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WO2007085688A1 - Procede de traitement et d'amenee jusqu'a un dispositif de couchage d'un lait de couchage utilise pour coucher une bande fibreuse - Google Patents

Procede de traitement et d'amenee jusqu'a un dispositif de couchage d'un lait de couchage utilise pour coucher une bande fibreuse Download PDF

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Publication number
WO2007085688A1
WO2007085688A1 PCT/FI2007/050001 FI2007050001W WO2007085688A1 WO 2007085688 A1 WO2007085688 A1 WO 2007085688A1 FI 2007050001 W FI2007050001 W FI 2007050001W WO 2007085688 A1 WO2007085688 A1 WO 2007085688A1
Authority
WO
WIPO (PCT)
Prior art keywords
coating
coating colour
colour
degassing
degassing stage
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.)
Ceased
Application number
PCT/FI2007/050001
Other languages
English (en)
Inventor
Eero Kesti
Esa Forsten
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.)
Valmet Technologies Oy
Original Assignee
Metso Paper Oy
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 Metso Paper Oy filed Critical Metso Paper Oy
Priority to DE602007013350T priority Critical patent/DE602007013350D1/de
Priority to AT07700266T priority patent/ATE502698T1/de
Priority to EP07700266A priority patent/EP1976645B1/fr
Priority to JP2008540645A priority patent/JP4897823B2/ja
Priority to CN2007800011517A priority patent/CN101356015B/zh
Publication of WO2007085688A1 publication Critical patent/WO2007085688A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • 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
    • D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
    • D21H23/22—Addition to the formed paper
    • 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
    • D21H23/78—Controlling or regulating not limited to any particular process or apparatus
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
    • B05C11/10—Storage, supply or control of liquid or other fluent material; Recovery of excess liquid or other fluent material

