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EP2622130B1 - Machine pour la déshydratation de cellulose - Google Patents

Machine pour la déshydratation de cellulose Download PDF

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Publication number
EP2622130B1
EP2622130B1 EP11751596.5A EP11751596A EP2622130B1 EP 2622130 B1 EP2622130 B1 EP 2622130B1 EP 11751596 A EP11751596 A EP 11751596A EP 2622130 B1 EP2622130 B1 EP 2622130B1
Authority
EP
European Patent Office
Prior art keywords
machine
wire
roll
wires
deflection
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.)
Not-in-force
Application number
EP11751596.5A
Other languages
German (de)
English (en)
Other versions
EP2622130A1 (fr
Inventor
Günter Mohrhardt
Paulo Falsarella
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Voith Patent GmbH
Original Assignee
Voith Patent GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Voith Patent GmbH filed Critical Voith Patent GmbH
Publication of EP2622130A1 publication Critical patent/EP2622130A1/fr
Application granted granted Critical
Publication of EP2622130B1 publication Critical patent/EP2622130B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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
    • 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

Definitions

  • the invention relates to a machine for the dewatering of pulp having a basis weight of 600 to 1350 g / m 2 , comprising a former with a lower sieve and an upper sieve, which at least partially form a twin-wire zone, with the lying between them, of a Headbox on the lower screen applied pulp are guided over a guide roller, wherein the twin-wire zone in Sieblaufraum of the lower wire upstream of a portion of the lower sieve Vorent camess proceedingsszone is arranged, which spans a plane, wherein the guide roller has a preferably closed, grooved or drilled roll shell and on the outside with a collecting device for centrifuged white water is provided and wherein the guide roller in the wire direction of the lower screen another, both screens leading guide roller having a preferably closed, grooved or drilled roll shell and the outside with a Provided catcher for centrifuged white water is downstream.
  • the creasing or the bore of the roll mantle of the respective deflection roll can be carried out in a known manner according to the prior art.
  • US4113556 a twin-wire former of a paper machine with two endless wire loops, which run together on a section from bottom to top and thereby successively partially wrap around two rollers. In the lower area, the pulp suspension, from which the paper web to be formed is produced, is fed to the common running path and dewatered there.
  • WO82 / 02910 each disclose a hybrid former of a paper machine consisting of a pre-dewatering section with a bottom wire and a twin wire section downstream therefrom.
  • the twin-wire section the lower wire is guided together with a top wire around two forming rolls arranged one after the other, at approximately the same level or one above the other.
  • the forming rollers are partially wrapped by both screens.
  • WO2010 / 102398 A1 proposed the use of a twin-wire press with three drainage zones.
  • the first dewatering zone is formed by the inlet wedge produced by the two screens, the second by an S-roll arrangement formed by two grooved rolls and the third by roll nips.
  • the object of the invention to develop a machine of the aforementioned types such that the disadvantages of the prior art are overcome.
  • the machine according to the invention should be suitable for conversions with limited space, as a rule predetermined, thereby causing no significant additional costs (conversion costs, maintenance box, operating costs) and bring no technological disadvantages.
  • the object of the invention is achieved in a machine of the type mentioned in that wherein both the guide roller and the further guide roller are arranged spatially above the plane spanned by the Vorentskyss proceedingsszone level, and the upper screen an upper wire tension of at least 15 kN / m, preferably of at least 20 kN / m, in particular of at least 25 kN / m.
  • the pre-dewatering zone defines a plane due to its two orientations in both the x and y directions. So it spans a plane.
  • the inventive design of the machine provides the advantage that the two guide rollers can be arranged above the pre-dewatering section. Their dimensions therefore have no significant, preferably no influence on the machine length more.
  • the former of the machine according to the invention is particularly suitable as a retrofit solution for conversions.
  • the machine according to the invention can be largely dispensed with "energy-consuming" drainage elements, preferably even completely.
  • 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 800 to 1750 mm, preferably from 900 to 1600 mm, in particular from 950 to 1500 mm.
