WO2007020332A1 - Procédé et installation permettant d’améliorer la facilité d’utilisation d’une encolleuse à rideau alimentée par pinces et de limiter la perte du matériau de revêtement - Google Patents

Procédé et installation permettant d’améliorer la facilité d’utilisation d’une encolleuse à rideau alimentée par pinces et de limiter la perte du matériau de revêtement Download PDF

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Publication number
WO2007020332A1
WO2007020332A1 PCT/FI2006/050359 FI2006050359W WO2007020332A1 WO 2007020332 A1 WO2007020332 A1 WO 2007020332A1 FI 2006050359 W FI2006050359 W FI 2006050359W WO 2007020332 A1 WO2007020332 A1 WO 2007020332A1
Authority
WO
WIPO (PCT)
Prior art keywords
nozzle
coating
flushing liquid
flow plane
flushing
Prior art date
Application number
PCT/FI2006/050359
Other languages
English (en)
Inventor
Heikki Vatanen
Original Assignee
Metso Paper, Inc.
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, Inc. filed Critical Metso Paper, Inc.
Priority to DE112006002157T priority Critical patent/DE112006002157T5/de
Publication of WO2007020332A1 publication Critical patent/WO2007020332A1/fr

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
    • D21H23/46—Pouring or allowing the fluid to flow in a continuous stream on to the surface, the entire stream being carried away by the paper
    • D21H23/48—Curtain coaters
    • 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
    • D21H23/46—Pouring or allowing the fluid to flow in a continuous stream on to the surface, the entire stream being carried away by the paper
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B15/00—Details of spraying plant or spraying apparatus not otherwise provided for; Accessories
    • B05B15/50—Arrangements for cleaning; Arrangements for preventing deposits, drying-out or blockage; Arrangements for detecting improper discharge caused by the presence of foreign matter
    • B05B15/55—Arrangements for cleaning; Arrangements for preventing deposits, drying-out or blockage; Arrangements for detecting improper discharge caused by the presence of foreign matter using cleaning fluids
    • B05B15/555—Arrangements for cleaning; Arrangements for preventing deposits, drying-out or blockage; Arrangements for detecting improper discharge caused by the presence of foreign matter using cleaning fluids discharged by cleaning nozzles
    • 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
    • B05C5/00—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
    • B05C5/005—Curtain coaters
    • 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
    • B05C5/00—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
    • B05C5/007—Slide-hopper coaters, i.e. apparatus in which the liquid or other fluent material flows freely on an inclined surface before contacting the work
    • B05C5/008—Slide-hopper curtain coaters
    • 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
    • B05C9/00—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important
    • B05C9/06—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important for applying two different liquids or other fluent materials, or the same liquid or other fluent material twice, to the same side of the work
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
    • G03C1/00—Photosensitive materials
    • G03C1/74—Applying photosensitive compositions to the base; Drying processes therefor
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
    • G03C1/00—Photosensitive materials
    • G03C1/74—Applying photosensitive compositions to the base; Drying processes therefor
    • G03C2001/7433—Curtain coating

