EP3601666A1 - Traitement de bande - Google Patents

Traitement de bande

Info

Publication number
EP3601666A1
EP3601666A1 EP18702468.2A EP18702468A EP3601666A1 EP 3601666 A1 EP3601666 A1 EP 3601666A1 EP 18702468 A EP18702468 A EP 18702468A EP 3601666 A1 EP3601666 A1 EP 3601666A1
Authority
EP
European Patent Office
Prior art keywords
fibrous web
smoothing
web
smoothing device
cooling unit
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.)
Granted
Application number
EP18702468.2A
Other languages
German (de)
English (en)
Other versions
EP3601666B1 (fr
Inventor
Guenter Bonk
Guenther Kriechbaum
Thomas Mack
Bettina Grashof
Joachim Grabscheid
Xiaowu Zhang
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 EP3601666A1 publication Critical patent/EP3601666A1/fr
Application granted granted Critical
Publication of EP3601666B1 publication Critical patent/EP3601666B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G9/00—Other accessories for paper-making machines
    • D21G9/009—Apparatus for glaze-coating paper webs
    • 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
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H23/00—Processes or apparatus for adding material to the pulp or to the paper

Definitions

  • the invention relates to a method for treating a fibrous web, in particular a paper or board web in the end section of a machine for producing the same, which in the web running direction successively a drying section for drying, a first smoothing device for pre-smoothing, a coating device for application of coating color, another smoothing device and a retractor for winding the finished fibrous web, wherein the fibrous web between the dryer section and retractor is passed through at least one cooling unit with evaporative cooling.
  • a paper or board machine with headbox, shaper, press and dryer section.
  • a calender and / or a coating device are usually arranged at the outlet of the dryer section or behind a dryer group within the dryer section.
  • the web is smoothed and optionally also compacted.
  • a pigmented coating color is applied to one or both surfaces of the web in a coater.
  • steam or water is applied to the web before the calender.
  • the object of the invention is to ensure a volume-saving smoothing and possibly also an improved surface quality during reeling.
  • the object has been achieved in that the fibrous web is cooled before each of the first and between the first and the further smoother by means of at least one cooling unit.
  • the fibrous web between the further smoothing device and the retractor should also be cooled by means of at least one cooling unit.
  • the fibrous web is cooled and moistened by means of a cooling unit in such a way that the moisture content changes absolutely by less than 1% and preferably remains approximately constant.
  • the cooling of the fibrous web is the basis for a volume-gentle smoothing and the least possible impairment of the line in the reeling.
  • Efficient cooling proves to be the evaporative cooling. In addition, however, also warming of the fibrous web when smoothing and brushing lead to the loss of moisture.
  • the temperature of the fibrous web should fluctuate as little as possible in this section of the machine. Therefore, it is preferable to cool at a plurality of web-spaced locations.
  • the fibrous web should be cooled such that the temperature of the fibrous web before the retractor is at most 50 ° C.
  • the fibrous web should first be cooled before the first smoothing device.
  • the cooling is preferably carried out with air. Because of the associated evaporative cooling, the fibrous web should be moistened in the cooling unit by means of sprayed water. After the first cooling by means of the first cooling unit and before the first smoothing device, the fibrous web should preferably be heated and moistened on both sides by means of steam.
  • the heating is limited to the surface area of the fibrous web, so that due to the cool core of the fibrous web still a volume-smoothing can be guaranteed.
  • cooling can be done by means of evaporative cooling. It is understood that cooling and / or moistening of the fibrous web can be adapted to the needs and the nature of the web, i. For example, that the fibrous web can be acted upon one or both sides and also the moistening takes place at a plurality of web-spaced apart locations.
  • At least one side of the fibrous web should be heated in each smoothing device.
  • further smoothing device with relatively low pressing pressures which is why it is advantageous if the entire residence time of the fibrous web in the one or more nips of the further smoothing device is substantially longer than in the one or more nips of the first smoothing device ,
  • the smoothing of the fibrous web should take place in the further smoothing device by means of smoothing rolls, of which at least one has an elastic sheath cover.
  • the first smoothing device has only smoothing rollers with a hard lateral surface.
  • the formation of sheets in the former from at least 3, a maximum of 5 layers, wherein at least one layer is formed by a wire.
  • the fibrous web 1 passes the first press nip together with both sides each an endless circulating, water-absorbing dewatering tape and the fibrous web 1 comes in the last press nip directly in contact with a smooth press roller ,
  • the first drying group is formed here only from 2 to 4 drying cylinders and has only one, preferably over the fibrous web 1 endlessly circulating drying wire, which leads the fibrous web 1 to the drying cylinder.
  • a medium preferably starch
  • a medium can be applied to the fibrous web 1 on one or both sides via a coating unit.
  • the fibrous web 1 is acted upon on both sides by a first cooling unit 6 with ambient air.
  • the moistening device 8 in the form of a steam blow box acts on both sides of the fibrous web 1 with steam, which leads to the heating of the vapor-deposited web surface but also to the formation of condensate on this.
  • the re-wetting supports the subsequent smoothing, in particular when the web side comes into contact with the condensate layer with a heated smoothing roll of the first flattening device 3.
  • the heating by the steam does not significantly affect the cool core of the fibrous web 1, so that the smoothing takes place in the first smoothing device 3 volume-saving.
  • the first smoothing device 3 is formed here by two pressed against each other smoothing rollers with a hard outer surface, which allows intensive smoothing and thickness profile ization. In addition, at least one of the smoothing rollers is heated from inside and / or outside.
  • the fibrous web 1 passes into a coating device 9 with two to five separate coating units in which, in a manner known per se, a pigment-containing coating is applied to one or both sides of the fibrous web 1.
  • the web temperature rises again to values of 60 to 90 ° C.
  • the fibrous web 1 is cooled in at least one further cooling unit 7,10 back to a temperature of less than 50 ° C in front of the retractor 5.
  • the fibrous web 1 can be smoothed volume-saving because of the relatively low temperature. Therefore, at least one of the further cooling units 7 should be present between the coating device 9 and the further smoothing device 4.
  • the further smoothing device 4 is formed by two pressed against each other smoothing rollers, one of which is heated.
  • the smoothing gap is designed to be longer, so that the residence time of the fibrous web 1 in this nip is substantially longer than in the nip of the first smoothing device 3.
  • the smoothing in the smoothing nip of the further smoothing device 4 can take place with a lower pressing pressure, which protects the volume.
  • the fibrous web 1 passes for winding to the retractor 5, wherein between the smoothing device 4 and the retractor 5 still another cooling unit 10 may be arranged.
  • the fibrous web 1 between the dryer section 2 and the retractor 5 is moistened and cooled via the respective cooling units 6, 7, 10 such that the moisture content across each cooling unit 6, 7, 10 changes absolutely by less than 1%, and preferably remains approximately the same.
  • the moisture content of the fibrous web 1 in this end section of the machine is between 6 and 11%.
  • the fibrous web 1 is cooled so that the temperature of the fibrous web 1 before the retractor 5 is at most 50 ° C.

