EP4654865A1 - Entwaesserungselement zur entwaesserung einer faserstoffbahn - Google Patents
Entwaesserungselement zur entwaesserung einer faserstoffbahnInfo
- Publication number
- EP4654865A1 EP4654865A1 EP23809469.2A EP23809469A EP4654865A1 EP 4654865 A1 EP4654865 A1 EP 4654865A1 EP 23809469 A EP23809469 A EP 23809469A EP 4654865 A1 EP4654865 A1 EP 4654865A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- dewatering
- wear body
- covering
- drainage element
- designed
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F1/00—Wet end of machines for making continuous webs of paper
- D21F1/48—Suction apparatus
- D21F1/483—Drainage foils and bars
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
- B22F5/04—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of turbine blades
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
Definitions
- the invention relates to a dewatering element for dewatering a fibrous web guided on a covering over the dewatering element, comprising a wear body which forms a sliding surface, wherein the covering can be guided over the wear body in direct contact with the sliding surface in order to dewater the fibrous web.
- the invention further relates to a dewatering device for use in a machine for producing the fibrous web, in particular a paper or pulp web, comprising the dewatering element according to the invention.
- a fibrous suspension is formed and fed to the sheet forming unit of the machine via a headbox.
- the fibrous web is formed from the suspension by dewatering.
- the suspension is guided onto a fabric, which in turn is guided over the various dewatering elements, such as dewatering strips, or dewatering devices, such as a forming shoe or a dewatering table. This creates direct contact between the fabric and the dewatering element, with the dewatering element forming a sliding surface for the fabric.
- dewatering elements such as dewatering strips, or dewatering devices, such as a forming shoe or a dewatering table.
- the frictional resistance of the sliding surface should be minimal in order to achieve the lowest possible frictional power.
- the wear on the sliding surface of the drainage elements should be minimal in order to ensure the longest possible service life of the covering and the drainage elements.
- EP4101977 discloses a scraper bar. This is made of metal or plastic and is provided on the upper side facing the screen belt with a large number of wear elements made of a wear-resistant material, in particular surface-ground ceramic plates. The wear elements are mounted on a support bar and lined up in the direction of the longitudinal extension of the scraper bar.
- EP4101977 further states that scraper bars, which can be up to 12 m long, must be manufactured exactly to the respective width of the paper machine and therefore must be produced individually, with the disadvantage that this construction is expensive, involves long delivery times and production in stock is not possible.
- the aim of the invention is a dewatering element whose wear body can be easily produced, whereby the wear body can be easily adapted to the respective width of the paper machine and in particular can be easily made in one piece over the entire width of the dewatering element.
- a further aim of the invention is a dewatering element whereby the valuable materials contained in the wear body can be easily recycled after use and can be reused in particular in the manufacture of wear bodies for dewatering elements.
- the wear body is designed as a ceramic-reinforced polymer substrate, with ceramic particles incorporated into the polymer substrate.
- the wear body is thus designed as a polymer substrate, with ceramic particles incorporated into the polymer substrate, which effect the ceramic reinforcement of the polymer substrate.
- a covering guided over the wear body is in direct contact with the wear body via the sliding surface.
- the ceramic reinforcement of the polymer substrate i.e. the particles incorporated into the polymer substrate, effect the high resistance to abrasion.
- a higher ceramic proportion in the wear body allows an improvement in the abrasion resistance or wear resistance.
- the ceramic particles are made of a material with a crystalline or crystalline/amorphous structure or microstructure.
- the design of the wear body as a polymer substrate is advantageous in itself, since the polymer substrate gives the wear body improved strength, in particular impact resistance, and improved toughness, or reduced brittleness.
- the polymer substrate gives the wear body the advantageously low coefficient of friction and thus the low frictional resistance, whereby the polymer substrate fills the cavities between the ceramic particles and enables the formation of a substantially smooth sliding surface of the wear body.
- the object according to the invention thus has a synergistic effect.
- the wear body according to the invention advantageously allows repairs, in particular by mending local defects.
- Such local defects are formed, for example, as breakouts.
- the local defect is simply treated with the ceramic-reinforced polymer substrate or the breakout is closed.
