EP3408443A1 - Pressenpartie - Google Patents
PressenpartieInfo
- Publication number
- EP3408443A1 EP3408443A1 EP16810374.5A EP16810374A EP3408443A1 EP 3408443 A1 EP3408443 A1 EP 3408443A1 EP 16810374 A EP16810374 A EP 16810374A EP 3408443 A1 EP3408443 A1 EP 3408443A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- press
- section according
- fibrous web
- press section
- guide
- 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
- 238000000926 separation method Methods 0.000 description 5
- 238000001035 drying Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
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
- D21F3/04—Arrangements thereof
- D21F3/045—Arrangements thereof including at least one extended press nip
Definitions
- the invention relates to a press section of a machine for producing a fibrous web, in particular a paper, board or tissue web with two in the web running direction one behind the other and formed by two pressing elements press nips, wherein each pressing element at least a separate, endlessly rotating press belt in each case via a plurality of guide rollers is guided, the fibrous web after the press nips in each case via a guide track runs together with two opposing press belts and after each following a press nip guide a press belt is led away from the fibrous web, while the opposite press belt runs along with the fibrous web on a suction element.
- a press of the type mentioned above is known for example from DE 10 201 1 082 161 A1.
- the press section described therein comprises a plurality of press gaps, each with two strip-shaped, endlessly circulating coverings in the form of an underfelt and an upper felt, which are guided over a plurality of guide rollers.
- an evacuated guide roller of the lower felt serves u.a. to keep the fibrous web at the separation point on the underfelt.
- Such an evacuated guide roll is also referred to as Saugfilzleitwalze.
- Saugfilzleitwalzen are used in particular above web speeds of 1 100 m / min to 1200 m / min, since the web separation as described above with a cheaper vacuum cleaner is no longer possible. Saugfilzleitwalzen offer the advantage of a very safe web separation up to high speeds, but are very expensive in terms of investment costs, spare parts and operating costs.
- a conventional Saugfilzleitwalze is usually carried out in two or more zonig, which is why a relatively expensive suction head is necessary for the extraction.
- a conventional Saugfilzleitwalze also requires a rotary drive, since it is frictional and consumes even drive power in the felt loop. The drive prevents the felt tension from falling too much directly after the press nip, which can otherwise lead to web disturbances.
- the rotary actuator When the rotary drive of the Saugfilzleitwalze is provided together with the suction on a drive side of the press, the rotary actuator must be performed usually eccentrically with a gear. Alternatively, the rotary drive can be performed centric on the drive side, but then usually the suction is expensive to move to a leader page of the press.
- the invention has for its object to achieve a secure web run in such press sections with the least possible effort.
- the object has been achieved in that the suction element is formed after the first press nip of a rotating, suctioned guide roll and after the second press nip of a fixed suction box.
- the evacuated guide roller ensures safe web guidance after the first press nip.
- the moisture content of the fibrous web is already so far reduced in such press sections and in particular in packaging papers with average to heavy basis weights of up to 250g / m 2 even at machine speeds of over 1 100 m / min and thus increased the strength of the fibrous web so far in that in order to stabilize the web run when the press belt is guided away, the use of a cost-effective stationary suction box is sufficient.
- the length of a guide path from the respective suction element to a following in the fibrous web passage Abdgingsaugwalze for transferring the fibrous web from one covering to another covering a maximum of 600 mm to a maximum of 1000 mm.
- the evacuated guide roll In order not to allow the tension of the press belt, which wraps around the evacuated guide roll, to drop too much after the first press nip, the evacuated guide roll should have its own drive. Since the evacuated guide roll itself consumes drive power due to friction, it is advantageous if the drive of the evacuated guide roll at least 15%, preferably at least 20% and in particular applies at least 25% of the total drive power of the respective press nip.
- a suction head of the evacuated guide roll can thus be designed simpler.
- drive power can be applied by a, after a suction element of the corresponding press belt looped guide roller with its own drive.
- the wrap angle of the guide roller with its own drive should be greater than 60 °, preferably greater than 80 ° and in particular greater than 90 °.
- the drive of the guide roller at least 15%, preferably at least 20% and in particular apply at least 25% of the total drive power of the respective press nip.
- the rotary drive of the suctioned guide roller downstream of the guide roller is torque-controlled, whereas a rotary drive on the press nip is speed-controlled.
- the evacuated guide roll should have several suction zones, of which at least one zone is a high vacuum zone with a vacuum of at least 35 kPa to at least 50 kPa.
- the suction box should have several, preferably between 3 and 5 suction slots.
- the fibrous web runs in front of at least one, preferably two press nips in each case via a guide path together with two opposing press belts.
- the two-sided guidance of the fibrous web in the guide track is safe and stable even at high speeds and prevents damage to the fibrous web.
- At least one press nip should be made longer and preferably have a pressing pressure of> 1000 kN / m and / or a press nip length of> 250 mm.
- the press nip formation is particularly simple when the press elements are formed by press rolls.
- the press belts should be designed as water-absorbing press felts.