Landscapes

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

Abstract

L'invention concerne un procédé de traitement d'une bande de matière fibreuse (1), en particulier d'une bande de papier ou de carton dans la partie terminale d'une machine pour la fabrication de la bande. Ladite partie terminale comprend une sécherie (2) pour le séchage, un premier dispositif de lissage (3) pour le pré-lissage, un dispositif de couchage (9) pour l'application d'une sauce de couchage, un autre dispositif de lissage (4) ainsi qu'un dispositif d'enroulement (5) pour enrouler la bande de matière fibreuse finie (1), la bande de matière fibreuse (1) étant guidée entre la sécherie (2) et le dispositif d'enroulement (5) par au moins une unité de refroidissement (6, 7, 10) à refroidissement par évaporation. L'invention vise à permettre un lissage respectant le volume et un enroulement optimal. A cet effet, la bande de matière fibreuse (1) est refroidie avant le premier dispositif de lissage (3) et entre le premier dispositif de lissage (3) et l'autre dispositif de lissage (4) au moyen respectivement d'au moins une unité de refroidissement (6, 7, 10).
EP18702468.2A 2017-03-21 2018-01-29 Traitement de bande Active EP3601666B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102017106050 2017-03-21
PCT/EP2018/052064 WO2018171959A1 (fr) 2017-03-21 2018-01-29 Traitement de bande

Publications (2)

Publication Number Publication Date
EP3601666A1 true EP3601666A1 (fr) 2020-02-05
EP3601666B1 EP3601666B1 (fr) 2024-01-17

Family

ID=61132422

Family Applications (1)

Application Number Title Priority Date Filing Date
EP18702468.2A Active EP3601666B1 (fr) 2017-03-21 2018-01-29 Traitement de bande

Country Status (3)

Country Link
EP (1) EP3601666B1 (fr)
CN (1) CN110446811B (fr)
WO (1) WO2018171959A1 (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 (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI105935B (fi) * 1996-12-03 2000-10-31 Valmet Corp Menetelmä paperin kuivaamiseksi sekä paperikoneen kuivapää
FI971301A (fi) * 1997-03-27 1998-09-28 Valmet Corp Menetelmä paperin käyristymän hallitsemiseksi paperikoneen kuivatusosalla ja paperi- tai kartonkikone
DE10255907A1 (de) * 2002-11-29 2004-06-24 Voith Paper Patent Gmbh Maschine zur Herstellung und/oder Behandlung einer Faserstoffbahn
DE102006051537A1 (de) * 2006-10-27 2008-04-30 Voith Patent Gmbh Vorrichtung zum Bearbeiten einer Bahn aus Papier oder Karton
DE102010029617A1 (de) * 2010-06-02 2011-12-08 Voith Patent Gmbh Verfahren zur Herstellung einer gestrichenen, mehrlagigen Faserstoffbahn
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
EP2876206B2 (fr) * 2013-11-21 2023-03-01 Valmet Technologies, Inc. Procédé de produktion de bandes de fibres et ligne de fabrication de bandes de fibres

Also Published As

Publication number Publication date
CN110446811A (zh) 2019-11-12
CN110446811B (zh) 2021-06-04
EP3601666B1 (fr) 2024-01-17
WO2018171959A1 (fr) 2018-09-27

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