巴西专利BR112014000734B1 refining plate and refining plate segment for a mechanical refiner of lignocellulosic material

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专利摘要:
ROTOR ELEMENT OF THE REFINERING PLATE FOR CONTRARROTIVE REFINER HAVING CURVED BARS AND MAIN SERRATED EDGES. The present invention relates to a segment of the refining plate (10) for a mechanical refiner of lignocellulosic material including: a refining surface on a substrate, where the refining surface faces a refining surface of an opposite refining plate , the refining surface including bars (18) and grooves (22) between the bars (18), in which an angle (20) of each bar (18) with respect to a radial line corresponding to the bar increases at least 15 degrees by along a radially external direction, and the angle (20) is a retention angle in a range of 10 to 45 degrees at the periphery of the refining surface, and each of the bars (18) includes a main sidewall having a irregular surface, where the irregular surface includes protrusions that extend externally from the side wall towards a side wall in an adjacent bar (18).
公开号:BR112014000734B1
申请号:R112014000734-9
申请日:2012-07-13
公开日:2020-12-22
发明作者:Luc Gingras
申请人:Andritz Inc；
IPC主号:

专利说明:

RELATED REQUESTS
[0001] This order claims the benefit of order number 13 / 547,144 filed on July 12, 2012 and order number 61 / 507,450 filed on July 13, 2011, which are incorporated in their entirety as a reference . BACKGROUND OF THE INVENTION
[0002] The present invention relates to disc refiners for lignocellulosic materials, such as disc refiners used to produce mechanical pulp, thermomechanical pulp and a variety of chemothermomechanical pulps (collectively referred to as mechanical pulp and mechanical pulping processes).
[0003] In counter-rotating refiners used in mechanical pulping processes, the raw material, typically wood or other lignocellulosic material (collectively referred to as wood chips), is fed through one of the refining discs and propelled outward by a strong force centrifuge created by the rotation of one or both rotor discs. The refiner plates are mounted on each opposite side of the refining discs. The wood chips move between the plates of the refiner that oppose each other in a direction generally radial to the outer perimeter of the plates and the disc.
[0004] Refining discs conventionally operate at rotational speeds of 1200 to 1800 revolutions per minute (RPM). While the wood chips are between the discs, energy is transferred to the material through the refiner plates attached to the discs. The refiner plates usually have a pattern of bars and grooves, as well as closures, which together provide repeated compression and shearing actions on the lignocellulosic fiber material. The compression and shearing actions that act on the material separate the lignocellulosic fibers from the raw material, provide a certain amount of development or fibrillation of the material and generate an amount of cut in the fiber that is usually less desirable. The separation and development of the fiber is necessary to transform the raw wood chips into a suitable wood sheet or fiber component for papermaking.
[0005] In the mechanical pulping process, a large amount of friction occurs between the wood chips and the refiner's plates. This friction reduces the energy efficiency of the process. It has been estimated that the energy efficiency applied in mechanical pulping is in the range of 10 percent (%) to 15%.
[0006] Efforts to develop refiner slabs that work with greater energy efficiency, for example, less friction, have been achieved and typically involve the reduction of the operational gap between the disks. Conventional techniques to improve energy efficiency typically involve design features on the front face of the refiner plate segments that normally speed up the process of feeding wood chips through the refining zone (s) on the refiner plates. These techniques often result in reducing the thickness of the fibrous suspension formed by the wood chips that flow between the refiner plates. When energy is applied by the refiner's plates to a finer fibrous suspension, the compression rate applied to the wood chips is higher for a given energy input and results in a more efficient use of energy in refining the wood chips.
[0007] Reducing the thickness of the fibrous suspension allows for smaller operational gaps, for example, the space between the opposite refiner plates. The reduction in space can result in an increase in the cutting of wood chip fibers, a reduction in the strength properties of the pulp produced by the disks, an increased wear rate of the refiner plates and a reduction in the operational life of the refiner plates. The operational life of the refiner plate reduces exponentially while the operational gap is reduced.
[0008] Energy efficiency is believed to be the greatest towards the periphery of the refining discs. The relative speeds of the refining plates are higher in the peripheral region of the plates. The refining bars on the refining plates intersect with each other on the opposite plates at a higher speed in the peripheral regions of the refining plates. The higher crossing speed of the refining bars is believed to increase the refining efficiency in the peripheral region of the plates.
[0009] Wood fibers tend to flow quickly through the peripheral region of the refining slabs. The speed of the fibers in the peripheral region is due to centrifugal forces and forces created by the continuous flow of steam generated between the discs. The brevity of the retention period in the peripheral region limits the amount of work that can be done on that most efficient part of the refining surface. BRIEF DESCRIPTION OF THE INVENTION
[00010] Designing the refining plates to move more energy input towards the periphery of the refining zone (s) should increase the total refining efficiency and reduce the energy consumed to refine the pulp. By changing the energy input to the periphery of the refining zone (s), a larger operational gap between the refining plates may be sufficient to provide a long operating life for refining plates.
[00011] A new refining plate was designed that, in one mode, has improved energy efficiency and allows for a relatively large operational gap between the discs. Energy efficiency and a large operational gap can provide reduced energy consumption to produce pulp, a high quality of pulp fiber produced and a long operational life for the refining plate segments.
[00012] In one embodiment, the refining plate is a set of rotor plate segments having an external refining zone with bars that have at least one radially external section with a curved longitudinal shape and main side walls with wall surfaces that are jagged, serrated or otherwise irregular. The curved bars and the resulting curved grooves between the bars increase the retention time of the wood chip feed material on the outside and thereby increase the refining of the material on the outside. In addition, the toothed surfaces on the main side walls also act to increase the retention time of the feed material in the external area.
