WO2023099600A1 - Outil de broyage pour un raffineur destiné à réduire en pâte une charge contenant de la lignocellulose, et raffineur comprenant un tel outil de broyage - Google Patents

Outil de broyage pour un raffineur destiné à réduire en pâte une charge contenant de la lignocellulose, et raffineur comprenant un tel outil de broyage Download PDF

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Publication number
WO2023099600A1
WO2023099600A1 PCT/EP2022/083916 EP2022083916W WO2023099600A1 WO 2023099600 A1 WO2023099600 A1 WO 2023099600A1 EP 2022083916 W EP2022083916 W EP 2022083916W WO 2023099600 A1 WO2023099600 A1 WO 2023099600A1
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WO
WIPO (PCT)
Prior art keywords
grinding
area
grinding tool
radially
tool according
Prior art date
Application number
PCT/EP2022/083916
Other languages
German (de)
English (en)
Inventor
Helmut Roll
Christopher Kaub
Original Assignee
Siempelkamp Maschinen- Und Anlagenbau Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from DE102021133774.7A external-priority patent/DE102021133774A1/de
Application filed by Siempelkamp Maschinen- Und Anlagenbau Gmbh filed Critical Siempelkamp Maschinen- Und Anlagenbau Gmbh
Publication of WO2023099600A1 publication Critical patent/WO2023099600A1/fr

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
    • D21D1/00—Methods of beating or refining; Beaters of the Hollander type
    • D21D1/20—Methods of refining
    • D21D1/30—Disc mills
    • D21D1/306—Discs

