Apparatus and method for processing wood fibers

Abstract

A refiner member includes a refiner body having a refining surface that includes first and second refiner bars separated by first and second refiner slots. The first and second refiner bars extend from respective first and second radially inward locations to respective first and second radially outward locations. The first and second refiner bars have respective first and second heights extending upward from the bottom of the respective, adjacent first or second refiner slots. The second height is the minimum height of the second refiner bar and is spaced apart from the second radially inward location, the second height being at least about 0.35 mm less than the first height. The first refiner bar is adapted to refine wood fibers, and the second refiner bar is adapted to break up fiber bundles.

Description

[0001] This patent application is a divisional application of patent application No. 201980097921.5 (International Application No. PCT / US2019 / 056504), filed by International Paper Corporation, entitled "Apparatus and Method for Processing Wood Fiber".

[0002] Related applications

[0003] This application is a continuation-in-part of U.S. Patent Application No. 15 / 860,055 (Attorney's File No. TEC-119945-US), filed January 2, 2018, which relates to U.S. Patent Application No. 15 / 860,006 (Attorney's File No. TEC-120257-US), also filed January 2, 2018. Furthermore, this application claims dual priority to U.S. Patent Application No. 15 / 860,006. Technical Field

[0004] This disclosure generally relates to processing wood fibers in a fine grinding mill, and more specifically to apparatus and methods for fine grinding wood fibers and breaking up fiber bundles. Background Technology

[0005] Disc refiners are conventionally used to process wood fibers in a step of the paper product manufacturing process. Such refiners include first and second refiner members having a refiner space therebetween. Each of the first and second refiner members includes a plurality of refiner bars separated by refiner grooves, wherein the refiner bars define a cutting surface for cutting the wood fibers. During operation, at least one of the first and second refiner members rotates relative to the other, wherein the rotation of the cutting surface of the refiner bars cuts the wood fibers processed in the refiner. Once the wood fibers have been processed in the refiner, the processed wood fibers can be further processed in subsequent paper product manufacturing processes to produce paper products. In some cases, the wood fibers may undergo additional processing, such as in a separate brushing or defragmentation machine. As known in the art, conical refiners operate in the same manner, except that the refiner members are located on a conical surface rather than a disc. Summary of the Invention

[0006] According to a first aspect of the invention, a grinding member for a pulp refining mill is provided. The grinding member includes a grinding body, the grinding body including a grinding surface, the grinding surface including a first grinding bar separated from a first grinding mill slot and extending from a first radially inward position to a first radially outward position on the grinding surface, and a second grinding bar separated from a second grinding mill slot and extending from a second radially inward position to a second radially outward position on the grinding surface, wherein the second radially outward position is closer to the outermost portion of the grinding body than the first radially outward position. The first grinding bar has a first height extending upward from the bottom of an adjacent first grinding mill slot, and the second grinding bar has a second height extending upward from the bottom of an adjacent second grinding mill slot. The second height is a minimum height of the second grinding bar and is spaced apart from the second radially inward position, the second height being at least about 0.35 mm smaller than the first height. The first grinding bar is adapted to grind wood fibers, and the second grinding bar is adapted to break up fiber bundles.

[0007] The minimum height of the second fine grinding bar can be adjacent to the second radially outward position.

[0008] The first height can be substantially constant along the longitudinal length of the first grinding mill bar.

[0009] The first height can be from about 4.0 mm to about 10.0 mm. The second height can be about 0.35 mm smaller than the first height to about 7.0 mm, or about 0.7 mm smaller than the first height to about 7.0 mm.

[0010] The second grinding mill bar may be integral with the first grinding mill bar, such that the second grinding mill bar extends from the first radially outward position to the second radially outward position. Each of the second grinding mill bars may be substantially continuously inclined downward along at least a portion of each second grinding mill bar extending between the first radially outward position and the second radially outward position.

[0011] At least a portion of the first fine grinding mill tank may be provided with a baffle.

[0012] The first height of the first grinding mill bar may include a first maximum height, and the second grinding mill bar may include a second maximum height extending upward from the bottom of an adjacent second grinding mill trough, wherein the radially outer portion of each of the first grinding mill bars may include a descending step from the first maximum height to the second maximum height, and wherein the second maximum height may be at least about 1.5 mm smaller than the first maximum height.

[0013] The grinding component may further include a third grinding bar separated from a third grinding mill trough and a fourth grinding bar separated from a fourth grinding mill trough. Each of the third grinding bars may extend to a third radially outward position on the grinding surface, and each of the fourth grinding bars may extend to a fourth radially outward position on the grinding surface, the fourth radially outward position being closer to the outermost portion of the grinding body than the third radially outward position. The third grinding bar may have a third height extending upward from the bottom of an adjacent third grinding mill trough, and the fourth grinding bar may have a fourth height extending upward from the bottom of an adjacent fourth grinding mill trough. The fourth height may be the minimum height of the fourth grinding bar and may be adjacent to the fourth radially outward position. The fourth height may be at least about 0.35 mm smaller than the third height. The third grinding bar may be adapted to grind wood fibers, and the fourth grinding bar may be adapted to break up fiber bundles.

[0014] The third grinding mill rod can be integrated with the second grinding mill rod, such that the third grinding mill rod extends from the second radially outward position to the third radially outward position, and the fourth grinding mill rod can be integrated with the third grinding mill rod, such that the fourth grinding mill rod extends from the third radially outward position to the fourth radially outward position.

[0015] The third height of the third grinding mill bar may include a third maximum height, and the fourth grinding mill bar may include a fourth maximum height extending upward from the bottom of an adjacent fourth grinding mill trough, wherein the radially outer portion of each of the third grinding mill bars may include a descending step from the third maximum height to the fourth maximum height, and wherein the fourth maximum height may be at least about 1.5 mm smaller than the third maximum height.

[0016] According to a second aspect of this disclosure, a pulp refiner is provided. The pulp refiner includes: a frame, at least a first pair of refiner members, and a rotor. The refiner members include a first refiner member associated with the frame and including a first refiner body, and a second refiner member associated with the frame and including a second refiner body. The first refiner body includes a first refiner surface, the first refiner surface including: a first refiner bar separated from a first refiner slot and extending from a first radially inward position on the refiner surface to a first radially outward position on the refiner surface; and a second refiner bar separated from a second refiner slot and extending from a second radially inward position on the refiner surface to a second radially outward position on the refiner surface, the second radially outward position being closer to the outermost portion of the refiner body than the first radially outward position. The first refiner bar has a first height extending upward from the bottom of an adjacent first slot, and the second refiner bar has a second height extending upward from the bottom of an adjacent second slot. The second height is a minimum height of the second refiner bar and is spaced apart from the second radially inward position. The second height is at least about 0.35 mm smaller than the first height. The second grinding member includes a second grinding surface, the second grinding surface including a second grinding bar separated by a second grinding mill groove. The first grinding member and the second grinding member are spaced apart to define a grinding space therebetween, wherein at least a portion of the second grinding bar is positioned opposite to the second grinding bar to define a gap between said portion of the second grinding bar and the second grinding bar. The rotor is coupled to one of the first grinding member or the second grinding member such that rotation of the rotor causes movement of one of the first or second grinding members relative to the other. When a wood pulp comprising wood fibers is supplied to the frame, the wood pulp passes through the grinding space, such that a large number of wood fibers in the wood pulp are ground and multiple bundles of wood fibers in the wood pulp are separated.

[0017] The minimum height of the second fine grinding bar can be adjacent to the second radially outward position.

[0018] The first height can be substantially constant along the longitudinal length of the first grinding mill bar.

[0019] The second height can be at least about 0.7 mm smaller than the first height.

[0020] The first height of the first grinding mill bar may include a first maximum height, and the second grinding mill bar may include a second maximum height extending upward from the bottom of an adjacent second grinding mill trough, wherein the radially outer portion of each of the first grinding mill bars may include a descending step from the first maximum height to the second maximum height, and wherein the second maximum height may be at least about 1.5 mm smaller than the first maximum height.

[0021] The second component grinding bar may include: a first grinding bar element extending from a first radially inward position to a first radially outward position on the second grinding surface, and a second grinding bar element extending to a second radially outward position on the second grinding surface closer to the outermost portion of the second grinding body than the first radially outward position. The first grinding bar element may have a first bar height extending upward from the bottom of an adjacent groove, and the second grinding bar element may have a second bar height extending upward from the bottom of an adjacent groove. The second bar height may be the minimum height of the second grinding bar element and may be adjacent to the second radially outward position. The second bar height may be at least about 0.35 mm smaller than the first bar height.

[0022] According to a third aspect of this disclosure, a method for processing wood fibers is provided. The method includes providing a grinding mill comprising at least a first pair of grinding components. The grinding components include: a first grinding component including a first grinding body and a second grinding component including a second grinding body. The first grinding body includes a first grinding surface, the first grinding surface including: a first grinding bar separated from a first grinding mill slot and having a first height extending upward from the bottom of an adjacent first grinding mill slot; and a second grinding bar separated from a second grinding mill slot and having a second height extending upward from the bottom of an adjacent second grinding mill slot. The second grinding body includes a second grinding surface, the second grinding surface including a second component grinding bar separated from a second component grinding mill slot. The first grinding component and the second grinding component are spaced apart to define a grinding space therebetween, and at least a portion of the second component grinding bar is positioned opposite to the second grinding bar to define a gap between said portion of the second component grinding bar and the second grinding bar. The method further includes: rotating at least one of the first or second grinding member, such that the first and second grinding members move relative to each other; supplying wood pulp comprising wood fibers to the grinding mill, such that the pulp passes through the grinding space; and applying axial pressure to at least one of the first or second grinding member while supplying the pulp. The gap between the portion of the second grinding member and the second grinding member increases along at least a portion of the second grinding member in a direction extending from a first radially inward position toward a first radially outward position on the first grinding surface. At least a portion of the wood fiber bundle passing through the gap is separated.

[0023] The second height may be the minimum height of the second grinding mill bar and may be adjacent to the first radially outward position. The second height may be at least about 0.35 mm smaller than the first height. Attached Figure Description

[0024] Although this specification concludes with the claims that specifically point out and expressly claim protection for the invention, it is believed that the invention will be better understood by taking into account the following description in conjunction with the accompanying drawings, wherein like reference numerals denote like elements, and wherein:

[0025] Figure 1 is a schematic partial cross-sectional view of a disc grinding mill;

[0026] Figure 2 and 3 These are plan views of the first and second fine grinding bodies, respectively;

[0027] Figure 4A and 4B yes Figure 2 A plan view of the cross-section of the fine-grinding surface of the first fine-grinding body;

[0028] Figure 5A and 5B yes Figure 3 A plan view of the cross-section of the fine grinding surface of the second fine grinding body;

[0029] Figure 6A It is along Figure 4A and 5A A partial cross-sectional view of the fine-grinding body taken from line 6A-6A in the figure;

[0030] Figure 6B It is along Figure 4B and 5B A partial cross-sectional view of the fine-grinding body taken from line 6B-6B in the figure;

[0031] Figure 7 It is along Figure 4A , 4B Cross-sectional view of part of line 7-7 in 5A and 5B;

[0032] Figure 8 and 9 It is a partial cross-sectional view of the grinding bar on the first grinding body, wherein the grinding bar is spaced apart from and located above the corresponding grinding bar on the second grinding body;

[0033] Figure 10 and 11 These are plan views of the first and second grinding bodies, which include multiple radially extending disc-shaped segments.

[0034] Figure 12A and 12B It comes from Figure 10 and 11 A partial cross-sectional view of a disc-shaped section of a fine grinding mill bar, wherein one fine grinding body is spaced apart from and above another fine grinding body;

[0035] Figure 13 and 14 These are plan views of the first and second precision grinding bodies, including the teeth;

[0036] Figure 15 yes Figure 13 A plan view of the cross-section of the fine-grinding surface of the first fine-grinding body;

[0037] Figure 16 yes Figure 14 A plan view of the cross-section of the fine grinding surface of the second fine grinding body;

[0038] Figure 17 It is a partial cross-sectional view of the grinding machine rod and teeth on the first grinding body, which is spaced apart from and located above the second grinding body, which includes the grinding machine rod and teeth;

[0039] Figure 18 This is a flowchart illustrating an exemplary method for processing wood fibers;

[0040] Figure 19A It is similar to Figure 6A A partial cross-sectional view of the precision-ground body;

[0041] Figure 19B It is similar to Figure 6B A partial cross-sectional view of the precision-ground body; and

[0042] Figure 20 This is a flowchart illustrating another exemplary method for processing wood fibers. Detailed Implementation

[0043] In the following detailed description of preferred embodiments, reference is made to the accompanying drawings, which form a part of the invention, wherein specific preferred embodiments in which the invention can be practiced are shown by way of illustration rather than limitation. It should be understood that other embodiments may be utilized and changes may be made without departing from the spirit and scope of the invention.

[0044] Figure 1 A schematic partial cross-sectional view of a disc grinding mill 10 according to the present disclosure is shown. The disc grinding mill 10 includes a housing having a first housing section 12 and a second housing section 14 that can be bolted or otherwise fixedly attached together. The housing sections 12 and 14 define an inlet 16, an outlet 18, and a grinding mill cavity 64 containing one or more pairs of grinding elements. Figure 1 The embodiment shown is a dual-disc grinding mill 10, comprising two pairs of grinding components, for example, a first grinding component 20 paired with a second grinding component 30, and a third grinding component 40 paired with a fourth grinding component 50. The first grinding component 20 includes a first grinding body 22 having a first grinding surface 24, and the second grinding component 30 includes a second grinding body 32 having a second grinding surface 34. The third grinding component 40 includes a third grinding body 42 and a third grinding surface 44, and the fourth grinding component 50 includes a fourth grinding body 52 and a fourth grinding surface 54. Each of the grinding components 20, 30, 40, and 50 is associated with a main support frame, which includes a fixed support frame 66 fixed to a first housing section 12 and a movable support frame 68, as described herein.

[0045] The first, second, third, and fourth precision grinding bodies 22, 32, 42, and 52 can be generally disc-shaped with essentially the same outer diameter (see...). Figure 2 and 3The first and second grinding members 20 and 30 are arranged such that the first grinding surface 24 faces the second grinding surface 34, and the third and fourth grinding members 40 and 50 are arranged such that the third grinding surface 44 faces the fourth grinding surface 54. The first grinding member 20 and the second grinding member 30 are spaced apart to define a first grinding space 60 between the respective grinding surfaces 24 and 34. The third grinding member 40 and the fourth grinding member 50 are spaced apart to define a second grinding space 62 between the respective grinding surfaces 44 and 54. The disc grinding mill 10 may have a structure similar to that shown in U.S. Patent Application Publication No. 2006 / 0037728A1, the disclosure of which is incorporated herein by reference.

[0046] exist Figure 1 In the illustrated embodiment, the first and fourth grinding components 20, 50 are stationary, and the second and third grinding components 30, 40 rotate relative to the first and fourth grinding components 20, 50. The first grinding component 20 can be secured to the support frame 66 by bolts or other suitable fasteners (not shown). The second and third grinding components 30, 40 can be attached to a support 70, which is coupled to a rotatable shaft 72 and extends radially outward from the rotatable shaft. The support 70 is coupled to the shaft 72 to rotate with the shaft 72 and can also move axially along the shaft 72. The shaft 72 is driven by a first motor 74 such that the support 70 and the second and third grinding components 30, 40 rotate with the shaft 72 during operation of the disc grinder 10. The shaft 72 has a central axis 72A, which is substantially coaxial with the axis of rotation of the second and third grinding components 30, 40. The shaft 72 can be rotatably mounted to the fixed support frame 66 such that the first and second grinding components 30, 40 are associated with the main support frame. As described herein, support member 70 is movable relative to the first and fourth grinding members 20, 50 along shaft 72, for example, substantially axially along central axis 72A. Fourth grinding member 50 can be secured to movable support frame 68 by bolts or other suitable fasteners (not shown). Thus, support member 70 and shaft 72 define a rotor associated with the main support frame, such that second and third grinding members define rotating rotor members, and first and fourth grinding members 20, 50 define non-rotating stator members. Rotation of the rotor enables movement of second and third grinding members 30, 40 relative to first and fourth grinding members 20, 50, respectively.

[0047] A movable support frame 68 can be mounted in the second housing section 14 and coupled to a second motor 76, which may include a fixedly positioned reversible electric motor. The second motor 76 moves the movable support frame 68 in a generally horizontal (i.e., axial) direction as indicated by arrow A. The grinding mill 10 may include, for example, a lifting screw (not shown) coupled to the second motor 76 and the movable support frame 68, which the second motor 76 can rotate to move, for example, the movable support frame 68 to which a fourth grinding member 50 is attached. This movement adjusts the size of the clearance, i.e., the first and second grinding spaces 60, 62 defined between the first and second grinding members 20, 30 and the third and fourth grinding members 40, 50 (see also...). Figure 8 and 9 In other embodiments (not shown), the clearance size can be controlled by one or more magnetic bearings. Magnetic bearings controlling the axial position of shaft 72 can be used to control the position of a rotating rotor component fixed to shaft 72. Magnetic bearings can be used to control the axial position of one or more additional movable sections (i.e., movable support frame 68) of one or more attached main support frames in the non-rotating stator component.

[0048] As will be further discussed herein, the pulp, comprising wood fibers, passes through the finishing spaces 60, 62. When the lifting screw rotates in the first direction, it causes the movable support frame 68 and the fourth finishing member 50 to move inward toward the third finishing member 40. The fourth finishing member 50 then applies an axial force to the pulp passing through the second finishing space 62, which in turn applies an axial force to the third finishing member 40, causing the third finishing member 40, the support member 70, and the second finishing member 30 to move inward toward the first finishing member 20. When the lifting screw rotates in the second direction opposite to the first direction, it causes the movable support frame 68 and the fourth finishing member 50 to move outward away from the third finishing member 40. This reduces the axial force applied by the fourth finishing member 50 to the pulp passing through the second finishing space 62, which in turn reduces the axial force applied by the pulp to the third finishing member 40. The axial force exerted by the pulp passing through the first polishing space 60 is then sufficient to move the second polishing member 30, the support 70, and the third polishing member 40 toward the fourth polishing member 50. This continues until the axial forces exerted on the second and third polishing members 30 and 40 by the wood pulp passing through the first and second polishing spaces 60, 62 are approximately equal.

