WO2000018514A1 - Procede et dispositif pour appliquer une substance liquide ou pateuse sur un substrat en mouvement - Google Patents

Procede et dispositif pour appliquer une substance liquide ou pateuse sur un substrat en mouvement Download PDF

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Publication number
WO2000018514A1
WO2000018514A1 PCT/EP1999/007241 EP9907241W WO0018514A1 WO 2000018514 A1 WO2000018514 A1 WO 2000018514A1 EP 9907241 W EP9907241 W EP 9907241W WO 0018514 A1 WO0018514 A1 WO 0018514A1
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WO
WIPO (PCT)
Prior art keywords
application
medium
application medium
nozzles
auxiliary
Prior art date
Application number
PCT/EP1999/007241
Other languages
German (de)
English (en)
Inventor
Bernhard Kohl
Benjamin Mendez-Gallon
Richard Bernert
Martin Kustermann
Rüdiger KURTZ
Hans-Dieter DÖRFINGER
Original Assignee
Voith Sulzer Papiertechnik 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
Priority claimed from DE1998144979 external-priority patent/DE19844979A1/de
Application filed by Voith Sulzer Papiertechnik Patent Gmbh filed Critical Voith Sulzer Papiertechnik Patent Gmbh
Publication of WO2000018514A1 publication Critical patent/WO2000018514A1/fr

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Classifications

    • 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
    • B05C17/00—Hand tools or apparatus using hand held tools, for applying liquids or other fluent materials to, for spreading applied liquids or other fluent materials on, or for partially removing applied liquids or other fluent materials from, surfaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B13/00—Machines or plants for applying liquids or other fluent materials to surfaces of objects or other work by spraying, not covered by groups B05B1/00 - B05B11/00
    • B05B13/02—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work
    • B05B13/0207—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work the work being an elongated body, e.g. wire or pipe
    • 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
    • D21H23/50—Spraying or projecting