[00013] A refining plate was designed with a refining surface facing another plate, the refining surface includes a plurality of bars rising from the surface, the bars extending outwards towards an outer peripheral edge of the plate, the bars have a jagged or uneven surface at least on the main side wall of the bars and they are curved, such as with an exponential or involute arc. The refining plate can be a rotor plate and is arranged in a refiner opposite to another rotor plate.
[00014] A segment of the refining plate was designed for a mechanical refiner of lignocellulosic material comprising: a refining surface on a substrate, where the refining surface is adapted to be returned to a refining surface of an opposite refining plate, the refining surface including bars and grooves between the bars, where an angle of each bar to a radial line corresponding to the bar increases at least 10 to 15 degrees along a radially external direction, and the angle is a retention angle in any of a range of 10 to 45 degrees, 15 to 35 degrees, 15 to 45 degrees and 20 to 35 degrees at the periphery of the refining surface, and each of the bars includes a main sidewall having an uneven surface in that the irregular surface includes protrusions extending out of the side wall towards a side wall in an adjacent bar and the irregular surface extends from the outer periphery or close to the surface of refining, extends radially inward along the bars without reaching a surface entrance to the refining.
[00015] The bars may each have a longitudinal curved shape with respect to a radial of the plate extending through the bar. The angles can increase continuously and gradually along the radially outward direction or in steps along the radially outward direction. At the entrance radially inward to the refining surface, the bars can each be arranged at a maximum angle of 10, 15 or 20 degrees from a radial line corresponding to the bar. In addition, the segment of the refining plate can be adapted for a rotating refining disc and to face a rotating refining disc when mounted on a refiner.
[00016] The refining surface can include multiple refining zones, where a first refining zone has relatively wide bars and grooves, wide and a second refining zone has relatively narrow bars and grooves, and the second refining zone is radially in the plate segment of the first refining zone, at which retention angle for the second refining zone can be in any one of a range of degrees from 10 to 45, from 15 to 45 and 20 to 35.
[00017] The uneven surface on the main side wall of the bars may include a series of ramps, each having a lower edge in the substrate of each groove, extending at least partially to the main side wall.
[00018] A refining plate was designed for a mechanical refiner of lignocellulosic material comprising: a refining surface on a substrate, where the refining surface is adapted to be turned to a refining surface of an opposite refining plate, and the surface of refining including bars and grooves between the bars, where the bars have at least one radially external section having an angle of each bar, with respect to a corresponding radial line at the bar inlet between 10, 15 or 20 degrees of the radial line and is an angle of retention in a range of degrees from 10 to 45, 15 to 35, 15 to 45 and 20 to 35, on an outer periphery of the bars, where the angle increases at least 10 to 15 degrees from a radially internal entrance from the bars to the outer periphery, and the bars each include a side wall having an irregular surface in a radially external section where the irregular surface includes protrusions extending out of the side wall towards a side wall on an adjacent bar and the irregular surface extends from or near the outer periphery of the refining surface extends radially inward along the bars, without reaching an entrance to the refining surface.
[00019] A segment of the refining plate was designed for a mechanical refiner of lignocellulosic material comprising: a refining surface on a substrate, where the refining surface is adapted to face a refining surface of an opposite refining plate; the refining surface including bars and grooves between the bars, where each bar is at an angle to a radial line corresponding to the bar and the angle at the entrance to the bars is at least 10, 15 or 20 degrees from the radial line, the angle increases at least 10 to 15 degrees in a radially external direction along the bar, and the angle is in a range of degrees from 10 to 45, 15 to 45, 15 to 35 or 20 to 35 on the periphery of the refining surface , and where each of the bars includes a main side wall having an irregular surface, where the irregular surface includes protrusions extending out of the side wall towards a side wall in an adjacent bar and the irregular surface extends da, or near the outer periphery of the refining surface, extends radially inward along the bars without reaching an entrance to the refining surface. BRIEF DESCRIPTION OF THE DRAWINGS
[00020] Figure 1 is a side view of a first segment of the refining plate.
[00021] Figure 2 is a front view of the first segment of the refining plate.
[00022] Figures 3 and 4 are side and front views, respectively, of a second segment of the refining plate.
[00023] Figures 5 and 6 are side and front views, respectively, of a third segment of the refining plate.
[00024] Figure 7 is an enlarged view of an example of a toothed side wall of a bar in a segment of the refining plate.
[00025] Figure 8 is a front view of another segment of the refining plate.
[00026] Figures 9 to 12 each show a top-down view of an example of an irregular surface on a main side wall of a bar in the external refining zone in a segment of the refining plate.
[00027] Figure 13 is a cross-sectional diagram of a refining bar having an uneven surface on the main side wall of the bar.
[00028] Figure 14 is a front view of the main side wall of the bar shown in figure 13. DETAILED DESCRIPTION OF THE INVENTION
[00029] The refining process applies a cyclic compression to a fibrous suspension formed from wood chips moving in the operational gap between discs of a mechanical refiner. The energy efficiency of the refining process can be improved by increasing the compression rate of the fibrous suspension and reducing the percentage of refining energy applied at lower compression rates, such as in radially internal portions of the refining zone. The increased compression ratio is achieved with the rotor plate designs described in this application, without necessarily reducing the operational gap to the same level as with conventional high-energy refining plates.
[00030] A relatively large operational gap between the rotor and the stator plates in a refiner (compared to the narrow gap in highly energy efficient refiners) results in a thicker slurry suspension formed between the plates. A high compression ratio is achieved with a thick slurry suspension using a significantly thicker refining plate, compared to conventional rotor plates used in similar high energy efficiency applications.
