EP3342928A1 - Dispositif d'application de rideau - Google Patents

Dispositif d'application de rideau Download PDF

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Publication number
EP3342928A1
EP3342928A1 EP16207285.4A EP16207285A EP3342928A1 EP 3342928 A1 EP3342928 A1 EP 3342928A1 EP 16207285 A EP16207285 A EP 16207285A EP 3342928 A1 EP3342928 A1 EP 3342928A1
Authority
EP
European Patent Office
Prior art keywords
curtain
application
application device
edge
treatment substance
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Withdrawn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
EP16207285.4A
Other languages
German (de)
English (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
Valmet Technologies 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 Valmet Technologies Oy filed Critical Valmet Technologies Oy
Priority to EP16207285.4A priority Critical patent/EP3342928A1/fr
Publication of EP3342928A1 publication Critical patent/EP3342928A1/fr
Withdrawn legal-status Critical Current

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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
    • 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

Definitions

  • the invention relates to a curtain application device for fiber machines, in particular for paper and board machines. More especially the invention relates to a curtain application device in accordance with features of the preamble part of claim 1.
  • surface treated such as coated or sized fiber web grades are becoming more and more popular and thus the process and equipment have increasing demands imposed thereon.
  • the surface of a fiber web is formed with a layer of treatment substance at an application station followed by drying.
  • the process of application can be divided in supplying the treatment substance onto the web surface, which is called the application of the treatment substance, as well as in the adjustment of final amount of treatment substance.
  • One important recently developed application technique is curtain application, which is suitable to surface treatment of paper and board webs. By curtain application good coverage of treatment substance on the web surface is achieved.
  • curtain application two main types of curtain application devices are used, namely curtain application devices with slot-fed and curtain application devices with slide-fed.
  • slide fed curtain application devices treatment substance is fed by means of a nozzle assembly onto an inclined plane and the treatment substance flows down towards an edge of the plane constituting a nozzle lip and the curtain is formed as the treatment substance falls off the nozzle lip onto the web.
  • slot-fed curtain application devices treatment substance is pumped through a distribution chamber into a narrow vertical slot and the curtain is formed at its lip and falls onto the web.
  • Treatment substance can be applied in one or more curtain layers.
  • the present invention relates to both out-board curtain application and in-board curtain application.
  • the present invention also relates to direct curtain application, in which the treatment substance is applied directly onto the fiber web, and to in-direct curtain application, in which the treatment substance is applied via a roll or corresponding transfer surface onto the fiber web.
  • curtain application edge guides are used to prevent reducing of the width of the curtain in vertical direction towards the application surface as in curtain application it is important that the width of the curtain stays required with the height of the curtain so that full-width treatment substance application is achieved.
  • the edge guides typically used in curtain application have a fixed length in direction of the curtain and thus are limited between the nozzle opening and the application surface and therefore extend on the same height level as the height of the curtain. Thus in cases the application process should require adjustment of the height of the curtain it is not possible to adjust the edge guides such that required effect to the process would be achieved.
  • the height position adjustment of the edge guides is needed for example in cases where the running speed of the fiber web varies or in cases where the amount of the treatment substance to be applied by the nozzle varies so that the curtain keeps its stability.
  • An object of the invention is to create a curtain application device in which the disadvantages of the prior art, especially relating to adjustment of the width and the height of the curtain in curtain application, are eliminated or at least minimized.
  • curtain application device according to the invention is characterized by the features of the characterizing part of claim 1.
  • Advantageous embodiments and features are defined in dependent claims.
  • each of the edge guides is movably in vertical direction attached to a frame part, which is attached to the frame structure of the application device.
  • height of treatment substance curtain created by the application device is adjusted by moving the application beam and the vertical location of the edge guides is adjusted independently from the vertical location of the application beam during running of the fiber web and during the application of the treatment substance.
