Blade for refiner for refining lignocellulosic material and refiner comprising at least one blade

Abstract

A blade for a refiner for refining lignocellulosic material is provided, the blade comprising a blade surface configured to face another blade of the refiner and having a refining portion comprising a plurality of cutter teeth and a plurality of pulp baffles, each pulp baffle extending between two adjacent cutter teeth of the plurality of cutter teeth, the plurality of paddle baffles includes a first paddle baffle extending along a first paddle baffle axis and a second paddle baffle extending along a second paddle baffle axis, where the first paddle baffle axis is offset from the second paddle baffle axis in a direction along the first cutter tooth axis, where the first cutter tooth includes a cutter tooth section extending between the first paddle baffle axis and the second paddle baffle axis, where the first paddle baffle axis is offset from the second paddle baffle axis in a direction along the first cutter tooth axis. The width of the cutter tooth section in the width direction perpendicular to the first cutter tooth axis is larger than the width of the rest part, except the cutter tooth section, of the first cutter tooth in the width direction.

Description

Technical Field

[0001] The present patent disclosure relates to blades of a refiner for refining lignocellulosic material during pulp production and to such a refiner. Background Art

[0002] Refiners or disc refiners are commonly used in the pulping industry to refine lignocellulosic material for the production of fibrous materials such as paper and board.

[0003] A disc refiner comprises two or more opposing refining elements, at least one of which is rotatable. The rotating refining elements may be referred to as rotors or rotor side blades, while the non-rotating or stationary refining elements may be referred to as stators or stator side blades. Between the refining elements is a refining gap in which the material to be refined is ground against the refining surface. The refining surfaces of the refining elements include refiner teeth (bars) used to refine the lignocellulosic material during use, and also include a pulp dam (dam) that intersects the refiner teeth and lifts the lignocellulosic material toward the refining gap to ensure thorough refining.

[0004] Refining lignocellulosic material is costly because the energy consumption to achieve the required fiber quality is generally very high. There are some proposed improvements in this area, but further development is needed to ensure the required fiber quality while providing more energy-efficient refiner blades. In addition, refiner blades wear out during use and must be replaced regularly, ranging from a few days to a few months, depending on the lignocellulosic material and condition. The refiner is offline during blade replacement, so such replacement is inefficient and costly. Summary of the invention

[0005] One of the objects of the present disclosure is to eliminate or at least reduce the above mentioned problems. This is achieved by a blade for a refiner and a refiner comprising such a blade according to the attached respective independent claims.

[0006] In the present disclosure, according to a first aspect, a blade for a refiner is provided, the refiner being used for refining lignocellulosic material, the blade comprising a blade surface, the blade surface being configured to face another blade of the refiner and being bounded by an inner periphery and an outer periphery, wherein the blade surface has a refining portion, the refining portion comprising: a plurality of cutter teeth protruding from the blade surface, wherein each of the plurality of cutter teeth at least partially extends along a corresponding cutter tooth axis of a plurality of cutter tooth axes, wherein each corresponding cutter tooth axis extends from the inner periphery toward the outer periphery, wherein the plurality of cutter teeth comprises a first cutter tooth extending along a first cutter tooth axis of the plurality of cutter tooth axes; and a plurality of pulp guards, each pulp guard extending along a corresponding pulp guard axis of the plurality of pulp guard axes and extending between two adjacent cutter teeth of the plurality of cutter teeth, wherein the plurality of pulp guards comprises a first pulp guard extending along the first pulp guard axis and a second pulp guard extending along the first pulp guard axis. The second slurry stopper extends from the second slurry stopper axis, wherein the first slurry stopper axis deviates from the second slurry stopper axis in a direction along the first tooth axis, wherein the first slurry stopper extends from a first lateral side of the first tooth to a first adjacent tooth among the plurality of teeth, and the second slurry stopper extends from a second lateral side of the first toothper opposite to the first lateral side, wherein the first slurry stopper is closest to the outer periphery in one or more slurry stops extending from the first toothper to the first adjacent tooth, wherein the second slurry stopper is closest to the outer periphery in one or more slurry stops extending from the first toothper to the second adjacent tooth, wherein the first tooth comprises a tooth segment extending between the first slurry stopper axis and the second slurry stopper axis, characterized in that a width of the tooth segment in a width direction perpendicular to the first tooth axis is greater than a width of the remaining portion of the first toothper outside the tooth segment in the width direction.

[0007] The blade according to the present patent disclosure comprises a tooth section between the first and second paddle stops, which is thicker than the rest of the tooth. The tooth section is the boundary section between the high pressure inside the refiner and the low pressure outside the refiner. It has been found that the thickening of the tooth section beneficially prolongs the life of the blade while having no or limited impact on the refining performance.

[0008] In one embodiment, the plurality of cutter teeth comprises one or more groups of cutter teeth, each group of cutter teeth comprises a first cutter tooth, a first adjacent cutter tooth and a second adjacent cutter tooth.

[0009] In one embodiment, a plurality of blade teeth and a plurality of blade stops are arranged in a plurality of pattern areas, wherein the pattern areas are positioned side by side with each other to cover at least a portion of the blade surface. The pattern areas may have different orientations. The respective orientations of the blade tooth axis and / or blade stop axis of a first pattern area may be different from the respective orientations of the blade tooth axis and / or blade stop axis of a second pattern area adjacent to the first pattern area.

[0010] In one embodiment, each pattern area includes one or more teeth from one or more groups of teeth.

[0011] In one embodiment, the multiple groups of cutter teeth overlap each other such that a first adjacent cutter tooth of a first group of cutter teeth in one or more groups of cutter teeth is also a first cutter tooth of a second group of cutter teeth in one or more groups of cutter teeth.

[0012] In one embodiment, a first adjacent cutter tooth of a first set of cutter teeth in one or more sets of cutter teeth is also a second adjacent cutter tooth of a second set of cutter teeth in one or more sets of cutter teeth.

