WO2022069234A1 - Strömungsoptimierte randbehandlung - Google Patents
Strömungsoptimierte randbehandlung Download PDFInfo
- Publication number
- WO2022069234A1 WO2022069234A1 PCT/EP2021/075418 EP2021075418W WO2022069234A1 WO 2022069234 A1 WO2022069234 A1 WO 2022069234A1 EP 2021075418 W EP2021075418 W EP 2021075418W WO 2022069234 A1 WO2022069234 A1 WO 2022069234A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- flow
- flow body
- dividing device
- web
- fibrous
- Prior art date
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
- D21F1/56—Deckle frame arrangements
-
- 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
- D21F1/02—Head boxes of Fourdrinier machines
Definitions
- the invention relates to a flow body for a format limitation unit of a fourdrinier wire machine for producing a fibrous web, in particular a paper or cardboard web, the flow body comprising a flow-dividing device which is suitable for separating an edge strip from a fibrous suspension jet, and a format limitation unit with such a flow body and its use in a fourdrinier paper machine
- Such a format limitation unit is known, for example, from publication DE202011103266U1 and publication US4456502.
- the edge strip is separated by a metal sheet or a blade, see for example publication DE 20 2011 103 266 U1, paragraph 0012 to paragraph 0017, which dips into the fibrous suspension jet at an advantageous angle.
- the blade also shows a very direct stall, which results in an unsteady flow.
- individual fibers can stick to the blade and agglomerate into so-called lumps, which can also cause quality problems when they hit the web. Such chunks can also lead to tears in the web in the following process steps of papermaking.
- the blade is typically characterized by a sharp edge, wedge-shaped shape and a low wall thickness of less than 4 mm.
- Another problem of the turbulent edge treatment can also be drops that can arise from the fibrous suspension jet and spread for example, agglomerate on the surface of the format limitation unit or the flow body and can also get onto the web as clumps.
- the object of the invention is to avoid these described disadvantages and to enable a uniform flow of the fibrous suspension jet and a uniform separation of the edge strip from the fibrous suspension jet.
- the aim of the invention is in particular to reduce waves in the fibrous suspension jet and on the web. These waves can arise if the flow does not remain parallel to the direction of web travel, but parts of the flow run counter to the direction of web travel.
- a flow body for a format limitation unit of a fourdrinier wire machine for producing a fibrous web, in particular a paper or board web is advantageous, the flow body comprising a flow-dividing device which is suitable for separating an edge strip from the fibrous suspension jet, in that the flow-dividing device has a rounded edge in the area of the flow division with a Radius of curvature greater than 2 mm, preferably greater than 3 mm to 18 mm.
- the rounding of the flow-dividing device has shown in tests that a more uniform flow can be achieved in the area of the web edge.
- fewer fibers from the fibrous suspension jet get stuck on the rounding and the The possibility of a clump formation is reduced.
- a flow body width of 4 mm to 36 mm has proven particularly effective.
- the flow body can be designed in such a way that the rounded edge of the flow-dividing device comprises a rounding with the rounding radius in a semicircular cross-section, or at least a rounding which in cross-section comprises a circle segment of greater than 90° to 180°.
- a rounding of the flow-dividing device has proven to be advantageous since an even flow along the surface is made possible. This applies in particular if the flow body is directly connected tangentially to the flow-dividing device and thus has a width of 5 mm to 15 mm. If the rounding only includes a segment of a circle of more than 90° to 180°, it is important that such a resulting edge on the segment of a circle is arranged on the side of the flow-dividing device that faces away from the center of the path when the flow body is installed as intended, because at this Edge can tear off the steady flow in an uncontrolled manner.
- the flow body is designed in such a way that the rounded edge of the flow-dividing device is rounded in cross-section in an elliptical or circular shape, the division axis of which comprises twice the length of the rounding radius.
- the presence of the rounding alone has a balancing function on the flow-dividing device. It is also particularly advantageous if the flow body directly follows the flow-dividing device with the same width. In a particularly preferred embodiment, the pitch axis of the rounding thus has a length of 4 to 36 mm. In a further advantageous embodiment of the invention, the flow body is designed in such a way that the flow body has a lower edge which is arranged at an angle a to the flow-dividing device, the angle a being in the range from 10° to 45°.
- the flow-dividing device follows a slightly concave or convex curve, the angle a then relates to the theoretical center line (not shown) of the concave or convex shape of the flow-dividing device.
- the flow body is designed such that the flow-dividing device is arranged above the fibrous material jet and thus has an angle ⁇ of 120° to 170° to the lower edge of the flow body.
- the flow body is designed in such a way that the flow body has a first side and a second side and the flow-dividing device is connected to a curved discharge element, which is designed to divert a wave following the flow division from the first side derive on the second side of the flow body.
- the fibrous suspension can flow over the flow at the flow-dividing device in the further course above the flow division or the fibrous suspension jet.
- This wave can be described with the deflection element described are derived to the sides facing away from the center of the web and are transported away from the web with the edge strips.