[00031] A thicker refining plate has relatively few bars compared to a thinner refining plate, typically used in highly energy efficient refiners. The lower number of bars on a thicker refining plate reduces the compression cycles applied while the bars on the rotor pass through the bars on the stator. The energy being transferred in a few compression cycles increases the intensity of each compression and shear event and increases energy efficiency.
[00032] The designs of the rotor refining plate described in this order achieve high fiber retention and high compression, to provide high energy efficiency while preserving the length of the fiber and improving the life of the refining plates. These designs are to be used in counter-rotating refiners, where similar designs would work on both rotor discs.
[00033] A refining plate was designed with a configuration of relatively thick bars and grooves, and other characteristics, to provide a long retention time for the fibrous suspension in the effective refining zone in a peripheral region of that zone. These characteristics concentrate the refining energy in the surface area towards the periphery of the refining surface, together with a lower number of bar crossings (less compression events) and a much longer retention time for the raw material. , caused by the specific design of the rotor elements or rotor plates of the refiner. This results in a high compression ratio of a thick fiber layer, thereby maintaining a greater operational gap. Instead of reaching high intensity by reducing the amount of fibers between the opposite plates, high intensity compressions are achieved by reducing the number of crossbar events and increasing the amount of fiber present in each crossbar.
[00034] The refining plates described in this application may have curved bars with jagged main side walls, at least in the peripheral region of the refining zone. The curvature and the main jagged side walls of the bars reduce the fibrous layer and thereby increase pulp retention in the peripheral region of the refining zone. The increased retention period allows more energy to enter the refiner's periphery, where the energy to enter the slurry is more efficient.
[00035] Figures 1 and 2 show a side view and a front view, respectively, of a segment of the rotor plate 10 having the inlet section 12 and an outer section 14. A table of plate segments is arranged in a ring to form a circular refining plate. The plate segments 10 are mounted as a plate for a disc 11. In a disc refiner, the rotor plate faces another rotor plate with a refining gap between the plates. The opposite rotor plate is also formed of plate segments that may have bar and groove characteristics similar to the first rotor plate segment, or may have other bar and groove characteristics. The direction of rotation (arrow 16) for the rotor plate is counterclockwise.
[00036] The outer section 14 of the refining plate segment is the area where the energy will be applied to refine the wood chip feed material. The outer section should preferably be a radial distance between 100 mm (mm) to 200 mm. The outer section can be comprised of curved bars 18 which form a gradual, or gradually increasing, angle with a radial line corresponding to the bar. At the inner end of each bar 18, the angle 19 between the bar and a radial line can be zero or a few degrees, for example, a maximum of 0, 15 or 20 degrees. The direction of the entry angle of the bar 18 can be a feed or hold direction.
[00037] The feed and retention angles are the angles that a bar 18 forms in relation to the relative movement of the plates. A feed angle is an angle of a radial line in the direction opposite to the rotation of the rotor plate, for example, counterclockwise, as indicated by the arrow 16. A holding angle is an angle of a radial line corresponding to the bar and extends in the direction of rotation of the rotor plate. A feed angle is an angle of a radial line corresponding to the bar and extends in a direction opposite to the rotation of the plate.
[00038] At the radially outer end of the bar, the exit angle of the bar 20 can be a retention angle in a range of degrees from 10 to 45, 15 to 35, 15 to 45 or 20 to 35. The retention angle also can be increased by providing a step modification of the bar angle by forming each bar as a series of sections of straight bars having different angles.
[00039] The grooves 22 are between the bars and are defined by the trailing side wall 24 and the main side wall 26 of the adjacent bars. The main side wall faces the rotational direction of the rotor plate. In figure 2, the main side wall is on the left side (L) of each bar. The slots provide passages through which the feed material, steam and other materials can move radially across the plates.
[00040] The height of the bars, for example, the distance from the front surface of the plate substrate to the upper crest of the bars can be initially connected and transition at a uniform height for most of the length of the bars. The initial taper of the bars facilitates the feeding of the material in the outer section 14.
[00041] In the plate segment 10, the entry angle is neutral, for example, approximately zero degrees with respect to a radial line. At the outer periphery 30 of the plate segment, the exit angle 20 of the bars 18 can be a retention angle in one of the ranges of 10 to 60 degrees, 10 to 45 degrees, 20 to 30 degrees and 15 to 35 degrees .
[00042] The angle of the bars 18 gradually increases from the entrance to the exit in an angular direction aligned with the rotation of the rotor plate. In the rotor plate segment 10, the angle slowly increases near the entrance. The rate of angle modification gradually increases as the bar advances towards the outer periphery 30 of the plate. The increase in the angle of entry to the periphery of the refining zone can be at least a 10 to 15 degree increase. The angles of the bar can increase in an exponential arc or an involute arc.
[00043] The high retention angles 20 of the bars in the outer portion of the refining zone, for example, the outer section 14, contribute to the high retention of the feed material between the plates and the increased retention time of the feed material in the outside the refining zone, as indicated by the outer section 14.
[00044] The high retention angles, for example, from 10 to 45 degrees and the toothed surface on the main side walls of the bars can be confined to the external region of the refining zone. The external region can be 80% to 20% external to the refining zone.
[00045] The retention of the feed material on the outside of the refining zone is aided by the toothed surface of the main side walls 26 of the bars. The toothed surface may extend to the full height of each bar or be confined to the upper or fourth part of each bar. The surface of the trailing side walls 24 can be smooth. An uneven surface on a trailing sidewall can be combined with the uneven surface on the main sidewall of the bars. The width of the bars varies due to the variable gap between the toothed surface on the main side wall 38 and the smooth surface of the trailing edge 30.