[0013] In one embodiment, the second adjacent cutter tooth of a first set of cutter teeth in one or more sets of cutter teeth is also the first cutter tooth of a second set of cutter teeth in one or more sets of cutter teeth.

[0014] In one embodiment, the second adjacent cutter tooth of a first set of cutter teeth in one or more sets of cutter teeth is also the first adjacent cutter tooth of a second set of cutter teeth in one or more sets of cutter teeth.

[0015] In one embodiment, a first cutter tooth of a first set of cutter teeth in one or more sets of cutter teeth is also a first adjacent cutter tooth of a second set of cutter teeth in one or more sets of cutter teeth.

[0016] In one embodiment, a first cutter tooth of a first set of cutter teeth in one or more sets of cutter teeth is also a second adjacent cutter tooth of a second set of cutter teeth in one or more sets of cutter teeth.

[0017] In one embodiment, the groups of teeth are adjacent to each other.

[0018] In one embodiment, the plurality of pattern areas include: a first pattern area of ​​blade teeth and paddle stops; a second pattern area of ​​blade teeth and paddle stops, wherein the orientation of the second pattern area is different from the orientation of the first pattern area, wherein the first pattern area and the second pattern area are positioned side by side relative to each other to cover at least a portion of the refining surface; and one or more connecting blade teeth and / or connecting paddle stops, which connect the corresponding blade teeth and / or paddle stops of the first pattern area and the second pattern area, wherein the blade teeth group of the first pattern area may not overlap with the blade teeth group of the second pattern area. In other words, the widened blade tooth section is included in the pattern area. The widened blade tooth section may not be a section of the connecting blade teeth connecting two pattern areas.

[0019] In one embodiment, the plurality of teeth are arranged such that movement along the plurality of tooth axes from the outer periphery to the inner periphery is also movement along the first circumferential direction.When the blade is used in a refiner during refining, this results in lignocellulosic material being pushed in an outward direction towards the outer periphery.

[0020] In one embodiment, the plurality of paddle blocks are arranged such that movement along respective paddle block axes of the plurality of paddle blocks from the inner periphery to the outer periphery is also movement along the first circumferential direction, the plurality of paddle block axes comprising a first paddle block axis and a second paddle block axis.

[0021] In one embodiment, the plurality of paddle blocks are arranged such that movement along respective paddle block axes of the plurality of paddle blocks from the outer periphery to the inner periphery is also movement along the first circumferential direction, the plurality of paddle block axes comprising a first paddle block axis and a second paddle block axis.

[0022] In one embodiment, the first paddle stop is closer to the outer periphery than the second paddle stop.

[0023] In one embodiment, the second paddle stop is closer to the outer periphery than the first paddle stop.

[0024] In one embodiment, the tooth segment includes a first lateral edge and a second lateral edge opposite to the first lateral edge, wherein the first lateral edge is at least partially offset relative to the first tooth axis compared to the corresponding lateral edge of the rest of the first tooth; or, the second lateral edge is at least partially offset relative to the first tooth axis compared to the corresponding second lateral edge of the rest of the first tooth.

[0025] In one embodiment, a first paddle stop extends from the first lateral edge; a second paddle stop extends from the second lateral edge; when the first lateral edge is offset, the second paddle stop is closer to the outer periphery than the first paddle stop; and when the second lateral edge is offset, the first paddle stop is closer to the outer periphery than the second paddle stop.

[0026] In one embodiment, the blade tooth segment has a triangular shape when viewed from a direction perpendicular to the blade.

[0027] In one embodiment, the blade tooth segment includes an inner end closest to the inner periphery and an outer end closest to the outer periphery, wherein a width of the blade tooth segment at the inner end is greater than a width of the blade tooth segment at the outer end.

[0028] In one embodiment, the blade tooth section has a rectangular shape when viewed from a direction perpendicular to the blade.

[0029] In one embodiment, when viewed from a direction perpendicular to the blade, the blade tooth segment has one of an angled shape, a concave arc shape, a convex arc shape, a concave shape, and a convex shape.

[0030] In one embodiment, each of the plurality of tooth axes does not intersect another of the plurality of tooth axes within the refining portion.

[0031] In one embodiment, each of the plurality of tooth axes does not intersect another of the plurality of tooth axes within the refining portion.

[0032] According to some embodiments, the barrier height of each barrier is substantially equal to the tooth height of at least one tooth intersected by the barrier. This ensures that the barrier can lift the lignocellulosic material to the refining gap to improve the refining quality.

[0033] According to other embodiments, the barrier height of each barrier is 20% to 99%, preferably 20% to 85%, of the tooth height of at least one of the finely ground teeth to which the barrier is connected. Thus, a subsurface barrier is achieved, which enables steam flow and also improves the cross-bar flow of material.

[0034] In some embodiments, the blade comprises a barrier having a barrier height substantially equal to the tooth height and further comprises at least one barrier having a barrier height that is 20% to 99%, preferably 20% to 85%, of the tooth height of at least one of the refiner teeth to which the barrier is connected. Thus, barriers and subsurface barriers may be combined as desired to improve the flow of lignocellulosic material and steam while achieving high quality refining.

[0035] Suitably, the blade may further comprise a groove extending adjacent to the baffle on the side of the baffle facing the outer periphery. Thereby, a pumping conveying of the lignocellulosic material can be achieved, wherein the material after passing the baffle can flow along the groove before entering the tooth grooves between the refiner teeth for further conveyance towards the outer periphery. This in turn improves energy efficiency and reduces wear of the refiner blade.

[0036] The width of the groove may increase towards the inner pulp barrier end. Thus, when the lignocellulosic material passes along the groove, it is urged into the tooth groove.

[0037] Furthermore, the width of the groove at the upper end may suitably be at least equal to the width of the pulp barrier. Thus, the groove is wide enough to improve the flow of the lignocellulosic material. The width at the upper end is the distance from the outer side of the pulp barrier in radial direction to the point of the refiner teeth where the refiner teeth begin to taper towards the blade surface.