[0049] In some embodiments (not shown), the disc grinding mill 10 may further include an additional motor and a second rotatable shaft, and the first and / or fourth grinding members 20, 50 may be coupled to the second rotatable shaft such that the first and / or fourth rotatable shaft or the fourth grinding members 20, 50 may rotate in opposite directions relative to the second and / or third grinding members 30, 40, respectively. In other embodiments (not shown), the disc grinding mill 10 may include only one pair of grinding members, one of which is a non-rotating stator member and the other is a rotating rotor member. In other embodiments (not shown), the disc grinding mill may include three or more pairs of grinding members. In still other embodiments (not shown), the disc grinding mill 10 may include a conical grinding mill having one or more pairs of grinding members.

[0050] Figure 2 and 3 These are plan views of the polishing surfaces 24, 34 of a first polishing body 22 and a second polishing body 32 in a pulp polisher according to an embodiment of the present disclosure. Although not discussed in detail herein, the structures of the corresponding polishing surfaces 44, 54 of the third and fourth polishing bodies 42, 52 (see [link to documentation]). Figure 1 The corresponding polished surfaces 24 and 34 of the first and second polished bodies 22 and 32 can be substantially similar to those of the first and second polished bodies 22 and 32.

[0051] refer to Figure 1 and 2 The first grinding body 22 may include multiple segments, such as segments 22A-22C, which are bolted together or otherwise attached to form a disc-shaped grinding body 22 including a radially outer edge 27. The grinding surface 24 includes a plurality of elongated grinding bars 26 separated from each other by grinding grooves 28. Although not described in... Figure 2 As shown, but it should be understood, other sections (not labeled) of the first grinding body 22 will similarly include the grinding bar 26 and the grinding groove 28. The grinding bar 26 extends radially outward from a radially inner position 23 toward the radially outer edge 27 of the first grinding body 22. The grinding bar 26 may be inclined at various angles, such as... Figure 2 As shown, each segment 22A-22C may include one or more segments (not individually labeled) of the milling bar 26 inclined in different directions. Figure 2 The grinding mill bars 26 and grinding mill troughs 28 within each section 22A-22C may be structurally similar in other respects.

[0052] like Figure 3As shown, the second grinding body 32 may similarly comprise multiple segments, such as segments 32A-32C, which are bolted together or otherwise attached to form a disc-shaped grinding body 32 including a radially outer edge 37. The grinding surface 34 comprises a plurality of elongated grinding bars 36 separated from each other by grinding grooves 38. Although not shown in Figure 3 As shown, but it should be understood, other sections (not marked) of the second grinding body 32 will similarly include the grinding bar 36 and the grinding groove 38. The grinding bar 36 extends radially outward from its radially inner position 33 toward the radially outer edge 37 of the second grinding body 32. The grinding bar 36 may be inclined at various angles, such as... Figure 3 As shown, each segment 32A-32C may include two or more segments (not individually labeled) of a fine grinding bar 36 inclined in different directions. Figure 3 The grinding mill bars 36 and grinding mill troughs 38 within each section 32A-32C may be structurally similar in other respects.

[0053] The pulp, including wood fiber, is passed through the path of the refiner 10 via... Figure 1 Arrow B is shown in the image. (See reference) Figure 1-3 The pulp enters the disc refiner 10 through inlet 16 and enters the refiner cavity 64 via the central hole 21 in the first refiner member 20. The refiner cavity 64 may be partially defined by a fixed support frame 66 and a movable support frame 68. The refiner surfaces 24, 34 may include one or more rows of additional refiner bars (not labeled), for example, located near the center of the refiner bodies 22, 32, such as those near the central hole 21. These additional refiner bars may be wider and more widely spaced than the other refiner bars 26 to break up large fiber bundles before they enter the refiner space 60. The wood fibers travel radially outward between the refiner members 20, 30, 40, 50. The first refiner space 60 defined between the first and second refiner members 20, 30 and the second refiner space 62 defined between the third and fourth refiner members 40, 50 define independent paths along which the wood fibers can travel from inlet 16 to outlet 18. It is believed that the wood fibers pass through only one of the first and second grinding chambers 60, 62 at a time. Grinding mill troughs 28, 38 can be considered as part of the grinding space 60 defined between the first and second grinding members 20, 30. It is believed that the majority of the wood fiber flow through the grinding space 60 passes through the grinding mill troughs 28, 38. Similarly, the grinding mill troughs (not shown) of the third and fourth grinding members 40, 50 can be considered as part of the grinding space 62 defined between the third and fourth grinding members 40, 50. It is believed that the majority of the wood fiber flow through the grinding space 62 passes through the grinding mill troughs (not labeled) of the third and fourth grinding members 40, 50. After processing, the wood fibers exit the grinding mill 10 via outlet 18 under centrifugal force, at least partially.

[0054] Figure 4A and 4B This is a detailed view of a portion of the polished surface 24 of the first polishing body 22, and Figure 5A and 5B This is a detailed view of the corresponding portion of the polished surface 34 of the second polishing body 32. Figure 6A and 6B These are partial cross-sectional views of the grinding bodies 22 and 32, taken along lines 6A-6A and 6B-6B respectively, showing two embodiments of the grinding mill bars 26 and 36, as follows. Figure 4A , 4B As shown in 5A and 5B. Figure 7 It is along Figure 4A , 4B Cross-sectional view of part of line 7-7 in 5A and 5B.

[0055] exist Figure 4A , 5A In the embodiments shown in 6A and 7, each grinding mill bar 26, 36 may include a first grinding mill bar 26A, 36A and a second grinding mill bar 26B, 36B. The first grinding mill bars 26A, 36A can be separated from each other through first grinding mill grooves 28A, 38A, and the second grinding mill bars 26B, 36B can be separated from each other through second grinding mill grooves 28B, 38B. The first and second grinding mill grooves 28A, 38A, 28B, 38B may have a width W of about 2.0 mm to about 6.0 mm. G This range includes all values ​​within it and sub-ranges, including, for example, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5, 5.0, 5.5, and 6.0 mm. For example... Figure 6A and 7 As shown, the first grinding mill bars 26A and 36A include a first maximum height H1 extending upward from the bottom F1 of adjacent first grinding mill troughs 28A and 38A, and the second grinding mill bars 26B and 36B include a second maximum height H2 extending upward from the bottom F2 of adjacent second grinding mill troughs 28B and 38B, wherein the second maximum height H2 is less than the first maximum height H1. The minimum height difference between H1 and H2 is... Figure 6A This is shown as D1. In some examples, the radially outer portion RO1 of the first grinding bar 26A, 36A may include a descending step from a first maximum height H1 to a second maximum height H2.

[0056] In some examples, the second maximum height H2 may be at least about 0.35 mm (±0.05 mm) smaller than the first maximum height H1. In other examples, the second maximum height H2 may be at least 0.7 mm (±0.05 mm) smaller than the first maximum height H1. In yet another example, when measured from the bottom F1 of adjacent first grinding mill tanks 28A, 38A, the first maximum height H1 of the first grinding mill bars 26A, 36A may be about 4.0 mm to about 10.0 mm (±0.5 mm). This range includes all values ​​and sub-ranges therein, including, for example, 4.0, 4.5, 5.0, 5.5, 6.0, 6.5, 7.0, 7.5, 8.0, 8.5, 9.0, 9.5, and 10.0 mm. In a specific example, when measured from the bottom F2 of adjacent second grinding mill troughs 28B, 38B, the second maximum height H2 of the second grinding mill bars 26B, 36B can be approximately 0.35 mm to approximately 1.5 mm (±0.05 mm) smaller than the first maximum height H1. This range includes all values ​​and sub-ranges therein, including, for example, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95, 1.0, 1.05, 1.1, 1.15, 1.2, 1.25, 1.3, 1.35, 1.4, 1.45, and 1.5 mm. In another specific example, when measured from the bottom F2 of adjacent second grinding mill grooves 28B, 38B, the second maximum height H2 of the second grinding mill bars 26B, 36B can be approximately 0.7 mm to approximately 1.5 mm (±0.05 mm) smaller than the first maximum height H1. This range includes all values ​​and sub-ranges therein, including, for example, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95, 1.0, 1.05, 1.1, 1.15, 1.2, 1.25, 1.3, 1.35, 1.4, 1.45, and 1.5 mm. In further examples where the radially outer portion RO1 of the first grinding mill bars 26A, 36A includes a descending step from the first maximum height H1 to the second maximum height H2, the second maximum height H2 can be approximately 1.5 mm (±0.05 mm) smaller than the first maximum height H1. In some cases, the second maximum height H2 may be at least about 2.0 mm (±0.05 mm) smaller than the first maximum height H1, while in other cases, the second maximum height H2 may be at least about 3.0 mm (±0.05 mm) smaller than the first maximum height H1.

[0057] Each of the first grinding bars 26A and 36A extends from a radially inward position P1 on the grinding surfaces 24 and 34 to a first radially outward position P2 on the grinding surfaces 24 and 34. Each of the second grinding bars 26B and 36B extends to a second radially outward position P3 on the grinding surfaces 24 and 34. The second radially outward position P3 may be closer to the outermost portion of the grinding bodies 22 and 32 than the first radially outward position P2, for example, the radially outer edges 27 and 37. In some examples, the radially inward position P1 may be located at or near the radially inner position 23 and 33. The second grinding bars 26B and 36B may include a longitudinal length L1 of about 0.6 cm to about 10 cm, and preferably about 2 cm to about 10 cm. The first grinding mill bars 26A and 36A and the second grinding mill bars 26B and 36B may include a width W of approximately 2.0 mm to approximately 8.0 mm extending between the side edges of the respective grinding mill bars 26A, 36A, 26B, and 36B. 26 This range includes all values ​​and subranges within it, including, for example, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5, 5.0, 5.5, 6.0, 6.5, 7.0, 7.5, and 8.0 mm.

[0058] In some embodiments, the second grinding mill rods 26B and 36B can be integrally formed with the first grinding mill rods 26A and 36A, such as... Figure 4A , 5A As shown in Figure 6A, the second grinding mill bars 26B and 36B extend from a first radially outward position P2 to a second radially outward position P3. In a particular embodiment, the second grinding mill bars 26B and 36B can be continuously inclined downward from the first radially outward position P2 to the second radially outward position P3. Figure 6A As shown, the heights of the second grinding mill bars 26B and 36B can range from the second maximum height H2 to the second minimum height H along substantially the entire longitudinal length L1. 2' Continuously decreasing. In another specific embodiment, the second grinding mill bars 26B, 36B can extend substantially horizontally from the first radially outward position P2 to the second radially outward position P3, such as... Figure 6A As shown by the dashed lines, the second grinding mill bars 26B and 36B are positioned at a second maximum height H2 along substantially the entire longitudinal length L1 of the second grinding mill bars 26B and 36B. In other embodiments (not shown), the first grinding mill bars 26A and 36A can be radially separated from the second grinding mill bars 26B and 36B by space.

[0059] refer to Figure 4A , 5A7. The polished surfaces 24, 34 may include baffles 29, 39 disposed in at least a portion of the first polishing mill grooves 28A, 38A. The baffles 29, 39 may include a height substantially equal to or less than the height of the adjacent first polishing mill bars 26A, 36A. The baffles 29, 39 are used to deflect wood fibers from the first polishing mill grooves 28A, 38A so that they may be joined by the first and second polishing mill bars 26A, 36A, 26B, 36B.

[0060] refer to Figure 1 , 4A 5A and 6A, when pulp containing wood fibers is supplied to frame 66, such as the inlet 16 of refiner 10, first refiner bars 26A, 36A are adapted to refine the wood fibers in the pulp, while second refiner bars 26B, 36B are adapted to break down or separate fiber bundles. Refining can be used to break down and reduce small flocs in the fibers, causing external or internal fibrillation to achieve fiber bonding, and / or to cut a large number of long wood fibers in the pulp, reducing their length. However, the refining process can also cause some wood fibers to reform into small, dense fiber bundles (“flakes”), especially during the refining of long fibers (such as cork). Fiber bundles can adversely affect the tensile strength, shape, etc., of the finished paper product, clog the seed formation of pulp strings in downstream components, and / or inhibit fluid / water drainage from the fibers during paper product production. Therefore, flakes should be broken down after refining in a process called deflaking. As used herein, the term "fragmentation" refers to the process of breaking down fiber bundles formed during finishing. When finishing involves conventional pulp finishing mills, fragmentation typically occurs in one or more subsequent finishing mills, which are usually operated at low power and referred to as "roughening mills" or fragmentation mills. Using separate finishing mills or fragmentation mills increases the cost and complexity of the system. Additionally, the roughening mill and associated piping and tanks, as well as downstream cabinets, can accumulate residual fibers from previous runs and allow for continued fiber bundle formation. When different pulp slurries are finished together, the processing performed in the roughening mill can degrade fiber properties. It is believed that the finishing components 20, 30, 40, 50 according to this disclosure address these problems by incorporating finishing mill bars 26A, 26B, 36A, 36B of varying heights, allowing finishing and fragmentation to occur within a single finishing mill 10.

[0061] The first maximum height H1 of the first grinding mill bars 26A and 36A is greater than the second maximum height H2, meaning that the wood fibers are subjected to high shear and compressive forces when passing through the portion of the grinding space 60 defined at least partially by the first grinding mill grooves 28A and 38A and joined by the cut side edges 126A and 136A of the first grinding mill bars 26A and 36A on the opposing first and second grinding surfaces 24 and 34 (see also...). Figure 8 and 9Therefore, a portion of the grinding space 60, at least partially defined by the first grinding mill tanks 28A, 38A and extending from a radially inward position P1 on the grinding surfaces 24, 34 to a first radially outward position P2 on the grinding surfaces 24, 34, can at least partially define the grinding zone. In some examples, the radially inward positions 23, 33 of the corresponding grinding bodies 22, 32 can define the starting point of the grinding zone. When the grinding fibers enter a portion of the grinding space 60 at least partially defined by the second grinding mill tanks 28B, 38B (e.g., from...), the grinding zone is defined by the first grinding mill tanks 28A, 38A and extending from a radially inward position P1 on the grinding surfaces 24, 34 to a first radially outward position P2 on the grinding surfaces 24, 34. Figure 6A At approximately the first radially outward position P2 to the second radially outward position P3, the second polishing bars 26B and 36B include a second maximum H2, and the strength of the force applied to the fiber decreases in response to the decreasing height (see also...). Figure 8 and 9 Therefore, a portion of the fine grinding space 60, at least partially defined by the second fine grinding chambers 28B, 38B and extending from a first radially outward position P2 on the fine grinding surfaces 24, 34 to a second radially outward position P3, can at least partially define a disintegration zone. It is believed that the reduced force applied to the fibers in the disintegration zone breaks up the fiber bundles formed during fine grinding without further fine grinding or with only minimal fine grinding of the fibers. Figure 6A In the illustrated embodiment, the second polishing bars 26B, 36B form an annular ring defining a loosening zone surrounding the radially outer portion (not separately labeled) of the first and second polishing bodies 22, 32. It is believed that the second maximum height H2 of the second polishing bars 26B, 36B should be at least about 0.35 mm (±0.05 mm) smaller than the first maximum height H1 of the first polishing bars 26A, 36A in order to stop the polishing of the fibers and begin loosening. The polishing zone may comprise 60% or more of the total area defined by both the polishing zone and the loosening zone on each polishing surface 24, 34.

[0062] exist Figure 4B , 5B In the embodiments shown in 6B, each grinding mill bar 26', 36' may include a first grinding mill bar 26A', 36A', a second grinding mill bar 26B', 36B', a third grinding mill bar 26C, 36C, and a fourth grinding mill bar 26D, 36D. The first grinding mill bar 26A', 36A' and the second grinding mill bar 26B', 36' may be substantially similar to... Figure 4A , 5AThe first grinding mill bars 26A, 36A and 26B, 36B shown in Figures 6A and 7 and the second grinding mill bars 26A', 36A', 26B', 36B' as described herein may extend radially outward by a shorter distance. The first grinding mill bars 26A', 36A' may be separated from each other by the first grinding mill grooves 28A', 38A', and the second grinding mill bars 26B', 36B' may be separated from each other by the second grinding mill grooves 28B', 38B'. The first and second grinding mill grooves 28A', 38A', 28B', 38B' may have a width W of about 2.0 mm to about 6.0 mm. G This range includes all values ​​and sub-ranges within it, including, for example, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5, 5.0, 5.5, and 6.0 mm. The third grinding mill bars 26C and 36C can be separated from each other by the third grinding mill grooves 28C and 38C, and the fourth grinding mill bars 26D and 36D can be separated from each other by the fourth grinding mill grooves 28D and 38D. For example... Figure 6B As shown, the third grinding mill bars 26C and 36C include a third maximum height H3 extending upward from the bottom F3 of the adjacent third grinding mill troughs 28C and 38C, and the fourth grinding mill bars 26D and 36D include a fourth maximum height H4 extending upward from the bottom F4 of the adjacent fourth grinding mill troughs 28D and 38D, wherein the fourth maximum height H4 is less than the third maximum height H3. The third maximum height H3 may be substantially equal to the first maximum height H1 and the fourth maximum height H4 may be substantially equal to the second maximum height H2. The minimum height difference between H3 and H4 is... Figure 6B This is shown as D2. In some examples, the radially outer portion RO2 of the third grinding mill bars 26C, 36C may include a descending step from the third maximum height H3 to the fourth maximum height H4. The third and fourth grinding mill grooves 28C, 38C, 28D, 38D may have a width W of about 2.0 mm to about 6.0 mm. G This range includes all values ​​and subranges within it, including, for example, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5, 5.0, 5.5, and 6.0 mm.

