EP1801289A1 - Procédé et appareil d'application d'un produit d'application sur une bande de materiau en movement - Google Patents

Procédé et appareil d'application d'un produit d'application sur une bande de materiau en movement Download PDF

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Publication number
EP1801289A1
EP1801289A1 EP06122788A EP06122788A EP1801289A1 EP 1801289 A1 EP1801289 A1 EP 1801289A1 EP 06122788 A EP06122788 A EP 06122788A EP 06122788 A EP06122788 A EP 06122788A EP 1801289 A1 EP1801289 A1 EP 1801289A1
Authority
EP
European Patent Office
Prior art keywords
medium
edge
material web
application
curtain
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Withdrawn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
EP06122788A
Other languages
German (de)
English (en)
Inventor
Dennis Partheymüller
Robert Reisenauer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Voith Patent GmbH
Original Assignee
Voith Patent GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Voith Patent GmbH filed Critical Voith Patent GmbH
Publication of EP1801289A1 publication Critical patent/EP1801289A1/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Withdrawn legal-status Critical Current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
    • B05C5/005—Curtain coaters
    • 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
    • B05C11/1039—Recovery of excess liquid or other fluent material; Controlling means therefor
    • 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
    • B05C5/001—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work incorporating means for heating or cooling the liquid or other fluent material

Definitions

  • the invention relates to a method and a machine for applying liquid or pasty application medium to a moving material in a running direction web, in particular a fibrous web, preferably a paper or board web, by means of a curtain applicator, which the application medium from a dispensing opening arrangement, in particular slot nozzle, directly or through the intermediary of at least one guide surface in the form of a curtain moving under the influence of gravity and possibly under the influence of further forces towards a moving surface, whereby the surface of the material web is for direct application of the substrate and the surface of an indirect application of the running surface Transmission element, preferably a transfer roller is, which then transfers the application medium to the surface of the material web.
  • a curtain applicator which the application medium from a dispensing opening arrangement, in particular slot nozzle, directly or through the intermediary of at least one guide surface in the form of a curtain moving under the influence of gravity and possibly under the influence of further forces towards a moving surface, whereby the surface of the material web is for direct application of the substrate and the surface of an
  • An unsatisfactory solved problem is a per se undesirable Actuation of the end faces of the material web edges and optionally adjacent surface areas of the other surface of the material web with application medium. If applied directly over the entire width of the material web, so-called application medium or color miscimeters (fine application medium fins or application medium veils between the curtain edges and the end faces of the web edges) form, which result in comparatively much application medium remaining on the end surfaces and possibly even on the other Surface or the bottom of the web passes.
  • the curtain applicator downstream subordinate support and guide components such as guide rollers, backup rollers, Airturns and the like, are polluted with application medium. Undesirable are also resulting clumped web edges, which also show up on wound on a reel material web winding and can interfere with further processing.
  • EP 1 003 934 B1 is separated at a greater width than the material web having curtain on both sides before hitting the curtain on the moving web of curtain edge by means of a respective separator and discharged the application medium of the separated curtain edge by means of at least one Ab.rabitess about trough-shaped running separator. Color menus, as mentioned, so can not occur.
  • the general object of the invention is to avoid or at least mitigate such problems, in particular problems in connection with the division of the curtain at the material web edge or in the vicinity of the material web edge.
  • This object is achieved by provisions or means for avoiding or reducing the order of application medium on the end face of at least one of the two side edges of the web and / or at least partially subsequent removal of applied to the face or end faces application medium and / or by precautions or Means for avoiding or reducing the application of application medium to the other surface, or better said, the underside of the material web, in particular in at least one region near the edge as a result of applying to the surface or top of the web or / and at least partially subsequent removal of the other surface or underside applied application medium and / or by arrangements or means for avoiding or reducing a surplus order of application medium in a region near the edge of the surface or upper side of the material web and / or zumind est partial subsequent removal or / and distributing a resulting from such a surplus order coating overflow in the near-edge area.
  • the curtain can hit a web of material on the web in an impingement line.
  • the curtain hits in a line of impact on one on the other surface, better said the bottom at least partially supported area of the web.
  • the machine may have a nozzle arrangement, by means of which the end face or the near-edge region of the underside before the application zone or in the application zone with the barrier medium, in particular a fluid barrier medium, can be acted upon.