- a simple design of the wear body is possible.
- there are no significant restrictions with regard to the achievable width of the drainage body which allows a one-piece design of the wear body or the drainage element.
- the labor-intensive construction of the wear body from a large number of ground ceramic plates, which is known from the prior art can be dispensed with.
- the solution according to the invention also advantageously allows the recycling of the wear body.
- the polymer substrate of the drainage element is advantageously designed as a duromer.
- Duromers are plastics that can no longer be deformed after they have hardened by heating or other measures. This is particularly advantageous for the application according to the invention, since considerable amounts of heat can be introduced into the wear body as a result of the frictional power transferred from the covering to the drainage element.
- the polymer substrate designed as a duromer thus allows for typical Operating temperatures or design temperatures of drainage elements ensure that dimensional stability and operational strength are maintained.
- duromers are characterized by high mechanical strength, although these strength properties are essentially not influenced by temperature.
- duromers allow very good integration of ceramic particles, since duromers have an advantageously high adhesive force and are therefore an optimal polymer substrate.
- the polymer substrate designed as a duromer gives the wear body an advantageously low coefficient of friction and therefore low frictional resistance.
- a particularly simple design of the wear body is possible, e.g. by producing the wear body using a casting process, in particular using a vacuum casting process. Casting can take place, for example, at room temperature.
- the wear body produced in this way has very smooth surfaces even after casting, which means that post-processing of the surfaces is not necessary or is only necessary to a small extent.
- Production using a casting process also allows for great flexibility in terms of the geometry of the wear body that can be realized. Curved geometries, such as the strips in forming shoes, can be easily realized. Local defects in the wear body can also be repaired very well using a casting process.
- the wear body of the drainage element is made from a ceramic-reinforced polymer resin, in particular epoxy resin, in particular using a casting process.
- the substrate is formed from the synthetic resin, with a vacuum casting process being particularly advantageous.
- the casting can be carried out at room temperature, for example.
- Synthetic resins are, for example, precursors, i.e. prepolymers, for the formation of duromers. These precursors are advantageously liquid or soluble and can be easily mixed with fillers, in particular ceramic particles. This makes it possible to form the wear body easily, in particular by shaping the wear body using a casting process, whereby the synthetic resin is cast together with the embedded ceramic particles.
- the prepolymers are typically polymerized and cross-linked with the help of hardeners and possibly catalysts.
- an epoxy resin system as a polymer resin is particularly advantageous, as this allows the ceramic particles to be incorporated in an advantageous manner.
- the epoxy resin system reacts to form a duromer after mixing with a hardener and, after curing, has advantageous mechanical properties and advantageous temperature resistance.
- a favorable embodiment of the invention is characterized in that the mass fraction of the ceramic particles in the ceramic-reinforced polymer substrate is 60% - 99%, in particular 70% - 98% and particularly advantageously 80% - 96%.
- a higher mass fraction of the ceramic particles is associated with a higher wear resistance of the wear body.
- a higher polymer substrate fraction is in turn advantageous with regard to the impact resistance or the toughness of the wear body.
- the mass fraction of the ceramic particles in the wear body is limited upwards in order to ensure a homogeneous integration of the ceramic particles in the polymer substrate.
- a further advantageous embodiment of the invention is characterized in that the incorporated ceramic particles are made of Si carbide, Si nitride, Al oxide, Zr oxide or zirconium dioxide-reinforced aluminum oxide. These specific ceramics are particularly favorable in terms of their wear resistance.
- all ceramic particles in a wear body consist of the same specific ceramic. It is also advantageous for ceramic particles made of different specific ceramics to be present in a wear body.
- An advantageous embodiment of the invention is characterized in that the ceramic particles have a diameter, in particular measured by laser diffraction according to ISO 13320:2020, the diameter of the ceramic particles is less than 1.5 mm and in particular less than 1 mm and the diameter of the ceramic particles is most often between 0.1 mm and 0.4 mm and in particular between 0.2 mm and 0.3 mm. Excessively large diameters of the ceramic particles should be avoided, since larger particles break off more easily from the polymer substrate or the sliding surface during operation.
