EP3548664B1 - Ensemble de pressage - Google Patents

Ensemble de pressage Download PDF

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Publication number
EP3548664B1
EP3548664B1 EP17811885.7A EP17811885A EP3548664B1 EP 3548664 B1 EP3548664 B1 EP 3548664B1 EP 17811885 A EP17811885 A EP 17811885A EP 3548664 B1 EP3548664 B1 EP 3548664B1
Authority
EP
European Patent Office
Prior art keywords
press
fibrous web
belt
arrangement according
roll
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.)
Active
Application number
EP17811885.7A
Other languages
German (de)
English (en)
Other versions
EP3548664A1 (fr
Inventor
Johann Moser
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
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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 EP3548664A1 publication Critical patent/EP3548664A1/fr
Application granted granted Critical
Publication of EP3548664B1 publication Critical patent/EP3548664B1/fr
Active 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
    • D21F3/00—Press section of machines for making continuous webs of paper
    • D21F3/02—Wet presses
    • D21F3/04—Arrangements thereof
    • 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 arrangement for dewatering a paper, cardboard, tissue or other fibrous web in a machine for the production and/or finishing of the same, with a suction roll around which an endlessly revolving, water-absorbing and air-permeable dewatering belt and the outer fibrous web are wrapped, and a following in the direction of web travel, surrounded by a smooth, endlessly revolving, cylindrical central roll, which is involved in the formation of at least one press nip with a press roll, around which an endlessly revolving, water-absorbing dewatering belt is wrapped, with the transfer belt taking over the fibrous web from the dewatering belt of the suction roll .
  • Such press assemblies are, for example, from EP 1 342 837 A2 as well as the EP 0 107 606 A2 well-known and because of their compactness they offer not only space but also cost advantages.
  • the object of the invention is therefore to ensure efficient dewatering with reliable web guidance.
  • the construction of the press arrangement is simplified considerably by the distance and the associated decoupling between the suction roll and the central roll.
  • the transfer press nip ensures that the web is securely transferred from the dewatering belt to the much smoother, non-permeable transfer belt. Accordingly, to avoid rewetting of the fibrous web, the dewatering belt should be guided away from the fibrous web immediately after the transfer press nip, so that the fibrous web is guided from the transfer press nip to the central roll solely by the transfer belt.
  • the transfer belt runs vertically between the transfer press nip and the central roller or is inclined in the direction of web travel by a maximum of 35° to the vertical.
  • the dewatering can be supported by an increased viscosity as a result of heating the fibrous web.
  • the fibrous web should be subjected to steam from a steam blower box between the transfer press nip and the central roll.
  • the central roll forms a press nip with at least two press rolls each wrapped around by a separate, endlessly circulating and water-absorbing dewatering belt.
  • At least one press nip of the cylindrical central roller should be designed to be longer for intensive but volume-saving dewatering.
  • the extended press nip is formed in a known manner by a shoe press roll which has a flexible roll mantle which runs in the area of the press nip over a pressure shoe with a concave pressing surface.
  • the central roller also offers sufficient space for the realization of several press nips, it should have a diameter of at least 100 cm, preferably at least 160 cm.
  • the suction roll should form a press nip, preferably the first press nip of the press arrangement, with a press roll around which an endlessly revolving, water-absorbing dewatering belt is wrapped. Due to the still relatively high moisture content of the fibrous web, low pressing forces are sufficient.
  • the dewatering belt of the suction roll should take the fibrous web from an endless circulating belt, preferably a forming fabric of an upstream former for sheet formation and/or the fibrous web after the central roll from the transfer belt to an endless circulating belt, preferably an air-permeable drying fabric of a following drying unit be handed over to the machine.
  • the fibrous web is continuously guided by at least one belt between the former and the drying unit.