Definitions

  • the present invention relates to a method for the direct or indirect application of a liquid or pasty application medium to a running surface according to the preamble of claim 1.
  • Such a method is usually used in the context of coating systems to coat a running surface, for example a material web, which is made of paper, cardboard or a textile material, on one or both sides with one or more layers of the application medium, for example color, starch, impregnation liquid or the like.
  • a running surface for example a material web, which is made of paper, cardboard or a textile material
  • the liquid or pasty application medium is applied directly to the surface of the running material web by an application device, which is carried during the application on a circumferential support surface, for example an endless belt or a counter roller.
  • the liquid or pasty application medium is first applied to a counter surface serving as a carrier surface, e.g. the surface of a counter roller equipped as an application roller, applied in order to be transferred from there in a roller gap through which the material web runs from the application roller to the material web.
  • a generic method according to the preamble of claim 1 is disclosed in the applicant's older DE 1 97 22 1 59 A1, which was published after the priority date of the present application.
  • the application medium is spaced apart from one another by means of a plurality of widthwise and / or longitudinal directions of the surface and / or individual application nozzles arranged one behind the other and clearly distanced from the surface, from which the application medium emerges in each case, applied to the surface in a large number of individual application areas.
  • adjacent individual application areas penetrate at least partially in their respective edge areas, so that an application medium layer is produced over essentially the entire width of the surface to be coated.
  • an ejection characteristic and / or a quantity of the ejected application medium can be varied by one or more of the plurality of individual application nozzles.
  • the coating medium layer is then usually leveled to achieve a uniform coat weight.
  • the resulting coat weight or basis weight is greater there than within the non-overlapping application area of an individual nozzle.
  • the present invention is therefore based on the technical problem of developing the method known from DE 1 97 22 1 59 A1 in such a way that the critical job orders described in connection with the previously described inaccuracies in terms of line or basis weight occurring parameters are avoided as far as possible.
  • the application medium is arranged by means of a plurality of individual application nozzles spaced apart from one another in the width direction and / or longitudinal direction of the surface and / or one behind the other and clearly distanced from the surface. from which the application medium emerges, applied to the surface in a large number of individual application areas. In this case, adjacent individual application areas penetrate at least partially in their respective edge areas, so that an application medium layer is produced over essentially the entire width of the surface to be coated.
  • an ejection characteristic and / or a quantity of the ejected application medium is varied by one or more of the plurality of individual application nozzles to produce a desired transverse and / or longitudinal profile of the application medium layer.
  • the surface coated with the application medium is then leveled.
  • the aforementioned variation of the ejection characteristic and / or the amount of the application medium ejected takes place locally differently with respect to the width direction and / or the longitudinal direction of the surface to be coated.
  • the ejection characteristic and / or the amount of the ejected application medium and thus also the application medium layer to be produced is deliberately influenced locally before the leveling.
  • the areal or spatial extent of this type of local manipulation naturally depends strongly on the uninfluenced standard output characteristic and standard output quantity of the individual Application nozzles and their arrangement relative to each other and thus also the size, shape and orientation of the penetration or overlap area of the resulting individual application areas.
  • single application nozzles with a narrow flat jet which primarily extends in the width direction, generally require a smaller local change in the ejection characteristic and / or the ejection quantity in relation to the longitudinal direction of the surface to be coated than, for example, single application nozzles with a conventional one Spray cones that will require appropriate variation in both the width and length directions.
  • single application nozzles with a conventional one Spray cones that will require appropriate variation in both the width and length directions.
  • the method according to the invention advantageously allows the line weight or basis weight differences in the overlapping edge regions of the individual application regions generated by means of the individual application nozzles to be significantly reduced.
  • This contributes significantly to the production of a high quality end product.
  • the invention can in principle also be used with regard to less critical types of application medium and order parameters and can also lead to a further improvement in the order result in these cases.
  • An advantageous embodiment feature of the method according to the invention provides that the locally different variation of the ejection characteristic takes place by deflecting the application medium emerging from the individual application nozzles.
  • Such a process step is expediently described in Connected with a suitable deflection device.
  • it is not absolutely necessary to generate a deflection at each individual application nozzle; For certain applications it may already be sufficient to carry out such manipulation only in connection with certain individual application nozzles.
  • a distraction can basically take place at one or more points in the spatial spray distribution of the emerging application medium.
  • the application medium is deflected by blowing on the application medium emerging from the individual application nozzles by means of a gaseous medium.
  • Air is preferably used as the gaseous medium, but other suitable gases or gas mixtures can also be used.
  • one or more blowing nozzles can be used, for example, from which the gaseous medium flows directed towards the emerging application medium or partial areas thereof.
  • the blowing nozzles can be designed to be adjustable and can be integrated into a control and / or regulating device.
  • the baffle plate is either stationary or preferably adjustable and / or movable in one or more axes formed and can have a flat, angled, curved in one or more planes curved or other suitable shape with respect to their longitudinal axis and the direction of ejection of a single application nozzle.
  • the baffle may be curved curved or fitted in other suitable form angled with respect to its transverse axis and the local cross-sectional shape of the ⁇ application medium jet produced by means of the single-application nozzle rectilinear. It is also possible to make the geometry of the deflection plate itself variable.
  • adjustable baffle plate in a control and / or regulating device.
  • specific areas of the application medium jet or even the entire jet can be deflected in a targeted manner, and the ejection characteristics can thus be influenced locally.
  • the locally different variation of the ejection characteristic can also take place by twisting and / or tilting predetermined individual application nozzles.
  • such an adjustment can in principle only be carried out only on certain selected individual application nozzles and also on all individual application nozzles.
