EP1103654A2 - Improvements in roll covers - Google Patents
Improvements in roll covers Download PDFInfo
- Publication number
- EP1103654A2 EP1103654A2 EP00309226A EP00309226A EP1103654A2 EP 1103654 A2 EP1103654 A2 EP 1103654A2 EP 00309226 A EP00309226 A EP 00309226A EP 00309226 A EP00309226 A EP 00309226A EP 1103654 A2 EP1103654 A2 EP 1103654A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- roll
- roll cover
- bores
- blind
- cover
- 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
Images
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
- D21F3/083—Pressure rolls perforated
-
- 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
- D21F3/10—Suction rolls, e.g. couch rolls
- D21F3/105—Covers thereof
Landscapes
- Paper (AREA)
- Rolls And Other Rotary Bodies (AREA)
- Machines For Manufacturing Corrugated Board In Mechanical Paper-Making Processes (AREA)
- Massaging Devices (AREA)
Abstract
Description
- The present invention relates to improvements in roll covers, applicable to all industrial rolls, but in particular to rolls used in the press-section or forming section of paper, pulp and board making machines.
- It is known to use two adjacent rolls in paper machines and the like to provide a press-nip to dewater paper during its production. This usually involves feeding the paper between the two rolls and effectively squeezing the water out into an accompanying press felt or felts.
- It is known to replace at least one of the plain rolls by a suction roll comprising a drilled shell and a suction box which is connected to a vacuum system and which pulls water through the drilled shell hence providing an easier escape route for the water pressed out of the paper. However, most of the expressed water must still travel laterally to reach a drilled hole. Also, there is a limit to the pressure that can be applied by a hollow perforated shell, therefore there is a reduced amount of water expressed in comparison to a plain roll. Furthermore, suction rolls are also prone to stress fatigue and can cause shadow marking on the paper.
- To overcome this solid grooved rolls were developed, in which a continuous groove is cut spirally in the roll cover, the groove providing an easily accessible escape route for expressed water. The helically-cut grooves are typically 2.5 mm (0.1 inch) in depth, 0.5 mm (0.02 inch) wide on 3.2 mm (0.125 inch) centers (ie 8 grooves per inch). The maximum lateral distance for water travel in the grooved press is, therefore, only 1.3 mm (0.05 inch), as compared to typical figures of 5 mm and 20 mm, respectively, for the suction and plain presses.
- A grooved roll is usually solid and a higher pressure can be applied at the nip in comparison to a suction roll, therefore more water can be expressed. However, the roll covers must be very hard to maintain groove integrity, and this can lead to damage of the paper.
- In a blind drilled roll, the roll is drilled with small closely spaced holes. These holes self clear/empty by the action of the centrifugal force. Because of the greater void volume in comparison to a grooved roll, there is a lower risk of the holes closing, hence the blind-drilled hole can be a softer roll than that of a grooved-roll and therefore create less damage to the paper. However due to the nip pressure, air and water are forced into the blind-drilled hole and in order to prevent a stress fracture line from developing in the rolls, the blind-drilled holes do not have a constant depth but have a variety of different depths. This has the drawback that varying back pressures can occur resulting in shadow marking of the sheet and a working of the press-felt which reduces its longevity, especially in the presence of abrasive fillings such as calcium carbonate.
- It is known to provide a combination of suction holes, blind-drilled holes and grooves in a polyurethane cover of a suction roll. The suction holes are through bores extending all the way through the cover and mating with respective shell perforations. It is known to provide each through-bore with a diameter of 3mm which is equal to the diameter of the shell perforation. The blind-drilled holes are bored into the land area between the suction holes and have a diameter of 2.2 mm. The grooves are cut into the surface in order to further boost the open area. The smaller diameter of the blind-drilled holes in comparison to that of the suction holes has prevailed because of the danger of causing the remaining land areas to be lacking in substance. Despite its inherent toughness, polyurethane will break-off the roller surface if there is insufficient material present. The difference in diameter between the two types of holes creates a further pressure difference in addition to that provided due to the varying depths between the different depth of blind-drilled holes and now also the suction holes which increases the incidence of shadow marking of the paper and also working of the felt as described hereinabove. In order to try to reduce the incidence of shadow marking it is essential to increase the open area of the roll from 40% to 50% in order to reduce the hydraulic pressure in the pressure nip. This then reduces the stability of the holes and grooves in the more open roll cover surface resulting in a higher incidence of breakdown of polyurethane around the holes and grooves.
