EP1072721B1 - Machine à papier - Google Patents

Machine à papier Download PDF

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Publication number
EP1072721B1
EP1072721B1 EP00106510A EP00106510A EP1072721B1 EP 1072721 B1 EP1072721 B1 EP 1072721B1 EP 00106510 A EP00106510 A EP 00106510A EP 00106510 A EP00106510 A EP 00106510A EP 1072721 B1 EP1072721 B1 EP 1072721B1
Authority
EP
European Patent Office
Prior art keywords
press
fibrous web
machine according
roll
drying
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.)
Expired - Lifetime
Application number
EP00106510A
Other languages
German (de)
English (en)
Other versions
EP1072721A3 (fr
EP1072721A2 (fr
Inventor
Thomas Dr. Elenz
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 Paper 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
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Application filed by Voith Paper Patent GmbH filed Critical Voith Paper Patent GmbH
Publication of EP1072721A2 publication Critical patent/EP1072721A2/fr
Publication of EP1072721A3 publication Critical patent/EP1072721A3/fr
Application granted granted Critical
Publication of EP1072721B1 publication Critical patent/EP1072721B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • D21F3/045—Arrangements thereof including at least one extended press nip
    • 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
    • D21F9/02—Complete machines for making continuous webs of paper of the Fourdrinier type

