EP1851381B1 - A curtain coating method and a device for applying the same - Google Patents

A curtain coating method and a device for applying the same Download PDF

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Publication number
EP1851381B1
EP1851381B1 EP06708962A EP06708962A EP1851381B1 EP 1851381 B1 EP1851381 B1 EP 1851381B1 EP 06708962 A EP06708962 A EP 06708962A EP 06708962 A EP06708962 A EP 06708962A EP 1851381 B1 EP1851381 B1 EP 1851381B1
Authority
EP
European Patent Office
Prior art keywords
air
material web
point
stabilising
impact
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.)
Not-in-force
Application number
EP06708962A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1851381A4 (en
EP1851381A1 (en
Inventor
Heikki Vatanen
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
Publication of EP1851381A1 publication Critical patent/EP1851381A1/en
Publication of EP1851381A4 publication Critical patent/EP1851381A4/en
Application granted granted Critical
Publication of EP1851381B1 publication Critical patent/EP1851381B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/30—Processes for applying liquids or other fluent materials performed by gravity only, i.e. flow coating
    • B05D1/305—Curtain coating
    • 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
    • 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
    • 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
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/04—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to gases
    • B05D3/0406—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to gases the gas being air

Definitions

  • the present invention relates to a curtain coating method for coating a material web, in which method coating agent is applied from a curtain coater located above the material web, moving supported by a support element, as a curtain-like flow to a point of impact on the surface of the material web (W), boundary layer air being removed from the surface of the material web at a point in front of the point of impact.
  • the present invention further relates to a curtain coating device applying the method for coating the material web, the device comprising a curtain coater which is located above a moving material web supported by support elements, and from which the coating agent can be applied as a curtain-like flow to a point of impact on the surface of the material web, and boundary layer air discharge means for removing boundary layer air from the surface of the material web at a point in front of the point of impact.
  • Efforts have been made to eliminate the foregoing disadvantages, for example, in the manner known from the published application WO 03/053597 . It discloses air discharge means by which the boundary layer air is removed by suction at a point in front of the point of impact.
  • the publication further discloses two air inlets for controlling airflow in the space in front of the curtain. According to the publication, in front of the curtain the flows are controlled by means of a pressure sensor located in the space, the sensor providing control data to the air inlet. According to the publication, the airflow correlates with the pressure prevailing in the space.
  • air supplied to the space is removed by the same air discharge means as boundary layer air. The controllability of air discharge and air supply is not very good because discharge is utilised for two different purposes.
  • EP 1142647 is known a device, where there is a space in front of the curtain, to which gas is supplied by supply means provided in the space. In addition to creating the desired pressure, the purpose of this is to remove the layer of air travelling with the web and to replace it with a gas layer.
  • a gas exhaust chamber In front of the said space is, in addition, arranged a gas exhaust chamber with means for discharging gas from the space. The supply and discharge of gas are controlled on the basis of data received from the pressure sensor arranged in the space.
  • Second air supply means are in addition arranged in front of the exhaust chamber, the purpose of which is to remove the boundary layer air carried along with the material web travelling with the support of the roll.
  • the second air supply means are directed vertically, whereby the impact angle of the downwards directed air jet on the web is determined by the direction of travel of the web on the roll.
  • the direction of travel of the material web supported by the roll surface changes constantly.
  • the amount of air supplied through the second air supply means is controlled on the basis of data obtained from the said pressure sensor.
  • a curtain coater unit of a paper/board machine for coating a material web that comprises a frame element located above the material web, a curtain coater connected to the frame element, from which curtain coater the coating agent can be fed as a curtain-like stream onto the surface of the material web at an impact point, and boundary layer air exhaust means.
  • the aim of the present invention is to eliminate, or at least substantial lessen, the above-mentioned disadvantages.