- the ceramic particles are preferably polydisperse, with a mixture of ceramic particles with different diameters.
- Polydisperse ceramic particles can be embedded particularly well in the polymer substrate, with a high space filling through the ceramic particles in the polymer substrate is possible and a low mass fraction of the polymer substrate in the wear body allows a secure integration of the ceramic particles into the wear body.
- a further advantageous embodiment of the invention is characterized in that the dewatering element is designed for use in a machine for producing the fibrous web, in particular a paper or cellulose web.
- the dewatering element is preferably designed as a strip, in particular as a stripping strip, dewatering strip, forming strip, or as a covering, in particular as a screen table covering, former covering, suction strip covering, wet vacuum covering, separating vacuum covering, felt vacuum covering or as a perforated plate for dewatering.
- the dewatering element or the strip extends over the entire working width of the covering or the working width of the machine.
- the dewatering elements can also be arranged in the machine direction, i.e. in the direction of movement of the covering, in which case a plurality of dewatering elements are arranged transversely to the machine direction to form a dewatering device, in particular a forming shoe.
- the wear body is designed as a single piece, in particular over a working width of the covering.
- the working width of the machine essentially corresponds to the working width of the covering or the width of the fibrous web.
- a single piece design of the wear body over the entire working width of the covering is advantageous because the modular design of the wear body using ceramic plates known from the prior art is very complex and labor-intensive and can be omitted.
- This single piece production over the working width is made possible by the design of the wear body as a ceramic-reinforced polymer substrate, whereby the wear body can be manufactured as a single piece over the entire working width, in particular in a casting process.
- the wear body is divided into parts over a working width of the covering.
- the parts of the wear body are lined up.
- the division of the wear body or the drainage element allows for easier delivery of the drainage element from the production site to the place of use.
- the design of the wear body as a ceramic-reinforced polymer substrate makes it easy to divide the wear body into longer parts.
- the drainage element preferably comprises a wear body, whereby the wear body is divided over the working width of the covering into a maximum of 10 parts, more advantageously into a maximum of 8 parts and particularly advantageously into a maximum of 6 parts.
- the parts of the wear body are advantageously connected by gluing and/or by positive locking.
- the connection by positive locking can in particular take the form of interlocking parts of the wear body.
- the combination of gluing and positive locking allows a particularly resilient connection of the parts of the wear body.
- the wear body of the drainage element is also designed as a support bar for being accommodated in a frame.
- ceramic elements or plates are constructed to form a wear body, which is connected to a support bar.
- the drainage element designed in this conventional manner can be accommodated in a frame via the support bar. Due to the inventive design of the wear body as a ceramic-reinforced polymer substrate, the wear body can be manufactured very easily and, in particular, complex geometries, such as the design of the wear body as a support bar, can be realized easily and inexpensively. In particular, the wear body can be manufactured using a casting process, which means that there are hardly any restrictions with regard to the shape.
- the drainage element comprises, in addition to the wear body, a support strip, in particular made of fiber-reinforced plastic or polymer substrate.
- a support strip in particular made of fiber-reinforced plastic or polymer substrate.
- the formation of support strips made of fiber-reinforced plastic is advantageous.
- the support strip can also advantageously be made of the polymer substrate, whereby the incorporation of ceramic particles in the support strip can be dispensed with.
- the polymer substrate has good strength, in particular impact resistance, and good toughness, or reduced brittleness.
- Wear body and support strip can be connected by form and/or force locking. Force locking can be achieved, for example, by gluing, whereby a combination of form and force locking can be achieved. a particularly resilient connection.
- the wear body is applied to the support bar in a casting process - forming a positive and/or force-fit connection.
- the invention also relates to a dewatering device for dewatering a fibrous web in a machine for producing a paper or pulp web, wherein the dewatering device comprises at least one dewatering element according to the invention.
- the dewatering device can be designed as a forming shoe, screen table, suction box, in particular a wet suction box, separating suction box, felt suction device, flat suction device, etc.
- dewatering elements are typically designed in particular as strips transverse to the machine direction.