Definitions

  • the present invention relates to a method for processing and supplying a coating colour used for coating a fibrous web to a coating device.
  • the mixing of gases, such as air, with the liquids and compositions used in a process typically causes several problems.
  • gas and gas bubbles in the coating colour result in roughness on the surface of the paper in coating, and even areas where there is no coating at all.
  • This problem is greater with some coating colours than others, but the problem is emphasised particularly with those coating colours that accumulate more gas than others.
  • coating colours containing talc typically contain large amounts of gas due to the properties of talc.
  • the significance of the problem is further affected by the coating method used. For example, in curtain coating, the gas content of the coating may be at most 0-0,25% by volume. Otherwise the gas bound by the coating may result in uncoated areas in the material to be coated, such as paper or board.
  • vacuum deaerators For removing the gas mixed with or dissolved in coating colour have been developed, for example, various types of vacuum deaerators, a known embodiment of which comprises a rotating drum arranged inside a vacuum container, into which drum the coating colour is delivered, whereupon the coating colour rises up the inner wall of the drum by the effect of centrifugal force and is discharged from the drum as a thin film colliding with the wall of the vacuum container.
  • the problem with prior art vacuum deaerators is their insufficient deaeration capacity, especially with highly viscous substances. This is due to the fact that the small air bubbles contained in highly viscous coating colours are unable, even under an extremely high vacuum, that is, low absolute pressure, to grow large enough to be broken or distinguished due to their specific rising rate.
  • the oscillating frequency is preferably within the range from about 16 to about 60 kHz, which affects the gas bubbles in the coating colour by making them bigger and thus easier to remove, for example, by means of a vacuum-operated degassing apparatus, or which break when they grow large enough. Due to the oscillation treatment, the efficiency of degassing increases considerably compared with using a known degassing apparatus alone.
  • the oscillation treatment may also take place at frequencies markedly lower than the ultrasound frequency.
  • Coating colour subjected to oscillation treatment may be at underpressure, overpressure or normal atmospheric pressure.
  • Another solution to this problem is a method disclosed in a previous application FI 20055704 by the applicant of the present application, which utilises a degassing apparatus in which are formed two separate compartments, so that degassing is carried out in two different stages by using a single apparatus.
  • the apparatus comprises a first container part, to which are connected means for providing a vacuum therein, means for feeding coating colour inside the first container part, means for degassing the coating colour in the first container part and means for discharging the coating colour from the first container part, and a second container part to which are connected means for providing a vacuum therein, means for feeding coating colour inside the second container part, means for degassing the coating colour in the second container part and means for discharging the coating colour from the second container part, wherein the coating colour is arranged to be first fed into the first container part, where the first degassing stage takes place, and then from the first container part into the second container part, where the second degassing stage takes place.
  • An absolute pressure of approximately 1 kPa - 15 kPa is preferably provided in the vacuum container parts. If a lower absolute pressure is provided in the chamber, this will mean, among other things, that the evaporating point of the solvent contained in the coating colour will fall and there is a risk of the quality of the coating colour deteriorating as a result of degassing. On the other hand, if a higher absolute pressure is provided in the chamber, this will not necessarily suffice to increase the size of gas bubbles in the coating colour by means of a vacuum. Providing an absolute pressure of about 3 kPa - 15 kPa in the vacuum container is highly preferable.
  • Figure 1 shows diagrammatically a prior art arrangement of this type, where the coating colour is delivered from the production line into the supply tank 1, after which it is delivered, for example, by means of feeder pump 6A to the degassing stage 2, which is preferably vacuum-operated 3. From the degassing stage 2, the treated coating colour is taken, for example, by means of feeder pump 6B, to the coating apparatus 5, by means of which it is applied on the surface of the fibrous web to be coated.
  • the amount of coating colour supplied to the degassing stage 2, 3 depends on the amount of coating colour required by the coating apparatus 5 at a given time.
  • the method according to the invention is characterised in that in the method, the coating colour from coating colour production is delivered into a storage tank, from where it is taken to the degassing stage, and from there further to the coating colour supply tank.
  • coating colour is supplied to the degassing stage preferably at a constant feed rate, the feed rate being, for example, 0 to about 50% more than the amount required for coating, whereby the excess is returned to the storage tank preceding the degassing stage.
  • the feed rate is preferably 5 to 15% more than the amount required for coating.
  • degassed coating colour is supplied, again at a constant feed rate, to a supply tank arranged in the coating device, whereupon in the supply tank of the coating device is only supplied the amount required each time by the coating device and the excess is returned to the storage tank.
  • the coating device has not had a supply tank of its own, which means that the amount of coating colour fed to the degassing stage has been dependent on the amount of coating colour required by the coating device each time.
  • the solution according to the invention where the coating device is provided with its own supply tank and the supplying of coating colour to the degassing stage and the coating colour supply tank takes place at constant quantities, provides stable conditions at the degassing stage and thus the production of coating colour of uniform quality as regards degassing.
  • the coating colour flow discharging from the degassing stage at a constant feed rate is typically smaller than the coating colour flow entering the degassing stage due to the discharging of gases from the coating colour. Also on the coating device, any excess coating colour from the coating stage is preferably returned to the storage tank preceding the degassing stage instead of to the machine cycle.
  • the apparatus relating to the invention is in turn characterised in that the device comprises means for delivering the coating colour from coating colour production to the storage tank, means for supplying coating colour to the degassing stage and means for supplying the coating colour further from the degassing stage to supply tank arranged in conjunction with the coating device.
  • Figure 1 shows diagrammatically a prior art arrangement for performing the degassing of coating colour and its supply to the coating device
  • Figure 2 shows diagrammatically an arrangement according to the invention for performing the degassing of coating colour and its supply to the coating device.
  • Figure 2 shows only diagrammatically an arrangement according to the invention, where the coating colour from the coating colour production process is first delivered to a storage tank 1, from where it is led by means of pump 6A to the degassing stage 2, which is preceded by a pre-treatment stage 7 in the embodiment disclosed.
  • the pre-treatment stage may include, for example, heating or cooling or filtering of the coating colour, pre- degassing treatment, ultrasound treatment or different combinations of these.
  • the degassing treatment 2 is preferably based on the use of a vacuum and may include one or more stages, such as, for example, the method disclosed in the applicant's earlier application FI 20055704, which uses a vacuum-operated degassing apparatus in which are formed two separate compartments, so that degassing is carried out in two different stages by using a single apparatus.
  • the coating colour is delivered by means of pump 6B to the supply tank 4 of the coating device 5, from where it is supplied by pump 6C to the coating device to be spread on the fibrous web.
  • filter means 9 which may be of any type known as such.
  • the arrangement further uses on-line measuring equipment 8, for example, for measuring the gas content of the coating colour discharging from the degassing stage, thus preventing coating colour having a gas content deviating from the allowed limits from entering the coating colour supply tank 4 and returning it to the storage tank, for example, in connection with the start-up of the device, which means that the coating colour may be recirculated several times through the degassing stage 2 if necessary, before feeding it into the supply tank 4.
  • the on-line measuring equipment 8 may include, for example, means for measuring the density of the coating colour coming from the degassing stage, in which case the measured density data can be used, for example, for indirectly determining the remaining gas content in the coating colour. Density measurement may be carried out, for example, as differential pressure measurement.
  • the on-line measuring equipment may also include, for example, a direct measuring device for gas content based on the use of sound or ultrasound, which may be used instead of indirect gas content determination based on density measurement.
  • the means for directing the coating colour back to the storage tank instead of the supply tank 4 may be any appropriate valve means (not shown), which direct excess coating colour fed from the degassing stage 2 back to the storage tank 1 also in normal operation.
  • coating colour is supplied from the storage tank 1 at a constant rate to the degassing stage 2 by means of pump 6A.
  • From the degassing stage is likewise supplied degassed coating colour at a constant rate by means of a pump 6B to the coating colour supply tank 4.
  • the supply tank 4 comprises, for example, liquid-level measuring means providing data on the basis of which the amount of coating colour required each time is led into the supply tank, excess coating colour being directed back to the storage tank 1.
  • the supply rate of coating colour from the degassing stage is preferably within the range from 0 to about 50% more than is required for coating.
  • the solution according to the invention may also be realised as an integrated degassing apparatus for two or more coating heads, in which there may be a separate pump 6B for each coating head for supplying coating colour from the degassing stage 2 to the coating heads or the pump 6B may be shared by all coating heads, feeding coating colour at a constant rate, whereby the amount of coating colour required each time is directed to the supply tank of each coating head, respectively, and the remainder is returned to the shared storage tank 1.

