EP4334526A1 - Disque de raffineur - Google Patents

Disque de raffineur

Info

Publication number
EP4334526A1
EP4334526A1 EP22716577.6A EP22716577A EP4334526A1 EP 4334526 A1 EP4334526 A1 EP 4334526A1 EP 22716577 A EP22716577 A EP 22716577A EP 4334526 A1 EP4334526 A1 EP 4334526A1
Authority
EP
European Patent Office
Prior art keywords
pattern area
refiner
bars
active surface
pattern
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.)
Pending
Application number
EP22716577.6A
Other languages
German (de)
English (en)
Inventor
Thommy LINDBLOM
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
Valmet AB
Original Assignee
Valmet Oy
Valmet AB
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Valmet Oy, Valmet AB filed Critical Valmet Oy
Publication of EP4334526A1 publication Critical patent/EP4334526A1/fr
Pending 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
    • D21D1/00—Methods of beating or refining; Beaters of the Hollander type
    • D21D1/20—Methods of refining
    • D21D1/30—Disc mills
    • D21D1/306—Discs
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
    • D21B1/00—Fibrous raw materials or their mechanical treatment
    • D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
    • D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
    • D21B1/14—Disintegrating in mills

Definitions

  • the present invention relates to a refiner disc of a refiner for refining of lignocellulosic material. It also relates to a refiner segment for use in such a refiner disc.
  • a commonly used refiner of e.g., lignocellulosic material comprises two relatively rotating discs between which the material is refined or defibrated.
  • the pair of relatively rotating discs may in particular comprise one rotating disc, referred to as a rotor, and one static disc, referred to as a stator.
  • the pair of relatively rotating discs may comprise two rotating disc which are rotating in opposite directions.
  • These refiner discs, or at least one of them comprises an active surface which may comprise a set of bars and dams for providing an efficient refining of the material.
  • the active surface of the refiner disc is at least a part of the surface over which the material flows and is treated.
  • the active surface is often provided on a number of refiner segments which are separate parts which are supposed to be attached to the refiner disc whereby the active surface of the refiner disc is made up from a number of refiner segments.
  • the bars may be substantially radially extending and protruding structures that are arranged on the active surface of the refiner disc and are mainly used to achieve an efficient refining of the lignocellulosic material.
  • the dams are also protruding structures provided on the active surface, but they are not generally provided in a radial direction. The dams are instead provided on the active surface in such a way that a particular dam contacts, or connects, two neighbouring bars. That is, a dam is provided so that it spans over a direction that connects two adjacent bars.
  • the direction may be approximately orthogonal to the bars, but it can also be provided at an angle with regard to the bars.
  • a particular purpose with the dams is to lift the material that flows in the area between the bars (below called grooves) in an upward direction, towards a disc gap defined as the gap between two opposing refiner discs, e.g., the disc gap between a rotor and a stator or the disc gap that separates the two relatively rotating discs. It is in the disc gap between the discs that the material is refined or defibrated.
  • a natural consequence of the geometry is that a number of partially enclosed or bounded areas are created between adjacent bars. The main part of the refining material will flow in these areas.
  • a particular problem associated with refiner discs equipped with bars and dams is that the bars and dams, being structures protruding from the surface of the refiner disc, will be worn down due to the abrasive contact they have with the material to be refined.
  • the efficiency of the refiner disc will as a consequence decrease over time and there will be a need to replace refiner segments in order to achieve a satisfactory quality of the refined material, e.g., pulp.
  • An object of the invention is to provide an improved refiner disc to be used in a refiner for refining of lignocellulosic material.
  • a further object of the invention is to provide a refiner disc and a refiner segment to be used in the refiner disc which when used in a refiner will provide an effective refining process giving refined material of high quality.
  • a refiner disc of a refiner for refining of lignocellulosic material having an active surface which will be facing another refiner disc when used in the refiner, wherein said active surface comprises a pattern of bars and grooves disposed in a number of pattern areas, wherein said pattern areas are positioned side by side with each other to cover at least a part of the active surface, wherein each of said pattern areas has a length, I, extending between a first end and a second end of the pattern area and a width, w, extending between two side edges, which two side edges both extend between the first and second ends of the pattern area, wherein said second end is provided at an outer circumference of the active surface and the first end is provided closer to a centre, C, of the refiner disc than the second end is and wherein a distance between the two side edges is smallest in the first end of the pattern area and is increasing towards the second end of the pattern area, and wherein each of said pattern areas is positioned
