EP4077804A1 - Vorrichtung und verfahren zum überführen einer faserstoffbahn - Google Patents
Vorrichtung und verfahren zum überführen einer faserstoffbahnInfo
- Publication number
- EP4077804A1 EP4077804A1 EP20819688.1A EP20819688A EP4077804A1 EP 4077804 A1 EP4077804 A1 EP 4077804A1 EP 20819688 A EP20819688 A EP 20819688A EP 4077804 A1 EP4077804 A1 EP 4077804A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- web
- stabilizing element
- roller
- fibrous web
- rotating roller
- 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.)
- Granted
Links
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
- D21G9/00—Other accessories for paper-making machines
- D21G9/0063—Devices for threading a web tail through a paper-making machine
Definitions
- the invention relates to a device for transferring a paper, cardboard, tissue or other fibrous web in a machine for producing and / or refining the same in a target area, with a separating device for separating the fibrous web into one lying on a first edge of the fibrous web Transfer strips and a residual web, the transfer strip and the residual web in front of the target area touching a rotating roller with their side opposite the upper side of the fibrous web and partially wrapping around it and being removed from the machine downwards and with a transfer device for transferring the transfer strip to a
- the following machine element of the target area is provided and the separating device for widening the threading strip is designed to be movable transversely to the direction of web travel.
- the invention also relates to a method for transferring a paper, cardboard, tissue or other fibrous web in a machine for producing and / or refining the same.
- Such devices are used, for example, in papermaking to feed the new beginning of the web to a target roll when a paper machine is started up or after the paper web is torn, which is designed as a drying cylinder or a web guide roll that deflects the paper web or on which the paper web is to be wound.
- Such transfers take place in sections in the paper machine.
- the cut, narrow transfer strip is transferred to the following section of the paper machine.
- the remaining web is discharged from the machine down into a pulper, broken up and recycled.
- the transfer strip is moved wide by the movement of the separating element transversely to the direction of travel of the web, the remaining web becomes narrower and its run becomes less stable.
- the remaining track can flutter, causing the remaining track to enter the target area in an uncontrolled manner can get, which can lead to tears.
- scraps of paper are deposited in the machine.
- the document EP 1903142 B1 describes a system for widening a fibrous web. Stabilization devices are disclosed here which act on the underside of the fibrous web. The stabilization devices are acted upon, for example, with negative pressure or generate a negative pressure in order to stabilize the remaining web.
- the known devices are complex to install and operate. To stabilize the fibrous web, energy is required to generate a vacuum. On the other hand, the negative pressure leads to friction between the fibrous web and stationary stabilization devices. This can lead to a build-up of dust.
- the object of the invention is therefore to simplify and improve the stabilization of the fibrous web during transfer.
- a device for transferring a paper, cardboard, tissue or other fibrous web in a machine for producing and / or refining the same in a target area, with a separating device for separating the fibrous web into one lying on a first edge of the fibrous web Transfer strips and a residual web, the transfer strip and the residual web in front of the target area touching a rotating roller with their side opposite the top side of the fibrous web and partially wrapping around it and being removed from the machine downwards and with a transfer device for transferring the threading strip to a following machine element of the target area is provided and wherein the separating device for widening the transfer strip is designed to be movable transversely to the direction of web travel.
- a stabilizing element can be positioned in the area of the remaining web opposite the top, the stabilizing element at least partially covering the remaining web and the remaining web between the rotating roller and the stabilization element is discharged downwards.
- the rotating roller can preferably be designed as a drying cylinder.
- the stabilizing element By arranging the stabilizing element opposite the top of the fibrous web, that is to say in the space between the fibrous web and the target area, the stabilizing element can be passive, that is to say without the use of a vacuum.
- the stabilizing element is designed so that it can be positioned in the paper machine. This offers the possibility that it is only positioned inside the paper machine for the transfer process and taken out of the paper machine again for production operation or brought into a parking position inside or outside the paper machine. In this case, no disruptive air currents can arise through the stabilizing element or intentional air currents can be disturbed. This is particularly true when the device is intended for a dryer section.