  • the method according to invention is characterised in that to remove boundary layer air, air is supplied to the surface of the moving material web at an oblique angle with respect to the material web, so that the airflow has an opposite component with respect to the direction of travel of the material web, and that the pressure level in the impact point area is controlled by supplying stabilising air from a point in front of the impact point to the impact point area at an oblique angle with respect to the direction of travel of the material web, so that the airflow has a component parallel to the direction of travel of the material web, and by removing the stabilising air from a point before the stabilising air inlet.
  • the device applying the method according to the invention is characterised in that the air removing the boundary layer air by means of the boundary layer air discharge means can be supple to the surface of the moving material web at an oblique angle with respect to the direction of travel of the material web, so that the air has an opposite component with respect to the direction of travel of the material web, and that for controlling the pressure level in the impact point area, the device comprises stabilising air supplying means by which stabilising air can be supplied to a point in front of the impact point to the impact point area at an oblique angle with respect to the direction of travel of the material web, so that the air has a component parallel to the direction of travel of the material web, and stabilising air discharge means arranged at a point in front of the stabilising air supply means.
  • the air/gas pressures or flows in the space behind the curtain do not need to be controlled very accurately over the whole distance between the coating device because the supply and discharge of stabilising air can be accurately directed to the impact point area.
  • the method also makes it possible to remove the boundary layer air and control the stabilising air at as short a distance as possible from one another.
  • the control of the stabilising air is separated by a simpler construction than before from the control systems relating to boundary layer air discharge, whereby the operation of both can be still better controlled.
  • the instruments relating to the discharge of the boundary layer can be located at a greater distance from the material web than before. This space-saving method and the device for applying it also make it possible to support the material web by other means than merely the roll.
  • FIG. 1 thus shows a curtain coater or an application beam according to the present invention, which is marked with reference numeral 1.
  • the curtain coater 1 is essentially located above a material web W travelling on its track. In the direction of travel, at the curtain coater, the track is comprised of a support element 3, against which the material web W rests.
  • the surface of the support element 3 supporting the material web W may be straight or curved.
  • the support element 3 is preferably an immobile support shoe, but as a support element may also be used a support roll, with the mantle of which the material web moves along a part of the circumferential course of the support roll.
  • a curtain 2 of the coating agent having essentially the width of the material web W, the curtain being applied from the desired height to the point of impact 22 on the surface of the material web W.
  • boundary layer air 4 discharge is provided.
  • the discharge is accomplishes by the means.9, 10, 13, 16 and 21 intended for boundary layer air 4 discharge.
  • These include an air supply duct 13 bordered by walls 9 and 10, at the end of which is arranged a nozzle part 21, through which the direction of the air 5 supplied can be adjusted as desired with respect to the direction of travel of the material web, so that the air has an opposite component with respect to the direction of travel of the material web.
  • the amount and velocity of the air 5 discharging the boundary layer air is preferably adjusted by means of a blower 16.
  • the amount of the air 5 discharging boundary layer air 4 is sufficient and its direction is correct when it prevents the boundary layer air 4 from proceeding on the material web W and in addition directs the boundary layer air 4 from the surface of the material web W to the surroundings, for example, as shown in the Figure by arrows 4a, in front of the means 9, 10, 13, 21.
  • stabilising air supply means and stabilising air discharge means are arranged between the dripping curtain 2 and the boundary layer air discharge means 9, 10, 13, 21.
  • the stabilising air supply means include a stabilising air 6 supply duct 15 bordered by walls 11 and 12 (and end walls, not shown).
  • the end of the supply duct forms a nozzle 12a, by means of which stabilising air 6 is supplied in a controlled manner to the impact point area, preferably over the whole width of the material web W.
  • the nozzle 12a is made to direct the stabilising air 6 as desired with respect to the direction of travel of the material web W.
  • the direction of travel of the supplied air 6 is arranged at an oblique angle with respect to the direction of travel of the material web W, the air having a component parallel with the direction of travel of the material web W.
  • the angle between the direction of travel of the supplied air 6 and of the component of the supplied air 6 parallel with the direction of travel of the material web W, in other words the angle of impact between the supplied air 6 and the material web W is, for example, 10-80°, preferably 25-65°.
  • the amount and velocity of the stabilising air 6 is preferably adjusted by means of a blower 18 arranged in conjunction with the supply duct 15.