  • a marginal area of the top to which the Applying the application medium is applied before reaching the application zone or in the application zone with a medium, in particular with a barrier medium, which counteracts adhesion of application medium in the surface region, and / or as a dilution medium, which dilutes the applied application medium acting medium.
  • the nozzle arrangement of the machine according to the invention can be designed accordingly. It has been shown that the application of the barrier medium or dilution medium close to the material web surface, in particular adjacent to the material web edge, assists in a clean division of the curtain at the material web edge and, to a certain extent, counteracts the meniscus formation.
  • a fluid preferably a liquid or a fluid settling on the material web as liquid or liquid droplets
  • a barrier medium preferably a liquid or a fluid settling on the material web as liquid or liquid droplets
  • Particularly suitable can be used as a barrier medium, a polar fluid.
  • the barrier medium used is water, steam, alcohol and oil or a mixture of at least two of these media.
  • the near-edge region of the upper side, to which the application medium is to be applied, can be charged with the same medium or the same media, in particular those of the addressed media, which can also serve as a dilution medium at the same time, ie in particular water and alcohol.
  • a mechanical barrier arrangement provided in the region of an application zone in which the application medium is applied to the surface or upper side of the material web influences the application medium on the end face counteracts at least one of the two edges of the material web and / or on at least one region near the edge of the underside of the material web.
  • the machine can be equipped for this purpose with a corresponding mechanical barrier arrangement.
  • the mechanical barrier arrangement according to the invention is also very effective for counteracting application medium menisci formation, in particular even at relatively high speeds, for example, based on an average viscosity of the application medium, at speeds of more than 1000 m / min for the above-mentioned application weight.
  • the mechanical barrier arrangement can also be suitably combined with a downstream mechanical treatment. It is particularly effective to use both the barrier medium and the mechanical barrier arrangement.
  • the barrier arrangement has a surface lying on the underside of the material web and, if desired, the material web partially supporting surface, which preferably extends laterally beyond the edge of the material web.
  • the curtain meets the impact line on the material web and laterally thereof in a barrier line extending beyond the edge of the material web onto the surface of the barrier structure.
  • the surface of the barrier arrangement is stationary and a surface area extending beyond the edge of the material web merges into a discharge surface which is designed for the removal of the coating medium from the side.
  • the barrier arrangement has at least one running in the running direction or in the transverse direction to the material web in the direction of the edge of the material web or away from the material web running surface.
  • the surface may be formed by the surface of an endless belt or a rotatably mounted circular cylindrical body.
  • Particularly useful is the variant with running in the transverse direction or obliquely to the direction of the web material surface, the collected application medium away from the edge of the web away and counteracts in the sequence, based on the viscosity of the application medium, an action on the end face of the web edge.
  • the running surface of the barrier arrangement may be associated with a cleaning arrangement preferably having at least one scraper and / or at least one spray nozzle for removing application medium from the running surface.
  • the running surface passes through this cleaning assembly.
  • the running surface can be exposed to a barrier medium, which counteracts adhesion of application medium to the running surface.
  • a barrier medium for example, water, steam, alcohol and oil or a mixture consisting of at least two of these media may be used.
  • the application medium is applied directly to the material web, as implied implicitly.
  • the curtain has at least the width of the material web, is preferably wider than the material web and meets in an over the entire width of the material web extending impingement on the material web. Outside the edges of the material web, the curtain can be guided laterally on an edge guide arrangement or can be guided, at least over a partial area of its drop height.
  • the end face or the surface area close to the edge of the other surface that is the region of the lower side of the material web close to the edge
  • a region near the edge of the surface provided with application medium or Top of the web is treated mechanically after passing through the application zone to remove adhering medium, in particular adhering application medium, at least partially.
  • a barrier medium such as oil
  • the mechanical treatment also useful to remove this barrier medium.
  • the machine according to the invention may have a corresponding treatment arrangement.
  • the end face or the near-edge region of the upper side can be charged with a fluid flow in order to blow off the medium or to spray it off or wash it off.
  • the treatment arrangement of the machine may comprise a nozzle arrangement provided for this purpose.
  • a liquid flow may be applied to the end face or the edge-side upper side region in question.
  • Another possibility is a loading of these material web areas with a gas stream.
  • a fluid from the group consisting of air, steam, water and alcohol or a mixture of members of this group is used to form the fluid stream.