- the fibrous web is separated into a transfer strip and a residual web by the separating element.
- the transfer strip is narrower than the remaining web and is arranged on a first edge of the fibrous web.
- the first edge of the fibrous web is assigned to the driver's side of the device.
- the separating device is moved in the direction of the drive side of the device.
- the stabilizing element now prevents, in a simple manner, preferably in the area of the drive-side edge of the remaining web, a movement of the remaining web in the direction of the target area, for example a subsequent roller or a subsequent clothing.
- the two sides of a paper machine are usually referred to as the driver side and the drive side.
- the operator's side is the operating side for the operators of the paper machine.
- the threading strip is formed on the driver-side edge of the fibrous web in order to be able to control and influence the threading process.
- Drives and auxiliary units of the paper machine are arranged on the drive side and are therefore only accessible to a limited extent for the operating personnel.
- the distance between the stabilizing element and the rotating roller and / or the upper side of the remaining running web is less than 150 mm during the strip stabilization. This favors the stabilizing effect, especially of a narrow remaining web and avoids breaks.
- the stabilizing element is designed to be rotatable axially parallel to the rotating roller. This supports the removal of the remaining web from the paper machine down into a pulper.
- the direction of rotation of the stabilizing element is opposite to the direction of rotation of the rotating roller.
- the stabilizing element preferably has a rotary drive.
- the speed is preferably adjustable. This also supports the removal of the remaining web from the paper machine down into a pulper.
- the stabilizing element can be arranged on the edge of the fibrous web opposite the first edge, and preferably dimensioned so that there is a maximum overlap of the remaining web transversely to the web running direction of 20mm to 800mm, in particular from 20mm to 500mm, preferably from 150mm to 250mm.
- the first edge preferably corresponds to the driver-side edge of the fibrous web and consequently in this case the edge opposite the first edge corresponds to the drive-side edge of the fibrous web.
- the stabilizing element only partially covers the remaining web during the strip stabilization before the transfer strip is widened.
- the stabilization element presses the remaining web, preferably with an adjustable force, against the rotating roller during the strip stabilization. This favors the A stabilizing effect, especially in the case of a narrow remaining web and breaks, are avoided.
- the stabilizing element is mounted on a bracket in such a way that its position can be changed transversely to the web running direction and / or in the web running direction, preferably vertically. This is advantageous in order to be able to cover all web widths, web layers and cutting positions of the remaining web as far as possible.
- the stabilization element can be positioned manually or automatically for this purpose.
- the fibrous web is partially guided around the rotating roller, the fibrous web being arranged between a drying wire and the rotating roller.
- the dryer fabric presses the fibrous web against the surface of the rotating roller.
- the dryer fabric is then moved away from the rotating roller, creating a drainage line.
- the fibrous web continues to run together with the dryer fabric.
- the fibrous web and the dryer fabric separate.
- the fibrous web runs lying on the rotating roller to a scraper, which loosens the fibrous web so that it can get down into the pulper.
- the process of transferring the fibrous web into the target area then begins.
- the stabilizing element is positioned directly in front of a scraper following the rotating roller in the direction of rotation and preferably after the run-off line.
- a stabilization area is formed in which the movement of the remaining web is stabilized.
- the position of the stabilizing element can be specified by the vertical distance to an imaginary horizontal plane running through the center point of the rotating roller.
- the stabilizing element is arranged below the horizontal plane. This applies to a stabilizing element which is in contact with the remaining web and is also arranged at a distance from the remaining web. The distance from the horizontal plane to the upper edge of the stabilizing element is preferably measured.
- the rotating roller has a roller radius.
- the vertical distance can be in a range of less than or equal to 0.9 times the roller radius, preferably in a range of less than or equal to 0.83 times the roller radius, in particular in a range of less than or equal to 0.6 times the roller radius. This allows the size of the stabilization area to be optimized.
- the vertical distance is in a range greater than or equal to 0.4 times the roller radius, preferably in a range greater than or equal to 0.45 times the roller radius, in particular in a range greater than or equal to equal to 0.5 times the roller radius. This also allows the size of the stabilization area to be optimized.
