EP3856975A1 - Maschine und verfahren zur herstellung einer faserstoffbahn - Google Patents
Maschine und verfahren zur herstellung einer faserstoffbahnInfo
- Publication number
- EP3856975A1 EP3856975A1 EP19742197.7A EP19742197A EP3856975A1 EP 3856975 A1 EP3856975 A1 EP 3856975A1 EP 19742197 A EP19742197 A EP 19742197A EP 3856975 A1 EP3856975 A1 EP 3856975A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- layer
- water
- absorbing belt
- web
- machine according
- 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.)
- Withdrawn
Links
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F7/00—Other details of machines for making continuous webs of paper
- D21F7/08—Felts
- D21F7/083—Multi-layer felts
-
- 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
- D21F11/14—Making cellulose wadding, filter or blotting paper
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F3/00—Press section of machines for making continuous webs of paper
- D21F3/02—Wet presses
- D21F3/029—Wet presses using special water-receiving belts
-
- 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
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
- D21H27/002—Tissue paper; Absorbent paper
Definitions
- the invention relates to a machine for producing a fibrous web, in particular a tissue web, with at least one press device, which comprises a press element and a counter element with a closed surface to form a press nip, and with a water-absorbing belt with a web side and an opposite press element side, which together with the fibrous web can be guided through the press nip in such a way that the fibrous web is separated from the web side of the water-absorbing belt at the end of the press nip and continues to run with the counter element.
- a press device which comprises a press element and a counter element with a closed surface to form a press nip, and with a water-absorbing belt with a web side and an opposite press element side, which together with the fibrous web can be guided through the press nip in such a way that the fibrous web is separated from the web side of the water-absorbing belt at the end of the press nip and continues to run with the counter element.
- the invention also relates to a method for producing a fibrous web and a water-absorbing belt for use in a machine for producing a fibrous web.
- the document EP0926296 B1 shows a machine for producing a tissue web.
- a felt belt is partly guided around a forming roller together with a forming screen, forming an inlet gap.
- a pulp suspension is fed into the inlet gap via a headbox, from which the tissue web is formed.
- the forming screen is guided away and the tissue web lying on the felt belt is guided to a press nip, which is formed by a shoe roll and a Yankee drying cylinder. After the press nip, the tissue web with the Yankee drying cylinder continues for further drying.
- a suction device for loading the felt belt and the tissue web carried along is provided in front of the press nip.
- suction element for conditioning the felt belt between the press nip and the forming area outside the loop formed by the felt belt.
- suction elements are also known as Uhle boxes. The conditioning in water contained in the felt belt is removed before the pulp suspension is given up.
- the object of the invention is to provide a machine and a circulating belt and a method for reducing the energy expenditure for conditioning the circulating belt.
- the object is achieved by features of claim 1. It becomes a machine for producing a fibrous web, in particular a tissue web, with at least one pressing device, which comprises a pressing element and a counter element with a closed surface to form a press nip, and with a water-absorbing belt with a web side and an opposite pressing element side, which together with the The fibrous web can be guided through the press nip in such a way that the fibrous web is separated from the web side of the water-absorbing belt at the end of the press nip and continues to run with the counter element.
- at least one pressing device which comprises a pressing element and a counter element with a closed surface to form a press nip, and with a water-absorbing belt with a web side and an opposite pressing element side, which together with the The fibrous web can be guided through the press nip in such a way that the fibrous web is separated from the web side of the water-absorbing belt at the end of the press nip and continues to run with the counter element.
- the water-absorbing belt (3) comprises at least a first layer (15) and a second layer (16) and that the belt (3), viewed in the thickness direction of the water-absorbing belt (3), on which the pressing element (7 ) facing half, has a layer (18) which has a higher specific flow resistance than the first layer (15) and / or the second layer (16).
- the layer prevents or minimizes a backflow of the water contained in the press element-side half of the water-absorbing belt in the direction of the web side.
- the water can thus be removed more easily by a suction device arranged on the pressing element side.
- the flow resistance of a layer or layer can be determined, for example, by flowing water through the layer or layer in the thickness direction on a flow surface at a predetermined pressure difference and measuring the flow volume flow and relating it to the thickness of the layer or layer. Should he Flow resistance of different layers or layers are compared, boundary conditions must be kept constant.
- the first layer advantageously forms the web side and preferably comprises a fiber fabric made of plastic fibers.
- the first layer can be felt-like.
- the plastic fibers can be connected to the second layer, for example needled.
- the second layer can be a woven layer and the first layer can preferably be connected, in particular needled, to the second layer.
- the layer is advantageously connected to the second layer.
- the layer can be connected to the second layer and form the pressing element side of the water-absorbing belt.