- It is an object of the present invention to provide a roll which overcomes or alleviates the above described disadvantages of the known rolls.
- In accordance with one aspect of the present invention there is provided a roll cover for a roll, comprising an outwardly presented work-contacting surface which has an even distribution of bores of equal cross-sectional area.
- This has the advantage that the equal distribution coupled with the equal diameter evens the pressure distribution and thereby reduces the incidence of shadow marking. Furthermore, the equality of the distribution and of the cross sectional area allows the reduction in the hydraulic pressure at the press-nip allowing the open area in the surface to be reduced yielding an improvement in the surface integrity.
- Preferably the bores comprise blind holes and a continuous circumferential groove extends helically in and about the roll cover surface and cuts through each of the blind bores. This has the advantage that the blind-drilled holes serve as temporary pressure relief vessels at the mid point of the nip when water is being expressed and the grooves provide additional open area for the water to thereby further improve the pressure distribution and thereby more readily compensate for bores of different depths with a consequent reduction in the incidence of shadow marking. Allowing the provision of different depths of grooves improves the integrity of the structure of the cover because of the further consequential reduction in hydraulic pressure leading to a further reduction in open area and increase in the surface integrity
- In accordance with a second aspect of the present invention there is provided a roll cover for a roll, comprising an outwardly presented work contacting surface in which is provided a plurality of through bores and a plurality of blind-drilled holes, the cross-sectional area of each through bore being substantially the same as that of each blind-drilled hole.
- The equal surface area of the through-bores in comparison to the blind-bores improves pressure distribution as described with subsequent improvement of surface integrity.
- Preferably, a continuous circumferential groove is provided in said work surface. This provides an additional path for the expressed water.
- Preferably, said groove connects the blind-bores and/or through bores. This has the advantage that the groove provides an additional channel for expressed water and thereby helps equalize pressure between the different depth of bores allowing the blind-bores to have a variety of depths and thereby reduce the occurrence of stress fractures. In known systems the grooves did not cut through, or pass by a substantially number of the different bores.
- Preferably, the groove extends helically about the work surface. By this means the groove can provide a more constant or continuous pressure relief channel and connect a larger number of bores.
- Preferably, the groove has a semi-circular base. This has the advantage that it reduces frictional resistance to water flow therein.
- Preferably there is an even distribution of through bores and/or of blind-drilled holes. The even distribution further enhancing said pressure distribution, which is more preferably improved if each through bore is surrounded by an even distribution of blind-drilled holes and more preferably each through bore is not immediately adjacent another through bore.
- In a preferred embodiment the roll cover is provided on a homogeneous hollow shell.
- In a further preferred embodiment the roll cover is provided on a perforated hollow shell. This allows drainage to the interior of the shell.
- Preferably, the through bores in the cover are aligned with a respective shell perforation to provide a suction hole in the roll.
- Preferably, the cross-sectional area of each shell perforations is greater than the cross-sectional area of each through bore. This allows the through bore to be reduced in diameter so as to be equal in size to the traditionally smaller blind-bores. This allowing a reduction in the surface open area with the advantages described above, whilst allowing the suction pressure to be maintained via the larger shell perforation which is enhanced by the reduced channel through the through bore.
- In a preferred embodiment suction means is provided within the shell to draw water through the suction holes.