  • the respective individual application nozzles combined to form an application unit can be rotated and / or tilted individually differently or in groups or in their entirety in the same direction.
  • a still further advantageous embodiment of the method according to the invention provides that the locally different variation of the ejection characteristic and / or the amount of the ejected order mediums by at least partially shutting off and / or covering one or more individual application nozzles.
  • This can be achieved, for example, with the aid of slide or cover elements corresponding to one or more individual application nozzles, which can have the same as well as different constructions and shapes.
  • slide or cover elements are also expediently part of a control and / or regulating device.
  • a shut-off and / or cover can be carried out both on individual nozzles and / or the nozzle jet generated by them and on several or even all nozzles.
  • the degree of shut-off and / or coverage can be the same for all or certain nozzles or differ from nozzle to nozzle.
  • the spray form of the individual application nozzles and consequently also the local application quantity are effectively influenced and thus, in a particularly simple and effective manner, the most uniform possible distribution of the application medium on the achieved surface to be coated.
  • a further preferred embodiment of the method according to the invention finally provides that the locally different variation of the ejection characteristics and / or the amount of the application medium ejected by at least temporarily adding a diluent to the application medium to be ejected by means of the individual application nozzles and / or exiting from the individual application nozzles he follows.
  • the admixture can thus take place before the application medium enters an individual application nozzle and / or within the individual application nozzle and / or within the actual nozzle jet or partial areas thereof.
  • a suitable separate or integrated admixing device is to be provided, which, if it is adjustable, can expediently be connected to a suitable control and / or regulating device.
  • an admixture into the nozzle jet can be provided, for example, or the single application nozzle can be equipped with separate spray openings for the application medium and the diluent.
  • the spray devices can have the same or different spray properties.
  • Water is preferably used as the diluent.
  • suitable diluents are of course also conceivable.
  • An admixture can take place both in connection with individual and several individual application nozzles, the admixture quantity being able to be the same or different in each case.
  • the method according to the invention is used in the context of a device which, in the present case, is designed as a device for the direct application of a liquid or pasty application medium to a running material web.
  • the device comprises a counter or support roller over which the material web runs. Furthermore, the device has a support beam opposite the support roller, on which an application device is held.
  • the application device is equipped with a distribution tube which feeds the application medium and to which a large number of individual application nozzles are provided which are spaced apart from one another with respect to the width direction of the material web and which here extend in a straight row evenly distributed across the entire width of the material web. The respective individual application nozzles are distanced from the surface of the material web to be coated.
  • each of the single application nozzles is via a control and / or regulating device individually controllable, so that the radiation characteristics of the individual application nozzles and / or the amount of the emitted application medium can be manipulated to preset a desired transverse and / or longitudinal profile of the application medium layer.
  • the application device is followed by a leveling device in the form of a doctor device.
  • the application medium emerges from the respective individual application nozzles in the form of a free jet which widens in the shape of a cone or wedge and runs through the ambient atmosphere, is sprayed onto the material web and forms an individual application area associated with the respective nozzle.
  • the adjacent free jets penetrate or overlap in part, and thus also the individual application areas generated, in their respective edge areas.
  • the ejection characteristic and / or the quantity of the application medium ejected from one or more of the plurality of individual application nozzles is varied to produce a desired transverse and / or longitudinal profile of the application medium layer.
  • the application medium is applied in excess in the present case.
  • the job generated is then equalized by means of the doctor device and the final longitudinal and / or transverse profile is thus set.
  • an application medium layer of essentially the same layer thickness is produced over the entire width of the running material web during the general spraying process explained above.
  • the subsequent leveling makes it easy to achieve a uniform coat or surface weight.
  • the small differences in layer thickness that occur in the overlap zones of the individual application areas generated by spraying and the associated coat weight or Differences in basis weight can no longer be compensated by the subsequent leveling alone.
  • the expulsion characteristic and / or the amount is performed in the latter cases the ejected order ⁇ medium relative to the width direction and / or the longitudinal direction of the surface to be coated locally.
  • the application medium layer to be produced is therefore influenced locally before the leveling in order to reduce the coating weight or basis weight differences between overlapping and non-overlapping zones of the individual application areas to such an extent that they can be easily compensated for by the leveling process and an overall uniform coating result can be achieved is.
  • the locally different variation of the ejection characteristics of the individual application nozzles takes place in that the application medium emerging from the individual application nozzles is deflected by blowing with a gaseous medium and so the original ejection properties of the nozzle is changed locally.
  • the gaseous medium is air which flows out from air-blowing nozzles which act as deflection devices.
  • the air blowing nozzles are from one or more sides onto the spray cone of a respective one Single application nozzle directed.
  • the blowing nozzles are designed to be adjustable, so that, if necessary, both the blowing direction and the flow velocity and / or the flow distribution of the outflowing air can be influenced.
  • the blowing nozzles are also integrated in a control and / or regulating device, which detects that from the sensors. Individual application nozzles generated transverse and / or longitudinal profile recorded before leveling and the blowing nozzles adjusted accordingly depending on the determined profile values.
  • the locally different variation of the ejection characteristics of the individual application nozzles takes place by means of essentially flat baffle plates which can be moved in one or more axes with the aid of actuators.
  • One or more baffle plates are provided for each individual application nozzle, which are arranged below the relevant nozzles in or on the emerging nozzle jet.
  • the movable deflecting plates are also integrated in a control and / or regulating device in a corresponding manner.
  • the locally different variation of the discharge characteristic is carried out by rotating and / or tilting the individual application nozzles.
  • the rotary and / or tilting movement is made possible by actuators corresponding to the individual application nozzles concerned.