- the flow body is designed in such a way that the flow body has a collecting device which is arranged in the area above the flow-dividing device or the discharge element in such a way that drops that may arise from the fibrous suspension jet and the edge strip in the area of the flow division are collected be, wherein the catching device is geometrically shaped so that the collected drops can be directed away from the pulp suspension jet.
- the collecting device is advantageously designed in such a way that the collected droplets are guided by the flow speed, an air flow or gravity to the side of the flow-dividing device facing away from the web center and can be discharged there in the format limiting unit.
- a possible embodiment of the catching device is, for example, a protective plate that is arranged above the flow-dividing device in such a way that the drops can be guided away from the web.
- the flow body is designed such that the flow body has one or more rinsing devices which can discharge rinsing water on at least one side of the flow body through a supply line and corresponding outlet openings.
- the flushing device is suitable for reducing the buildup of fiber material or dirt on the side of the flow body and inside the format limiting unit.
- the transport of the edge trim can also be supported by an advantageous direction of flow of the flushing water.
- the rinsing water can consist of pure water, process water or water with the addition of cleaning agents, in particular surfactants.
- the flushing device can be designed as a pipeline with corresponding outlet openings or nozzles, or it can be integrated directly into the flow body through corresponding cavities and outlet openings, as shown for example in FIG. 3 and FIG. In addition, it is also possible to arrange the flushing device below the lower edge of the flow body in such a way that no dirt adheres to the flow body there either. For good integration of the flushing device, it can also be advantageous to produce the flow body in an additive process.
- the invention also advantageously includes a format limiting unit in a fourdrinier wire machine for producing a fibrous web, in particular a paper, cardboard or packaging paper web, comprising a flow body for immersion in a fibrous suspension jet, the flow body being designed according to one of the aspects of the invention.
- the format limitation can also be carried out advantageously in that the flow body can be easily replaced when worn, preferably by a screw connection to the format limitation unit and by appropriate form-fitting geometry, the flow of the fibrous suspension jet is suitable for guiding the flow of the fibrous stock suspension jet to the point of occurrence of the screen without disturbances, for example due to larger edges or gaps.
- the flow body can also be advantageous to manufacture the flow body from plastic or metal at low cost.
- the wear can occur in particular due to abrasive substances in the fibrous suspension jet and make it necessary to replace the flow body if it loses the advantageous flow properties.
- a format limiting unit in a fourdrinier machine for producing a fibrous web, in particular a paper, cardboard or packaging paper web, from at least one fibrous suspension, at least comprising an endless fourdrinier wire running in the circumferential direction, a headbox which, via a headbox nozzle, converts the fibrous stock suspension into a applies a fibrous suspension jet over the width of the fourdrinier wire to form a fibrous web, and two format limiting devices which are attached on two opposite sides parallel to the web center of the fourdrinier wire, the format limiting units being suitable for separating one edge strip each from the fibrous web in the area of the fibrous suspension jet and the edge of the fourdrinier wire, whereby the flow-dividing device of the flow body is arranged at an angle a′, in the range from 10° to 45°, in relation to the plane of the wire, or the xy axis.
- Another advantage is the use of a format limitation unit according to one aspect of the invention, wherein the format limitation unit can be adjusted mechanically and the setting is made in such a way that the flow-dividing device is defined in the range from 10° to 45° in relation to the plane of the fourdrinier wire (x-y axis). can be adjusted.
- the format limiting unit when using a format limiting unit, it is advantageous to design the format limiting unit to be pivotable.
- the ability to swing away is particularly important for screen changes, maintenance and cleaning work.
- a corresponding lever and an adjustment for example by means of locking screws, can also be provided for this.
- It can be pivoted parallel to the web, so that a distance of 10 cm, for example, between the format limitation unit and the paper web is possible.
- It is also possible to swivel the format limitation unit away from the track using a tilting axis, so that better accessibility is achieved.
- the format limitation unit can also be advantageous for the format limitation unit to be connected directly to a lateral boundary boundary, such as an edge boundary sign, for example, or to form a structural unit with it, which can be pivoted together, for example.
- the fibrous jet flow flows along the format limitation unit or the edge limitation, it can also be advantageous to attach further discharge elements to the format limitation unit or the subsequent edge limitation device in order to divert this flow away from the paper web.
- Figure 1 shows a schematic perspective partial representation of a first preferred embodiment of the format limiting unit 7 with the flow body 1 and the flow-dividing device 2.
- the fibrous suspension jet is represented by schematic flow lines 5, 5', with 5' representing the edge strip separated from the fibrous suspension jet.
- the fibrous suspension jet 5 occurs in the area of the jet impingement point 6 on the fourdrinier wire, not shown in detail, and the paper web is formed, with the web center and running direction being shown at 9 .
- a coordinate system with x, y and z axes is shown, with the web plane of the wire forming through the x and y axes.
- the region A shown schematically is shown in different embodiments in the following figures.
- the flow of the pulp suspension jet 5 takes place in the xz plane until it hits the Flow onto the wire, from then on the fibrous web is moved with the wire in the xy plane.
- FIG. 2 shows a schematic perspective partial representation of a further preferred embodiment of the flow body 1 and shows a possible detail A from the embodiment shown in FIG.