  • the two screens preferably wrap around the first deflection roller with a first wrap angle in a range from 90 to 180 °, preferably from 100 to 160 °, in particular from 110 to 150 °. This in turn increases the drainage length and thus the dry contents of the pulp with an extremely gentle dewatering.
  • the two wires preferably run off in the upper half of the roll from the first guide roller. They run in a favorable manner - seen in the direction of the lower wire Sieblaufraum - in the first upper quadrant from the first guide roller and in the lower half of the roller on the second guide roller.
  • the second guide roller preferably with a second wrap in a range of 125 to 210 °, preferably from 130 to 200 °, in particular from 135 to 195 ° 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 upper half of the roller from the second guide roller. They run in a favorable manner - seen in the direction of the lower wire Sieblaufraum - in the second upper 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 6 kN / m, preferably of at least 8 kN / m, in particular of at least 10 kN / m.
  • the upper sieve has an upper sieve tension of at least 15 kN / m, preferably of at least 20 kN / m, in particular of at least 25 kN / m.
  • the predewatering zone formed from a section of the lower screen preferably extends horizontally or approximately horizontally and / or preferably has a zone length of at least 5,000 mm, preferably at least 7,500 mm, in particular at least 9,000 mm , on.
  • the dewatering behavior of the pulp in such an embodiment are relatively easily influenced and controlled.
  • the center lines of the two guide rollers preferably have a horizontal distance in the range of 100 to 600 mm, preferably from 200 to 500 mm, in particular from 250 to 400 mm.
  • the deflecting rollers arranged in this way therefore no longer have any significant, preferably no influence on the machine length.
  • the former of the machine according to the invention is particularly suitable as a retrofit solution for conversions.
  • FIG. 1 shows a schematic side view of an inventive machine 100 for the dewatering of pulp 1, which comprises a former 2.
  • the former 2 has a lower sieve 3 and an upper sieve 4, which at least partially form a double-wire zone 5.
  • the pulp 1 lying between them which is applied by a merely indicated headbox 6 onto the lower wire 3, is guided over a deflecting roller 7.
  • the twin-wire zone 5 is preceded by a pre-dewatering zone 8 formed from a section of the lower wire 3 in the wire-width direction S (arrow) of the lower wire 3, which spans a level 8.E.
  • This horizontal or approximately horizontally extending pre-dewatering zone 8 has a zone length 8.L of at least 5,000 mm, preferably of at least 7,500 mm, in particular of at least 9,000 mm, and is lower side, ie the lower sieve 3 and the pulp 1 lying thereon leading with several provided known drainage elements. These drainage elements are provided with the reference numeral 9 and each generate a vacuum 9.V less than or equal to 0.1 bar, preferably less than or equal to 0.8 bar.
  • the lower sieve 3 is guided before its entry into the pre-dewatering zone 8 around a breast roll 10, in the area of which the headbox 6 applies the pulp 1 to the same.
  • the deflection roller 7 has a closed, grooved or drilled roll shell 7.M and is provided on the outside with a collecting device 11 for centrifuged white water (arrows).
  • the collecting device 11 extends to such an extent that all white water (arrows) thrown off due to the action of centrifugal force is collected completely and can be reliably removed from the former 2, for example by means of a white water channel (not shown) known to a person skilled in the art (cf. FIG. 2 ).
  • the creasing or the bore of the roller shell 7.M of the guide roller 7 may be performed in a known manner according to the prior art.
  • the guide roller 7 has a roller diameter 7.D in the range of 800 to 1,750 mm, preferably from 900 to 1,600 mm, in particular from 950 to 1,500 mm, and is of the two wires 3, 4 with a first wrap 7W in a range of 90 to 180 °, preferably from 100 to 160 °, in particular from 110 to 150 °, looped around.
  • the two screens 3, 4 in the upper half of the roller, preferably in the first upper quadrant 7.Q run from the first guide roller 7 (see also FIG FIG. 2 ).
  • the guide roller 7 is in Sieblaufraum S (arrow) of the lower wire 3 another, both wires 3, 4 leading guide roller 12, which in turn has a closed, grooved or drilled roll shell 12.M and the outside is provided with a collecting device 13 for thrown off white water (arrows), downstream.
  • This collecting device 13 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 2, for example by means of a white water channel (not shown) known to a person skilled in the art (cf. FIG. 2 ).