  • a refiner segment for use in a refiner disc according to the invention wherein said refiner segment comprises a part of the active surface of the refiner disc.
  • an active surface having a pattern of bars and grooves providing a more seamless volumetric decrease is achieved.
  • the pattern areas are located side by side over the active surface in a tilted direction compared to the radial direction.
  • the design of the active surface according to the invention provides for a uniform fiber quality with less dust and shives.
  • a uniform wear and longer lifetime of the active surface pattern when the refiner disc is used in a refiner for refining lignocellulosic material is achieved according to the invention.
  • the design of the active surface can easily be optimised for example in order to achieve a volumetric decrease and hereby a uniform flow of material over the active surface. Thanks to the design of the active surface pattern according to the invention a more seamless volumetric decrease is provided which will provide the benefit of a more stable feed of wood chips, less micro-pulsation between the refiner discs, less point wear and hereby a lower energy consumption.
  • the pattern area is delimited in its second end by a part, s, of the outer circumference of the active surface, which part, s, is reaching between the two side edges of the pattern area, said part, s, having a length corresponding to an arc length of a circular sector having a central angle being between 1°-15° or between 4°-12° in a circle with the outer circumference of the active surface.
  • the centre line, c, of the pattern area is provided at an angle, p, to a radius, R, of the refiner disc, said angle, p, being between 20°-40°.
  • the bars each has a length, a thickness and a height wherein the height is extending in a perpendicular direction from the active surface, whereby a thickness, bw, of the bars within each pattern area are the same or will decrease towards the outer circumference of the active surface.
  • a distance, gw, between adjacent bars in the same pattern area are the same or will decrease towards the outer circumference of the active surface.
  • an angle, b, between a direction of length extension of each bar in a pattern area and a radius, R, of the refiner disc passing through a middle point of this bar is the same or is decreasing towards the outer circumference of the active surface.
  • a decreasing angle b for bars provided closer to the outer circumference can be provided for counteracting an increasing acceleration of the material caused by the centrifugal force closer to the outer circumference.
  • the bars are not extending all the way between the first and second side edges but are leaving an open wedge-shaped area without bars between adjacent pattern areas.
  • each pattern area there are at least three end bars in each pattern area which are shorter than an adjacent bar in a direction towards the first end of the pattern area, which end bars are the bars positioned closest to the second end of the pattern area, whereby these end bars each extends towards the outer circumference of the active surface.
  • dams are provided to the active surface, whereby each dam extends between two adjacent bars, wherein at least four dams are positioned such that they together form a continuous dam provided along a smooth curve.
  • each pattern area comprises a continuous last dam comprising at least four dams which are connecting at least five end bars of this pattern area, which end bars are the bars positioned closest to the second end of the pattern area, whereby the continuous last dam of a number of pattern areas are connected, whereby a combined continuous last dam is provided substantially along the outer circumference of the active surface.
  • a distribution of load is improved and the bars within each pattern area are strengthened.
  • a production process of the active surface is also facilitated.
  • FIG. 1 is a schematic illustration of a refiner wherein a refiner disc according to the invention may be used.
  • FIG. 2 is a schematic illustration of a cross-section of a refiner disc arrangement wherein the refiner disc according to the invention may be used.
  • FIG. 3 is a schematic top view of a refiner segment according to one embodiment of the invention.
  • FIG. 4 is a schematic illustration of a refiner segment attached to a refiner disc such as a rotor disc or a stator disc.
  • Figure 5a is a schematic illustration of an active surface of a refiner disc according to one embodiment of the invention.
  • Figures 5b and 5c show a part of the active surface in Figure 5a in more detail.
  • Figure 6 is a schematic illustration of an active surface of a refiner disc according to one embodiment of the invention.