Definitions

  • the invention relates to a machine for producing and / or thickening a fibrous web with a press section for dewatering this, an upstream former for sheet formation and a downstream dryer section for drying the fibrous web.
  • Such machines are described for example in EP 770 727, wherein the fibrous web is passed through at least two extended press nips of the press section together with a plurality of press felts. Due to the fact that the fibrous web comes into contact with various press felts in the press nips, irregularities in the water absorption capacity or the moisture content of the press felts across the fibrous web can be better compensated for. As a result, the moisture transverse profile of the fibrous web is relatively balanced.
  • the disadvantage here is the large space requirement and the relatively high production cost of the two extended press nips, which are formed with the participation of relatively expensive shoe press rolls.
  • the object of the invention is therefore to provide a paper machine with as small as possible, yet efficient and with the least possible effort associated press section.
  • the press section consists of only one, formed by two press rolls press nip through which next to the fibrous web, arranged on both sides of this, in each case at least one press felt is guided in the former, the dewatering of the fibrous web to a rock content of at least 18 %, preferably at least 20% ensuring means are arranged
  • the first dryer section of the dryer section consists of at most 3 heated drying cylinders, which are partially looped by the fibrous web and the fibrous web from the former to the end of the first dryer group constantly from at least one roll or a band in Form of a forming wire, a press felt, a transfer belt or a Drying screen is supported.
  • the dry content of at least 18%, preferably at least 20% after the former allows the restriction to only one extended press nip in the press section. Because of the nevertheless relatively high moisture content of the fibrous web after the press nip, a closed guidance of the fibrous web from the former is particularly important until the end of the first drying group, especially at high machine speeds. In addition, stretching of the fibrous web must be compensated as quickly as possible due to the high moisture content at the beginning of the dryer section, so at least the first dryer group is designed as short as possible. Otherwise, there is a risk of web breaks or wrinkles. A compensation of the stretch is generally achieved in that the respective following drying group is operated at a higher speed than the previous one.
  • the length of the press nip should be greater than 300 mm, preferably greater than 500 mm.
  • the web speed should not exceed 1500 m / min.
  • the line force in the press nip should be above 800 kN / m, preferably above 1000 kN / m and in particular above 1200 kN / m. As a result, press pulses of more than 60 kPa s can be achieved.
  • At least one suction device should be arranged in the former before the transfer point of the fibrous web to the press section, which sucks through the forming wire, the water from the fibrous web.
  • the fibrous web is passed together with at least one endlessly circulating, water-receptive and / or water-permeable belt through a pre-press nip preferably formed by two rolls ,
  • a pre-press nip preferably formed by two rolls
  • the forming wire as a water-permeable belt should wrap around the evacuated roll.
  • At least one roll in the form of a press roll should also be looped around by a water-absorptive tape in the form of a press felt.
  • a moistening device should preferably be present in the form of a steam blow box for influencing the moisture transverse profile of the fibrous web.
  • sensors for detecting the moisture transverse profile of the fibrous web should be arranged at least in the press section or a following unit, which act at least on the moistening. The results of these sensors can also be used to control the suction device and / or the pressing forces in the pre-press nip in the former.
  • the moistening device but preferably also the suction device and / or the pressing forces can be controlled separately in zones across the fibrous web.
  • the fibrous web should leave the press nip horizontally or downwards inclined and at least over the upper press felt a gutter for collecting the thrown off from the upper press roll water can be arranged.
  • At least the first drying group should be designed very short, preferably at most 2, in particular at most one heated drying cylinder.
  • FIG. 1 shows a schematic section of a paper machine for producing a wood-free paper web with a finished basis weight between 50 and 100 g / m 2 .
  • the fibrous web 1 is guided by a water-permeable forming wire 10 guided to the transfer point to the press section 4.
  • the fibrous web 1 is dewatered to a dry content of at least 20%.
  • the fibrous web 1 is guided together with the forming wire 10 and a water-receptive press felt 19 through a pre-press nip 16 formed by an evacuated roll 17 and a press roll 18.
  • the water is sucked through the water-permeable belt 15 in the form of Formersiebes 10 in a suction device 12 in the form of the evacuated roller 17.
  • the squeezed out water is taken up by the water-absorptive band 15 in the form of the press felt 19 and transported away.
  • each press roll 5 is looped by an endlessly circulating press felt 6.7.
  • the fibrous web 1 is transferred from the forming wire 10 to the upper press felt 6, which is supported by an evacuated guide roll 22 of the upper press felt 6.
  • both press felts 6.7 are brought together, the lower press felt 7 via a humidifier 13th guided in the form of a steam blower box, the water vapor is used to influence the moisture profile of the fibrous web 1.
  • the lower press felt 7 is separated with the fibrous web 1 from the upper press felt 6, which is supported by a separating sucker 24. Subsequently, the fibrous web 1 is transferred to the dryer fabric 10 of the first drying group 8, which is also supported by a suctioned guide roll 22 of the dryer fabric 11.
  • the upper press felt 6 Since much water is obtained in the single press nip of the press section 4, the upper press felt 6 leaves the press nip inclined downwards so that there is plenty of room for a channel 20 for catching the thrown-off water of the upper press roll 5. Of course, a gutter can also be used under the lower press roll 5. After the press nip or the delivery of the fibrous web 1 both press felts must be 6.7 cleaned by conditioning 21 and dried.
  • the first drying group 8 consists only of a heated drying cylinder 9, over which the fibrous web 1 is guided, wherein the fibrous web 1 is pressed by the drying wire 11 of this drying group 8 against the drying cylinder 9.
  • the fibrous web 1 is always supported by a roller or a belt, so that a safe run of the fibrous web 1 is ensured even at high speeds.
  • the generally endless circulating belts are guided over normal 23 or evacuated guide rollers 22.
  • the fibrous web 1 is removed from the dryer fabric 11 of the following drying group, of course, before the drying wire 11 of the first drying group 8 has been led away.
  • This transfer makes it possible to drive a higher speed in the second dryer group than in the first dryer group 8. As a result, elongations of the fibrous web 1 can be avoided Wrinkling and breaks are compensated.
  • the fibrous web 1, together with the drying wire 11 of the respective drying group is guided in an analogous manner alternately over drying cylinders 9 and suctioned guide rolls 22.
  • the moisture transverse profile of the fibrous web 1 is measured here by sensors 14, for example in the peripheral region of an evacuated guide roller 22.
  • the result of this measurement is used in the control of the moistening device 13, the vacuum level of the suction roller 17 as well as the pressing forces emanating from the pressure roller 18.
  • the humidification, suction and pressure in zones across the fibrous web are separately controllable. This allows the production of the most uniform moisture profile of the fibrous web 1 even with only one press nip in the press section. 4
  • the press nip itself is formed by a cylindrical lower press roll 5 and an upper shoe press roll 5, wherein the shoe press roll 5 consists of a flexible press jacket, which it is guided over a pressure shoe with concave contact surface. This allows the formation of long press nips over 300 mm in length.
  • the line force in the press nip is above 1000 kN / m and the web speed at 1200 m / min.