  • length of the edge guides is greater than the distance between the nozzle opening and the surface onto which the treatment substance is first applied and that the edge guides extend through corresponding openings in the frame part.
  • the frame parts of the edge guides are in width direction adjustably attached to the frame structure of the application device, such that the location of the edge guide is adjustable during running of the fiber web and during application of the treatment substance.
  • each of the edge guides are connected to an actuator by which the adjustment of the vertical position of the edge guide is achieved.
  • the actuator is advantageously a cylinder attached to the upper end of the edge guide at one end and at the other end to a frame part of the application device, for example to the support beam of the application beam.
  • the actuator may also be attached to the application beam of the application device but in this case it is connected by mechanical transmission or by adjustment means with electrical measurement means to the height (vertical location) control of the application beam such that the change of the vertical location of the application beam is taken in account with the vertical location adjustment of the edge guides.
  • the vertical location adjustable edge guides provide the possibility of placing a deflection (start) plate, which is typically a movable plate under the curtain for at least collecting the treatment substance before and/or after the application of the treatment substance onto the application surface, under the application beam such that in the start of the application the edge guides are quickly lowered down to their working position, near the surface of the fiber web in direct application or the surface of the roll in in-direct application.
  • start deflection
  • the edge guides are quickly lowered down to their working position, near the surface of the fiber web in direct application or the surface of the roll in in-direct application.
  • the edge guides are located and stay in vertical position in respect of the direction of the movement of the fiber web, by which the adherence of the edges of the curtain to the edge guides is ensured as the edge guides are not turned in the direction of the movement of the fiber web as is needed in prior art arrangements.
  • each of the frame parts supporting the edge guides are connected to an actuator by which the adjustment of the width position of the edge guide is achieved.
  • edge guides are attached in-flow connection with the treatment substance chamber of the application device such that advantageous additional feed of the treatment substance can be provided to follow the edge guides.
  • the curtain application device is typically located in a finishing section of a fiber web production line, advantageously in a sizing section or in a coating section but the curtain application device can also be located in another section of a fiber web production line, for example in a wire section or in a press section or in a drying section or in a calendering section of a fiber web production line.
  • the curtain application device can be used for application of a sizing or coating agent in dry end of a fiber web production line or for fiber web sizing in the wire section or the press section.
  • the invention can be utilized both in cases where the treatment substance is directly applied onto the surface of the fiber web and in cases where the treatment substance is first applied onto a surface of a roll via which the treatment substance is guided onto the surface of the fiber web.
  • a small distance between the closest end of the edge guide and the surface of the roll is needed.
  • the distance between the closest end of the edge guide and the surface of the application surface or the roll is over 0 mm and less than 10 mm, advantageously less than 3 mm, so that the curtain is guided substantially its whole height by the edge guides.
  • the invention is advantageously utilized in connection with a nip formed between two rolls, in which in connection with both rolls the application device can be arranged and by both the treatment substance is applied indirectly via the corresponding roll and the nip onto the fiber web or in connection with one indirect application is used and by the other application device the treatment substance is applied directly onto the fiber web.
  • the nip may be formed between a hard roll and a soft roll or between two hard rolls or between two soft rolls.
  • the hard roll is a roll provided with hard surface, typically with ceramic or metallic surface (a roll with a ceramic or carbide coating having surface hardness 800 - 1600 HV0.3) and the soft roll is a roll provided with soft surface, typically formed by a polymer cover (a roll with a polymeric roll cover (rubber or polyurethane) having surface hardness 10 - 70 P&J, roll with a polymeric roll cover (rubber, polyurethane or composite) having surface hardness 80 - 100 shoreD.
  • a polymer cover a roll with a polymeric roll cover (rubber or polyurethane) having surface hardness 10 - 70 P&J
  • a polymeric roll cover rubber, polyurethane or composite
