one containing the sieve axis 34 Diameter plane 408 lie - this diameter plane thus represents the central plane of the screen passage 406, likewise the center planes of the grooves 402 and 404, which too this diameter plane 408 are symmetrical, and finally, the bottom of the groove 400 also lies on the diameter plane 408.
  • Siebs is approximately the total thickness of the sieve wall 6 mm, the one measured perpendicular to the inflow side 306
  • the depth of the groove 400 is 1 mm
  • the distance between the just formed Bottom of the groove 402 from the downstream side is 308 4 mm
  • the groove 404 should be 0.72 mm deep.
  • the opening angle (measured in the plane of the drawing of Fig. 9) of the inner Groove 402 should be 16 °, that of outer groove 404 120 °. It follows from this that 308 is measured on the outflow side the width of the measured in the circumferential direction of the sieve outer groove 404 is 2.5 mm.
  • the diameter of the as Drilled through-hole channels 406 depend on the desired sieve fineness.
  • the direction of rotation of the rotor 36 labeled "U", and in that direction it has Sieve on its upstream side 306 between two successive Grooves 400 each have a surface area 410, which with the sieve wall 300 bent into a circular cylinder Is part of a circular cylindrical surface and its or rotor direction of rotation U measured at shown preferred embodiment 0.5 mm should (generally about 20% to 30% of the maximum width of the Grooves 400).
  • each of the grooves 400 has a steeper front groove side wall 400a and 400b, a flat extending rear groove side wall, which in the illustrated preferred embodiment form an angle of 97.5 °, while the angle a between the front groove side wall 400a and the diametral plane 408 37 , 5 °, the angle ⁇ between the diameter plane 408 and the rear groove side wall 400b is 60 °.
  • a depth of the groove 400 of 1 mm this results in a width of the groove 400 of 2.5 mm, measured in the direction of rotation U of the rotor.
  • the angle by which the front groove side wall 400a is inclined with respect to the wire circumferential direction or the rotor rotation direction U is consequently 52.5 °
  • the angle of inclination of the rear groove side wall 400b with respect to the wire circumferential direction is 30 °.
  • Each of the upstream grooves 400 is with the downstream side Grooves 402 and 404 connected via several bores 406, which in the direction perpendicular to the plane of the drawing in FIG. 9 lie in a row.
  • this has a pitch of 3 mm compared to a pitch of 4 mm of a screen, which differs from the screen shown in FIG. 9 only in that not only the angle ⁇ , but also the angle a is 60 °, the opening angle of the grooves 400 is 120 °.
  • the smaller division results in an approximately 1/3 larger free passage area of the sieve, and surprisingly, a sieve according to the invention leads to an increase in throughput rate at least in proportion to the increase in the free passage area, even though the front groove side walls 400a are steeper than in the previous case Described known sieve from the company Hermann Finckh Maschinenfabrik GmbH & Co. with upstream grooves with a diameter of 408 and an opening angle of 120 °.
  • the diameter of the sieve passage channels designed as bores 406 of the sieve 38 is expediently about 1 mm to about 3.5 mm when the rotor with a peripheral speed is operated from approx. 10 to approx. 15 m / s. At higher Peripheral speeds can use smaller holes become; expediently one operates according to the invention Pressure sorter with circumferential rotor speeds of approx. 15 to approx. 40 m / s and then selects for the screen openings Bores with a diameter of approx. 0.5 to approx. 1.5 mm.

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Claims (28)

