EP2314763B1 - Dispositif destiné au traitement d'une bande de matière fibreuse - Google Patents

Dispositif destiné au traitement d'une bande de matière fibreuse Download PDF

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Publication number
EP2314763B1
EP2314763B1 EP20100169353 EP10169353A EP2314763B1 EP 2314763 B1 EP2314763 B1 EP 2314763B1 EP 20100169353 EP20100169353 EP 20100169353 EP 10169353 A EP10169353 A EP 10169353A EP 2314763 B1 EP2314763 B1 EP 2314763B1
Authority
EP
European Patent Office
Prior art keywords
pressure element
shoe
pressure
fibrous web
web
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
EP20100169353
Other languages
German (de)
English (en)
Other versions
EP2314763A1 (fr
Inventor
Shulei Dr.-Ing. Zhao
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
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Filing date
Publication date
Application filed by Voith Patent GmbH filed Critical Voith Patent GmbH
Publication of EP2314763A1 publication Critical patent/EP2314763A1/fr
Application granted granted Critical
Publication of EP2314763B1 publication Critical patent/EP2314763B1/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
    • D21F3/00—Press section of machines for making continuous webs of paper
    • D21F3/02—Wet presses
    • D21F3/0209—Wet presses with extended press nip
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G1/00—Calenders; Smoothing apparatus
    • D21G1/006—Calenders; Smoothing apparatus with extended nips