- the stabilizing element can be designed as a roller, a guide roller. This enables a very simple and inexpensive solution.
- the guide roller serving as a stabilizing element can have an elastic roller jacket.
- the guide roller serving as a stabilizing element can have a diameter between 30 mm and 500 mm, preferably between 30 and 300 mm, in particular between 30 mm and 200 mm. It is advantageous if the guide roller serving as a stabilizing element comprises a material selected from the group consisting of aluminum, V2A steel, V4A steel, cast, plastic, titanium, brass, bronze.
- the guide roller serving as a stabilization element comprises a coating or a roller cover from the following group of materials: rubber, polyurethane, Teflon, CFRP.
- the roller cover can also be designed as a monofilament mesh.
- the guide roller serving as a stabilizing element can have multiple bearings.
- the stabilizing element can alternatively also be designed as a blower device. As a result, a fluid in the overlap area is blown onto the remaining web for stabilization.
- blowpipe arranged transversely to the running direction of the remaining web, which blows at least one fluid jet, for example an air jet, against the remaining web and thereby stabilizes the running of this remaining web.
- blowpipe arranged transversely to the running direction of the remaining web, which blows at least one fluid jet, for example an air jet, against the remaining web and with it a guide surface extending in the running direction of the remaining web, interacts with regard to stabilizing the running of the remaining web.
- fluid jet for example an air jet
- the stabilizing element is designed as a belt that is guided around two or three or more rollers.
- Method for transferring a paper, cardboard, tissue or other fibrous web (9) in a machine for the production and / or finishing of the same in a target area A separating device is provided for separating the fibrous web into a transfer strip lying on a first edge of the fibrous web and a residual web, the transfer strip and the residual web touching a rotating roller in front of the target area with their side opposite the upper side of the fibrous web and partially wrapping them around and off these are removed from the machine downwards and the transfer strip is transferred by a transfer device to a following machine element of the target area and wherein the separating device for widening the transfer strip is designed to be movable transversely to the web running direction.
- a stabilization element is positioned in the area of the remaining web opposite the top, the stabilizing element, the remaining web z at least partially covered and the remaining web between the rotating roller and the stabilizing element is removed downwards.
- the stabilizing element is preferably designed as a roller and is arranged on the edge of the fibrous web opposite the first edge.
- the stabilizing element is preferably dimensioned in such a way that an overlap of the remaining web transversely to the web running direction of 20 mm to 800mm, in particular from 20mm to 500mm, preferably from 150mm to 250mm is achieved.
- the invention also relates to the use of the device according to claims 1 to 11 for transferring a fibrous web in a machine for the production and / or finishing of the same in one
- the target area is the first or second drying cylinder of the first dryer group of a dryer section or a pre-dryer section or an after-dryer section.
- the invention also relates to the use of the device according to claims 1 to 11 for transferring a fibrous web in a machine for the production and / or finishing of the same in one
- Target area is a size press.
- Figure 1 is a schematic side view of the transition between the press and dryer section with a device according to the invention
- FIG. 2 shows a view of the rotating roller (4) against the production direction in a simplified representation
- FIG. 3a shows a detail from FIG. 1 with an alternative stabilizing element
- FIG. 3b shows a detail from FIG. 1 with a further, alternative stabilizing element
- the fibrous web 9 is transferred during normal operation from the forming wire 10 of a former to a water-absorbing dewatering belt 11 running endlessly above the fibrous web 9 of a subsequent press section for dewatering the fibrous web 9.
- the press section comprises one or mostly several press nips through which the fibrous web 9 is guided together with at least one dewatering belt 11, 12.
- the fibrous web 9 runs together with an upper 11 and a lower dewatering belt 12 through the single press nip formed by two press rolls 13, 14.
- the upper dewatering belt 11 is led away from the fibrous web 9 and the fibrous web 9 is transferred from the lower dewatering belt 12 to an air-permeable, endlessly rotating drying wire 15 of a subsequent drying group for drying the fibrous web 9.
