EP2126202A1 - Method for dehydrating pulp, and dehydration machine for carrying out the method - Google Patents
Method for dehydrating pulp, and dehydration machine for carrying out the methodInfo
- Publication number
- EP2126202A1 EP2126202A1 EP08701485A EP08701485A EP2126202A1 EP 2126202 A1 EP2126202 A1 EP 2126202A1 EP 08701485 A EP08701485 A EP 08701485A EP 08701485 A EP08701485 A EP 08701485A EP 2126202 A1 EP2126202 A1 EP 2126202A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- wire
- pulp
- dewatering
- zone
- guide roller
- 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
- D21F1/00—Wet end of machines for making continuous webs of paper
- D21F1/66—Pulp catching, de-watering, or recovering; Re-use of pulp-water
- D21F1/80—Pulp catching, de-watering, or recovering; Re-use of pulp-water using endless screening belts
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F9/00—Complete machines for making continuous webs of paper
- D21F9/003—Complete machines for making continuous webs of paper of the twin-wire type
Definitions
- the invention relates to a method for dewatering pulp in a former, in which the pulp applied to a lower wire by a headbox is passed between the lower wire and an upper wire by means of a guide roller at least in sections forming a twin-wire zone.
- the invention relates to a dewatering machine for pulp, comprising a former with a lower sieve and an upper sieve, which at least partially form a twin-wire zone and are guided with the lying between them, applied by a headbox on the lower wire pulp over a guide roller.
- the dewatering machine is particularly suitable for carrying out the method.
- Such a dewatering machine is known, for example, from international application WO 00/31336 A1.
- Twin-wire zone of this dewatering machine is preceded by a wedge-shaped converging and formed by the two screens space in which a headbox introduces the pulp with a first dry content.
- the two by the
- Room-guided sieves are held on chamber units, each containing at least one white water receiving chamber.
- the dewatering machine shown in Figure 2 of said document has the disadvantage that they only limited with a limited due to the respective limited drainage capacity of the chamber units Production speed, that is, Sieb beau can be operated. This is usually in a range of up to 200 m / min. Due to the reduced production speed of the dewatering machine also their production amount is also correspondingly low in a conventional machine width.
- the process according to the invention makes it possible to achieve higher dry contents of the pulp due to improved, ie intensified dewatering of the pulp even at higher wire speeds.
- the intensification of the drainage takes place on the one hand by their division into different phases, on the other hand by the type of drainage.
- a drainage due to applied screen stresses among other things, also much gentler than a drainage due to the introduction of pressure pulses, they are now mechanical or pneumatic.
- a greater amount of pulp can be produced with improved dry contents and improved properties.
- "energy-consuming" drainage elements can be dispensed with, preferably even completely eliminated, and the required drive power is reduced by about 25% and the vacuum requirement to be installed compared with the known processes for dewatering pulp in a former about 40%.
- the lower sieve for further dewatering of the pulp a lower wire tension of at least 20 kN / m, preferably at least 25 kN / m, in particular at least 30 kN / m yields
- the upper sieve for further dewatering of the pulp an upper wire tension of at least 6 kN / m, preferably of at least 8 kN / m, in particular of at least 10 kN / m yields.
- a pulp which has a weight per unit area of 600 to 1,200 g / m 2 and / or a consistency of 1.2 to 2.2%, and also preferably at a screen speed of at least 200 m / min, preferably of at least 250 m / min, in particular of at least 300 m / min, drained.
- the pulp is dehydrated in the region of the pre-dewatering zone with a vacuum of less than or equal to 0.1 bar, preferably less than or equal to 0.8 bar.
- the vacuum requirement to be installed is noticeably reduced.
- the object of the invention is achieved in a dewatering machine of the type mentioned in that the Doppelsiebzone upstream in the wire running direction of the lower wire is formed from a portion of the lower sieve Vorent camess mecanicszone that the guide roller has a closed roll shell and provided on the outside with a catcher for thrown off white water is and that the guide roller in Sieblaufraum of the lower wire another, both screens leading guide roller having a closed roll shell and is provided on the underside with a catcher for thrown off white water downstream.
- the use of the inventive method of "energy-consuming" drainage elements largely, preferably even completely omitted.
- the required drive power is reduced by about 25% and the vacuum requirement to be installed by about 40%.
- the two deflection rollers preferably each have a roll diameter in the range from 1,200 to 1,750 mm, preferably from 1,450 to 1,600 mm.
- the two wires preferably wrap around the first deflection roller with a first wrap angle in a range from 90 to 135 °, preferably from 110 to 125 °. This in turn increases the drainage length and thus the dry contents of the pulp with an extremely gentle dewatering.
- the predewatering zone formed from a section of the lower sieve is preferably oriented horizontally or approximately horizontally.
- the dewatering behavior of the pulp can be relatively easily influenced and controlled in such an embodiment.