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  • Paper (AREA)

Claims (15)

  1. Machine de fabrication et/ou d'anoblissement d'une nappe fibreuse (1) comprenant une section de pressage (4) pour l'égouttage de cette nappe, un formeur (2) monté avant pour la formation de feuille et une section de séchage (3) placée après pour le séchage de la nappe fibreuse (1),
    caractérisée en ce que
    la section de pressage (4) se compose d'une seule fente de pressage formée par deux rouleaux de pressage (5), à travers laquelle est guidé, outre la nappe fibreuse (1), au moins un feutre de pressage (6, 7) respectif, disposé de part et d'autre de celle-ci,
    des moyens garantissant l'égouttage de la nappe fibreuse à une teneur en matière sèche d'au moins 18%, de préférence d'au moins 20%, sont disposés dans le formeur (2), le premier groupe de séchage (8) de la section de séchage (3) se compose d'au maximum 3 cylindres de séchage chauffés (9), qui sont entourés partiellement par la nappe fibreuse (1) et la nappe fibreuse (1) est supportée depuis le formeur (2) jusqu'à l'extrémité du premier groupe de séchage (8) de manière constante par au moins un rouleau ou une bande.
  2. Machine selon la revendication 1, caractérisée en ce que la longueur de la fente de pressage est supérieure à 300 mm, de préférence supérieure à 500 mm.
  3. Machine selon la revendication 1 ou 2, caractérisée en ce que la force linéaire dans la fente de pressage est supérieure à 800 kN/m, de préférence supérieure à 1000 kN/m, et notamment supérieure à 1200 kN/m.
  4. Machine selon l'une quelconque des revendications précédentes, caractérisée en ce qu'au moins un dispositif d'aspiration (12) garantissant une teneur en matières sèches d'au moins 18%, de préférence d'au moins 20%, est disposé dans le formeur (2) avant le point de transfert de la nappe fibreuse (1) à la section de pressage (4).
  5. Machine selon l'une quelconque des revendications précédentes, caractérisée en ce que la nappe fibreuse (1), conjointement avec au moins une bande (15) entraînée sans fin, capable d'absorber l'eau et/ou perméable à l'eau, est guidée à travers une fente de pré-pressage (16) formée de préférence par deux rouleaux, dans le formeur (2) avant le point de transfert de la nappe fibreuse (1) à la section de pressage (4).
  6. Machine selon la revendication 5, caractérisée en ce que la fente de pré-pressage (16) est formée par deux rouleaux sous la forme d'un rouleau aspiré (17) et d'un rouleau de pressage (18) et la bande perméable à l'eau (15) est formée par la toile de formage (10) entourant le rouleau aspiré (17).
  7. Machine selon la revendication 5 ou 6, caractérisée en ce qu'au moins un rouleau sous la forme d'un rouleau de pressage (18) est entouré par une bande capable d'absorber l'eau (15) sous la forme d'un feutre de pressage (19).
  8. Machine selon l'une quelconque des revendications précédentes, caractérisé en ce qu'un dispositif d'humidification (13), de préférence sous la forme d'une caisse soufflante à vapeur pour influencer le profil transversal d'humidité de la nappe fibreuse (1), est prévu dans la section de pressage (4) avant la fente de pressage.
  9. Machine selon la revendication 8, caractérisée en ce que des capteurs (14) pour détecter le profil transversal d'humidité de la nappe fibreuse (1) sont disposés dans la section de pressage (4) et/ou une unité suivante, de préférence dans la section de séchage (3), lesquels agissent au moins sur le dispositif d'humidification (13).
  10. Machine selon la revendication 9, caractérisée en ce que les capteurs (14) agissent aussi sur le dispositif d'aspiration (12) et/ou sur la fente de pré-pressage (16) dans le formeur (2).
  11. Machine selon l'une quelconque des revendications précédentes, caractérisée en ce que la nappe fibreuse (1) quitte la fente de pressage entre les feutres de pressage (6, 7) horizontalement ou suivant une inclinaison vers le bas, et au moins sur le feutre de pressage supérieur (6), on prévoit une rigole (20) pour capter l'eau éjectée du rouleau de pressage supérieur (5).
  12. Machine selon l'une quelconque des revendications précédentes, caractérisée en ce que le premier groupe de séchage (8) se compose d'au maximum 2, de préférence de seulement un cylindre de séchage chauffé (9).
  13. Machine selon l'une quelconque des revendications précédentes, caractérisée en ce qu'elle est appropriée pour la fabrication d'une nappe fibreuse (1) ayant un grammage compris entre 50 et 200 g/m2, de préférence entre 50 et 100 g/m2.
  14. Machine selon l'une quelconque des revendications précédentes, caractérisée en ce qu'elle est appropriée pour la fabrication d'une nappe de papier exempte de bois.
  15. Machine selon l'une quelconque des revendications précédentes, caractérisée en ce que la vitesse de la nappe ne dépasse pas 1500 m/min.
EP00106510A 1999-07-24 2000-03-25 Machine à papier Expired - Lifetime EP1072721B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19934875A DE19934875A1 (de) 1999-07-24 1999-07-24 Papiermaschine
DE19934875 1999-07-24