  1. Tamis (38) pour trier des suspensions fibreuses, qui est conçu avec une symétrie de révolution par rapport à l'axe du tamis (34) et présente un côté entrée (306) pour la suspension fibreuse à trier et un côté sortie (308) opposé au premier, pour des trieuses sous pression avec un rotor (36) pouvant être entraíné par rotation autour de l'axe du tamis, qui possède des éléments profilés (86a - d, 88a - d) périphériques au voisinage du côté entrée (306) de ce tamis pour générer des à-coups de pression positifs et négatifs dans la suspension fibreuse à trier, le tamis présentant sur son côté entrée (306) des rainures (400) qui se succèdent dans le sens périphérique (U) du tamis, sont à peu près parallèles à l'axe du tamis (34) et ont une forme approximative de V en section, dans chacune desquelles débouche un canal de passe au tamis (406), chacune des rainures (400) étant limitée, vue dans le sens périphérique (U) des éléments profilés, par une paroi latérale avant et une paroi latérale arrière de rainure (400a, 400b) et possédant un fond de rainure, le canal de passe au tamis (406) débouchant au moins approximativement dans le fond de rainure et la paroi latérale avant de rainure (400a) étant plus fortement inclinée que la paroi latérale arrière de la rainure (400b) par rapport au sens périphérique de tamisage (U), et une zone de surface (410) sensiblement lisse et au moins approximativement parallèle au sens périphérique étant prévue sur le côté entrée (306) du tamis (38) dans son sens périphérique (U) entre des rainures (400) successives, caractérisé en ce que,
    (a) vue en coupe et perpendiculairement à l'axe du tamis (34), la paroi latérale avant de rainure (400a) forme avec le sens périphérique de tamisage (U) un angle (90° - α) d'environ 40° jusque environ 70° ;
    (b) vue en coupe et perpendiculairement à l'axe du tamis (34), les deux parois latérales de rainure (400a, 400b) forment entre elles un angle (α+ β) d'environ 80° jusque environ 110° :
    (c) mesurée dans le sens périphérique de tamisage (U), la largeur des zones de surface (410) est égale à 20% jusqu'à 30° environ de la largeur de rainure, et en ce que
    (d) dans chacune des rainures (400) débouchent plusieurs canaux de passe au tamis (406) qui sont disposés les uns derrière les autres dans le sens longitudinal des rainures et ont la forme d'alésages.
  2. Tamis selon la revendication 1, caractérisé en ce que la paroi latérale avant de la rainure (400a) forme avec le sens périphérique de tamisage (U) un angle d'environ 45° jusque environ 60°.
  3. Tamis selon la revendication 2, caractérisé en ce que la paroi latérale avant de la rainure (40a) forme avec le sens périphérique de tamisage (U) un angle d'environ 50° jusque environ 55°.
  4. Tamis selon la revendication 3, caractérisé en ce que la paroi latérale avant de la rainure (400a) forme avec le sens périphérique de tamisage (U) un angle d'environ 52° jusque environ 53°.
  5. Tamis selon l'une quelconque ou plusieurs des revendications précédentes, caractérisé en ce que la paroi latérale arrière de rainure (400b) forme avec le sens périphérique de tamisage (U) un angle d'environ 20° jusque environ 40°.
  6. Tamis selon la revendication 5, caractérisé en ce que la paroi latérale arrière de rainure (400b) forme avec le sens périphérique de tamisage (U) un angle d'environ 25° jusque environ 35°.
  7. Tamis selon la revendication 6, caractérisé en ce que la paroi latérale arrière de rainure (400b) forme avec le sens périphérique de tamisage (U) un angle d'environ 30°.
  8. Tamis selon l'une quelconque ou plusieurs des revendications précédentes, caractérisé en ce que l'angle entre les deux parois latérales de rainure (400a, 400b) est d'environ 90° jusque environ 105°.
  9. Tamis selon la revendication 8, caractérisé en ce que l'angle entre les deux parois latérales de rainure (400a, 400b) est d'environ 95° jusque environ 100°.
  10. Tamis selon la revendication 9, caractérisé en ce que l'angle entre les deux parois latérales de rainure (400a, 400b) est d'environ 97° jusque environ 98°.
  11. Tamis selon l'une quelconque ou plusieurs des revendications précédentes, caractérisé en ce que, vu en coupe et perpendiculairement à l'axe du tamis (34), un centre du débouché, tourné vers le côté entrée (306), du canal de passe au tamis (406) est disposé au moins approximativement au point d'intersection des deux parois latérales de rainure (400a, 400b).
  12. Tamis selon l'une quelconque ou plusieurs des revendications précédentes, caractérisé en ce que le canal de passe au tamis (406) s'étend, vu en coupe et perpendiculairement à l'axe du tamis (34) et par rapport à celui-ci, à peu près dans le sens radial.
  13. Tamis selon l'une quelconque ou plusieurs des revendications précédentes, caractérisé en ce que, mesurée dans le sens radial par rapport à l'axe du tamis (34), la profondeur de la rainure (400) est d'environ 0,8 mm jusque environ 1,2 mm.
  14. Tamis selon la revendication 13, caractérisé en ce que la profondeur de rainure est d'environ 0,8 mm jusque environ 1 mm.
  15. Tamis selon la revendication 14, caractérisé en ce que la profondeur de tamisage est d'environ 1 mm.