  • the stabilising air discharge duct 14 is preferably arranged between the boundary layer air discharge means and the stabilising air supply means.
  • the stabilising air discharge duct 14 is formed between a wall 10 comprised in the boundary layer air discharge means and a wall 11 comprised in the stabilising air supply means.
  • the discharge duct 11 is preferably also comprised of separate walls, whereby stabilising air supply and discharge can be better controlled.
  • the amount and velocity of the stabilising air 7 to be removed is preferably adjusted by means of a blower 17 arranged in conjunction with the supply duct 14. Since the amount of stabilising air supplied is known, in addition to the stabilising air to be discharged is also known the amount of air discharged from the space in front of the curtain. It should be mentioned that instead of the blowing and suction means 16, 17, 18, other devices may also be used for supplying and discharging air, such as ejectors and injectors operating in a known manner.
  • the pressure level in the area in front of the impact point is preferably controlled by adjusting the amount of stabilising air 6 supplied and at the same time the amount of stabilising air 7 removed. This is done by adjusting the blasting output of the blowers 17 and 18, for example on the basis of predetermined control variables, such as web speed and coating agent composition. In addition, the quantitative ratios of supplied and discharged stabilising air may be adjusted. Directed stabilising air 6 supply and discharge makes possible the stabilisation of the curtain 2 specifically in the impact point area. This means that the rest of the space 20 remaining in front of the curtain does not need to be controlled. It is, however, preferable to ensure that essentially the same conditions prevail in this space as behind the curtain.
  • the space 20 may be limited from the point in front of the curtain by a space-limiting wall 19 or the like, which may be moved in the direction of travel of the material web W.
  • a space-limiting wall 19 In conjunction with the wall 19 is provided an opening, through which air may flow freely into the space 20, in order to ensure that the same conditions prevail both in front of and behind the curtain.
  • the control variable of the supply and discharge (amounts) of stabilising air may be the location of the dripping curtain 2 or of the impact point 22.
  • the dripping curtain 2 may move in the direction of travel of the material web in such a way that the point of impact 22 will also move in the direction of travel of the material web.
  • suitable monitoring equipment 23 for example, a non-contacting distance gauge 23, such as a laser gauge.
  • the gauge 23 is used to measure the distance between the impact point 22 and the gauge 23, a deviation from which, from a predetermined value or between two values, indicates disadvantageous movements of the impact point and thus of the curtain.
  • the measurement data obtained from the distance gauge 23 may be transmitted as control data to the stabilising air supply and discharge means 17 and 18, whereby any disturbances in the conditions affecting the curtain 2 can be compensated for.
  • Other types of monitoring equipment, such as a line camera, are also suitable for monitoring the location.
  • the discharge of stabilising air and the supply of stabilising air may thus be separately adjustable.
  • This arrangement also makes it possible for the supplied and discharged stabilising air 5 and 6 to create a continuous airflow 8, which supports the curtain 2 within the impact point 21 area.
  • the discharge point that is, the end of the discharge duct 14 may be located at a desired point with respect to the point of supply (nuzzle 12a). This point is preferably immediately, in front of the supply point. This ensures for its part that the supplied stabilising air 6 will not "escape" from the impact point area to elsewhere in the space 20.
  • the arrangement according to Figure 1 is particularly well suited for devices with high material web speeds, for example, 2100-1200 metres/minute at most.
  • Figure 2 shows a structural modified embodiment of a curtain coater, which is particularly well suited for devices with low material web W speeds, for example, less than 1200 m/min.
  • the structural details shown in Figure 2 are marked with the same reference numerals as in Figure 1 and are thus not discussed in greater detail here.
  • the boundary layer air 4 is removed in essentially the same manner as in the embodiment according to the invention.
  • the stabilising air 6 supply to the surface of the material web is directed at a distance in front of the impact point 22, however, in the impact point 22 area.
  • the stabilising air discharge duct 14 is arranged immediately behind the stabilising air supply means 15.
  • the airflow accompanying the curtain 2 maybe removed in a controlled manner, especially from the space 2 in front of the curtain 2 in the impact point area 22.
  • the conditions behind the curtain 2 can be maintained appropriate to obtain as good an application result as possible.
  • Through the discharge duct 14 may, if necessary, also be discharged boundary layer air 4, if it has entered behind the boundary layer air discharge means to the point where stabilizing air 7 is being removed.