Definitions

  • the invention relates to a method for improving the usability of a slide-fed curtain coater, which is used for coating a fibrous web, and for reducing the loss of coating material, said curtain coater having a nozzle unit which comprises at least two adjacent nozzle parts and which nozzle unit includes a nozzle slot between said at least two adjacent nozzle parts, which extends in a longitudinal direction of the coating device and which has coating material supplied across its entire breadth and further discharged through an outlet opening of the nozzle slot onto a flow plane established by a top surface of the nozzle parts.
  • the invention relates also to an arrangement for performing this method.
  • An objective of the present invention is to provide an improvement in a slide-fed curtain coating device intended for the application of a paper/board web coating paste, especially in connection with web breaks.
  • curtain coaters of a coating material involve several problems, which all have an adverse effect on the usability and runnability of an entire fibrous web production line.
  • the nozzle unit of a slide-fed curtain coater has generally its feeding chambers washed and flushed during the occurrence of web breaks and the like malfunctions leading to a momentary stoppage of the production line in order to prevent the coating material from drying and the slot from becoming blocked.
  • Essential problems in such a procedure include the duration of a washing sequence and the coating paste going to waste as the coating process is restarted for as long as the removal of all water from the beam is successfully completed. Operations performed in cleaning engage workforce unnecessarily when it would be rather needed for mending defects caused by the actual break and for preparations regarding a restart of the rest of the fibrous web production line.
  • Another problem in a currently applied washing method is constituted by an increased risk of air bubbles developing inside the beam. These bubbles cause flaws in the coating curtain and end up in the coating with a degrading effect on its quality.
  • the effluent resulting from a washing process of the beam and containing coating agents also incurs unnecessary extra costs.
  • the present invention is aimed at providing an improved curtain coater, which first of all is quickly activable immediately after a break in the run and which also enables avoiding the other foregoing problems at the same time.
  • the invention provides a solution in which the nozzle unit washing sequence has been upgraded in such a way that the beam's feeding chamber need not be emptied and washed in web breaks and other short-term interruptions. Also, with regard to all of its running parameters, the nozzle unit is maintainable all the time at values consistent with its normal operating mode, such that the quality of curtain coating is flawless immediately after a restart and thereby the amount of waste products is minimized.
  • a method of the invention is characterized by what is presented in the characterizing clause of the first claim.
  • An arrangement of the invention for implementing this method is in turn characterized by what is presented in the characterizing clause of the 9th claim.
  • Hg. 1 shows in a schematic cross-sectional view a nozzle unit for one slide- fed curtain coater, in which the nozzle unit has its top edge provided, among others, with a washing jet according to one exemplary embodiment of the invention.
  • nozzle unit 1 for a slide-fed curtain coater.
  • the nozzle unit comprises nozzle parts 3, 3a and 32 mounted on top of a support structure (not shown), which jointly constitute a nozzle unit including three nozzle slots 30, 30b.
  • This design also enables multiple curtain coating.
  • the nozzle unit has one of its ends provided with coating paste feeding pipes (not shown), which open into feeding chambers 12.
  • the substance to be fed travels along a feeding chamber towards the opposite end, which is optionally provided with a by-pass route.
  • the substance to be discharged passes at each point of the feeding chamber's length into a equalizing chamber 13 and thence further into the nozzle slot 30 across the entire width thereof.
  • a coating curtain 5 is made up from three individual layers of coating material.
  • the successive layers of coating material discharging from the nozzle slots' 30 outlet openings 31 and trickling along a nozzle unit's flow plane 4 established by the nozzle parts' top surfaces, are guided over a feeding lip established by an edge 41 of the applicator beam.
  • the supply of coating paste to the applicator beam is also discontinued, the result will be a hazard of the coating material drying or becoming deposited in nozzle slots, along a flow plane, as well as in flow paths and chambers.
  • the currently employed washing sequence has involved a process of cleaning and washing the feeding chambers clear of a coating material, the same being done on the flow plane itself. All this requires plenty of labor and thereby engages manpower and most importantly takes time during a break, which perhaps otherwise would prove to be very short indeed.
  • the duration of web breaks is typically within the range of 7 minutes to 1 hour, in on-line machines typically less than 10 minutes.
  • this break duration may easily double.
  • Another drawback in the above type of washing process is the resulting large quantity of wash water containing coating material, the proper treatment of which water incurs more costs.
  • one exemplary embodiment of the invention is provided with means for flushing the flow plane with a flushing liquid.
  • the nozzle unit has its upper edge 35 provided with a washing jet 36 covering the entire breadth of the beam, wherein flushing liquid is adapted to be delivered from a small gap 33 whenever the supply of a coating paste is stopped.
  • This flushing liquid cleans the beam's flow plane of coating material while preventing the coating material from drying in the nozzle slot's 30 top section 31.
  • the flushing liquid is preferably dispensed in such an abundant amount that said flushing liquid establishes a substantially unbroken layer as it trickles along the flow plane 4.
  • the amount of flushing liquid is basically reducible, yet making sure that there is no coating material drying in the nozzle slots' outlet openings 31.
  • the flushing liquid remaining in passages after the flushing is concluded is allowed to escape at least partially from the system of passages, thus making sure that no more flushing liquid is allowed onto the flow plane during the course of an actual working cycle.
  • the flushing is not brought to a total closure until just before a restart.
  • the flow plane can be easily dried simply in a manual fashion, for example by wiping with an appropriate piece of cloth.
  • the commencement of a coating process can be performed very quickly, the beam's feeding chambers being full of ready-to-apply coating paste.