[0063] In some examples, the fourth maximum height H4 may be at least 0.35 mm (±0.05 mm) smaller than the third maximum height H3. In other examples, the fourth maximum height H4 may be at least 0.7 mm (±0.05 mm) smaller than the third maximum height H3. In yet another example, when measured from the bottom F3 of adjacent third grinding mill tanks 28C, 38C, the third maximum height H3 of the third grinding mill bars 26C, 36C may be from about 4.0 mm to about 10.0 mm (±0.5 mm). This range includes all values ​​and sub-ranges therein, including, for example, 4.0, 4.5, 5.0, 5.5, 6.0, 6.5, 7.0, 7.5, 8.0, 8.5, 9.0, 9.5, and 10.0 mm. In a specific example, when measured from the bottom F4 of adjacent fourth grinding mill tanks 28D and 38D, the fourth maximum height H4 of the fourth grinding mill bars 26D and 36D can be approximately 0.35 mm to approximately 1.5 mm (±0.05 mm) smaller than the third maximum height H3. This range includes all values ​​and sub-ranges therein, including, for example, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95, 1.0, 1.05, 1.1, 1.15, 1.2, 1.25, 1.3, 1.35, 1.4, 1.45, and 1.5 mm. In another specific example, when measured from the bottom F4 of adjacent fourth grinding mill bars 28D, 38D, the fourth maximum height H4 of the fourth grinding mill bars 26D, 36D can be approximately 0.7 mm to approximately 1.5 mm (±0.05 mm) smaller than the third maximum height H3. This range includes all values ​​and sub-ranges therein, including, for example, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95, 1.0, 1.05, 1.1, 1.15, 1.2, 1.25, 1.3, 1.35, 1.4, 1.45, and 1.5 mm. In further examples where the radially outer portion RO2 of the third grinding mill bars 26C, 36C includes a descending step from the third maximum height H3 to the fourth maximum height H4, the fourth maximum height H4 can be at least approximately 1.5 mm (±0.05 mm) smaller than the third maximum height H3. In some cases, the fourth maximum height H4 may be at least about 2.0 mm (±0.05 mm) smaller than the third maximum height H3, while in other cases, the fourth maximum height H4 may be at least about 3.0 mm (±0.05 mm) smaller than the third maximum height H3.

[0064] Each of the first grinding bars 26A' and 36A' is located radially inward from the grinding surfaces 24 and 34 at position P. 1' The first radially outward position P extends onto the finely ground surfaces 24 and 34 2'Each of the second grinding mill bars 26B' ​​and 36B' extends to a second radially outward position P on the grinding surfaces 24 and 34. 3' Each of the third grinding mill bars 26C and 36C extends to a third radially outward position P4 on the grinding surfaces 24 and 34. Each of the fourth grinding mill bars 26D and 36D extends to a fourth radially outward position P5 on the grinding surfaces 24 and 34. The fourth radially outward position P5 can be greater than the first, second, and third radially outward positions P... 2' P 3' The fourth grinding bars 26D and 36D may include a longitudinal length L2 of about 0.6 cm to about 10 cm, and preferably about 2 cm to about 10 cm, closer to the outermost portion of the grinding bodies 22 and 32, such as the radial outer edges 27 and 37. The third grinding bars 26C and 36C and the fourth grinding bars 26D and 36D may include a width of about 2.0 mm to about 8.0 mm (not separately marked) extending between the side edges of the respective grinding bars 26C, 36C, 26D, and 36D. This range includes all values ​​and sub-ranges therein, including, for example, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5, 5.0, 5.5, 6.0, 6.5, 7.0, 7.5, and 8.0 mm.

[0065] In some embodiments, the second grinding mill bars 26B' ​​and 36B' can be integrally formed with the first grinding mill bars 26A' and 36A', such as... Figure 4B , 5B As shown in 6B, the second grinding mill bars 26B' ​​and 36B' are positioned radially outward from the first radial position P. 2' Extending to the second radially outward position P 3' In some embodiments, such as Figure 4B , 5B As shown in Figure 6B, the third grinding mill bars 26C and 36C can be integrated with the second grinding mill bars 26B' ​​and 36B', such that the third grinding mill bars 26C and 36C are positioned outward from the second radial direction P. 3' Extending to the third radially outward position P 4' Furthermore, the fourth grinding mill rods 26D and 36D can be integrated with the third grinding mill rods 26C and 36C, such that the fourth grinding mill rods 26D and 36D extend from the third radially outward position P4 to the fourth radially outward position P5. In a specific embodiment, the second grinding mill rods 26B' ​​and 36B' can extend from the first radially outward position P5. 2' To the second radial outward position P 3' It slopes continuously downwards. For example... Figure 6BAs shown, the second grinding mill bars 26B' ​​and 36B' may include a longitudinal length L1 of about 0.6 cm to about 10 cm, and preferably about 2 cm to about 10 cm. The height of the second grinding mill bars 26B' ​​and 36B' may range from a second maximum height H2 to a second minimum height H along substantially the entire longitudinal length L1. 2' Continuously decreasing. In another specific embodiment, the second grinding mill bars 26B', 36B' can be moved from the first radially outward position P. 2' It extends substantially horizontally to the second radially outward position P 3' ,like Figure 6B As shown by the dashed lines, the second grinding mill bars 26B' ​​and 36B' are positioned at a second maximum height H2 along substantially the entire longitudinal length L1 of the second grinding mill bars 26B' ​​and 36B'. In a particular embodiment, the fourth grinding mill bars 26D and 36D can be continuously inclined downwards from a third radially outward position P4 to a fourth radially outward position P5. Figure 6B As shown, the heights of the fourth grinding mill bars 26D and 36D can vary along substantially the entire longitudinal length L2 from the fourth maximum height H4 to the fourth minimum height H. 4' Continuously decreasing. In another specific embodiment, the fourth grinding mill bars 26D, 36D can extend substantially horizontally from the third radially outward position P4 to the fourth radially outward position P5, as... Figure 6B As shown by the dashed lines, the fourth grinding mill bars 26D and 36D are positioned at a fourth maximum height H4 along substantially the entire longitudinal length L2 of the fourth grinding mill bars 26D and 36D. In other embodiments (not shown), the third grinding mill bars 26C and 36C can be radially separated from the fourth grinding mill bars 26D and 36D by space.

[0066] refer to Figure 4B , 5B 7. The polished surfaces 24, 34 may include baffles 29, 39 disposed in at least a portion of the first and / or third polishing mill tanks 28A', 38A', 28C, 38C, as described herein.

[0067] Figure 4B , 5B The first grinding rods 26A' and 36A' in 6B are suitable for grinding wood fibers, and Figure 4B , 5B The second grinding rods 26B' ​​and 36B' in 6B are suitable for shredding wood fibers, as per [reference needed]. Figure 4A , 5AThe first and second grinding bars 26A, 36A, 26B, and 36B in 6A are described. The third grinding bars 26C and 36C are adapted to grind wood fibers (similar to the first grinding bars 26A' and 36A'), while the fourth grinding bars 26D and 36D are adapted to break up fiber bundles (similar to the second grinding bars 26B' ​​and 36B'), as described herein.

[0068] refer to Figure 1 , 4B 5B and 6B are at least partially defined by the first fine grinding mill tanks 28A' and 38A' and the third fine grinding mill tanks 28C and 38C, and are located radially inward at position P on the fine grinding surfaces 24 and 34. 1' Extending to the first radially outward position P 2' And from the second radial outward position P 3' The portion of the grinding space 60 extending to the third radially outward position P4 can at least partially define the first and second grinding zones, respectively. It is at least partially defined by the second grinding chambers 28B', 38B' and the fourth grinding chambers 28D, 38D, and extends from the first radially outward position P4 on the grinding surfaces 24, 34. 2' Extending to the second radially outward position P 3' Furthermore, the portion of the fine grinding space 60 extending from the third radially outward position P4 to the fourth radially outward position P5 can at least partially define the first and second delamination zones, respectively. It is believed that the second maximum height H2 of the second fine grinding bars 26B' ​​and 36B' should be at least about 0.35 mm (±0.05 mm) smaller than the first maximum height H1 of the first fine grinding bars 26A' and 36A' in order to stop fine grinding of the fibers and begin delamination. Similarly, it is believed that the fourth maximum height H4 of the fourth fine grinding bars 26D and 36D should be at least about 0.35 mm (±0.05 mm) smaller than the third maximum height H3 of the third fine grinding bars 26C and 36C in order to stop fine grinding of the fibers and begin delamination. The first and second fine grinding zones may comprise 60% or more of the total area defined by both the first and second fine grinding zones and the delamination zone on each fine grinding surface 24, 34.

[0069] Figure 8 and 9 This is a partial cross-sectional view of the first and second grinding bodies 22, 32 / 132 of the first and second grinding components 20, 30 / 130 according to this disclosure. The first grinding component 20 is spaced apart from and adjacent to the second grinding component 30 and is positioned relative to it (see [reference]). Figure 1 ).exist Figure 8In the illustrated embodiment, the fine grinding body according to the present invention, such as the first fine grinding body 22, is paired with a conventional fine grinding body 132. The first fine grinding body 22 includes a first fine grinding bar 26A, a first fine grinding groove 28A, a second fine grinding bar 26B, and a second fine grinding groove 28B, which may correspond to the first and second fine grinding bars 26A, 26B and the first and second fine grinding grooves 28A, 28B, as described herein. Figure 4A , 4B As described in 6A, 6B and 7. It should be understood that, Figure 8 The features described in the text regarding the first and second grinding mill bars 26A, 26B and the first and second grinding mill troughs 28A, 28B are also applicable to the third and fourth grinding mill bars 26C, 26D and the third and fourth grinding mill troughs 28C, 28D, as described herein (see [link to document]). Figure 4B , 5B (and 6B). The conventional grinding body 132 includes a conventional grinding mill bar 136 and a grinding mill groove 138, the conventional grinding mill bar having a uniform height along substantially the entire longitudinal length of the grinding mill bar 136. In other embodiments (not shown), non-rotating stator components, such as the first grinding component 20, may include conventional grinding mill bars having a uniform height along substantially the entire length thereof, and rotating rotor components, such as the second grinding component 30, may include grinding mill bars 26A, 26B and grinding mill grooves 28A, 28B according to this disclosure (see 6B). Figure 1 ).

[0070] exist Figure 8 On the outer surface S of the first fine grinding mill bar 26A 26A The outer surface S of the conventional precision grinding mill bar 136 136 A first gap G1 is defined between them. In the example where the second grinding mill bar 26B is continuously inclined downwards, the second gap G2 can be defined on the outer surface S of the second grinding mill bar 26B. 26B Between the outer surface of the conventional fine grinding mill bar 136 and the outer surface of the second fine grinding mill bar 26B, where G2 is greater than G1. The second fine grinding mill bar 26B extends substantially horizontally (in...). Figure 8 In the example shown by the dashed line, the outer surface S of the second grinding mill bar 26B can be... 26B' The outer surface S of the conventional precision grinding mill bar 136 136 A third gap G3 is defined between them, where G3 is greater than G1. For example... Figure 8 As shown, in an embodiment where one of the second grinding mill bars (e.g., the second grinding mill bar 26B) is tilted, the outer surface S of the second grinding mill bar 26B... 26B The outer surface S of the conventional precision grinding mill bar 136 136 The distance between them can be along the longitudinal length of the second grinding mill bar 26B (unmarked; see [link]). Figure 6A and 6BAt least a portion of the distance increases continuously from the minimum distance corresponding to the third gap G3 to the maximum distance corresponding to the second gap G2.

[0071] exist Figure 9 In the illustrated embodiment, one grinding body according to the invention (e.g., the first grinding body 22) is paired with another grinding body according to the invention (e.g., the second grinding body 32). The first grinding body 22 includes a first grinding bar 26A, a first grinding groove 28A, a second grinding bar 26B, and a second grinding groove 28B, which may correspond to the first and second grinding bars 26A, 26B and the first and second grinding grooves 28A, 28B, as described herein. Figure 4A , 4B As described in 6A, 6B, and 7. The second fine grinding body 32 includes a first fine grinding mill bar 36A, a first fine grinding mill groove 38A, a second fine grinding mill bar 36B, and a second fine grinding mill groove 38B, which may correspond to the first and second fine grinding mill bars 36A and 36B and the first and second fine grinding mill grooves 38A and 38B, as described herein. Figure 5A , 5B As described in 6A, 6B and 7. It should be understood that, Figure 9 The features described in the text regarding the first and second grinding mill bars 26A, 26B, 36A, 36B and the first and second grinding mill troughs 28A, 28B, 38A, 38B also apply to the third and fourth grinding mill bars 26C, 26D and the third and fourth grinding mill troughs 28C, 28D, as described herein (see [link to document]). Figure 4B , 5B (and 6B).

[0072] The outer surface S of the first grinding mill bar 26A of the first grinding body 22 26A The outer surface S of the first grinding bar 36A of the second grinding body 32 36A A first gap G1 is defined between them. In the example in which the second grinding bar 26B of the first grinding body 22 and the second grinding bar 36B of the second grinding body 32 are both continuously inclined downwards, a gap S can be defined on the outer surface of the second grinding bar 26B. 26B The outer surface S of the second grinding mill bar 36B of the second grinding body 32 36B A gap G4 is defined between them, where G4 is greater than G1. One of the second grinding bars (e.g., the second grinding bar 26B of the first grinding body 22) slopes continuously downward and the other of the second grinding bars (e.g., the second grinding bar 36B of the second grinding body 32) extends substantially horizontally (in... Figure 9 In the example shown by the dashed line, the outer surface S of the second grinding mill bar 26B can be... 26B The outer surface S of the second fine grinding mill bar 36B 36B'A gap G5 is defined between them, where G5 is greater than G1. The second grinding bar 26B of the first grinding body 22 and the second grinding bar 36B of the second grinding body 32 both extend substantially horizontally (in... Figure 9 In the example shown by the dashed line, the outer surface S of the second grinding mill bar 26B can be... 26B' The outer surface S of the second fine grinding mill bar 36B 36B' The gap between them is defined by G6, where G6 is greater than G1. In some specific examples, G4 is greater than G5, and G5 is greater than G6.

[0073] like Figure 9 As shown, in an embodiment where one or both of the second grinding mill bars 26B and 36B are inclined, the outer surface S of the second grinding mill bars 26B and 36B 26B S 26B' S 36B S 36B' The distance between them may be a portion of the longitudinal length of one or both of the corresponding second grinding mill bars 26B and 36B (unmarked; see [link]). Figure 6A and 6B ) continuously increases. For example, when a fine grinding body (e.g., a first fine grinding body 22) includes an inclined second fine grinding bar 26B, the outer surface S of the second fine grinding bar 26B, 36B 26B S 36B' The distance between them can increase from the minimum distance corresponding to gap G6 to the maximum distance corresponding to the third gap G5. When both the grinding bodies 22 and 32 include inclined second grinding bars 26B and 36B, the outer surface S of the second grinding bars 26B and 36B... 26B S 36B The distance between them can be increased from the minimum distance corresponding to gap G6 to the maximum distance corresponding to the second gap G4.

[0074] exist Figure 8 and 9 In all the embodiments shown, when the rotatable grinding member (e.g., the first grinding member 20; see...) Figure 1 (relative to the stationary grinding member (e.g., the second grinding member 30 / 130; see also)) Figure 1 As it rotates, pulp containing wood fibers is supplied to the refining mill 10 (see...). Figure 1 The frame 66, for example, the inlet 16, enters the grinding space 60 defined between the first and second grinding bodies 22, 32 / 132. (See reference) Figure 8When wood fibers enter a portion of the grinding space 60 defined at least partially by the first grinding groove 28A of the first grinding body 22 and the grinding groove 138 of the second grinding body 132, the first and second grinding bodies 22, 132 are spaced apart to define a first gap G1 between the first grinding bar 26A of the first grinding body 22 and the conventional grinding bar 136 of the second grinding body 132, such that the grinding bars 26A and 136 interact with each other to grind the wood fibers, as described herein. It is believed that the first gap G1 should be less than about 0.9 mm (±0.05 mm) and preferably about 0.2 mm to about 0.9 mm (±0.05 mm) for grinding to occur. This range includes all values ​​and subranges thereof, including, for example, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, and 0.9 mm. In some examples, the first gap G1 can be from about 0.1 mm to about 0.5 mm (±0.05 mm). This range includes all values ​​and subranges thereof, including, for example, 0.1, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, and 0.5 mm.

[0075] Continue to refer to Figure 8 When wood fibers enter at least a portion of the grinding space 60 defined by the second grinding groove 28B of the first grinding body 22 and the grinding groove 138 of the second grinding body 132, the distance between the second grinding rod 26B of the first grinding body 22 and the grinding rod 136 of the second grinding body 132 increases, such that grinding is believed to stop and delamination begins. In an embodiment where the second grinding rod 26B is continuously inclined downward, the distance increases from the first gap G1 to the second gap G2. In an embodiment where the second grinding rod 26B extends substantially horizontally, the distance increases from the first gap G1 to the third gap G3. It is believed that the distance between the second grinding rod 26B of the first grinding body 22 and the grinding rod 136 of the second grinding body 132 (i.e., G2 or G3) should be from about 0.9 mm to about 1.5 mm (±0.05 mm) for delamination to occur. This range includes all values ​​and subranges within it, including, for example, 0.9, 0.95, 1.0, 1.05, 1.1, 1.15, 1.2, 1.25, 1.3, 1.35, 1.4, 1.45, and 1.5 mm.