  • an application medium overshoot resulting from an excess application of application medium is at least partially mechanically removed in a near-edge region of the upper side of the material web or in a corresponding surface region of the transfer element and / or via the Surface, in particular the near-edge top area is distributed.
  • the machine can be equipped with a corresponding treatment arrangement.
  • This invention proposal aims primarily, but not exclusively, that a curtain edge area, for example, according to the known solution according to EP 1 003 934 B1 above the running material web (in the case of a direct order) or - also to be considered - above the running surface of the transfer element (in the case of an indirect order) separated or cut off by means of a respective separating element, whereby the problematicinmenmenisisken in the case of direct order between the edges of the web and the curtain edges can not occur.
  • Such Auftreilung or division of the curtain over the material web at a certain distance to the material web edge is therefore particularly effective for high machine speeds, for example, greater than 1000 m / min for the example specified job and medium parameters.
  • the remaining after the known solutionindiumüberhöhungen on the web surface can be well mastered according to the invention proposal, so that a high order quality guaranteed and follow-up problems in the machine can be avoided.
  • the application medium superelevation can advantageously be applied to a fluid flow in order to at least partially blow off or spray off the application medium superelevation and / or to disperse it.
  • the treatment arrangement can be designed with a corresponding nozzle arrangement.
  • the fluid flow is directed or can be directed by means of at least one fluid nozzle arranged above or adjacent to the surface against the application medium superelevation or the top side, such that the fluid flow is directed laterally toward the edge of the material web or towards an edge of the transmission element Speed component has.
  • a so-called "Air knife” known per se air knife
  • a correspondingly arranged fluid nozzle for example an "air knife”
  • the treatment arrangement can be provided in the region of a free web tension or alternately in the region of a support or deflecting element over which the material web runs with its underside.
  • the application medium overshoot is subjected to a liquid flow.
  • the application medium increase can be acted upon by a gas stream.
  • a fluid such as air, steam, water and alcohol or a mixture thereof is used to form the fluid stream.
  • the application medium superelevation be acted upon by at least one mechanical element in order to at least partially remove and / or distribute the application medium superelevation.
  • the treatment arrangement can have at least one mechanical element provided for this purpose.
  • the mechanical element is embodied as only locally in the surface or upper side region or effective doctor element (for example doctor blade known per se) and the application medium superimposition is doctored off or abrakelbar using this element.
  • the mechanical element may have a surface of action or movement that preferably runs or can be moved in the running direction of the material web or of the substrate, which is pressed against the application medium superelevation or can be pressed.
  • the traveling surface may be formed, for example, by the surface of an endless belt or the above-mentioned rotatably mounted circular cylindrical body.
  • the movable or running surface of action may advantageously be associated with a cleaning arrangement, preferably comprising at least one scraper and / or at least one spray nozzle, for removing application medium from the action surface which passes through the cleaning arrangement during operation.
  • the action surface In order to avoid a firm adhesion of application medium to the action surface, it can be acted upon by a barrier medium, which counteracts adhesion of application medium to the action surface.
  • the action surface may be associated with a nozzle arrangement, by means of which the action surface can be acted upon by the barrier medium.
  • a medium consisting of water, steam, alcohol and oil or a mixture thereof can be used as the barrier medium.
  • such a process control can advantageously be such that a given application thickness of the application medium superelevation is reduced to a desired thickness by the mechanical action.
  • the curtain is wider than a desired application width on the material web in an upper range of motion, and that at least one edge of the curtain before hitting the curtain the running substrate is separated by means of at least one respective separating element and the application medium of the separated curtain edge is removed by means of at least one separate discharge element or at least one discharge section of the separating element.
  • the machine can be equipped with at least one corresponding separating element or discharge element.
  • the desired application width may be narrower than the width of the web.
  • the separating element separates the curtain above the region near the edge of the upper side of the material web or of the corresponding surface region of the transfer element, for which purpose the separating element is arranged correspondingly in the machine.
  • the curtain is at least over a portion of its fall height above the separating element laterally guided on an edge guide arrangement and is feasible. It is also proposed that the curtain remaining after the separation of the curtain edge is guided or can be guided laterally, at least over a partial area of its remaining drop height, on one / of the edge guide arrangement, in particular a guide surface of the separating element.
  • the invention and further development proposals come after the second aspect It would also be easy to apply in the case of indirect application.