[0038] Suitably, the depth of the groove may be at least equal to half the height of the barrier adjacent to the groove. Thus, the groove is deep enough to improve the flow of the lignocellulosic material.

[0039] Suitably, the blade may further comprise a reinforcement portion at which the outer slurry guard end is connected to the refiner tooth, said reinforcement portion being arranged on the side of the slurry guard facing the inner periphery.Thereby, wear is reduced, thereby further increasing the life of the blade.

[0040] Suitably, the outer end of the first blade and the outer end of the blade adjacent in the radial direction can each be connected to a different refiner tooth in the first circumferential direction. Thus, the blade overlaps in the radial direction, which increases the strength of the blade and distributes the area subject to heavy wear across the blade to make the blade stronger overall.

[0041] In some embodiments, the blade is a blade section having a center angle of 10° to 360°. Where the blade is not circular, the blade section may be combined with a plurality of similar or identical blade sections to form a circular blade.

[0042] Furthermore, there may be at least one section lacking refiner teeth.Thus, unless in the refining section, the lignocellulosic material may be conveyed across the blades without being refined.

[0043] According to a second aspect, a refiner is provided, comprising at least one blade according to any one or more embodiments of the blade of the first aspect described above and / or described below.

[0044] Numerous additional benefits and advantages of the present patent disclosure will be readily appreciated by those skilled in the art in view of the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] The present patent disclosure will now be described in more detail with reference to the accompanying drawings, in which:

[0046] Figure 1 is a schematic cross-sectional view of a refiner in which a refiner disc according to the present patent disclosure may be used;

[0047] Figure 2 is a schematic top plan view of a blade according to an embodiment of the present patent disclosure;

[0048] Figure 3 is a top plan view of a group of blade teeth of a blade according to an embodiment of the present patent disclosure;

[0049] Figure 4 is a top plan view of a group of blade teeth of a blade according to an embodiment of the present patent disclosure;

[0050] Figure 5 is a top plan view of two overlapping groups of blade teeth of a blade according to an embodiment of the present patent disclosure;

[0051] Figure 6 is a top plan view of a group of blade teeth of a blade according to an embodiment of the present patent disclosure;

[0052] Figure 7 is a top plan view of a group of blade teeth of a blade according to an embodiment of the present patent disclosure;

[0053] Figure 8 is a top plan view of a group of blade teeth of a blade according to an embodiment of the present patent disclosure;

[0054] Fig. 9 is a top plan view of a group of blade teeth of a blade according to an embodiment of the present patent disclosure;

[0055] Fig.10 is a top plan view of a group of blade teeth of a blade according to an embodiment of the present patent disclosure;

[0056] Fig.11 is a top plan view of a group of blade teeth of a blade according to an embodiment of the present patent disclosure;

[0057] Fig.12 is a top plan view of a group of blade teeth of a blade according to an embodiment of the present patent disclosure;

[0058] Fig.13 is a top plan view of a group of blade teeth of a blade according to an embodiment of the present patent disclosure; and

[0059] Fig.14 It is a schematic top plan view of a blade according to another embodiment of the present patent disclosure.

[0060] All drawings are schematic, not necessarily to scale, and generally show only parts that are helpful in explaining the various embodiments, while other parts may be omitted or merely suggested. Unless otherwise indicated, any reference numerals appearing in multiple drawings refer to the same object or feature in the drawings. DETAILED DESCRIPTION

[0061] refer to Figure 1 , which schematically illustrates a refiner that can utilize the present patent disclosure. Figure 1 A cross-sectional view of a pulp refiner 1 is schematically shown. Examples of components not shown are an electric motor for driving, for example, a rotating shaft, a feeding mechanism for lignocellulosic material, etc. The rotor refiner discs 36 and the stator refiner discs 36* are linearly aligned along a shaft (not shown). The rotor refiner discs 36 may be attached to a rotating shaft arranged on bearings. The rotating shaft may be connected to a motor (not shown) which rotates the shaft and thereby the rotor refiner discs 36. The stator refiner discs 36* facing the rotor refiner discs 36 may be provided with a centrally located through hole 38 extending between the feed channel for lignocellulosic material and the refining area 19. Feeding the material into the refining area 19 does not necessarily require passing through a shaft such as Figure 1The rotor refiner disc 36 is not provided with a centrally positioned through hole as shown, but can be distributed via through holes distributed in a manner other than being centrally positioned. In some embodiments, the rotor refiner disc 36 can be provided with a center plate 16 having a surface facing the incoming flow of the lignocellulosic material. The surface of the center plate 16 can be provided with a structure that guides the lignocellulosic material outward. The rotor refiner disc 36* and / or the stator refiner disc 36 are provided with refiner blades 10 to achieve the diversion and grinding of the pulp. These refiner blades 10 can be provided with blade teeth and pulp stops, which will be described in more detail below. In some refiners, there can be two rotor refiner discs instead of a rotor refiner disc and a stator refiner disc, wherein the two rotor refiner discs rotate in opposite directions. The present patent disclosure can also be applied to such refiners.

[0062] During use, lignocellulosic material (e.g. pulp) such as wood chips or prefabricated wood will be fed through the feed channel 14 by means of a feeding mechanism not shown, such as a screw feeder. The material will pass through the holes 38 in the stator refiner disk 36* and enter the area 19. The area 19 is essentially defined by the open area between the rotor 30 and the stator refiner disk 36*, and this area can be quite small during operation. The lignocellulosic material flowing into the area 19 will be incident on the center plate 16 on the rotor refiner disk 36. The center plate 16 serves to direct the lignocellulosic material toward the refiner blades 10 on the rotor and / or stator refiner disk.

[0063] As used herein, the term "lignocellulosic material" refers to a material comprising cellulose, and preferably also comprising lignin and hemicellulose. An example of such a material is wood, and other examples include other agricultural or forestry wastes. When refining lignocellulosic material, lignocellulosic material may also refer to a material containing primarily cellulose, such as cotton.