[00046] The toothed surfaces applied to the main side walls 26 of the exit bars can be of the following patterns: zigzags, serrations, saw teeth, semicircles or any form that provides increased longitudinal friction to prevent easy sliding of the feed material to the along the leading edge of the bars. The toothed surface may only be in an upper region of the main side wall. Below the toothed surface, the main sidewall can be smooth. The side wall surface below the toothed surface can be straight, conical or have ramps that extend through the groove to, or towards the trailing edge of the adjacent bar.
[00047] The serrated pattern does not have to start at the entrance to the refining zone. The serrated portion may start radially out of the entrance to the bar and extend along the bar to periphery 30 or its vicinity. The smooth main side wall at the inlet portion of the bars allows easy feeding of the fibrous suspension into the refining zone. The surface of the serrated main side wall reduces the movement of the feed material through the radially outer portions of the outer section 14 and thereby increases the pulp retention time near the periphery of the plates. The increased retention time allows more refining energy to be applied to the pulp, in the peripheral portion of the refining zone.
[00048] Figures 3 and 4 show a side view and a front view, respectively, of a plate segment 34 having bars 36 with a serrated main side wall 38 which appears in a top-down view as a series of numbers seven (“7”) arranged from end to end. The corners formed by the series of sevens can be rounded to facilitate the production and molding of the plate segments. The main toothed side wall can extend the entire length of the bar or can extend only a radially outer portion of the bar.
[00049] In addition, the main toothed side wall can be connected from the ridge 40 towards the root (on the substrate surface of the plate 42) of the bars, so that the toothed feature is more prominent in the upper corner of the main side wall of the bar where most of the refining takes place and becomes less significant while the one moves deeper into the groove.
[00050] Ramps lead to the recesses of the jagged edges. Such ramps may also extend slightly in the grooves so that they improve the efficiency of the pulp rising by moving into the gap, for further refining.
[00051] The surface characteristics of the jagged edge on the main side wall 38 may vary in size and shape. Preferably, the external protrusions of the serrated corners, for example, points in the form of saw teeth and corners in a series of “7”, are spaced from each other, approximately, from 3 mm to 8 mm, along the edge of bar (length). The protrusions of the characteristics of the toothed edge surface have a depth preferably between 1.0 mm to 2.5 mm, where the depth extends towards the bar width. The depth of the protrusions can be limited by the width of the bars. A bar 36 typically has an average width of approximately 2.5 mm and 6.5 mm. The bar width varies due to the surface characteristics of the jagged edge, particularly the protrusions, on the main side wall. The grooves in the outer section 14 are relatively wide in the inner refining zone 44 and narrow in the outer refining zone 46.
[00052] The plate segment 34 has the entry section 12, for example, a break bar area, with bars having a slight curvature and generally aligned along radial lines at the periphery of the entry section. The outer section 14 includes an inner refining zone 44 and an outer refining zone 46. The bars in the inner refining zone are thicker and fewer in number than the bars in the outer refining zone.
[00053] Inlet section 12 includes stepped bars that break large particles of feed material and guide the feed material into the grooves of the outer section 14. The inner refining zone 44 of the outer section 14 receives the feed material from the section input. The bars 37 in the internal refining zone 44 can be aligned with a radial line corresponding to the bar at the entrance to the bar, which is a zero degree return or hold angle. The inner refining zone 44 refines the wood chips and provides partially refined wood chips at the entrance of the outer refining zone 42. The partial refining of the wood chips helps in feeding chips to the outer refining zone 46 which has thin bars 36 and narrow grooves.
[00054] Multiple refining zones arranged in successive annular regions of the refining plate allow the wood chips and fibers to be initially refined by a thick bar and groove arrangement and successively refined by increasingly thinner bar and groove arrangements. The external refining zones with thin bar and groove patterns are suitable for producing high quality pulp, which typically requires high energy compression and shear forces to be applied by the refining zones. To ensure that fibers are retained in the outer refining zones with the thin bar and groove patterns, the bars in the outer zone can have a relatively high retention angle, for example, from 10 degrees to up to 45 degrees, and jagged surfaces on the main side walls of the bars. The trailing surfaces of the bars can be smooth, but optionally they can also be toothed or other uneven surface.
[00055] The inner section of each bar in the inner or outer refining zone may have a slit in the crest that functions as a fine groove. The fine groove is in addition to the grooves between adjacent bars. The fine groove can discharge through a crossing groove that opens to the main sidewall in a position on the bar, radially into the notched section of the main sidewall.
[00056] The toothed surface 38 of the main side walls in the internal and external refining zones need not extend the entire length of the bar. Also, the toothed surface 38 of the different bars in each refining zone 44, 46 does not have to cover the same portion of each bar.
[00057] The inlets of the innermost radial bars or portions of the main toothed side walls may be at a common radial distance on the refining plate, as shown in figures 2 and 4. Alternatively, the entrance to the bars or the beginning of the jagged side walls it can form a Z-pattern, as shown in the outer refining zone 46. In the radially inward portion of each Z-pattern, the adjacent bars can be joined at its entrance, such that a half-height closure 48 is formed. If the bar entries are in a common radius, form a Z pattern or have another arrangement, it can be selected based on the requirements for the refining plate. Similarly, the start pattern of the toothed side wall, for example, a Z pattern, the common radial line or the multiple bar steps (see bars 86 in fig. 8), can be selected based on the requirements of the refining plate.
[00058] The plate segment 34 has thick jagged surfaces on the main side walls of the bars in the internal refining zone 44, where the term coarse refers to the frequency of protrusions on the toothed surface. In contrast, the external refining zone has a fine toothed surface on the main side wall. The roughness of the toothed surface depends, in part, on the thickness of the bars and the number of bars in the refining zone.