  • the proposals for invention and further development according to the second aspect are primarily aimed at applying the application medium directly to the material web or when the machine is designed for a direct application to the material web.
  • a division of the curtain at the edge or edges of the material web into the web coating material applied to the material web and laterally of the material web this passing, falling into a receiving and Ab technologicalan extract curtain edge areas is promoted or facilitated to avoid loading of the web on the end face of the respective edge and / or on the underside of the web with application medium or reduce in particular by avoiding or reducing the application medium loop extending between the edge of the material web and the adjacent edge of the curtain edge region passing through the material web (here also referred to as meniscus).
  • the machine is designed for direct application to the material web up to an edge of the material web or over the entire material web width up to both edges of the material web, the machine being designed to divide the curtain at the edge or the edges of the material web in the application medium applied to the material web and laterally of the material web to promote or facilitate this passing, falling into a receiving and Ab technologicalanssen curtain edge areas to loading the web on the end face of the respective edge and / or to avoid or reduce at the bottom of the web with application medium, in particular by avoiding or reducing application medium veiling extending between the edge of the web and the adjacent edge of the curtain edge region passing the web.
  • the method according to the third aspect can be characterized in that the curtain is provided with at least one property varying over its extent in the transverse direction to the running direction, in particular a varying thickness or / and a varying viscosity or / and a varying solids concentration or / and a varying Temperature.
  • the machine is configured with the curtain such a varying property imparting means. It has been found that, above all, a variation in the thickness of the curtain or / and the viscosity of the curtain medium achieved directly or indirectly is effective in assisting curtain division and suppressing the formation of coating medium or at least the extent or adverse effect thereof to reduce.
  • the curtain be formed in a curtain area overlapping the edge of the material web or passing after the division, with a smaller thickness and / or a lower viscosity and / or a lower solids concentration.
  • the curtain area overlapping the edge of the material web or passing it after the division (hereinafter also referred to as edge zone) is significantly thinner than the curtain area falling on the material web (also referred to below as the main zone) can be, for example, about half as thick.
  • the edge zone has a thickness of approximately 98% of the main zone, better a thickness of approximately 95% of the main zone and most preferably a thickness equal to or less than approximately 90% of the main zone. Particularly favorable appears a thickness of the edge zone in the range of 50 to 90% of the thickness of the main zone.
  • the edge zone may expediently reach into the web region up to 50 cm, preferably up to 20 cm, particularly suitably up to 5 cm. However, it is also considered that the edge zone overlaps only a few millimeters with the material web or connects directly to the web edge.
  • a dilution of the application medium for example with water and / or a reduction of the solids concentration and / or influencing at least one other viscosity-influencing parameter into consideration.
  • the viscosity can also be lowered by special aids or by heating the application medium.
  • the discharge opening arrangement associated with the edge of the material web overlapping or passing after the division curtain area has a lower effective opening width and / or application medium-discharge flow rate than in Assigned to a falling on the web of curtain area (curtain main zone).
  • the application medium flowing to the discharge opening arrangement or the application medium exiting or leaving the discharge opening arrangement is an auxiliary medium, in particular Dilution medium, preferably water, is supplied locally, in order to reduce the viscosity or solid concentration in the overlapping with the edge of the material web or passing after the division curtain area.
  • the machine may have an auxiliary medium supply arrangement, by means of which the auxiliary medium is correspondingly locally supplied.
  • a further, likewise very expedient possibility is that the curtain is subjected to a fluid auxiliary medium, in particular a dilution medium, in the curtain area which overlaps the edge of the material web or which passes after the division.
  • the machine may have an auxiliary medium supply arrangement, by means of which the curtain in addressed curtain area can be acted upon by the auxiliary medium.
  • the auxiliary medium used is an auxiliary liquid, preferably water, acting preferably on the curtain in the form of spray or mist droplets, or an auxiliary fluid, preferably steam, provided on the basis of an auxiliary liquid.
  • the auxiliary medium supply arrangement may have a nozzle or atomizer arrangement.
  • the fluid auxiliary medium can be sprayed against the curtain or be sprayable by means of the nozzle arrangement.
  • the fluid auxiliary medium is fed to a space region which is preferably delimited by a wall above the level of the surface of the material web in which the curtain area overlaps the edge of the material web or passes after the division at least in the fall of this curtain area to fill with the auxiliary medium.
  • the machine can be designed accordingly and in particular have a corresponding wall.
