EP1893805A1 - Langspaltpresse - Google Patents
LangspaltpresseInfo
- Publication number
- EP1893805A1 EP1893805A1 EP06743206A EP06743206A EP1893805A1 EP 1893805 A1 EP1893805 A1 EP 1893805A1 EP 06743206 A EP06743206 A EP 06743206A EP 06743206 A EP06743206 A EP 06743206A EP 1893805 A1 EP1893805 A1 EP 1893805A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- press
- roll
- nip
- less
- diameter
- 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
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 invention relates to an extended-nip press for dewatering a paper, board, tissue or another fibrous web in a machine for producing and / or finishing the same, consisting of a press roll with a flexible roll shell and a pressing element with a concave pressing surface which the roll shell for Forming an extended press nip presses to a cylindrical counter roll, wherein the diameter of the press roll is less than 1 m.
- Such presses are often used in conversions and can replace conventional presses because of the small space required.
- the object of the invention is therefore to avoid the burden of the flexible roll shell with the smallest possible space requirement of the press arrangement.
- this object is achieved in that the diameter of the counter roll is more than 0.8 m and the ratio between the length of the pressing surface in the web running direction and the diameter of the press roll is less than 0.25 and / or the press roll at most 0.6 m wider than the counter roll is.
- the relatively large diameter of the counter roll has a reduced curvature of the pressing surface and thus a lower load on the flexible roll shell result.
- This makes it possible to increase the pressing surface of the pressing elements so far that the realization of higher pressing pulses is possible without making a larger diameter of the roll shell required.
- the load on the roll shell of the press roll as a result of the deformation in the press nip area is further reduced if the diameter of the press roll is smaller than the diameter of the counter roll, as a result results in a lower convex curvature of the press nip in the web running direction.
- the average pressing pressure in the press nip should be greater than 2 MPa, preferably greater than 3 MPA and in particular greater than 4 MPa.
- the pressing surface in the web running direction has a length of up to 80 mm, preferably of up to 100 mm and in particular of to 140 mm.
- the pressing surface in the web running direction has a length of up to 160 mm, preferably up to 190 mm and in particular up to 230 mm.
- the advantages of the invention are obtained especially in presses in which the width of the press roll is less than 7.5 m, preferably less than 6.8 m and in particular less than 5.5 m ,
- the press roll i. its roll mantle may only be at most 0.5 m, preferably at most 0.4 m wider than the mating roll, i. whose lateral surface must be.
- FIG. 1 shows a schematic cross section through an extended-nip press
- FIG. 2 shows a side view of the extended nip press
- FIG. 3 shows a representation of the pressure-pressure profile in the extended nip.
- the extended press nip for dewatering a fibrous web 1, in particular a paper web in a paper machine, is formed by a cylindrical counter-roller 5 and a press roller 4 arranged above it.
- the roller axles are mounted on both sides in a roller frame 10. - A -
- the fibrous web 1 passes through the press nip here by way of example together with a respective dewatering belt 2, 3 in the form of a press felt on both sides.
- These drainage belts 2, 3 take up a large part of the water pressed in the press nip from the fibrous web 1 and transport it out of the press nip.
- the press roll 4 has a flexible roll shell 9 made of fiber-reinforced plastic, which is pressed by a hydraulic pressing element 6 with a concave pressing surface to the counter roll 5.
- the pressing member 6 is formed as an axially extending press shoe.
- the counter roll 5 has a diameter of 1 m.
- the pressing surface of the pressing element 6 has in the web running direction 11 has a length L of about 160 mm, so that the ratio between this length L and the diameter of the press roll 4 is 0.2.
- the thus-dimensioned extended-nip press is a very compact press unit and is therefore ideal for the replacement of conventional press units with a short press nip.
- the axis of rotation 8 of the roll mantle 9 of the press roll 4 is offset by an amount a against the web running direction 11 to the press plane 7 passing through the supports of the press roll 4 and the mating roll 5.
- the pressing pressure at the inlet of the press nip should gradually rise to a maximum and then drop suddenly from there to the outlet.
- the width of the press roll 4 is about 6.5 m, which has a low deflection of the backing roll 5 result.
