EP0881330B1 - Procédé et dispositif pour enduire un matériau fluide ou pâteux sur une bande en mouvement - Google Patents

Procédé et dispositif pour enduire un matériau fluide ou pâteux sur une bande en mouvement Download PDF

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Publication number
EP0881330B1
EP0881330B1 EP98109532A EP98109532A EP0881330B1 EP 0881330 B1 EP0881330 B1 EP 0881330B1 EP 98109532 A EP98109532 A EP 98109532A EP 98109532 A EP98109532 A EP 98109532A EP 0881330 B1 EP0881330 B1 EP 0881330B1
Authority
EP
European Patent Office
Prior art keywords
jet
nozzle
nozzles
application medium
individual free
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.)
Expired - Lifetime
Application number
EP98109532A
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German (de)
English (en)
Other versions
EP0881330A2 (fr
EP0881330A3 (fr
Inventor
Richard Bernert
Rüdiger Dr. Kurtz
Hans-Dieter Dörflinger
Benjamin Mendez-Gallon
Martin Dr. Kustermann
Bernhard Kohl
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 Paper 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 Paper Patent GmbH filed Critical Voith Paper Patent GmbH
Publication of EP0881330A2 publication Critical patent/EP0881330A2/fr
Publication of EP0881330A3 publication Critical patent/EP0881330A3/fr
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Publication of EP0881330B1 publication Critical patent/EP0881330B1/fr
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B14/00—Arrangements for collecting, re-using or eliminating excess spraying material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/26—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means with means for mechanically breaking-up or deflecting the jet after discharge, e.g. with fixed deflectors; Breaking-up the discharged liquid or other fluent material by impinging jets
    • B05B1/262—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means with means for mechanically breaking-up or deflecting the jet after discharge, e.g. with fixed deflectors; Breaking-up the discharged liquid or other fluent material by impinging jets with fixed deflectors
    • B05B1/267—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means with means for mechanically breaking-up or deflecting the jet after discharge, e.g. with fixed deflectors; Breaking-up the discharged liquid or other fluent material by impinging jets with fixed deflectors the liquid or other fluent material being deflected in determined directions
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B5/00—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
    • B05B5/08—Plant for applying liquids or other fluent materials to objects
    • B05B5/14—Plant for applying liquids or other fluent materials to objects specially adapted for coating continuously moving elongated bodies, e.g. wires, strips, pipes
    • 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
    • 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
    • B05C11/02—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface ; Controlling means therefor; Control of the thickness of a coating by spreading or distributing liquids or other fluent materials already applied to the coated surface
    • B05C11/023—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface
    • B05C11/025—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface with an essentially cylindrical body, e.g. roll or rod
    • 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
    • D21H19/00—Coated paper; Coating material
    • D21H19/66—Coatings characterised by a special visual effect, e.g. patterned, textured