Publications (3)

Publication Number Publication Date
EP1072721A2 EP1072721A2 (fr) 2001-01-31
EP1072721A3 EP1072721A3 (fr) 2001-08-22
EP1072721B1 true EP1072721B1 (fr) 2006-06-28

Family

ID=7915994

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00106510A Expired - Lifetime EP1072721B1 (fr) 1999-07-24 2000-03-25 Machine à papier

Country Status (5)

Country Link
US (1) US6638395B1 (fr)
EP (1) EP1072721B1 (fr)
JP (1) JP4717985B2 (fr)
CA (1) CA2314347C (fr)
DE (2) DE19934875A1 (fr)

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DE102011005747A1 (de) 2011-03-18 2012-09-20 Voith Patent Gmbh Blattbindungsvorrichtung
DE102011081239A1 (de) 2011-08-19 2013-02-21 Voith Patent Gmbh Blattbildungsvorrichtung
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DE102011082346A1 (de) 2011-09-08 2013-03-14 Voith Patent Gmbh Pressenpartie einer Maschine zur Herstellung einer Faserstoffbahn und Verfahren zum Betrieb der Pressenpartie
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JP5818607B2 (ja) * 2011-09-27 2015-11-18 デュプロ精工株式会社 抄紙装置
JP6439347B2 (ja) * 2014-09-25 2018-12-19 セイコーエプソン株式会社 シート製造装置
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CN107627670A (zh) * 2017-08-28 2018-01-26 芜湖润林包装材料有限公司 一种纸护角毛坯板合成机
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Also Published As

Publication number Publication date
CA2314347A1 (fr) 2001-01-24
CA2314347C (fr) 2008-12-30
DE50013082D1 (de) 2006-08-10
JP2001049589A (ja) 2001-02-20
EP1072721A3 (fr) 2001-08-22
US6638395B1 (en) 2003-10-28
EP1072721A2 (fr) 2001-01-31
JP4717985B2 (ja) 2011-07-06
DE19934875A1 (de) 2001-01-25

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