- Preferably, the suction means is an internal foil within the suction roll the activation of which produces a suction pressure with the suction holes. This has the advantage of being a simple means of providing a suction pressure without the expense of providing and running a vacuum box or fan.
- Preferably, the foil is fixed and is located opposite the press-nip of the roll. This has the advantage that the press-nip can activate the foil allowing the suction pressure to be created adjacent the press-nip and thereby remove water flowing laterally from the nip.
- Preferably, activation means is provided in the roll to activate the foil. This can be provided on the roll, if the foil is fixed with respect to the roll, or it can be fixed with regard to the roll if the foil rotates with the roll.
- In accordance with a third aspect of the present invention there is provided a suction roll comprising a perforated hollow drum and a foil within the drum whose activation creates a suction pressure at the perforations.
- Preferably, the suction roll further comprises a suction roll cover provided with through bores each of which connects with a respective shell perforation to provide suction holes in the roll.
- Preferably, the cover also comprises a plurality of blind-drilled holes and/or grooves.
- By way of example only, specific embodiments of the invention will now be described, with reference to the accompanying drawings, in which:-
- Fig. 1 is a partial schematic view illustrating the outer surface of the roll cover constructed in accordance with a first embodiment of the present invention;
- Fig. 2 is a partial section through the roll cover of Fig. 1;
- Fig. 3 is a partial schematic view illustrating the outer surface of the roll cover constructed in accordance with a second embodiment of the present invention;
- Fig. 4 is a partial section through the roll cover of Fig. 3;
- Fig. 5 shows schematically the distribution of suction holes in relation to the blind-drilled holes for the embodiment of Figs. 3 and 4 (the grooves have been omitted for the sake of clarity);
- Fig. 6 is a diagrammatic longitudinal sectional view of a roll provided with the roller cover of Figs. 3 and 4; and
- Figs. 7 and 8 are diagrammatic representations of the suction roll of Figs. 3 and 4 illustrating a variation of the means providing a vacuum source.
-
- In a first embodiment of the present invention illustrated in Figs. 1 and 2, a roll comprises a solid metal drum or
shell 2 clad in a polyurethane shell cover 4. The thickness of the cover is 21 mm and its outermost surface is provided with an equal distribution of blind-drilledholes 6 each having a diameter of 2.4 mm. The blind-drilled holes have a plurality of depths namely, 5, 6 and 6.5 mm. The blind-drilledholes 6 are interconnected by acircumferential groove 8 cut through each blind-drilledhole 6 and whichgroove 8 extends helically about the roll cover surface. The grooves have a semi-circular base to reduce frictional resistance to water flow along them. - In the second embodiment illustrated in Fig. 3 and 4, the roll of the first embodiment is modified in that the
solid metal shell 2 comprises a plurality of equally distributedperforations 10 each having a diameter of 3 mm. The cover is modified in that several of the blind-drilled holes are replaced by an equal distribution of throughbores 12 each having a diameter of 2.4 mm and connecting with arespective perforation 10 to form asuction hole 14. Eachsuction hole 14 is separated from anadjacent suction hole 14 by the interposition of a blind-drilledhole 6, such that eachsuction hole 14 is completely surrounded by an even distribution of blind drilledholes 6 as best illustrated in Fig. 5. - The hollow interior of the suction roll is provided with a standard suction box (not illustrated) to provide a vacuum at the suction holes 14. Alternatively the suction roll could be provided with a source of vacuum as illustrated in Fig. 6 which shows a diagrammatic cross-section of a
roller 16, which comprises a cylindrical roller sleeve 4, end caps 18 andtrunnions Trunnion 20 is solid and serves only as a rotational bearing for theroller 16.Trunnion 22 however has anaxial bore 24 which extends along anaxial shaft 26 of the roller, and the wall of theshaft 26 is pierced by a plurality ofapertures 28 which connect the interior of thebore 24 with the internal volume of theroller 16. A suction device, such as a pump or fan is connected to thebore 24, so as to draw air, and entrained water from the surface of theroller 16, and thus from any wet material resting thereon, through the suction holes 14 andapertures 28. - In a third embodiment of the invention as illustrated in Figs. 7 and 8, the suction roll of the second embodiment is modified in that instead of creating a vacuum by means of a suction box or
trunnion 24, an artificial vacuum is created by means of a fixedfoil 30 in the interior of thesuction roll 16. Referring to Fig. 7paper 42 supported on press felt 34 passes betweensuction roll 16 andtop roll 32 in order to express water from the paper. As theroll 16 rotates the press-nip 36 created between the rolls activates the foil to produce apositive pressure pulse 38 and anegative pressure pulse 40 and thereby creates a vacuum to draw water into the interior of theroll 16 via the suction holes 14. - It is of course to be understood that the invention is not intended to be restricted to the details of the above embodiment which are described by way of example only.
