EP4234809A2 - Traitement de bande continue - Google Patents

Traitement de bande continue Download PDF

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Publication number
EP4234809A2
EP4234809A2 EP23173006.0A EP23173006A EP4234809A2 EP 4234809 A2 EP4234809 A2 EP 4234809A2 EP 23173006 A EP23173006 A EP 23173006A EP 4234809 A2 EP4234809 A2 EP 4234809A2
Authority
EP
European Patent Office
Prior art keywords
fibrous web
web
partial treatment
partial
smoothing
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.)
Withdrawn
Application number
EP23173006.0A
Other languages
German (de)
English (en)
Other versions
EP4234809A3 (fr
Inventor
Xiaowu Zhang
Thomas Mack
Henning Stegmans
Katharina KEHREN
Franziska FERRER
Arian KRIESCH
Guenter Bonk
Guenther Kriechbaum
Joachim Grabscheid
Bettina Grashof
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 EP4234809A2 publication Critical patent/EP4234809A2/fr
Publication of EP4234809A3 publication Critical patent/EP4234809A3/fr
Withdrawn legal-status Critical Current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
    • D21G1/0073—Accessories for calenders
    • D21G1/0093—Web conditioning devices
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G7/00—Damping devices

Definitions

  • the invention relates to a method for treating a paper, cardboard or other fibrous web before it is smoothed.
  • a paper or board machine with a headbox, former, press and drying section is usually used to produce paper or board webs.
  • a calender and/or a coating device are usually arranged at the exit of the drying section or behind a drying group within the drying section. In the calender, the web is smoothed and compressed at the same time. In contrast, in a coater, a coating color is applied to one or both surfaces of the web.
  • the object of the invention is to ensure an improved surface quality with the largest possible web volume.
  • the object was achieved in that the fibrous web is moistened within at least one partial treatment, then cooled with air and then moistened again.
  • the moisture content of the fibrous web can then be brought to an optimum level for subsequent treatment via the subsequent moistening.
  • the temperature of the cooling air should be at least 20°C below the web temperature and its relative humidity should be between 50 and 100%.
  • the high relative humidity of the cooling air prevents it from absorbing water from the fibrous web and transporting it away as exhaust air. In this way, the moisture content of the fibrous web can be kept at an optimal level for the preferably subsequent smoothing.
  • the relative humidity of the cooling air is between 70 and 100%, preferably between 80 and 100%.
  • the temperature of the cooling air should be at least 40°C below the web temperature.
  • cooling water is expediently mixed with it, in particular sprayed into the cooling air.
  • the temperature of the cooling water is below the temperature of the cooling air and/or the temperature of the cooling water is between 5 and 30°C, preferably between 5 and 20°C .
  • coated fibrous webs are relatively problematic, since the usual cooling with air leads to evaporative cooling and thus to a reduction in the moisture content of the fibrous web.
  • rewetting of the line, i.e. the coating is not possible or has a negative effect on the coating.
  • At least one side of the fibrous web is coated before cooling, at least the coated side of the fibrous web should be exposed to cooling air.
  • the fibrous web should be moistened in several consecutive partial treatments, then cooled with air and then moistened again.
  • the amount of water applied to the fibrous web during a partial treatment for moistening should be between 0.5 and 0.8, preferably between 0.6 and 0.7 g of water per kg of treated fibrous web weight per °C of cooling caused by the partial treatment.
  • the moisture content changes by no more than 1% in absolute terms over one or more partial treatments arranged one after the other.
  • the moisture content should even remain approximately constant.
  • the web moisture and/or the web temperature are particularly important for coating or smoothing the fibrous web. However, it can also be important if the web moisture and/or temperature are changed again after coating or calendering.
  • the fibrous web is coated and/or smoothed between two partial treatments.
  • the temperature of the fibrous web should be between 10 and 40° C. after at least one, preferably after all, partial treatments. This temperature range also applies in particular after the last partial treatment on at least one side of the fibrous web.
  • partial treatments is particularly advantageous if the dry content of the fibrous web before a partial treatment, at least before the first partial treatment, is below 95%.
  • the dry content of the fibrous web should be over 88% after a partial treatment, at least after the last partial treatment.
  • the fibrous web is smoothed on one side, it can be sufficient if the partial treatments are only carried out on one side of the fibrous web, preferably the side to be smoothed.
  • the partial treatments should be carried out on both sides of the fibrous web.
  • the partial treatments of both sides of the fibrous web are realized in the same web section.
  • the air impingement for cooling the fibrous web in at least one partial treatment can be controlled in zones transverse to the direction of travel of the web.
  • the fibrous web can be moistened within a partial treatment with steam and/or water.
  • the fibrous web is heated with steam or moist, warm air between a partial treatment and a subsequent smoothing. This leads to the formation of condensate on the loaded web side and, in addition to moistening, this web side also heats up.
  • At least one side of the fibrous web should come into contact with at least one heated smoothing surface during smoothing and this side of the fibrous web should be heated beforehand with steam or moist, warm air.
  • figure 1 a schematic cross section through a partial treatment unit 1
  • Figures 2 to 4 different system schemes with partial treatment units 1.