[0076] refer to Figure 9When wood fibers enter at least a portion of the grinding space 60 defined by the first grinding chambers 28A and 38A of the first and second grinding bodies 22 and 32, respectively, the first and second grinding bodies 22 and 32 are spaced apart to define a first gap G1 between the first grinding bars 26A and 36A, such that the grinding bars 26A and 36A interact with each other to grind the wood fibers, as described herein. When wood fibers enter at least a portion of the grinding space 60 defined by the second grinding chambers 28B and 38B of the first and second grinding bodies 22 and 32, respectively, the distance between the second grinding bars 26B of the first grinding body 22 and the second grinding bars 36B of the second grinding body 32 increases to one of the gaps G4, G5, or G6, causing grinding to stop and loosening to begin. It is believed that the first gap G1 should be less than about 0.9 mm (±0.05 mm) and preferably about 0.2 mm to about 0.9 mm (±0.05 mm) for grinding to occur. This range includes all values ​​and subranges thereof, including, for example, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, and 0.9 mm. In some examples, the first gap G1 can be from about 0.1 mm to about 0.5 mm (±0.05 mm). This range includes all values ​​and subranges thereof, including, for example, 0.1, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, and 0.5 mm. It is also believed that gaps G4, G5, and G6 should be from about 0.9 mm to about 1.5 mm (±0.05 mm) to allow for sparse release. This range includes all values ​​and subranges therein, including, for example, 0.9, 0.95, 1.0, 1.05, 1.1, 1.15, 1.2, 1.25, 1.3, 1.35, 1.4, 1.45 and 1.5 mm, for a range of about 0.9 mm to about 1.5 mm.

[0077] refer to Figure 1 , 6A6B, 8, and 9 can be adjusted by applying axial pressure, for example, via a second motor 76 to at least one of the first or second grinding members 20, 30, to the grinding bodies 22, 32 / 132, defining gaps G1 and G2, G3, G4, G5, G6, defined between the grinding bodies 22, 32 / 132, and G6, G5, G6, G6, G7, G8, G9, G1, G1, G2, G3, G4, G5, G6, G6, G7, G8, G9, G1, G6 ... Then the fourth grinding member 50 applies an axial force to the wood pulp passing through the second grinding space 62, which in turn applies an axial force to the third grinding member 40, causing the third grinding member 40, the support member 70 and the second grinding member 30 to move inward toward the first grinding member 20.

[0078] By adjusting the positioning of the second grinding member 30 relative to the first grinding member 20 via the second motor 76 (manually controlled or via a controller / processor coupled to the second motor 76) and the lifting screw, the gap G1 defined between the grinding bars 26A, 36A, and 136 can be maintained at a substantially constant value. This ensures that the amount of power required to process a given quantity of pulp flowing through the grinding space 60 at a predetermined rotational speed, input / generated by the first motor 74 (manually controlled or via a controller / processor coupled to the first motor 74), is maintained at a predetermined input power level, monitored by the operator or the controller / processor controlling the first motor 74. For example, if the pulp flows at a rate of 151 gallons / minute through a 20-inch diameter... In the grinding space 60 of the Twinflo IIIB low-consistency grinding mill, and with the first motor 74 operating at a constant rotational speed of 800 RPM, the second motor 76 is controlled to move the second grinding member 30 relative to the first grinding member 20 until the power input from the first motor 74 equals 114 kW. When the power input from the first motor 74 equals 114 kW, it is assumed that the gap between the first and second grinding members 20 and 30 is 0.57 mm.

[0079] Continue to refer to Figure 1 , 6A6B, 8, and 9, it is believed that the gaps G2, G3, G4, G5, and G6 required to achieve the delamination can vary depending on the load or flow rate (i.e., liters / minute of pulp flowing through the refining space 60) experienced by the refining bodies 22, 32 / 132. For example, when the refining bodies 22, 32 / 132 are lightly loaded, when the fibers enter at least partially the portion of the refining space 60 defined by the second refining chambers 28B / 28B', 38B / 38B', for example, when the wood fibers move past the first radially outward position P2 / P 2' And / or at the third radially outward position P4, such as Figure 6A and 6B As shown, the fine grinding of wood fibers can be stopped and the loosening can begin almost immediately. When the fine grinding bodies 22, 32 / 132 are under heavy load, some fine grinding of the wood fibers can continue along at least a portion of the fine grinding space 60 defined at least partially by the second fine grinding chambers 28B / 28B', 38B / 38B'.

[0080] When the grinding bodies 22, 32 / 132 are under heavy load, the embodiment in which one or both of the second grinding bars 26B / 26B' of the first grinding body 22 and the second grinding bars 36B / 36B' of the second grinding body 32 are continuously inclined downwards can particularly advantageously ensure that a sufficient distance between the grinding bars 26B / 26B' and 136 / 36B / 36B' is achieved along at least a portion of the grinding space 60 defined at least partially by the second grinding grooves 28B / 28B' and 38B / 38B' to allow grinding to stop and loosening to occur. Furthermore, the grinding surfaces 24, 34 of the grinding bodies 22, 32 may wear and degrade over time. In particular, the first and third grinding bars 26A / 26A', 26C, 36A / 36A', 36C, which perform most of the high-intensity, high-energy fine grinding, may wear out faster than the second and fourth grinding bars 26B / 26B', 26D, 36B / 36B', 36D, which perform slag grinding, which is typically less intense and energy-intensive than fine grinding. The positions of the grinding bodies 22, 32 / 132 can be adjusted as described herein to position them on their outer surfaces. 26A S 36AWhen wear begins, the first gap G1 between the first and third grinding mill bars 26A / 26A', 26C, 36A / 36A', 36C is maintained at a substantially constant value. However, the gaps G2, G3, G4, G5, G6 between the second and fourth grinding mill bars 26B / 26B', 26D, 36B / 36B', 36D may not be adjustable. Therefore, embodiments in which one or both of the second grinding mill bars 26B / 26B', 36B / 36B' and / or one or both of the four grinding mill bars 36B / 36B', 36D are inclined are considered to allow the transition between the grinding zone and the loosening zone along the longitudinal length (not labeled; see below) of the second and fourth grinding mill bars 26B / 26B', 26D, 36B / 36B', 36D when the first and third grinding mill bars 26A / 26A', 26C, 36A / 36A', 36C are worn. Figure 6A and 6B It moves radially outward.

[0081] Figure 10 and 11 These are plan views of portions of the polished surfaces of the first polishing body 22' and the second polishing body 32', respectively, according to another embodiment of this disclosure. (See reference...) Figure 1 , 10 And 11, the first and second grinding bodies 22', 32' can be part of a grinding component, for example, as described herein, for a pulp grinding mill (e.g. Figure 1 The first and second grinding components 20 and 30 in the disc grinding mill 10 shown are illustrated. Each of the grinding components 20 and 30, each including a first and a second grinding body 22' and 32', can be associated with a main support frame including a fixed support frame 66 and a movable support frame 68 fixed to a first housing section 12. One grinding component, such as the first grinding component 20 including the first grinding body 22', can be fixed to the support frame 66 of the grinding mill 10 to define a non-rotating stator component. Another grinding component, such as the second grinding component 30 including the second grinding body 32', can be fixed to a support member 70 that rotates with a shaft 72 and defines a rotor associated with the main support frame, such that rotation of the rotor enables movement of the second grinding component 30 relative to the first grinding component 20. Third and fourth grinding components (not shown) having third and fourth grinding bodies similar to the first and second grinding bodies 22' and 32' can also be provided.

[0082] like Figure 10As shown, the first grinding body 22' comprises a plurality of segments 22A'-22C', which may be bolted together or otherwise attached together to form a disc-shaped grinding body 22' including a radially outer edge 27'. Each segment 22A'-22C' includes a plurality of elongated grinding bars 26' separated from each other by grinding grooves 28'. Although not shown in Figure 10 As shown, but it should be understood, other sections (not labeled) of the first grinding body 22' will similarly include grinding bars 26' and grinding grooves 28'. The grinding bars 26' extend radially outward from a radially inner position 23' toward the radially outer edge 27' of the first grinding body 22'. Each section 22A'-22C' of the first grinding body 22' may include one or more radially extending disc-shaped segments, said disc-shaped segments including at least one first disc-shaped segment 22B-1 and at least one second disc-shaped segment 22B-2.

[0083] like Figure 11 As shown, the second grinding body 32' includes a plurality of corresponding segments 32A'-32C', which may be bolted together or otherwise attached to form a disc-shaped grinding body 32' including a radially outer edge 37'. Each segment 32A'-32C' includes a plurality of elongated grinding bars 36' separated from each other by grinding grooves 38'. Although not shown in Figure 11 As shown, it should be understood that other sections (not labeled) of the second grinding body 32' will similarly include grinding mill bars 36' and grinding mill grooves 38'. The grinding mill bars 36' extend radially outward from a radially inner position 33' toward the radially outer edge 37' of the second grinding body 32'. Each section 32A'-32C' of the second grinding body 32' may include one or more radially extending disc-shaped segments, said disc-shaped segments including at least one first disc-shaped segment 32B-1 and at least one second disc-shaped segment 32B-2. Although not discussed in detail herein, Figure 1 The third and fourth grinding bodies 42 and 52 may include structures substantially similar to the first and second grinding bodies 22' and 32' as described herein.

[0084] Figure 10 and 11 At least one of the first and second grinding bodies 22', 32' includes one or more segments 22A'-22C', 32A'-32C' of grinding bars 26', 36' having at least one radially extending disc-shaped segment (e.g., 22B-1 and 32B-1), which include one or more characteristics different from those of the grinding bars 26', 36' in the adjacent radially extending disc-shaped segments (e.g., 22B-2 and 32B-2, respectively). Figure 12A and 12B This is a partial cross-sectional view, in which Figure 10 and 11The first and second grinding bodies 22' and 32' are spaced apart from each other and adjacent to each other and positioned relative to each other (see Figure 1 ).exist Figure 12A In the first grinding body 22', a first grinding bar 26-1, which may be located on the grinding surface 24-1 (also referred to herein as the first grinding surface) of at least one first disc-shaped segment 22B-1 of the first grinding body 22', is spaced apart from, adjacent to, and positioned relative to a third grinding bar 36-1, which may be located on the grinding surface 34-1 (also referred to herein as the third grinding surface) of at least one third disc-shaped segment 32B-1 of the second grinding body 32'. Figure 12B In the first grinding body 22', a second grinding bar 26-2 that may be located on the grinding surface 24-2 (also referred to herein as the second grinding surface) of at least one second disc segment 22B-2 of the first grinding body 22' is spaced apart from, adjacent to and positioned relative to, a fourth grinding bar 36-2 that may be located on the grinding surface 34-2 (also referred to herein as the fourth grinding surface) of at least one fourth disc segment 32B-2 of the second grinding body 32'.

[0085] For reference Figure 10 , 11 And 12A, the first grinding mill bar 26-1 is separated from each other by the first grinding mill trough 28-1 and may include F from the bottom of the corresponding adjacent first grinding mill trough 28-1 1' The first maximum height H extending upwards 10 The third grinding mill bars 36-1 are separated from each other by the third grinding mill troughs 38-1 and may include F from the bottom of the respective adjacent third grinding mill troughs 38-1. 3' The third maximum height H extending upwards 30 .like Figure 12A As shown, the first and third grinding mill bars 26-1 and 36-1 can be substantially similar to each other, and the maximum height H of the first and third bars is... 10 H 30 They can be basically equal.

[0086] refer to Figure 10 , 11 And 12B, the second grinding mill bar 26-2 is separated from each other by the second grinding mill trough 28-2 and may include F from the bottom of the adjacent second grinding mill trough 28-2. 2' The second maximum height H extending upwards 20 The fourth grinding mill bar 36-2 is separated from each other by the fourth grinding mill trough 38-2 and may include a section F from the bottom of the adjacent fourth grinding mill trough 38-2. 4' The fourth maximum height H extending upwards 40 .like Figure 12B As shown, the second and fourth grinding mill bars 26-2 and 36-2 can be substantially similar to each other, and the maximum height H of the second and fourth bars is...20 H 40 They can be substantially equal. All the grinding bars 26-1, 26-2, 36-1, and 36-2 within the corresponding disc segments 22B-1, 22B-2, 32B-1, and 32B-2 can include the same height relative to each other.

[0087] The second maximum height H of the second fine grinding mill bar 26-2 20 It can be less than the first maximum height H of the first fine grinding mill bar 26-1. 10 In some examples, when F from the bottom of the adjacent second fine grinding mill tank 28-2 2' During measurement, the second maximum height H 20 It can be compared to the first maximum height H 10 At least 0.35 mm (±0.05 mm). In other examples, when from the bottom F of the adjacent second fine grinding mill tank 28-2 2' During measurement, the second maximum height H 20 It can be compared to the first maximum height H 10 At least 0.7 mm (±0.05 mm). In another example, when from the bottom F of the corresponding adjacent first fine grinding mill tank 28-1 1' During measurement, the first maximum height H of the first fine grinding mill rod 26-1 10 The range can be from approximately 4.0 mm to approximately 10.0 mm (±0.5 mm). This range includes all values ​​and sub-ranges in between, including, for example, 4.0, 4.5, 5.0, 5.5, 6.0, 6.5, 7.0, 7.5, 8.0, 8.5, 9.0, 9.5, and 10.0 mm. In a specific example, when from the bottom F of the corresponding adjacent second fine grinding mill tank 28-2... 2' During measurement, the second maximum height H of the second fine grinding mill rod 26-2 was measured. 20 It can be compared to the first maximum height H 10 From approximately 0.35 mm to approximately 1.5 mm (±0.05 mm). This range includes all values ​​and sub-ranges in between, including, for example, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95, 1.0, 1.05, 1.1, 1.15, 1.2, 1.25, 1.3, 1.35, 1.4, 1.45, and 1.5 mm. In another specific example, when from the bottom F of the corresponding adjacent second fine grinding mill tank 28-2... 2' During measurement, the second maximum height H of the second fine grinding mill rod 26-2 was measured. 20 Comparable first maximum height H 10The width is from approximately 0.7 mm to approximately 1.5 mm (±0.05 mm). This range includes all values ​​and sub-ranges therebetween, including, for example, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95, 1.0, 1.05, 1.1, 1.15, 1.2, 1.25, 1.3, 1.35, 1.4, 1.45, and 1.5 mm. In another example, the first grinding mill bar 26-1 and the second grinding mill bar 26-2 may include a width of approximately 2.0 mm to approximately 8.0 mm (not shown; see [link to relevant documentation]) extending between the side edges of the respective grinding mill bars 26-1, 26-2. Figure 7 This range includes all values ​​and sub-ranges within it, including, for example, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5, 5.0, 5.5, 6.0, 6.5, 7.0, 7.5, and 8.0 mm. This can correspond to the second maximum H. 20 The fourth maximum height H of the fourth fine grinding mill bar 36-2 40 It can be smaller than or corresponding to the first maximum height H 10 The third maximum height H of the third fine grinding mill bar 36-1 30 .

[0088] refer to Figure 1 , 10 11, 12A, and 12B, when the second grinding member 30 rotates relative to the first grinding member 20, the grinding surface 34-1 of at least one third disc segment 32B-1 of the second grinding body 32' will pass through the grinding surface 24-1 of at least one first disc segment 22B-1 of the first grinding body 22', and the grinding surface 34-2 of at least one fourth disc segment 32B-2 of the second grinding body 32' will pass through the grinding surface 24-2 of at least one second disc segment 22B-2 of the first grinding body 22'. When the wood pulp is supplied to the frame 66 (e.g., inlet 16) of the grinding mill 10 and passes through the grinding space 60, and the grinding surface 34-1 of at least one third disc segment 32B-1 of the second grinding body 32' passes through the grinding surface 24-1 of at least one first disc segment 22B-1 of the first grinding body 22', including the third maximum height H 30 The third grinding mill bar 36-1 will be combined with the first maximum height H 10 The first and third grinding bars 26-1 are positioned relative to each other, such that the first and third grinding bars 26-1 and 36-1 grind a large amount of wood fibers. When the grinding surface 34-2 of at least one fourth disc segment 32B-2 of the second grinding body 32' passes through the grinding surface 24-2 of at least one second disc segment 22B-2 of the first grinding body 22', including the fourth maximum height H 40 The fourth grinding mill bar 36-2 will be combined with the second maximum height H 20The second and fourth grinding bars 26-2 are positioned relative to each other, such that the second and fourth grinding bars 26-2 and 36-2 break down or separate multiple bundles of wood fibers in the wood pulp. Low-intensity grinding may occur when the grinding surface 34-1 of at least one third disc segment 32B-1 of the second grinding body 32' passes through the grinding surface 24-2 of at least one second disc segment 22B-2 of the first grinding body 22', and when the grinding surface 34-2 of at least one fourth disc segment 32B-2 of the second grinding body 32' passes through the grinding surface 24-1 of at least one first disc segment 22B-1 of the first grinding body 22'.

[0089] like Figure 10 and 11 As shown, in some examples, one or more of the segments 22A'-22C' and 32A'-32C' of the corresponding fine-grinding bodies 22' and 32' may each include three radially extending disc-shaped segments 22B-1, 22B-1, 22B-3 and 32B-1, 32B-2, 32B-3. In some specific examples, two segments, such as 22B-1, 22B-3 and 32B-1, 32B-3, may include segments having a first or second maximum height H. 10 H 20 One of the grinding mill bars, and a segment, such as 22B-2 and 32B-2, may include a first or second maximum height H. 10 H 20 Another grinding mill bar in the process, wherein the second maximum height H 20 Less than the first maximum height H 10 For example, segments 22B-1 and 22B-3 may include a first grinding bar 26-1, segments 32B-1 and 32B-3 may include a third grinding bar 36-1, segment 22B-2 may include a second grinding bar 26-2, and segment 32B-2 may include a fourth grinding bar 36-2. In other examples (not shown), one or more of segments 22A'-22C' and 32A'-32C' may each include only two segments of the grinding bar or may each include four or more segments of the grinding bar. In yet another example (not shown), one or more of segments 22A'-22C' and 32A'-32C' may not include individual segments, such that the entire segment includes a grinding bar of one height. It should be understood that the grinding body according to this disclosure, such as one of the grinding bodies 22' and 32', may be paired with a grinding body that includes conventional grinding bars (e.g., grinding bars all having the same height).