Definitions

  • the invention relates to a grinding tool for a refiner for the digestion of lignocellulose-containing feed material according to the preamble of claim 1 and to a refiner equipped with such a grinding tool according to claim 20.
  • lignocellulose-containing materials such as wood chips as a starting material for the production of wood-based materials such as medium-density fiberboard (MDF) or for the production of paper and cardboard is well known.
  • lignocellulose-containing feed material is hydrothermally processed under pressure and broken up in the grinding gap between grinding tools of a refiner that rotate relative to one another.
  • the fibers obtained in this way are pressed into wood fiber boards with the addition of a binding agent or are used with or without binding agents in the production process for paper manufacture.
  • a refiner suitable for fiber production is described, for example, in EP 1 088 932 B1.
  • the refiner has a rotor rotating about an axis within a housing and having first grinding tools arranged concentrically about the axis, which are opposite second grinding tools which are stationary at an axial distance to form a grinding gap.
  • the feed material is conveyed with the help of a screw conveyor into the central area of the rotor, where it is Distribution disc is deflected in the radial direction and accelerated towards the grinding gap.
  • the grinding tools On their mutually facing surfaces, the grinding tools have a specific pattern of ledges and grooves running between the ledges, which interact to break down the fibers when the feed material passes radially through the grinding gap.
  • the quality of the fibers obtained in this way has a direct effect on the quality of the products made from them, so that there is increased interest in high-quality and at the same time inexpensive fibers on the part of the wood-based materials and paper industry.
  • the object of the invention is to develop grinding tools for a refiner which are capable of obtaining high-quality fibers from feedstock of different origins.
  • the grinding tool designates an element which, in cooperation with other grinding tools, causes the feed material to be broken down
  • the front side designates the surfaces on the grinding tool which face the grinding gap or the further grinding tool
  • the rear side designates the opposite surfaces on the grinding tool which facing away from the milling gap or the further milling tool
  • the milling-active upper side of a milling tool the surfaces that define the milling gap during the rotation of the milling tools are designated, which corresponds to the front sides of the webs over the entire radial extent of the milling tool, and with the milling area having a plurality of Webs and intermediate grooves stocked part of a grinding tool is referred to, which is essentially responsible for the breakdown of the feed material, so without the break-up and conveying area.
  • the invention is based on the finding that conventional grinding tools are insufficient for breaking down the fibers of alternative starting materials containing lignocellulose, such as annual plants, so that the fibers obtained from them do not meet the quality requirements for the production of high-quality end products in terms of their nature and uniformity.
  • grinding tools according to the invention have a radially inner breaking-up and conveying area on their front side, which breaks up agglomerates in the feed material, so that a largely constant flow of material is produced distributed over the circumference, which is fed to the grinding area adjoining radially outwards. Due to the unusually high If the surface area of the grinding area is at least 70% based on the entire front side of the grinding tool, in particular at least 80%, a highly efficient fiber digestion is achieved, which is the reason why the fibers obtained in this way are also suitable as a starting material for the production of high-quality products.
  • the invention is characterized by an extraordinarily high level of economy compared to the prior art.
  • the grinding area is further subdivided into a radially inner coarse grinding area and, in contrast, a radially outer fine grinding area.
  • the fine grinding area is at least as large as the coarse grinding area, preferably at least twice as large and in particular at least three times as large.
  • the area of the fine grinding zone is 50% or more of the front of the grinding tool.
  • the area of the rough grinding portion is preferably 35% or less of the face of the grinding tool.
  • the bars and grooves are arranged at a greater distance from one another than in the fine grinding area, so that the feed material is pre-ground in this area before the fibers are broken down in the fine grinding area, where bars and grooves are closer together and have a higher density. In this way, the intensity of the fiber digestion increases gradually in the direction of flow of the feedstock without overstressing it.
  • the webs and grooves preferably have a decreasing height over their course from the inside to the outside. This is achieved, for example, by the front side of the base body of a grinding tool, on which the webs and grooves are arranged, being inclined relative to its planar rear side, as a result of which the thickness of the base body increases from the inside to the outside.
  • the slope can be uniform from the inner edge to the outer edge of the grinding tool or differ in the breaking up and conveying area, coarse grinding area and fine grinding area. In the case of the latter, the slope of one area is greater than the slope of another area adjoining to the outside, ie the slope of the individual areas decreases from the inside to the outside. Due to the decreasing height of webs and grooves, the material flow is compressed as it passes through the grinding gap, which further contributes to the intensification of fiber pulping.