- a forming shoe is typically constructed from dewatering elements that are aligned in the machine direction, wherein a plurality of dewatering elements are then arranged transversely to the machine direction to form the dewatering device.
- Fig. 1 shows a machine for producing a paper or pulp web with dewatering devices and dewatering elements according to the state of the art.
- Fig. 2 shows a drainage device with drainage elements according to the prior art.
- Fig. 3 shows a drainage element according to the state of the art.
- Fig. 4 shows a drainage element according to the invention.
- Fig. 5 shows another drainage element according to the invention.
- Fig. 1 shows a machine 5 for producing a paper or pulp web with dewatering devices 9 and dewatering elements 1 according to the prior art, whereby a Fourdrinier or fourdrinier wire former is shown.
- a fibrous suspension is applied to a fabric 2 via a headbox 10 and for dewatering via various dewatering devices 9, e.g. the screen table, dewatering boxes with strip-shaped drainage elements and drainage boxes with covering-shaped drainage elements.
- the drainage of the fibrous web takes place through the covering 2, whereby the covering 2 is in direct contact with the drainage elements 1 and slides over the drainage elements 1 and wears them down.
- Fig. 2 shows a dewatering device 9 with dewatering elements 1 according to the prior art, wherein a dewatering box with strip-shaped dewatering elements 1 is shown.
- the fibrous web lying on the covering 2 is guided over the dewatering elements 1 and dewatered in the process.
- the individual dewatering element 1 is designed here as a strip or dewatering strip and comprises a wear body 3 which forms a sliding surface 4, wherein the covering 2 is guided in direct contact with the sliding surface 4 for dewatering the fibrous web.
- the wear bodies 3 are composed of sintered ceramic plates.
- the dewatering element 1 further comprises a support strip 8, wherein the dewatering element 1 is connected to a frame or the box via the support strip 8.
- the connection between the ceramic wear body 3 and the support strip 8 is made, for example, by gluing.
- Fig. 3 shows a drainage element 1 according to the state of the art.
- the illustration covers the entire working width 6 of the machine or the covering 2.
- the wear body 3 is designed as a sintered ceramic, with the wear body 3 being constructed in detail from individual ceramic plates 11, with the ceramic plates 11 being lined up and connected.
- Fig. 4 shows a drainage element 1 according to the invention, which is designed as a drainage strip.
- the wear body 3 is designed as a ceramic-reinforced polymer substrate, wherein ceramic particles are incorporated into the polymer substrate.
- the polymer substrate is designed as a duromer, wherein the wear body 3 is made from a ceramic-reinforced polymer resin, in particular epoxy resin, using a casting process.
- the mass fraction of the ceramic particles in the ceramic-reinforced polymer substrate is advantageously 80%-96%.
- the drainage element 1 comprises a support strip 8 for Connection of the drainage element 1 to a frame (not shown).
- the support bar 8 can be made of fiber-reinforced plastic, but in particular also of the polymer substrate.
- connection between the wear body 3 and the support bar 8 in the drainage element 1 shown is made by positive and non-positive locking, with the positive locking being provided by a dovetail connection.
- the wear body 3 is applied to the support bar 8 using the casting process, whereby the wear body 3 and the positive and non-positive connection with the support bar 8 are formed.
- the drainage element 1 shown and in particular the wear body 3 can be one-piece over the working width 6 of the covering or the machine or can be divided into parts.
- Fig. 5 shows a drainage element 1 according to the invention, which is also designed as a drainage strip.
- the drainage element 1 shown here differs from the embodiment shown in Fig. 4 in that the wear body 3 is also designed as a support strip 8 for receiving in a frame.
- the drainage element 1 comprising the wear body 3 and the support strip 8 can thus be produced in a single production step, e.g. by a casting process.
- the drainage element 1 shown is advantageously one-piece over the working width 6 of the covering 2 or the machine 5, or divided into parts.
- the dewatering element according to the invention in particular its wear body, can be produced simply and with little labor, whereby the wear body can be produced for the respective width of the paper machine and in particular can be produced in one piece over the entire width of the clothing or machine.
- the geometry of the wear body can be realized. Curved geometries can thus be easily realized, e.g. by means of a casting process.