[0064] The rotor refiner disc 36 is provided with at least one refiner blade 10 on the surface facing the stator refiner disc 36*. The stator refiner disc 36* is also provided with at least one refiner blade 10 on the surface facing the rotor refiner disc 36. These refiner blades 10 respectively provided on the rotor refiner disc 36 and the stator refiner disc 36* can be designed identically or can be designed differently. The refiner blades according to the present patent disclosure can be provided to one or both of the rotor refiner disc 36 and the stator refiner disc 36*, or in the case of two rotating discs, can be provided to one or both of the two rotor refiner discs. The rotor and stator refiner discs can be called segment holders in certain patterns of refiners, because one of the purposes of the refiner discs is to carry the refiner blades 1.

[0065] The above has been combined Figure 1 A general refiner 1 is described which can utilize the patent disclosure. Figure 2A schematic diagram of an example of a refiner blade 1 according to the present patent disclosure is provided. The refiner blade 1 is to be provided to a refiner disc 36. This can be both a rotor refiner disc 36 and a stator refiner disc 36*, but will only be referred to as a refiner disc 36 in the following. In this particular example, the refiner blade 1 consists of a circular sector. There are other types of refiner blades, however, the present patent disclosure works equally well for all specific refiner blade shapes. The refiner blade 1 is provided in the shape of a segment to be attached to the refiner disc 36. As mentioned above, the refiner blade 1 can be provided in the shape of a circle, which optionally has a removed central area to leave room for the center plate 16 or the inlet 38. The refiner blade 1 can also be provided in the shape of a circular sector, wherein the circle optionally has a removed central area or is provided in the shape of another part of a circle. Therefore, the refiner disc 36 can be provided with a plurality of refiner blades 1, whereby it will be completely covered or partially covered by the refiner blade 1. Where the refiner blades 10 form part of a rotor refiner disc 36 , the central region of the rotor refiner disc may include a central plate 16 as described above.

[0066] Figure 2 A blade 10 according to a first embodiment of the present disclosure is shown. The blade 10 according to any embodiment of the present disclosure shown in the drawings may be a portion of a circular blade of which only a portion is shown, or alternatively may be a blade segment configured to be mounted together with a plurality of similar blade segments to form a circular blade.

[0067] As described above, in use, the blade 10 is typically installed in a disc refiner such as the refiner 1 and serves to refine lignocellulosic material by acting as a blade in a pair of blades arranged to face each other, wherein at least one blade of the pair is arranged to rotate. Typically, the blades arranged to rotate in the disc refiner are referred to as rotor-side blades, while the blades arranged to be stationary are referred to as stator-side blades. In use, a refining gap is formed between the blades, so that the lignocellulosic material passing through the refining gap is refined by the refiner teeth arranged on each blade.

[0068] This patent disclosure describes various embodiments, and it is particularly noted that features from one embodiment can be freely introduced into another embodiment, unless such a combination is explicitly stated as inappropriate or undesirable. Therefore, the embodiments disclosed herein can be combined with each other as needed.

[0069] It should be noted that each embodiment shown in the drawings may be only a portion of a blade 10, and the blade 10 itself may include additional portions at the inner periphery 11 and on each side shown in each drawing. Therefore, these drawings will be viewed as embodiments having a pattern of refiner teeth and blade guards that may be repeated across the entire blade 10 or may be provided in only a portion of the blade 10.

[0070] Figure 2 The blade 10 shown is defined by an inner periphery 11 and an outer periphery 12 and includes a blade surface 13. On the blade surface 13 is at least one refining portion 14 including a plurality of refiner teeth 20 extending outwardly from the blade surface 13. The refining portion 14 may extend across the entire blade surface 13, but in most embodiments, the blade surface 13 also includes other portions that do not include refiner teeth 20. Figure 2 In the embodiment shown, the blade 10 lacks refiner teeth 20 in a portion close to the inner periphery 11 , but the refiner teeth 20 may also be provided in other portions of the blade surface 13 .

[0071] The refiner teeth 20 each comprise an outer tooth end 21 and an inner tooth end 22, wherein the outer tooth end 21 is closer to the outer periphery 12 than the inner tooth end 22. The refiner teeth 20 are arranged such that a movement along the bar extension, i.e. a movement along a single refiner tooth 20 from the outer tooth end 21 to the inner tooth end 22, is also a movement along the first circumferential direction D. When the blade 10 is arranged in a refiner, the first circumferential direction D is the direction of rotation, and the first rotational direction D is further perpendicular to a radial direction R, which is defined as the direction from a point on the inner periphery 11 to a point on the outer periphery 12 that is closest to the point on the inner periphery 11. A movement along the bar extension is a movement along the first circumferential direction D, which is understood herein as a movement having a component directed along the first circumferential direction D. There may also be a component in a radial direction perpendicular to the first circumferential direction D.

[0072] Each of the plurality of teeth 20 extends at least partially along a corresponding tooth axis of the plurality of tooth axes 230, 240, 250 ( Figure 3 ). Each corresponding tooth axis extends from the inner periphery 11 toward the outer periphery 12. The plurality of teeth 20 include a first tooth 23 extending along a first tooth axis 230 among the plurality of tooth axes, a first adjacent tooth or a second tooth 24 extending along a second tooth axis 240, and a second adjacent tooth or a third tooth 25 extending along a third tooth axis 250.

[0073] Each paddle block extends along a corresponding paddle block axis of the plurality of paddle block axes 410, 420 and between two adjacent blade teeth of the plurality of blade teeth 20. The plurality of paddle blocks 30 includes a first paddle block 41 extending along a first paddle block axis 410 and a second paddle block 42 extending along a second paddle block axis 420, wherein the first paddle block axis 410 is offset from the second paddle block axis 420 by an offset 421 in the direction of the first blade tooth axis 230. The first paddle block 41 extends from a first lateral side 28 of the first blade tooth 23 to a first adjacent blade tooth 24. The second paddle block 42 extends from a second lateral side 29 of the first blade tooth 21 opposite to the first lateral side 28 to a second adjacent blade tooth 25.