  • the rotatable and / or tiltable individual application nozzles and their actuators are integrated in a control and / or regulating device which, by means of sensors, also supports the transverse and / or longitudinal profile generated by the individual application nozzles recorded before leveling and regulates the rotation and / or tilting movement of the individual application nozzles as a function of the determined profile values.
  • the locally different variation of the ejection characteristic __ and / or the amount of the ejected application medium takes place by at least partially shutting off and / or covering one or more individual application nozzles.
  • a movable slide or cover element is provided in front of the nozzle outlet and / or in the area of the nozzle jet of a single application nozzle in question, which element can be actuated by means of an actuator.
  • the slide or cover elements are integrated with their actuators in a control and / or regulating device analogous to the previously described exemplary embodiments, which detects the transverse and / or longitudinal profile generated by the individual application nozzles before the leveling and depending on the determined profile values actuated or readjusted the slide or cover elements accordingly.
  • the degree of shut-off and / or coverage is either the same or different depending on the respective application parameters and the measured values of the sensors for all or only certain of the individual application nozzles equipped with the slide or cover elements. In this way, the shape of the application medium jet ejected from the nozzles as well as the spray pattern and consequently also the local application quantity and the associated weight per unit area or coat weight are influenced locally before the leveling.
  • the locally different variation of the ejection characteristic and / or the amount of application medium ejected is achieved by at least temporarily adding a diluent, in the present example water, into the application medium to be ejected by means of the individual application nozzles.
  • a diluent in the present example water
  • certain individual application nozzles in a row of nozzles are equipped with an adjustable admixing device which is in turn connected to a control and / or regulating device analogous to the previously described embodiment variants.
  • the degree of admixture of water is set or regulated accordingly in the nozzles concerned and thus the area or coating weight of the resulting application medium layer and its physical properties are influenced locally in a targeted manner.
  • the overall leveling result is then achieved by the subsequent leveling process.
  • the locally different variation of the ejection characteristic takes place by at least temporarily thermally influencing the application medium to be ejected by means of the individual application nozzles and / or emerging from the individual application nozzles and / or pre-metered onto the running surface.
  • thermal influence can be achieved in particular by heating the individual application nozzles and thus also the application medium to be ejected.
  • the thermal influence can also be carried out by means of hot air or steam, in particular water vapor; in such a case, one or more individual application nozzles can be designed, for example, as two-substance nozzles, ie for hot air / steam and for the application medium.
  • the thermal influence of the pre-metered application layer reference is made to the content of the applicant's older application, which is published after the priority date of the present application, DE 198 00 954 A1.
  • the so-called film splitting can be avoided particularly effectively.
  • the medium applied to the running surface dries more slowly and its viscoelasticity is reduced.
  • the application medium flows better and application thickness differences and irregularities in the surface structure of the application layer become more easily balanced, so that under certain conditions it is even possible to dispense with subsequent leveling by means of a leveling or doctor device.
  • the moisture introduced into the application layer by steam, in particular water vapor can be removed again by means of a downstream drying device without. the composition of the application layer is impaired.
  • nozzle jets of adjacent individual application nozzles are emitted with an offset to one another.
  • a distance between the jet streams is ensured and mutual jet jet contact and / or jet jet interference is avoided.
  • the at least partial overlap of the individual application areas which can become extremely small with a suitable nozzle setting, results from the progressive movement of the running surface.
  • This method variant has proven particularly useful when using flat jet nozzles which produce a relatively broad, narrow flat jet (free jet) with a sharply defined spray pattern.
  • the offset of the jet streams of adjacent individual application nozzles can be achieved, for example, by blasting the jet streams offset in the longitudinal direction of the surface to be coated.
  • adjacent individual application nozzles (or also nozzle groups) can be arranged offset from one another by a predetermined distance in the longitudinal direction of the surface to be coated on a support bar and / or a distribution pipe for the application medium or the like.
  • the nozzles can have different lengths relative to a reference plane formed and / or be individually adjustable in their distance from their attachment point and / or to the surface to be coated in order to achieve the desired offset.
  • the offset of the individual application nozzles is preferably in a range from 5 to 25 mm. Depending on the radiation characteristics and the mutual distance between the nozzles, this value range can, however, deviate considerably.
  • the offset of the nozzle jets of adjacent individual application nozzles can moreover be achieved by an oblique jet of the nozzle jets in relation to the width direction of the surface to be coated.
  • This variant is particularly suitable for applications in which flat jet nozzles used as individual application nozzles are arranged on a common axis which is essentially parallel to the width direction of the surface to be coated.
  • the nozzle jets would normally touch each other at an appropriate lateral distance.
  • a distance can be generated between the nozzle jets and mutual jet jet contact and / or nozzle jet interference can be avoided.
  • the nozzle jets are thereby emitted obliquely with respect to the width direction of the surface to be coated with a predetermined rectified (but not necessarily the same for each nozzle) angle.
  • This effect can of course also be achieved by adjusting the nozzle geometry and / or the radiation characteristic accordingly.
  • the oblique radiation angle is preferably in a range from 5 to 15 degrees. Depending on the radiation characteristics and the mutual spacing of the nozzles, this range of values can, however, deviate considerably.
  • the invention is not restricted to the above exemplary embodiment, which only serves to explain the basic concept of the invention in general. Rather, within the scope of protection, the method according to the invention can also take other forms than those described above.
  • the device elements to be used in connection with the method steps according to the invention do not necessarily have to be provided for each individual application nozzle. For certain applications, it is sufficient to equip only a few selected individual application nozzles, individual application areas or their subsections with these elements. For example, it is conceivable to equip only every second individual application nozzle in a row of nozzles, or to provide a specific distribution pattern of these device elements in the case of a plurality of rows of nozzles arranged one behind the other.