  • the grinding elements in the form of webs form the active grinding upper side of a grinding tool with their front side facing the grinding gap.
  • temporary compression and relaxation states are generated, which cause the fiber to be broken up.
  • the grinding-active upper side of the grinding tool can also have an incline.
  • an incline of a radially inner part of the grinding-active upper side makes it easier to start up a refiner.
  • a radially outer part of the grinding-active upper side can be without an incline, i.e. run plane-parallel to the grinding gap or to the rear side of the base body, so that the fiber opening takes place there immediately when the refiner is started up.
  • the fine grinding area differs from the coarse grinding area primarily due to the higher density of grinding elements.
  • the invention prefers a ratio of the number of bars in the fine grinding area to the number of bars in the coarse grinding area of 3: 2 or more, preferably 2: 1 or 3: 1.
  • the lower grinding element density in the coarse grinding area promotes a trouble-free material flow, while the higher Grinding element density in the fine grinding area strengthens the fiber breakdown.
  • the density of the grinding elements on the front side of the grinding tool is also determined by the angular distance between two webs.
  • the angular spacing of the webs is a maximum of 1°, preferably a maximum of 0.8°.
  • an advantageous development of the invention provides for the webs or grooves in the individual areas to be positioned opposite a radial line on the axis of rotation of the refiner to be arranged at an angle a in such a way that the webs or grooves are inclined counter to the direction of rotation.
  • the angle a in the breaking up and conveying area is greater than in the coarse grinding area and/or the angle a in the coarse grinding area is greater than in the fine grinding area. This measure contributes to a stronger conveying effect in areas with a larger angle a; the conveying effect thus decreases from the inside to the outside.
  • the angle a in the coarse grinding range between 0° and 15°, in particular 10° and/or the angle a in the fine grinding range between 0° and 5°, in particular 2°.
  • the angle ⁇ is at least 30°, preferably at least 45°, in particular at least 55°.
  • one or more dams in the grooves between two webs is also advantageous to arrange one or more dams in the grooves between two webs as a flow obstacle for the flow of material.
  • the flow of material which occurs increasingly in the area of the bottom of the groove, is guided to the actively grinding upper side.
  • This movement of the crop flow can be supported by providing a slope on the inner side of the dam.
  • the feed material is broken up under the action of the webs and reaches the respective adjacent grooves radially outwards. There it encounters further dams and so on until the finished fibers emerge radially from the grinding gap as the end product.
  • dams of adjacent grooves are arranged with a radial offset from one another, which leads to a stepped flow path of the feed material from the inside to the outside over the grinding-active upper side of a grinding tool.
  • the flow path established in this way further increases the efficiency of fiber digestion.
  • a preferred embodiment of the invention provides for the dams to be arranged at an angle ß to the longitudinal axis of the webs or grooves, so that the webs of the grinding tools rotating relative to one another that pass one another produce a kind of self-cleaning effect. It proves to be particularly advantageous if the angle ⁇ is between 30° and 90°, in particular between 35° and 45°.
  • the angle ⁇ is between 30° and 90°, in particular between 35° and 45°.
  • FIG. 2a is a plan view of the grinding set on the rotor side of the refiner shown in FIG. 1 along line II-II there,
  • FIG. 2b shows a top view of the stator-side grinding set of the refiner shown in FIG. 1,
  • FIG. 3 shows a plan view of the front side of a segment-shaped grinding tool according to the invention
  • FIG. 5a shows a top view of the grinding tool shown in FIG.
  • 5b shows a plan view of the grinding tool shown in FIG. 3, indicating the pitch s of the front side of the base body
  • FIG. 6 shows a section of the top view shown in FIG. 3 on a larger scale
  • FIG. 7 shows a section through the section shown in FIG. 6 along line VII-VII there.
  • the refiner 1 has a pressure-resistant housing 3 surrounding a horizontal axis 2 and enclosing a grinding chamber 4 .
  • the front side 5 of the housing 3 has an opening which is concentric to the axis 2 and into which a shaft bearing 6 for receiving a rotor 7 which is driven in rotation about the axis 2 is inserted.
  • the rotor 7 includes a drive shaft 8 which is coaxial with the axis 2 and at the end of which, lying within the grinding chamber 4, a carrier disk 9 is arranged to rotate.
  • the opposite end of the drive shaft 8 located outside of the grinding chamber 4 is connected to a rotary drive (not shown).
  • Arrow 10 indicates the direction of rotation of the rotor 7 .
  • First grinding tools 11 on the rotor side are fastened to the inside of the carrier disk 9 facing the grinding chamber 4 and surround the axis 2 in the form of a circular ring, with their grinding-active upper side 35 (FIG. 4) facing away from the carrier disk 9 .
  • the first grinding tools 11 on the rotor side are axially opposite to the second grinding tools 13 on the stator side, while maintaining a grinding gap 12 , which in turn are rigidly fastened to a support ring 14 arranged stationary with respect to the housing 2 .