- the invention is characterized by a synergistic effect, whereby a wear body designed as a ceramic-reinforced polymer substrate has an advantageously high resistance to abrasion and also has improved strength, in particular impact resistance, improved toughness or reduced brittleness, and a low coefficient of friction or low friction resistance.
- the valuable materials contained in the wear body ie the ceramic particles, can be recycled easily after use and without any adverse changes to the ceramic particles, whereby the ceramic particles can subsequently be used again in the manufacture of wear bodies for drainage elements.
Landscapes
- Paper (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ATA50040/2023A AT526435B1 (de) | 2023-01-26 | 2023-01-26 | Entwaesserungselement zur entwaesserung einer faserstoffbahn |
| PCT/EP2023/081609 WO2024156391A1 (de) | 2023-01-26 | 2023-11-13 | Entwaesserungselement zur entwaesserung einer faserstoffbahn |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4654865A1 true EP4654865A1 (de) | 2025-12-03 |
Family
ID=88874767
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP23809469.2A Pending EP4654865A1 (de) | 2023-01-26 | 2023-11-13 | Entwaesserungselement zur entwaesserung einer faserstoffbahn |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP4654865A1 (de) |
| CN (1) | CN120583899A (de) |
| AT (1) | AT526435B1 (de) |
| WO (1) | WO2024156391A1 (de) |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA1000684A (en) * | 1972-04-12 | 1976-11-30 | Union Carbide Corporation | Low-friction, wear-resistant material |
| IT983011B (it) * | 1972-04-12 | 1974-10-31 | Union Carbide Corp | Materiale composito resistente all usura di scarso attrito adat to per l impiego in macchinari per la fabbricazione della carta e relativo procedimento di produzione |
| FI55069C (fi) * | 1972-07-19 | 1979-05-10 | Int Paper Co | Laongstraeckt flexibel keramisk kropp |
| DE3307749A1 (de) * | 1982-03-05 | 1983-10-13 | Rolls-Royce Ltd., London | Bauteil mit einem kompositwerkstoff-ueberzug und verfahren zum aufbringen des ueberzugs |
| FI943777A7 (fi) * | 1994-08-17 | 1996-02-18 | Valmet Paper Machinery Inc | Paperikoneen vedenpoistoelin ja menetelmä sen valmistamiseksi |
| FI105351B (fi) * | 1999-02-15 | 2000-07-31 | Valmet Corp | Menetelmä kuluvan pinnan tiivistämiseksi |
| DE10057553A1 (de) * | 2000-11-21 | 2002-05-23 | Voith Paper Patent Gmbh | Verfahren und Anordnung zur Befestigung von mindestens einem mit einem Verschleißkörper versehenen Formkörper auf einem Trägerkörper |
| DE102012218961A1 (de) * | 2012-10-17 | 2014-04-30 | Sgl Carbon Se | Stationäres Entwässerungselement für eine Maschine zur Herstellung einer Faserstoffbahn und dazugehöriges Verfahren |
| DE102013216437A1 (de) * | 2013-08-20 | 2015-02-26 | Voith Patent Gmbh | Verwendung von Faser-Keramik-Verbunden in der Papiermaschine |
| DE102018123406B3 (de) * | 2018-09-24 | 2019-12-05 | Voith Patent Gmbh | Entwässerungsvorrichtung |
| AT524317B1 (de) | 2021-06-08 | 2022-05-15 | Bartelmuss Ing Klaus | Abstreifleiste und Bausatz zur Verwendung in einer Anlage zur Erzeugung einer Papierbahn |
-
2023
- 2023-01-26 AT ATA50040/2023A patent/AT526435B1/de active
- 2023-11-13 WO PCT/EP2023/081609 patent/WO2024156391A1/de not_active Ceased
- 2023-11-13 EP EP23809469.2A patent/EP4654865A1/de active Pending
- 2023-11-13 CN CN202380090896.4A patent/CN120583899A/zh active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| WO2024156391A1 (de) | 2024-08-02 |
| CN120583899A (zh) | 2025-09-02 |
| AT526435B1 (de) | 2024-03-15 |
| AT526435A4 (de) | 2024-03-15 |
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