  • the flushing liquid at an appropriate temperature in a flushing process, the beam temperature can be maintained consistent and in line with a normal operating temperature even during a break.
  • the sizing of nozzle slots remains constant and the coating can be given a flawless cross-profile right from the start of a run.
  • the operating temperature of a coating material and a nozzle unit is typically in the order of +20 0 C to +45°C. Regulating the temperature as well as the amount of flushing liquid makes it possible to control also the temperature of a beam and the consistent temperature distribution thereof during a break and to retain it within the above-mentioned range.
  • an essential benefit offered by a method of the invention is a possibility of maintaining a slide-fed curtain coating device in a simple and cost-cutting manner in a very quickly activable readiness, i.e. in a sort of standby status, in relation to restarts in the event of malfunctions as well as also restarts e.g. after shutdowns,
  • a method of the invention can be applied to set the curtain coating device in a ready- to-operate condition and to retain it in that condition while the rest of a fibrous web production line is being prepared for activation. As soon as the rest of the production line is started, the curtain coating device can be put to service immediately.
  • a useful flushing liquid may even be water alone, or water can be supplied at least at some point of a flushing process with additives or detergents or surface finishes suitable for reducing a surface tension and enhancing a washing process with regard to the qualities of each coating material.
  • these additives can be used to resist the formation of films on a flow plane. Such films impede the sliding of a coating curtain along the flow plane and thereby cause disturbances in the coating curtain.
  • a consequence of flushing with water alone is that the flow plane is liable to develop a film which hinders a uniform spreading of the coating material throughout the slide in connection with a restart.
  • the washing process can be accompanied by a mechanical cleaning as well, e.g. simply by wiping with a sponge or by means of an appropriate, especially automatically controlled appliance.
  • Another improvement in terms of flushing and washing can be provided by using particularly dissolving flushing liquids in the early part of a flushing cycle.
  • the flushing liquid is of course also suppliable onto a flow plane by other useful techniques, for example by mist blowing, delicate spraying and sprinkling or in other such fashion or by a combination of the above.
  • means for spraying water are indicated by reference numeral 66.
  • a supply pipe extending crosswise of the flow plane and represented by reference numeral 68, from which the flushing liquid can be delivered onto the flow plane across the full width thereof.
  • the above dispensing elements for flushing liquid can also be designed to be movable both laterally and longitudinally of the nozzle unit.
  • the washing jet 36 can be equally well provided e.g. directly between the nozzle parts 32 and 34 and the distributing chamber 37 for flushing liquid can be provided in the nozzle part 34.
  • a gas space 62 surrounding the flow plane can be given for example a substantially closed design, e.g. by means of an appropriate hood 60 which can further be designed movable. It is preferred that this gas space 62 be provided with air moisture and temperature regulation.
  • control of said gas space be adapted to a flow plane flushing and washing arrangement of the invention such that, in the event of breaks, the gas space surrounding the flow plane can be quickly established after a washing cycle in a condition as favorable as possible from the viewpoint of coating material layers.
  • the washing operation of a nozzle unit and the regulation of a gas space surrounding the flow plane are easily arranged to proceed automatically without actions performed by the staff. Drying of a flow plane can be performed not only by simple manual drying but also by means of automated scrapers, bars or the like 64 for removing water from the flow plane prior to a restart. Drying can also be performed, for example, by means of appropriate air blowing.
  • the delivery of a flushing liquid onto a flow plane can also be effected by way of one or several nozzle slots 30, 30b, 33.
  • such slots can instead be used during a break for the feeding of flushing liquid onto a flow plane.
  • this purpose is served by the topmost nozzle slot or, in any case, a nozzle slot located higher up than the topmost nozzle slot currently in coating material service.
  • the flushing liquid can be arranged to be supplied onto the flow plane 4 by way of the topmost nozzle slot 30b.
  • the feeding chamber and other passages can be preferably adapted to be drained of flushing liquid as soon as the washing cycle is finished and normal running is restored. Naturally, this applies also to other elements mentioned in optional embodiments for passing flushing liquid onto a flow plane. This way, a possible passage of flushing liquid onto a flow plane during normal operation is avoided.
  • the flushing is extended, in addition to the foregoing, also into the actual nozzle slots, as well as into flow paths and feeding chambers, on a counterflow principle.
  • the flushing liquid is arranged to flow from a flow plane into nozzle slots and further to internal members of the nozzle unit in a direction reverse with respect to the flow of coating materials.
  • this provides a beneficial effect on the efficiency of a cleaning process. Separate pressurization of flushing liquid is not necessary as it is possible to carry out washing and flushing by means of gravity alone.
  • the washing of an applicator beam effected as described above can be performed either as a continuous flow or the chambers and other flow paths can be filled with flushing liquid, its dissolving effect can be allowed an appropriate time and flushing can be continued with flowing flushing liquid in the next cycle.
  • the draining of feeding and distributing chambers filled with coating material prior to the application of flushing liquid can be arranged to proceed as appropriate or by means of the flushing liquid itself.
  • the flow of flushing liquid and thereby the effective extent of flushing and washing can be limited to desired members of an applicator beam, e.g. by means of existing valve elements or the like.
  • the washing of internal elements of the applicator beam can be performed as described by using a counterflow washing process through nozzle slots.
  • the process of restoring an applicator beam to a ready-to-operate condition it is possible to proceed as described above, i.e. the beam is supplied with full load of coating materials, the flushing and washing of the flow plane is initiated and readiness for a commencement of the coating process is maintained.