Landscapes

  • Coating Apparatus (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Degasification And Air Bubble Elimination (AREA)
  • Surface Treatment Of Glass Fibres Or Filaments (AREA)
  • Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
  • Treatment Of Fiber Materials (AREA)

Abstract

Procédé de traitement et d'amenée jusqu'a un dispositif (5) de couchage d'un lait de couchage utilisé pour coucher une bande fibreuse. Dans ledit procédé, le lait de couchage provenant de la production de lait de couchage est amené jusqu'à un réservoir (1) de stockage, à partir duquel il est envoyé à une étape (2) de dégazage, et de là encore à un réservoir (4) d'alimentation disposé en conjonction avec le dispositif (5) de couchage.
PCT/FI2007/050001 2006-01-26 2007-01-03 Procede de traitement et d'amenee jusqu'a un dispositif de couchage d'un lait de couchage utilise pour coucher une bande fibreuse Ceased WO2007085688A1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
DE602007013350T DE602007013350D1 (de) 2006-01-26 2007-01-03 Verfahren zur verarbeitung und zufuhr einer streichfarbe zur beschichtung einer faserbahn für eine beschichtungsvorrichtung
AT07700266T ATE502698T1 (de) 2006-01-26 2007-01-03 Verfahren zur verarbeitung und zufuhr einer streichfarbe zur beschichtung einer faserbahn für eine beschichtungsvorrichtung
EP07700266A EP1976645B1 (fr) 2006-01-26 2007-01-03 Procede de traitement et d'amenee jusqu'a un dispositif de couchage d'un lait de couchage utilise pour coucher une bande fibreuse
JP2008540645A JP4897823B2 (ja) 2006-01-26 2007-01-03 繊維ウェブを塗装するために使用するカラー塗料を処理し塗装装置に供給する方法
CN2007800011517A CN101356015B (zh) 2006-01-26 2007-01-03 处理涂层颜料并将其供给至涂敷装置的方法和设备

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI20065055A FI121122B (fi) 2006-01-26 2006-01-26 Menetelmä ja laitteisto kuiturainan päällystykseen käytettävän päällystysaineen käsittelemiseksi ja syöttämiseksi päällystyslaitteelle
FI20065055 2006-01-26

Publications (1)

Publication Number Publication Date
WO2007085688A1 true WO2007085688A1 (fr) 2007-08-02

Family

ID=35883952

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI2007/050001 Ceased WO2007085688A1 (fr) 2006-01-26 2007-01-03 Procede de traitement et d'amenee jusqu'a un dispositif de couchage d'un lait de couchage utilise pour coucher une bande fibreuse

Country Status (7)

Country Link
EP (1) EP1976645B1 (fr)
JP (1) JP4897823B2 (fr)
CN (1) CN101356015B (fr)
AT (1) ATE502698T1 (fr)
DE (1) DE602007013350D1 (fr)
FI (1) FI121122B (fr)
WO (1) WO2007085688A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007000722A1 (de) 2007-09-12 2009-03-19 Voith Patent Gmbh Verfahren und Vorrichtung zum Entgasen von flüssigen bis pastösen Medien, insbesondere Streichfarben
WO2009136851A1 (fr) * 2008-05-06 2009-11-12 Mattssonföretagen I Uddevalla Aktiebolag Procédé et analyseur de couleur de revêtement pour analyser en ligne la couleur d'un revêtement
AT13518U1 (de) * 2011-11-11 2014-02-15 Metso Paper Inc Vorrichtung zur Entlüftung eines auf eine Faserbahn aufzutragenden Beschichtungsmediums
WO2017096553A1 (fr) * 2015-12-09 2017-06-15 Acm Research (Shanghai) Inc. Procédé et appareil de nettoyage de substrats à l'aide de substances chimiques à haute température, et dispositif ultrasonore