  • edge guides are in vertical direction in respect of the main place of the surface onto which the treatment substance is to be applied substantially vertically positioned as by this feature the best process adjustment in respect of height of the curtain is achieved.
  • the vertical position of the edge guides may be inclined towards the curtain, the inclination angle being 0-15°, advantageously 1-7°.
  • the edge guides are attached to the application beam movably in vertical direction.
  • the length of the edge guides is greater than the distance between the nozzle opening and the application surface and the edge guides extend through corresponding openings in the frame part such that height of the curtain can be adjusted by moving the application beam and the vertical location of the edge guides can be adjusted independently from the vertical location of the application beam during running of the fiber web and during the application of the treatment substance.
  • a vertically extending groove is on the edge guide located at the side of the curtain such that treatment substance flow increased and additional treatment substance can be guided along the groove and thus secure that the edges of the curtain will follow along the corresponding edge guides.
  • the groove of the edge guide extends from the free end of the edge guide i.e. the closest end of the edge guide in respect the surface onto which the treatment substance is applied to the treatment substance chamber of the application device.
  • the edge guides are attached to corresponding frame parts of the application device, which frame parts are fixedly attached or in width direction adjustably attached to the application device.
  • the location of each edge guide in width direction is independently from the other edge guide adjustable.
  • the edge guides are attached to the frame parts such that the position of the edge guide is adjustable in vertical direction such that the edge guide can be lifted or lowered during running of the fiber web and during running of the application of the treatment substance.
  • the edge guides are connected via the in width direction adjustable frame parts to the control structures of the width of the curtain.
  • the invention provides for from the curtain height adjustment independent adjustment of the vertical location of the edge guides.
  • the invention provides for adjustment of both width and height of the curtain in curtain application simultaneously during running of the fiber web and during application of the treatment substance.
  • the invention is very advantageous in cases where the treatment substance to be applied is size and the size is first applied onto a surface of a roll and via the surface of the roll onto the surface of the fiber web as in these cases it is very important that the width of the curtain remains full width along its substantially whole height.
  • Also by the invention is achieved easily adjustable location in vertical direction in respect of the surface of the fiber web or the roll independent from the vertical position of the application beam.
  • width of the curtain is meant the dimension of the curtain in width direction of the application surface i.e. in perpendicular direction to the main running direction of the fiber web.
  • the application surface is in direct curtain application the surface of the fiber web and in indirect application the surface of the roll or corresponding transfer surface, via which the treatment substance is guided onto the fiber web.
  • the upper and lower are used in respect of the flow direction of the curtain; upper being in direction of the beginning of the curtain and lower in direction of the end of the curtain.
  • the vertical direction is to be considered to be the perpendicular direction in view of the main plane direction of the fiber web and the main flow direction of the curtain.
  • the application device 10 extends in the cross direction in respect of the main running direction R of the application surface 30 substantially over the width of the application surface 30 as shown in figure 3 and that the other end of the application device 10 is corresponding.
  • the application surface 30 is in direct curtain application the surface of the fiber web and in indirect application the surface of the roll or corresponding transfer surface, via which the treatment substance is guided onto the fiber web.
  • FIG. 1 an example of an edge guide 20 of a curtain application device 10, in which the application beam 13 is a slide beam 13, which is used for applying the treatment substance onto the surface of the application surface 30.
  • the slide beam 13 comprises treatment substance chambers 14 from which the treatment substance is guided through the nozzle openings 14A to slide on top of the beam and over the front edge surface 13A to form a treatment substance curtain C that flows down onto the surface of the application surface 30.
  • the slide beam 13 is attached to the frame structure 11 of the application device 10 by support arm 12.
  • the vertical location H of the slide beam 13 in respect of the surface of the application surface 30 is adjustable and thus height of the curtain C is adjustable.
  • Width control means of the application beam 13 are denoted by reference numeral 15.