- the layer forms the pressing element side.
- it forms the running side of the water-absorbing belt and is in contact with the pressing element.
- the layer can be optimized with regard to low wear due to mechanical abrasion and at the same time with regard to the flow resistance.
- a further layer can be provided on the half of the water-absorbing belt facing the pressing element, which preferably comprises a fiber fabric made of plastic fibers.
- the further layer can be needled with the layer and / or with the second layer.
- the layer can be arranged between the second layer and the further layer.
- the layer can be arranged adjacent to the further layer and form the pressing element side.
- the water-absorbing belt can be designed as a press felt.
- the layer can be designed as a membrane with openings.
- This can be, for example, a plastic film with needled or punched or laser-drilled holes.
- the layer can be carried out as a scrim made of fine fibers.
- the fiber fineness can preferably be less than or equal to 3 dtex.
- the layer can preferably at least partially comprise components made of thermoplastic polyurethane elastomer (TPU).
- TPU thermoplastic polyurethane elastomer
- the water-absorbing belt is guided through the pressing element on a partial route from the end of the press nip.
- a suction device for dewatering the water-absorbing belt can be provided on the pressing element side of the water-absorbing belt in a region of the water-absorbing belt that is free of fibrous material.
- the water-absorbing belt By guiding the water-absorbing belt on a section of the press element, the water-absorbing belt is immediately separated from the fibrous web at the end of the press nip and counteracted rewetting.
- the arrangement of the suction device within the loop formed by the water-absorbing belt for conditioning the water-absorbing belt has the advantage that the water contained in the belt can be removed with less energy. This is supported by the negative pressure created in the gusset between the water-absorbing belt and the pressing element. The water thrown back from the surface of the pressing element by the centrifugal force onto the water-absorbing belt can thus be removed directly from the surface of the belt by the suction device.
- the counter element is formed by a drying cylinder, in particular by a Yankee drying cylinder.
- the pressing element is formed by a pressing roller, preferably with an open, preferably grooved and / or drilled, surface.
- the invention has a particularly advantageous effect, since the water collected in the open surface and spun off at the end of the press nip is removed directly from the inside of the water-absorbing belt by the suction device.
- the pressing element can also be formed by a shoe pressing unit.
- the invention has a particularly advantageous effect when using a shoe press, since larger amounts of water have to be drained off.
- the open surface can comprise holes made as blind holes.
- the shoe press unit can comprise a water-impermeable jacket and a press shoe arranged inside the jacket and pressable against the counter element.
- the side of the jacket facing the pressing element side of the water-absorbing belt can have an open, preferably grooved and / or drilled, surface.
- the invention also has a particularly advantageous effect here, since that which has collected in the open surface and at the end of the press nip tends towards the strip centrifuged water is removed directly from the inside of the water-absorbing belt by the suction device.
- the partial section is preferably selected such that the direction of the water-absorbing belt which is carried away is at an angle of more than 10 °, in particular more than 15 °, preferably in the range of 20 °, to a tangent applied to the counter element at the end of the press nip. This counteracts rewetting of the fibrous web by the water-absorbing belt.
- the suction device can have a covering with openings, which are preferably designed as bores and / or slots.
- the machine can advantageously be designed as a crescent former.
- the fibrous web is guided from the forming area to the press nip on the water-absorbing belt.
- the object of the invention is also achieved by a method for producing a fibrous web, in particular a tissue web, with at least one press device which comprises a press element and a counter element with a closed surface for forming a press nip, and with a water-absorbing belt with one web side and one opposite press element side, which is guided together with the fibrous web through the press nip such that the fibrous web is separated from the web side of the water-absorbing belt at the end of the press nip and continues to run with the counter element.
- the water-absorbing band comprises at least a first layer and a second layer and that the band, viewed in the thickness direction of the water-absorbing band, has a layer on the half facing the pressing element which has a higher specific flow resistance than the first layer and / or the second layer .
- Figure 1 shows an embodiment of a machine according to the invention
- Figure 2 shows an embodiment of a pressing device of the
- Figure 3 shows an embodiment of a water-absorbing belt of a machine according to the invention for producing a
- Figure 4 shows another embodiment of a water-absorbing
- FIG. 1 shows an embodiment of a machine 1 according to the invention for producing a fibrous web 2 in a schematic representation.
- a water-absorbing belt 3 is partially guided around a forming roller 24 together with an outer screen 25, forming an inlet gap.
- a fiber suspension is fed into the inlet gap via a headbox 23, from which the fiber web 2 is formed.
- the outer wire 25 is guided away and the fibrous web 2 lying on the web side 4 of the water-absorbing belt 3 is guided to a press device 6 with a press nip 9, which is formed between a press element 7 and a Yankee drying cylinder 8.