  16. Tamis selon l'une quelconque ou plusieurs des revendications précédentes, caractérisé en ce que la largeur de la zone superficielle (410) est égale à environ 1/5 de la largeur de rainure.
  17. Tamis selon l'une quelconque ou plusieurs des revendications précédentes, caractérisé en ce que les rainures (400) et canaux de passe au tamis (406) dans une paroi de tamis à symétrie de rotation par rapport à l'axe du tamis (34) sont conçus en tôle d'acier.
  18. Tamis selon l'une quelconque ou plusieurs des revendications précédentes, caractérisé en ce que, vues sur le côté entrée (306) du tamis (38), les rainures (400) forment plusieurs rangées de rainures (302) s'étendant dans le sens périphérique de tamisage (U) et espacés les unes des autres dans le sens de l'axe du tamis (34).
  19. Tamis selon la revendication 17 ou 18, caractérisé en ce que les rainures (400) sont conçues comme des cavités générées par usinage avec enlèvement de copeaux.
  20. Tamis selon l'une quelconque ou plusieurs des revendications 17 à 19, caractérisé en ce que la paroi du tamis (300) a une épaisseur de paroi d'environ 6 mm jusque environ 10 mm à l'extérieur des orifices du tamis (400, 406, 402, 404) reliant le côté entrée (306) au côté sortie (308).
  21. Tamis selon l'une quelconque ou plusieurs des revendications précédentes, caractérisé en ce que le tamis (38) présente sur son côté sortie (308) des cavités (402, 404) dans chacune desquelles débouche au moins un canal de passe au tamis (406).
  22. Tamis selon la revendications 21, caractérisé en ce que les cavités (402, 404) ont la forme de rainures (402, 404) disposées à peu près parallèlement à l'axe du tamis (34).
  23. Tamis selon les revendications 21 ou 22, caractérisé en ce que, dans chaque plan perpendiculaire à l'axe du tamis (34), un seul canal de passe au tamis (406) débouche dans chaque cavité (402, 404).
  24. Tamis selon l'une quelconque ou plusieurs des revendications précédentes, caractérisé en ce que, dans chaque plan perpendiculaire à l'axe du tamis (34), un seul canal de passe au tamis (406) débouche dans chacune des rainures (400) situées sur le côté entrée (306) du tamis (38).
  25. Tamis selon l'une quelconque ou plusieurs des revendications précédentes, caractérisé en ce que les alésages formant les canaux de passe au tamis (406) ont un diamètre d'environ 0,5 mm jusque environ 3,5 mm.
  26. Tamis selon la revendication 25, caractérisé en ce que le diamètre d'alésage pour les trieuses sous pression avec une vitesse périphérique de rotor d'environ 10 jusque environ 15 m/s est d'environ 1 mm jusque environ 3,5 mm.
  27. Tamis selon la revendications 25, caractérisé en ce que le diamètre d'alésage pour les trieuses sous pression avec une vitesse périphérique de rotor d'environ 15 jusque environ 40 m/s est d'environ 0,5 mm jusque environ 1,5 mm.
  28. Trieuse sous pression pour des suspensions fibreuses, en particulier pour le traitement de suspensions fibreuses obtenues à partir de papier usagé, équipée d'un boítier (14), dans lequel est disposé un tamis (38) stationnaire et à symétrie de révolution par rapport à un axe de tamis (34), qui sépare dans le boítier un espace d'alimentation (54) enveloppé par le tamis d'un espace pour la pâte à papier finie (58) situé à l'extérieur du tamis, et d'un rotor (36) pouvant être entraíné par un moteur (18) autour de l'axe du tamis (34), rotor dont la surface périphérique limite conjointement avec un côté entrée (306) du tamis l'espace d'alimentation dans le sens radial, d'une alimentation (46) communiquant avec une première extrémité axiale de l'espace d'alimentation pour la suspension fibreuse à traiter et d'une sortie pour déchets de pâte (50) communiquant avec une deuxième extrémité axiale de l'espace d'alimentation, des éléments profilés (86a - d, 88a - d) étant prévus pour générer des à-coups de pression positifs et négatifs dans la suspension fibreuse sur la surface périphérique du rotor (36), lesquels éléments s'étendent dans le sens périphérique du rotor et présentent respectivement un premier flanc (I) situé en avant dans le sens de rotation (U) pour entraíner la suspension fibreuse dans le sens de rotation et un deuxième flanc (II) situé derrière le premier flanc dans le sens contraire au sens de rotation pour aspirer du liquide dans l'espace pour la pâte à papier finie et le recyclage par le tamis dans l'espace d'alimentation, caractérisé par un tamis (38) selon l'une ou plusieurs des revendications 1 à 27.
EP98122514A 1995-02-03 1995-02-03 Tamis et appareil de tamisage sous pression pour suspensions fibreuses Expired - Lifetime EP0905309B1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP95907639A EP0805890B1 (fr) 1995-02-03 1995-02-03 Trieuse sous pression de suspensions de fibres et crible pour ces trieuses sous pression
DE59509890T DE59509890D1 (de) 1995-02-03 1995-02-03 Sieb zum sortieren von sowie Drucksortierer für Fasersuspensionen
AT98122514T ATE209721T1 (de) 1995-02-03 1995-02-03 Sieb zum sortieren von sowie drucksortierer für fasersuspensionen
EP98122514A EP0905309B1 (fr) 1995-02-03 1995-02-03 Tamis et appareil de tamisage sous pression pour suspensions fibreuses

