EP1238148B1 - Press device having an extended press nip for pressing a traveling paper or board web - Google Patents
Press device having an extended press nip for pressing a traveling paper or board web Download PDFInfo
- Publication number
- EP1238148B1 EP1238148B1 EP00983448A EP00983448A EP1238148B1 EP 1238148 B1 EP1238148 B1 EP 1238148B1 EP 00983448 A EP00983448 A EP 00983448A EP 00983448 A EP00983448 A EP 00983448A EP 1238148 B1 EP1238148 B1 EP 1238148B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cylinder
- press
- shoe
- length
- press device
- 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.)
- Expired - Lifetime
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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
- D21F3/0209—Wet presses with extended press nip
- D21F3/0218—Shoe presses
Definitions
- the press device according to the invention particularly advantageously can be utilised for wet-pressing of moist paper or paperboard webs, but also for calendering or other finishing of dried paper or paperboard.
- the press device according to the invention can also be utilised for other fibre webs than paper and paperboard.
- the patent publication US 4,917,768 discloses a previously known shoe press device in which the press shoe is supported via tubular sleeves rigidly affixed to and spaced apart on a support in a direction across the machine direction. Thereby, the sleeves are received in cylindrical recesses in the press shoe in order to allow the press shoe to move toward or from a counter roll and the nip pressure to be varied.
- the disclosed shoe press comprises hydraulic jacks upstream and downstream the sleeves for forcing the press shoe against the counter roll and for pivoting the shoe around an axis across the machine in order to vary the nip pressure in the machine direction.
- the two-part member consists of first and second cylinders, while the coupler comprises a piston which is slidably received in the two cylinders.
- the two-part member instead comprises first and second pistons, while the coupler comprises a cylinder which surrounds both pistons.
- the press shoe In order to control the conditions in the nip of a shoe press, such as the pressure profile (curve) through the nip, it is usually desirable to be able to move to the press shoe forward or backwards in the machine direction in order to be able to influence the pressure profile through the nip so that the nip pressure is highest in the beginning and lower in the end of the nip, or vice versa.
- the press shoe in principle, will follow an arc-shaped path with its centre in the central axis of the counter roll. This may result in a skewness in the machine direction between the parts included in the loading cylinders, i.e.
- the first object of the present invention is to provide a press device having an extended nip for pressing a running paper or paperboard web in which the press shoe unintentionally or intentionally can be tilted/pivoted around an imaginary axis across the machine direction with minimum skewness between the parts included in the loading cylinders, and without generating any excessively large forces directed towards a possible shoe support or the press shoe becoming unstable if the forces are directed against the machine direction (away from a possible shoe support).
- this first object of the present invention is achieved by means of a press device comprising a press shoe aligned across the machine direction arranged for forming an extended nip in cooperation with a backing member for passage of the web during the pressing, a support which supports the press shoe in a movable way in a direction toward the backing member via aplurality of loading cylinders spaced apart along the press shoe for enabling application of pressure on the web during the pressing.
- Each of the loading cylinders comprises a first cylinder member having a first cylinder end which is attached to or integrated in the press shoe, and a second cylinder member having a second cylinder end which is attached to or integrated in the support, which first and second cylinder members are slidably connectedby a connecting member.
- Each of the above-mentioned loading cylinders 106 comprises a first cylinder member 107 having a first cylinder end 108 which is attached to or integrated in the press shoe 101, and a second cylinder member 109 having a second cylinder end 110 which is attached to or integrated in the support 105.
- the first and second cylinder members 107, 109 are slidably connected by a connecting member 111, wherein the connecting member 111 and the first cylinder member 107 are movable in relation to each other with a first length of stroke L1, while the connecting member 111 and the second cylinder member 109 are movable in relation to each other with a second length of stroke L2, and the connecting member has a third length L3.
- length of stroke should be understood as the maximum length of a cylinder member available for sliding displacement of a second, cooperating member in relation to said cylinder member.