- the pressing element 7 is formed by a shoe roller 7.
- the cylindrical surface of the Yankee drying cylinder 8 is smooth.
- nip 9 runs the fibrous web 2 with the Yankee drying cylinder 8 for further drying by means of an impact flow through a hood 21 and is creped and removed by a crepe scraper and taken to a further machine section.
- a suction-deflected roller (not shown here) or a suction element 22 for suctioning the water-absorbing belt 3 and the fiber web 2 carried along can be provided in front of the press nip 9.
- a steam or hot air blowing hood can be arranged opposite the suction element 22 in order to increase the drainage capacity.
- a suction device 12 is arranged between the press nip 9 and the forming area within the loop formed by the water-absorbing belt 3 for conditioning the water-absorbing belt 3.
- the suction device 12 has a covering with openings through which the water is sucked into the suction element and which are preferably designed as bores and / or slots.
- the suction device 12 is arranged in an area in which the water-absorbing belt 3 is free of a fibrous web 2. This facilitates and improves conditioning.
- the water of the water-absorbing belt 3 is drained to the inside, that is to the pressing element side 5, by the suction device 12.
- the shoe roll 7 comprises a press shoe 10 which can be pressed against the Yankee drying cylinder 8 to generate a press pressure in the press nip. Between the press shoe 10 and the fibrous web 2, the jacket 11 surrounding the press shoe 10 runs through the press nip 9.
- the side of the jacket 11 coming into contact with the press element side 5 of the water-absorbing belt 3 Grooves on.
- the water squeezed out of the fibrous web 2 in the area of the press nip 9 partly passes through the water-absorbing belt 3 into the grooves of the jacket 11 and is thrown from there after the press nip 9 partly due to the centrifugal force against the pressing element side 5 of the water-absorbing belt 3.
- the water-absorbing tape 3 is rewetted.
- This centrifuged water can be efficiently and with the arrangement of the suction device 12 according to the invention little energy is removed without having to suck it through the entire thickness of the water-absorbing belt 3.
- the suction device 12 can be seen in the running direction 26 of the water-absorbing belt 3, if necessary a suction element 20 can be arranged downstream.
- FIG. 2 shows an embodiment of a pressing device 6 of the machine 1 according to the invention in a schematic illustration.
- the fibrous web 2 is guided on the web side 4 of the water-absorbing belt 3 to a press device 6 with a press nip 9, which is formed between a press element 7 and a Yankee drying cylinder 8.
- the pressing element 7 is formed by a shoe roller 7.
- the cylindrical surface of the Yankee drying cylinder 8 is made smooth.
- the shoe roller 7 comprises a press shoe 10 which can be pressed against the Yankee drying cylinder 8 to generate a press pressure in the press nip 9.
- the jacket 11 surrounding the press shoe 10 runs through the press nip 9.
- the side of the jacket 11 coming into contact with the press element side 5 of the water-absorbing belt 3 an open surface, in this example grooves.
- the water squeezed out of the fibrous web 2 in the area of the press nip 9 partially passes through the water-absorbing belt 3 into the grooves of the jacket 11.
- the water-absorbing belt 3 is guided from the end of the press nip 9 through the press element 7 on a partial route.
- the length of the section is selected such that the direction of the water-absorbing belt 3 carried away to an tangent 13 applied to the counter element 8 at the end of the press nip is at an angle 14 of more than 10 °, in particular more than 15 °, preferably in the range of 20 ° occupies.
- This counteracts rewetting of the fibrous web 2 by the water-absorbing belt 3.
- the conditioning of the water-absorbing belt 3 is supported by the negative pressure which arises in the gusset between the water-absorbing belt 3 and the pressing element 7.
- the water-absorbing belt 3 shows an embodiment of a water-absorbing belt 3 of a machine 1 according to the invention for producing a fibrous web 2 in a schematic representation.
- the water-absorbing belt 3 comprises a first layer 15, a second layer 16, a further layer 17 and a layer 18 which has a higher specific flow resistance than the first layer 15 and / or the second layer 16 and / or the further layer 17.
- the web side 4 is formed by the first layer 15 and the pressing element side 5 by the further layer 17. Seen in the thickness direction of the water-absorbing belt 3, the layer 18 is arranged on the half facing the pressing element 7. The higher flow resistance of the layer 18 prevents or minimizes a backflow of the water contained in the press element side half of the water-absorbing belt 3 in the direction of the web side 4.
- the water can thus be removed more easily by the suction device 12 arranged on the pressing element side 5.
- the first layer 15 forming the web side 4 comprises a felt-like fiber fabric and is needled to the second layer 16.