- the two wires preferably run in the lower half of the roll from the first guide roller. They run in a favorable manner - seen in the direction Sieblaufraum the lower sieve - in the first lower quadrant of the first guide roller and in the upper half of the roller on the second guide roller.
- the second guide roller preferably with a second wrap in a range of 125 to 180 °, preferably from 145 to 165 ° wrap around. This again increases the drainage length and thus the dry contents of the pulp with an extremely gentle dewatering.
- the two screens preferably run in the lower half of the roller from the second guide roller. They run in a favorable manner - seen in Sieblaufraum of the lower sieve - in the first lower quadrant of the second guide roller preferably together. This again favors the achievement of the shortest possible dewatering machine and the avoidance of rewetting of the pulp.
- the lower wire preferably has a lower wire tension of at least 20 kN / m, preferably of at least 25 kN / m, in particular of at least 30 kN / m
- the upper wire preferably has an upper wire tension of at least 6 kN / m, preferably at least 8 kN / m, in particular at least 10 kN / m.
- FIG. 1 shows a schematic side view of an embodiment of a dewatering machine 1 according to the invention for pulp 2, which comprises a former 3.
- the former 3 has a lower sieve 4 and an upper sieve 5, which at least partially form a double-wire zone 6.
- the pulp 2 lying between them applied by a merely indicated headbox 7 to the lower sieve 4, is guided over a deflecting roller 8.
- the twin-wire zone 6 is preceded by a pre-dewatering zone 9 formed from a section of the lower wire 4 in the wire-running direction S (arrow) of the lower wire 4.
- This horizontally or approximately horizontally oriented pre-dewatering zone 9 has a length L.9 in the range of 5,000 to 8,000 mm and is provided on the underside, ie the lower sieve 4 and the pulp 2 lying thereon, with several known dewatering elements. These dewatering elements are provided with the reference numeral 10 and each generate a vacuum V.10 less than or equal to 0.1 bar, preferably less than or equal to 0.8 bar.
- the lower sieve 4 is guided before its entry into the pre-dewatering zone 9 around a breast roll 11, in the area of which the headbox 7 applies the pulp 2 to the same.
- the guide roller 8 has a closed roller shell M.8 and is provided on the outside with a collecting device 12 for centrifuged white water (arrows).
- the collecting device 12 extends to an extent that all due to the action of centrifugal thrown off white water (arrows) is fully collected and can be reliably removed from the former 3, for example by means not shown, the expert but known white water gutter.
- the guide roller 8 has a roller diameter D.8 in the range of 1,200 to 1,750 mm, preferably from 1,450 to 1,600 mm, and is of the two wires 4, 5 with a first wrap angle A.8 in a range from 90 to 135 °, preferably from 110 to 125 °, looped.
- the deflection roller 8 is in Sieblaufraum S (arrow) of the lower sieve 4 another, both sieves 4, 5 leading guide roller 13, which in turn has a closed roll shell M.13 and bottom side with a collecting device 14 for thrown off white water (arrows), downstream.
- This collecting device 14 also extends to such an extent that all white water (arrows) thrown off due to the action of centrifugal force is completely absorbed and can be reliably removed from the former 3, for example by means of a white water channel, not shown to those skilled in the art.
- the guide roller 13 has a roller diameter D.13 in the range of 1,200 to 1,750 mm, preferably from 1,450 to 1,600 mm.
- the two wires 4, 5 run in the upper half of the roll on the second guide roller 13 and wrap around it with a second wrap angle A.13 in a range of 125 to 180 °, preferably from 145 to 165 °.
- the two wires 4, 5 in the lower half of the roll, preferably in the first lower quadrant Q.13 preferably run together from the second deflection roll 13.
- the two sieves 4, 5 are guided over a separating sucker 15, in the area of which they are separated on the basis of the present geometry, and the twin-wire zone 6 is thus terminated.
- the pulp 2 is carried on the lower wire 4 after the separation of the two wires 4, 5 and transferred at a later time in a known manner in a press section of the dewatering machine 1, not shown.
- the lower wire 4 has a lower wire tension T.4 (double arrow) of at least 20 kN / m, preferably of at least 25 kN / m, in particular of at least 30 kN / m, whereas the upper wire 5 has an upper wire tension T.5 (double arrow) of at least 6 kN / m, preferably of at least 8 kN / m, in particular of at least 10 kN / m.
- the device 1 described in the single figure is particularly suitable for carrying out the method according to the invention for dewatering pulp 2 in a former 3, in which the pulp 2 applied from a headbox 7 to a lower wire 4 between the lower wire 4 and an upper sieve 5 is guided at least in sections forming a twin-wire zone 6 via a guide roller 8, wherein the pulp 2 is pre-dewatered by means of the lower sieve 4 in a pre-dewatering zone 9 upstream of the twin sieve zone 6 (arrow) of the lower sieve 4, and wherein Pulp 2 in which a further deflection roller 13 having double-wire zone 6 by means of the two screens 4, 5 applied screen stresses T.4 (double arrow), T.5 (double arrow) is further dewatered.