  • Figures 7a-7c are schematic illustrations of refiner segments according to different embodiments of the invention.
  • FIG. 1 schematically illustrates a refiner that can utilize the invention.
  • Fig.l shows schematically an exemplary pulp refiner 100 in a cross-sectional view.
  • the arrangement is housed in a housing 26 that represents the outer casing of the refiner device together with all components of the device that is not essential for understanding the present invention. Examples of components not shown are an electrical motor for driving e.g. the rotation shaft, the feeding mechanism for the lignocellulosic material etc.
  • a rotor refiner disc 30 and a stator refiner disc 30* are linearly aligned along a shaft.
  • the rotor refiner disc 30 is attached to a rotation shaft 15 arranged on bearings 16.
  • the rotation shaft 15 is connected to a motor, not shown, that rotates the shaft 15, and thus the rotor refiner disc 30.
  • the stator refiner disc 30* facing the rotor refiner disc 30 can be provided with a centrally located through hole 32 that extends between a feeding channel 14 for lignocellulosic material and a refining area 19.
  • the feeding of material into the refining area 19 need not necessarily be provided via a centrally located through hole as shown in Figures 1 and 2 but can instead be distributed via through holes distributed in another way than exactly centrally.
  • the rotor refiner disc 30 can in certain embodiments be provided with a center plate 17 having a surface facing the incoming flow of lignocellulosic material.
  • the surface of the center plate 17 can be provided with structures that will direct the lignocellulosic material outwards.
  • the rotor refiner disc 30* and/or the stator refiner disc 30 comprises an active surface to enable steering and grinding of the pulp.
  • the active surface comprises often a pattern of bars and dams which will be described in more detail below.
  • the refiner disc comprises normally a number of refiner segments, each comprising a part of the active surface. The refiner segments can be attached to and removed from the refiner disc and can hereby be exchanged when a pattern on the active surface has been worn out.
  • lignocellulosic material such as wood chips or prepared wood, e.g., pulp
  • a feeding mechanism such as a screw feeder, not shown
  • the material will pass through the hole 32 in the stator refiner disc 30* and enter an area 19.
  • the area 19 is essentially defined by the open area between the rotor 30 and the stator refiner disc 30* and this area can be quite small during operation.
  • the lignocellulosic material flowing into the area 19 will be incident on the center plate 17 on the rotor refiner disc 30.
  • the center plate 17 acts to steer the lignocellulosic material out towards the refiner segments on the rotor and/or stator refiner disc.
  • FIG. 2 illustrates a cross-sectional side view of a rotor - stator arrangement housed in a housing 31 in a refiner as e.g., described above. Shown is a rotor refiner disc 30, that is arranged to rotate around a rotation shaft and a stator refiner disc 30*.
  • the rotor refiner disc 30 is provided, on the surface facing the stator refiner disc 30*, with an active surface 1.
  • the stator refiner disc 30* may also be provided, on the surface facing the rotor refiner disc 30, with an active surface 1.
  • the active surface 1 can be provided to one or more refiner segments 2 as described above.
  • Such refiner segments 2 provided on the rotor refiner disc 30 and the stator refiner disc 30* respectively may or may not be equally designed.
  • the refiner disc according to the invention may be either one or both of the rotor and stator refiner discs 30, 30* or one or both of two rotor refiner discs in the case of two rotating discs.
  • the rotor and stator refiner discs may in certain versions of a refiner be referred to as segment holders since one of the purposes of the refiner discs are to carry refiner segments.
  • an inlet 32 for the lignocellulosic material subject to refining is also illustrated in FIG. 2 .
  • the inlet 32 is arranged in a central area of the stator refiner disc 30*, however, a central location of the inlet 32 is not necessary as discussed above.
  • a center plate 17 Arranged in a center area of the rotor refiner disc 30, opposing the inlet 32, is a center plate 17.
  • the purpose of the center plate 17, which was described above with reference to FIG. 1, is to distribute material that falls in from the inlet 32 towards the outer sections of the rotor refiner disc 30. That is, the center plate 17 acts to distribute the material towards the active surface 1 arranged on the rotor refiner disc 30.
  • inlets for feeding of material may be arranged differently as commonly known within this art.
  • FIG.3 provides a schematic illustration of a refiner segment 2 according to one embodiment of the invention.
  • the refiner segment 2 is to be provided to a refiner disc 30. This can be both a rotor refiner disc 30 and a stator refiner disc 30* but will only be referred to as refiner disc 30 hereafter.
  • the refiner segment 2 consists in this particular example of a sector of a circle with a removed middle part. There are however other possible geometries of refiner segments, which will be discussed further below.