- the first length of stroke L1 is less than half of the second length of stroke L2.
- connection is arranged in such a way that a central axis C1 of the first cylinder member 107 and a central axis C3 of the connecting member 111 can be tilted to an angle in relation to each other and to a central axis C2 of the second 109 cylinder member during an intentional or unintentional tilting of the press shoe 101 during the pressing.
- first L1 and second L2 lengths of stroke, the third length L3, and the geometrical positions of the contacting seals 112,113 are adapted in order to minimise the angle A2 between the central axis C3 of the connecting member and the central axis C2 of the second cylinder member during the tilting.
- the above-mentioned tilting either can be intentional or unintentional.
- the seals 112, 113 can advantageously be of the type disclosed in the above-discussed EP 0 933 471.
- the connecting member can have different geometrical shapes.
- the backing member 102 is a rotatable counter roll
- a flexible belt 118 is arranged in an endless loop for running between the press shoe 101 and the paper or paperboard web 104 during the pressing.
- the flexible belt preferably has the shape of a sleeve.
- the press device having an extended nip according to the invention preferably is intended for wet-pressing, or for calendering a paper or paperboard web.
- Fig. 1A shows a shoe press device with its press shoe in a first position, intended to generate a substantially symmetrical pressure curve through the nip.
- the intentional displacement of the press shoe 1 into the second position shown in Fig. 1B is intended to displace the pressure maximum of the pressure curve towards the end of the nip, wherein the press shoe 1 and, consequently, the central axis c1 of the therewith associated first cylinder member 7 will be tilted forwards in the machine direction MD to an angle a1 in relation to the central axis c2 of the second cylinder member 9.
- the angles shown in the drawings for reasons of clarity, have been exaggerated.
- Figs. 2A and 2B instead illustrate a press device having an extended nip according to a preferred embodiment of the invention.
- Fig. 2A shows the press device with its press shoe in a first position similar to the first position in Fig. 1A
- Fig. 2B shows the press device with its press shoe intentionally moved into a second position similar to the second position in Fig. 1B.
- the press shoe 101 has been intentionally tilted approximately as much as the press shoe 1 in Fig. 1B in order to make it possible to obtain a higher nip pressure in the end of the nip than in its beginning. Accordingly, the angle A1 between the central axis C1 of the first cylinder member 107 and the central axis C2 of the second cylinder member 109 is approximately as large as the angle a1 in Fig. 1B.
- the angle A2 between the central axis C3 of the connecting member 111 and the central axis C2 of the second cylinder member 109 now becomes significantly smaller than the corresponding angle a2 between the central axes c2 and c3 in Fig. 1B.
- the minimization, i.e. reduction or even elimination, of the angle A2 which is achieved by means of the present invention reduces or even eliminates the force components in the machine direction MD, originating from pressurisation of the working chamber 114, which are exercised by the press shoe 101 on the shoe support 118.
Landscapes
- Paper (AREA)
- Advancing Webs (AREA)
- Machines For Manufacturing Corrugated Board In Mechanical Paper-Making Processes (AREA)
Abstract
Description
Claims (14)
- A press device having an extended nip for pressing a running paper or paperboard web, comprising a press shoe (101) aligned across the machine direction (MD) arranged for forming an extended nip (103) in cooperation with a backing member (102) for passage of said web (104) during the pressing, a support (105) which supports the press shoe in a movable way in a direction toward the backing member via a plurality of loading cylinders (106) spaced apart along the press shoe (101) for enabling application of pressure on the web during the pressing, wherein each of said loading cylinders (106) comprises a first cylinder member (107) having a first cylinder end (108) which is attached to or integrated in the press shoe (101), and a second cylinder member (109) having a second cylinder end (110) which is attached to or integrated in the support (105), which first and second cylinder members (107, 109) are slidably connected by a connecting member (111), wherein the connecting member (111) and the first cylinder member (107) are movable in relation to each other with a first length of stroke (L1), while the coupling member (111) and the second cylinder member (109) are movable in relation to each other with a second length of stroke (L2), and the connecting member has a third length (L3), characterised in that the first length of stroke (L1) is smaller than the second length of stroke (L2).