- the takeover of the fibrous web 9 is supported by a guide roller 20 wrapped around by the dryer fabric 15 during the takeover and vacuumed.
- the fibrous web 9 is alternately guided by the drying wire 15 over heated drying cylinders 16 and suctioned guide rollers 17, the drying wire 15 pressing the fibrous web 9 against the hot outer surface of the drying cylinders 16. While the drying cylinder
- a doctor 8 is assigned to the first drying cylinder 16, which removes the fibrous web 9, residues thereof or other impurities from the jacket surface.
- the row of drying cylinders 16 lies above the row of guide rollers 17.
- the suctioned guide rollers 17, 20 have a perforated roll shell, the interior of which is connected to a vacuum source.
- a cutting device 2 is used to separate a transfer strip 3 from the fibrous web 9, which then has to be transferred to a downstream target area 1 of the machine.
- the separating device 2 is arranged here in the former, the transfer strip 3 being separated out on the guide side 22 of the machine at the edge of the fibrous web 9.
- the remaining web 20 of the fibrous web 9 is fed from the forming wire 10 into the machine cellar.
- the separating device 9 is formed here by one or two water jet nozzles which direct their water jet onto the fibrous web 9 supported on the forming screen 10 and separate a web tip from the fibrous web 9.
- the cutting device 2 can also be arranged at another point in the paper machine, wherein the fibrous web 9 can also be cut in an area supported by a wire or in an unsupported area, e.g. in a free draw.
- the fibrous web 9 can also be cut in an area supported by a wire or in an unsupported area, e.g. in a free draw.
- lasers or mechanical separating means such as rotating, preferably toothed circular knives, stationary knives or needles can also be provided.
- Mechanical release agents are generally only used when the fibrous web 9 runs unsupported.
- the threading strip 3 is guided by the dewatering belts 11, 12 through the press section and transferred to the drying wire 15 of the following drying group.
- the transfer strip 3 is brought from the drying wire 15 into contact with a rotating roller 4 in the form of the first drying cylinder 16 of the drying group.
- the transfer strip 3 is then gradually widened until the full width of the fibrous web 9 arrives at the rotating roller 4 1 and is likewise discharged into the pulper 18.
- the lower side of the fibrous web 9 opposite the upper side 9.1 comes into direct contact with the internally heated rotating roller 4, which is designed as a drying cylinder.
- the drying wire 15 presses on the top 9.1 of the fibrous web 9. While the fibrous web 9 runs down into the pulper 18, the drying wire 15 is guided away from the surface 9.1 on a runoff line 15.1 and to the next guide roll 17. The separating device is then moved back into its starting position. With a suitable design of the wet part of the paper machine, this first transfer step can also be carried out by transferring the fibrous web 9 with its full width, without having to cut a transfer strip.
- the invention can be used advantageously for the following transfer step.
- a new transfer strip 3 and a residual web 20 are formed from the fibrous web 9 wrapping around the rotating roller by the separating device 2.
- the transfer strip 3 is transferred from the wrapped roller 4 by a blow doctor (not shown) to a following machine element 5 in the form of the dryer fabric 15 of the first dryer group running from this roller 4.
- the following machine element 5 can also be formed by a rotating roller.
- a stabilizing element 6 facing the upper side 9. 1 of the fibrous web 9 is positioned on the drive side 21.
- the stabilizing element 6 is arranged in the vertical direction between the flow line 15.1 of the dryer fabric 15 and the scraper 8.
- the vertical distance 24 of the stabilizing element 6 to the horizontal plane 23 is in this example in a range of less than or equal to 0.9 times the roller radius Rw below the horizontal plane 23.
- the vertical distance 24 can also be in a range of less than or equal to 0 , 83 times the roller radius or in a range of less than or equal to 0.6 times the roller radius. This allows the size of the stabilization area to be optimized. For certain applications, it can be useful if the vertical distance 24 is greater than or equal to 0.4 times the roller radius, preferably in a range greater than or equal to 0.45 times the roller radius, in particular in one area of greater than or equal to 0.5 times the roller radius.