[0074] In one or more blade teeth 30 extending from the first blade tooth 23 to the first adjacent blade tooth 24, the first blade tooth 41 is closest to the outer periphery 12. In one or more blade teeth 30 extending from the first blade tooth 23 to the second adjacent blade tooth 25, the second blade tooth 42 is closest to the outer periphery 12.

[0075] The first tooth 23 includes a tooth section 44 extending between the first blade barrier axis 410 and the second blade barrier axis 420. The tooth section is a boundary section between the high pressure inside the refiner and the low pressure outside the refiner. The width of the tooth section 44 along a width direction 45 perpendicular to the first tooth axis 230 is greater than the width of the remaining portion 46 of the first tooth 23 outside the tooth section 44 along the width direction 45. Therefore, the first tooth 23 includes an additional lateral portion 47 in the tooth section 44. Figure 3 The lateral portion 47 in the embodiment is present at the first lateral side 28, Figure 3 In the example of FIG. 4 , the first lateral side is located outside the first pulp barrier 41, towards the outer periphery 12. In terms of the flow of lignocellulosic material, the lateral portion 47 is located Figure 2 The downstream side of the first blade tooth 23.

[0076] Alternatively, if Figure 4 As shown, the lateral portion 47 can be located at the second lateral side 29 of the first tooth 23. In terms of the flow of lignocellulosic material, the lateral portion 47 is located at Figure 3 The upstream side of the first blade tooth 23.

[0077] It should be noted that although Figure 2 , Figure 3 and Fig.14 The blade teeth 20 and the slurry guard 30 are shown as outlined lines, and Figures 4 to 13 The blade teeth and paddle guard 30 are shown drawn with solid black blocks, unless otherwise noted, and this difference in drawing style has no technical significance and is only used to facilitate understanding of the various embodiments described herein.

[0078] Another alternative is that the first tooth 23 includes a first lateral portion 47 at the first lateral side 28 and a second lateral portion 48 at the second lateral side 29. In other words, both the downstream side and the upstream side of the first tooth 23 are provided. An example of such a configuration is shown in FIG. Figures 5 to 14 shown. Figures 5 to 14 The embodiment of the present invention shows a first lateral portion 47 and a second lateral portion 48, but it is also possible to have only one of these lateral portions. Figures 5 to 14 It is used to illustrate other configurations, but is not limited to having two lateral portions.

[0079] The tooth segment 44 may include a first lateral edge 61 and a second lateral edge 62 opposite the first lateral edge 61. The first lateral edge 61 may be at least partially offset relative to the first tooth axis 230 compared to a corresponding lateral edge of the remainder 46 of the first tooth 23. Alternatively, the second lateral edge 62 may be at least partially offset relative to the first tooth axis 230 compared to a corresponding second lateral edge of the remainder 46 of the first tooth 23.

[0080] The first paddle stop 41 may extend from the first lateral edge 61. The second paddle stop 42 may extend from the second lateral edge 62.

[0081] When the additional portion 47 is on the downstream side of the first blade tooth and the first lateral edge 61 is offset, the second paddle stop 42 is closer to the outer peripheral edge 12 than the first paddle stop 41 .

[0082] When the additional portion 47 is on the upstream side of the first blade and the second lateral edge 62 is offset, the second paddle stop 42 is closer to the outer peripheral edge 12 than the first paddle stop 41. When the additional portion 47 is on the upstream side of the first blade and the first lateral edge 61 is offset, the first paddle stop 41 is closer to the outer peripheral edge 12 than the second paddle stop 42.

[0083] The plurality of teeth 20 may include one or more groups of teeth 17, 18 ( Figure 5 ), each group of teeth includes a first tooth 23, a first adjacent tooth 24 and a second adjacent tooth 25.

[0084] Multiple blade teeth 20 and multiple slurry stops 11 can be arranged in multiple pattern areas 8, 9 ( Figure 1 The pattern areas 8, 9 are positioned side by side with each other to cover at least a portion of the blade surface 10. Each of the pattern areas 8, 9 comprises one or more of one or more groups of teeth 17.

[0085] The tooth groups 17, 18 may overlap each other so that the first adjacent tooth 24 of the first group of teeth 17 is also the first tooth of the second group of teeth 18. Figure 5As shown. The first group 17 includes the tooth 23 as the first tooth, the tooth 24 (or tooth 25) as the first adjacent tooth, and the tooth 25 (or tooth 24) as the second adjacent tooth. The second group 18 includes the tooth 25 as the first tooth, the tooth 23 (or tooth 26) as the first adjacent tooth, and the tooth 26 (or tooth 23) as the second adjacent tooth. This configuration of the groups is the result of the offset of each outermost slurry barrier relative to the next outermost slurry barrier. In these cases, the first tooth includes the first lateral portion 47 or the second lateral portion 48 or both.

[0086] The tooth 26 extends along the tooth axis 260. The paddle stop 49 extends between the tooth 25 and the tooth 26. The paddle stop 49 is another example of a paddle stop closest to the outer periphery 12, and in this example is a paddle stop extending from the tooth 25 to the tooth 25, wherein the tooth 25 can be regarded as the first adjacent tooth of the tooth 26.

[0087] Alternative Figure 5 The second group 18 may include tooth 26 as its first tooth, tooth 25 being the first adjacent tooth or the second adjacent tooth, and the other adjacent tooth not being in Figure 5 20, but in this example, the blade teeth will be toward the right side of the blade teeth 26. This configuration is the result of the two outermost slurry guards extending from opposite sides of the blade teeth 20 being arranged without offset. An example of this is shown in FIG. Fig.14 As shown, the paddle stops 410 and 420 are not offset relative to each other in the direction along the blade teeth 25. In other words, the paddle stops 410 and 420 are substantially aligned. Therefore, there is no widening of the blade teeth 25 in this case.