- the flow-dividing device 2 is shown and positively connects to a discharge element 3.
- a collecting device 4 is shown above the discharge element, which is suitable for collecting drops from the fibrous suspension jet 5 and from the area of the edge strip 5' and discharging them with the format limiting unit 7.
- the area marked B shows a sectional plane for the embodiments shown in cross section in FIG.
- Figure 3 shows a schematic cross section of three preferred embodiments for the flow body 1 and the flow-dividing device 2.
- the flow-dividing device 2 is shown with a semicircular cross-section 10, a cross-section of 90° to 180° 11 and an elliptical or circular-like cross-section 11.
- the embodiment with a cross section of 90° to 180° has an edge on the side facing away from the middle 9 of the track, which leads to a stall.
- the circular element of the flow-dividing device is positively connected to the flow body and, moreover, to the format limitation unit 7 .
- the embodiment with the elliptical or circular cross-section is also designed such that a form-fitting transition to the side of the flow body is provided, in particular on the side facing the center 9 of the web.
- All three preferred embodiments also show a schematic, optionally present flushing device 14 in various advantageous positions.
- This rinsing device has a supply line and outlet openings on at least one side of the flow body or below the lower edge of the flow body 15.
- the rinsing device can also be implemented in a separate pipeline (not shown) and has a coupling valve (not shown) that can be connected to a rinsing water supply.
- Figure 4 shows a schematic perspective partial representation of a further preferred embodiment of the format limiting unit 7 with the flow body 1 and the flow-dividing device 2.
- the fibrous suspension jet is represented by schematic flow lines 5, 5', with 5' representing the edge strip separated from the fibrous suspension jet.
- the fibrous suspension jet 5 occurs in the area of the jet impingement point 6 on the fourdrinier wire, not shown in detail, and the paper web is formed, with the web center and running direction being shown at 9 .
- a coordinate system with x, y and z axes is shown, with the plane of the paper web and the wire forming through the x and y axes.
- the flow is divided here only in reverse, which means that the flow-dividing device 2 is located above the fibrous suspension jet 5 in relation to the paper web.
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Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP21778387.7A EP4222309A1 (de) | 2020-10-02 | 2021-09-16 | Strömungsoptimierte randbehandlung |
US18/129,216 US20230235508A1 (en) | 2020-10-02 | 2023-03-31 | Flow-optimized edge treatment |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102020125806.2 | 2020-10-02 | ||
DE102020125806.2A DE102020125806A1 (de) | 2020-10-02 | 2020-10-02 | Strömungsoptimierte Randbehandlung |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US18/129,216 Continuation US20230235508A1 (en) | 2020-10-02 | 2023-03-31 | Flow-optimized edge treatment |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2022069234A1 true WO2022069234A1 (de) | 2022-04-07 |
Family
ID=77951675
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2021/075418 WO2022069234A1 (de) | 2020-10-02 | 2021-09-16 | Strömungsoptimierte randbehandlung |
Country Status (4)
Country | Link |
---|---|
US (1) | US20230235508A1 (de) |
EP (1) | EP4222309A1 (de) |
DE (1) | DE102020125806A1 (de) |
WO (1) | WO2022069234A1 (de) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3361620A (en) * | 1964-12-11 | 1968-01-02 | Allis Chalmers Mfg Co | Deckle assembly for a paper making machine |
US4456502A (en) | 1981-07-31 | 1984-06-26 | Beloit Corporation | Method for adjusting the format of continuous aqueous fibre suspension delivered by the head boxes of a paper manufacturing machine, and the device for carrying out said method |
DE202011103266U1 (de) | 2011-07-16 | 2011-08-29 | Voith Patent Gmbh | Blattbildungsvorrichtung |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3226388C2 (de) | 1982-07-15 | 1985-06-13 | Sulzer-Escher Wyss GmbH, 7980 Ravensburg | Vorrichtung zur Abnahme der Ränder der Stoffsuspension beim Austritt des Stoffes aus den Stoffauflauf einer Papiermaschine |
-
2020
- 2020-10-02 DE DE102020125806.2A patent/DE102020125806A1/de active Pending
-
2021
- 2021-09-16 EP EP21778387.7A patent/EP4222309A1/de active Pending
- 2021-09-16 WO PCT/EP2021/075418 patent/WO2022069234A1/de unknown
-
2023
- 2023-03-31 US US18/129,216 patent/US20230235508A1/en active Pending
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3361620A (en) * | 1964-12-11 | 1968-01-02 | Allis Chalmers Mfg Co | Deckle assembly for a paper making machine |
US4456502A (en) | 1981-07-31 | 1984-06-26 | Beloit Corporation | Method for adjusting the format of continuous aqueous fibre suspension delivered by the head boxes of a paper manufacturing machine, and the device for carrying out said method |
DE202011103266U1 (de) | 2011-07-16 | 2011-08-29 | Voith Patent Gmbh | Blattbildungsvorrichtung |
Also Published As
Publication number | Publication date |
---|---|
EP4222309A1 (de) | 2023-08-09 |
DE102020125806A1 (de) | 2022-04-07 |
US20230235508A1 (en) | 2023-07-27 |
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