- the stabilizing element 6 is formed by a guide roller 6 which is axially parallel to the rotating roller 4. The guide roller 6 is positioned in accordance with FIG.
- the guide roller 6 is arranged directly in front of the scraper 8 of the rotating roller 4, which follows in the direction of rotation. This ensures that the remaining web 20 gets into the pulper 18 between the guide roller 6 and the doctor 8.
- the guide roller 6 presses the remaining web 20 slightly against the rotating roller 4, ie the drying cylinder 16.
- the guide roller 6 can therefore have its own rotary drive.
- the position of the guide roller 6 can advantageously be changed transversely to the web running direction 7, so that all web widths, degrees of overlap and cutting positions of the separating device 2 can be mastered.
- the guide roller 6 has a diameter between 30 and 300 mm and a width between 20 and 500 mm.
- the guide roller 6 has an elastic cover made of rubber, PU, fabric or the like to protect the outer surface of the rotating roller 4.
- FIG. 2 a view of the device against the production direction onto the rotating roller 4 is shown in a simplified representation while the overstrip 3 is being moved open.
- the dryer fabric 15 is not shown for the sake of clarity.
- the transfer strip 3 has already been transferred to the following machine element 5.
- the transfer strip 3 and the remaining web 20 are separated by the cutting line 2.1, which was produced by the separating device 2.
- the transfer strip 3 that has already been transferred leaves the surface of the drying cylinder 16 at the discharge line 15.1 together with that of the drying wire 15.
- the stabilizing element 6, designed as a guide roller, is arranged in the drive-side region of the remaining web 20.
- FIG. 3a shows a section from FIG. 1 with an alternative stabilizing element 6.
- a blowpipe arranged transversely to the web running direction 7 of the remaining web, which carries at least one fluid jet, for example an air jet , blows against the remaining web 20 and thereby stabilizes the run of this remaining web 20.
- the vertical distance 24 of the stabilizing element 6 to the horizontal plane 23 is in this example in a range of less than or equal to 0.9 times the roller radius Rw.
- the vertical distance 24 can also be in a range of less than or equal to 0.83 times the roller radius or in a range of less than or equal to 0.6 times of the roller radius. This allows the size of the stabilization area to be optimized. For certain applications it can be useful if the vertical distance 24 is greater than or equal to 0.4 times the roller radius, preferably in a range greater than or equal to 0.45 times the roller radius, in particular in one area of greater than or equal to 0.5 times the roller radius.
- FIG. 3b shows the use of a blowpipe arranged transversely to the direction of travel 7 of the remaining web 20, which blows at least one fluid jet, for example an air jet, against the remaining web and with a guide surface extending in the direction of travel 7 of the remaining web 20, for example a guide plate, cooperates with regard to the stabilization of the run of the remaining web 20.
- the stabilizing element 6 thus comprises a blowpipe with a guide surface.
- the fluid jet can also be directed along the guide plate, as a result of which the remaining web 20 is sucked in by the fluid jet and stabilized along the guide plate.
- the vertical distance 24 of the stabilizing element 6 to the horizontal plane 23 is in this example in a range of less than or equal to 0.9 times the roller radius Rw.
- the vertical distance 24 can also be in a range of less than or equal to 0.83 times the roller radius or in a range of less than or equal to 0.6 times the roller radius. This allows the size of the stabilization area to be optimized. For certain applications it can be useful if the vertical distance 24 is greater than or equal to 0.4 times the roller radius, preferably in a range greater than or equal to 0.45 times the roller radius, in particular in one area of greater than or equal to 0.5 times the roller radius.
