EP1445377B1 - Calandre à pinçage allongé - Google Patents

Calandre à pinçage allongé Download PDF

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Publication number
EP1445377B1
EP1445377B1 EP03027128A EP03027128A EP1445377B1 EP 1445377 B1 EP1445377 B1 EP 1445377B1 EP 03027128 A EP03027128 A EP 03027128A EP 03027128 A EP03027128 A EP 03027128A EP 1445377 B1 EP1445377 B1 EP 1445377B1
Authority
EP
European Patent Office
Prior art keywords
fibrous web
dust
dust removal
removal device
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.)
Expired - Fee Related
Application number
EP03027128A
Other languages
German (de)
English (en)
Other versions
EP1445377A1 (fr
Inventor
Rüdiger Dr.-Ing. Kurtz
Josef Schneid
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 EP1445377A1 publication Critical patent/EP1445377A1/fr
Application granted granted Critical
Publication of EP1445377B1 publication Critical patent/EP1445377B1/fr
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • 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 flat-nip calender with a rotating shell and a contact shoe having shoe roll and a counter-pressure element, which together form a broad nip through which a web running path of a fibrous web.
  • a wide-nip calender is used to load a fibrous web, such as a paper or board web, at elevated pressure and typically at an elevated temperature.
  • the wide-nip calender has the advantage over a calender, which is formed by two counter-acting rollers, that the treatment time of the fibrous web is longer, but the compressive stresses in the nip can be kept smaller than in a nip between two rolls. This makes it possible to achieve a volume-saving calendering of the fibrous web, ie the thickness of the fibrous web is not reduced as much in the nip as in a nip between two rolls.
  • GB 1 127 897 shows a calender with four rollers, which form nips between them.
  • On the rollers are each rotating brushes, which are driven by belts from the rollers and indeed with the same direction of rotation, but a much larger peripheral speed.
  • the surfaces of the brushes and the rollers therefore rotate in the opposite direction at the point of contact.
  • the brushes are provided on the one hand to clean off the surface of the rolls, but on the other hand also to prevent the web from winding around the corresponding rolls in the event of a web break.
  • US 6,148,831 shows a method for cleaning a web, in which dust, which could occur in particular in a cutting device is detached by an air jet from the surface of a web and then sucked through a suction channel.
  • WO 97/31151 A1 shows a cutting device through which a web is guided, wherein the web supports in front of and behind the cutting device by two rollers is.
  • the rollers and the cutter located therebetween are covered by a housing having at the output end a blowing device, with which a jet of jet is directed onto the surface of the web, in order to remove dust which may arise during cutting.
  • the dust is then sucked out of the interior of the housing by means of a suction device.
  • the invention is based, to maintain the quality of the fibrous web over a longer period the task.
  • This object is achieved in a wide-nip calender of the type mentioned above in that at the exit of the broad nip in the opening gusset between the fibrous web and the jacket, a dust removal device is arranged.
  • the quality deterioration of the fibrous web is attributed to the fact that particles are released from the surface of the fibrous web by the relative movement or shearing forces in the nip. These particles lead to corresponding dust deposits on the jacket. Dust deposits on the jacket lead to a change in the surface of the jacket, which can have a negative effect on the quality of the fibrous web, in particular on the quality of the surface. In addition, some dust particles will certainly remain on the surface of the fibrous web, which then deposit in downstream facilities and there lead to increasing pollution. A pollution in downstream facilities can also cause the quality of the surface of the fibrous web decreases. In the simplest case, these devices can be deflection rollers over which the fibrous web is guided. The dust removal device will now eliminate at least some of these problems.