  • the curtain edge zone has a higher application medium temperature at least in the height region of the material web, ie when the curtain impacts the material web than in the curtain fabric. Main zone, so that the viscosity is lowered and, accordingly, the curtain division is facilitated.
  • a heat radiator arrangement is provided which heats the curtain locally in the edge zone.
  • the discharge opening arrangement or the application medium supply or application medium absorption can be carried out with a heating device for locally heating the application medium forming the curtain.
  • the area of the curtain overlapping with the edge of the material web or passing through it after the division can address the material web pass corresponding, falling into a receiving and Abtechnologyanssen curtain area.
  • the curtain area which overlaps the edge of the material web or passes through it after the division may be a partial region of the curtain area which passes through the material web and falls into a receiving and threading arrangement.
  • the curtain outside the curtain area, in particular at its outer edge have a greater thickness and / or viscosity.
  • the curtain outside the edges of the web at least over a portion of its fall height can be guided laterally on a border guide arrangement or be feasible.
  • At least one edge strip of the material web is cut after application of the application medium to order medium on the end face of the respective edge of the web or / and on the underside of the web in a near-edge Remove area of the bottom or / and adiremediumüberhöhung in an area near the edge of the top of the web.
  • the machine may have a cutting arrangement, by means of which at least one edge strip of the material web can be cut off after application of the application medium to application medium on the end face of the relevant edge of the web or / and on the underside of the web in a region near the edge of the bottom or / and to remove adiremediumüberhöhung in a near-edge region of the top of the web.
  • the cutting arrangement may, for example, comprise at least one cutting blade, for example a cutting disc or circle cutting edge, at least one high-pressure jet cutting device or at least one laser beam cutting device.
  • the cutting of the material web edge can in online operation and that after applying, preferably before the passage of a dryer arrangement, to avoid soiling of the following machine components and at the same time to achieve a clean material web edge.
  • the invention generally also relates to a device, in particular a machine, for carrying out the method according to the invention, with devices for realizing the various method steps.
  • the invention and further training proposals according to the first, second, third and fourth aspects can be combined. Particularly useful is a combination of the invention and training suggestions according to the first and third aspects, if desired, in addition, in combination with the invention and training proposals according to the fourth aspect. In general, a combination of the proposals for invention and further education according to the fourth aspect is expediently considered in each case with the proposals for invention and further training according to the first, second and third aspects.
  • Fig. 1 shows a coating machine 10, which is for offline coating at least on one side of a fibrous web 12, in particular a paper or board web 12, is provided. Alternatively, it may be a coating section 10 of a machine for producing the fibrous web, in particular paper or board web, which sweeps the fibrous web 12 on at least one side during online operation.
  • the painting is carried out by a curtain applicator 14, which has a coating head 16 which emits a curtain 18 of coating color from a slot nozzle, not shown, which falls due to gravity on the upper web surface and the top 20.
  • the application with the curtain can - as shown in Fig. 1 - take place in the region of a free fibrous web train or alternatively in a region in which the fibrous web 12 is supported, for example by a support roller or pulley.
  • the applicator 14 is equipped with the coating head 16 upstream nozzle assemblies 24 and 26, a barrier medium, such as a liquid such as water, especially on the two-sided edge end surfaces 22, as well as on near-edge areas of the top 20 to be painted and the lower Spray surface or underside 28.
  • a barrier medium such as a liquid such as water
  • the barrier medium applied to marginal surface areas of the upper side 20 can also fulfill a dilution function for the coating color and promote the division of the curtain at the edge of the curtain.
  • the coating head 16 is followed by an aftertreatment arrangement in the direction of the fibrous web 12 which in association with the two web web edges respectively has a nozzle arrangement 30 for spraying the edge end face 22 and the region near the edge of the underside 28 with a washing liquid, for example water, and a nozzle arrangement 32 arranged above the fibrous web, for example in the manner of a so-called "air knife” for directing an obliquely outwardly directed air jet against the surface region near the edge of the upper fibrous web side (upper side) 20 for blowing off excess coating.
  • a washing liquid for example water
  • a nozzle arrangement 32 arranged above the fibrous web, for example in the manner of a so-called "air knife” for directing an obliquely outwardly directed air jet against the surface region near the edge of the upper fibrous web side (upper side) 20 for blowing off excess coating.