[00059] Plates having two or more annular refining zones, such as zones 44 and 46, can be used to produce high quality pulp. High-quality pulp can be produced using thin bars and narrow grooves, which apply great compression and shear forces to the fibers. Thin bars and narrow grooves may not be suitable for refining whole wood chips or large particles of material. The internal refining zone (s) refine the entire wood chips and large particles of the fiber pulp material that can be processed through the refining zones with thin bars and narrow grooves.
[00060] The thin bars with narrow grooves in the outer radial regions of the refining plate transmit great forces of compression and shear to the pulp, to produce high quality pulp. The curvature of the bars and the surfaces of the main toothed side wall in the outer radial refining region, for example, the outer third of the refining zone, increases the fiber retention period in the outer refining zone. The increased retention allows additional work to be transmitted to the fibers through the external refining zone. Because of the external refining zone and the amount of pulping work carried out in the outer zone, the gap between the opposing rotor plates need not be as small as used in certain conventional refiners, where a narrow gap between the plates is used to increase the work applied to wood chips.
[00061] Figures 5 and 6 show a side view and a front view, respectively, of a segment of the rotor refining plate 50. The grooves 52 separating the bars 54 in the refining zone 56 can have a surface combination (full height) ) closing 58, subsurface or half closing height 60 or not having any closing, depending on the general combination of the plate design and the operating conditions for the refining plate.
[00062] Figure 7 shows a modality of the toothed surface 62 on the main side wall of the bars. The toothed surface 62 can be formed of repeating protrusions, having a first consecutive straight sidewall 64, a second consecutive straight sidewall 66 and a curved sidewall 68 between the first and second sidewalls. An inclined ramp 72 extends from substrate 70 (at the bottom of the groove) to the bottom edge of the second side wall 66. The top edge of the second side wall 66, the inner corner 68 and the first side wall 64 are on the ridge 52 at the top the bar. The first and second side walls can be substantially perpendicular to each other or can form an angle in the range of 45 degrees to 120 degrees. Alternatives to the ramp include: the ramp 72 that extends to the crest 52 of the bar, where the ramp may have a lower edge above the substrate at the bottom of the groove or that does not include the ramp 72.
[00063] The sloping surface 72 extending from the substrate increases or raises the fiber out of the groove and moves the fiber to the upper regions of the bars, where most of the refining is carried out. The length and angle of the inclined surface 72 is dependent on the desired extent of the dimension of the toothed surface, and the selected angle and length for the inclined surface.
[00064] Figure 8 is a front view of a plate segment 80 having an internal refining zone 82 and an external refining zone 84. The bars 86 in the external refining zone 84 are each arranged in parallel to a respective radial line or are arranged at a small feed or hold angle, such as within 10 or 5 degrees of a radial line. The bars 86 are curved such that at their outer radial end they form a retention angle of 10 to 45 degrees. The entrance to the bars 86 in the outer refining zone can form a Z-shaped pattern and the radially inner portion of each of the surfaces of the toothed sidewall forms a pattern of stages of groups of three bars.
[00065] The bars 88 of the internal refining zone 82 have an entry angle of zero, can be straight or curved to gradually form a slight retention angle, for example, from 5 to 15 degrees, at the time of transition between the zones internal and external refining facilities. The toothed surface on the main side wall of the bars 88 in the inner refining zone is optional and can be substantially thicker than the toothed surface on the radially outer bars 86. Alternatively, the thickness of the toothed surface can be uniform throughout the plate. In addition, the toothed surface may be thinner in the outer refining zone than in the inner refining zone. A half-height closure 90 can be positioned in the grooves of the internal refining zone.
[00066] Figures 9 to 12 are each a top-down view of the ridge 126 and, in particular, the profile of the irregular surface in a main side wall of a bar in the external refining zone of a segment of the refining plate . The upper ridge 126 of each bar 120 includes a profile of the upper corner of the main side wall 128 and the trailing side wall 130. The main side wall has an irregular surface, for example, a serrated feature, which can be more pronounced in the corner upper side wall. The irregular characteristics of the surface of the main side walls 128 can be confined to the outer radial portions of the bar, but can extend to the entire length of the outermost refining zone or the entire refining zone.
[00067] The characteristics of uneven surfaces can take a variety of shapes, including the series of "7" s shown in figure 9, the sawtooth characteristic shown in figure 10, the series of concave grooves in the main side wall, such as shown in figure 11 and a series of teeth, for example, rectangular teeth, as shown in figure 12. The shape of the irregular characteristics is a matter of design preference and may depend on the feed material and composition of the plate segment and manufacturing considerations and molding.
[00068] Figure 13 shows, in the cross section, a bar 120 having a smooth trailing sidewall 130 and an irregular surface, for example, series of "7" s, on the main sidewall 128. Figure 14 shows in a front view the same uneven surface feature on the main sidewall bar as shown in figure 3. The uneven surface feature may be more pronounced on the sidewall of the bar, near the crest of bar 126, where most of the refining occurs. The uneven surface characteristic may become progressively less pronounced on the side wall of the bar towards the substrate of the plate 122. The protrusions 176 of the uneven surface tend to delay the movement of the food material through the grooves and thereby increase the time retaining the feed material in the plate refining zone (s). Protrusions 176 can be connected from crest 126 to substrate 122. Near substrate 122 of the plate, protrusions can blend into a smaller smooth (curved) surface 78 of main side wall 128.
[00069] Curved bars, jagged surfaces of the main side walls of bars and retention angles of 10 to 45 degrees can be applied to plate segments on one or both opposing disks in a refiner.
[00070] While the invention has been described in relation to what is presently considered to be the most practical and preferred modality, it is to be understood that the invention should not be limited to the described modality, but, on the contrary, it is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the added claims.