  • a second pre-grinding ring 17 rigidly fastened to the carrier ring 14 is in turn located axially opposite the first pre-grinding ring 15 at a clear distance, as a result of which a pre-grinding gap 26 is formed.
  • the first pre-grinding ring 15 and/or the second pre-grinding ring 17 can optionally be omitted.
  • a screw conveyor 19 passes through the housing 3 coaxially to the axis 2.
  • the screw conveyor 19 only a part of the screw casing 20 with the screw shaft 21 rotating therein and the screw helix 22 can be seen, which end axially opposite the distributor disk 16.
  • the distributor disk 16 is surrounded by the first pre-grinding ring 15 on the rotor side, from the planar annular surface of which, facing the grinding gap 12, first pre-grinding ribs 25 protrude.
  • the cross section and course of the first pre-grinding ribs 25 basically correspond to the distributor ribs 24 and represent their continuation in the area of the first pre-grinding ring 15.
  • the height of the first pre-grinding ribs 25 increases radially inwards radially outwards.
  • first pre-grinding ribs 25 is greater than the number of distribution ribs 24; for example, one or two first pre-grinding ribs 25' are arranged between two first pre-grinding ribs 25, each continuing a distributor rib 24.
  • the first grinding tools 11 which are formed by ring segments in the present case, can be seen over the outer circumference of the carrier disk 9 and adjoining the first pre-grinding ring 15 in the radial direction. Along the radially running segment sides 30, 31 (FIG. 3), the grinding tools 11 are joined together without a gap or with a narrow gap, so that in this way a circular course of the grinding-active upper side 35 (FIG. 4) results.
  • the more precise design of the grinding tools 11 is explained in more detail in FIGS.
  • the first grinding tools 11 can also consist of a one-piece circular ring or two circular ring halves.
  • the second grinding tools 13 shown in FIG. 2b are opposite the first grinding tools 11 at a small axial distance, as a result of which a grinding gap 12 surrounding the axis 2 is formed (FIG. 1).
  • the second grinding tools 13 can correspond to the first grinding tools 11 in terms of shape, size and arrangement, although this does not rule out a design that deviates therefrom.
  • the second grinding tools 13 enclose a second pre-grinding ring 17 on the stator side, the front side of which faces the pre-grinding gap 26 has a curved profile in cross-section and is connected to the inlet opening formed by the screw shell 20 with the radially inner edge of the second pre-grinding ring 17 (Fig. 1).
  • second pre-grinding ribs 27 are arranged with a constant axial height. In this way, the second pre-grinding ribs 27 follow the curvature of the front side of the second pre-grinding ring 17, which results in a correspondingly curved course of the pre-grinding gap 26 (FIG. 1).
  • the clear axial distance between the first pre-grinding ribs 25 and second pre-grinding ribs 27 and thus the width of the pre-grinding gap 26 is a maximum of 15 mm, preferably a maximum of 11 mm.
  • Each grinding tool 11, 13 has a plate-like shape (FIG. 4) with an outline in the shape of a segment of a ring. Relative to the circle center point of the ring segment, the grinding tool 11, 13 has a radially inner edge 28 with a radius and a radially outer edge 29 with a radius r a .
  • the inner edge 28 and the outer edge 29 are connected to one another via a radially running first side 30 and a radially running second side 31 (FIG. 3).
  • the first and second sides 30, 31 intersect at the center of the circle at an angle of 20°, so that in the present exemplary embodiment, eighteen grinding tools 11, 13 joined together on the sides 30, 31 form a closed circular ring (FIGS. 2a, 2b). More or fewer first and second grinding tools 11 , 13 can also be provided.
  • the grinding tool 11 , 13 has a solid, plate-shaped base body 32 , the flat rear side 33 of which is intended for contact and attachment to the carrier disk 9 .
  • a large number of grinding elements are arranged on the opposite front side 34 of the base body 32, which, depending on the type, shape, size, alignment, density, etc., achieve a specific effect when the feedstock is broken down.
  • the grinding elements are essentially formed by the webs 36', 36", 36"', which form the grinding-active upper side 35 and, with the grooves 37", 37" and dams 38", 38"", break up the feed material cause.
  • the grinding area 40 is defined by the two radii r a and n.
  • the grinding area 40 is in turn subdivided into an inner coarse grinding area 41 located between the radii r 2 and r 2 and an outer fine grinding area 42 extending between the radii r a and r 2 .
  • the breaking up and conveying area 39 of a grinding tool 11, 13 is characterized by the approximately central arrangement of a web 36', the width of which decreases in the circumferential direction from the inside to the outside. A number of webs 36' are thus distributed uniformly over the entire circumference. In the area of the inner edge 28, the width of a web 36' corresponds approximately to that of a pre-grinding rib 25, 27 and in the transition to the grinding area 40 approximately to that of a web 36 there.
  • the longitudinal axis of the web 36' encloses an angle ⁇ with a radial R the one in the breaking up and conveying area
  • the breaking up and conveying area 39 is preferably between 40° and 70° and is 50° in the present exemplary embodiment.
  • the surface area of the breaking up and conveying area 39 is at most 15% and in the present exemplary embodiment approximately 10%.
  • the area of the breaking up and conveying area 39 is at most 20% of the area of the grinding area.
  • agglomerates in the feed material are broken up and the grinding area is evenly charged