[0090] It is believed that the gap between the opposing first and third grinding mill bars 26-1, 36-1 should be less than about 0.9 mm (±0.05 mm) and preferably about 0.2 mm to about 0.9 mm (±0.05 mm) to allow for grinding, and the gap between the opposing second and fourth grinding mill bars 26-2, 36-2 should be about 0.9 mm to about 1.5 mm (±0.05 mm) to allow for loosening. Each of these ranges includes all values ​​and sub-ranges therein; for example, the range from about 0.2 mm to about 0.9 mm includes 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, and 0.9, and the range from about 0.9 mm to about 1.5 mm includes 0.9, 0.95, 1.0, 1.05, 1.1, 1.15, 1.2, 1.25, 1.3, 1.35, 1.4, 1.45, and 1.5 mm. In some examples, the gap between the opposing first and third grinding mill bars 26-1, 36-1 can be from about 0.1 mm to about 0.5 mm (±0.05 mm). This range includes all values ​​and subranges within it, including, for example, 0.1, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, and 0.5 mm.

[0091] Figure 19A and 19B It is a first grinding body 1022, 1022' having corresponding first grinding surfaces 1024, 1024' and a second grinding body 1032, 1032' having corresponding second grinding surfaces 1034, 1034', similar to Figure 6A and 6B A partial cross-sectional view. As described in detail herein, the first and second grinding bodies 1022 / 1022', 1032 / 1032' can be used in pulp refiners (e.g., Figure 1 The grinding components (e.g., in the disc grinding mill 10 shown) in the image Figure 1A portion of the corresponding grinding components 20, 30 in the grinding mill 10. Each of the grinding components 20, 30, including the first and second grinding bodies 1022 / 1022', 1032 / 1032', can be associated with a main support frame including a fixed support frame 66 and a movable support frame 68 fixed to the first housing section 12. One grinding component, such as the first grinding component 20 including the first grinding body 1022 / 1022A', can be fixed to the support frame 66 of the grinding mill 10 to define a non-rotating stator component. Another grinding component, such as the second grinding component 30 including the second grinding body 1032 / 1032', can be fixed to a support member 70, which rotates with the shaft 72 and defines a rotor associated with the main support frame, such that rotation of the rotor enables movement of the second grinding component 30 relative to the first grinding component 20. The first and second grinding bodies 1022 / 1022', 1032 / 1032' can each include multiple sections (not shown; see Figure 2 and 3 (22A-22C and 32A-32C in the above), the segments can be bolted together or otherwise attached together to form a disc-shaped fine grinding body, including corresponding radial inner edges 1023, 1023' and 1033, 1033' and radial outer edges 1027, 1027' and 1037, 1037'.

[0092] refer to Figure 19A As shown, the polished surfaces 1024 and 1034 may each include a plurality of elongated polishing bars 1026 and 1036, including first polishing bars 1026A and 1036A and second polishing bars 1026B and 1036B separated from each other by corresponding first polishing grooves 1028A and 1038A and second polishing grooves 1028B and 1038B (the first and second polishing bars 1026A / 1036A and 1026B / 1036B may also be referred to herein as first and second polishing bar elements). In some examples, the first and second polishing grooves 1028A, 1028B and 1038A, 1038B may have a width of about 2.0 mm to about 6.0 mm (not shown; see [link]). Figure 4A and 5A W in G The first and second grinding mill bars 1026A, 1026B and 1036A and 1036B may include a width of about 2.0 mm to about 8.0 mm (not shown; see [link]). Figure 7 W in 26Each of these ranges includes all values ​​and sub-ranges therebetween; for example, the range of about 2.0 mm to about 6.0 mm includes 2.0, 2.5, 3.0, 3.5, 4.0, 4.5, 5.0, 5.5, and 6.0 mm, and the range of about 2.0 mm to about 8.0 mm includes 2.0, 2.5, 3.0, 3.5, 4.0, 4.5, 5.0, 5.5, 6.0, 6.5, 7.0, 7.5, and 8.0 mm. The grinding bars 1026 and 1036 may be inclined at various angles on the respective grinding surfaces 1024 and 1034, and each segment of the grinding bodies 1022 and 1032 may include one or more segments (not labeled) of the grinding bars 1026 and 1036 inclined in different directions (see [reference]). Figure 2 and 3 ).

[0093] The first and second grinding mill bars 1026 and 1036 both extend radially outward from their radially inner positions (i.e., radially inner edges 1023 and 1033) toward the radially outer edges 1027 and 1037 of their respective grinding bodies 1022 and 1032. Specifically, each of the first grinding mill bars 1026A and 1036A extends radially outward from a first radially inward position P on the grinding surfaces 1024 and 1034. 1000 The first radially outward position P extends onto the finely ground surfaces 1024 and 1034 2000 As described herein, each of the second grinding mill bars 1026B and 1036B extends from a second radially inward position on the grinding surfaces 1024 and 1034 to a second radially outward position P on the grinding surfaces 1024 and 1034. 3000 The second radially outward position P 3000 It can be located outward from the first radial direction in the general direction of wood fiber travel. 2000 Closer to the outermost portion of the grinding bodies 1022, 1032, such as the radial outer edges 1027, 1037. In some examples, the first radially inward position P 1000 This may include a position at or near the radially inner edges 1023, 1033. In some embodiments, the second grinding mill bars 1026B, 1036B may be integral with the first grinding mill bars 1026A, 1036A, such that the second radially inward position of the second grinding mill bars 1026B, 1036B is adjacent to the first radially outward position P of the first grinding mill bars 1026A, 1036A. 2000 They are basically the same, and the second grinding mill bars 1026B and 1036B are located radially outward from position P of the first mill. 2000 Extending to the second radially outward position P 3000In other embodiments (not shown), the first grinding mill bars 1026A and 1036A can be radially separated from the second grinding mill bars 1026B and 1036B by space. The second grinding mill bars 1026B and 1036B may include a longitudinal length L of about 0.6 cm to about 10 cm, and preferably about 2 cm to about 10 cm. 1000 As described above, the finely ground surfaces 1024 and 1034 may include baffles (not shown; see [link to baffle]) disposed in at least a portion of the first fine grinding mill tanks 1028A and 1038A. Figure 4A , 5A (29 and 39 in 7), wherein the baffle may include a height that is substantially the same as or less than the height of the adjacent first grinding bar 1026A, 1036A.

[0094] Continue to refer to Figure 19A The first grinding mill bars 1026A and 1036A include F from the bottom of the adjacent first grinding mill troughs 1028A and 1038A. 1000 The first height H extending upwards 1000 In some examples, the first height H 1000 This can be the maximum height of the first grinding mill bars 1026A and 1036A. The first grinding mill bars 1026A and 1036A can extend substantially horizontally, such that the first height H... 1000 The longitudinal length (unmarked) of the first grinding mill bars 1026A and 1036A can be substantially constant, for example, at the first radially inward position P. 1000 and the first radial outward position P 2000 Between, such as Figure 19A The example is shown in the figure. In some examples, when F is drawn from the bottom of adjacent first grinding mill tanks 1028A, 1038A 1000 During measurement, the first height H of the first grinding mill bars 1026A and 1036A was... 1000 It can be from about 4.0 mm to about 10.0 mm (±0.5 mm). This range includes all values ​​and sub-ranges in between, including, for example, 4.0, 4.5, 5.0, 5.5, 6.0, 6.5, 7.0, 7.5, 8.0, 8.5, 9.0, 9.5 and 10.0 mm.

[0095] The second grinding mill bars 1026B and 1036B include the bottom F of the adjacent second grinding mill troughs 1028B and 1038B. 2000 The second height H extending upwards 2000 The second height H 2000 It is the minimum height of the second grinding mill bars 1026B and 1036B and the second radially inward position of the second grinding mill bars 1026B and 1036B (e.g., P). 2000 ) spaced apart (first and second heights H)1000 H 2000 (These may also be referred to herein as the first and second bar heights). In some embodiments, from the bottom F of adjacent second grinding mill tanks 1028B, 1038B 2000 The second height H of the upward-extending second grinding mill bars 1026B and 1036B 2000 It can be greater than zero, such as Figure 19A As shown by the solid line in the diagram. For example, the second height H 2000 The height can be from approximately 2.0 mm to approximately 4.0 mm (±0.2 mm). This range includes all values ​​and sub-ranges therebetween, including, for example, 2.0, 2.2, 2.4, 2.6, 2.8, 3.0, 3.2, 3.4, 3.6, 3.8, and 4.0 mm. In other embodiments, the second height H... 2000 It can be slightly greater than zero. For example, the second grinding mill bars 1026B and 1036B at their minimum height can be slightly higher than the bottom F of the adjacent second grinding mill troughs 1028B and 1038B. 2000 Or level with it, such as Figure 19A The text is shown using dashed lines.

[0096] The second height H of the second grinding mill bars 1026B and 1036B 2000 The first height H can be compared with the first grinding mill rod 1026A and 1036A. 1000 The difference is at least approximately 0.35 mm (±0.05 mm). In some examples, the second height H 2000 It can be compared to the first height H 1000 The minimum diameter is 0.7 mm (±0.05 mm). In some specific examples, when the diameter is at least 0.7 mm (±0.05 mm) from the bottom of the adjacent second fine grinding mill tanks 1028B and 1038B, the diameter is at least 0.7 mm (±0.05 mm). 2000 During measurement, the second height H of the second grinding mill bars 1026B and 1036B was measured. 2000 It can be compared to the first height H 1000 From approximately 0.35 mm to approximately 7.0 mm (±0.05 mm). This range includes all values ​​and sub-ranges within this range, including, for example, 0.35, 0.5, 1.0, 1.5, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5, 5.0, 5.5, 6.0, 6.5, and 7.0 mm. In other specific examples, the second height H 2000 It can be compared to the first height H 1000 From approximately 0.7 mm to approximately 7.0 mm (±0.05 mm). This range includes all values ​​in between and sub-ranges, including, for example, 0.7, 1.0, 1.5, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5, 5.0, 5.5, 6.0, 6.5, and 7.0 mm. In another specific example, the second height H 2000 It can be compared to the first height H 1000Smaller than approximately 0.7mm to approximately 5.0mm (±0.05mm), or larger than the first height H 1000 Smaller than 2.0 mm to about 3.0 mm (±0.05 mm). Each of these ranges includes all values ​​and sub-ranges therebetween; for example, the range of about 0.7 mm to about 5.0 mm includes 0.7, 1.0, 1.5, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5, and 4.5 mm, and the range of about 2.0 mm to about 3.0 mm includes 2.0, 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 2.8, 2.9, and 3.0 mm. At the second height H 2000 In embodiments where the height is slightly greater than zero, the first and second heights H 1000 H 2000 The difference between them can be essentially the entire height of the first grinding mill bars 1026A and 1036A. For example, the height H of the first grinding mill bars 1026A and 1036A... 1000 With a height H of approximately 10.0 mm, the second height H of the second grinding mill bars 1026B and 1036B is... 2000 It can be compared to the first height H 1000 Approximately 10.0mm in size.

[0097] like Figure 19A As shown, in some examples, the second grinding mill bars 1026B and 1036B can be positioned radially outward at a first radial position P. 2000 Second radial outward position P 3000 At least a portion of each of the second grinding mill bars 1026B, 1036B extending between them slopes substantially continuously downward. In some specific examples, the height of the second grinding mill bars 1026B, 1036B may be along substantially the entire longitudinal length L of the second grinding mill bars 1026B, 1036B. 1000 Continuously decreasing. For example, the second grinding mill bars 1026B and 1036B may have a maximum height (not separately marked), which occurs near the first radially outward position P. 2000 The position and the first height H of the first grinding mill bars 1026A and 1036A 1000 Basically the same, the second grinding mill bars 1026B and 1036B are positioned outward from the first radial direction at position P. 2000 To the second radial outward position P 3000 It slopes downwards almost continuously. The second (minimum) height H of the second grinding mill bars 1026B and 1036B. 2000 It can appear at the adjacent second radially outward position P 3000 At the location.

[0098] In some examples, the first and second grinding members 20 and 30, including the first and second grinding bodies 1022 and 1032, can be arranged such that the first grinding surface 1024 faces the second grinding surface 1034 (not shown; see example). Figure 1 , 8 (and 9), wherein the first grinding member 20 and the second grinding member 30 are spaced apart to define a grinding space between the respective grinding surfaces 1024, 1034 (see 9). Figure 1 (60) as detailed herein. At least a portion of the grinding bar 1026 of the first grinding body 1022 may be positioned opposite (i.e. facing) to at least a portion of the grinding bar 1036 of the second grinding body 1032 to define a gap between the opposing portions of the grinding bars 1026, 1036 (see 60). Figure 8 and 9 Specifically, at least a portion of the first grinding bar 1026A of the first grinding body 1022 can be positioned opposite (i.e. facing) to at least a portion of the first grinding bar 1036A of the second grinding body 1032, and at least a portion of the second grinding bar 1026B of the first grinding body 1022 can be positioned opposite (i.e. facing) to at least a portion of the second grinding bar 1036B of the second grinding body 1032.

[0099] When wood pulp containing wood fibers is supplied to the frame 66 of the refiner 10, such as Figure 1 As shown and described above, axial force or pressure can be applied to one or both of the grinding members 20, 30, the adjustment of which is limited by the size of the gap between the first and second grinding members 20, 30. The first grinding bars 1026A, 1036A can be adapted to grind wood fibers in pulp, while the second grinding bars 1026B, 1036B can be adapted to break down or separate fiber bundles. Due to the first height H of the first grinding bars 1026A, 1036A... 2000 The second height H is greater than that of the second grinding mill bars 1026B and 1036B. 2000 Therefore, when the fibers pass through a portion of the grinding space (e.g., a grinding zone, as described above) defined at least partially by the first grinding mill grooves 1028A, 1038A, the wood fibers are subjected to high-intensity shear and compressive forces. The first grinding mill bars 1026A, 1036A interact with each other or with conventional grinding mill bars to grind a large number of wood fibers in the wood pulp. When the fibers enter a portion of the grinding space (e.g., a disintegration zone, as described above) defined at least partially by the second grinding mill grooves 1028B, 1038B, the intensity of the forces applied to the fibers decreases in response to the decreasing height, which is believed to break up or separate the multiple bundles of wood fibers formed during grinding without further grinding or with only minimal grinding of the fibers.

[0100] In this example, the gap between the opposing portions of the second grinding mill bars 1026B and 1036B can be from about 0.9 mm to about 20.0 mm (±0.05 mm). This range includes all values ​​and sub-ranges therein, including, for example, 0.9, 1.0, 1.5, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5, 5.0, 5.5, 6.0, 6.5, 7.0, 7.5, 8.0, 8.5, 9.0, 9.5, 10.0, 10.5, 11.0, 11.5, 12.0, 12.5, 13.0, 13.5, 14.0, 14.5, 15.0, 15.5, 16.0, 16.5, 17.0, 17.5, 18.0, 18.5, 19.0, 19.5, and 20.0 mm. In embodiments where the second grinding mill bars 1026B and / or 1036B are substantially continuously inclined downward along at least a portion of the second grinding mill bars 1026B, 1036B, the gap may be radially outward along at least a portion of the second grinding mill bars 1026B, 1036B, i.e., at a second radially inward position from the second grinding mill bars 1026B, 1036B (e.g., P). 2000 Extending to the second radially outward position P 3000 The gap can be increased in the direction of [the direction of the gap]. In some examples, the gap can be increased along approximately the entire longitudinal length L of the second grinding mill bars 1026B and 1036B. 1000 Increase. It is believed that the second (minimum) height H of the second grinding mill bars 1026B and 1036B is increased. 2000 The first height H should be greater than that of the first grinding mill bars 1026A and 1036A. 1000 To reduce the size by at least approximately 0.35 mm (±0.05 mm) in order to stop fine grinding of the fibers and begin disintegration.

[0101] In other examples, Figure 19A One of the fine grinding bodies 1022 and 1032 shown can be used with a conventional fine grinding body (not shown; see [link]). Figure 8 (See 132) Pairing, the conventional grinding body includes a conventional grinding bar having a uniform height along substantially its entire longitudinal length. For example, the first grinding member 20 may include the first grinding body 1022, while the second grinding member 30 may include a conventional grinding body. The grinding members 20, 30 may be arranged such that they face each other, with at least a portion of the first and second grinding bars 1026A, 1026B positioned opposite (i.e. facing) at least a portion of the conventional grinding bar to define a gap between the opposing portions (see 132). Figure 8 and 9As described herein, pulp of wood pulp can be supplied, and axial force or pressure can be applied to one or both of the grinding members 20, 30 to adjust the size of the gap, wherein the first grinding bar 1026A is adapted to grind the wood fibers in the pulp and the second grinding bar 1026B is adapted to break down or separate fiber bundles. In this example, the gap between the opposite portions of the second grinding bar 1026B and the conventional grinding bar can be from about 0.9 mm to about 10.0 mm (±0.05 mm). This range includes all values ​​and sub-ranges therein, including, for example, 0.9, 1.0, 1.5, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5, 5.0, 5.5, 6.0, 6.5, 7.0, 7.5, 8.0, 8.5, 9.0, 9.5, and 10.0 mm. In embodiments where the second grinding mill bar 1026B is inclined, the gap may increase in a radially outward direction along at least a portion of the second grinding mill bar 1026B, as described herein, and may extend along substantially the entire longitudinal length L of the second grinding mill bar 1026B. 1000 Increase. In this example, the second (minimum) height H of the second grinding mill bar 1026B is believed to be... 2000 The first height H should be greater than that of the first grinding mill bar 1026A / 1036A. 1000 To reduce the size by at least approximately 0.7 mm (±0.05 mm) in order to stop fine grinding of the fibers and begin disintegration.