  • the detached from the surface of the fibrous web particles which are referred to as "dust" for short, can be removed by means of the dust removal device, so that the contamination is avoided or at least reduced.
  • the pollution does not lead so much to a reduction in quality of the fibrous web.
  • the dust removal device is arranged between the fibrous web and the jacket. It is believed that most of the dust is produced by the relative movement between the fibrous web and the jacket. Perhaps this is because the counter-pressure element, which is usually designed as a roller, especially as a heating roller, has a smoother surface with which less particles are dissolved out of the surface of the fibrous web. Most of the dust is created between the mantle and the fibrous web. If you place the dust remover here, then most of the dust will be removed.
  • the dust removal device has a suction device.
  • the dust removal device thus operates on the classic principle of a "vacuum cleaner", in which a part of the dust on the Output of the wide nip is present, can be sucked off.
  • the suction device has a directed into the gusset between the fibrous web and the jacket suction nozzle element. So you can start with the suction, shortly after the fibrous web has been released from the mantle. In this case, the distance between the jacket and the fibrous web is still relatively small. Accordingly, it can be assumed that the "dust density" in this area is still relatively large. By separating the fibrous web and the jacket, the dust is whirled up, i. at least part of the dust is in the air, where it can be easily extracted.
  • the suction nozzle element preferably has a first wall facing the fibrous web and a second wall facing the jacket, wherein a plurality of suction openings are provided in at least one wall. These suction holes are then directed to a surface from where the dust can be extracted with increased intensity.
  • a surface cleaning arrangement is arranged on the fibrous web and / or on the jacket.
  • a surface cleaning assembly is capable of removing even dust adhering to a surface. It is not limited to removing the dust that is in the air at the exit of the broad nip. This avoids that dust, for example, to adhering to the surface of the fibrous web, is carried in downstream facilities.
  • the surface cleaning arrangement comprises a mechanical dust removal device.
  • the mechanical dust removal device is able to dissolve the dust from the surface to be cleaned. Once the dust has been released from the surface to be cleaned, it can be removed, for example via the suction device. Of course, it is also possible to provide further dust removal means.
  • the dust removal device comprises a compressed air jet.
  • a jet of compressed air which is directed at the surface of the fibrous web or on the jacket, is able to peel off a dust deposit, so to speak. The stress on the fibrous web or the jacket remains small.
  • the dust removal device has a relative to the surface to be cleaned movable brush.
  • the brush then literally brushes off the fibrous web or sheath.
  • a wiping element made of a textile material.
  • the dust removal device has a suction device.
  • a suction device can be used together with the compressed air jet or the brush can be used. With the suction device of the detached dust from other elements is removed. Under certain circumstances, however, the suction device alone is able to remove the adhering to the surface of the fibrous web or the surface of the shell dust.
  • the surface cleaning arrangement preferably has an ionization device. With the aid of the ionization device, it is possible to achieve an electrostatic discharge of the fibrous web or the roll surface, so that the holding forces of the dust on the respective surface are reduced.
  • the ionization device is arranged in the web running direction in front of the dust removal device. So you first reduces the holding forces between the dust and the surface to be cleaned and then removes the dust by mechanical means.
  • a Breitnipkalander 1 has a shoe roll 2 with a circumferential jacket 3 and a pressure shoe 4.
  • the jacket 3 cooperates with a counter-pressure element 5, which is formed in the present case as a roller and as a thermal roll.
  • the counter-pressure element 5 is heated by a heating device, not shown.