Claims (19)
- A roll cover (4) for a roll (2), comprising an outwardly presented work contacting surface in which is provided a plurality of through bores (12) and a plurality of blind-drilled holes (6), the cross-sectional area of each through bore (12) being substantially the same as that of each blind-drilled hole (6).
- A roll cover as claimed in claim 1, wherein a continuous circumferential groove is provided in said work surface.
- A roll cover as claimed in claim 2, wherein said groove connects the blind-bores and/or through bores.
- A roll cover as claimed in claim 2 or 3, wherein said groove extends helically about the work surface.
- A roll cover as claimed in claim 2, 3 or 4, wherein the groove has a semi-circular base.
- A roll cover as claimed in any one of the preceding claims wherein there is an even distribution of through bores and/or of blind-drilled holes.
- A roll cover as claimed in any one of the preceding claims wherein each through bore is surrounded by an even distribution of blind-drilled holes.
- A roll cover as claimed in any one of the preceding claims wherein each through bore is not immediately adjacent another through bore.
- A roll cover as claimed in any one of the preceding claims wherein the roll cover is provided on a homogeneous hollow shell of a roll.
- A roll cover as claimed in any one of claims 1 to 8, wherein the roll cover is provided on a perforated hollow shell of a roll.
- A roll cover as claimed in claim 10, wherein the through bores in the roll cover are aligned with a respective shell perforation to provide a suction hole in the roll.
- A roll cover as claimed in claim 10 or 11, wherein the cross-sectional area of each shell perforation is greater than the cross-sectional area of each through bore.
- A roll cover as claimed in claim 11 or 12, wherein suction means is provided within the shell to draw water through the suction holes.
- A roll cover as claimed in claim 13, wherein the suction means is an internal foil within the suction roll the activation of which produces a suction pressure with the suction holes.
- A roll cover as claimed in claim 14, wherein in use, the foil is fixed and is located opposite the press-nip of the roll.
- A roll cover as claimed in claim 14 or 15, wherein, activation means is provided in the roll to activate the foil.
- A roll cover (4) for a roll (2), comprising an outwardly presented work-contacting surface which has an even distribution of bores (6, 12) of equal cross-sectional area.
- A roll cover as claimed in claim 17, wherein the bores comprise blind holes and a continuous circumferential groove extends helically in and about the roll cover surface and cuts through each of the blind bores.