[0102] In both examples, it is believed that the gap between opposing portions of the grinding mill bars should be less than about 0.9 mm (±0.05 mm) for grinding (e.g., between opposing portions of the first grinding mill bars 1026A and 1036A, or between opposing portions of the first grinding mill bars 1026A / 1036A and a conventional grinding mill bar). In some cases, the gap in the grinding zone may be less than about 0.7 mm (±0.05 mm). In some specific cases, the gap may be from about 0.1 mm to about 0.5 mm (±0.05 mm). This range includes all values ​​in between and sub-ranges, including, for example, 0.1, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, and 0.5 mm. It is also believed that the gap should be from about 0.9 mm to about 2.0 mm (±0.05 mm) to allow for scrambling (e.g., between opposite portions of the second grinding mill bars 1026B, 1036B or between opposite portions of the second grinding mill bars 1026B / 1036B and conventional grinding mill bars). This range includes all values ​​and sub-ranges therein, including, for example, 0.9, 1.0, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, and 2.0 mm. As mentioned above, the gap along at least a portion of the second grinding mill bars 1026B / 1036B can be much larger than about 2.0 mm, for example, up to about 20.0 mm in some cases. This larger gap can be used to address unavoidable wear, which will reduce the height H of the grinding mill bars 1026A, 1036A, 1026B, 1036B. 1000 H 2000 The position of the grinding body can be adjusted as described herein to maintain the gap at a desired value when the grinding surface begins to wear. Specifically, embodiments in which the second grinding bars 1026B, 1036B are substantially continuously inclined downwards along at least a portion of each second grinding bar 1026B, 1036B are considered to allow the transition between the grinding zone and the loosening zone along the longitudinal length L of the second grinding bars 1026B, 1036B. 1000 The radial outward movement allows the gap for shaving to be maintained from approximately 0.9 mm to approximately 2.0 mm throughout the entire lifespan of the finely ground component.

[0103] refer to Figure 19BThe grinding bodies 1022' and 1032' may include corresponding grinding surfaces 1024' and 1034'. Each grinding surface includes multiple elongated grinding bars 1026' and 1036', including first grinding bars 1026A' and 1036A', second grinding bars 1026B' and 1036B', third grinding bars 1026C and 1036C, and fourth grinding bars 1026D and 1036D. The first and second grinding bars 1026A', 1036A', 1026B', and 1036B' may be substantially similar to the first and second grinding bars 1026A', 1036A', 1026B', and 1036B, such as... Figure 19A As shown and described herein, the first grinding mill bars 1026A' and 1036A' can be separated from each other by the first grinding mill grooves 1028A' and 1038A', and the second grinding mill bars 1026B' and 1036B' can be separated from each other by the second grinding mill grooves 1028B' and 1038B'. The third grinding mill bars 1026C and 1036C can be separated from each other by the third grinding mill grooves 1028C and 1038C, and the fourth grinding mill bars 1026D and 1036D can be separated from each other by the fourth grinding mill grooves 1028D and 1038D.

[0104] Each of the first grinding mill bars 1026A' and 1036A' can be positioned radially inward from the first radially inward position P on the grinding surfaces 1024' and 1034'. 1000' Extending to the first radially outward position P 2000' As described herein, each of the second grinding mill bars 1026B' and 1036B' can extend from a second radially inward position on the grinding surfaces 1024' and 1034' to a second radially outward position P on the grinding surfaces 1024' and 1034'. 3000' As described herein, each of the third grinding mill bars 1026C and 1036C can extend from a third radially inward position on the grinding surfaces 1024' and 1034' to a third radially outward position P on the grinding surfaces 1024' and 1034'. 4000 As described herein, each of the fourth grinding mill bars 1026D and 1036D can extend from a fourth radially inward position on the grinding surfaces 1024' and 1034' to a fourth radially outward position P on the grinding surfaces 1024' and 1034'. 5000 Fourth radial outward position P 5000 It can be compared with the first, second and third radially outward positions P 2000' P 3000' and P 4000Closer to the outermost portions of the grinding bodies 1022' and 1032', such as the radial outer edges 1027' and 1037'. The second and fourth grinding bars 1026B' / 1036B' and 1026D / 1036D may include a corresponding longitudinal length L of about 0.6 cm to about 10 cm, preferably about 2 cm to about 10 cm. 1000' L 2000 In some examples, the first and / or second grinding bars 1026A', 1036A', 1026B', 1036B' may extend radially outward by a shorter distance compared to the first and second grinding bars 1026A, 1036A, 1026B, 1036B. As described above, the grinding surfaces 1024', 1034' may include baffles (not shown; see [link to documentation]) disposed in at least a portion of the first and third grinding grooves 1028A, 1038A', and 1028C / 1038C. Figure 4B and 5B (29 and 39 in the text), wherein the baffle may include a height substantially the same as or less than the height of the adjacent first and / or third grinding mill bars 1026A' / 1036A' and 1026C / 1036C.

[0105] In some embodiments, such as Figure 19B As shown, the second grinding mill bars 1026B' and 1036B' can be integrally formed with the first grinding mill bars 1026A' and 1036A'; the third grinding mill bars 1026C and 1036C can be integrally formed with the second grinding mill bars 1026B' and 1036B'; and / or the fourth grinding mill bars 1026D and 1036D can be integrally formed with the third grinding mill bars 1026C and 1036C. For example, when the first and second grinding mill bars 1026A' / 1036A' and 1026B' / 1036B' are integrally formed with each other, the second radially inward position of the second grinding mill bars 1026B' and 1036B' can be adjacent to the first radially outward position P of the first grinding mill bars 1026A' and 1036A'. 2000' They are basically the same, and the second grinding mill bars 1026B' and 1036B' can be positioned radially outward from the first radial position P. 2000' Extending to the second radially outward position P 3000' When the second and third grinding mill bars 1026B' / 1036B' and 1026C / 1036C are integrally formed, the third radially inward position of the third grinding mill bars 1026C and 1036C can be aligned with the second radially outward position P of the second grinding mill bars 1026B' and 1036B'. 3000' They are basically the same, and the third grinding mill bars 1026C and 1036C can be positioned from the second radial outward position P. 3000' Extending to the third radially outward position P 4000When the third and fourth grinding mill bars 1026C / 1036C and 1026D / 1036D are integrally formed, the fourth radial inward position of the fourth grinding mill bars 1026D and 1036D can be aligned with the third radial outward position P of the third grinding mill bars 1026C and 1036C. 4000 They are basically the same, and the fourth grinding mill bars 1026D and 1036D can be positioned from the third radial outward position P. 4000 Extending to the fourth radially outward position P 5000 In other embodiments (not shown), the first grinding mill bars 1026A' and 1036A' can be radially separated from the second grinding mill bars 1026B' and 1036B' by space, the second grinding mill bars 1026B' and 1036B' can be radially separated from the third grinding mill bars 1026C and 1036C by space, and / or the third grinding mill bars 1026C and 1036C can be radially separated from the fourth grinding mill bars 1026D and 1036D by space.

[0106] Continue to refer to Figure 19B The first and third grinding mill bars 1026A' / 1036A' and 1026C / 1036C include corresponding first heights H extending upward from the bottoms F1000' and F3000 of the respective adjacent first and third grinding mill troughs 1028A' / 1038A' and 1028C / 1038C. 1000' and the third height H 3000 The first and third heights H1000' and H3000 can be the maximum heights of the first and third grinding mill bars 1026A' / 1036A' and 1026C / 1036C, respectively. In some examples, the first and third grinding mill bars 1026A' / 1036A' and 1026C / 1036C can extend substantially horizontally, such that the first and third heights H1000' and H3000 can be substantially constant along the longitudinal length (unmarked) of the first and third grinding mill bars 1026A' / 1036A' and 1026C / 1036C, for example, at the first radially inward position P of the first grinding mill bars 1026A' and 1036A'. 1000' and the first radial outward position P 2000' Between and at the third radially inward position of the third grinding mill bars 1026C and 1036C (e.g., P). 3000' ) and the third radial outward position P 4000 Between. In some examples, when from the bottom F of the corresponding adjacent first and third grinding mill tanks 1028A' / 1038A' and 1028C / 1038C. 1000' F 3000 During measurement, the first and third heights H of the first and third grinding mill bars 1026A' / 1036A' and 1026C / 1036C were measured. 1000' H3000 It can be from about 4.0 mm to about 10.0 mm (±0.5 mm). This range includes all values ​​and sub-ranges in between, including, for example, 4.0, 4.5, 5.0, 5.5, 6.0, 6.5, 7.0, 7.5, 8.0, 8.5, 9.0, 9.5 and 10.0 mm.

[0107] The second and fourth grinding mill bars 1026B' / 1036B' and 1026D / 1036D may include the bottom F of the corresponding adjacent second and fourth grinding mill troughs 1028B' / 1038B' and 1028D / 1038D. 2000' F 4000 The corresponding second height H extending upwards 2000' and the fourth height H 4000 Second altitude H 2000' It is the minimum height of the second grinding mill bars 1026B' and 1036B' and the second radially inward position of the second grinding mill bars 1026B' and 1036B' (e.g., P). 2000' (Separated by) the fourth height H 4000 It is the minimum height of the fourth grinding mill bars 1026D and 1036D and the fourth radially inward position of the fourth grinding mill bars 1026D and 1036D (e.g., P). 4000 () spaced apart. In some embodiments, from the bottom F of adjacent second grinding mill tanks 1028B', 1038B' 2000' The second height H of the upwardly extending second grinding mill bars 1026B' and 1036B' 2000' And / or from the bottom F of the adjacent fourth fine grinding mill tanks 1028D, 1038D 4000 The fourth height H of the upward-extending fourth grinding mill bars 1026D and 1036D 4000 It can be greater than zero, such as Figure 19B As shown by the solid line in the diagram. For example, the second height H 2000' and / or fourth height H 4000 The height can be from approximately 2.0 mm to approximately 4.0 mm (±0.2 mm). This range includes all values ​​and sub-ranges therebetween, including, for example, 2.0, 2.2, 2.4, 2.6, 2.8, 3.0, 3.2, 3.4, 3.6, 3.8, and 4.0 mm. In other embodiments, the second height H... 2000' and / or fourth height H 4000 It can be slightly greater than zero. For example, the second grinding mill bars 1026B', 1036B' and / or the fourth grinding mill bars 1026D, 1036D can be slightly higher than the bottom F of the corresponding adjacent second or fourth grinding mill troughs 1028B' / 1038B', 1028D / 1038D at their minimum height. 2000' F 4000 Or level, such as Figure 19B As shown by the dashed line in the image.

[0108] The second height H of the second grinding mill bars 1026B' and 1036B' 2000' And / or the fourth height H of the fourth grinding mill bar 1026D, 1036D 4000 The first height H of the first grinding mill bars 1026A' and 1036A' can be compared respectively. 1000' And / or the third height H of the third grinding mill bar 1026C, 1036C 3000 The difference is at least approximately 0.35 mm (±0.05 mm). In some examples, the second height H 2000' and the fourth height H 4000 They can be compared to the first height H. 1000' and the third height H 3000 The minimum diameter is 0.70 mm (±0.05 mm). In some specific examples, when the diameter is at the bottom F of the adjacent second fine grinding mill tanks 1028B', 1038B', ... 2000' The second height H of the second grinding mill bars 1026B' and 1036B' was measured during the second grinding mill. 2000' And / or when from the bottom F of the adjacent fourth fine grinding mill tanks 1028D, 1038D 4000 The fourth height H of the fourth grinding mill bars 1026D and 1036D during measurement 4000 They can be compared to the first height H. 1000' and the third height H 3000 From approximately 0.35 mm to approximately 7.0 mm (±0.05 mm). This range includes all values ​​and sub-ranges within this range, including, for example, 0.35, 0.5, 1.0, 1.5, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5, 5.0, 5.5, 6.0, 6.5, and 7.0 mm. In other specific examples, the second height H 2000' and the fourth height H 4000 They can be compared to the first height H. 1000' and the third height H 3000 From approximately 0.7 mm to approximately 7.0 mm (±0.05 mm). This range includes all values ​​in between and sub-ranges, including, for example, 0.7, 1.0, 1.5, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5, 5.0, 5.5, 6.0, 6.5, and 7.0 mm. In another specific example, the second height H 2000' and the fourth height H 4000 They can be compared to the first height H. 1000' and the third height H 3000 The difference is approximately 0.7 mm to approximately 5.0 mm (±0.05 mm), or respectively compared to the first height H. 1000' and the third height H 3000The range is from approximately 2.0 mm to approximately 3.0 mm (±0.05 mm). Each of these ranges includes all values ​​and sub-ranges therebetween; for example, the range from approximately 0.7 mm to approximately 5.0 mm includes 0.7, 1.0, 1.5, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5, and 4.5 mm, and the range from approximately 2.0 mm to approximately 3.0 mm includes 2.0, 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 2.8, 2.9, and 3.0 mm. The second and / or fourth height H is described in the text. 2000' H 4000 In embodiments where the height is slightly greater than zero, the first and second heights H 1000' H 2000' Between and / or the third and fourth heights H 3000 H 4000 The difference can be the approximate total height of the first and / or third grinding mill bars 1026A' / 1036A' and 1026C / 1036C. For example, in the first and third heights H... 1000' H 3000 With a height of approximately 10.0 mm, the second and fourth heights H 2000' H 4000 It can be compared to the first and third heights H 1000' H 3000 Approximately 10.0mm in size.

[0109] like Figure 19B As shown, in some examples, the second grinding mill bars 1026B', 1036B' and / or the fourth grinding mill bars 1026D, 1036D may be substantially continuously inclined downwards along at least a portion of each grinding mill bar 1026B', 1036B', 1026D, 1036D. For example, the second grinding mill bars 1026B', 1036B' may be inclined downwards along a first radially outward position P. 2000' Second radial outward position P 3000 At least a portion extending between them slopes substantially continuously downwards, and / or the fourth grinding mill bars 1026D, 1036D can be positioned radially outwards at position P in the third radial direction. 4000 and the fourth radial outward position P 5000 At least a portion extending between them slopes substantially continuously downwards. In some specific examples, the height of the second grinding mill bars 1026B', 1036B' and / or the fourth grinding mill bars 1026D, 1036D can be along their respective substantially entire longitudinal length L. 1000' L 2000 Continuously decreasing. For example, the second grinding mill bars 1026B' and 1036B' may have a maximum height (not individually marked), which appears at the first radially outward position P. 2000'At adjacent positions and at the first height H of the first grinding mill bars 1026A' and 1036A' 1000' Basically the same, the second grinding mill bars 1026B' and 1036B' are located at position P from the first radial direction outward. 2000' To the second radial outward position P 3000' The slope is generally continuous downward. The fourth grinding mill bars 1026D and 1036D may similarly have a maximum height (not separately marked), which occurs at the radially outward position P of the third grinding mill. 4000 At adjacent positions and at the third height H of the third grinding mill bars 1026C and 1036C 3000 Basically the same, the fourth grinding mill bars 1026D and 1036D are located radially outward from position P of the third mill. 4000 To the fourth radial outward position P 5000 It slopes downwards almost continuously. The second (minimum) height H of the second grinding mill bars 1026B' and 1036B'. 2000' It can appear at the second radially outward position P 3000' At adjacent positions, and at the fourth (minimum) height H of the fourth grinding mill bars 1026D and 1036D. 4000 It can appear at the fourth radially outward position P 5000 At adjacent locations.

[0110] In some examples, the first and second grinding members 20 and 30, including the first and second grinding bodies 1022' and 1032', can be arranged such that the first and second grinding surfaces 1024' and 1034' face each other (not shown; see example). Figure 1 , 8 and 9) and limit the fine grinding space (see Figure 1 (60) as detailed herein. At least a portion of the grinding bar 1026' of the first grinding body 1022' is positioned opposite (i.e. facing) to at least a portion of the grinding bar 1036' of the second grinding body 1032' to define a gap between the opposing portions of the grinding bars 1026', 1036' (see 60). Figure 8 and 9 Specifically, at least a portion of the first grinding mill bar 1026A' of the first grinding body 1022' can be positioned opposite (i.e. facing) to at least a portion of the first grinding mill bar 1036A' of the second grinding body 1032'; at least a portion of the second grinding mill bar 1026B' can be positioned opposite (i.e. facing) to at least a portion of the second grinding mill bar 1036B'; at least a portion of the third grinding mill bar 1026C can be positioned opposite (i.e. facing) to at least a portion of the third grinding mill bar 1036C; and at least a portion of the fourth grinding mill bar 1026D can be positioned opposite (i.e. facing) to at least a portion of the fourth grinding mill bar 1036D.

[0111] When wood pulp containing wood fibers is supplied to the frame 66 of the refiner 10, such as Figure 1 As shown and as described above, axial force or pressure can be applied to one or both of the grinding members 20, 30, the adjustment of which is limited by the size of the gap between the first and second grinding members 20, 30. The first and third grinding bars 1026A' / 1036A' and 1026C / 1036C can be adapted to grind wood fibers in pulp, while the second and fourth grinding bars 1026B' / 1036B' and 1026D / 1036D can be adapted to break down or separate fiber bundles. Due to the first and third heights H of the first and third grinding bars 1026A' / 1036A' and 1026C / 1036C... 1000' and H 3000 The corresponding second and fourth heights H of the second and fourth grinding mill bars 1026B' / 1036B' and 1026D / 1036D are greater than those of the second and fourth grinding mill bars. 2000' and H 4000 Therefore, when the fibers pass through a portion of the grinding space defined at least partially by the first and third grinding mill grooves 1028A' / 1038A' and 1028C / 1038C (e.g., the first and second grinding zones, as described above), the wood fibers are subjected to high-intensity shear and compressive forces. The first and third grinding mill bars 1026A' / 1036A' and 1026C / 1036C interact with each other to grind a large number of wood fibers in the wood pulp. When the fibers enter a portion of the grinding space defined at least partially by the second and fourth grinding mill grooves 1028B' / 1038B' and 1028D / 1038D (e.g., the first and second disintegration zones, as described above), the intensity of the forces applied to the fibers decreases with decreasing height, which is believed to break up or separate the multiple bundles of wood fibers formed during grinding without further grinding or with only minimal grinding of the fibers.