Landscapes
- Paper (AREA)
- Preliminary Treatment Of Fibers (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102019134691.6A DE102019134691A1 (de) | 2019-12-17 | 2019-12-17 | Vorrichtung und Verfahren zum Überführen einer Faserstoffbahn |
| PCT/EP2020/084221 WO2021121992A1 (de) | 2019-12-17 | 2020-12-02 | Vorrichtung und verfahren zum überführen einer faserstoffbahn |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP4077804A1 true EP4077804A1 (de) | 2022-10-26 |
| EP4077804B1 EP4077804B1 (de) | 2023-03-01 |
Family
ID=72852624
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP20819688.1A Active EP4077804B1 (de) | 2019-12-17 | 2020-12-02 | Vorrichtung und verfahren zum überführen einer faserstoffbahn |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP4077804B1 (de) |
| CN (1) | CN114846203B (de) |
| DE (1) | DE102019134691A1 (de) |
| FI (1) | FI4077804T3 (de) |
| WO (1) | WO2021121992A1 (de) |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19914967A1 (de) * | 1999-04-01 | 2000-10-05 | Voith Sulzer Papiertech Patent | Auftragseinrichtung |
| US6398909B1 (en) * | 1999-06-17 | 2002-06-04 | Valmet-Karlstad Aktiebolag | Method and apparatus for imprinting, drying, and reeling a fibrous web |
| US7959761B2 (en) * | 2002-04-12 | 2011-06-14 | Georgia-Pacific Consumer Products Lp | Creping adhesive modifier and process for producing paper products |
| DE102006044930A1 (de) * | 2006-09-22 | 2008-04-03 | Voith Patent Gmbh | System zum Breitfahren einer Faserstoffbahn, Verfahren zur Steuerung der Überführ- bzw. Randstreifenüberführung und Maschine zur Herstellung einer Faserstoffbahn |
| DE102007053700A1 (de) * | 2007-11-10 | 2009-05-14 | Andritz Küsters Gmbh | Vorrichtung zum Überführen einer flexiblen Materialbahn, insbesondere einer Papier- oder Kartonbahn |
| DE102008009958B3 (de) * | 2008-02-20 | 2009-05-14 | Paprima Industries Inc., Dorval | Vorrichtung und Verfahren zum Sichern eines Bahnendes auf einem Tambour |
| DE102008042282A1 (de) * | 2008-09-23 | 2010-03-25 | Voith Patent Gmbh | Maschine zur Herstellung einer Faserstoffbahn und Verfahren zum Überführen einer Faserstoffbahn an eine Trockeneinrichtung, insbesondre Luftstromtrockeneinrichtung |
| DE102011087094A1 (de) * | 2011-11-25 | 2013-05-29 | Voith Patent Gmbh | Verfahren zur Überführung einer Materialbahn von einer Trockenanordnung zu einer nachgeordneten Funktionseinheit und Trockenvorrichtung |
| DE102011087095A1 (de) * | 2011-11-25 | 2013-05-29 | Voith Patent Gmbh | Verfahren zur Überführung einer Materialbahn von einer Trockenanordnung zu einer nachgeordneten Funktionseinheit und Trockenvorrichtung |
| DE102014219404A1 (de) * | 2014-09-25 | 2016-03-31 | Voith Patent Gmbh | Maschine und Verfahren zur Herstellung und/oder Behandlung einer Materialbahn |
| AT521367B1 (de) * | 2019-04-18 | 2020-01-15 | Andritz Ag Maschf | Vorrichtung und verfahren zum überführen eines streifens einer bahn |
-
2019
- 2019-12-17 DE DE102019134691.6A patent/DE102019134691A1/de not_active Ceased
-
2020
- 2020-12-02 WO PCT/EP2020/084221 patent/WO2021121992A1/de not_active Ceased
- 2020-12-02 CN CN202080087541.6A patent/CN114846203B/zh active Active
- 2020-12-02 FI FIEP20819688.1T patent/FI4077804T3/fi active
- 2020-12-02 EP EP20819688.1A patent/EP4077804B1/de active Active
Also Published As
| Publication number | Publication date |
|---|---|
| WO2021121992A1 (de) | 2021-06-24 |
| CN114846203A (zh) | 2022-08-02 |
| CN114846203B (zh) | 2025-10-10 |
| DE102019134691A1 (de) | 2020-11-19 |
| FI4077804T3 (fi) | 2023-05-09 |
| EP4077804B1 (de) | 2023-03-01 |
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