- A roll cover as claimed in claim 17 or 18, wherein the bores comprise blind bores of a variety of depths.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GBGB9924646.4A GB9924646D0 (en) | 1999-10-19 | 1999-10-19 | Improvements in roll covers |
GB9924646 | 1999-10-19 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1103654A2 true EP1103654A2 (en) | 2001-05-30 |
EP1103654A3 EP1103654A3 (en) | 2002-06-19 |
EP1103654B1 EP1103654B1 (en) | 2006-06-21 |
Family
ID=10862946
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00309226A Expired - Lifetime EP1103654B1 (en) | 1999-10-19 | 2000-10-19 | Roll |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1103654B1 (en) |
AT (1) | ATE331071T1 (en) |
DE (1) | DE60028908T2 (en) |
GB (1) | GB9924646D0 (en) |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1375742A1 (en) * | 2002-06-21 | 2004-01-02 | Voith Paper Patent GmbH | Method for manufacturing a roll and roll |
DE10327248A1 (en) * | 2003-06-17 | 2005-01-05 | Voith Paper Patent Gmbh | Papermaking assembly has forming drum with a first basic array of holes in a regular pattern and a second array of holes presenting a legend |
DE10341237A1 (en) * | 2003-09-08 | 2005-03-24 | Voith Paper Patent Gmbh | Perforated forming drum for manufacture of paper or carton has thin sleeve with regular or regular surface structure |
EP1754822A2 (en) * | 2005-08-19 | 2007-02-21 | Voith Patent GmbH | Method for operating a pressing arrangement |
WO2010097127A1 (en) * | 2009-02-25 | 2010-09-02 | Voith Patent Gmbh | Roller |
WO2011027031A1 (en) | 2009-09-03 | 2011-03-10 | Metso Paper, Inc. | Roll shell and roll |
DE102012200461A1 (en) | 2012-01-13 | 2013-07-18 | Voith Patent Gmbh | Roller cover for roller in web manufacturing or processing machine, has circumferential grooves and multiple holes formed as blind holes or suction holes, where cross section of circumferential grooves and blind holes has continuous profile |
EP2462279B1 (en) | 2009-08-04 | 2016-08-31 | Voith Patent GmbH | Combination of a press felt with a pressure roller covering and/or a suction roller covering for a paper machine |
CN108660847A (en) * | 2018-05-15 | 2018-10-16 | 浙江永鑫特种纸有限公司 | Crimped paper paper machine and papermaking process |
CN108699771A (en) * | 2016-04-26 | 2018-10-23 | 斯托·伍德沃德许可有限责任公司 | Vacuum furnace with the through-hole and blind drilling pattern that improve basal plane distance |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2013037527A2 (en) | 2011-09-16 | 2013-03-21 | Voith Patent Gmbh | Combination of a roll cover or shoe press sleeve with a paper machine covering and use of such a combination |
DE102011086961A1 (en) | 2011-11-23 | 2013-05-23 | Voith Patent Gmbh | Combined type roll cover and shoe press sleeve for machine producing or finishing fiber web e.g. paper, sets angular difference between angle of the groove and angle of the load-bearing structure to specific value |
DE102011084980A1 (en) | 2011-10-21 | 2013-04-25 | Voith Patent Gmbh | roller |
DE202014003311U1 (en) | 2014-04-22 | 2014-05-06 | Voith Patent Gmbh | roller |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3880711A (en) * | 1973-09-12 | 1975-04-29 | Jr Millard F Hayes | Vacuum cylinder assembly having angled, tear-shaped, sieve supporting foils |
US4366025A (en) * | 1981-06-04 | 1982-12-28 | Beloit Corporation | Suction press roll |
EP0241389A1 (en) * | 1986-04-01 | 1987-10-14 | GERLAND STOWE WOODWARD INDUSTRIES BV Société en nom collectif dite : | Pressure roll, particularly for extracting liquid from a sheet material, such as a continuous web of paperstock, and press comprising such a roll |
DE19722638A1 (en) * | 1997-05-30 | 1998-12-03 | Voith Sulzer Papiermasch Gmbh | Press jacket for a press device |
WO1999032713A1 (en) * | 1997-12-10 | 1999-07-01 | Valmet Corporation | Roll for a paper or board machine |
-
1999
- 1999-10-19 GB GBGB9924646.4A patent/GB9924646D0/en not_active Ceased
-
2000
- 2000-10-19 AT AT00309226T patent/ATE331071T1/en active
