WO2022207248A1 - Mehrlagenformer - Google Patents
Mehrlagenformer Download PDFInfo
- Publication number
- WO2022207248A1 WO2022207248A1 PCT/EP2022/055795 EP2022055795W WO2022207248A1 WO 2022207248 A1 WO2022207248 A1 WO 2022207248A1 EP 2022055795 W EP2022055795 W EP 2022055795W WO 2022207248 A1 WO2022207248 A1 WO 2022207248A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- headbox
- framing component
- layer
- fibrous material
- section
- Prior art date
Links
- 239000002657 fibrous material Substances 0.000 claims abstract description 46
- 238000009432 framing Methods 0.000 claims description 53
- 210000000481 breast Anatomy 0.000 claims description 23
- 239000000463 material Substances 0.000 claims description 22
- 239000004567 concrete Substances 0.000 claims description 21
- 229910000831 Steel Inorganic materials 0.000 claims description 14
- 239000010959 steel Substances 0.000 claims description 14
- 238000005260 corrosion Methods 0.000 claims description 10
- 230000007797 corrosion Effects 0.000 claims description 10
- 238000004519 manufacturing process Methods 0.000 claims description 7
- 238000009434 installation Methods 0.000 claims description 2
- 239000000725 suspension Substances 0.000 description 10
- 239000000835 fiber Substances 0.000 description 6
- 238000004140 cleaning Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 239000012459 cleaning agent Substances 0.000 description 2
- 238000009415 formwork Methods 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 description 1
- 229920000877 Melamine resin Polymers 0.000 description 1
- 239000004640 Melamine resin Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000007888 film coating Substances 0.000 description 1
- 238000009501 film coating Methods 0.000 description 1
- 239000011372 high-strength concrete Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000005011 phenolic resin Substances 0.000 description 1
- 229920001568 phenolic resin Polymers 0.000 description 1
- 239000011120 plywood Substances 0.000 description 1
- 239000002952 polymeric resin Substances 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F9/00—Complete machines for making continuous webs of paper
- D21F9/003—Complete machines for making continuous webs of paper of the twin-wire type
- D21F9/006—Complete machines for making continuous webs of paper of the twin-wire type paper or board consisting of two or more layers
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
- D21F11/02—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines of the Fourdrinier type
- D21F11/04—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines of the Fourdrinier type paper or board consisting on two or more layers
Definitions
- the invention relates to a multi-ply former for a paper, board or tissue manufacturing machine for producing at least three-ply paper, board or tissue paper.
- the multi-layer former comprises an upper first headbox, an upper second headbox and a lower third headbox.
- the upper first headbox is associated with a first wire for conveying a first fibrous material layer along an upper first dewatering section in the machine direction.
- the upper second headbox is associated with a second wire for conveying a second fibrous material layer along an upper second drainage section counter to the machine direction.
- the end of the first dewatering line and the end of the second dewatering line are arranged adjacent to each other and the first pulp sheet and the second pulp sheet are brought together between the two ends.
- the lower third headbox is associated with a third wire for conveying a third fibrous web along a lower third dewatering section in the machine direction.
- a multi-ply former is known in principle and is usually used as part of a paper, board or tissue manufacturing machine to form individual fibrous plies and combine the fibrous plies to form a multi-ply fibrous web.
- a fibrous material suspension in particular a fibrous material-water mixture, is applied to an associated screen by means of a headbox.
- the screen conveys the fibrous web along a dewatering path, with the fibrous material being formed into a structure forming the fibrous web during dewatering.
- the formation of the fibrous material in the fibrous material layer and the strength of the fibrous material layer formed is determined, among other things, by the length of the dewatering section.
- the lower fibrous material layer formed by means of the lower headbox and the lower dewatering section has a sufficiently high strength as the basis for the upper fibrous material layers supplied from the upper headboxes. It applies here that the strength of a fibrous material layer increases with an increasing degree of dewatering, which is why the lower dewatering section for the lower fibrous material layer is comparatively longer than the respective upper dewatering sections.