[0088] Alternatively, the groups of teeth are adjacent to each other, ie, the teeth are not part of more than one group of three teeth. This configuration is the result of at least three adjacent outermost slurry guards being substantially aligned.

[0089] The number of pattern areas 8, 9 may include a first pattern area 8 of the blade teeth and the paddle stop, and a second pattern area 9 of the blade teeth and the paddle stop ( Figure 1 ). The orientation of the second pattern area 9 is different from the orientation of the first pattern area 8. The first pattern area 8 and the second pattern area 9 are positioned side by side relative to each other to cover at least a portion of the refining surface 14. The respective angles (α) of the slurry of each pattern are different. Figure 1 In pattern 9, the angle of the blade teeth 20 relative to the rotation direction D in the clockwise direction is smaller than the angle of the blade teeth 20 relative to the rotation direction D in the clockwise direction in pattern 8.

[0090] One or more connecting teeth 82 and / or connecting paddle stops 84 may be provided between each pattern, and the connecting teeth 82 and / or connecting paddle stops 84 connect the corresponding teeth and / or paddle stops of the first pattern area 8 and the second pattern area 9. The tooth group of the first pattern area 8 may not overlap with the tooth group of the second pattern area 9.

[0091] The first slurry stopper 41 may be closer to the outer periphery 12 than the second slurry stopper 42. Alternatively, the second slurry stopper 42 may be closer to the outer periphery 12 than the first slurry stopper 41. This configuration is mainly as follows Figure 3 , Figure 4 and Figure 5 shown.

[0092] The tooth section 44, the additional portion 47 and / or the additional portion 48 may have different shapes. Figures 1 to 5 As shown, the blade segment 44 may have a triangular shape when viewed from a direction perpendicular to the blade 10. The blade segment 44 may include an inner end 54 closest to the inner periphery 11, and an outer end 55 closest to the outer periphery 12, wherein the width of the blade segment 10 at the inner end 54 is greater than the width of the blade segment 10 at the outer end 55. In this way, a triangle shape may be formed, particularly when the first lateral edge 61 or the second lateral edge 62 (regardless of which offset) is formed straight.

[0093] like Figure 6 As shown, the blade segment 44 , the additional portion 47 and / or the additional portion 48 may have a rectangular shape when viewed from a direction perpendicular to the blade 10 .

[0094] Alternatively, when viewed from a direction perpendicular to the blade 10, the blade segment 44, the additional portion 47 and / or the additional portion 48 may have an angled shape ( Figure 7 , Figure 8 and Fig. 9 ), concave arc shape ( Fig.10 ), convex arc shape (see Fig.11 ), concave shape ( Fig.12 ) and convex shapes (see Fig.13 ).

[0095] The shapes of the first additional portion 47 and the second additional portion 48 may be the same or different.

[0096] Typically, each of the plurality of blade tooth axes 230, 240, 250 may not intersect another blade tooth axis of the plurality of blade tooth axes 230, 240, and 250 within the refining section 14. Additionally or alternatively, each of the plurality of blade barrier axes 410, 420 may not intersect another blade barrier axis of the plurality of blade barrier axes 410, 420 within the refining section 14.

[0097] The arrangement of the refiner teeth 20 is such that the refiner teeth 20 are inclined relative to the radial direction R to form a tooth angle α ( Figure 4 ). In some embodiments, the refiner teeth 20 are parallel to each other, but in other embodiments, at least one of them may not be parallel to the other refiner teeth. Furthermore, in some embodiments, the refiner teeth form a straight line, but in some embodiments, the refiner teeth may be curved. Furthermore, in some embodiments, the refiner teeth 20 may vary across the blade 10, such that some of them form a straight line, while others are curved, and some of them are parallel, but others are not. At the inner tooth end 22, the teeth 20 preferably taper toward the blade surface 13. The tooth angle α of each refiner tooth 20 may be different, but advantageously may be in the range of 5° to 60°.

[0098] At least one slurry stop 30 is also provided on the fine grinding part 14 to connect at least two fine grinding machine teeth 20. Each slurry stop 30 extends from an outer slurry stop end 31 to an inner slurry stop end 32 ( Figure 3 ), wherein the outer slurry stop end 31 is closer to the outer periphery 12 than the inner slurry stop end 32. Figure 2 In an embodiment of the dam 30, the dams 30 are further arranged such that movement along the dam extension, i.e. movement along a single dam 30 from the inner dam end 32 to the outer dam end 31, is also movement along the first circumferential direction D. This means that the dams 30 are inclined relative to the radial direction R to form a dam angle of less than 90° in the counterclockwise direction. The dam angle β of each dam 30 may be different, but may advantageously be in the range of 30° to 85°. In an embodiment of the dam 30 being curved, the dam angle β may appropriately decrease when moving from the outer dam end 31 towards the inner dam end 32.

[0099] In case the blade 30 is connected to the refiner tooth 20, a connection angle γ is formed in the corner facing the first circumferential direction D and facing the inner periphery 11. The connection angle γ may advantageously be in the range of 30° to 85°, which ensures efficient refining of the lignocellulosic material and reduced energy consumption.

[0100] The blade angle α may vary across the segment. Advantageously, a larger blade angle α is provided towards the center of the blade 10, i.e. towards the inner periphery 11, but a smaller blade angle is provided when the blade is closer to the outer periphery 12. Furthermore, the barrier angle β may vary across the segment, and advantageously, a smaller barrier angle β is provided near the inner periphery 11, while a larger barrier angle β is provided near the outer periphery 12. Thus, when moving across the blade 10 in the radial direction R from the inner periphery 11 to the outer periphery 12, the blade angle α decreases, while the barrier angle β increases.