  • the creasing or the bore of the roller shell 12.M of the guide roller 12 may be performed in a known manner according to the prior art.
  • the guide roller 12 has a roller diameter 12.D in the range of 800 to 1,750 mm, preferably from 900 to 1,600 mm, in particular from 950 to 1,500 mm.
  • the two wires 3, 4 run in the lower half of the roller on the second guide roller 12 and wrap around them with a second angle of wrap 12.W in a range of 125 to 210 °, preferably from 130 to 200 °, in particular from 135 to 195 °.
  • the two wires 3, 4 in the upper half of the roller, preferably in the second upper quadrant 12.Q preferably run together from the second guide roller 12.
  • the two wires 3, 4 are separated by means of a known separating device, such as a separating sucker 14 or a separating roller and the twin-wire zone 5 is thus terminated.
  • the pulp 1 is carried after the separation of the two wires 3, 4 on the lower wire 3 and transferred at a later date in a known manner in a press section 15, not shown, of the machine 1 according to the invention (see also FIG. 2 ).
  • both the guide roller 7 and the further guide roller 12 are arranged spatially above the plane spanned by the pre-dewatering zone 8 level 8.E.
  • the center lines 7.C, 12.C of the two guide rollers 7, 12 a horizontal distance A in the range of 100 to 600 mm, preferably from 200 to 500 mm, in particular from 250 to 400 mm, (see also FIG. 2 ).
  • the lower wire 3 has a lower wire tension 3.T of at least 6 kN / m, preferably of at least 8 kN / m, in particular of at least 10 kN / m, whereas the upper sieve 4 has an upper sieve tension 4.T of at least 15 kN / m, preferably of at least 20 kN / m, in particular of at least 25 kN / m.
  • the specific production of such machine 100 for dewatering pulp 1 can be up to 500 t / d per meter of web width.
  • FIG. 2 shows a detail of the in the FIG. 1 illustrated machine 100 for the dewatering of pulp 1 according to the invention, comprising a former 2.
  • the deflection roller 7 has, as already stated, a closed, grooved or drilled roll shell 7.M and is provided on the outside with a collecting device 11 for centrifuged white water (arrows).
  • the collecting device 11 extends to an extent that all due to the action of centrifugal centrifugal force thrown off white water (arrows) is fully collected and can be reliably removed from the former 2, for example by means not shown, the expert but well known white water gutter.
  • the guide roller 7 has a roller diameter 7.D in the range of 800 to 1,750 mm, preferably from 900 to 1,600 mm, in particular from 950 to 1,500 mm, and is of the two wires 3, 4 with a first wrap 7W in a range of 90 to 180 °, preferably from 100 to 160 °, in particular from 110 to 150 °, looped around.
  • the two wires 3, 4 in the upper half of the roll, preferably in the first upper quadrant 7.Q, from the first guide roller 7 from.
  • the deflection roller 7 is, as already stated, in Sieblaufraum S (arrow) of the lower screen 3, a further, both screens 3, 4 leading guide roller 12, which in turn has a closed, grooved or drilled roll shell 12.M and the outside with a catch 13th is provided for centrifuged white water (arrows), downstream.
  • This collecting device 13 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 2, for example by means of a white water channel, not shown to those skilled in the art.
  • the guide roller 12 has a roller diameter 12.D in the range of 800 to 1,750 mm, preferably from 900 to 1,600 mm, in particular from 950 to 1,500 mm.
  • the two wires 3, 4 run in the lower half of the roller on the second guide roller 12 and wrap around them with a second angle of wrap 12.W in a range of 125 to 210 °, preferably from 130 to 200 °, in particular from 135 to 195 °.
  • the two wires 3, 4 in the upper half of the roller, preferably in the second upper quadrant 12.Q preferably run together from the second guide roller 12.
  • the two screens 3, 4 are separated by means of a known separating device, such as a separating sucker 14 or a separating roller and the twin-wire zone 5 is thus terminated (see also FIG. 1 ).
  • both the guide roller 7 and the further guide roller 12 are arranged spatially above the plane spanned by the pre-dewatering zone 8 level 8.E.
  • the center lines 7.C, 12.C of the two guide rollers 7, 12 have a horizontal distance A in the range of 100 to 600 mm, preferably from 200 to 500 mm, in particular from 250 to 400 mm.
  • a machine of the type mentioned above is improved by the invention so that the disadvantages of the prior art are overcome.
  • the machine according to the invention is suitable for conversions with limited, generally predetermined installation spaces, causes no significant additional costs (conversion costs, maintenance costs, operating costs) and does not entail any technological disadvantages.