- the lower third headbox is upstream of the upper first headbox in the machine direction.
- the overall structure of the multi-layer former is lengthened in the machine direction.
- a longer multi-layer former takes up more space and is therefore more expensive.
- the object is achieved by a multi-layer former with the features of claim 1 and in particular in that the end of the lower third drainage section is arranged below the upper second drainage section, and that the first fibrous material layer and the second fibrous material layer are brought together with the third fibrous material layer in the area the end of the lower third dewatering section and in the area of a couch roll.
- the couch roll is suitably located inside the loop of the upper second wire.
- the invention is based on the general idea that the length of a multi-layer former can be shortened by combining the first fibrous material and the second fibrous material with the lower third fibrous material in an intermediate area below the ends of the upper first drainage section and the upper second Drainage section takes place, but shifted in the machine direction in an area which is located below the second drainage section.
- the machine direction end of the lower third drainage run is tucked under the upper second drainage run.
- the lower third headbox associated with the lower third dewatering section is also shifted in the machine direction, so that the lower third headbox moves closer to the upper first headbox when viewed in the machine direction. This shortens the length of the multi-layer former in the machine direction and the multi-layer former takes up less space overall.
- the shortened design of the multi-layer former results in the advantage that catwalks for personnel aligned in the machine direction and a wire water vessel catching the suspension solution can also be shortened, which further reduces costs.
- the start of a dewatering section is determined by the area where the pulp suspension from the head outlet hits the wire.
- the end of the dewatering section is defined as the area where the fibrous material layer conveyed along the dewatering section is brought together with at least one other fibrous material layer.
- a particularly compact construction of the multi-layer former can be achieved in that the upper first headbox and the lower third headbox are arranged at least approximately directly one above the other. Likewise, the fact that a deflection roller is arranged at the end of the lower third wire at least approximately directly below the upper second headbox can contribute to a compact structure of the multi-layer former.
- a wire section is usually provided between the end of the third dewatering section and the order guide roller at the end of the lower third wire, in particular along which the multi-layer fibrous web is conveyed to the order guide roller at the end of the lower third wire.
- the screen section In the area of the screen section, it is necessary to support the screen against a fluttering movement.
- the end of the lower, third drainage section is shifted in the direction of the deflection roller at the end of the lower, third wire, so that the total section of the wire is shortened.
- no support for the screen is then required in a free screen section.
- a free wire section without support can be provided between the end of the third dewatering section and the deflection roller at the end of the lower third wire.
- the upper first headbox and the lower third headbox are usually each supported by means of their own framing component. Due to the shortening of the multi-layer former due to the relocation of the end of the lower third drainage section under the upper second drainage section, it is also possible for the upper first headbox and the lower third headbox to be supported by a common framing component. As a result, only one framing component is required, which means that costs can be reduced.
- the first headbox and the third headbox are ideally arranged vertically one above the other on the framing component.
- the framing component can serve not only to accommodate the upper first headbox and the lower third headbox, but also to accommodate a first breast roll assigned to the first headbox. Additionally or alternatively, the framing component can accommodate a third breast roll assigned to the third headbox. Such a configuration is particularly advantageous since the breast roll is the first roll in the wire section and is located directly below the headbox.
- the breast roller or each breast roller can be mounted on the framing component so that it can pivot, in particular downwards.
- a lockable rotary bearing or pivot bearing is preferably used for the pivotable mounting of the breast roll.
- receiving openings for receiving scaffold mounts are provided in the framing component.
- the receiving openings can each have an opening section aligned parallel to the machine direction.
- the frame holders can be pushed in in a simple manner and are preferably pre-aligned for longitudinal components of the multi-layer former in the machine direction.
- the framing component can have at least one walking area, which is aligned essentially parallel to the installation orientation of the headboxes.
- the walking area enables the or each headbox and/or the or each breast roll to be accessed particularly easily by the operating or maintenance personnel.
- the walking area can replace at least one crosswalk with console attachment, so that the walking area also performs a stabilizing function.
- the framing component is preferably made of concrete, in particular ultra-high-strength concrete, or steel.