  • the fibrous web 2 is first to be moistened in the web travel direction 3 via a partial treatment unit 1, then to be subjected to cool air and then to be moistened again.
  • the first moistening of the fibrous web 2 is the basis for the subsequent evaporative cooling by means of air blowing.
  • the associated loss of moisture is then compensated for by the final humidification.
  • the amount of water advantageously applied to the fibrous web 2 during a partial treatment for moistening per °C of cooling effected by the partial treatment unit 1 is between 0.5 and 0.8, preferably between 0.6 and 0.7 g of water per kg fibrous web weight.
  • the amount of water to be applied is between 25 and 40 g, preferably between 30 and 35 g.
  • the partial treatment unit 1 according to FIG figure 1
  • One spray device each at the web entry end and web exit end 4
  • the liquid—usually water—which is applied to the fibrous web 2 by the spray device 4 can be temperature-controlled, with the temperature preferably being below 40.degree.
  • the spray devices 4 have two-material nozzles in a way that is not shown in detail, to which water (or another liquid) is fed as the humidifying medium and air (or another compressed gas) is fed in as the atomizing medium.
  • the amount sprayed should be in the range between 1 and 30 g/m 2 , preferably between 1 and 5 g/m 2 .
  • the spray devices 4 with three-material nozzles.
  • the moistening medium e.g. water
  • an atomizing medium e.g. air
  • a third medium for example steam, can also be added. This third medium can also be used for atomization at the same time.
  • the liquid is divided into the finest droplets so that there are no water stains that could adversely affect the appearance of the fibrous web 2 .
  • the compressed air nozzles can be supplied with compressed air from a common compressed air box.
  • partial treatment units 1 In order to achieve the intended web temperature and/or web moisture content, particularly in fast-running machines, it may be necessary to arrange several partial treatment units 1 one behind the other in the web travel direction 3 . Likewise, the partial treatment units 1 can only be present on one side of the fibrous web 2 or on both sides.
  • Example shown are the fibrous web 2 after leaving the drying section 8 of a paper machine for the production of the same on both Pages are each assigned two partial treatment units 1 located one behind the other in the web travel direction 3 .
  • the goal is to bring the moisture and the temperature of the fibrous web 2 to an optimal level for the subsequent smoothing in a subsequent smoothing device 6 . This enables improved surface quality to be achieved with the largest possible web volume.
  • a partial treatment unit 1 is assigned to both sides, which optimally conditions the fibrous web 2 for the subsequent reeling 7 .
  • FIG 3 an embodiment is shown in which only one partial treatment unit 1 is present in front of the smoothing device 6 .
  • a steam blower box 9 for moistening and heating.
  • both sides of the fibrous web 2 are again conditioned by a partial treatment unit 1 before the fibrous web 2 runs through a coating device 10 .
  • the cooling takes place upstream of the smoothing device 6 on both sides of the fibrous web 2 via a partial treatment unit 1 each, although between a partial treatment unit 1 , which is lower here, and the smoothing device 6 there is a steam blower box 9 .
  • the cooling of the fibrous web 2 ensures that as little volume as possible is lost when the fibrous web 2 is pressurized during smoothing.
  • the heating of the web surface by means of steam can be accepted, since a cool, central region of the fibrous web 2 is particularly important for volume protection during smoothing.
  • the quality of the smoothing of one side of the fibrous web 2 can be improved in that it comes into contact with a heated smoothing surface during the smoothing.
  • this smoothing surface is formed by a heated smoothing roller, which forms a smoothing gap with a counter-roller.
  • the layer of condensate on the heated side of the web thus improves the gloss and smoothness.
  • both sides of the fibrous web 2 are conditioned by a partial treatment unit 1 before the fibrous web 2 runs through a coating device 10 .
  • the smoothing device 6 can generally be formed by only one smoothing gap or a stack of rolls with several smoothing gaps.
  • the smoothing gaps can be of the same or different design.
  • the smoothing gaps can be hard or soft, short or long.
  • a line is applied to one or preferably both sides of the fibrous web 2 in a manner known per se.
  • the partial treatment units 1 are preferably arranged opposite one another, so that the stress on the fibrous web 1 is canceled out, in particular by the pressurized air.
  • the partial treatment units 1 on both sides of the fibrous web 2 can be operated in the same way. But this is not absolutely necessary.
  • the curl of the web can be taken into account and the amounts of liquid applied by the partial treatment units 1 can be adjusted in such a way that the tendency of the fibrous web 2 to curl is reduced.
  • the partial treatment units 1 are set here in such a way that the temperature of the fibrous web 2 is between 10 and 40° C. at least after the last partial treatment.
  • the partial treatment units 1 are preferably used where the dry content of the fibrous web is below 92%.
  • a dry content of the fibrous web 2 of over 92% is aimed at.
  • the moistening or the air impingement for cooling the fibrous web 2 can be carried out in at least one partial treatment unit 1 in zones transverse to the web running direction 3 be controllable.
  • At least individual nozzles of the spray device 4 or individual compressed air nozzles for applying compressed air can then be controlled separately.
  • the spray device 4 can also be designed in such a way that some of the nozzles are controlled via a common valve. A base load of the liquid is then applied to the fibrous web 2 with these nozzles. Another part of the nozzles each has its own valve in order to be able to fine-tune the uniformity and/or create a profile.