  • the invention relates to a method for applying a liquid or pasty application medium to a running surface, the running surface being the surface of a running material web, in particular made of paper, cardboard or textile material, when applied directly, or the surface being applied indirectly of a transfer element, for example a transfer roller, which then transfers the application medium to the material web, and wherein the application medium is delivered to the substrate as a flat jet by means of at least one flat jet nozzle.
  • This object is achieved according to the invention by a method of the aforementioned type, in which the application medium in the area of the formation of the flat jet is influenced by means of at least one auxiliary medium.
  • this auxiliary medium With the help of this auxiliary medium, the accumulation of application medium in the side end regions S or in the central region M of the flat jet can be counteracted or such accumulation can even be avoided completely, so that the desired ejection characteristic is obtained which is uniformly thick over the entire jet width.
  • the distribution of the application medium over the beam width can be influenced both by the supply of auxiliary substances and by the action of auxiliary radiation as auxiliary media.
  • Suitable auxiliaries are, for example, gases or liquids which are preferably supplied to the application medium under pressure. Because of the simple availability and the low costs associated with their use, air or / and steam, preferably water vapor, can advantageously be used as gases. For example, water and / or application medium can be considered as liquids.
  • the application medium can also be influenced by any type of radiation which is in the Is able to exert a force on the application medium.
  • the application medium can be influenced by ultrasound, preferably high-frequency ultrasound.
  • the auxiliary medium can be supplied to the application medium with a characteristic which is suitable with regard to the desired uniformity of the ejection characteristics, for example round or flat or - particularly shaped.
  • the feed direction of the application medium and the feed direction of the auxiliary medium can enclose an angle of between approximately 20 ° and approximately 130 °.
  • the application medium can be influenced particularly effectively by means of the auxiliary medium if the application medium is supplied as a primary jet with an essentially circular cross section and is directed against a surface which is inclined relative to the feed direction of the primary jet to form the flat jet. If this flat jet formation surface is curved transversely to the feed direction of the application medium, the jet can hereby be fanned particularly broadly.
  • the formation of an essentially uniform ejection characteristic over the jet width can be supported in that the feed direction of the primary jet includes an angle of between approximately 5 ° and approximately 25 ° with a straight line extending in the flat beam formation area.
  • the application medium jet acts on the application medium from the side facing away from the flat jet formation area, the application medium jet is guided or shaped between the flat jet formation area and the uniform compressed air jet, which enables a particularly effective influence on the ejection characteristics of the flat jet nozzle.
  • a compressed gas for example compressed air, which is supplied to the application medium jet with a jet characteristic that is substantially uniform over its jet width.
  • the supply of the auxiliary medium has proven to be particularly effective at a position which is arranged in the feed direction of the application medium at most 10 mm after the start of the flat jet formation area.
  • this position is arranged in the immediate vicinity of the nozzle outlet, i.e. at a distance of at most 1 5 mm to the nozzle outlet.
  • a uniform application profile over the entire working width of the material web can be achieved when using flat jet nozzles according to the invention if the application device comprises a plurality of application nozzles distributed over the working width.
  • the application device comprises a plurality of application nozzles distributed over the working width.
  • the invention further relates to a device for applying a liquid or pasty application medium to a running surface, the running surface being the surface of a running material web, in particular made of paper, cardboard or textile material, when it is applied directly, or, in the case of indirect application Surface of a transfer element, for example a transfer roller, which then transfers the application medium to the material web, and wherein the application device comprises at least one application nozzle which emits the application medium as a flat jet to the substrate.
  • Figure 1 is a sectional side view of a flat fan nozzle according to the invention.
  • FIG. 2 shows a further sectional view of the flat jet nozzle according to the invention along the line II-II in FIG. 1;
  • Fig. 3 is a schematic representation of various discharge characteristics to explain the problem underlying this aspect of the invention.
  • a flat jet nozzle according to the invention is generally designated 10. It comprises a base part 12, in which a feed channel 14 for application medium 16 extends between an inlet end 14a and a beam shaping chamber 18.
  • the feed channel 14 has an essentially circular cross section (see FIG. 2) and tapers on a section 14b toward the beam shaping chamber 18.
  • the application medium 1 6 strikes a beam formation surface 20 which is inclined with respect to the application medium feed direction Z.
  • a straight line G extending in the area 20 essentially in extension to the feed direction Z includes an angle y with this feed direction Z, the value of which preferably is between about 5 ° and about 25 °.
  • the jet-forming surface 20 also extends in a trough-like manner in the transverse direction Q with respect to the applied application medium 16 in order to ensure a broad fanning out of the application medium jet.
  • the jet formation surface 20 is also extended along an extension 1 2a of the base part 1 2, which extends over the exit-side end 1 8b of the jet shaping chamber 1 8 extends.
  • the flat jet nozzle 10 has a further feed channel 22 for feeding an auxiliary substance 21 on the side of the jet shaping chamber 16 opposite the jet formation surface 20.
  • the auxiliary 21 can be, for example, a compressed gas, such as compressed air or water vapor supplied under pressure, or a liquid, for example water or application medium.
  • the auxiliary material feed channel 22 runs in an auxiliary material supply direction X, which includes an angle ⁇ with the application medium supply direction Z, the value of which is between approximately 20 ° and approximately 130 °, in the exemplary embodiment shown approximately 90 °.
  • the auxiliary material supply channel 22 narrows in its section 22b adjacent to the chamber 18 in the application medium supply direction Z, while the same section 22b according to FIG 2 widens in the transverse direction Q.
  • the auxiliary substance 21 thus emerges from the auxiliary substance feed channel 22 as a flat jet, which presses the application medium 16 in the beam shaping chamber 18 evenly against the beam formation surface 20 over the entire beam width.
  • the formation of the beam character strategy in the region of the beam shaping chamber 18 or the beam formation surface 20 can also be influenced by means of a suitable type of radiation, for example by means of ultrasound.
  • the flat jet nozzle 10 comprises an ultrasound source 24, the sound pressure of which acts on the application medium 16 in the region of the beam shaping chamber 18, again from the side opposite the beam formation surface 20.
  • the distance d1 between the central axis X of the auxiliary material supply channel 22 and the beginning of the beam shaping chamber 1 8 should be at most 1 0 mm, and that in an analogous manner the distance d2 between this axis X and the end 1 8b of the beam shaping chamber 1 8 should not exceed 1 5 mm.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Abstract