Definitions

  • the invention relates to a device for treating a fibrous web, in which it can be pressed against a heatable counter-pressure element, in particular a heatable roller with a circumferential jacket or a circulating belt, wherein the contact pressure can be applied by a shoe, with a contact surface from the inside against the sheath or the band acts, whereby the sheath or the band with the counter roll form a contact zone for the fibrous web, which contact zone in the direction of the fibrous web has a length of at least 100 mm and varies over the length of the contact pressure.
  • a heatable counter-pressure element in particular a heatable roller with a circumferential jacket or a circulating belt
  • the contact pressure can be applied by a shoe, with a contact surface from the inside against the sheath or the band acts, whereby the sheath or the band with the counter roll form a contact zone for the fibrous web, which contact zone in the direction of the fibrous web has a length of at least 100 mm and varies over the length of
  • Such a device is widely used for dewatering or calendering of paper or board webs.
  • a change in the pressure curve in the running direction of the fibrous web is generated for example by tilting the shoe. From the DE 4410129 It is known to curve the shoe to vary the pressure curve.
  • the length of the contact zone comprises a at the beginning longer, at least over half reaching heating section with low pressure and at least one following very short pulse path of high pressure.
  • the heating section is dimensioned and designed in terms of temperature so that the surface of the web reaches the Tg point, ie the melting temperature of the fibers.
  • the interior of the railway in the thickness direction it essentially retains the temperature with which it entered the device.
  • the pulse path is designed so that the surface is compacted and smoothed to the desired extent in it. This design is easy for a person skilled in the art, because the momentum corresponds to that in a conventional calender nip. Should he not be known for certain types of fibrous webs, he is in a simple way in the attempt to clarify.
  • the low pressure of the heating section is less than 2 MPa.
  • the energy input in the form of pressure in the device is kept small in this way. In this case, a pressure of less than 2 MPa is sufficient to ensure the necessary heat transfer. Care should be taken that the surface temperature of the counter-pressure element, in particular a heating roller, is better than 180 ° C, at least above 150 ° C.
  • the pulse path is determined by an additional pressure element, which is in communication with the shoe.
  • the heating section and the pulse path are thus united in the one shoe.
  • the total shoe length in the direction of the fibrous web of more than 100 mm is divided so that the first and by far the largest part serves to heat the web.
  • the web is acted upon by an additional pressure element with a pulse, which makes the final and final compression.
  • the pressure element is arranged in the running direction of the fibrous web at the end of the shoe.
  • the pressure element is mounted in the contact surface of the shoe. This ensures a stable position of the usually narrow compared to the dimensions of the shoe pressure element.
  • the pressure element is a rotational body.
  • the sliding over the pressure element jacket or the belt running over it is thereby subjected to a significantly lower wear, since the rotational body with a peripheral speed of the same order of magnitude we can turn the belt or the shell. A rubbing relative movement is thus avoided. This increases the service life of the belt or jacket.
  • the rotational body is mounted in a storage space on a lubricating film and can rotate freely.
  • the lubricating film is pressed under pressure into a space in the shoe, in which the rotational body is mounted.
  • the rotating body can rotate freely there without friction stress fluid-bearing.
  • the pressure element extends over the width of the fibrous web. It may be in connection with a sheet-wide shoe or extend over several axially adjacent shoes. The fact that the pressure element extends across the width of the web, it is ensured that the pressure pulse across the entire web is the same and not interrupted. In this way, a qualitatively uniformly compressed and smoothed fibrous web is produced.
  • the pressure element or at least a part thereof protrudes 0.001 to 1 mm beyond the contact surface in the direction of the belt or jacket.
  • a supernatant in this size range has proven to be effective.
  • the high pressure of the pulse path is higher than 10 MPa. Then, the operator of the device according to the invention achieves a calendering of the fibrous web, which would otherwise be producible only with a multi-roll calender.
  • the figure shows a schematic sectional view of a device according to the invention for treating a fibrous web.
  • the device 1 has a shoe 2 and a counter-pressure element 3.
  • the counter-pressure element 3 is in this embodiment, a heated to above 150 ° C, preferably to about 180 ° C roller.
  • the shoe has a contact surface 10 which is concavely curved to the contour of the counter-pressure element 3.
  • the shoe 2 is able to press a circulating belt or a circumferential jacket 4 against the counter-pressure element. The possibilities of pressing such shoes are known in the art and need not be further explained here.
  • the fibrous web 5 is treated under pressure and temperature influence.
  • the directions of movement of the belt or casing 4, counter-pressure element 3 and fibrous web 5 are indicated by arrows in the figure.
  • a lubricant supply 9 is provided, which introduces lubricant into the gap between jacket or band 4 and shoe 2.
  • nozzles are provided which provide a hydrodynamic lubricant film.
  • the invention also does not exclude to hydrostatically lubricate the shoe surface in a known manner.
  • the heating path which extends at least over the first half of the contact surface 10 of the shoe 2, the web is applied against the heated counter-pressure element 3 with a moderate pressure below 2 MPa.
  • the heating section 11 should therefore be at least 50 mm long.
  • the surface of the web 5 is heated so that you can easily smooth and compact.
  • the exposure time is calculated precisely so that the interior of the web 5 substantially retains its inlet temperature before entering the device 1, before the web 5 enters the downstream pulse path 12.
  • the pulse path has a pressure element 6, which exerts an increased pressure pulse on the belt or the jacket 4.
  • the pressure element 6 can extend over the web width and protrudes slightly from the contact surface 10.
  • the pressure pulse is transmitted through the jacket or the band to the paper web 5, which is pressed at this point with a pressure greater than 10 MPa against the counter-pressure element 3. As a result, the web is compressed on its surface and smoothed.
  • the storage space 8 corresponds to a longitudinally-cut cylinder cavity, the inner diameter of which is only slightly larger than the outer diameter of the rotational body.
  • the calendering process can be assisted by moistening devices (steam, nozzle moistener) in front of the device 1 according to the invention.

Landscapes

  • Paper (AREA)
  • Treatment Of Fiber Materials (AREA)

Claims (10)