权利要求:
Claims (40)
[0001]
1. Segment of refining plate for a mechanical refiner of lignocellulosic material characterized by the fact that it comprises: a refining surface on a first substrate, where the refining surface is adapted to face a second refining surface in a second substrate of an opposite refining plate, the refining surface including bars and grooves between the bars, in which an angle of each bar in relation to a radial line corresponding to the bar, increases at least 15 degrees along a radially external direction and the angle is a retention angle in a range of 10 to 45 degrees at the periphery of the refining surface, and where each of the bars includes a side drag wall extending from an upper surface of the bar to the first substrate, in that a smooth surface extends the length of the trailing sidewall; wherein each of the bars includes a main sidewall having an irregular surface, where the irregular surface includes protrusions extending externally from the side wall towards a side wall in an adjacent bar and the irregular surface extends inwardly along the bars, without reaching an entrance to the refining surface; wherein each protrusion includes a first surface extending from the first substrate towards a top of the bar with the protrusion and a second surface extending from the first surface to the top of the bar, where an inclination of the first surface in relation to the first substrate is less than a slope of the second surface, where each protrusion includes a corner formed at an interface of the first surface, of the first substrate, of a third surface extending from an edge of the first surface to the first substrate, and in which the third surface forms an oblique angle in relation to the side dragging wall of the bar so that the third surface and the corner associated with the third surface project obliquely from the main side wall in the groove.
[0002]
2. Refining plate segment, according to claim 1, characterized by the fact that each of the bars has a longitudinal shape curved in relation to a radial of the plate extending through the bar.
[0003]
3. Refining plate segment, according to claim 1, characterized by the fact that the retention angle increases continuously and gradually along the radially external direction.
[0004]
4. Refining plate segment, according to claim 1, characterized by the fact that the angle increases in stages along the radially external direction.
[0005]
5. Refining plate segment, according to claim 1, characterized by the fact that at an entry radially into the refining surface, the bars are each arranged at an angle within 10 to 20 degrees of a radial line corresponding to the bar.
[0006]
6. Refining plate segment, according to claim 1, characterized by the fact that the refining plate segment is adapted for a rotating refining disc and to face a rotating refining disc when mounted on a refiner.
[0007]
7. Refining plate segment, according to claim 1, characterized by the fact that the refining surface includes multiple refining zones, in which a first refining zone has relatively wide bars and relatively wide grooves and a second refining zone it has relatively narrow bars and relatively narrow grooves, and the second refining zone is radially external in the plate segment of the first refining zone.
[0008]
8. Refining plate segment, according to claim 7, characterized by the fact that the retention angle refers to the bars of the second refining zone.
[0009]
Refining plate segment according to claim 1, characterized by the fact that the uneven surface includes a series of ramps, each extending at least partially to the main side wall.
[0010]
10. Refining plate segment according to claim 1, characterized by the fact that the uneven surfaces of the side walls of the bars include a thick uneven surface on the side walls and a thin uneven surface on the side walls, and the thick uneven surfaces are radially internal or external of the thin uneven surfaces.
[0011]
11. Refining plate segment according to claim 1, characterized by the fact that the irregular surface is along a radially external portion of the bar and the bars include a smooth surface along a radially internal portion of the bar, the bars are arranged in groups of three or more bars and in each group the bars extend from a first bar to a last bar in a direction opposite to a rotational direction of the mechanical refiner, and in each group, the irregular surface the main side wall of each of the bars extends more radially internally than the next bar in the group in a direction opposite to a direction of rotation of the mechanical refiner, except for the last bar in the group that has the irregular surface extending more radially than other bars in the group.
[0012]
12. Refining plate for a mechanical refiner of lignocellulosic material characterized by the fact that it comprises: a first refining surface on a first substrate, where the refining surface is adapted to face a second refining surface of an opposite refining plate , and the first refining surface includes bars and grooves between the bars, where each of the bars includes a trailing side wall extending from an upper surface of the bar to the first substrate, where the trailing side wall has a smooth surface along the length of the trailing sidewall; where the bars have at least one radially external section having an angle of each bar in relation to a corresponding radial line and where the angle at the entrance of the bar has a range of 10 to 20 degrees from the radial line and where the angle is known as a retention angle, where the retention angle has a range of 10 to 45 degrees on an outer periphery of the bars, where the angle increases at least 10 to 15 degrees from a radially internal entrance of the bars to the outer periphery and each of the bars includes a main sidewall having an irregular surface, the irregular surface including protrusions extending externally from the main sidewall towards a trailing sidewall on an adjacent bar and the irregular surface extends radially internally along the bars, without reaching the entrance to the bars entrance, where each protrusion includes a first surface if and extending from the first substrate towards a top of the bar with the protrusion, a second surface extending from the first surface to the top of the bar and a third surface extending from an edge of the first surface to the first substrate , where an inclination of the first surface in relation to the substrate is less than an inclination of the second surface, and where each protrusion includes a corner formed at the interface of the first surface, the third surface and the substrate, and where the the third surface forms an oblique angle with respect to the trailing sidewall so that the third surface and the corner associated with the third surface protrude obliquely from the main sidewall in the groove.
[0013]
13. Refining plate according to claim 12, characterized by the fact that each of the bars has a longitudinal shape curved in relation to a radial of the plate extending through the bar.
[0014]
14. Refining plate, according to claim 12, characterized by the fact that the retention angle increases continuously and gradually along the radially external direction.
[0015]
15. Refining plate, according to claim 12, characterized by the fact that the angle increases in stages along the radially external direction.
[0016]
16. Refining plate according to claim 12, characterized by the fact that at a radially internal entrance to the refining surface, the bars are each arranged at an angle within 10 to 20 degrees of a radial line corresponding to the bar.
[0017]
17. Refining plate according to claim 12, characterized by the fact that the segment of the refining plate is adapted for a rotating refining disc and to face a rotating refining disc when mounted on a refiner.
[0018]
18. Refining plate, according to claim 12, characterized by the fact that the protrusions of the irregular surface form a pattern that is at least one among zigzag, sawtooth, series of impacts, sinusoidal, and a lateral Z pattern .