[0101] Figure 2 The paddle blocks 30 shown are arranged so that two refiner teeth 20 are connected by more than one paddle block 30, which are arranged along the same refiner tooth 20 but at different distances from the inner periphery 11. In other embodiments, the paddle blocks 30 may alternatively be arranged so that only some of the refiner teeth 20 connected by one paddle block 30 are connected by another paddle block 30 closer to the inner periphery 11, or so that each refiner tooth 20 is connected to only one paddle block 30 at each lateral side of the respective refiner tooth 20.

[0102] The slurry barriers 30 may each form a straight line or a curved line, and they may be parallel or non-parallel to each other as desired.

[0103] The inner tooth end 22 of the tooth 20 being arranged further in the first axial direction D than the outer tooth end 21 means that the tooth 20 can lift the lignocellulosic material from the tooth groove 40 into the refining gap to improve refining while enabling the lignocellulosic material to be efficiently transported from the inner periphery 11 across the blade 10 to the outer periphery 12. Examples of the groove 40 are as follows Figure 3 As shown, they are groove 51 and groove 52, respectively. Groove 51 is arranged adjacent to paddle block 41 at its inner peripheral side, and is arranged between the first blade tooth 23 and the first adjacent blade tooth 24. Groove 52 is arranged adjacent to paddle block 42 at its inner peripheral side, and is arranged between the first blade tooth 23 and the second adjacent blade tooth 25. Groove 52 is further defined by paddle block 43, which is the second outermost paddle block relative to paddle block 42.

[0104] exist Figure 2 In the embodiment of the present invention, the barrier height of the barrier 30 is preferably substantially equal to the tooth height of one or more corresponding teeth 20 that the barrier 30 intersects. This means that the barrier 30 lifts the cellulosic material up to the refining gap and prevents lignocellulosic material that has not been refined by the refiner teeth 20 from crossing the barrier 30. The barrier height being substantially equal to the tooth height is understood to mean that they are equal within manufacturing tolerances, or at least do not differ from each other by more than 10% of their height from the blade surface 13. In the first embodiment, all barrier heights 30 have this barrier height, but in other embodiments at least one of them may be lower. A barrier height substantially equal to the tooth height is also advantageous in terms of increasing the pressure between the blades during refining.

[0105] Fig.14 The illustrated embodiment of the blade 10 includes a mounting hole 150 for mounting the blade 10 , which may be a blade segment.

[0106] As mentioned above, the blade 10 may be a circular blade, but may alternatively be a blade section having a central angle of 10° to 360°. A plurality of blade sections may then be mounted in a refiner to form a circular blade.

[0107] The refining portion 14 may extend from the inner periphery 11 across the entire blade surface 13 to the outer periphery 12. Alternatively, there may also be other portions on the blade surface 13, such as those described above and Figure 5 There may also be a portion comprising refiner teeth arranged between the refining portion 14 and the inner periphery 11. Furthermore, there may be at least one portion on the blade surface 13 without refiner teeth, and such a portion may be arranged close to the inner periphery 11, close to the outer periphery 12 or at any other portion of the blade surface.

[0108] Furthermore, in some embodiments, there may be two or more refiner portions 14 according to the present disclosure on a blade surface 13, while another portion includes refiner teeth or has no refiner teeth therebetween.

[0109] The present patent disclosure also relates to a refiner, which comprises at least one blade 10 according to any embodiment of the patent disclosure disclosed herein. In some embodiments, the refiner may include two blades 10 according to the present patent disclosure, wherein one blade is arranged as a rotor-side blade and the other blade is arranged as a stator-side blade. In other embodiments, one blade 10 according to the present patent disclosure may be arranged as a rotor-side blade or a stator-side blade together with a refiner blade according to the prior art.

[0110] It is to be noted that features from the various embodiments described herein may be freely combined, unless it is explicitly stated that such a combination would be inappropriate.

Claims

1. A blade (10) for a refiner (1) for refining lignocellulosic material, the blade (10) comprising a blade surface (13) which is configured to face another blade (4) of the refiner (1) and is delimited by an inner peripheral edge (11) and an outer peripheral edge (12), wherein: The blade surface (13) has a fine grinding portion (14), and the fine grinding portion comprises: a plurality of blade teeth (20) protruding from the blade surface (13), wherein each of the plurality of blade teeth extends at least partially along a respective blade tooth axis among a plurality of blade tooth axes (230, 240, 250), wherein each respective blade tooth axis extends from the inner periphery (11) toward the outer periphery (12), wherein the plurality of blade teeth (20) includes a first blade tooth (23) extending along a first blade tooth axis (230) among the plurality of blade tooth axes (230, 240, 250); and A plurality of paddle blocks (30), each paddle block extending along a corresponding paddle block axis among a plurality of paddle block axes (410, 420) and extending between two adjacent blade teeth among the plurality of blade teeth (20), wherein the plurality of paddle blocks (30) include a first paddle block (41) extending along a first paddle block axis (410) and a second paddle block (42) extending along a second paddle block axis (420), wherein the first paddle block axis (410) deviates from the second paddle block axis (420) in a direction along the first blade tooth axis (230), wherein the first paddle stop (41) extends from a first lateral side (28) of the first tooth (23) to a first adjacent tooth (24) among the plurality of teeth (20), and the second paddle stop (42) extends from a second lateral side (29) of the first tooth (21) opposite to the first lateral side (28) to a second adjacent tooth (25) among the plurality of teeth (20), wherein the first slurry stop (41) is closest to the outer peripheral edge (12) among one or more slurry stops extending from the first blade tooth (23) to the first adjacent blade tooth (24), wherein the second slurry stop (42) is closest to the outer peripheral edge (12) among one or more slurry stops extending from the first blade tooth (23) to the second adjacent blade tooth (25), The first blade tooth (23) comprises a blade tooth section (44) extending between the first blade block axis (410) and the second blade block axis (420), It is characterized in that the width of the tooth section (44) in the width direction (45) perpendicular to the first tooth axis (230) is greater than the width of the remaining part (46) of the first tooth (23) outside the tooth section (44) in the width direction (45).