  • the coarse grinding area 41 of a grinding tool 11, 13, which adjoins outwards in the radial direction, has a large number of webs 36", which extend in a straight line from the inside outwards at a clear circumferential distance and parallel to one another.
  • Two adjacent webs 36" each form a groove 37 between them "From. Webs 36" and grooves 37" enclose the angle a with a radial R, which is between 0° and 20° in the coarse grinding area 41 and is 10° in the present case.
  • the width of the webs 36" perpendicular to their longitudinal axis is smaller than the corresponding width of the grooves 37".
  • the ratio of web width to groove width is at most 0.8, preferably at most 0.7. In the present exemplary embodiment, the web width is 5 mm and the groove width is 7 mm.
  • Two dams 38" are arranged in the grooves 37", which connect two adjacent webs 36", with the radially inner dam 38" rising in the axial direction to approximately half the height of the webs 36" and the radially outer dam 38" rising above the full height of the webs 36".
  • the dams 38" On the side facing the inner edge 28, the dams 38" each have a bevel 43" which ends approximately halfway up the web.
  • the two dams 38" share the same groove 37" with a radial Offset to the two dams 38" of an adjacent groove 37" arranged.
  • the intersection angle a of the webs 36" with a radial R is greater than in the rest of the coarse grinding area 41 and is, for example, 20° to 30°, in particular 25°.
  • the surface area of the coarse grinding area is 41 a maximum of 35% and in the present exemplary embodiment 30%, based on the grinding area 40 the surface area of the coarse grinding area 41 is a maximum of 40%, in particular 35%.
  • the coarse grinding area 41 is adjoined radially outward by the fine grinding area 42, which is the same size or larger than the coarse grinding area 41, for example one and a half, twice or three times as large.
  • the fine grinding area 42 preferably embodies at least 60% of the grinding area 40 or at least 50% of the front side 35 of the grinding tool 11, 13.
  • the webs 36"' are narrower with a width of 3 mm, which means that the webs 36 '" permitted.
  • a further web 36'''' is arranged, the radially inner end face of which is inclined and in this way forms a bevel 46.
  • the angle a is the angle a, with which the webs 36''" each intersect a radial R, in a range between 0° and 5°.
  • the angle a there is approximately 2°. Due to the straight and approximately radial course of the webs 36"' with a constant web cross-section, the clear distance between two grooves 37"' increases with increasing distance from the inner edge 28. Since the grooves 36"" of the fine grinding area 42 are formed by adjacent webs 36"". are, the width of the grooves 37"" corresponds to the clearance between the webs, so the grooves 37"" widen over their course from radially inside to outside. In the present exemplary embodiment, the webs have a width of 3 mm and the clear distance between two adjacent webs 36''" is 3 mm at the radially inner end of the web and 5 mm at the radially outer end of the web.
  • dams 38"" which are at a mutual radial distance of 50 mm or less, preferably 40 mm or less can be arranged.
  • the dams 38"" completely fill the free cross-section of the grooves 37"", ie the height of the dams 38"" in the axial direction corresponds to the height of the webs 36"".
  • the side of the dams 38''' facing the inner edge 28 is designed as a bevel 43''' in the area between the front side 34 of the base body 32, which forms the bottom of the groove, up to half the height of a web 36''.
  • dams 43'" are arranged at a clear distance from one another in a groove 37'", the dams 43'" of a laterally adjacent groove 37'" in turn having a radial offset which is preferably approximately half the distance between two dams 43'" of a groove 37'" corresponds.
  • the dams 38"" form an angle ⁇ with the longitudinal axis of a web 36"" which preferably assumes a value of 90° or less.
  • the angle ⁇ is between 90° and 40° and, as in the present case, is 45°. This optimizes the material flow through the grinding gap and, in particular, ensures that the feed material does not accumulate in certain zones over a longer period of time.
  • the height of the webs 36', 36", 36"” or grooves 38', 38", 38"” in the axial direction results from a comparison of the profile of the grinding-active upper side 35 of the grinding tool 11, which is designated by 44 in FIG. 13 with the one marked 45 and the reason of the grooves 37', 37", 37"' forming the front side 34 of the base body 32 in the area between the inner edge 28 and the outer edge 29.
  • the arrows indicate the gradient s of the courses 44, 45, which can be seen That the front 34 of the base body 32 increases relative to the back 33 of the base body 32 from the inner edge 28 to the outer edge 29, so the thickness of the base body 32 increases steadily from the inside to the outside.
  • the gradient s 1 ; s 2 in a radially inner area of the front side 34 of the base body 32 is greater than the slope s 2 , s 3 in a contrast radially outer area.
  • the gradient Sj in the breaking up and conveying area 39 is 10% to 20%, in particular 14% to 16%
  • the gradient s 2 in the coarse grinding area 41 is 5% to 10%, in particular 7% to 8%
  • the gradient s 3 in the fine grinding area 42 0% to 5%, in particular 1% to 3%.
  • the profile 44 of the grinding-active upper side 35 of the grinding tools 11, 13 is characterized in that in a region between the radius rt3 and the radius there is a gradient s0 , which is between 1% and 5%, in particular between 2%. and 3%.
  • This area extends at least over the breaking up and conveying area 39 and coarse grinding area 41, preferably over the breaking up and conveying area 39, coarse grinding area 41 and part of the fine grinding area 42.