[0019]
19. Refining plate according to claim 12, characterized in that the protrusions on the irregular surface vary the width of the bar by at least one fifth of the width of the bar along the portion of the bar having the side wall with the irregular surface .
[0020]
20. Refining plate according to claim 12, characterized in that the refining surface includes an external refining surface having a higher density of bars than a density of bars in an internal refining section.
[0021]
21. Refining plate according to claim 12, characterized in that the protrusions of the irregular surface are more pronounced at an upper edge of the side wall and are less pronounced near a substrate of the plate.
[0022]
22. Refining plate according to claim 12, characterized by the fact that the refining surface includes multiple refining zones, in which a first refining zone has relatively wide bars and relatively wide grooves and a second refining zone has bars relatively narrow and relatively narrow grooves, and the second refining zone is radially external in the plate segment of the first refining zone.
[0023]
23. Refining plate, according to claim 22, characterized by the fact that the retention angle refers to the bars of the second refining zone.
[0024]
24. Refining plate according to claim 12, characterized by the fact that the uneven surface includes a series of ramps extending at least partially to the main side wall.
[0025]
25. Refining plate according to claim 12, characterized in that the uneven surfaces of the side walls of the bars include a thick uneven surface on the side walls and a thin uneven surface on the side walls, and the thick uneven surfaces are radially internal or external surfaces of thin uneven surfaces.
[0026]
26. Refining plate segment according to claim 12, characterized in that the irregular surface is along a radially external portion of the bar and the bars include a smooth surface along a radially internal portion of the bar, the bars are arranged in groups of three or more bars and in each group the bars extend from a first bar to a last bar in a direction opposite to a rotational direction of the mechanical refiner, and in each group, the irregular surface of each of the bars extends more radially internally than the next bar in the group in a direction opposite to a direction of rotation of the mechanical refiner, except for the last bar in the group that has the irregular surface extending more radially internally than others group bars.
[0027]
27. Segment of refining plate for a mechanical refiner of lignocellulosic material characterized by the fact that it comprises: a refining surface on a substrate, where the refining surface is adapted to face a refining surface of an opposite refining plate; the refining surface including bars and grooves between the bars, where each of the bars includes a trailing side wall extending from an upper surface of the bar to the substrate, where the trailing side wall has a smooth surface along the length of the side drag wall; where each bar is at an angle to a radial line corresponding to the bar, and the angle at the entrance to the bars is within a range of 10 to 20 degrees from the radial line, the angle increases at least 15 degrees in a radially direction outside the bar, and the angle is in a range of degrees from 10 to 45 on the periphery of the refining surface, where each of the bars includes a main sidewall having an irregular surface, where the irregular surface includes protrusions if extending externally from the main sidewall towards the entrainment sidewall on an adjacent bar and the irregular surface extends radially internally along the bars without reaching an entrance to the refining surface, and in which each protrusion includes a first surface extending from the first substrate towards a top of the bar with the protrusion, a second surface extending from the first surface to the top of the bar and a third surface extending from an edge of the first surface to the substrate, where an inclination of the first surface in relation to the substrate is less than an inclination of the second surface, where each protrusion includes a corner formed at the interface of the first surface, the third surface and the substrate, and the third surface forms an oblique angle in relation to the trailing sidewall so that the third surface and the corner associated with the third surface protrude obliquely from the main sidewall in the slot.
[0028]
28. Segment of the refining plate according to claim 27, characterized by the fact that each of the bars has a longitudinal shape curved in relation to a radial of the plate extending through the bar.
[0029]
29. Segment of refining plate, according to claim 27, characterized by the fact that the angle increases continuously and gradually along the radially external direction.
[0030]
30. Segment of the refining plate, according to claim 27, characterized by the fact that the angle increases in stages along the radially external direction.
[0031]
31. Refining plate segment, according to claim 27, characterized by the fact that the refining plate segment is adapted for a rotating refining disc and to face a rotating refining disc when mounted on a refiner.
[0032]
32. Refining plate segment, according to claim 27, characterized by the fact that the protrusions of the irregular surface form a pattern that is at least one among zigzag, sawtooth, series of impacts, sinusoidal, and a pattern Side Z
[0033]
33. Refining plate segment according to claim 27, characterized by the fact that the protrusions on the irregular surface vary the width of the bar by at least one fifth of the width of the bar along the portion of the bar having the side wall with the uneven surface.
[0034]
34. The refining plate segment according to claim 27, characterized in that the refining surface includes an external refining surface having a higher density of bars than a density of bars in an internal refining section.
[0035]
35. Refining plate segment according to claim 27, characterized in that the protrusions of the irregular surface are more pronounced at an upper edge of the side wall and are less pronounced near a plate substrate.
[0036]
36. The refining plate segment according to claim 27, characterized in that the refining surface includes multiple refining zones, in which a first refining zone has relatively wide bars and relatively wide grooves and a second refining zone it has relatively narrow bars and relatively narrow grooves, and the second refining zone is radially external in the plate segment of the first refining zone.
[0037]
37. Segment of the refining plate, according to claim 36, characterized by the fact that the retention angle refers to the bars of the second refining zone.
[0038]
38. Refining plate segment according to claim 27, characterized in that the uneven surface includes a series of ramps, each having a lower edge in the substrate of each groove extending at least partially to the main side wall .
[0039]
39. Refining plate segment according to claim 27, characterized in that the uneven surfaces of the side walls of the bars include a thick uneven surface on the side walls and a thin uneven surface on the side walls, and the thick uneven surfaces are radially internal or external of the thin uneven surfaces.
[0040]
40. Segment of refining plate according to claim 27, characterized in that the irregular surface is along a radially external portion of the bar and the bars include a smooth surface along a radially internal portion of the bar, the bars are arranged in groups of three or more bars and in each group of bars they extend from a first bar to a last bar in a direction opposite to a rotational direction of the mechanical refiner, and in each group, the irregular surface of each of the bars extends more radially internally than the next bar in the group in a direction opposite to a direction of rotation of the mechanical refiner, except for the last bar in the group that has the irregular surface extending more radially internally than others group bars.