Landscapes

  • Paper (AREA)
  • Treatment Of Fiber Materials (AREA)
EP23173006.0A 2017-02-03 2018-01-30 Traitement de bande continue Withdrawn EP4234809A3 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
DE102017102120 2017-02-03
DE102017106037 2017-03-21
DE102017106063 2017-03-21
PCT/EP2018/052236 WO2018141727A1 (fr) 2017-02-03 2018-01-30 Traitement de bande continue
EP18703931.8A EP3577272A1 (fr) 2017-02-03 2018-01-30 Traitement de bande continue

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
EP18703931.8A Division EP3577272A1 (fr) 2017-02-03 2018-01-30 Traitement de bande continue

Publications (2)

Publication Number Publication Date
EP4234809A2 true EP4234809A2 (fr) 2023-08-30
EP4234809A3 EP4234809A3 (fr) 2023-11-08

Family

ID=61188771

Family Applications (2)

Application Number Title Priority Date Filing Date
EP23173006.0A Withdrawn EP4234809A3 (fr) 2017-02-03 2018-01-30 Traitement de bande continue
EP18703931.8A Withdrawn EP3577272A1 (fr) 2017-02-03 2018-01-30 Traitement de bande continue

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP18703931.8A Withdrawn EP3577272A1 (fr) 2017-02-03 2018-01-30 Traitement de bande continue

Country Status (3)

Country Link
EP (2) EP4234809A3 (fr)
CN (1) CN110291248B (fr)
WO (1) WO2018141727A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102021113813A1 (de) * 2021-05-28 2022-12-01 Voith Patent Gmbh Verfahren und Vorrichtung

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2855906A1 (de) * 1978-12-23 1980-07-10 Lechler Gmbh & Co Kg Spritzvorrichtung
EP0957202B1 (fr) * 1998-05-08 2004-03-31 V.I.B. Systems GmbH Procédé et dispositif pour la fabrication de papier SC-A online
DE19826899B4 (de) * 1998-05-08 2005-05-19 V.I.B. Systems Gmbh Verfahren und Vorrichtung zur Online-Kalandrierung von SC-A-Papier
US6264795B1 (en) * 2000-06-21 2001-07-24 Abb, Inc. Supercalendar steam shower
US7294235B2 (en) * 2002-07-30 2007-11-13 Abb Ltd. Supercalendering optimization using a steam shower
DE10255907A1 (de) * 2002-11-29 2004-06-24 Voith Paper Patent Gmbh Maschine zur Herstellung und/oder Behandlung einer Faserstoffbahn
DE10347953A1 (de) * 2003-10-15 2005-05-19 Voith Paper Patent Gmbh Bahnbefeuchtung
DE102004062618A1 (de) * 2004-12-24 2006-07-06 Voith Paper Patent Gmbh Glättanordnung
EP2682520B1 (fr) * 2012-07-03 2016-06-22 Valmet Technologies, Inc. Procédé de production d'une bande fibreuse et ligne de production d'une bande fibreuse
EP2765237B1 (fr) * 2013-02-06 2016-11-23 Valmet Technologies, Inc. Procédé de production d'une bande de fibres et ligne de fabrication d'une bande de fibres

Also Published As

Publication number Publication date
EP4234809A3 (fr) 2023-11-08
CN110291248B (zh) 2021-05-28
CN110291248A (zh) 2019-09-27
EP3577272A1 (fr) 2019-12-11
WO2018141727A1 (fr) 2018-08-09

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