Landscapes

  • Application Of Or Painting With Fluid Materials (AREA)
  • Coating Apparatus (AREA)
EP06708962A 2005-02-25 2006-02-10 A curtain coating method and a device for applying the same Not-in-force EP1851381B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI20055094A FI120982B (fi) 2005-02-25 2005-02-25 Verhopäällystysmenetelmä ja sitä soveltava laite
PCT/FI2006/050058 WO2006090008A1 (en) 2005-02-25 2006-02-10 A curtain coating method and a device for applying the same

Publications (3)

Publication Number Publication Date
EP1851381A1 EP1851381A1 (en) 2007-11-07
EP1851381A4 EP1851381A4 (en) 2011-06-15
EP1851381B1 true EP1851381B1 (en) 2012-05-16

Family

ID=34224304

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06708962A Not-in-force EP1851381B1 (en) 2005-02-25 2006-02-10 A curtain coating method and a device for applying the same

Country Status (4)

Country Link
EP (1) EP1851381B1 (fi)
JP (1) JP4751895B2 (fi)
FI (1) FI120982B (fi)
WO (1) WO2006090008A1 (fi)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI120982B (fi) * 2005-02-25 2010-05-31 Metso Paper Inc Verhopäällystysmenetelmä ja sitä soveltava laite
FI121547B (fi) * 2008-02-11 2010-12-31 Metso Paper Inc Menetelmä päällysteverhon stabiloimiseksi verhopäällystyksen yhteydessä ja menetelmää soveltava järjestely
JP5510785B2 (ja) * 2009-09-25 2014-06-04 大日本印刷株式会社 塗布装置および塗布方法
FI20185867A1 (fi) 2018-10-15 2020-04-16 Valmet Technologies Oy Menetelmä monikerrosrainan liimaamiseksi ja muodostusosa monikerrosrainaa varten

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0365266A (ja) * 1989-08-03 1991-03-20 Fuji Photo Film Co Ltd 塗布方法及び装置
CA2101358C (en) * 1992-09-11 2000-10-24 Wayne A. Damrau Fountain applicator for coating a paper web and method
DE19829449A1 (de) * 1998-07-01 2000-01-05 Voith Sulzer Papiertech Patent Auftragsvorrichtung und Auftragsverfahren
JP3625254B2 (ja) * 1998-12-11 2005-03-02 三菱製紙株式会社 塗布装置
JP3676182B2 (ja) * 2000-04-03 2005-07-27 三菱重工業株式会社 塗工装置および塗工方法
CA2469292C (en) * 2001-12-13 2011-06-07 Dow Global Technologies Inc. Method and apparatus for curtain coating
FI115407B (fi) * 2003-06-26 2005-04-29 Metso Paper Inc Paperi-/kartonkikoneen verhopäällystinyksikkö
FI120982B (fi) * 2005-02-25 2010-05-31 Metso Paper Inc Verhopäällystysmenetelmä ja sitä soveltava laite

Also Published As

Publication number Publication date
FI20055094A0 (fi) 2005-02-25
WO2006090008A1 (en) 2006-08-31
JP2008529771A (ja) 2008-08-07
EP1851381A4 (en) 2011-06-15
FI20055094A (fi) 2006-08-26
EP1851381A1 (en) 2007-11-07
FI120982B (fi) 2010-05-31
JP4751895B2 (ja) 2011-08-17

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