- A press device having an extended nip according to claim 1, characterised in that the first length of stroke (L1) is less than half of the second length of stroke (L2).
- A press device having an extended nip according to claim 1 or 2, characterised in that the third length (L3) is larger than both the first (L1) and the second (L2) length of stroke.
- A press device having an extended nip according to any one of the preceding claims, characterised in that the third length (L3) is larger than the first (L1) and the second (L2) length of stroke together.
- A press device having an extended nip according to any one of the preceding claims, wherein the connecting member (111) slidably connects the first (107) and the second (109) cylinder members in a sealed way by means of contacting seals (112, 113) in order to form at least one working chamber (114) within which the pressure of a pressurizing medium can be reduced in order to generate a shortening or increased in order to generate a lengthening of the loading cylinder (106), and in such a way that a central axis (C1) of the first cylinder member (107) and a central axis (C3) of the connecting member (111) can be tilted to an angle in relation to each other and to a central axis (C2) of the second (109) cylinder member during an intentional or unintentional tilting of the press shoe (101) during the pressing, characterised in that the first (L1) and second (L2) lengths of strokes, the third length (L3), and the geometrical positions of the contacting seals (112, 113) are adapted in order to minimise the angle (A2) between the central axis (C3) of the connecting member and the central axis (C2) of the second cylinder member during said tilting.
- A press device having an extended nip according to any one of the preceding claims, wherein a shoe support (115) is fixated to the support for receiving forces in the machine direction (MD) exercised by the press shoe (101) in contact with the shoe support during the pressing, characterised in that one or several stopping means (116) are arranged on the first cylinder member (107) and/or on the connecting member (111) in order to restrict a maximum value of the first length of stroke (L1).
- A press device having an extended nip according to claim 5 or 6, characterised in that the first cylinder member (107) comprises an open third cylinder end (116) opposite said first cylinder end (108) and the second cylinder member (109) comprises an open fourth cylinder end (117) opposite said second cylinder end (110), wherein the third (116) and fourth cylinder ends (117) enclose a respective end of said connecting member (111) in order to form the working chamber (114) or several working chambers.
- A press device having an extended nip according to claim 7, characterised in that the connecting member (111) is a substantially cylindrical sleeve, the interior of which constituting a portion of the working chamber (114).
- A press device having an extended nip according to claim 7, characterised in that the connecting member is a solid, substantially cylindrical body at both ends of which a working chamber is formed.
- A press device having an extended nip according to claim 9, characterised in that the cylindrical body comprises one or several channels between the two ends for pressure connection between the working chambers.
- A press device having an extended nip according to claim 5 or 6, characterised in that the first and second cylinder members are solid, substantially cylindrical bodies one end of which being enclosed by the connecting member in order to form the working chamber, wherein said sealing means are arranged on said connecting member.
- A press device having an extended nip according to any one of the preceding claims, characterised in that the backing member (102) is a rotatable counter roll, wherein a flexible belt (118), preferably in the form of a sleeve, is arranged in an endless loop for running between the press shoe (101) and the paper or paperboard web (104) during the pressing.
- Use of a press device having an extended nip according to any one of claims 1 to 12 for wet-pressing of a paper or paperboard web.