- 2000-10-19 DE DE60028908T patent/DE60028908T2/en not_active Expired - Lifetime
- 2000-10-19 EP EP00309226A patent/EP1103654B1/en not_active Expired - Lifetime
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3880711A (en) * | 1973-09-12 | 1975-04-29 | Jr Millard F Hayes | Vacuum cylinder assembly having angled, tear-shaped, sieve supporting foils |
US4366025A (en) * | 1981-06-04 | 1982-12-28 | Beloit Corporation | Suction press roll |
EP0241389A1 (en) * | 1986-04-01 | 1987-10-14 | GERLAND STOWE WOODWARD INDUSTRIES BV Société en nom collectif dite : | Pressure roll, particularly for extracting liquid from a sheet material, such as a continuous web of paperstock, and press comprising such a roll |
DE19722638A1 (en) * | 1997-05-30 | 1998-12-03 | Voith Sulzer Papiermasch Gmbh | Press jacket for a press device |
WO1999032713A1 (en) * | 1997-12-10 | 1999-07-01 | Valmet Corporation | Roll for a paper or board machine |
Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1375742A1 (en) * | 2002-06-21 | 2004-01-02 | Voith Paper Patent GmbH | Method for manufacturing a roll and roll |
DE10327248A1 (en) * | 2003-06-17 | 2005-01-05 | Voith Paper Patent Gmbh | Papermaking assembly has forming drum with a first basic array of holes in a regular pattern and a second array of holes presenting a legend |
DE10341237A1 (en) * | 2003-09-08 | 2005-03-24 | Voith Paper Patent Gmbh | Perforated forming drum for manufacture of paper or carton has thin sleeve with regular or regular surface structure |
EP1754822A2 (en) * | 2005-08-19 | 2007-02-21 | Voith Patent GmbH | Method for operating a pressing arrangement |
EP1754822A3 (en) * | 2005-08-19 | 2011-11-30 | Voith Patent GmbH | Method for operating a pressing arrangement |
WO2010097127A1 (en) * | 2009-02-25 | 2010-09-02 | Voith Patent Gmbh | Roller |
EP2462279B1 (en) | 2009-08-04 | 2016-08-31 | Voith Patent GmbH | Combination of a press felt with a pressure roller covering and/or a suction roller covering for a paper machine |
WO2011027031A1 (en) | 2009-09-03 | 2011-03-10 | Metso Paper, Inc. | Roll shell and roll |
DE112010003537T5 (en) | 2009-09-03 | 2012-08-30 | Metso Paper, Inc. | ROLLER COAT AND ROLLER |
DE102012200461A1 (en) | 2012-01-13 | 2013-07-18 | Voith Patent Gmbh | Roller cover for roller in web manufacturing or processing machine, has circumferential grooves and multiple holes formed as blind holes or suction holes, where cross section of circumferential grooves and blind holes has continuous profile |
CN108699771A (en) * | 2016-04-26 | 2018-10-23 | 斯托·伍德沃德许可有限责任公司 | Vacuum furnace with the through-hole and blind drilling pattern that improve basal plane distance |
CN108660847A (en) * | 2018-05-15 | 2018-10-16 | 浙江永鑫特种纸有限公司 | Crimped paper paper machine and papermaking process |
Also Published As
Publication number | Publication date |
---|---|
GB9924646D0 (en) | 1999-12-22 |
EP1103654B1 (en) | 2006-06-21 |
DE60028908D1 (en) | 2006-08-03 |
EP1103654A3 (en) | 2002-06-19 |
DE60028908T2 (en) | 2007-02-15 |
ATE331071T1 (en) | 2006-07-15 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP1103654B1 (en) | Roll | |
FI71369B (en) | LAONGNYPPRESS FOER PAPER MASK | |
JPS5926717B2 (en) | Suction press roll device of paper machine | |
DE3416423A1 (en) | PAPER MACHINE PRESS ROLLER, WHICH IS PROVIDED WITH AN ELASTIC LAYER, AND PAPER MACHINE PRESS, IN WHICH THE PRESS PRESS ROLLER IS INSERTED | |
US6402896B1 (en) | Roll for a paper or board machine | |
US3198694A (en) | Press roll assemblies in paper making machine | |
DE2741144A1 (en) | METHOD FOR APPLYING A VACUUM PRESSURE TO A FELT, SCREEN OR FIBER SUSPENSION LAYER OF A PAPER MACHINE AND DEVICE FOR CARRYING OUT THE METHOD | |
US3198697A (en) | Paper press roll assemblies | |
JP2001520330A5 (en) | ||
JPH07502080A (en) | press shoe | |
US3198693A (en) | Scavenging means for grooved press rolls | |
DE102011084980A1 (en) | roller | |
EP0033293B1 (en) | Extended nip press | |