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3980043A (en) * 1975-02-25 1976-09-14 Midland-Ross Corporation Pressure-type liquid coating applicator
GB2329257A (en) * 1997-09-11 1999-03-17 Muetek Analytic Gmbh A method of operating a coating apparatus and a measurement apparatus therefor
GB2333476A (en) 1998-01-27 1999-07-28 Eastman Kodak Co Coating method and apparatus
WO2004035928A1 (fr) * 2002-10-17 2004-04-29 Metso Paper, Inc. Procede et agencement pour la fabrication d'un revetement
DE10260593A1 (de) 2002-12-23 2004-07-01 Voith Paper Patent Gmbh Verfahren und Vorrichtung zum Beschichten einer Materialbahn
US20040226674A1 (en) * 2001-02-16 2004-11-18 Voith Paper Patent Gmbh Coating and method for producing coated paper or cardboard

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0552822A (ja) * 1990-12-12 1993-03-02 Kansai Paint Co Ltd 電着塗料の組成分析方法及び装置並びに組成管理方法及び装置
JPH06130547A (ja) * 1992-10-21 1994-05-13 Konica Corp 写真用塗布液の脱泡方法
JPH08215626A (ja) * 1995-02-15 1996-08-27 Mitsubishi Chem Corp 塗工方法及び塗工装置
JP3495935B2 (ja) * 1999-01-11 2004-02-09 日本特殊陶業株式会社 ガス濃度センサの使用方法及びガス濃度センサの制御装置
JP2001121062A (ja) * 1999-10-29 2001-05-08 Dainippon Printing Co Ltd 塗工方法及び塗工装置
JP3890229B2 (ja) * 2001-12-27 2007-03-07 株式会社コガネイ 薬液供給装置および薬液供給装置の脱気方法
FI114558B (fi) * 2003-03-06 2004-11-15 Metso Paper Inc Menetelmä käsittelyaineen syöttämiseksi applikointilaitteelle
FI121149B (fi) * 2005-12-28 2010-07-30 Metso Paper Inc Menetelmä ja laite kaasun poistamiseksi päällystysaineesta
FI20055713L (fi) * 2005-12-30 2007-07-01 Metso Paper Inc Menetelmä ja laittesto kaasun poistamiseksi päällystysaineesta

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3980043A (en) * 1975-02-25 1976-09-14 Midland-Ross Corporation Pressure-type liquid coating applicator
GB2329257A (en) * 1997-09-11 1999-03-17 Muetek Analytic Gmbh A method of operating a coating apparatus and a measurement apparatus therefor
GB2333476A (en) 1998-01-27 1999-07-28 Eastman Kodak Co Coating method and apparatus
US20040226674A1 (en) * 2001-02-16 2004-11-18 Voith Paper Patent Gmbh Coating and method for producing coated paper or cardboard
WO2004035928A1 (fr) * 2002-10-17 2004-04-29 Metso Paper, Inc. Procede et agencement pour la fabrication d'un revetement
DE10260593A1 (de) 2002-12-23 2004-07-01 Voith Paper Patent Gmbh Verfahren und Vorrichtung zum Beschichten einer Materialbahn

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007000722A1 (de) 2007-09-12 2009-03-19 Voith Patent Gmbh Verfahren und Vorrichtung zum Entgasen von flüssigen bis pastösen Medien, insbesondere Streichfarben
WO2009136851A1 (fr) * 2008-05-06 2009-11-12 Mattssonföretagen I Uddevalla Aktiebolag Procédé et analyseur de couleur de revêtement pour analyser en ligne la couleur d'un revêtement
AT13518U1 (de) * 2011-11-11 2014-02-15 Metso Paper Inc Vorrichtung zur Entlüftung eines auf eine Faserbahn aufzutragenden Beschichtungsmediums
WO2017096553A1 (fr) * 2015-12-09 2017-06-15 Acm Research (Shanghai) Inc. Procédé et appareil de nettoyage de substrats à l'aide de substances chimiques à haute température, et dispositif ultrasonore
CN108472558A (zh) * 2015-12-09 2018-08-31 盛美半导体设备（上海）有限公司 使用高温化学品和超声波装置清洗衬底的方法和装置
US11000782B2 (en) 2015-12-09 2021-05-11 Acm Research (Shanghai) Inc. Method and apparatus for cleaning substrates using high temperature chemicals and ultrasonic device

Also Published As

Publication number Publication date
ATE502698T1 (de) 2011-04-15
CN101356015B (zh) 2011-07-27
CN101356015A (zh) 2009-01-28
FI121122B (fi) 2010-07-15
EP1976645B1 (fr) 2011-03-23
JP4897823B2 (ja) 2012-03-14
FI20065055L (fi) 2007-07-27
EP1976645A1 (fr) 2008-10-08
FI20065055A0 (fi) 2006-01-26
DE602007013350D1 (de) 2011-05-05
JP2009516582A (ja) 2009-04-23

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