  1. Dispositif pour le traitement d'une bande de matière fibreuse (5), dans lequel celle-ci peut être pressée au moyen d'une enveloppe périphérique ou d'une bande périphérique (4) contre un élément de pression conjugué chauffable (3), la pression d'application pouvant être appliquée par un sabot (2) qui agit avec une surface d'appui (10) depuis l'intérieur contre l'enveloppe ou la bande (4), de sorte que l'enveloppe ou la bande (4) forment avec le rouleau conjugué (3) une zone de contact (13) pour la bande de matière fibreuse (5), ladite zone de contact (13) présentant dans la direction d'avance de la bande de matière fibreuse (5) une longueur d'au moins 100 mm et la pression d'application variant sur sa longueur,
    caractérisé en ce que la longueur de la zone de contact (13) comprend une section de chauffage (11) initialement plus longue, s'étendant au moins sur la moitié, de faible pression, et au moins une section d'impulsion suivante très courte (12), de pression élevée.
  2. Dispositif selon la revendication 1,
    caractérisé en ce que la faible pression de la section de chauffage (11) est inférieure à 2 MPa.
  3. Dispositif selon l'une quelconque des revendications 1 ou 2,
    caractérisé en ce que la section d'impulsion (12) est déterminée par un élément de pression supplémentaire (6) qui est en liaison avec le sabot (2).
  4. Dispositif selon la revendication 3,
    caractérisé en ce que
    l'élément de pression supplémentaire (6) est disposé dans la direction d'avance de la bande de matière fibreuse (5) à l'extrémité du sabot (2).
  5. Dispositif selon la revendication 3,
    caractérisé en ce que l'élément de pression supplémentaire (6) est supporté dans la surface d'appui (10) du sabot (2).
  6. Dispositif selon la revendication 4 ou 5,
    caractérisé en ce que l'élément de pression supplémentaire (6) est un corps de révolution.
  7. Dispositif selon la revendication 6,
    caractérisé en ce que le corps de révolution est supporté dans un espace de palier (8) sur un film lubrifiant et peut tourner librement.
  8. Dispositif selon l'une quelconque des revendications 3 à 7,
    caractérisé en ce que l'élément de pression supplémentaire (6) s'étend sur la largeur de la bande de matière fibreuse (5).
  9. Dispositif selon l'une quelconque des revendications 3 à 8,
    caractérisé en ce que l'élément de pression supplémentaire (6) ou au moins une partie de celui-ci fait saillie sur 0,001 à 1 mm au-delà de la surface d'appui (10) dans la direction de la bande ou de l'enveloppe (4).
  10. Dispositif selon l'une quelconque des revendications 1 à 9,
    caractérisé en ce que la pression élevée de la section d'impulsion (12) est supérieure à 10 MPa.
EP20100169353 2009-09-15 2010-07-13 Dispositif destiné au traitement d'une bande de matière fibreuse Not-in-force EP2314763B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200910029482 DE102009029482A1 (de) 2009-09-15 2009-09-15 Vorrichtung zur Behandlung einer Faserstoffbahn

Publications (2)

Publication Number Publication Date
EP2314763A1 EP2314763A1 (fr) 2011-04-27
EP2314763B1 true EP2314763B1 (fr) 2012-06-27

Family

ID=43603128

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20100169353 Not-in-force EP2314763B1 (fr) 2009-09-15 2010-07-13 Dispositif destiné au traitement d'une bande de matière fibreuse

Country Status (2)

Country Link
EP (1) EP2314763B1 (fr)
DE (1) DE102009029482A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202016106942U1 (de) 2016-02-11 2017-01-02 Voith Patent Gmbh Vorrichtung zur Behandlung einer Faserstoffbahn

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI71369C (fi) * 1983-03-23 1986-12-19 Valmet Oy Laongnyppress foer pappersmaskin
DE4410190A1 (de) 1994-03-24 1995-09-28 Blohm Voss Ag Grätinge für gekühlte Laderäume in Schiffen
DE19544979B4 (de) * 1995-12-01 2006-08-03 Voith Paper Patent Gmbh Vorrichtung zum Komprimieren, Glätten und/oder Entwässern einer Faserstoffbahn
DE102006001021A1 (de) * 2006-01-07 2007-07-12 Voith Patent Gmbh Mattsatinage

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202016106942U1 (de) 2016-02-11 2017-01-02 Voith Patent Gmbh Vorrichtung zur Behandlung einer Faserstoffbahn

Also Published As

Publication number Publication date
DE102009029482A1 (de) 2011-03-24
EP2314763A1 (fr) 2011-04-27

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