US3447451A (en) | Press cylinder for paper machines and pulp drying machine | |
HU227785B1 (en) | A press apparatus for removing water from a web | |
US6228221B1 (en) | Dewatering press and process | |
FI98079C (en) | Paper machine suction roller suction box | |
EP1496152A1 (en) | Press roller or a roller sleeve | |
JP4331315B2 (en) | Compression jacket | |
EP0639667A1 (en) | Apparatus for a paper/board machine and use of the same | |
GB2099470A (en) | Wet presses for papermaking machines | |
US6660161B2 (en) | Dewatering device | |
US6716315B2 (en) | Water draining device | |
DE102010028917A1 (en) | Press sleeve for press roll of shoe press for dewatering e.g. paper, has recesses formed as blind elongated holes, where base surface of elongated holes is formed in longitudinal and transverse directions in planar manner | |
DE102005046323A1 (en) | Shoe press for dewatering a traveling wet web, e.g. of paper or board, comprises a counterroller whose shell has axial holes that are open to the outer surface of the shell, suction being applied to the shell |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
AK | Designated contracting states |
Kind code of ref document: A2 Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE |
|
AX | Request for extension of the european patent |
Free format text: AL;LT;LV;MK;RO;SI |
|
PUAL | Search report despatched |
Free format text: ORIGINAL CODE: 0009013 |
|
AK | Designated contracting states |
Kind code of ref document: A3 Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE |
|
AX | Request for extension of the european patent |
Free format text: AL;LT;LV;MK;RO;SI |
|
17P | Request for examination filed |
Effective date: 20020719 |
|
AKX | Designation fees paid |
Designated state(s): AT DE FI SE |
|
17Q | First examination report despatched |
Effective date: 20030403 |
|
RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: VOITH PAPER PATENT GMBH |
|
RTI1 | Title (correction) |
Free format text: ROLL COVER |
|
GRAP | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOSNIGR1 |
|
RTI1 | Title (correction) |
Free format text: ROLL |
|
GRAS | Grant fee paid |
Free format text: ORIGINAL CODE: EPIDOSNIGR3 |
|
GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): AT DE FI SE |
|
REF | Corresponds to: |
Ref document number: 60028908 Country of ref document: DE Date of ref document: 20060803 Kind code of ref document: P |
|
RAP2 | Party data changed (patent owner data changed or rights of a patent transferred) |
Owner name: VOITH PATENT GMBH |
|
REG | Reference to a national code |
Ref country code: SE Ref legal event code: TRGR |
|
PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |
|
26N | No opposition filed |
Effective date: 20070322 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: SE Payment date: 20091014 Year of fee payment: 10 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: AT Payment date: 20101014 Year of fee payment: 11 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: DE Payment date: 20101022 Year of fee payment: 11 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: SE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20101020 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: FI Payment date: 20111013 Year of fee payment: 12 |
|
REG | Reference to a national code |
Ref country code: AT Ref legal event code: MM01 Ref document number: 331071 Country of ref document: AT Kind code of ref document: T Effective date: 20121019 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: AT Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20121019 Ref country code: DE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20130501 |
|
REG | Reference to a national code |
Ref country code: DE Ref legal event code: R119 Ref document number: 60028908 Country of ref document: DE Effective date: 20130501 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: FI Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20121019 |