- the concrete material or the steel material preferably has a compressive strength of 100 to 800 N/mm 2 .
- the framing component can also be made of concrete or steel.
- the framing component can be a concrete component reinforced by means of a steel framework.
- the framing component can be produced by means of a concrete casting process.
- the above-mentioned receiving openings can already be introduced during the casting process. Due to the dewatering of the fiber layers, the multi-ply former is exposed to a particularly humid environment. It is therefore advantageous if the concrete material and/or the steel material is/are corrosion-resistant.
- the concrete material and/or the steel material can have an additional corrosion-resistant surface. If the concrete material and/or the steel material is made of a non-corrosion-resistant material, the concrete material and/or the steel material should have at least one corrosion-resistant surface.
- a corrosion-resistant concrete can be produced, for example, by adding a polymer resin.
- the concrete material and/or the steel material or their surfaces is or are preferably also resistant to cleaning agents which are sometimes required for cleaning the multi-layer former.
- the cleaning of the framing component is also made easier because the framing component has a smooth surface.
- a smooth concrete surface can be achieved, for example, by a smooth formlining of the formwork used during concrete pouring.
- a smooth formlining is possible, for example, using plastic formwork or polished sheet metal.
- a smooth skin can be achieved by plywood panels with a film coating of a plastic such as phenolic resin or melamine resin.
- the invention also relates to a framing component for a multi-ply former of a paper, board or tissue manufacturing machine, in particular for a multi-ply former of the type described above, the framing component carrying an upper headbox and the same framing component carrying at least one lower headbox separate from the upper headbox.
- the upper headbox and the lower headbox are arranged at least approximately directly one above the other.
- 1 is a side view of a multi-ply former.
- FIG. 1 shows a multi-ply former for a paper, board or tissue manufacturing machine for producing at least three-ply paper, board or tissue paper. Also indicated in FIG. 1 is a press section downstream of the multi-layer former in the machine direction (arrow P). Referring to Fig. 1, the press section is on the left side of the sheet.
- the multi-layer former comprises three headboxes 10, 12, 14. Namely an upper first headbox 10, an upper second headbox 12 and a lower third headbox 14.
- the headboxes 10, 12, 14 are used to feed a fibrous stock suspension onto a screen 16 assigned to the respective headboxes, 18, 20 to raise.
- the screens 16, 18, 20 remove excess suspension liquid, such as water, from the pulp suspension. By removing the suspension liquid, the fibrous material forms and forms a still moist fibrous layer, which is conveyed by means of the respective screens 16, 18, 20.
- the screens 16, 18, 20 are designed as rotating screens 16, 18, 20 and are guided by means of several guide rollers 22 and a couch roll 22' arranged within the loop of the upper second screen 18.
- the couch roll 22 ' In the area of the couch roll 22 'on the upper seven 16, 18 formed pulp lay on the pulp formed on the lower third wire 20 lay couched.
- at least one of the deflection rollers 22 or the couch roller 22' which also functions as a deflection roller in order, can be configured as an actively driven roller.
- the direction roller 22 directly assigned to the respective headbox 10, 12, 14 should be emphasized, which is also referred to as the breast roller 24.
- the respective breast roll 24 is arranged at the beginning 38 of the respective dewatering section 26, 28, 30.
- the upper first headbox 10 is assigned a first wire 16 which conveys a first fibrous material layer along an upper first dewatering section 26 in the machine direction P.
- the upper second headbox 12 is associated with a second wire 18 which would convey a second fibrous material layer along an upper second dewatering path 28 counter to the machine direction P.
- a third wire 20 is associated with the lower third headbox 14 and conveys a third layer of fibrous material along a lower third drainage section 30 in the machine direction P.
- the third drainage section 30 is arranged below the first drainage section 26 and the second drainage section 28, which is why the third drainage section 30 is also referred to as the lower drainage section 30 and the first drainage section 26 and the second drainage section 28 are referred to as the upper drainage sections 26, 28.