  • the dewatering can be further supported by the forming fabric being guided through a pre-press nip before the fibrous web is delivered, together with an endlessly circulating, water-absorbing dewatering belt and the fibrous web lying in between.
  • This press arrangement is used for dewatering a fibrous web 1, in particular a cardboard web in a paper machine for the production of the same.
  • a high rigidity of the cardboard should be achieved by an efficient, but nevertheless volume-preserving dewatering of the fibrous web 1 .
  • the smooth transfer belt creates a good carton surface, so that an offset press, which usually follows, can be omitted.
  • the fibrous web 1 is transferred from the water-permeable forming fabric 22 to a water- and air-permeable dewatering belt 4 of the subsequent press arrangement.
  • the fibrous web 1 is pre-dewatered.
  • the forming fabric 22 is guided together with a water-absorbing dewatering belt 23 and the fibrous web 1 lying in between through a pre-press nip 10 formed by two press rollers 24,25.
  • the dewatering belt 4 that takes over the fibrous web 1 from the forming fabric 22 is arranged above it and guides the fibrous web 1 together with a dewatering belt 19 running under the fibrous web 1 through a first press nip 11.
  • the first press nip 11 is formed by a lower cylindrical press roller 20 and one above it lying suction roll 2 formed.
  • the press roll 20 can also be a shoe press roll.
  • the fibrous web 1 is heated by means of steam being applied via a steam blower box 9 in the wrap area of the suction roll 2, which promotes the dewatering of the fibrous web 1.
  • the fibrous web 1 is transferred from the upper dewatering belt 4 to a water-impermeable and smooth transfer belt 6 arranged under the fibrous web 1 .
  • the dewatering belt 4 , the transfer belt 6 and the fibrous web 1 lying between them are guided through a transfer press nip 12 which is formed by the suction roll 2 and a cylindrical press roll 7 .
  • This transfer belt 6 guides the fibrous web 1 lying on top around a central roller 3 rotating under the transfer belt 6 and, after being wrapped around the central roller 3, transfers it to an upper, endlessly circulating and air-permeable drying fabric 21 of a following drying unit of the paper machine.
  • the following drying unit is formed by a drying group in which the fibrous web 1 is supported by the drying fabric 21 for drying and is guided alternately over heated drying cylinders 26 and guide rollers 27 .
  • the fibrous web 1 is constantly guided between the former and the drying unit by at least one belt 4.6, which makes the web run very stable even at high machine speeds and high basis weights of the fibrous web 1.
  • the clearance between the suction roll 2 and the central roll 3 is between 250 and 2,000 mm.
  • the decoupling of both rollers 2.3 simplifies the construction of the press arrangement considerably.
  • the distance is also necessary in particular because contact between the central roller 3 and the suction roller 2 cannot be achieved because of the press roller 7 .
  • the transfer belt 6 runs perpendicularly in this section or, as shown in the figure, slightly in the machine direction perpendicular inclined.
  • the fibrous web 1 between the transfer press nip 12 and the central roller 3 is again subjected to steam from a steam blower box 8 .
  • the cylindrical central roller 3 With a diameter of more than 160 cm, the cylindrical central roller 3 is relatively large, so that two further press gaps 13, 14 can be formed in the area where the transfer belt 6 wraps around the outer fibrous web 1.
  • the first press nip 13 in the direction of web travel 5 is formed between the central roller 3 and a cylindrical press roller 17 around which a separate dewatering belt 15 is wrapped.
  • the second subsequent press nip 14 is extended.
  • a shoe press roller 18 also wrapped by an endlessly circulating dewatering belt 16 , is pressed against the central roller 3 .
  • Shoe press rollers 18 generally consist of a flexible roller shell that runs over a pressure shoe with a concave pressing surface in the area of the extended press nip 14 .
  • the endlessly revolving dewatering belts 4,15,16,19,23 are used for receiving and transporting away the water pressed out of the fibrous web 1 in the respective press nip 10,11,12,13,14 and are mostly designed as press felts.
  • the acquisition of the fibrous web 1 is often supported by a suction-controlled guide roller 28, 29 wrapped around the absorbing dewatering belt 4 or drying fabric 21.
  • the evacuated guide roller 28,29 has a perforated roller shell, the interior of which is connected to a vacuum source.