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  • Paper (AREA)

Claims (12)

  1. Machine (100) d'essorage de cellulose (1) présentant un poids par unité de surface de 600 à 1 350 g/m2,
    la machine comportant un façonneur (2) doté d'un tamis inférieur (3) et d'un tamis supérieur (4) qui forment au moins sur une partie du parcours une zone (5) à double tamis,
    les tamis étant guidés sur un cylindre de renvoi (7) avec la cellulose (1) située entre eux et appliquée sur le tamis inférieur (3) par une amenée de matière (5),
    une zone (8) de pré-essorage formée d'une partie du tamis inférieur (3) étant disposée en amont de la zone (5) à double tamis dans la direction (S) d'avancement du tamis inférieur (3) et sous-tendant un plan (8.E),
    le cylindre de renvoi (7) présentant une enveloppe (7.M) de préférence fermée, nervurée ou perforée et étant doté sur son côté extérieur d'un dispositif de reprise (11) de l'eau de tamisage extraite,
    un autre cylindre de renvoi (12) qui conduit les deux tamis (3, 4) et qui présente une enveloppe (12.M) de préférence fermée, nervurée ou perforée et qui est doté du côté extérieur d'un dispositif (13) de reprise de l'eau de tamis extraite étant disposé en aval du cylindre de renvoi (7) dans la direction d'avancement (S) du tamis inférieur (3),
    caractérisée en ce que
    tant le cylindre de renvoi (7) que l'autre cylindre de renvoi (12) sont disposés spatialement au-dessus du plan (8.E) sous-tendu par la zone (8) de pré-essorage et
    en ce que le tamis supérieur (4) présente une tension supérieure de tamis (4.T) d'au moins 15 kN/m, de préférence d'au moins 20 kN/m et en particulier d'au moins 25 kN/m.
  2. Machine (100) selon la revendication 1, caractérisée en ce que les deux cylindres de renvoi (7, 12) présentent chacun un diamètre (7.D, 12.D) de l'ordre de 800 à 1 750 mm, de préférence de 900 à 1 600 mm et en particulier de 950 à 1 500 mm.
  3. Machine (100) selon les revendications 1 ou 2, caractérisée en ce que les deux tamis (3, 4) s'enroulent sur le premier cylindre de renvoi (7) sur un premier angle de boucle (7.W) de l'ordre de 90 à 180°, de préférence de 100 à 160° et en particulier de 110 à 150°.
  4. Machine (100) selon l'une des revendications précédentes, caractérisée en ce que les deux tamis (3, 4) se déroulent dans la moitié supérieure du premier cylindre de renvoi (7).
  5. Machine (100) selon la revendication 4, caractérisée en ce que dans la direction d'avancement (S) du tamis inférieur (3), les deux tamis (3, 4) s'enroulent sur le premier quadrant supérieur (7.Q) du premier cylindre de renvoi (7).
  6. Machine (100) selon l'une des revendications précédentes, caractérisée en ce que les deux tamis (3, 4) s'enroulent sur la moitié inférieure du deuxième cylindre de renvoi (12).
  7. Machine (100) selon l'une des revendications précédentes, caractérisée en ce que les deux tamis (3, 4) s'enroulent sur le deuxième cylindre de renvoi (12) sur un premier angle de boucle (12.W) de l'ordre de 125 à 210°, de préférence de 130 à 200° et en particulier de 135 à 195°.
  8. Machine (100) selon l'une des revendications précédentes, caractérisée en ce que les deux tamis (3, 4) s'enroulent sur la moitié supérieure du deuxième cylindre de renvoi (12).
  9. Machine (100) selon l'une des revendications précédentes, caractérisée en ce que dans la direction d'avancement (S) du tamis inférieur (3), les deux tamis (3, 4) s'enroulent de préférence ensemble sur le deuxième quadrant supérieur (12.Q) du deuxième cylindre de renvoi (12).
  10. Machine (100) selon l'une des revendications précédentes, caractérisée en ce que le tamis inférieur (3) présente une tension inférieure de tamis (3.T) d'au moins 8 KN/m, de préférence d'au moins 10 KN/m et en particulier d'au moins 12 KN/m.
  11. Machine (100) selon l'une des revendications précédentes, caractérisée en ce que la zone de pré-essorage (8) formée d'une partie de tamis inférieur (3) s'étend à l'horizontale ou sensiblement à l'horizontale et/ou présente une longueur (8.L) d'au moins 5 000 mm, de préférence d'au moins 7 500 mm et en particulier d'au moins 9 000 mm.
  12. Machine (100) selon l'une des revendications précédentes, caractérisée en ce que les axes (7.L, 12.L) des deux cylindres de renvoi (7, 12) présentent un écart horizontal (A) de l'ordre de 100 à 600 mm, de préférence de 200 à 500 mm et en particulier de 250 à 400 mm.
EP11751596.5A 2010-09-30 2011-08-31 Machine pour la déshydratation de cellulose Not-in-force EP2622130B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102010041730A DE102010041730A1 (de) 2010-09-30 2010-09-30 Maschine für die Entwässerung von Zellstoff
PCT/EP2011/064940 WO2012041624A1 (fr) 2010-09-30 2011-08-31 Machine pour la déshydratation de cellulose