- Use of a press device having an extended nip according to any one of claims 1 to 12 for calendering of a paper or paperboard web.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE9904537A SE515484C2 (en) | 1999-12-10 | 1999-12-10 | Pressing device with extended press nip for pressing a running paper or cardboard web |
SE9904537 | 1999-12-10 | ||
PCT/IB2000/001997 WO2001042559A1 (en) | 1999-12-10 | 2000-12-07 | Press device having an extended press nip for pressing a traveling paperboard web |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1238148A1 EP1238148A1 (en) | 2002-09-11 |
EP1238148B1 true EP1238148B1 (en) | 2005-03-23 |
Family
ID=20418088
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00983448A Expired - Lifetime EP1238148B1 (en) | 1999-12-10 | 2000-12-07 | Press device having an extended press nip for pressing a traveling paper or board web |
Country Status (9)
Country | Link |
---|---|
EP (1) | EP1238148B1 (en) |
JP (1) | JP4838473B2 (en) |
CN (1) | CN1181245C (en) |
AT (1) | ATE291660T1 (en) |
AU (1) | AU2020201A (en) |
CA (1) | CA2392520C (en) |
DE (1) | DE60018970T2 (en) |
SE (1) | SE515484C2 (en) |
WO (1) | WO2001042559A1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FI118088B (en) * | 2004-02-19 | 2007-06-29 | Vaahto Oy | Shoe press loading device |
FI126727B (en) * | 2012-10-19 | 2017-04-28 | Valmet Technologies Inc | Shoe reel, long nip press and fiber web machine |
IT202000020926A1 (en) * | 2020-09-03 | 2022-03-03 | A Celli Paper Spa | PAPER SHOE PRESS AND RELATED METHOD |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AT360831B (en) * | 1977-12-20 | 1981-02-10 | Escher Wyss Ag | HYDRAULIC SUPPORT ELEMENT |
CH659865A5 (en) * | 1982-07-30 | 1987-02-27 | Escher Wyss Ag | HYDROSTATIC SUPPORT ELEMENT AND ITS USE IN A ROLLING DEVICE. |
SE461171C (en) * | 1988-05-25 | 1992-08-17 | Valmet Paper Machinery Inc | LONG NYP PRESSES BEFORE PAPER OR CARTON MACHINERY |
FI87484C (en) * | 1988-12-15 | 1993-01-11 | Valmet Paper Machinery Inc | Support arrangement for bend-compensated drum |
DE29900914U1 (en) * | 1998-01-30 | 1999-12-23 | Valmet Corp | Shoe press |
-
1999
- 1999-12-10 SE SE9904537A patent/SE515484C2/en not_active IP Right Cessation
-
2000
- 2000-12-07 AU AU20202/01A patent/AU2020201A/en not_active Abandoned
- 2000-12-07 JP JP2001544423A patent/JP4838473B2/en not_active Expired - Fee Related
- 2000-12-07 DE DE60018970T patent/DE60018970T2/en not_active Expired - Lifetime
- 2000-12-07 WO PCT/IB2000/001997 patent/WO2001042559A1/en active Search and Examination
- 2000-12-07 AT AT00983448T patent/ATE291660T1/en not_active IP Right Cessation
- 2000-12-07 EP EP00983448A patent/EP1238148B1/en not_active Expired - Lifetime
- 2000-12-07 CN CNB00816942XA patent/CN1181245C/en not_active Expired - Lifetime
- 2000-12-07 CA CA002392520A patent/CA2392520C/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
SE9904537L (en) | 2001-06-11 |
WO2001042559A9 (en) | 2002-11-28 |
DE60018970D1 (en) | 2005-04-28 |
CN1181245C (en) | 2004-12-22 |
WO2001042559A1 (en) | 2001-06-14 |
EP1238148A1 (en) | 2002-09-11 |
SE515484C2 (en) | 2001-08-13 |
JP2003516482A (en) | 2003-05-13 |
CA2392520A1 (en) | 2001-06-14 |
SE9904537D0 (en) | 1999-12-10 |
ATE291660T1 (en) | 2005-04-15 |
CN1409785A (en) | 2003-04-09 |
CA2392520C (en) | 2009-02-10 |
AU2020201A (en) | 2001-06-18 |
DE60018970T2 (en) | 2006-01-19 |
JP4838473B2 (en) | 2011-12-14 |
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