[0112] In this example, the gap between the opposite portions of the second grinding mill bars 1026B' and 1036B' and between the opposite portions of the fourth grinding mill bars 1026D and 1036D can be from about 0.9 mm to about 20.0 mm (±0.05 mm). This range includes all values ​​and subranges within it, including, for example, 0.9, 1.0, 1.5, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5, 5.0, 5.5, 6.0, 6.5, 7.0, 7.5, 8.0, 8.5, 9.0, 9.5, 10.0, 10.5, 11.0, 11.5, 12.0, 12.5, 13.0, 13.5, 14.0, 14.5, 15.0, 15.5, 16.0, 16.5, 17.0, 17.5, 18.0, 18.5, 19.0, 19.5, and 20.0 mm. In an example where one or more of the second and fourth grinding mill bars 1026B' / 1036B' and 1026D / 1036D are substantially continuously inclined downward along at least a portion, the gap may be in the radially outward direction along at least a portion of the second grinding mill bars 1026B', 1036B', i.e., at a second radially inward position from the second grinding mill bars 1026B', 1036B' (e.g., P). 2000' Extending to the second radially outward position P 3000' The gap may increase in the direction of the fourth grinding mill bars 1026D, 1036D, and / or the gap may be increased along at least a portion of the fourth grinding mill bars 1026D, 1036D in the radially outward direction, i.e., at the fourth radially inward position from the fourth grinding mill bars 1026D, 1036D (e.g., P). 4000 Extending to the fourth radially outward position P 5000 The gap can be increased along the direction of the second and / or fourth mill bars 1026B' / 1036B' and 1026D / 1036D, essentially the entire longitudinal length L. 1000' and / or L 2000 Increase. In order to stop the fine grinding of fibers and begin the disintegration, it is believed that the second (minimum) height H of the second fine grinding mill bars 1026B' and 1036B' is increased. 2000' The fourth (minimum) height H of the fourth fine grinding mill bars 1026D and 1036D 4000 The first height H of the first grinding mill bars 1026A' and 1036A' should be compared respectively. 1000' The third height H of the third grinding mill bars 1026C and 1036C 3000 The smallest is at least about 0.35 mm (±0.05 mm).

[0113] In other examples, Figure 19B One of the fine grinding bodies 1022' and 1032' shown can be used with a conventional fine grinding body (not shown; see Figure 8(132) Pairing, the conventional grinding body includes a grinding bar having a uniform height along substantially its entire longitudinal length. For example, the first grinding member 20 may include the first grinding body 1022', while the second grinding member 30 may include a conventional grinding body. The grinding members 20, 30 may be arranged such that they face each other, wherein at least a portion of the first, second, third, and fourth grinding bars 1026A', 1026B', 1026C, 1026D is positioned opposite (i.e. facing) to at least a portion of the conventional grinding bar to define a gap between the opposing portions (see 132). Figure 8 and 9 As described herein, pulp is supplied to the wood pulp, and axial force or pressure can be applied to one or both of the grinding members 20, 30 to adjust the size of the gap, wherein the first and third grinding bars 1026A', 1026C are adapted to grind the wood fibers in the pulp, and the second and fourth grinding bars 1026B', 1026D are adapted to break down or separate fiber bundles. In this example, the gap between the opposite portions of the conventional grinding bars and the second and fourth grinding bars 1026B', 1026D can be from about 0.9 mm to about 10.0 mm (±0.05 mm). This range includes all values ​​and sub-ranges therein, including, for example, 0.9, 1.0, 1.5, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5, 5.0, 5.5, 6.0, 6.5, 7.0, 7.5, 8.5, 9.0, 9.5, and 10.0 mm. In embodiments in which the second and / or fourth grinding mill bars 1026B', 1026D are inclined, as described herein, the gap may increase in a radially outward direction along at least a portion of the grinding mill bars 1026B', 1026D, and may extend along substantially the entire longitudinal length L of the second and / or fourth grinding mill bars 1026B', 1026D. 1000' L 2000 Increase. In this example, the second (minimum) height H of the second grinding mill bar 1026B' / 1036B' is believed to be... 2000' The fourth (minimum) height H of the fourth fine grinding mill bar 1026D / 1036D 4000 The first height H should be compared with the first grinding mill bar 1026A' / 1036A' respectively. 1000' The third height H of the third grinding mill bars 1026C and 1036C 3000 The diameter should be at least about 0.7 mm (±0.05 mm) to stop the fine grinding of the fibers and begin to loosen them.

[0114] In both examples, it is believed that the gap between opposing portions of the finishing mill bars should be less than about 0.9 mm (±0.05 mm) for finishing (e.g., between opposing portions of the first and third finishing mill bars 1026A', 1036A' and 1026C, 1036C, or between the conventional finishing mill bars and opposing portions of the first and third finishing mill bars 1026A' / 1036A' and 1026C / 1036C). In some cases, the gap in the finishing zone(s) may be less than about 0.7 mm (±0.05 mm). In some specific cases, the gap may be from about 0.1 mm to about 0.5 mm (±0.05 mm). This range includes all values ​​in between and sub-ranges, including, for example, 0.1, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, and 0.5 mm. It is also believed that the gap should be from about 0.9 mm to about 2.0 mm (±0.05 mm) to allow for shaving (e.g., between opposite portions of the second and fourth grinding mill bars 1026B', 1036B' and 1026D, 1036D, or between opposite portions of the conventional grinding mill bars and the second and fourth grinding mill bars 1026B' / 1036B' and 1026D / 1036D). This range includes all values ​​and sub-ranges therein, including, for example, 0.9, 1.0, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, and 2.0 mm. As described in this article, a gap greater than approximately 2.0 mm can be used to address the issue of reducing the height H of the corresponding grinding mill bars 1026A', 1036A', 1026B', 1036B', 1026C, 1036C, 1026D, and 1036D. 1000' H 2000 H 3000 H 4000 Wear. The position of the grinding body can be adjusted as described herein to maintain the clearance at a desired value when wear begins on the grinding surface. In particular, embodiments in which the second and / or fourth grinding bars 1026B' / 1036B' and 1026D / 1036D are substantially continuously inclined downward along at least a portion of the grinding bars 1026B' / 1036B' and 1026D / 1036D are considered to allow the transition between the grinding zone and the slag zone along the longitudinal length L of the second and / or fourth grinding bars 1026B' / 1036B' and 1026D / 1036D. 1000' L 2000 The radial outward movement allows for the maintenance of a gap of approximately 0.9 mm to approximately 2.0 mm for scavenging throughout the entire service life of the polished component.

[0115] Figure 13 and 14These are plan views of portions of the first grinding surface 224 of the first grinding body 222 and the second grinding surface 234 of the second grinding body 232, respectively, according to another embodiment of this disclosure. (See reference...) Figure 1 , 13 And 14, the first and second grinding bodies 222, 232 can be grinding components, for example, parts of grinding components 20, 30, as described herein, for use in a pulp grinding mill, for example Figure 1 The disc grinding mill 10 shown in the diagram. Each of the grinding members 20 and 30, which respectively include first and second grinding bodies 222 and 232, can be associated with a main support frame including a fixed support frame 66 and a movable support frame 68 fixed to a first housing section 12. One grinding member, such as the first grinding member 20 including the first grinding body 222, can be fixed to the support frame 66 of the grinding mill 10 to define a non-rotating stator member. Another grinding member, such as the second grinding member 30 including the second grinding body 232, can be fixed to a support member 70 that rotates with a shaft 72 and defines a rotor associated with the main support frame, such that rotation of the rotor causes movement of the second grinding member 30 relative to the first grinding member 20.

[0116] like Figure 13 As shown, the first fine grinding body 222 includes multiple segments (not individually labeled; see [link]). Figure 2 and 3 The segments may be bolted together or otherwise attached to form a disc-shaped grinding body 222 including a radially outer edge 227. The first grinding surface 224 includes a plurality of elongated first grinding rods 226 separated from each other by first grinding grooves 228. The first grinding rods 226 extend radially outward from a radially inner position 223 toward the radially outer edge 227 of the first grinding body 222. The first grinding rods 226 may be inclined at various angles, such as... Figure 13 As shown, each segment of the grinding body 222 may include one or more segments (not labeled) of the grinding bar 226 inclined in different directions. The first grinding body 222 also includes one or more annular rows or rings of teeth 400 located between the first grinding bar 226 and the radial outer edge 227 of the first grinding body 222. Although not shown in Figure 13 As shown, but it should be understood, other sections (not marked) of the first grinding body 222 will similarly include the grinding bar 226, the grinding groove 228, and the teeth 400.

[0117] like Figure 14 As shown, the second grinding body 232 includes multiple segments (not individually labeled; see [link]). Figure 2 and 3The segments may be bolted together or otherwise attached to form a disc-shaped grinding body 232 including a radially outer edge 237. The second grinding surface 234 includes a plurality of elongated second grinding rods 236 separated from each other by second grinding grooves 238. The second grinding rods 236 extend radially outward from a radially inner position 233 toward the radially outer edge 237 of the second grinding body 232. The second grinding rods 236 may be inclined at various angles, such as... Figure 14 As shown, each segment of the grinding body 232 may include one or more segments (not labeled) of the grinding bar 236 inclined in different directions. The second grinding body 232 also includes one or more annular rows or rings of teeth 400 located between the radial outer edges 237 of the second grinding bar 236 and the second grinding body 232. Although not shown in Figure 14 As shown, but it should be understood, other sections (not labeled) of the second grinding body 232 will similarly include the grinding mill bar 236, the grinding mill groove 238, and the teeth 400. Furthermore, although not discussed in detail herein, Figure 1 The structures of the corresponding polishing surfaces 44 and 54 of the third and fourth polishing bodies 42 and 52 may include structures substantially similar to the corresponding polishing bodies 224 and 234 of the first and second polishing bodies 222 and 232, as described herein.

[0118] Figure 15 and 16 They are Figure 13 and 14 Detailed view of a portion of the first and second finely ground surfaces 224, 234. Figure 17 It can be located in Figure 13 and 15 The first grinding mill bar 226 and tooth 400B on the first grinding body 222 and can be located Figure 14 and 16 A partial cross-sectional view of the second grinding mill bar 236 and teeth 400A, 400C on the second grinding body 232, wherein the first grinding body 222 is spaced apart from the second grinding body 232 and positioned adjacent to and opposite to it to define a grinding space 260 therebetween. (Reference) Figure 15-17 The first grinding surface 224 includes a first grinding bar 226 separated from each other by a first grinding groove 228, and the second grinding surface 234 includes a second grinding bar 236 separated from each other by a second grinding groove 238. As described herein, one or both of the first and second grinding surfaces 224, 234 may include baffles 229, 239 disposed in at least a portion of the first and second grinding grooves 228, 238. Each of the first and second grinding bars 226, 236 is located radially inwardly at position P on the respective first and second grinding surfaces 224, 234. 100 Extending to the first radially outward position P200 In some examples, the radially inward position P 100 This can include a location at or near the corresponding radially inner position 223, 233 (see...) Figure 13 and 14 The first and second grinding mill bars 226 and 236 may each include a width W of approximately 2.0 mm to approximately 8.0 mm extending between the side edges of the respective grinding mill bars 226 and 236. 226 W 236 This range includes all values ​​and subranges within it, including, for example, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5, 5.0, 5.5, 6.0, 6.5, 7.0, 7.5, and 8.0 mm.

[0119] The first fine grinding surface 224 includes the radial outer edge RO located on the first fine grinding bar 226. 226 The first tooth 400B is located between the radial outer edge 227 of the first fine grinding body 222 and the first tooth 400B. The first tooth 400B extends to a third radially outward position on the first fine grinding surface 224, for example, P. 400 The third radially outward position P 400 The first radial outward position P of the first fine grinding mill bar 226 200 Closer to the outermost portion of the first grinding body 222, such as the radial outer edge 227. The second grinding surface 234 includes the radial outer edge RO located at the second grinding bar 236. 236 The second teeth 400A and 400C are located between the radial outer edge 237 of the second grinding body 232. The second teeth 400A and 400C extend to a second or fourth radially outward position on the second grinding surface 234, for example, P. 300 or P 500 The second and fourth radially outward positions P 300 P 500 The first radial outward position P of the second fine grinding mill bar 236 200 Closer to the outermost part of the second polishing body 232, for example, the radial outer edge 237.

[0120] Continue to refer to Figure 15-17 The teeth 400A-400C can be arranged in a concentric ring and can project substantially perpendicularly to each other from the respective polishing surfaces 224, 234. The ring including the first tooth 400B passes through the first substantially planar region 282 and the radial outer edge RO of the first polishing bar 226. 226 The ring, including the second tooth 400A, is spaced apart and separated from the radial outer edge 227 of the second grinding bar 236 by the second basic plane region 284. 236They are spaced apart, and separated from the ring including the second tooth 400C by the second basic plane region 288. Figure 15-17 In the illustrated embodiment, the first grinding surface 224 of the first grinding body 222 includes a concentric row / ring of first teeth 400B, and the second grinding surface 234 of the second grinding body 232 includes two concentric rows / rings of second teeth 400A, 400C, wherein the first and second teeth 400A-400C are arranged on the respective grinding surfaces 224, 234 such that the first teeth 400B meshes with the second teeth 400A, 400C. In other embodiments (not shown), the first grinding surface 224 may include two or more concentric rings of teeth, and the second grinding surface 234 may include a concentric row of teeth or three or more concentric rings of teeth. In all embodiments, one of the grinding bodies will include one fewer toothed ring than the other grinding body, and the teeth are arranged on each grinding body such that the teeth from one grinding body mesh with the teeth of the other grinding body, as is known in the art.

[0121] It should be understood that teeth 400A-400C can include any suitable shape and / or size known in the art. For example... Figure 17 As shown with respect to tooth 400A, in some examples, each of the first and second teeth 400A-400C may include a generally pyramidal or trapezoidal shape, having a base 402, a radially inward surface 404, a radially outward surface 406, a side (not separately labeled) slightly angled inward toward the central axis (not labeled) of tooth 400A, and a generally planar outer surface 408. The radially inward and outward surfaces 404, 406 of each tooth 400A-400C may be inclined from the base 402 toward their respective outer surfaces 408. The outer surface 408 of each tooth 400A-400C may be substantially parallel to the plane of the corresponding substantially planar regions 282, 284, 288 opposite to tooth 400A-400C. In other examples (not shown), each of the first and second teeth 400A-400C may include a shape of a basically triangular, rectangular, or any other suitable geometry. Figure 15-17 As shown, the base 402 of teeth 400A-400C may include a radial dimension larger than the circumferential dimension, but in other embodiments (not shown), the base 402 may include a radial dimension smaller than the circumferential dimension. In some cases, at least a portion of the base 402 of teeth 400A-400C may include a longitudinal length (not marked) of at least 0.6 cm, i.e., in the radial direction, and in some specific cases, the longitudinal length may include between 0.6 cm and 2 cm. In other cases, the circumferential width (not marked) of at least a portion of the base 402 of teeth 400A-400C may be substantially equal to the combined width of a grinding mill bar 226, 236 (e.g., W). 226W 236 ) and the width W of an adjacent slot 228, 238 G Width W G The thickness can be from about 2.0 mm to about 6.0 mm. This range includes all values ​​and sub-ranges therein, including, for example, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5, 5.0, 5.5, and 6.0 mm. For example, the base 402 of tooth 400A-400C may include at least about 10.0 mm (±0.5 mm) in the circumferential direction. In other cases, the base 402 of tooth 400A-400C may include from about 10.0 mm to about 20.0 mm (±0.5 mm) in the circumferential direction. Furthermore, one or more radially inward and outward surfaces 404, 406 or one or more side surfaces of tooth 400A-400C may include one or more radially extending protrusions that enable the interaction between tooth 400A-400C and wood fibers to separate the wood fiber bundles. The 400A-400C gears may have a structure similar to that shown in U.S. Patent No. 8,342,437B2, the disclosure of which is incorporated herein by reference.

[0122] like Figure 17 As shown, the first grinding mill bar 226 includes F from the bottom of the adjacent first grinding mill trough 228. 100 The first height H extending upwards 100 The second grinding mill bar 236 includes F from the bottom of the adjacent second grinding mill trough 238. 200 The second height H extending upwards 200 In some examples, the first and second heights H of the first and second grinding mill bars 226, 236 are... 100 H 200 They can be substantially equal to each other and can range from about 4.0 mm to about 10.0 mm (±0.5 mm). This range includes all values ​​and sub-ranges therebetween, including, for example, 4.0, 4.5, 5.0, 5.5, 6.0, 6.5, 7.0, 7.5, 8.0, 8.5, 9.0, 9.5, and 10.0 mm. The first and second grinding bodies 222, 232 are defined by the outer surface S of the first grinding bar 226. 226 The outer surface S of the second fine grinding mill bar 236 236 The first gap G between 100 Separated. Second gap G 200 Defined between the generally planar outer surface 408 of teeth 400A-400C and a corresponding one of the generally planar regions 282, 284, 288 opposite to teeth 400A-400C, wherein G 200 It can be greater than G 100In some examples, the height (unmarked) of the teeth 400A-400C extending upward from the adjacent, corresponding first or second grinding mill slots 228, 238 can be from about 8.0 mm to about 10.0 mm. This range includes all values ​​and sub-ranges in between, including, for example, 8.0, 8.5, 9.0, 9.5, and 10.0 mm. Figure 17 As shown, teeth 400A-400C mesh with each other such that a portion of one or both of the radially inward or outward surfaces 404, 406 of each tooth 400A-400C are in the axial direction, for example, in Figure 1 In the direction of the middle arrow A, it overlaps with a portion of the radially inward or outward surfaces 404, 406 of adjacent teeth 400A-400C. The overlapping portion of teeth(one or more) of 400A-400C may be defined by a third gap G between the respective radially inward or outward surfaces 404, 406 of teeth 400A-400C. 300 Spacing out. In some examples, G 300 It can be basically equal to G 200 In other examples, G 300 It can be less than or greater than G 200 .