L'invention concerne un procédé permettant d'appliquer directement ou indirectement une substance liquide ou pâteuse sur une surface en mouvement. La dite substance est appliquée à l'aide d'une pluralité de buses d'application individuelles (10), disposées à distance les unes des autres dans le sens de la largeur et/ou de la longueur de la surface, les unes à côté des autres ou les unes derrière les autres, et à nette distance de la surface. La substance sort desdites buses d'application et est appliquée sur la surface, dans une pluralité de zones d'application individuelles. Dans chaque cas, des zones d'application individuelles adjacentes s'interpénètrent au moins en partie dans leurs zones marginales respectives, de manière à produire une couche de substance d'application sur sensiblement l'ensemble de la largeur de la surface à recouvrir. Une caractéristique d'éjection et/ou une quantité de la substance d'application éjectée d'une ou de plusieurs des buses d'application individuelles (10) sont modulées pour produire un profil transversal et/ou longitudinal voulu de la couche de substance d'application. La surface recouverte par la substance d'application est égalisée. La modulation de la caractéristique d'éjection et/ou de la quantité de substance d'application éjectée s'effectue localement de manière différenciée, en fonction du sens de la largeur et/ou du sens de la longueur de la surface à recouvrir.
PCT/EP1999/007241 1998-09-30 1999-09-30 Procede et dispositif pour appliquer une substance liquide ou pateuse sur un substrat en mouvement WO2000018514A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19844979.8 1998-09-30
DE1998144979 DE19844979A1 (de) 1997-05-27 1998-09-30 Verfahren zum direkten oder indirekten Auftragen eines flüssigen oder pastösen Auftragmediums auf eine laufende Oberfläche