  • FIG. 2 schematically shows the cover of the edge end face 22 and of a surface region 34 of the underside 28 near the edge with sprayed-on barrier medium 36.
  • the coating color which has just been deposited or deposited on the upper side 20 is designated by 38.
  • the curtain is separated at the fibrous web edge and the falling past the fibrous web curtain edge region falls into a discharge channel 40.
  • By covering the end face 22 and the region 34 with the barrier medium 36 is an admission of these surface areas, for example due to meniscus formation between the end face and curtain edge at least reduces and accordingly prevents larger amounts of coating color are taken at these points of the fibrous web 12.
  • a mechanical barrier arrangement 50 is provided, which is formed by a circumferentially guided endless belt 52 which rests against the material web underside 28 with a strand running in the same direction and at the same speed as the material web 12.
  • the band 22 may extend over the full web width and preferably project laterally beyond the web on both sides.
  • two such bands 52 may be provided, each of which abuts only on a region near the edge of the underside 28 of the material web and protect this area against contamination with coating color.
  • the mechanical barrier arrangement 50 is combined with an upstream nozzle arrangement 26 for applying a barrier fluid to the edge end face 22 and optionally also to the surface area 34 close to the edge (see FIG. 2) of the fibrous web underside 28.
  • the barrier assembly 50 may be provided with a cleaning arrangement for cleaning the belt surface, for example with a scraper 54, the removes adhering coating residues in a discharge channel 56.
  • a cleaning nozzle assembly may be provided which washes scouring dye residue from the belt surface.
  • a barrier arrangement 50 with a continuous endless belt 52 is likewise provided.
  • the running direction of the belt is transverse to the running direction of the fibrous web 12, wherein the voltage applied to a region near the edge of the lower fibrous web side run of the band in the direction outwards, towards the material web edge or away from the web runs.
  • the curtain edge area divided off at the material web edge is pulled away from the end face 22 of the material web edge. Due to the viscosity of the coating color, this pulling away also affects the splitting of the curtain at the roadway edge, so that it is supported and the end face 22 is largely kept free of coating color.
  • the barrier arrangement 50 is structurally particularly simple.
  • the material web edge exporting barrier element 60 which protects the near-edge surface region of the bottom 28 of the web against contamination with coating color with a flat cover portion 62 and in a discharge channel 40 leading Abdenrabites 64 passes.
  • the curtain 18 falls with its edge region on this Abdenrabites 64.
  • the discharge section 64 may be executed with adjoining a Abriolitz walls 66, so that the discharge section 64 is designed trough-like.
  • the walls 66 can be equipped with a wall region which tapers in a tapering manner in the vertical direction onto the material web edge. This counteracts the formation of a strike color meniscus.
  • a coating color excess is formed on the upper side of the material web, which is also referred to below as a coating color superelevation 72.
  • the coating color excess can lead to problems in subsequent components, such as pollute them, for example, a downstream dryer.
  • a treatment arrangement arranged downstream of the curtain application head is provided in the manner of an "air knife” which directs through a nozzle arrangement 32 an air flow 32a with sufficient pressure against the coating color elevation 72 to blow off the coating color excess and transfer it into a discharge channel 41 , A portion of the blown coating color 72 will not reach the discharge chute 41, but remain on the uncoated edge region of the fibrous web 12. In that regard, the coating color excess is partly removed and partially distributed over the material web surface.
  • the treatment assembly comprises a treatment element 74 which presses on the coating color elevation 72 and, so to speak, calibrates it to a desired thickness.
  • the coating color overshoot is in particular pushed to the side, in the direction of the pulp edge, that is to say it is distributed over the previously uncoated edge region of the fibrous web 12.
  • Treatment element 74 is a pressing wheel or a pressure roller, which preferably rotate in synchronism with the run of the fibrous web provided. But it can also be a pressure belt used.
  • a support element for example a support roller 76 or a support wheel, is preferably provided on the other material web side.
  • the aftertreatment for the distribution of the coating color excess and, if appropriate, for the partial removal of the coating color excess can also be effected by means of a locally acting doctor element.
  • the peripheral surface of the treatment element 74, so the Andschreibrads, the pressure roller or the Andschreibbands, can be suitably wetted with a adhering the coating color reducing medium, such as water. Furthermore, a scraper arrangement and / or a washing-off arrangement can be provided to clean the circumferential surface of adhering coating color.