  • the shoe roll 2 is shown here with a relatively thick casing 3, which rotates in the manner of a roller and is usually completed at its end faces with end plates. But it is also possible to make the jacket 3 thinner and to circulate in the manner of a band over several support rollers.
  • the pressure shoe 4 has a pressure surface 6, which is adapted to the curvature of the counter-pressure element substantially, of course, the thickness of the shell 3 must be considered. However, an exact match between the curvature of the pressure surface 6 and the curvature of the counter-pressure element 5 is usually not required.
  • the pressure surface 6 means for reducing friction between the shell 3 and the pressure shoe 4 may be provided in a conventional manner, for example outlet nozzles of a hydrostatic lubrication.
  • the jacket 3 forms, together with the counter-pressure element 5, a broad nip 7, through which a fibrous web 8, for example a paper or board web, is guided.
  • a fibrous web 8 for example a paper or board web
  • the treatment time of the fibrous web 8 in the nip 7 depends on the length of the broad nip 7 in the running direction of the web, which is represented by an arrow 9.
  • particles can be dissolved out of the surface of the fibrous web 8. Also, relative movements between the fibrous web 8 and the shell 3 can lead to the dissolution of such particles.
  • These particles can have a wide variety of compositions. For example, coated papers can also be parts of the stroke. The detached particles are therefore briefly summarized as "dust".
  • a dust removal device 11 is arranged at the outlet 10 of the wide nip 7.
  • the dust removal device is arranged in the opening gusset between the fibrous web 8 and the shell 3. It is believed that less dust is produced at the counter-pressure element 5, whose surface is substantially smoother than the surface of the jacket 3.
  • the dust removal device 11 initially has an extraction device 12, which is directed into the opening gusset between the fibrous web 8 and the jacket 3 at the exit of the broad nip 7.
  • the suction device has a wedge-shaped suction nozzle element 13.
  • the suction nozzle element 13 has a fibrous web 8 facing the first wall 14 and a jacket 3 facing the wall 15.
  • In the first wall suction openings 16 are provided.
  • In the second wall suction openings 17 are provided.
  • the suction openings 16 suck dust, which is "swirled up" by the surface of the fibrous web 8, so after leaving the broad nip 7 in the air at the exit of the broad nip 10 is.
  • the suction openings 17 in the second wall 15 suck the dust which is whirled up from the surface of the jacket 3.
  • a surface cleaning device 18 is provided for the casing 3 and a surface cleaning device 19 for the fibrous web 8.
  • the surface cleaning device 18 has an ionization device 20 with which the surface of the casing 3 can be electrically discharged. As a result, holding forces between the dust and the jacket 3 are reduced.
  • Downstream of the ionization device 20 is a mechanical dust removal device 21.
  • the dust removal device 21 is shown enlarged in FIG. It has a circumferential brush 22. Instead of a circulating brush 22, it is also possible to use a revolving roller which is covered with a textile material and which wipes off the surface of the jacket.
  • a suction device 23 is provided with the Help of the brush 23 sucks dust detached from the surface of the shell 3.
  • the surface cleaning device 19 also has an ionization electrode 20, with the aid of which the fibrous web 8 can be electrically discharged in order to reduce holding forces between the dust and the fibrous web 8.
  • the ionizer 20 is optional, i. it is only used when needed.
  • the surface cleaning device 19 for the fibrous web 8 also has a mechanical removal device 24, which is shown enlarged in FIG.
  • the removal device 24 has an air nozzle 25, which directs a sharp air jet 26 of compressed air against the surface of the fibrous web 8 and thereby dust, which rests against the surface of the fibrous web 8, detaches, in particular peels off.
  • a suction device 27 is provided, with the help of the detached dust can be sucked.
  • the two removal devices 21, 24 are therefore designed as surface cleaning arrangements which extend over the entire width of the fibrous web 8. The same applies to the suction device 12th