Landscapes

  • Paper (AREA)
  • Control And Other Processes For Unpacking Of Materials (AREA)
  • Finger-Pressure Massage (AREA)
  • Treatment Of Fiber Materials (AREA)

Claims (13)

  1. Agencement de presse pour l'égouttage d'une bande de papier, de carton, de papier tissu ou d'une autre bande fibreuse (1) dans une machine de fabrication et/ou d'ennoblissement de celle-ci, avec un cylindre aspirant (2) entouré d'une bande d'égouttage (4) circulant sans fin, absorbant l'eau et perméable à l'air, ainsi que de la bande fibreuse (1) située à l'extérieur, et avec un cylindre cylindrique (3) suivant dans le sens de circulation de la bande (5), d'un rouleau central cylindrique (3) entouré d'une bande de transfert lisse (6) circulant sans fin, qui participe à la formation d'au moins une fente de pressage (13, 14) avec une bande de déshydratation (15,16), la bande de transfert (6) prenant en charge la bande fibreuse (1) de la bande d'égouttage (4) du rouleau aspirant (2) et le rouleau aspirant (2) formant avec un rouleau presseur de transfert (7) une fente de pressage de transfert (12), à travers laquelle la bande d'égouttage (4) du rouleau aspirant (2) et la bande de transfert (6) passent ensemble avec la bande de matière fibreuse (1) située entre elles, caractérisé en ce que le rouleau central (3) forme respectivement une fente de pressage (13, 14) avec au moins deux rouleaux de pressage (17, 18) entourés chacun par une bande d'égouttage (15, 16) absorbant l'eau et circulant sans fin.
  2. Ensemble de pressage selon la revendication 1, caractérisé en ce que le rouleau aspirant (2) et le rouleau central (3) sont espacés l'un de l'autre et la bande de matière fibreuse (1) est guidée par la bande de transfert (6) seule depuis la fente de presse de transfert (12) vers le rouleau central (3).
  3. Ensemble de pressage selon la revendication 1 ou 2, caractérisé en ce que la bande de transfert (6) s'étend entre la ligne de contact de transfert (12) et le rouleau central (3) verticalement ou inclinée jusqu'à 35° par rapport à la verticale dans le sens de défilement de la bande (5).
  4. Ensemble de pressage selon l'une des revendications précédentes, caractérisé en ce que
    la bande de matière fibreuse (1) est alimentée en vapeur par une boîte de soufflage de vapeur (8) entre la fente de presse de transfert (12) et le rouleau central (3).
  5. Ensemble de pressage selon l'une des revendications précédentes, caractérisé en ce que
    au moins une fente de pressage (13, 14) du rouleau central (4) est réalisée de manière prolongée.
  6. Ensemble de pressage selon l'une des revendications précédentes, caractérisé en ce que
    en ce que les deux fentes de pressage (13, 14) du rouleau central (3) sont réalisées de manière prolongée.
  7. Ensemble de pressage selon l'une des revendications précédentes, caractérisé en ce que
    le rouleau central (3) a un diamètre d'au moins 100 cm, de préférence d'au moins 160 cm.
  8. Ensemble de pressage selon l'une des revendications précédentes, caractérisé en ce que
    le rouleau aspirant (2) forme avec un rouleau presseur (20) entouré par une bande de drainage (19) absorbant l'eau et tournant sans fin une fente de pressage (11), de préférence la première fente de pressage (11) du dispositif de pressage.
  9. Ensemble de pressage selon l'une des revendications précédentes, caractérisé en ce que
    une boîte de soufflage de vapeur (9) est associée à la bande fibreuse (1) dans la zone d'enroulement du rouleau aspirant (2), avant la fente de pressage de transfert (12).
  10. Ensemble de pressage selon l'une des revendications précédentes, caractérisé en ce que
    la bande de matière fibreuse (1) est transférée après le rouleau central (3) de la bande de transfert (6) à une bande circulant sans fin, de préférence une toile de séchage (21) perméable à l'air d'une unité de séchage suivante de la machine.
  11. Ensemble de pressage selon l'une des revendications précédentes, caractérisé en ce que
    la bande d'égouttage (4) du rouleau aspirant (2) prend en charge la bande de matière fibreuse (1) d'une bande circulant sans fin, de préférence d'une toile de formation (22) d'une formeuse placée en amont pour former des feuilles.
  12. Ensemble de pressage selon la revendication 10 ou 11, caractérisé en ce que la bande de matière fibreuse (1) est guidée en permanence par au moins une bande (4, 6) entre le formeur et l'unité de séchage.
  13. Agencement de pressage selon la revendication 11 ou 12, caractérisé en ce que le tamis de formation (22) est guidé à travers une fente de pré-pressage (10) avant la délivrance de la bande de matière fibreuse (1), conjointement avec une bande d'égouttage (23) absorbant l'eau et circulant sans fin et la bande de matière fibreuse (1) située entre elles.
EP17811885.7A 2016-12-05 2017-11-28 Ensemble de pressage Active EP3548664B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102016123433.8A DE102016123433B4 (de) 2016-12-05 2016-12-05 Pressanordnung
PCT/EP2017/080668 WO2018104110A1 (fr) 2016-12-05 2017-11-28 Ensemble de pressage