- the pulp 2 which preferably has a basis weight F of 600 to 1200 g / m 2 and / or a consistency K of 1, 2 to 2.2%, can thus be at a screen speed v (arrow) of at least 200 m / min , preferably of at least 250 m / min, in particular of at least 300 m / min, dehydrate.
- the invention improves both a method and a dewatering machine of the aforementioned types such that the disadvantages of the prior art are overcome and that higher dry contents of the pulp can be achieved efficiently and inexpensively.
Landscapes
- Paper (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE200710000036 DE102007000036A1 (en) | 2007-01-25 | 2007-01-25 | Process for dewatering pulp and dewatering machine for carrying out the process |
PCT/EP2008/050375 WO2008090052A1 (en) | 2007-01-25 | 2008-01-15 | Method for dehydrating pulp, and dehydration machine for carrying out the method |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2126202A1 true EP2126202A1 (en) | 2009-12-02 |
EP2126202B1 EP2126202B1 (en) | 2015-10-07 |
Family
ID=39315099
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP08701485.8A Not-in-force EP2126202B1 (en) | 2007-01-25 | 2008-01-15 | Method for dehydrating pulp, and dehydration machine for carrying out the method |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP2126202B1 (en) |
CN (1) | CN101589194B (en) |
DE (1) | DE102007000036A1 (en) |
WO (1) | WO2008090052A1 (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
RU2447218C2 (en) * | 2010-06-16 | 2012-04-10 | Анатолий Кузьмич Соломаха | Compact device for production of sanitary-hygiene types of paper |
DE102010041730A1 (en) * | 2010-09-30 | 2012-04-05 | Voith Patent Gmbh | Machine for the dewatering of pulp |
DE102011003304A1 (en) | 2011-01-28 | 2012-08-02 | Voith Patent Gmbh | Pulp dewatering cover for a pulp dewatering machine |
EP2831340A1 (en) * | 2012-03-28 | 2015-02-04 | Voith Patent GmbH | Machine for dewatering pulp |
DE102012204936A1 (en) | 2012-03-28 | 2013-10-02 | Voith Patent Gmbh | Method for dewatering pulp in former of dewatering machine, involves carrying-out one of deflection rollers with open roll shell and with suction- or discharge zone, where pulp is evacuated or blown in area of suction- or discharge zone |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AT376722B (en) * | 1983-02-09 | 1984-12-27 | Andritz Ag Maschf | DRAINAGE MACHINE FOR CELLULAR OD. DGL. FIBER MATERIAL |
FI831275L (en) * | 1983-04-15 | 1984-10-16 | Rauma Repola Oy | FOERFARANDE OCH ANORDNING FOER AVLAEGSNING AV VAETSKA UR FIBERMASSA. |
IT1283761B1 (en) * | 1996-04-22 | 1998-04-30 | Sernagiotto Spa | DOUBLE BELT PRESS WITH HIGH DEHYDRATION CAPACITY |
US5783045A (en) * | 1996-05-06 | 1998-07-21 | Beloit Technologies, Inc. | Pulp and linerboard former with improved dewatering |
CN2272028Y (en) * | 1996-08-01 | 1998-01-07 | 四川省资中县轻工机械厂 | Double-screen filter-press vacuum pulp cleaner |
FI982540A (en) | 1998-11-24 | 2000-05-25 | Valmet Corp | Process for drying cellulose |
CN2394944Y (en) * | 1999-09-21 | 2000-09-06 | 李保民 | Long net double roll pulp extruder |
DE19950805A1 (en) * | 1999-10-21 | 2001-04-26 | Voith Paper Patent Gmbh | Former |
CN2557570Y (en) * | 2002-07-07 | 2003-06-25 | 李风宁 | Web clamping formation device |
-
2007
- 2007-01-25 DE DE200710000036 patent/DE102007000036A1/en not_active Withdrawn
-
2008
- 2008-01-15 EP EP08701485.8A patent/EP2126202B1/en not_active Not-in-force
- 2008-01-15 CN CN200880003145.XA patent/CN101589194B/en not_active Expired - Fee Related
- 2008-01-15 WO PCT/EP2008/050375 patent/WO2008090052A1/en active Application Filing
Non-Patent Citations (1)
Title |
---|
See references of WO2008090052A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE102007000036A1 (en) | 2008-07-31 |
WO2008090052A1 (en) | 2008-07-31 |
CN101589194B (en) | 2013-04-24 |
BRPI0806085A2 (en) | 2011-08-30 |
EP2126202B1 (en) | 2015-10-07 |
CN101589194A (en) | 2009-11-25 |
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