Landscapes

  • Cleaning In General (AREA)
  • Paper (AREA)
  • Prostheses (AREA)
  • Orthopedics, Nursing, And Contraception (AREA)
  • Absorbent Articles And Supports Therefor (AREA)

Claims (12)

  1. Calandre à pinçage allongé (1) comprenant un cylindre de sabot (2) présentant une enveloppe périphérique (3) et un sabot de pressage (4) et un élément de contre-pression (5), qui forment ensemble un pinçage allongé (7) à travers lequel s'étend un chemin de passage de nappe d'une nappe fibreuse (8), caractérisée en ce qu'à la sortie (10) du pinçage allongé (7) est disposé un dispositif d'enlèvement de poussière (11) dans le coin s'ouvrant entre la nappe fibreuse (8) et l'enveloppe (3).
  2. Calandre selon la revendication 1, caractérisée en ce que le dispositif d'enlèvement de poussière (11) est disposé entre la nappe fibreuse (8) et l'enveloppe (3).
  3. Calandre selon la revendication 1 ou 2, caractérisée en ce que le dispositif d'enlèvement de poussière (11) présente un dispositif d'aspiration (12).
  4. Calandre selon la revendication 3, caractérisée en ce que le dispositif d'aspiration (12) présente un élément de buse d'aspiration (13) orienté dans le coin entre la nappe fibreuse (8) et l'enveloppe (3).
  5. Calandre selon la revendication 4, caractérisée en ce que l'élément de buse d'aspiration (13) présente une première paroi (14) tournée vers la nappe fibreuse (8) et une deuxième paroi (15) tournée vers l'enveloppe (3), plusieurs ouvertures d'aspiration (16, 17) étant prévues dans au moins une paroi (14, 15).
  6. Calandre selon l'une quelconque des revendications 1 à 5, caractérisée en ce que l'on dispose sur la nappe fibreuse (8) et/ou sur l'enveloppe (3) un agencement de nettoyage de surface (18, 19).
  7. Calandre selon la revendication 6, caractérisée en ce que l'agencement de nettoyage de surface (18, 19) présente un dispositif mécanique de décollement de la poussière (21, 24).
  8. Calandre selon la revendication 7, caractérisée en ce que le dispositif de décollement de la poussière (24) présente un jet d'air sous pression (26).
  9. Calandre selon la revendication 7 ou 8, caractérisée en ce que le dispositif de décollement de la poussière (21) présente une brosse (22) déplaçable par rapport à la surface à nettoyer.
  10. Calandre selon l'une quelconque des revendications 7 à 9, caractérisée en ce que le dispositif de décollement de la poussière (21, 24) présente un dispositif d'aspiration (23, 27).
  11. Calandre selon l'une quelconque des revendications 7 à 10, caractérisée en ce que l'agencement de nettoyage de surface (18, 19) présente un dispositif d'ionisation (20).
  12. Calandre selon la revendication 11, caractérisée en ce que le dispositif d'ionisation (20) est disposé avant le dispositif de décollement de la poussière (21, 24) dans le sens d'avance de la nappe (9).
EP03027128A 2003-01-22 2003-11-26 Calandre à pinçage allongé Expired - Fee Related EP1445377B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE20300919U 2003-01-22
DE20300919U DE20300919U1 (de) 2003-01-22 2003-01-22 Breitnip-Kalander

Publications (2)

Publication Number Publication Date
EP1445377A1 EP1445377A1 (fr) 2004-08-11
EP1445377B1 true EP1445377B1 (fr) 2007-11-14

Family

ID=7979290

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03027128A Expired - Fee Related EP1445377B1 (fr) 2003-01-22 2003-11-26 Calandre à pinçage allongé

Country Status (3)

Country Link
EP (1) EP1445377B1 (fr)
AT (1) ATE378467T1 (fr)
DE (2) DE20300919U1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE20300919U1 (de) * 2003-01-22 2003-04-03 Voith Paper Patent Gmbh Breitnip-Kalander
KR20070038771A (ko) 2005-10-06 2007-04-11 엘지전자 주식회사 플라즈마 디스플레이 장치
DE102007022810A1 (de) * 2007-05-15 2008-11-20 Voith Patent Gmbh Reinigungsverfahren
FR2946501B1 (fr) * 2009-06-11 2011-08-12 Boulangerie Patisserie Felix Fabrice Dispositif de nettoyage d'une toile a couche
CN108951264A (zh) * 2018-07-12 2018-12-07 太仓怡泰霖智能科技有限公司 一种造纸软压光机

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE313731B (fr) * 1965-03-10 1969-08-18 Kuesters E Maschf
FI98389C (fi) * 1996-02-22 1997-06-10 Valmet Corp Menetelmä ja laite paperikoneella tai vastaavalla tai sen jälkikäsittelylaitteella rainasta irtoavan pölyn keräämiseksi ja poistamiseksi
US6148831A (en) * 1996-10-25 2000-11-21 Valmet Corporation Method for cleaning a web
SE9804346D0 (sv) * 1998-12-16 1998-12-16 Valmet Corp Method and apparatus for calendering paper
DE20300919U1 (de) * 2003-01-22 2003-04-03 Voith Paper Patent Gmbh Breitnip-Kalander

Also Published As

Publication number Publication date
EP1445377A1 (fr) 2004-08-11
ATE378467T1 (de) 2007-11-15
DE50308594D1 (de) 2007-12-27
DE20300919U1 (de) 2003-04-03

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