- Each of the dewatering sections 26, 28, 30 comprises a plurality of dewatering boxes 32 which are arranged below the screens 16, 18, 20 receiving the fibrous layers and which collect the suspension liquid removed from the fibrous suspension.
- the respective dewatering sections 26, 28, 30 have their respective start 38 where the pulp suspension from the head outlet 10, 12, 14 impinges on the wire 16, 18, 20.
- the end 40', 40", 40" of the dewatering section 26, 28, 30 is defined as the area at which the fibrous material layer conveyed along the dewatering section 26, 28, 30 is combined with at least one other fibrous material layer.
- the end 40' of the first drainage section 26 and the end 40'' of the second drainage section 28 are arranged adjacent to one another.
- the ends 40', 40" of the first dewatering section 26 and the second dewatering section 28 more precisely between the ends 40', 40" of the first dewatering section 26 and the second dewatering section 28, the first fibrous material layer and the second fibrous material layer are brought together.
- the merged first and second fibrous layers are in turn merged with the third fibrous layer at the end 40'' of the third dewatering section 30 to form the three-layer fibrous web.
- the lower drainage section 30 is longer than the respective upper drainage sections 26, 28.
- a longer lower drainage section 30 ensures that the lower third fiber layer has a sufficiently high strength when the first and second fibrous material layers coming from above would be supplied to the lower third fibrous material layer.
- Fig. 1 also shows that the end 40'' of the lower third drainage section 30 is below the upper second drainage section 28 is arranged.
- the shifting of the end 40'' of the lower third dewatering section 30 does not shift the start of the press section following the multi-layer former. Rather, a deflection roller 42 located upstream of the press section at the end of the lower third wire is still at least approximately below the second upper headbox 12.
- a wire section 44 which runs between the end 40'' of the lower third dewatering section 30 and the deflection roller 42 at the end of the lower third wire.
- the shortened screen section 44 Due to the shortened screen section 44, it is possible to dispense with supporting elements to prevent an undesired fluttering movement of the lower third screen 20. It is thus possible to convey the lower third screen 20 along a free screen path 46 without support. At this point it should be noted that the shortened wire section 44 can have further dewatering boxes 32 for additional dewatering of the multi-layer fibrous web.
- the relocation of the end 40'' of the lower third dewatering section 30 under the upper second dewatering section 28 also enables the upper first headbox 10 and the lower third headbox 14 to be arranged directly one above the other, which shortens the overall length of the multilayer former in the machine direction.
- the upper first headbox 10 and the lower third headbox 14 arranged directly below it to be supported by means of a common vertical framing component 48 .
- the first headbox 10 is arranged at least approximately vertically above the third headbox 16 on the common framing component 48 .
- the framing component 48 not only accommodates the upper first headbox 10 and the lower third headbox 16, but also a first breast roller 24 assigned to the first headbox 10 and a third breast roller 24 assigned to the third headbox 16.
- a breast roll 24 can be accommodated by a framing component which is formed separately from the framing component 48 accommodating the headboxes 10, 16.
- the breast rollers 24 are pivoted on the framing component 48 .
- the breast rollers 24 can preferably be pivoted downwards.
- Rotating or pivoting bearings are provided for mounting the breast rolls.
- the breast roll 24 assigned to the second headbox 12 can also be pivotably mounted, but on a vertical framing component 34 which accommodates the second headbox 12 .
- the framing component 48 accommodating the first headbox 10 and the third headbox 16 also has accommodating openings (not shown) for accommodating framework mounts.
- the receiving openings each have an opening section aligned parallel to the machine running direction P.
- the framing component 48 accommodating the first headbox 10 and the third headbox 16 is a walking area, which cannot be seen in FIG.
- the walking area is used for better accessibility to the headboxes 10, 16 and the breast rolls 24.
- the walking area replaces at least one cross catwalk and thus contributes to the stabilization of the framing component 48.
- the framing component 48 accommodating the first headbox 10 and the third headbox 16 and the other vertical and horizontal framing components 34, 36 of the multi-layer former are made of corrosion-resistant concrete or corrosion-resistant steel in order to cope with the humid environmental conditions in the area of the multi-layer former.