2. The blade (10) according to claim 1, characterized in that The plurality of blade teeth (20) include one or more groups of blade teeth (17, 18), each group of blade teeth includes the first blade tooth (23), the first adjacent blade tooth (24) and the second adjacent blade tooth (25).

3. The blade (10) according to claim 2, characterized in that The plurality of blade teeth (20) and the plurality of blade stops (11) are arranged in a plurality of pattern areas (8, 9), wherein the pattern areas (8, 9) are positioned side by side with each other to cover at least a portion of the blade surface (10), wherein each pattern area (8, 9) comprises one or more blade teeth from the one or more groups of blade teeth (17).

4. The blade (10) according to claim 2 or 3, characterized in that: The blade tooth groups (17, 18) overlap each other so that: The first adjacent tooth (24) of a first group (17) of the one or more groups of teeth (17, 18) is also the first tooth of a second group (18) of the one or more groups of teeth (17, 18); and / or A first adjacent tooth (24) of a first group (17) of the one or more groups of teeth (17, 18) is also a second adjacent tooth of a second group (18) of the one or more groups of teeth (17, 18); and / or The second adjacent tooth (25) of the first group (17) of the one or more groups of teeth (17, 18) is also the first tooth of the second group (18) of the one or more groups of teeth (17, 18); and / or The second adjacent tooth (25) of the first group (17) of the one or more groups of teeth (17, 18) is also the first adjacent tooth of the second group (18) of the one or more groups of teeth (17, 18); and / or The first tooth (23) of a first group (17) of the one or more groups of teeth (17, 18) is also the first adjacent tooth of a second group (18) of the one or more groups of teeth (17, 18); and / or A first tooth (23) of a first set (17) of the one or more sets of teeth (17, 18) is also a second adjacent tooth of a second set (18) of the one or more sets of teeth (17, 18).

5. The blade (10) according to claim 2 or 3, characterized in that: The blade tooth groups (17, 18) are adjacent to each other.

6. The blade (10) according to any one of claims 3 to 5, characterized in that The plurality of pattern areas (8, 9) include: A first pattern area (8) of blade teeth and pulp stop; a second pattern area (9) of the teeth and the blade stop, wherein the orientation of the second pattern area (9) is different from the orientation of the first pattern area (8), wherein the first pattern area (8) and the second pattern area (9) are positioned side by side relative to each other to cover at least a portion of the refining surface (14); and one or more connecting blade teeth (82) and / or connecting paddle stops (84), wherein the one or more connecting blade teeth (82) and / or connecting paddle stops (84) connect the corresponding blade teeth and / or paddle stops of the first pattern area (8) and the second pattern area (9), The blade tooth group (17, 18) of the first pattern area (8) does not overlap with the blade tooth group (17', 18') of the second pattern area (9).

7. A blade (10) according to any one of the preceding claims, characterised in that: The plurality of teeth (20) are arranged such that movement along the plurality of tooth axes (230, 240, 250, 260) from the outer periphery (12) to the inner periphery (11) is also movement along a first circumferential direction (D); and / or The plurality of paddle blocks (30) are arranged such that movement from the inner periphery (11) to the outer periphery (12) along corresponding paddle block axes (410, 420) of the plurality of paddle blocks (30) is also movement along the first circumferential direction (D), the plurality of paddle block axes comprising the first paddle block axis (410) and the second paddle block axis (420).

8. A blade (10) according to any one of the preceding claims, characterised in that The first slurry stopper (41) is closer to the outer peripheral edge (12) than the second slurry stopper (42).

9. The blade (10) according to any one of claims 1 to 7, characterized in that The second slurry stopper (42) is closer to the outer peripheral edge (12) than the first slurry stopper (41).

10. A blade (10) according to any one of the preceding claims, characterised in that The blade tooth section (44) comprises a first lateral edge (61) and a second lateral edge (62) opposite to the first lateral edge (61), wherein: The first lateral edge (61) is at least partially offset relative to the first tooth axis (230) compared to a corresponding lateral edge of a remainder (46) of the first tooth (23); or The second lateral edge (62) is at least partially offset relative to the first tooth axis (230) compared to a corresponding second lateral edge of a remainder (46) of the first tooth (23).

11. The blade (10) according to claim 10, characterized in that The first slurry stop (41) extends from the first lateral edge (61); The second slurry stop (42) extends from the second lateral edge (62); When the first lateral edge (61) is offset, the second paddle stop (42) is closer to the outer peripheral edge (12) than the first paddle stop (41); and When the second lateral edge (62) is offset, the first paddle stop (41) is closer to the outer peripheral edge (12) than the second paddle stop (42).

12. A blade (10) according to any one of the preceding claims, characterised in that When viewed from a direction perpendicular to the blade (10), the blade tooth section (44) has a triangular shape.

13. A blade (10) according to any one of the preceding claims, characterised in that The tooth segment (44) includes an inner end (54) closest to the inner periphery (11) and an outer end (55) closest to the outer periphery (12), wherein the width of the tooth segment (10) at the inner end (54) is greater than the width of the tooth segment (10) at the outer end (55).

14. A blade (10) according to any one of the preceding claims, characterised in that When viewed from a direction perpendicular to the blade (10), the blade tooth section (44) has a rectangular shape.

15. A blade (10) according to any one of the preceding claims, characterised in that When viewed from a direction perpendicular to the blade (10), the blade tooth section (44) has one of an angled shape, a concave arc shape, a convex arc shape, a concave shape, and a convex shape.

16. A blade (10) according to any one of the preceding claims, characterised in that: Each of the plurality of tooth axes (230, 240, 250) does not intersect another tooth axis of the plurality of tooth axes (230, 240, 250) in the fine grinding portion (14); and / or Each of the plurality of tooth axes (410, 420) does not intersect another tooth axis of the plurality of tooth axes (410, 420) within the refining portion (14).

17. A refiner (1) for refining lignocellulosic material, comprising at least one blade (10) according to any one of the preceding claims.

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