  • an edge guide 20 which is located against the front edge surface 13A of the application beam 13.
  • the edge guide 20 attached at its upper end to a frame part 21 such that it is movable in vertical direction i.e. the vertical location of the edge guide 20 is independently form the application beam 13 adjustable.
  • An actuator (not shown) can be used to adjust the vertical location of the edge guide 20.
  • the frame part 11 is attached to width control structure 22 of the edge guide 20 for width W adjustment of the edge guide 20.
  • the width control structure 22 can be connected to the width control means of the application beam 13.
  • At the lower end of the edge guide 20 can be located an additional curtain guide 23 for further ensuring the stability of the edge of the curtain C at its lower part.
  • an example of an edge guide 20 of a curtain application device 10 in which the application beam 13 is a slot beam 13, which is used for applying the treatment substance onto the surface of the application surface 30.
  • the slot beam 13 comprises a treatment substance chamber 14 from which the treatment substance is guided through the nozzle opening 14A to form a treatment substance curtain C that flows down onto the surface of the application surface 30.
  • the slot beam 13 is attached to the frame structure 11 of the application device 10 by support arm 12.
  • the vertical location H of the slot beam 13 in respect of the surface of the application surface 30 is adjustable and thus height of the curtain C is adjustable.
  • an edge guide 20 At the edge of the curtain C is located an edge guide 20, which is located at a small distance, advantageously 0,1-0,2 mm the front edge surface 13A of the application beam 13.
  • the edge guide 20 attached at its upper end to a frame part 21 such that it is movable in vertical direction i.e. the vertical location of the edge guide 20 is independently form the application beam 14 adjustable.
  • An actuator (not shown) can be used to adjust the vertical location of the edge guide 20.
  • the frame part 11 is attached to width control structure 22 of the edge guide 20 for width W adjustment of the edge guide 20.
  • At the lower end of the edge guide 20 can be located an additional curtain guide 23 for further ensuring the stability of the edge of the curtain C at its lower part.
  • a chute 16 is provided to collect any treatment substance flown from the nozzle opening 14A at the edge areas on the other side of the edge guide 20 in respect of the curtain C.
  • FIG. 3 In the example of figure 3 is shown an example of an edge guide 20 of a curtain application device 10, to form a treatment substance curtain C that flows down onto the surface of the application surface.
  • the edge guides 20 are attached to a frame part 21 such that it is movable in vertical direction i.e. the vertical location of the edge guide 20 is independently form the application beam 14 ( figs. 1 and 2 ) adjustable.
  • the edge guides 20 are in vertical direction in respect of the main place of the surface of the application surface 30 substantially vertically positioned.
  • the edge guides 20 may be inclined towards the curtain C, the inclination angle A being 0-15°, advantageously 1-7°.
  • a vertically extending groove 25 can be on the edge guide 20 located at the side of the curtain C such that treatment substance flow increased and additional treatment substance via flow channel 24 of the edge guide 20 for the additional treatment substance shown in figure 4C can be guided along the groove 25 and thus secure that the edges of the curtain C will follow along the corresponding edge guide 20.
  • the groove 25 of the edge guide 20 extends from the free end of the edge guide 20 i.e. the closest end of the edge guide 20 in respect the surface onto which the treatment substance is applied to the supply of the treatment substance of the application device 10.
  • the edge guides 20 are attached to the application beam 13 movably in vertical direction.
  • the length of the edge guides 20 is greater than the distance between the nozzle opening 14A and the surface of the application surface 30 and the edge guides 20 extend through corresponding openings in the frame part 21 such that height H of the curtain C can be adjusted by moving the application beam 13 and the vertical location H20 of the edge guides 20 can be adjusted independently from the vertical location H of the application beam 13 during running of the application surface 30 and during the application of the treatment substance.
  • the edge guides 20 are attached in-flow connection with the treatment substance chamber 14 of the application device 10 such that advantageous additional feed of the treatment substance can be provided to follow the edge guides 20.
  • the edge guides 20 are in vertical direction in respect of the main place of the surface of the application surface 30 substantially vertically positioned.
  • the edge guides may also be inclined towards the curtain C, the inclination angle A being 0-15°, advantageously 1-7°.
  • the edge guides 20 are attached to corresponding frame parts 21 of the application device 10, which frame parts 21 are fixedly attached (not shown) or in width direction adjustably attached to the application device (figures).