[0123] refer to Figure 1 and 17 When the wood pulp is supplied to the frame of the refiner 10 (e.g., inlet 16), the wood fibers enter at least a portion of the refiner space 260 defined by the first and second refiner troughs 228, 238, for example, from about a first radially inward position P. 100 To approximately the first radially outward position P 200 The first and second grinding bars 226, 236 interact with each other to grind a large number of wood fibers in the wood pulp, as described herein. It is believed that the first gap G... 100 The gap should be less than about 0.9 mm (±0.05 mm) and preferably from about 0.2 mm to about 0.9 mm (±0.05 mm) for fine grinding. This range includes all values ​​and sub-ranges therebetween, including, for example, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, and 0.9 mm. In some examples, the first gap G... 100 The thickness can be from about 0.1 mm to about 0.5 mm (±0.05 mm). This range includes all values ​​and sub-ranges therebetween, including, for example, 0.1, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, and 0.5 mm. The finely ground wood fibers then enter a portion of a fine-grinding space 260, at least partially defined by corresponding first and second basic planar regions 282, 284, 286, 288, for example, from about a first radially outward position P.200 Approximately the fourth radially outward position P 500 It is believed that the second and third gaps G 200 and G 300 The fiber diameter should be from about 0.9 mm to about 1.5 mm (±0.05 mm) to allow for disintegration. This range includes all values ​​and sub-ranges within this range, including, for example, 0.9, 0.95, 1.0, 1.05, 1.1, 1.15, 1.2, 1.25, 1.3, 1.35, 1.4, 1.45, and 1.5 mm. As described herein, the 400A-400C teeth are suitable for breaking down or separating multiple bundles of wood fibers in wood pulp. 200 Greater than G 100 This causes the grinding process to stop and the material to loosen at a first position P, approximately in the first radial outward direction. 200 Start here.

[0124] refer to Figure 1 and 15 -17, the fine grinding surfaces 224 and 234 of the fine grinding bodies 222 and 232, especially the outer surfaces S of the first and second fine grinding bars 226 and 236. 226 S 236 The outer surface 408 of the teeth 400A-400C can wear and degrade over time. To compensate for this wear, the spacing between the first and second grinding members 20 and 30, which respectively include the first and second grinding bodies 222 and 232, can be readjusted as described herein, such that the first gap G 100 Maintain a basically constant level. This adjustment of the first and second grinding bodies 222, 232 can result in a second gap G. 200 The wear is reduced because the grinding mill bars 226 and 236 perform a more intense grinding function and generally wear faster than the teeth 400A-400C. This wear difference can be taken into account in the selection of the teeth 400A-400C (e.g., the type of metal used for the teeth 400A-400C, the second clearance G). 200 The initial size, the shape of the teeth 400A-400C, etc., ensure that sufficient second clearance G can be maintained. 200 To ensure that grinding stops and loosening begins when wood fibers enter at least a portion of the grinding space 260 defined by the corresponding first and second basic planar regions 282, 284, 286, 288. When the grinding bodies 222, 232 are new, the third gap G... 300 It can be substantially equal to or greater than the second gap G. 200 As the finely ground surfaces 224 and 234 wear down and the finely ground components 20 and 30 move closer together, the third gap G... 300 It can be reduced up to the third gap G 300 Smaller than the second gap G 200 .

[0125] In all the embodiments described herein, Figure 1 The fine grinding mill 10 can be connected to a controller (not shown), which is controlled by a fiber analyzer (e.g., The MAP pulp analyzer (Valmet Corp.) receives data on one or more fiber properties measured at one or more locations downstream of the refiner 10, such as the number and size of fiber bundles (also known as “wide blocks”), fibrillation, Canadian Standard Freeness, fiber length, fiber width, kinks, crimp, coarseness, fineness number, etc. Based on this data, a controller can control the operation of the refiner 10 as part of a feedback loop. For example, the controller can adjust the spacing between one or more pairs of refiner members 20, 30, 40, 50 to maintain one or more fiber properties within a predetermined target range. In some examples, the controller is believed to also increase or decrease the rotational speed of one or more rotating rotor members of the refiner 10 (e.g., second and third refiner members 30, 40) based on this data. In other examples, the controller can, for example, change the refiner gaps G1, G... 100 and the gaps G2, G3, G4, G5, G6, G 200 G 300 The size control of the mill 10 is used to produce a predetermined number (e.g., 1,000 ppm) of finely ground cork pulp having fiber bundles smaller than a specific size (e.g., about 150-2,000 micrometers wide and 0.3-40.0 mm long).

[0126] In other examples, the grinding components 20, 30, 40, and 50 according to this disclosure can be installed in one or more of a plurality of grinding mills arranged in series, wherein each grinding mill can be substantially similar to Figure 1 The fine grinding mill 10. The controller can control the operation of one or more of the multiple fine grinding mills to maintain one or more fiber properties within a predetermined target range. In some specific examples, the fine grinding components 20, 30, 40, 50 according to this disclosure may be installed only in the last fine grinding mill of the series, and in other examples, the fine grinding components 20, 30, 40, 50 according to this disclosure may be installed in two or more fine grinding mills.

[0127] Figure 18 This is a flowchart illustrating an exemplary method for processing wood fibers. Although referenced... Figure 1The method pertains to the components of the grinding mill 10, but it should be understood that the method is not limited to this structure. The method can begin at step 500, providing a grinding mill 10 comprising at least a first pair of grinding members 20 and 30, 40 and 50. The at least one pair of grinding members may include a first grinding member 20 having a first grinding body 22 including a first grinding surface 24 and a second grinding member 30 having a second grinding body 32 including a second grinding surface 34. The first grinding surface 24 may include a first grinding bar 26A separated by a first grinding mill groove 28A and a second grinding bar 26B separated by a second grinding mill groove 28B, wherein the first grinding bar 26A has a first maximum height H1 extending upward from the bottom F1 of an adjacent first grinding mill groove 28A, and the second grinding bar 26B has a second maximum height H2 extending upward from the bottom F2 of an adjacent second grinding mill groove 28B. The second grinding surface 34 may include a second grinding bar 36 separated by a second member grinding mill groove 38. The first grinding member 20 may be spaced apart from the second grinding member 30 to define a grinding space 60 therebetween. At least a portion of the second grinding member 36 may be positioned opposite the second grinding member 26B of the first grinding member 20, such that gaps G2, G3, G4, G5, and G6 are defined between a portion of the second grinding member 36 and the second grinding member 26B.

[0128] The method may continue to rotate at least one of the first polishing member 20 or the second polishing member 30 in step 510, such that the first and second polishing members 20, 30 move relative to each other, and in step 520, pulp comprising wood pulp and wood fibers is supplied to the polishing mill 10, such that the pulp passes through the polishing space 60. In step 530, axial pressure may be supplied to at least one of the first polishing member 20 or the second polishing member 30 when the pulp is supplied, such that the gaps G2, G3, G4, G5, G6 between a portion of the second member polishing bar 36 and the second polishing bar 26B are about 0.9 mm to about 1.5 mm, as described in detail herein, wherein at least a portion of the wood fiber bundles passing through the gaps G2, G3, G4, G5, G6 are separated, after which the method may be terminated.

[0129] Figure 20 This is a flowchart illustrating another exemplary method for processing wood fibers. Although referenced... Figure 1 The method describes a grinding mill 10, but it should be understood that the method is not limited to this structure. For example, the grinding mill may include a conical grinding mill. The method may begin at step 600, providing a grinding mill 10 including at least a first pair of grinding members 20 and 30, 40 and 50. The at least one pair of grinding members may include a first grinding member 20 having a first grinding body including a first grinding surface. The first grinding surface may include a first grinding bar separated from a first grinding mill groove, for example... Figure 6A , 6B The grinding mill bars 26A, 26A', 1026A, and 1026A' in 19A and 19B, and the second grinding mill bar separated from the second grinding mill tank, for example Figure 6A , 6B The grinding bars 26B, 26B', 1026B, and 1026B' in 19A and 19B, wherein the first grinding bar has a first height extending upward from the bottom of an adjacent first grinding groove, and the second grinding bar has a second height extending upward from the bottom of an adjacent second grinding groove. At least one pair of grinding members may further include a second grinding member 30 having a second grinding body including a second grinding surface. The second grinding surface may include a second grinding bar separated from the second grinding groove, for example... Figure 6A , 6B The grinding bars 36, 36', 1036, and 1036' in 19A and 19B. The first grinding member 20 may be spaced apart from the second grinding member 30 to define a grinding space 60 therebetween. At least a portion of the second member grinding bar may be positioned opposite the second grinding bar of the first grinding member to define a gap between a portion of the second member grinding bar and the second grinding bar.

[0130] The method may continue to rotate at least one of the first polishing member 20 or the second polishing member 30 in step 610, such that the first and second polishing members 20, 30 move relative to each other, and in step 620, a pulp comprising wood fibers is supplied to the polishing mill 10, such that the pulp passes through the polishing space 60. In step 630, axial pressure may be supplied to at least one of the first polishing member 20 or the second polishing member 30 when the pulp is supplied, wherein at least a portion of the wood fiber bundle passing through the gap is separated, after which the method may terminate. The gap defined between a portion of the second polishing member bar and the second polishing member bar may increase along at least a portion of the second polishing member bar in a direction extending from a first radially inward position toward a first radially outward position on the first polishing surface.

[0131] Although specific embodiments of the invention have been shown and described, it should be understood that various changes and modifications can be made without departing from the spirit and scope of the invention. Therefore, it is intended that all such changes and modifications within the scope of the invention be covered in the appended claims.

Claims

1. A grinding component for a pulp refiner, the grinding component comprising: A fine grinding body including a finely ground surface, the finely ground surface including: A first grinding bar separated from the first grinding mill tank and extending from a first radially inward position to a first radially outward position on the grinding surface; and A second grinding bar, separated from the second grinding mill groove and extending from a second radially inward position to a second radially outward position on the grinding surface, wherein the second radially outward position is closer to the outermost part of the grinding body than the first radially outward position, wherein: The first grinding mill bar has a first height extending upward from the bottom of the adjacent first grinding mill trough; The second grinding mill bar has a second height extending upward from the bottom of an adjacent second grinding mill trough, wherein the second height is the minimum height of the second grinding mill bar and is spaced apart from a second radially inward position, and the second height is at least 0.35 mm smaller than the first height; and The first grinding bar is suitable for grinding wood fibers, and the second grinding bar is suitable for breaking up fiber bundles. The second grinding mill bar has a maximum height, which is adjacent to the first radially outward position and is the same as the first height of the first grinding mill bar.

2. The grinding component according to claim 1, wherein the minimum height of the second grinding bar is adjacent to the second radially outward position.

3. The grinding component according to claim 1, wherein the first height is constant along the longitudinal length of the first grinding bar.

4. The precision-ground component according to claim 1, wherein the first height is 4.0 mm to 10.0 mm.

5. The precision-ground component according to claim 4, wherein the second height is 0.35 mm to 7.0 mm smaller than the first height.

6. The precision-ground component according to claim 4, wherein the second height is 0.7 mm to 7.0 mm smaller than the first height.

7. The grinding component according to claim 1, wherein the second grinding bar is integral with the first grinding bar, such that the second grinding bar extends from the first radially outward position to the second radially outward position.

8. The grinding component according to claim 7, wherein each of the second grinding bars is continuously inclined downward along at least a portion of each second grinding bar extending between the first radially outward position and the second radially outward position.

9. The grinding component according to claim 1, wherein at least a portion of the first grinding mill trough is provided with a baffle.

10. The precision-ground component according to claim 1, further comprising: The third grinding mill bar separated from the third grinding mill tank, each of the third grinding mill bars extending to a third radially outward position on the grinding surface; as well as The fourth grinding mill bar, separated from the fourth grinding mill tank, each of the fourth grinding mill bars extends to a fourth radially outward position on the grinding surface, the fourth radially outward position being closer to the outermost part of the grinding body than the third radially outward position. The third grinding mill bar has a third height extending upward from the bottom of an adjacent third grinding mill trough, and the fourth grinding mill bar has a fourth height extending upward from the bottom of an adjacent fourth grinding mill trough. The fourth height is the minimum height of the fourth grinding mill bar and is adjacent to the fourth radially outward position. The fourth height is at least 0.35 mm smaller than the third height. The third grinding bar is adapted to grind wood fibers, and the fourth grinding bar is adapted to break up fiber bundles.

11. The grinding component according to claim 10, wherein the third grinding bar is integral with the second grinding bar, such that the third grinding bar extends from the second radially outward position to the third radially outward position, and the fourth grinding bar is integral with the third grinding bar, such that the fourth grinding bar extends from the third radially outward position to the fourth radially outward position.

12. The grinding component of claim 10, wherein the third height of the third grinding bar includes a third maximum height, and the fourth grinding bar includes a fourth maximum height extending upward from the bottom of an adjacent fourth grinding groove, the radially outer portion of each of the third grinding bars including a descending step from the third maximum height to the fourth maximum height, wherein the fourth maximum height is at least 1.5 mm smaller than the third maximum height.

13. A pulp refiner, comprising: frame; At least the first pair of precision-ground components, which include: A first fine-grinding component, the first fine-grinding component being associated with the frame and including a first fine-grinding body having a first fine-grinding surface, the first fine-grinding surface including: A first grinding bar separated from the first grinding mill groove and extending from a first radially inward position on the grinding surface to a first radially outward position on the grinding surface; and A second grinding bar, separated from the second grinding mill groove and extending from a second radially inward position on the grinding surface to a second radially outward position on the grinding surface, wherein the second radially outward position is closer to the outermost part of the grinding body than the first radially outward position. The first grinding mill bar has a first height extending upward from the bottom of an adjacent first grinding mill trough, and the second grinding mill bar has a second height extending upward from the bottom of an adjacent second grinding mill trough. The second height is the minimum height of the second grinding mill bar and is spaced apart from the second radially inward position. The second height is at least 0.35 mm smaller than the first height. The second grinding mill bar has a maximum height, and the maximum height of the second grinding mill bar is adjacent to the first radially outward position and is the same as the first height of the first grinding mill bar. A second grinding component, associated with the frame and including a second grinding body having a second grinding surface, the second grinding surface including a second grinding bar separated by a second grinding groove, the first grinding component and the second grinding component being spaced apart to define a grinding space therebetween, wherein at least a portion of the second grinding bar is positioned opposite to the second grinding bar to define a gap between said portion of the second grinding bar and the second grinding bar; and A rotor, associated with and connected to the frame to one of the first or second grinding components, such that rotation of the rotor causes movement of one of the first or second grinding components relative to the other. When the pulp containing wood fibers is supplied to the frame, the pulp passes through the grinding space, causing a large number of wood fibers in the pulp to be ground and multiple bundles of wood fibers in the pulp to be separated.

14. The pulp refiner according to claim 13, wherein the minimum height of the second refiner bar is adjacent to the second radially outward position.

15. The pulp refiner of claim 13, wherein the first height is constant along the longitudinal length of the first refiner bar.

16. The pulp refiner according to claim 13, wherein the second height is at least 0.7 mm smaller than the first height.

17. The pulp refiner according to claim 13, wherein the second component refiner bar comprises: A first grinding bar element extending from a first radially inward position to a first radially outward position on the second grinding surface; as well as The second grinding bar element extends to a second radially outward position on the second grinding surface, closer to the outermost portion of the second grinding body than the first radially outward position. The first fine grinding mill bar element has a first bar height extending upward from the bottom of the adjacent groove, and the second fine grinding mill bar element has a second bar height extending upward from the bottom of the adjacent groove, the second bar height being the minimum height of the second fine grinding mill bar element and adjacent to the second radially outward position, wherein the second bar height is at least 0.35 mm smaller than the first bar height.

18. A method for processing wood fibers, comprising: A grinding mill is provided comprising at least a first pair of grinding components, the grinding components comprising: A first grinding component including a first grinding body, the first grinding body including a first grinding surface, the first grinding surface including: a first grinding bar separated from a first grinding mill trough and having a first height extending upward from the bottom of an adjacent first grinding mill trough; and a second grinding bar separated from a second grinding mill trough and having a second height extending upward from the bottom of an adjacent second grinding mill trough; and A second grinding component including a second grinding body, the second grinding body including a second grinding surface, the second grinding surface including a second grinding bar separated by a second grinding bar groove, wherein the first grinding component and the second grinding component are spaced apart to define a grinding space therebetween, and at least a portion of the second grinding bar is positioned opposite to the second grinding bar to define a gap between the portion of the second grinding bar and the second grinding bar; Rotate at least one of the first grinding member or the second grinding member such that the first and second grinding members move relative to each other; The wood pulp, comprising wood fibers, is supplied to the finishing mill, allowing the pulp to pass through the finishing space; and An axial pressure is applied to at least one of the first grinding member or the second grinding member when the slurry is supplied, wherein the gap increases along at least a portion of the second grinding bar in a direction extending from a first radially inward position toward a first radially outward position on the first grinding surface. At least a portion of the wood fiber bundle passing through the gap is separated; The second grinding mill bar has a maximum height, which is adjacent to the first radially outward position and is the same as the first height of the first grinding mill bar.

19. The method of claim 18, wherein the second height is the minimum height of the second grinding bar and is spaced apart from the second radially inward position, and the second height is at least 0.35 mm smaller than the first height.

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