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP95907639A EP0805890B1 (fr) 1995-02-03 1995-02-03 Trieuse sous pression de suspensions de fibres et crible pour ces trieuses sous pression
EP98122514A EP0905309B1 (fr) 1995-02-03 1995-02-03 Tamis et appareil de tamisage sous pression pour suspensions fibreuses

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
EP95907639A Division EP0805890B1 (fr) 1995-02-03 1995-02-03 Trieuse sous pression de suspensions de fibres et crible pour ces trieuses sous pression

Publications (3)

Publication Number Publication Date
EP0905309A2 EP0905309A2 (fr) 1999-03-31
EP0905309A3 EP0905309A3 (fr) 1999-05-19
EP0905309B1 true EP0905309B1 (fr) 2001-11-28

Family

ID=8222222

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98122514A Expired - Lifetime EP0905309B1 (fr) 1995-02-03 1995-02-03 Tamis et appareil de tamisage sous pression pour suspensions fibreuses

Country Status (2)

Country Link
EP (1) EP0905309B1 (fr)
AT (1) ATE181120T1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7931779B2 (en) 2003-11-06 2011-04-26 Metso Paper, Inc. Screening apparatus and screen basket for screening pulp suspensions

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10304621B4 (de) * 2003-02-05 2005-04-28 Voith Paper Patent Gmbh Verfahren zur Bestimmung von rheologischen Eigenschaften einer Faserstoffsuspension

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI67588C (fi) * 1983-01-26 1985-04-10 Ahlstroem Oy Silplaot
DE3940334A1 (de) * 1989-12-06 1991-06-13 Finckh Maschf Sieb fuer drucksortierer fuer fasersuspensionen
DE4121896A1 (de) * 1991-07-02 1993-01-07 Fiedler Heinrich Gmbh Siebelement

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7931779B2 (en) 2003-11-06 2011-04-26 Metso Paper, Inc. Screening apparatus and screen basket for screening pulp suspensions

Also Published As

Publication number Publication date
EP0905309A3 (fr) 1999-05-19
ATE181120T1 (de) 1999-06-15
EP0905309A2 (fr) 1999-03-31

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