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同族专利:

公开号 | 公开日

EP2732093B1|2019-09-11|

BR112014000734A2|2017-02-14|

JP2014520974A|2014-08-25|

US9708765B2|2017-07-18|

CN103797187A|2014-05-14|

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AU2012281010B2|2016-06-30|

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EP2732093A1|2014-05-21|

CA2841482C|2017-10-24|

CA2841482A1|2013-01-17|

US20170275819A1|2017-09-28|

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法律状态:
2018-04-03| B06F| Objections, documents and/or translations needed after an examination request according art. 34 industrial property law|

2019-07-30| B06U| Preliminary requirement: requests with searches performed by other patent offices: suspension of the patent application procedure|

2020-10-13| B09A| Decision: intention to grant|

2020-12-22| B16A| Patent or certificate of addition of invention granted|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 13/07/2012, OBSERVADAS AS CONDICOES LEGAIS. |

优先权:

申请号 | 申请日 | 专利标题

US201161507450P| true| 2011-07-13|2011-07-13|

US61/507,450|2011-07-13|

US13/547,144|US9708765B2|2011-07-13|2012-07-12|Rotor refiner plate element for counter-rotating refiner having curved bars and serrated leading edges|

US13/547,144|2012-07-12|

PCT/US2012/046651|WO2013010073A1|2011-07-13|2012-07-13|Rotor refiner plate element for counter-rotating refiner having curved bars and serrated leading edges|

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