  • the refiner segment 2 is to be attached to a refiner disc 30.
  • a refiner segment 2 may be provided in the shape of a sector of a circle, optionally with a removed central area for leaving room for a center plate 17 or an inlet 32 as described above.
  • a refiner segment 2 may also be provided in the shape of another part of a circle.
  • a refiner disc 30 may thus be provided with a number of refiner segments 2 whereby it will either be completely covered by refiner segments 2 or partially covered.
  • the center area of the rotor refiner disc may comprise a center plate 17 as described above.
  • FIG.3 illustrates a refiner segment 2 having an inner periphery 18a, an outer periphery 18b, a first side edge 21a and a second side edge 21b.
  • the inner periphery 18a is the periphery of the refiner segment 2 that is intended to be closest to a center, C, of the refiner disc 30 when the refiner segment 2 has been attached thereto.
  • the refiner segment 2 comprises on an upper surface la, i.e. a surface which will be facing a material flow, a pattern of bars 10 and grooves 20 which will be a part of the active surface 1 of the refiner disc 30 when the refiner segment 2 is attached to the refiner disc 30.
  • FIG. 4 is a simplified view of the refiner segment 2 in FIG.3 when attached to a refiner disc 30 of a stator ora rotor, having a center C.
  • the radial direction is illustrated by means of an arrow denoted R.
  • the radial direction extends from the center C of the refiner disc 30 toward the periphery of the refiner disc 30, passing on its way through the inner 18a and outer 18b peripheries of the refiner segment 2.
  • wood chips is refined into fiber or pulp. Large particles are refined into small particles.
  • the pattern of bars and grooves on the active surface 1 of the refiner disc 30 should suitably provide a volumetric decrease towards the outer circumference. A more coarse pattern can be provided in the center of the refiner disc and a more dense pattern in the periphery. The configuration, size, spacing and directions of bars in the pattern should be adapted for achieving this. As seamless design as possible is suitable both for fiber quality and uniformity and for wear of the refiner segments.
  • Figure 5a shows schematically an active surface 1 of a refiner disc 30 according to one embodiment of the invention.
  • a refiner disc 30 for use in a refiner 100 for refining of lignocellulosic material is provided.
  • Refiner segments 2 for use in a refiner disc 30 are also provided.
  • the active surface 1 as shown in Figure 5a can be provided on a number of refiner segments 2 as shown in Figure 3.
  • the refiner segments 2 are provided on the refiner disc 30 such that a combined active surface 1 as shown in Figure 5a is provided to the refiner disc 30.
  • the active surface 1 will be facing another refiner disc when used in the refiner and the material to be refined will hereby flow over the active surface 1 between the two refiner discs.
  • the active surface 1 comprises a pattern of bars 10 and grooves 20 disposed in a number of pattern areas 41, wherein said pattern areas 41 are positioned side by side with each other to cover at least a part of the active surface 1.
  • a groove 20 is formed between two adjacent bars 10.
  • the active surface 1 is delimited by an inner circumference 118a and an outer circumference 118b. Inside the inner circumference 118a of the active pattern 1 there may be provided other structures on the refiner disc 30 for transporting and/or refining material. There may also be provided openings for receiving the material as described above in relation to Figures 1 and 2.
  • the pattern areas 41 are in this embodiment of the invention only provided radially outside a circular pattern border 119 which is provided on the active surface 1 in between the inner circumference 118a and the outer circumference 118b.
  • the circular pattern border 119 is an imaginary border and is only shown in part by a dotted line in Figure 5a.
  • Another type of inlet bars 110 are provided in the area between the inner circumference 118a and the circular pattern border 119.
  • the inlet bars 110 are provided mainly for transporting and distributing the material from a material inlet towards the pattern areas 41. In some refiner discs there may also be provided an outer blanked part outside the outer circumference 118b of the active surface 1.
  • a section, A, of the active surface 1 is enlarged and shown in Figure 5b (corresponding to the refiner segment 2 as already shown in Figure 3).
  • Figure 5b only one pattern area 41 is shown completely.
  • Each of said pattern areas 41 has a length, I, extending between a first end 43a and a second end 43b of the pattern area 41 and a width, w, extending between two side edges 45a, 45b of the pattern area 41.
  • the two side edges 45a, 45b both extend between the first and second ends 43a, 43b of the pattern area 41.
  • each pattern area 41 is provided at the outer circumference 118b of the active surface 1 and the first end 43a of each pattern area 41 is provided closer to a centre, C, of the refiner disc 30 than the second end 43b is.
