EP0282887A1 - Presswalze für die Entwässerung von Stoffbahnen - Google Patents

Presswalze für die Entwässerung von Stoffbahnen Download PDF

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Publication number
EP0282887A1
EP0282887A1 EP88103687A EP88103687A EP0282887A1 EP 0282887 A1 EP0282887 A1 EP 0282887A1 EP 88103687 A EP88103687 A EP 88103687A EP 88103687 A EP88103687 A EP 88103687A EP 0282887 A1 EP0282887 A1 EP 0282887A1
Authority
EP
European Patent Office
Prior art keywords
grooves
holes
profile
press
felt
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Withdrawn
Application number
EP88103687A
Other languages
German (de)
English (en)
French (fr)
Inventor
Timm Dr. Gudehus
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Felix Bottcher & Co KG GmbH
Felix Boettcher GmbH and Co KG
Original Assignee
Felix Bottcher & Co KG GmbH
Felix Boettcher GmbH and Co KG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Felix Bottcher & Co KG GmbH, Felix Boettcher GmbH and Co KG filed Critical Felix Bottcher & Co KG GmbH
Publication of EP0282887A1 publication Critical patent/EP0282887A1/de
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • D21F3/08—Pressure rolls
    • D21F3/086—Pressure rolls having a grooved surface

Definitions

  • the invention relates to a press roller with profiling arranged in its outer surface for the removal of liquid from material webs.
  • the wet paper web passes through one or more press nips between two co-operating rollers in order to remove the water carried from the preceding wire section in the press section of a paper machine, depending on the type of paper.
  • the paper-side press roller is generally made of a hard material such as granite or stone substitute material, whereas the felt-side press roller is used to protect the felt with an elastomeric cover made of rubber or polyurethane rubber is provided.
  • wet dewatering in the presses is not only more advantageous for the paper, but also more economical than the evaporation of the water in the subsequent dryer section, efforts are made to drive the wet dewatering in the presses as far as possible, with the success of a number of Depends on parameters, such as the type and basis weight of the paper, size of the tendency of the fabric of the paper web to dewater, fabric temperature, paper speed, type and number of presses, nature of the presses and, in connection with this, possible contact pressure according to the hardness of the roll cover, quality and permeability the felts used etc.
  • both the elastomer-related press rolls and the hard press rolls have a smooth surface, that is to say no profile.
  • the water pressed out of the paper into the felt in the roller nip can only be squeezed out in front of the nip or taken away from the felt web and the roller surface behind the nip.
  • An indirect equipment of the surface of the felt-side press with a drainage profile is achieved in a known manner by running a screen cloth made of a double-layered stable plastic screen in the form of an endless belt between the roller and the felt or such a screen cloth as a fabric jacket on the roller shrinking.
  • Venta-Nip grooves are grooves with a small pitch angle extending perpendicular to the roll axis and having a web width of approximately 2 to 3 mm and a groove width of approximately 0.3 to 0. 8 mm and a groove depth of about 2 to 3 mm.
  • blind holes with a diameter of about 2.3 to 2.5 mm and a depth of about 8 to 12 mm in the lateral surface at a mutual spacing of approximately 8 to 12 mm, or at approximately the same mutual spacing to form through the cover and the roll shell holes with a diameter of about 3.0 to 4.5 mm, which are then dewatered by a vacuum from the inside of the hollow roll.
  • these blind and suction holes have also been used with more or less success in combination with the Venta-Nip grooves.
  • An object of the present invention is to further improve the dewatering performance of profiled press rolls. Another task is to avoid the formation of profiled shadow markings, or at least to reduce them to the smallest possible extent. A further object of the invention is to create as much space as possible for the absorption of water in front of and in the roll nip in order to prevent the formation of a water wedge in the gap inlet and thus to counteract the risk of material compression.
  • this object is achieved in that the profiling is formed as grooves crossing at an angle of approximately 30 ° to 90 °.
  • the basic idea of the improved drainage achievable with the cross-groove drainage profile according to the invention is that the drainage performance in the press nip depends on the pressure difference between the cavities in the fabric web and the openings in the felt that is generally used, and this pressure difference in turn depends on the back drainage of the felt .
  • the pressure on the back of the felt In order to keep the pressure on the back of the felt low, it must be connected to an open profile surface in which the pressure is as low as possible at the shortest possible intervals. This is ensured with the profile design according to the invention in that a pressure equalization takes place in the cross groove profile due to the connection between atmospheric air pressure in the gap inlet and outlet.
  • the cross-groove profile according to the invention has various advantages, for example a uniformly finely distributed open surface of approximately 15 to 40% compared to 15 to 25% for the Venta-Nip grooves and 10 to 25% for perforated profiles.
  • the drainage paths are in the profile according to the invention with the same web width between the grooves by about a third smaller than in a Venta-Nip profile and about 40% smaller than in blind holes and about 70% smaller than in a suction roll provided with through holes.
  • the profile according to the invention results in evenly distributed small standing areas and a storage volume of up to approximately 1300 ml / m2 compared to that of only 300 to 600 ml / m2 in the case of Venta-Nip groove profiling.
  • the groove width is dimensioned with approximately 0.3 to 0.8 mm, the groove depth with approximately 2 to 4 mm and the ratio between the web and groove width with approximately 8 to 10.
  • the invention provides for the formation of rectified adjacent grooves with different depths.
  • the groove base can be rounded off according to the invention. This rounding can be exactly semicircular or in another way. It is only important that the web flanks merge into the groove base with a good fillet.
  • the jacket of the press roll with through holes in a manner known per se and to adapt the cross-groove profile with its dimensions to the selected grid of the holes or vice versa.
  • the holes are arranged helically. It is advantageous if the grooves and holes are matched to one another in such a way that each groove is connected to at least one hole, but advantageously to several holes, in the roll nip.
  • a particularly expedient arrangement results when the holes coincide with crossing points of the grooves, but this is not absolutely necessary since good drainage performance is also achieved if the grooves touch the holes off-center and in particular the latter in a known manner with inside the Suction devices provided for the rollers are connected, so that even a negative pressure is generated in the cross-groove profile.
  • the upper roll 1 is designed as a hard press roll and the lower roll 2 as a press roll with the elastomeric cover 3.
  • These rollers are provided in the usual way with the pin 4, by means of which they are mounted in the machine in a known manner and are pressed against one another in a known manner.
  • the diagonal grooves 5 are arranged at an intersection angle of here 60 °, so that they form a rhombic pattern, the longitudinal extent of the rhombuses being perpendicular to the roll axis extends.
  • blind holes or through holes 6 are provided at individual corner or intersection points of the diagonal grooves.
  • the arrows 7 indicate the direction of rotation of the roller and the arrows 8 the direction of flow of the water squeezed out of the paper web or from the felt.
  • the dashed lines 9 and 10 indicate the watersheds of the individual raised areas 11 of the elastomer cover 3 formed between the grooves 5.
  • the isobars that form in these fields during the pressing process, i.e. Lines of the same pressure are denoted by 12.
  • the arrows 13 show the flow direction of the water expressed by the pressure of the fields 11 on the paper web or on the felt.
  • the elastomer cover 3 of the roller 2 undergoes deformation in the circumferential direction of the roller, but in such a way that this deformation in the longitudinal direction of the roller at all points of the individual axially parallel surface lines is the same size.
  • blind holes and / or through holes can also be provided in all corner or crossing points of the grooves, but also in an irregular sequence and in a more or less large number.
  • the holes which can also have a different cross-sectional shape, can also be arranged with respect to the grooves in such a way that they only touch the grooves or meet them off-center.
  • the rhombuses could also extend with their main direction parallel to the roller axis or at any angle to it. However, it is particularly expedient with regard to the action on the material passing through the roll nip if the diamonds extend with their main direction at least approximately in the direction of the roll axis or perpendicularly to it.
  • the crossing angle of the grooves is dimensioned at 90 °, so that square and / or rectangular standing surfaces are formed between the grooves, it proves to be particularly advantageous with regard to the pressure exerted on the fabric web, the grooves being as parallel as possible or to be arranged perpendicular to the roller axis. With a precisely square design of the standing surfaces, the grooves can equally well extend at an angle of 45 ° to the roller axis.
  • the grooves can of course also be provided in a hard press roll without a cover, instead of in an elastomeric roll cover made of rubber or polyurethane rubber.
  • the cross-sectional shape and the dimensions of the grooves (and possibly holes) as well as their number and distances from one another and their pitch with respect to the roller axis are of course in each case in coordination with the parameters mentioned in the introduction set in the best possible way.