- the concrete material or the steel material has at least one corrosion-resistant surface.
- the corrosion resistance of the concrete material or the steel material is also advantageous during the cleaning of the framing components 34, 36, 48 with cleaning agents.
- a smooth surface of the framing components 34, 36, 48 also makes it easier to clean the multi-layer former.
Landscapes
- Paper (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN202280024909.3A CN117062951A (zh) | 2021-03-29 | 2022-03-08 | 多层成型机 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102021107854.7A DE102021107854A1 (de) | 2021-03-29 | 2021-03-29 | Mehrlagenformer |
DE102021107854.7 | 2021-03-29 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2022207248A1 true WO2022207248A1 (de) | 2022-10-06 |
Family
ID=80928772
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2022/055795 WO2022207248A1 (de) | 2021-03-29 | 2022-03-08 | Mehrlagenformer |
Country Status (3)
Country | Link |
---|---|
CN (1) | CN117062951A (de) |
DE (1) | DE102021107854A1 (de) |
WO (1) | WO2022207248A1 (de) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102023114091A1 (de) | 2023-05-30 | 2024-06-20 | Voith Patent Gmbh | Verfahren und Vorrichtung zur Herstellung einer Faserstoffbahn |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19920438A1 (de) * | 1999-05-04 | 2000-11-09 | Voith Sulzer Papiertech Patent | Verfahren und Vorrichtung zum Herstellen einer mehrlagigen Faserstoffbahn |
DE102012217398A1 (de) * | 2012-09-26 | 2014-05-15 | Voith Patent Gmbh | Papiermaschine mit Vollstromentlüftung |
DE102014210883A1 (de) * | 2014-06-06 | 2015-06-11 | Voith Patent Gmbh | Einrichtung zum Herstellen einer Faserstoffbahn |
DE102015225540A1 (de) * | 2015-12-17 | 2016-12-29 | Voith Patent Gmbh | Mehrlagenformer und verfahren zum aufbau eines mehrlagenformers |
DE102015225541A1 (de) * | 2015-12-17 | 2016-12-29 | Voith Patent Gmbh | Mehrlagenformer und verfahren zum aufbau eines mehrlagenformers |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10304393A1 (de) | 2003-02-04 | 2004-08-19 | Voith Paper Patent Gmbh | Vorrichtung zum Abtrennen eines Randes von einer Faserstofflage |
DE102009001883A1 (de) | 2009-03-26 | 2010-09-30 | Voith Patent Gmbh | Papiermaschinenbauteile |
-
2021
- 2021-03-29 DE DE102021107854.7A patent/DE102021107854A1/de active Pending
-
2022
- 2022-03-08 CN CN202280024909.3A patent/CN117062951A/zh active Pending
- 2022-03-08 WO PCT/EP2022/055795 patent/WO2022207248A1/de active Application Filing
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19920438A1 (de) * | 1999-05-04 | 2000-11-09 | Voith Sulzer Papiertech Patent | Verfahren und Vorrichtung zum Herstellen einer mehrlagigen Faserstoffbahn |
DE102012217398A1 (de) * | 2012-09-26 | 2014-05-15 | Voith Patent Gmbh | Papiermaschine mit Vollstromentlüftung |
DE102014210883A1 (de) * | 2014-06-06 | 2015-06-11 | Voith Patent Gmbh | Einrichtung zum Herstellen einer Faserstoffbahn |
DE102015225540A1 (de) * | 2015-12-17 | 2016-12-29 | Voith Patent Gmbh | Mehrlagenformer und verfahren zum aufbau eines mehrlagenformers |
DE102015225541A1 (de) * | 2015-12-17 | 2016-12-29 | Voith Patent Gmbh | Mehrlagenformer und verfahren zum aufbau eines mehrlagenformers |
Also Published As
Publication number | Publication date |
---|---|
DE102021107854A1 (de) | 2022-09-29 |
CN117062951A (zh) | 2023-11-14 |
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