  • a distance between the two side edges 45a, 45b is smallest in the first end 43a of the pattern area 41 and is increasing towards the second end 43b of the pattern area 41.
  • the pattern area 41 is delimited in its second end 43b by a part, s, of the outer circumference 118b of the active surface 1, which part, s, is reaching between the two side edges 45a, 45b of the pattern area 41.
  • this part, s has a length corresponding to an arc length of a circular sector having a central angle being between 1°-15°, or between 4°-12°, in a circle with the outer circumference 118b. Accordingly, if the central angle of the circular sector is 1° there will be room for 360 pattern areas 41 in the active surface 1 and if the central angle of the circular sector is 15° there will be room for 24 pattern areas 41 in the active surface 1.
  • a width, w, of the pattern areas 41 in their second end 43b will be adapted such that between 24-360 pattern areas 41 can be provided side by side with their second ends 43b along the outer circumference 118b of the active surface 1.
  • each of said pattern areas 41 is positioned on the active surface 1 such that a centre line, c, of the pattern area 41, which is positioned in a centre of the pattern area 41 and is extending from the first end 43a to the second end 43b of the pattern area 41, is provided at an angle, p, to a radius, R, of the refiner disc 30 passing through a centre position, cp, of the pattern area 41, said angle, p, being between 10°-60° or in some embodiments between 20°-40°.
  • the pattern area 41 can be said to be tilted from an imaginary radial location where the centre line, c, would be provided along a radius of the refiner disc 30, to a tilted position where the first end 43a of the pattern area 41 has been rotated towards the outer circumference 118b while the second end 43b has been fixed to the outer circumference 118b.
  • the direction of this tilt is coordinated to be opposite to a rotation direction of the refiner disc when used in a refiner for refining material.
  • At least some of the bars 10 are extending along a direction between the two side edges 45a, 45b of the pattern area 41 in which the bars 10 are provided. Most of the bars do not extend outside the pattern area 41 in which they are provided, i.e. the bars both start and end within the pattern area 41. For example, at least 80 % or at least 90 % of a total number of bars 10 which are provided within one pattern area 41 extend only within said pattern area 41.
  • each pattern area 41 comprises its own set of bars 10.
  • sizes and direction of extensions of bars within the pattern areas 41 can be freely varied within each of the pattern areas 41.
  • all the bars 10 except from the bars which are closest to the second end 43b in the pattern area 41, called end bars 10a, are extending along a direction between the two side edges 45a, 45b of the pattern area 41.
  • the end bars 10a in each pattern area 41 are each shorter than an adjacent bar 10 or end bar 10a in a direction towards the first end 43a of the pattern area 41, whereby these end bars 10a each extends towards the outer circumference 118b of the active surface 1.
  • the bars 10 each has a length, a thickness (bw) and a height, wherein the height is extending in a perpendicular direction from the active surface 1.
  • the lengths of those bars 10 which are extending along a direction between the two side edges 45a, 45b of the pattern area 41, i.e. all the bars except the end bars 10a, can in some embodiments be such that they are reaching almost all the way between the two side edges 45a, 45b of the pattern area 41.
  • the direction of extension of the bars 10 may not be along the shortest way between the two side edges 45a, 45b, however the length of at least 75% of the bars 10 in a pattern area 41 can in some embodiments be at least 75% of the width, w, of the pattern area 41 where each respective bar is positioned. In some embodiments of the invention at least 90% of the bars 10 which are extending along a direction between the two side edges 45a, 45b of the pattern area 41 have a length which is at least 75% of the width, w, of the pattern area 41 where each respective bar is positioned.
  • a thickness, bw, of the bars 10 within each pattern area 41 will decrease towards the outer circumference 118b of the active surface 1. This can be seen in Figure 5c.
  • the bars 10 will be thinner and thinner the closer they are to the outer circumference 118b.
  • a decreasing thickness of the bars may be suitable because a more dense pattern can then be provided closer to the outer circumference 118b where the material has been refined into smaller parts.
  • all the bars 10 or at least some of the bars 10 may have the same thickness.
  • a distance, gw, between adjacent bars 10 in the same pattern area 41 is decreasing towards the outer circumference 118b of the active surface 1.
  • This is illustrated in Figure 5c where the distance gw has been marked.
  • This may also be suitable for providing a more dense pattern of bars and grooves towards the outer circumference 118b.
  • the distance between adjacent bars 10 may also be the same throughout the pattern area.