- the roll mantle 9 Since the ends of the flexible roll mantle 9 of the press roll 4 are supported by cylindrical side windows 12, the roll mantle 9 requires a transition region from the concave shape of the press nip to the circular shape of the side window 12 shown in FIG.
- This transition is also referred to as guy length h, I 2 and corresponds to the length by which the roll shell 9 of the press roll 4 projects axially beyond the mantle surface of the counter roll 5.
- This guy length li, I 2 can be the same or different lengths.
- the press roller 4 projects beyond the counter roller 5 on both sides by the same length U, l 2 of approximately 25 cm, so that the press roller 4 is 0.5 m longer than the counter roller 5.
Landscapes
- Paper (AREA)
- Polarising Elements (AREA)
- Glass Compositions (AREA)
- Nonmetallic Welding Materials (AREA)
- Sealing Material Composition (AREA)
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PL06743206T PL1893805T3 (pl) | 2005-04-30 | 2006-03-15 | Prasa z wydłużoną szczeliną |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102005020220A DE102005020220A1 (de) | 2005-04-30 | 2005-04-30 | Langspaltpresse |
PCT/EP2006/060720 WO2006117261A1 (de) | 2005-04-30 | 2006-03-15 | Langspaltpresse |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1893805A1 true EP1893805A1 (de) | 2008-03-05 |
EP1893805B1 EP1893805B1 (de) | 2009-10-28 |
Family
ID=36499333
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP06743206A Not-in-force EP1893805B1 (de) | 2005-04-30 | 2006-03-15 | Langspaltpresse |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP1893805B1 (de) |
JP (1) | JP4935810B2 (de) |
AT (1) | ATE447071T1 (de) |
DE (2) | DE102005020220A1 (de) |
PL (1) | PL1893805T3 (de) |
WO (1) | WO2006117261A1 (de) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2595910A1 (de) * | 2010-07-23 | 2013-05-29 | Inventio AG | Zerstoerungsfreies pruefen eines tragelements einer aufzugsanlage |
DE102012005319A1 (de) | 2012-03-19 | 2013-09-19 | L'orange Gmbh | Injektorbaugruppe |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19702575A1 (de) * | 1997-01-24 | 1998-07-30 | Voith Sulzer Papiermasch Gmbh | Maschine zur Herstellung einer Faserstoffbahn |
DE19705360A1 (de) * | 1997-02-12 | 1998-08-13 | Voith Sulzer Papiermasch Gmbh | Preßvorrichtung zum Entwässern oder Glätten einer Faserstoffbahn |
US6752908B2 (en) * | 2001-06-01 | 2004-06-22 | Stowe Woodward, Llc | Shoe press belt with system for detecting operational parameters |
EP1608925B1 (de) * | 2003-03-31 | 2011-09-14 | PMT Italia S.p.A. | Pressvorrichtung zur entwässerung einer papierbahn |
-
2005
- 2005-04-30 DE DE102005020220A patent/DE102005020220A1/de not_active Withdrawn
-
2006
- 2006-03-15 AT AT06743206T patent/ATE447071T1/de active
- 2006-03-15 PL PL06743206T patent/PL1893805T3/pl unknown
- 2006-03-15 EP EP06743206A patent/EP1893805B1/de not_active Not-in-force
- 2006-03-15 DE DE502006005253T patent/DE502006005253D1/de active Active
- 2006-03-15 JP JP2008508178A patent/JP4935810B2/ja not_active Expired - Fee Related
- 2006-03-15 WO PCT/EP2006/060720 patent/WO2006117261A1/de not_active Application Discontinuation
Non-Patent Citations (1)
Title |
---|
See references of WO2006117261A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE102005020220A1 (de) | 2006-11-09 |
DE502006005253D1 (de) | 2009-12-10 |
ATE447071T1 (de) | 2009-11-15 |
JP4935810B2 (ja) | 2012-05-23 |
WO2006117261A1 (de) | 2006-11-09 |
PL1893805T3 (pl) | 2010-03-31 |
JP2008540852A (ja) | 2008-11-20 |
EP1893805B1 (de) | 2009-10-28 |
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