  • the curtain 18 has a main zone 80, two each one of the two fibrous web edges associated with edge zones 82 and the actual Curtain edge area 84 (see Fig. 9a).
  • the property of the curtain is varied over these zones so that the edge zone 82 has a characteristic facilitating the division of the curtain at the web edge.
  • the edge zone 82 has a reduced viscosity relative to the main zone 80 and the curtain edge region 84 due to a reduced solids concentration. This can be achieved, for example, according to FIG. 12 , in that, shortly before the curtain 14 exits a slot nozzle 90, a dilution medium, for example water, is locally supplied to a distribution chamber 92 of the coating head having the slot nozzle 90.
  • a dilution medium for example water
  • FIG. 12 schematically shows a feed channel 94, which supplies water into the chamber 92 locally over a certain width in the extension direction of the slot nozzle 90, so that the curtain has diluted coating color and thus a reduced solids concentration and consequently a reduced viscosity in the fall region below the channel 94 ,
  • the curtain in the edge zone 82 is less thick, which can be achieved, for example, by the use of a nozzle element 91 with a slot nozzle 90 corresponding to FIG. 11 .
  • the slit nozzle 90 of the nozzle member 91 has a portion 95 with a reduced slot width.
  • the nozzle member 91 could be located in the chamber bottom 96 of the coating head 16 instead of the distribution chamber 92 of FIG. The result is a curtain, as shown schematically in Figure 9c .
  • a local dilution of the coating color of the curtain 18 may also be made subsequently after the curtain exits the slot die , for example by spraying dilution fluid (eg, water, steam) onto the curtain by means of spray nozzles 100 as shown in Figure 9d.
  • dilution fluid eg, water, steam
  • a curtain zone corresponding curtain area is at least partially enclosed by walls 102 and the curtain is supplied in this enclosure via feed lines with steam or a spray to locally dilute the coating color.
  • a local heating of the coating color is achieved, which also leads to a local reduction in the viscosity of the coating color of the curtain leads and thus promotes the curtain pitch on the pulp edge.
  • the promotion of curtain separation by local reduction of curtain thickness in the edge zone is particularly expedient.
  • the thickness of the edge zone may be about 50 to 90% of the thickness of the main zone.
  • the edge zone 82 overlaps the fibrous web edge and the edge zone does not extend over the entire curtain edge.
  • the latter is advantageous to promote a clean fall of the curtain without constrictions.
  • an application of the proposals also comes in accordance with EP 1 598 115 A2 into consideration.
  • FIG. 10 shows an alternative embodiment in which the entire curtain edge region 84 is designed as edge zone with reduced viscosity or / and reduced thickness and the edge zone 82 does not overlap or overlaps only slightly with the material web 12. Otherwise, the statements on FIG. 9 also apply to FIG. 10.
  • An undesired or excessive occupancy of the edge end faces 22 and near-edge regions of the upper side 20 and the underside 28 of the fibrous web 12 can also be reliably removed by cutting off a respective edge strip 110 of the material web and discharging it separately from the remainder of the material web.
  • FIG. 13 shows a cutting arrangement 112 connected downstream of the coating head 16 represented here by a rotating cutting disc.
  • Other types of cutting blades or cutting blades may be provided.