Landscapes

  • Coating Apparatus (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Abstract

La présente invention concerne un procédé d’amélioration de la facilité d’utilisation d’une encolleuse à rideau alimentée par pinces, qui est utilisée pour revêtir une nappe fibreuse et pour limiter la perte de matériaux de revêtement, ladite encolleuse à rideau comportant une unité de buse (1) qui comprend au moins deux parties de buse adjacentes (3, 3a, 32) et qui inclut une fente de buse (30) entre lesdites au moins deux parties de buse adjacentes, qui s’étend dans une direction longitudinale (W) du dispositif de revêtement et qui comporte un matériau de revêtement appliqué sur toute sa largeur et évacué par une sortie (31) de la fente de buse (30) sur un plan d’écoulement (4) établi par une surface supérieure des parties de buse. Dans le procédé, au cours d’une pause dans le procédé de revêtement de la nappe fibreuse, le plan d’écoulement (4) est rincé comme souhaité et autant de fois que souhaité à l’aide d’un liquide permettant de rincer le matériau de revêtement du plan d’écoulement (4) et d’empêcher le séchage du matériau de revêtement présent dans les fentes de buse (30). L’invention concerne également une installation permettant de réaliser le procédé.
PCT/FI2006/050359 2005-08-18 2006-08-17 Procédé et installation permettant d’améliorer la facilité d’utilisation d’une encolleuse à rideau alimentée par pinces et de limiter la perte du matériau de revêtement WO2007020332A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE112006002157T DE112006002157T5 (de) 2005-08-18 2006-08-17 Verfahren und Anordnung zur Verbesserung der Verwendbarkeit einer gleitbeschickten Vorhangstreicheinrichtung und zur Verringerung des Verlustes von Streichwerkstoffen

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI20055438A FI117642B (fi) 2005-08-18 2005-08-18 Menetelmä ja järjestely tasolta syöttävän verhopäällystimen käytettävyyden parantamiseksi ja päällysteaineen hukan vähentämiseksi
FI20055438 2005-08-18

Publications (1)

Publication Number Publication Date
WO2007020332A1 true WO2007020332A1 (fr) 2007-02-22

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI2006/050359 WO2007020332A1 (fr) 2005-08-18 2006-08-17 Procédé et installation permettant d’améliorer la facilité d’utilisation d’une encolleuse à rideau alimentée par pinces et de limiter la perte du matériau de revêtement

Country Status (3)

Country Link
DE (1) DE112006002157T5 (fr)
FI (1) FI117642B (fr)
WO (1) WO2007020332A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007000801A1 (de) 2007-10-01 2009-04-02 Voith Patent Gmbh Auftragsvorrichtung
DE102007000777A1 (de) 2007-09-27 2009-04-02 Voith Patent Gmbh Auftragsvorrichtung
WO2012052350A1 (fr) * 2010-10-18 2012-04-26 Voith Patent Gmbh Procédé de fonctionnement d'un dispositif d'application pour appliquer des agents d'application liquides à pâteux sous forme d'au moins un rideau tombant librement et dispositif d'application

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009054737A1 (de) * 2009-12-16 2011-06-22 Voith Patent GmbH, 89522 Vorhang-Auftragswerk

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020114893A1 (en) * 2000-12-20 2002-08-22 Lovelace Robert E. Method for preparing a coating hopper
WO2004027150A1 (fr) * 2002-09-20 2004-04-01 Metso Paper, Inc. Machine a coucher
JP2004105926A (ja) * 2002-09-20 2004-04-08 Ricoh Co Ltd 塗布装置の洗浄方法及び洗浄装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020114893A1 (en) * 2000-12-20 2002-08-22 Lovelace Robert E. Method for preparing a coating hopper
WO2004027150A1 (fr) * 2002-09-20 2004-04-01 Metso Paper, Inc. Machine a coucher
JP2004105926A (ja) * 2002-09-20 2004-04-08 Ricoh Co Ltd 塗布装置の洗浄方法及び洗浄装置

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Week 200427, Derwent World Patents Index; AN 2004-289729, XP003008951 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007000777A1 (de) 2007-09-27 2009-04-02 Voith Patent Gmbh Auftragsvorrichtung
DE102007000801A1 (de) 2007-10-01 2009-04-02 Voith Patent Gmbh Auftragsvorrichtung
WO2012052350A1 (fr) * 2010-10-18 2012-04-26 Voith Patent Gmbh Procédé de fonctionnement d'un dispositif d'application pour appliquer des agents d'application liquides à pâteux sous forme d'au moins un rideau tombant librement et dispositif d'application

Also Published As

Publication number Publication date
FI20055438A0 (fi) 2005-08-18
DE112006002157T5 (de) 2008-07-03
FI117642B (fi) 2006-12-29

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