- At least one guide roller is movably mounted.
- Each press roller 16, 17, 18, 19 has its own, endlessly circulating press belt 5, 6, 7, 8 in the form of a water-absorbing press felt for receiving and removing the water pressed from the fibrous web 1, which is guided over a plurality of guide rollers 9.
- the fibrous web 1 before and after each press nip 3,4 together with the two press belts 5,6,7,8 of the press nip 3,4 in a guide path 10,11,12,13, which is shorter than 800 mm is, guided.
- the decrease of the fibrous web 1 takes place from a sieve 20 of an upstream former.
- the press gaps 3.4 are made longer by the use of press rolls 16, 18 arranged in the form of shoe press rolls. These shoe press rolls have a flexible roll shell which is pressed against the other press roll 17, 19 via a press shoe 21 with a concave contact surface.
- the length of the press shoes 21 in the web running direction 2 is at least 250 mm.
- the pressing pressure in the press nip 3,4 is at least 1000 kN / m.
- a press belt 5, 7 is led away from the fibrous web 1 after each following a press nip 3.4 guide section 10.1 1.
- press belt 6, 8 runs together with the fibrous web 1 on a suction element 14, 15.
- this suction element 14 is formed after the first press nip 3 by a rotating, suctioned guide roll.
- Saugleitwalzen are expensive, but ensure safe web travel even at high machine speeds of 1000 m / min and more and medium and high basis weights of up to 250 g / m 2 .
- the evacuated guide roll has its own drive, which applies at least 15% of the total drive power of each press nip.
- the evacuated guide roller is looped by the corresponding press belt 6,8 at an angle of at least 15 °, preferably at least 30 °.
- a guide roll 9 which is looped around by a suction element 14, 15 from the corresponding press belt 6, 8, can have its own drive.
- the wrap angle of this guide roller 9 with its own drive is greater than 60 °.
- This driven guide roller 9 can be applied at least 15% of the total drive power of each press nip.
- the evacuated guide roller has several suction zones.
- the suction element 15 in the area of the routing of the press belt 7 as a simple, fixed Suction box formed. Because of the already relatively high strength of the fibrous web 1, this is sufficient.
- This suction box has between 3 and 5 suction slots.
Landscapes
- Paper (AREA)
- Treatment Of Fiber Materials (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102016201333.5A DE102016201333A1 (de) | 2016-01-29 | 2016-01-29 | Pressenpartie |
PCT/EP2016/080961 WO2017129308A1 (de) | 2016-01-29 | 2016-12-14 | Pressenpartie |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3408443A1 true EP3408443A1 (de) | 2018-12-05 |
EP3408443B1 EP3408443B1 (de) | 2019-11-06 |
Family
ID=57544446
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP16810374.5A Active EP3408443B1 (de) | 2016-01-29 | 2016-12-14 | Pressenpartie |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP3408443B1 (de) |
CN (1) | CN108884634B (de) |
DE (1) | DE102016201333A1 (de) |
WO (1) | WO2017129308A1 (de) |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4301750C2 (de) * | 1993-01-23 | 1996-10-10 | Voith Gmbh J M | Verfahren und Vorrichtung zum Entwässern einer Bahn mittels Pressen |
DE19511988C1 (de) * | 1995-03-31 | 1996-08-01 | Voith Sulzer Papiermasch Gmbh | Pressenpartie für eine Papiermaschine |
SE512026C2 (sv) * | 1998-05-15 | 2000-01-17 | Valmet Corp | Maskin för framställning av papper eller papp |
DE10116364A1 (de) * | 2001-04-02 | 2002-10-10 | Voith Paper Patent Gmbh | Saugelement |
DE10231074A1 (de) * | 2002-07-10 | 2004-01-22 | Voith Paper Patent Gmbh | Pressanordnung |
FI116400B (fi) * | 2002-11-19 | 2005-11-15 | Metso Paper Inc | Paperi- tai kartonkikoneen puristinosa |
FI123510B (fi) * | 2008-12-15 | 2013-06-14 | Metso Paper Inc | Järjestely puristinkudoksen kunnostamiseksi kuiturainakoneessa |
DE102011082161A1 (de) * | 2011-09-06 | 2013-03-07 | Voith Patent Gmbh | Pressenpartie einer Maschine zur Herstellung einer Faserstoffbahn |
-
2016
- 2016-01-29 DE DE102016201333.5A patent/DE102016201333A1/de not_active Withdrawn
- 2016-12-14 CN CN201680083791.6A patent/CN108884634B/zh active Active
- 2016-12-14 WO PCT/EP2016/080961 patent/WO2017129308A1/de active Application Filing
- 2016-12-14 EP EP16810374.5A patent/EP3408443B1/de active Active
Also Published As
Publication number | Publication date |
---|---|
DE102016201333A1 (de) | 2017-08-03 |
EP3408443B1 (de) | 2019-11-06 |
CN108884634B (zh) | 2020-11-06 |
CN108884634A (zh) | 2018-11-23 |
WO2017129308A1 (de) | 2017-08-03 |
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