- the second layer 16 is a woven layer.
- the layer 18 is worked into the further layer 17 between the second layer 16 and the pressing element side 5 and thus lies within the further layer 17.
- the layer 18 can also directly adjoin the second layer 16 and with it, for example by needling , be connected.
- the further layer 17 forming the pressing element side likewise comprises a felt-like fiber fabric and is needled to the second layer 16.
- the layer 18 is designed as a membrane with openings. This can be, for example, a plastic film with needled or punched or laser-drilled holes.
- FIG. 4 shows a further embodiment of a water-absorbing belt 3 of a machine 1 according to the invention for producing a fibrous web 2 in a schematic representation. It differs from the embodiment in FIG. 4 only in the arrangement of the layer 18 in the thickness direction of the water-absorbing belt 3.
- the layer 18 is connected to the further layer 17 and forms the pressing element side 5 of the water-absorbing belt 3.
- the layer 1 comes in the machine 1 18 in contact with the pressing element 7.
- the layer 18 is optimized with regard to low wear due to mechanical abrasion and at the same time with regard to the flow resistance.
Landscapes
- Paper (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102018123390.6A DE102018123390A1 (de) | 2018-09-24 | 2018-09-24 | Maschine und Verfahren zur Herstellung einer Faserstoffbahn |
| PCT/EP2019/069328 WO2020064167A1 (de) | 2018-09-24 | 2019-07-18 | Maschine und verfahren zur herstellung einer faserstoffbahn |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP3856975A1 true EP3856975A1 (de) | 2021-08-04 |
Family
ID=67383780
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP19742197.7A Withdrawn EP3856975A1 (de) | 2018-09-24 | 2019-07-18 | Maschine und verfahren zur herstellung einer faserstoffbahn |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US11613848B2 (de) |
| EP (1) | EP3856975A1 (de) |
| CN (1) | CN112752882B (de) |
| DE (1) | DE102018123390A1 (de) |
| WO (1) | WO2020064167A1 (de) |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3301746A (en) * | 1964-04-13 | 1967-01-31 | Procter & Gamble | Process for forming absorbent paper by imprinting a fabric knuckle pattern thereon prior to drying and paper thereof |
| EP0346307A3 (de) * | 1988-06-09 | 1991-03-06 | Nordiskafilt Ab | Nassfilz für Papiermaschine |
| DE4232319A1 (de) | 1992-09-26 | 1994-03-31 | Franz F Kufferath | Mehrlagiges Pressensieb für Naßpressen einer Papiermaschine |
| TW338078B (en) | 1996-07-08 | 1998-08-11 | Scapa Group Plc | Membrane felt for use in yankee machine |
| US6140260A (en) * | 1997-05-16 | 2000-10-31 | Appleton Mills | Papermaking felt having hydrophobic layer |
| DE19756422A1 (de) * | 1997-12-18 | 1999-06-24 | Voith Sulzer Papiertech Patent | Maschine zur Herstellung einer Faserstoffbahn, insbesondere einer Tissue-Papierbahn |
| US7128810B2 (en) * | 2002-10-10 | 2006-10-31 | Albany International Corp. | Anti-rewet press fabric |
| RU2338098C2 (ru) * | 2004-01-30 | 2008-11-10 | Фойт Пэйпер Патент Гмбх | Прессующая часть и проницаемая лента в бумагоделательной машине |
| US20050167067A1 (en) * | 2004-01-30 | 2005-08-04 | Bob Crook | Dewatering fabric in a paper machine |
| US7601659B2 (en) | 2005-04-01 | 2009-10-13 | E.I. Du Pont De Nemours And Company | Dewatering fabrics |
| DE102014213512A1 (de) * | 2014-07-11 | 2016-01-14 | Voith Patent Gmbh | Maschine zur Herstellung einer Faserstoffbahn |
-
2018
- 2018-09-24 DE DE102018123390.6A patent/DE102018123390A1/de not_active Withdrawn
-
2019
- 2019-07-18 EP EP19742197.7A patent/EP3856975A1/de not_active Withdrawn
- 2019-07-18 WO PCT/EP2019/069328 patent/WO2020064167A1/de not_active Ceased
- 2019-07-18 CN CN201980062343.1A patent/CN112752882B/zh active Active
- 2019-07-18 US US17/279,191 patent/US11613848B2/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| US20220049425A1 (en) | 2022-02-17 |
| CN112752882A (zh) | 2021-05-04 |
| DE102018123390A1 (de) | 2020-03-26 |
| CN112752882B (zh) | 2023-05-05 |
| US11613848B2 (en) | 2023-03-28 |
| WO2020064167A1 (de) | 2020-04-02 |
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