Publications (2)

Publication Number Publication Date
EP2622130A1 EP2622130A1 (fr) 2013-08-07
EP2622130B1 true EP2622130B1 (fr) 2014-07-30

Family

ID=44543242

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11751596.5A Not-in-force EP2622130B1 (fr) 2010-09-30 2011-08-31 Machine pour la déshydratation de cellulose

Country Status (5)

Country Link
EP (1) EP2622130B1 (fr)
CN (1) CN103154363A (fr)
BR (1) BR112013007047A2 (fr)
DE (1) DE102010041730A1 (fr)
WO (1) WO2012041624A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104246071A (zh) * 2012-03-28 2014-12-24 沃依特专利有限责任公司 用于纸浆脱水的机器
DE102018121032A1 (de) * 2018-08-29 2019-06-13 Voith Patent Gmbh Verfahren zum entwässern von zellstoff

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI761030A (fr) * 1976-04-14 1977-10-15 Valmet Oy
DE3261499D1 (en) * 1981-02-28 1985-01-24 Voith Gmbh J M Device for continuously dehydrating a fiber web
SE458212B (sv) * 1987-07-17 1989-03-06 Valmet Paper Machinery Inc Formare foer formning av en pappersbana
CN2557570Y (zh) * 2002-07-07 2003-06-25 李风宁 一种夹网成形器
DE102007000036A1 (de) 2007-01-25 2008-07-31 Voith Patent Gmbh Verfahren zum Entwässern von Zellstoff und Entwässerungsmaschine zur Durchführung des Verfahrens
CA2657627A1 (fr) * 2009-03-10 2010-09-10 Services Techniques Hds Presse a double toile

Also Published As

Publication number Publication date
CN103154363A (zh) 2013-06-12
EP2622130A1 (fr) 2013-08-07
WO2012041624A1 (fr) 2012-04-05
BR112013007047A2 (pt) 2017-07-25
DE102010041730A1 (de) 2012-04-05

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