Publications (2)

Publication Number Publication Date
EP3548664A1 EP3548664A1 (fr) 2019-10-09
EP3548664B1 true EP3548664B1 (fr) 2023-03-08

Family

ID=60654938

Family Applications (1)

Application Number Title Priority Date Filing Date
EP17811885.7A Active EP3548664B1 (fr) 2016-12-05 2017-11-28 Ensemble de pressage

Country Status (5)

Country Link
EP (1) EP3548664B1 (fr)
CN (1) CN109996922B (fr)
DE (1) DE102016123433B4 (fr)
FI (1) FI3548664T3 (fr)
WO (1) WO2018104110A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102019119905A1 (de) * 2019-07-23 2021-01-28 Voith Patent Gmbh Schuhpresse
DE102020101913A1 (de) * 2020-01-28 2021-07-29 Voith Patent Gmbh Vorrichtung zur Herstellung von White Top Kraftliner und Verwendung dieser Vorrichtung zur Herstellung von White Top Kraftliner
DE102022127695A1 (de) 2022-10-20 2024-02-29 Voith Patent Gmbh Maschine und Verfahren zur Herstellung oder Behandlung einer Wellpappenrohpapierbahn mit verkürzten Trockensieben
DE102023101607A1 (de) 2023-01-24 2024-03-07 Voith Patent Gmbh Maschine zur Herstellung oder Behandlung einer Faserstoffbahn
DE102023101610A1 (de) 2023-01-24 2024-06-13 Voith Patent Gmbh Maschine und Verfahren zur Herstellung oder Behandlung einer Faserstoffbahn

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4483745A (en) * 1982-09-29 1984-11-20 Beloit Corporation Method and apparatus of sheet transfer using a nonporous smooth surfaced belt
FI82500C (fi) * 1985-02-18 1991-03-11 Valmet Oy Pressparti med separata pressnyp i en pappersmaskin.
DE10210169A1 (de) * 2002-03-07 2003-09-18 Voith Paper Patent Gmbh Pressanordnung
DE102004021051B3 (de) * 2004-04-29 2005-11-10 Infineon Technologies Ag DRAM-Speicherzellenanordnung nebst Betriebsverfahren
DE102007021051A1 (de) * 2007-05-04 2008-11-06 Voith Patent Gmbh Pressanordnung
FI121146B (fi) * 2008-06-19 2010-07-30 Metso Paper Inc Rainanmuodostuskone ja menetelmä rainanmuodostuskoneessa
CA2858677C (fr) * 2011-12-08 2021-07-06 Voith Patent Gmbh Machine de production de bande de matiere fibreuse, notamment de papier ouat

Also Published As

Publication number Publication date
DE102016123433B4 (de) 2019-01-10
CN109996922A (zh) 2019-07-09
WO2018104110A1 (fr) 2018-06-14
FI3548664T3 (fi) 2023-06-05
CN109996922B (zh) 2020-12-25
EP3548664A1 (fr) 2019-10-09
DE102016123433A1 (de) 2018-06-07

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