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  • Coating Apparatus (AREA)
  • Paper (AREA)
EP16207285.4A 2016-12-29 2016-12-29 Dispositif d'application de rideau Withdrawn EP3342928A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP16207285.4A EP3342928A1 (fr) 2016-12-29 2016-12-29 Dispositif d'application de rideau

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP16207285.4A EP3342928A1 (fr) 2016-12-29 2016-12-29 Dispositif d'application de rideau

Publications (1)

Publication Number Publication Date
EP3342928A1 true EP3342928A1 (fr) 2018-07-04

Family

ID=57755073

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16207285.4A Withdrawn EP3342928A1 (fr) 2016-12-29 2016-12-29 Dispositif d'application de rideau

Country Status (1)

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EP (1) EP3342928A1 (fr)

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3508947A (en) 1968-06-03 1970-04-28 Eastman Kodak Co Method for simultaneously applying a plurality of coated layers by forming a stable multilayer free-falling vertical curtain
US3968772A (en) 1969-03-26 1976-07-13 Eastman Kodak Company Curtain coating apparatus
US5330797A (en) 1991-06-18 1994-07-19 Agfa-Gevaert N.V. Curtain coater with displaceable edge guides and method
WO2003049870A1 (fr) * 2001-12-13 2003-06-19 Dow Global Technologies Inc. Procede et dispositif d'enduction au rideau
WO2006079678A1 (fr) * 2005-01-27 2006-08-03 Metso Paper, Inc. Appareil pour reguler la largeur d'application d'une coucheuse a nappe a alimentation par coulisse
DE102006030183A1 (de) * 2006-06-30 2008-01-03 Polytype Converting S.A. Vorhangbeschichter mit poröser Vorhangführungsstruktur, Vorhangführungsstruktur für einen Vorhangbeschichter und Verfahren zur Herstellung der Vorhangführungsstruktur
WO2009043700A2 (fr) * 2007-09-27 2009-04-09 Voith Patent Gmbh Dispositif d'application et procédé pour faire fonctionner un dispositif d'application
EP2474368A1 (fr) * 2009-08-31 2012-07-11 Voith Patent GmbH Guide latéral de coucheuse à nappe
EP2952264A1 (fr) * 2014-06-05 2015-12-09 Valmet Technologies, Inc. Dispositif de revêtement à rideau

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3508947A (en) 1968-06-03 1970-04-28 Eastman Kodak Co Method for simultaneously applying a plurality of coated layers by forming a stable multilayer free-falling vertical curtain
US3968772A (en) 1969-03-26 1976-07-13 Eastman Kodak Company Curtain coating apparatus
US5330797A (en) 1991-06-18 1994-07-19 Agfa-Gevaert N.V. Curtain coater with displaceable edge guides and method
WO2003049870A1 (fr) * 2001-12-13 2003-06-19 Dow Global Technologies Inc. Procede et dispositif d'enduction au rideau
WO2006079678A1 (fr) * 2005-01-27 2006-08-03 Metso Paper, Inc. Appareil pour reguler la largeur d'application d'une coucheuse a nappe a alimentation par coulisse
DE102006030183A1 (de) * 2006-06-30 2008-01-03 Polytype Converting S.A. Vorhangbeschichter mit poröser Vorhangführungsstruktur, Vorhangführungsstruktur für einen Vorhangbeschichter und Verfahren zur Herstellung der Vorhangführungsstruktur
WO2009043700A2 (fr) * 2007-09-27 2009-04-09 Voith Patent Gmbh Dispositif d'application et procédé pour faire fonctionner un dispositif d'application
EP2474368A1 (fr) * 2009-08-31 2012-07-11 Voith Patent GmbH Guide latéral de coucheuse à nappe
EP2952264A1 (fr) * 2014-06-05 2015-12-09 Valmet Technologies, Inc. Dispositif de revêtement à rideau

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