Landscapes

  • Paper (AREA)
  • Massaging Devices (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Rolls And Other Rotary Bodies (AREA)
EP88103687A 1987-03-17 1988-03-09 Presswalze für die Entwässerung von Stoffbahnen Withdrawn EP0282887A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3708605 1987-03-17
DE19873708605 DE3708605A1 (de) 1987-03-17 1987-03-17 Presswalze fuer die entwaesserung von stoffbahnen

Publications (1)

Publication Number Publication Date
EP0282887A1 true EP0282887A1 (de) 1988-09-21

Family

ID=6323259

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88103687A Withdrawn EP0282887A1 (de) 1987-03-17 1988-03-09 Presswalze für die Entwässerung von Stoffbahnen

Country Status (5)

Country Link
EP (1) EP0282887A1 (no)
JP (1) JPS63295789A (no)
DE (1) DE3708605A1 (no)
FI (1) FI881243A (no)
NO (1) NO881156L (no)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0411444A2 (de) * 1989-08-03 1991-02-06 Schwäbische Hüttenwerke Gesellschaft mit beschränkter Haftung Verfahren zum Einbringen von Rillen in Walzenoberflächen, sowie eine nach diesem Vefahren bearbeitete Walze
US5351399A (en) * 1989-08-03 1994-10-04 Schwabische Huttenwerke Gmbh Method for forming grooves in roll surfaces
US6029570A (en) * 1997-05-30 2000-02-29 Voith Sulzer Papiermaschinen Gmbh Press jacket for a press device
EP1247895A2 (en) * 2001-04-06 2002-10-09 Metso Paper, Inc. Press roll belt and a press concept
WO2013037526A1 (de) * 2011-09-16 2013-03-21 Voith Patent Gmbh Walze und verfahren zur herstellung einer walze
WO2013037525A1 (de) * 2011-09-16 2013-03-21 Voith Patent Gmbh Walze mit walzenbezug