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Publication Number Publication Date
WO2000018514A1 true WO2000018514A1 (fr) 2000-04-06

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004028701A1 (fr) * 2002-09-26 2004-04-08 Metso Paper, Inc. Buse
WO2005087387A3 (fr) * 2004-03-16 2005-10-27 Nuetro Maschinen & Anlagen Procédé de mise en peinture au moyen de vapeur d'eau
EP2684611A2 (fr) * 2012-07-13 2014-01-15 Alstom Technology Ltd Agencement de lance de pulvérisation

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FR2652763A1 (fr) * 1989-10-10 1991-04-12 Auge Gerard Buse a deflecteur concave pour projection de liquide.
EP0881330A2 (fr) * 1997-05-27 1998-12-02 Voith Sulzer Papiermaschinen Gesellschaft mbH Procédé et dispositif pour enduire un matériau fluide ou pâteux sur une bande en mouvement
DE19800954A1 (de) 1998-01-13 1999-07-15 Voith Sulzer Papiertech Patent Vorrichtung zum direkten oder indirekten Auftragen eines flüssigen oder pastösen Auftragsmediums auf eine laufende Materialbahn, insbesondere aus Papier oder Karton

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US2530671A (en) * 1945-03-08 1950-11-21 Spraying Systems Co Flat spray nozzle
US2672844A (en) * 1951-06-21 1954-03-23 Vapo Systems Company Apparatus for treating flexible webs
US2960061A (en) * 1957-01-22 1960-11-15 Pennsalt Chemicals Corp Apparatus for applying a coating of controlled variable thickness to metal stock
US3625743A (en) * 1967-12-12 1971-12-07 Tamotsu Watanabe Method for impregnating running paper with moisture
US4687141A (en) * 1983-07-26 1987-08-18 Voest-Alpine International Corporation Jet nozzle
FR2652763A1 (fr) * 1989-10-10 1991-04-12 Auge Gerard Buse a deflecteur concave pour projection de liquide.
EP0881330A2 (fr) * 1997-05-27 1998-12-02 Voith Sulzer Papiermaschinen Gesellschaft mbH Procédé et dispositif pour enduire un matériau fluide ou pâteux sur une bande en mouvement
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DE19800954A1 (de) 1998-01-13 1999-07-15 Voith Sulzer Papiertech Patent Vorrichtung zum direkten oder indirekten Auftragen eines flüssigen oder pastösen Auftragsmediums auf eine laufende Materialbahn, insbesondere aus Papier oder Karton

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004028701A1 (fr) * 2002-09-26 2004-04-08 Metso Paper, Inc. Buse
US7608149B2 (en) 2002-09-26 2009-10-27 Metso Paper, Inc. Nozzle
WO2005087387A3 (fr) * 2004-03-16 2005-10-27 Nuetro Maschinen & Anlagen Procédé de mise en peinture au moyen de vapeur d'eau
EP1727623A2 (fr) 2004-03-16 2006-12-06 Nütro Maschinen- und Anlagenbau GmbH & Co. KG Procede de mise en peinture au moyen de vapeur d'eau
EP2684611A2 (fr) * 2012-07-13 2014-01-15 Alstom Technology Ltd Agencement de lance de pulvérisation
EP2684611A3 (fr) * 2012-07-13 2015-01-28 Alstom Technology Ltd Agencement de lance de pulvérisation
US9457366B2 (en) 2012-07-13 2016-10-04 General Electric Technology Gmbh Spray lance arrangement

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