  • an angle, b between a direction of length extension of each bar 10 in a pattern area 41 and a radius, R, of the refiner disc 30 passing through a middle point of this bar, is decreasing towards the outer circumference 118b of the active surface 1.
  • Decreasing towards the outer circumference 118b can mean that the angle, b, is decreasing in average towards the outer circumference 118b, whereby it is not necessary that the angle, b, is changed between each of the bars 10.
  • This is illustrated in Figures 5a and 5c and can be suitable in order to counteract an increasing acceleration of the material caused by the centrifugal force closer to the outer circumference. This may be suitable for a uniform distribution of material though the refiner However, the direction of length extension of the bars 10 may also be the same for all bars.
  • FIG 3 (and in Figures 5b and 5c) one embodiment of a refiner segment 2 corresponding to the active surface 1 as shown in Figure 5a is shown.
  • This refiner segment 2 is in the form of a sector from a circle with an opening in the middle as described above.
  • a number of such refiner segments 2 are combined onto the refiner disc 30 to form the active surface 1 as shown in Figure 5a.
  • the refiner segments can also have other shapes such as for example shapes shown in Figures 7b and 7c where each refiner segment is a part of a circle with an open centre where the pattern areas 41 are kept intact such that a refiner segment comprises only complete pattern areas 41 and no parts of pattern areas as for the refiner segment 2 shown in Figure 3.
  • FIG 6 shows schematically an active surface 1' according to another embodiment of the invention. Most of the details are however the same as for the embodiment shown in Figures 5a-5c and will not be described in detail again. A difference is that in this embodiment dams 11 are provided to the active surface 1', whereby each dam 11 extends between two adjacent bars 10. Dams 11 may be provided substantially orthogonally directed with regard to the bars 10 but may also be provided with an inclination to the bars 10. Each dam 11 connects two adjacent bars 10. Dams are provided for lifting the material up from the grooves 20 at regular intervals for improving the refining process. In Figures 7a-7c three different shapes of refiner segments 102; 102'; 102” are shown corresponding to the active surface 1' of Figure 6. Details of the dams 11 are marked in Figure 7a.
  • a number of dams 11, such as at least four dams 11 are positioned such that they together form a continuous dam provided along an imaginary smooth curve.
  • each pattern area 41' comprises one continuous dam 11a which is provided along one of the side edges 45b.
  • eighth adjacent bars 10 are linked by a continuous dam 11a, however the number of connected bars 10 can of course vary.
  • Such a continuous dam 11a is suitable compared to separate dams for example in production of the refiner segments.
  • a continuous dam can strengthen the bars and a distribution of load over the refiner may be improved.
  • each pattern area 41' can also comprise a continuous last dam lib comprising for example at least four dams 11 which are connecting at least five end bars 10a of this pattern area 41'.
  • the end bars 10a are the bars positioned closest to the second end 43b of the pattern area 41a as described above.
  • the continuous last dam lib of a number of pattern areas 41' can be connected by a connecting dam lib' as shown in Figure 7a, whereby a combined continuous last dam 11c is provided substantially along the outer circumference 118b of the active surface 1; 1'.
  • Substantially can mean that a distance for the dams 11 from the outer circumference 118b can differ somewhat as shown in for example Figure 7a.
  • the combined continuous last dam 11c can be seen in Figure 6 to be provided all the way around the outer circumference 118b of the active surface 1'.
  • a combined continuous last dam 11c may be suitable in some embodiments of the invention, for example because it may provide a more robust and durable construction, and a production of the active surface can be facilitated.
  • FIGS 7a-c Different types of refiner segments 102; 102'; 102'' corresponding to the active surface 1' of Figure 6 are shown in Figures 7a-c.
  • a number of such refiner segments 102; 102'; 102'' are combined onto a refiner disc to provide an active surface 1' as shown in Figure 6.
  • the refiner segment 102 of Figure 7a is in the form of a sector of a circle with a central opening. In such a form of a refiner segment 102 there may only be room for one or a few complete pattern areas 41' together with parts of pattern areas 41'. If the pattern areas 41' instead are kept intact the refiner segments 102'; 102'' can instead be of another form as shown in Figures 7b and 7c.
  • the refiner segment 102' of Figure 7b four complete pattern areas 41' are provided in each refiner segment 102' and in the refiner segment 102'' of Figure 7c twelve complete pattern areas 41' are provided.
  • dams 11 can be provided to the active surface 1; 1' than the one shown in relation to Figures 6 and 7.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Mechanical Engineering (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
  • Paper (AREA)
  • Crushing And Grinding (AREA)