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE9000821U1 (de) * 1990-01-25 1990-04-26 Enowa, Eberhard Nowak, 8037 Olching Walzenbahntrockner
DE4340724A1 (de) * 1993-11-30 1995-06-01 Sigri Great Lakes Carbon Gmbh Mit Fasern verstärkte Kunststoffwalze mit Rautierung
DE19704145A1 (de) * 1997-02-04 1998-08-06 Voith Sulzer Papiermasch Gmbh Maschine zur Herstellung einer Faserstoffbahn
DE19819526A1 (de) † 1998-04-30 1999-11-04 Voith Sulzer Papiermasch Gmbh Preßmantel
US7166195B2 (en) * 2003-07-15 2007-01-23 Albany International Corp. Grooved and perforated layer for use in papermakers' fabric
DE102009028215B3 (de) 2009-08-04 2010-09-09 Voith Patent Gmbh Kombination eines Pressfilzes mit einem Presswalzenbezug und/oder einem Saugwalzenbezug für eine Papiermaschine
US10563354B2 (en) * 2012-04-06 2020-02-18 Stowe Woodward Licensco Llc Hydrophobic and/or amphiphobic roll cover
EP3324426B1 (en) * 2016-11-16 2021-05-05 ATOTECH Deutschland GmbH Transport roller
CN117960675B (zh) * 2024-03-28 2024-06-25 福州友洗智能物联网科技有限公司 一种节水环保移动车载清洗机

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1050823A (no) * 1900-01-01
FR1361432A (fr) * 1963-04-03 1964-05-22 Neyrpic Ets Perfectionnements aux presses à cylindres aspirants pour matériaux en bandes
GB1157407A (en) * 1967-05-15 1969-07-09 Griffith Rubber Mills Improvements in or relating to Suction Rolls for the Press Section of a Paper Machine
GB1220126A (en) * 1968-05-10 1971-01-20 Millspaugh Ltd Improvements in or relating to paper-making machines
FR2104562A5 (en) * 1970-08-20 1972-04-14 Dominion Eng Works Ltd Paper web dehydrating cylinder - with helical grooves connected by radial bores to suction source
DE2150837A1 (de) * 1971-04-05 1972-10-19 Andritz Ag Maschf Presswalzenpaar fuer die Entwaesserung von Zellstoff od.dgl.

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1050823A (no) * 1900-01-01
FR1361432A (fr) * 1963-04-03 1964-05-22 Neyrpic Ets Perfectionnements aux presses à cylindres aspirants pour matériaux en bandes
GB1157407A (en) * 1967-05-15 1969-07-09 Griffith Rubber Mills Improvements in or relating to Suction Rolls for the Press Section of a Paper Machine
GB1220126A (en) * 1968-05-10 1971-01-20 Millspaugh Ltd Improvements in or relating to paper-making machines
FR2104562A5 (en) * 1970-08-20 1972-04-14 Dominion Eng Works Ltd Paper web dehydrating cylinder - with helical grooves connected by radial bores to suction source
DE2150837A1 (de) * 1971-04-05 1972-10-19 Andritz Ag Maschf Presswalzenpaar fuer die Entwaesserung von Zellstoff od.dgl.

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0411444A2 (de) * 1989-08-03 1991-02-06 Schwäbische Hüttenwerke Gesellschaft mit beschränkter Haftung Verfahren zum Einbringen von Rillen in Walzenoberflächen, sowie eine nach diesem Vefahren bearbeitete Walze
EP0411444A3 (en) * 1989-08-03 1991-09-11 Schwaebische Huettenwerke Gesellschaft Mit Beschraenkter Haftung Process for grooving roll surfaces and a roll treated according to this process
US5351399A (en) * 1989-08-03 1994-10-04 Schwabische Huttenwerke Gmbh Method for forming grooves in roll surfaces
US6029570A (en) * 1997-05-30 2000-02-29 Voith Sulzer Papiermaschinen Gmbh Press jacket for a press device
EP1247895A2 (en) * 2001-04-06 2002-10-09 Metso Paper, Inc. Press roll belt and a press concept
EP1247895A3 (en) * 2001-04-06 2006-09-13 Metso Paper, Inc. Press roll belt and a press concept
WO2013037526A1 (de) * 2011-09-16 2013-03-21 Voith Patent Gmbh Walze und verfahren zur herstellung einer walze
WO2013037525A1 (de) * 2011-09-16 2013-03-21 Voith Patent Gmbh Walze mit walzenbezug

Also Published As

Publication number Publication date
JPS63295789A (ja) 1988-12-02
FI881243A0 (fi) 1988-03-16
DE3708605A1 (de) 1988-09-29
NO881156D0 (no) 1988-03-16
NO881156L (no) 1988-09-19
FI881243A (fi) 1988-09-18

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