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  • Application Of Or Painting With Fluid Materials (AREA)
  • Coating Apparatus (AREA)
EP06122788A 2005-12-22 2006-10-24 Procédé et appareil d'application d'un produit d'application sur une bande de materiau en movement Withdrawn EP1801289A1 (fr)

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DE200510062080 DE102005062080A1 (de) 2005-12-22 2005-12-22 Verfahren und Vorrichtung zum Auftragen eines Auftragsmediums auf eine Materialbahn

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EP1801289A1 true EP1801289A1 (fr) 2007-06-27

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EP2147724A1 (fr) * 2008-07-22 2010-01-27 Ricoh Company, Limited Procédé de revêtement de rideaux et appareil de revêtement de rideaux
CN101632973B (zh) * 2008-07-22 2013-03-27 株式会社理光 帘式涂布装置
AT521651A3 (de) * 2018-09-05 2020-08-15 Valmet Technologies Oy Verfahren zur behandlung einer faserbahn und behandlungssystem zur behandlung einer faserbahn
CN113199850A (zh) * 2020-01-30 2021-08-03 赛米控电子股份有限公司 将导热材料印刷到冷却装置或功率半导体模块上的设备

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DE102009026451B4 (de) 2008-05-30 2021-08-05 Nichiha Corp. Bauplatte und Verfahren zum Herstellen desselben
DE102009046095B4 (de) * 2009-10-28 2016-07-28 Valmet Technologies, Inc. Anordnung zur Kontrolle von den in der Florstreichvorrichtung mit der Bahn geführten Luftströmungen
AT516198A1 (de) * 2014-08-22 2016-03-15 Berndorf Band Gmbh Verfahren zur Herstellung eines Produktes aus einem Nanofasern enthaltenden Bioplastik

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US4407690A (en) * 1981-03-18 1983-10-04 Du Pont Canada Inc. Process for coating webs with polyethylene
US4479987A (en) * 1983-01-04 1984-10-30 Agfa-Gevaert Aktiengesellschaft Process and an apparatus for stabilizing free-falling liquid curtains
WO1990000939A1 (fr) * 1988-07-20 1990-02-08 Eastman Kodak Company Procede et appareil pour moduler les parties marginales d'un voile de couchage
EP0737521A2 (fr) * 1995-04-10 1996-10-16 Du Pont De Nemours (Deutschland) Gmbh Procédé et dispositif pour reduire les perturbations dans un rideau d'enduction
WO1999009253A2 (fr) * 1997-08-15 1999-02-25 Jagenberg Papiertechnik Gmbh Procede et dispositif permettant d'appliquer un enduit pigmente sur une bande de papier ou de carton
DE10012256A1 (de) * 2000-03-14 2001-09-20 Voith Paper Patent Gmbh Auftragsvorrichtung
EP1338344A2 (fr) * 2002-02-26 2003-08-27 Eastman Kodak Company Méthode et système de revêtement
DE10232949A1 (de) * 2002-07-19 2004-01-29 Voith Paper Patent Gmbh Vorhang-Auftragsvorrichtung

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US4135477A (en) * 1975-09-22 1979-01-23 Ciba-Geigy Ag Curtain coating apparatus
US4407690A (en) * 1981-03-18 1983-10-04 Du Pont Canada Inc. Process for coating webs with polyethylene
US4479987A (en) * 1983-01-04 1984-10-30 Agfa-Gevaert Aktiengesellschaft Process and an apparatus for stabilizing free-falling liquid curtains
WO1990000939A1 (fr) * 1988-07-20 1990-02-08 Eastman Kodak Company Procede et appareil pour moduler les parties marginales d'un voile de couchage
EP0737521A2 (fr) * 1995-04-10 1996-10-16 Du Pont De Nemours (Deutschland) Gmbh Procédé et dispositif pour reduire les perturbations dans un rideau d'enduction
WO1999009253A2 (fr) * 1997-08-15 1999-02-25 Jagenberg Papiertechnik Gmbh Procede et dispositif permettant d'appliquer un enduit pigmente sur une bande de papier ou de carton
DE10012256A1 (de) * 2000-03-14 2001-09-20 Voith Paper Patent Gmbh Auftragsvorrichtung
EP1338344A2 (fr) * 2002-02-26 2003-08-27 Eastman Kodak Company Méthode et système de revêtement
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Publication number Priority date Publication date Assignee Title
EP2147724A1 (fr) * 2008-07-22 2010-01-27 Ricoh Company, Limited Procédé de revêtement de rideaux et appareil de revêtement de rideaux
US20100021645A1 (en) * 2008-07-22 2010-01-28 Ricoh Company, Ltd. Curtain coating method and curtain coating apparatus
CN101632973B (zh) * 2008-07-22 2013-03-27 株式会社理光 帘式涂布装置
US8522713B2 (en) 2008-07-22 2013-09-03 Ricoh Company, Ltd. Curtain coating method and curtain coating apparatus
AT521651A3 (de) * 2018-09-05 2020-08-15 Valmet Technologies Oy Verfahren zur behandlung einer faserbahn und behandlungssystem zur behandlung einer faserbahn
AT521651B1 (de) * 2018-09-05 2021-02-15 Valmet Technologies Oy Verfahren zur behandlung einer faserbahn und behandlungssystem zur behandlung einer faserbahn
CN113199850A (zh) * 2020-01-30 2021-08-03 赛米控电子股份有限公司 将导热材料印刷到冷却装置或功率半导体模块上的设备

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