Abstract

Disque de raffineur d'un raffineur (100) pour le raffinage de matériau lignocellulosique, ledit disque de raffineur (30) présentant une surface active (1 ; 1') comprenant un motif de barres (10) et des rainures (20) disposées dans un certain nombre de zones de motif (41 ; 41'), lesdites zones de motif (41 ; 41') étant positionnées côte à côte pour recouvrir au moins une partie de la surface active (1 ; 1'). Chacune desdites zones de motif (41 ; 41') présente une longueur l, s'étendant entre une première extrémité (43a) et une seconde extrémité (43b) de la zone de motif (41 ; 41') et une largeur, w, s'étendant entre deux bords latéraux (45a, 45b) de la zone de motif, une distance entre les deux bords latéraux (45a, 45b) étant la plus petite dans la première extrémité (43a) de la zone de motif (41 ; 41') et augmentant vers la seconde extrémité (43b) de la zone de motif. Chacune desdites zones de motif (41 ; 41') est positionnée sur la surface active (1 ; 1') de telle sorte qu'une ligne centrale, c, de la zone de motif (41 ; 41') est disposée à un angle, p, par rapport à un rayon R, du disque de raffineur (30), ledit angle, p, étant compris entre 10 et 60°.
EP22716577.6A 2021-05-07 2022-04-05 Disque de raffineur Pending EP4334526A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE2150585A SE544688C2 (en) 2021-05-07 2021-05-07 Refiner disc
PCT/SE2022/050337 WO2022235182A1 (fr) 2021-05-07 2022-04-05 Disque de raffineur

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EP4334526A1 true EP4334526A1 (fr) 2024-03-13

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EP22716577.6A Pending EP4334526A1 (fr) 2021-05-07 2022-04-05 Disque de raffineur

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EP (1) EP4334526A1 (fr)
CN (1) CN117280091A (fr)
SE (1) SE544688C2 (fr)
WO (1) WO2022235182A1 (fr)

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE533826C2 (sv) * 2008-05-06 2011-02-01 Metso Paper Inc Raffinörsegment och raffinörapparat innefattande avläkningsarrangemang vid bomytor
FI125031B (fi) * 2011-01-27 2015-04-30 Valmet Technologies Inc Jauhin ja teräelementti
US9968938B2 (en) * 2012-09-17 2018-05-15 Andritz Inc. Refiner plate with gradually changing geometry
CA2890381C (fr) * 2014-05-26 2017-07-11 Valmet Technologies, Inc. Segment de lame d'un raffineur a disque
SE541985C2 (en) * 2017-11-14 2020-01-14 Valmet Oy Refiner segment in a fiber refiner
SE541835C2 (en) * 2018-02-21 2019-12-27 Valmet Oy Refiner segment
SE542690C2 (en) * 2018-07-25 2020-06-30 Valmet Oy Refiner segment with varying depth profile
EP3864217A4 (fr) * 2018-10-11 2022-07-06 Andritz Inc. Plaque de raffineur ayant des saillies d'usure entre les barres

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Publication number Publication date
SE2150585A1 (en) 2022-10-18
CN117280091A (zh) 2023-12-22
SE544688C2 (en) 2022-10-18
WO2022235182A1 (fr) 2022-11-10

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