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  • Polishing Bodies And Polishing Tools (AREA)

Abstract

L'invention concerne un outil de broyage (11) pour un raffineur (1) pour la réduction en pâte d'une charge contenant de la lignocellulose en coopération avec d'autres outils de broyage (13) situés en face des outils de broyage (11) et formant une fente de broyage (12). Le contour de l'outil de broyage (11) correspond à la forme d'un anneau circulaire ou d'un segment d'anneau circulaire avec un bord intérieur (28) et un bord extérieur (29) par rapport au centre de l'anneau circulaire ou du segment d'anneau circulaire. L'outil de broyage (11) comporte également un corps de base en forme de plaque (32), dont la face arrière (33) est destinée à être fixée au raffineur (1), et sur la face avant (34) duquel sont disposés des éléments de broyage sous forme de bandes (36', 36'', 36'''), qui forment une face supérieure (35) active en matière de broyage. Afin de pouvoir produire des fibres de haute qualité à partir de matières premières d'origines différentes, il est proposé selon l'invention que la face avant de l'outil de broyage (11) soit divisée, de l'intérieur vers l'extérieur, en une zone combinée de broyage et de transport (39) et une zone de broyage (40), la zone de broyage (40) s'étendant sur au moins 70 % de la face avant de l'outil de broyage (11). L'invention concerne en outre un raffineur (1) étant équipé d'un tel outil de broyage (11).
PCT/EP2022/083916 2021-11-30 2022-11-30 Outil de broyage pour un raffineur destiné à réduire en pâte une charge contenant de la lignocellulose, et raffineur comprenant un tel outil de broyage WO2023099600A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE102021131496.8 2021-11-30
DE102021131496 2021-11-30
DE102021133774.7 2021-12-18
DE102021133774.7A DE102021133774A1 (de) 2021-11-30 2021-12-18 Mahlwerkzeug für einen Refiner zum Aufschluss von lignozellulosehaltigem Aufgabegut sowie Refiner mit einem solchen Mahlwerkzeug

Publications (1)

Publication Number Publication Date
WO2023099600A1 true WO2023099600A1 (fr) 2023-06-08

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PCT/EP2022/083916 WO2023099600A1 (fr) 2021-11-30 2022-11-30 Outil de broyage pour un raffineur destiné à réduire en pâte une charge contenant de la lignocellulose, et raffineur comprenant un tel outil de broyage

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3149792A (en) * 1964-09-22 Refiner plates
SU1390281A1 (ru) * 1986-05-30 1988-04-23 Пермский филиал Всесоюзного научно-исследовательского института целлюлозно-бумажной промышленности Гарнитура дисковой мельницы дл размола волокнистого материала
EP0611599A1 (fr) * 1993-01-14 1994-08-24 Sunds Defibrator Industries Aktiebolag Segment de raffinage
EP1088932B1 (fr) 1999-09-28 2004-06-16 J&L Fiber Services, Inc. Disque de raffineur et procédé
WO2020163459A1 (fr) * 2019-02-06 2020-08-13 Andritz Inc. Segments de plaque de raffineur comportant des rainures d'alimentation

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3149792A (en) * 1964-09-22 Refiner plates
SU1390281A1 (ru) * 1986-05-30 1988-04-23 Пермский филиал Всесоюзного научно-исследовательского института целлюлозно-бумажной промышленности Гарнитура дисковой мельницы дл размола волокнистого материала
EP0611599A1 (fr) * 1993-01-14 1994-08-24 Sunds Defibrator Industries Aktiebolag Segment de raffinage
EP1088932B1 (fr) 1999-09-28 2004-06-16 J&L Fiber Services, Inc. Disque de raffineur et procédé
WO2020163459A1 (fr) * 2019-02-06 2020-08-13 Andritz Inc. Segments de plaque de raffineur comportant des rainures d'alimentation

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