Definitions

  • the present invention relates to a method and a Device including the use of a large number of individual free jet nozzles for direct or indirect one or Apply liquid or pasty on both sides Application medium on a running surface.
  • DE 195 04 652 A1 describes one method and one Known device that serves a single, trace of a liquid or pasty medium as narrow as possible, preferably glue, on a running web of material apply.
  • the device has one Nozzle head with a single nozzle from which the medium directly and contactless on a narrow section of the Material web is sprayed on.
  • WO-A-97/13035 discloses an apparatus and a Process for applying a liquid application medium a running surface, the application medium using a variety of in the width direction of the surface spaced apart from one another and / or one behind the other arranged and clearly distanced from the surface Spray nozzles from which the application medium is atomized or emerges nebulously in a large number of individual order areas is applied to the surface.
  • EP-A-0 373 276 describes an application method and an application method Application device in which a powder or a Granules sprinkled or sprinkled on a surface becomes.
  • DE-A-16 11 787 discloses an apparatus and a Method in which, similar to that in WO-A-97/13035 Application medium using spray nozzles, from which the Application medium finely atomized or atomized emerges a surface is applied.
  • DE-A-20 54 752 discloses a similar application method and a similar applicator, in which either a): a dry, granular glue Application medium by means of a compressed air dusting nozzle a surface is sprinkled; or b): a liquid Application medium by means of an atomizing nozzle from which the Application medium emerges atomized or nebulized, is sprayed on.
  • DE-A-15 46 280 describes an apparatus and a method known in the / similar to the previously cited State of the art the application medium by means of spray nozzles where the application medium is atomized or nebulized emerges, is applied to a surface.
  • EP-A-0 421 262 discloses a cleaning method and one Cleaning device in which a person to be treated Subject to cleaning, i.e. a rinse or one Undergoes chemical treatment. Treating takes place by means of a treatment liquid which is for the Treatment process in the form of a so-called Gush current is brought.
  • the Device a manifold that extends across the width of the Surface of the object to be treated extends and with a variety of holes, i.e. Orifices, is provided.
  • the treatment liquid escapes during operation out of the holes and flows, i.e. more precisely flows along the baffle to the surface to be treated. During this flow, the surface flattens the partial streams spread apart and unite the said surge current. This device and this Processes do not fall within the technical field of Papermaking or paper finishing.
  • DE-A-42 05 313 discloses an application device and a Application process in which a liquid or pasty Medium using a single conventional nozzle in the kind of a slot nozzle, which is in the form of a narrow, long gap over essentially the entire width of the web a running surface to be coated extends on the surface is applied.
  • the nozzle is replaced by a Metering bar that is directly on the surface to be coated is applied, and by an overflow bar that is only one leaves a small gap to the surface, limits or educated.
  • the present invention is based on the object innovative, simple and effective process for im essential full-surface direct or indirect one or Apply liquid or pasty on both sides To create application medium on a running surface. Another object is to find a suitable device for To provide implementation of this procedure.
  • the first-mentioned problem is solved by a Method according to the invention with the features of claim 1.
  • a Method according to the invention for direct or indirect one or Apply liquid or pasty on both sides Application medium on a running surface, especially from paper or cardboard Application medium using a variety of widthwise and / or longitudinal direction of the surface spaced apart arranged side by side and / or one behind the other and Individual free jet nozzles distant from the surface, from which the application medium emerges in a closed curtain running through the ambient atmosphere, in a variety of individual order areas on the Surface applied, with each adjacent Single order areas in their respective border areas penetrate at least partially, so that a Application medium layer over essentially the entire width the surface to be coated is generated.
  • the running surface can be in the sense of Invention both for a web of material, in particular Paper or cardboard, trade (e.g. with direct order) or but also around the surface of an application roller (e.g. at the indirect method) or another type of circulating Support or support surface.
  • the order medium is contactless from the respective individual application nozzles onto the running surface applied, i.e. between the nozzles and there is no direct contact with the surface.
  • the single ones Application nozzles form one in the method according to the invention Row of nozzles that are essentially in the width direction of the current surface or extends obliquely to it.
  • the Nozzles can be evenly or in a row arranged unevenly and in relation to the longitudinal direction the running surface may also be offset from one another.
  • the single free jet nozzles can furthermore in a specific arrangement pattern via im essentially the entire width of the to be coated running surface be distributed, including apparent Overlaps of individual sections of the series possible are.
  • the entire, essential full coverage order from one Large number of small individual order areas that primarily from the discharge geometry and Ejection characteristics of the individual free jet nozzles result.
  • Nozzle types into consideration which a free jet, i.e. one through the Ambient atmosphere "closed curtain" of the generate ejected order medium.
  • the penetration of the respective border areas adjacent Individual application areas of the coated surface can either done by the fact that of two neighboring single jet nozzles in a single Job medium ejected before or during of application to the surface, i.e. to the Example by overlapping the rays of these nozzles, or in that individual order areas only overlap in successive work steps to Example by two in a row and "on gap" arranged rows of nozzles.
  • the method according to the invention is particularly constructive simple and inexpensive means feasible and permitted manufacturing in a simple and effective manner a uniform and high quality full surface Order for both direct and indirect Order operation. Since the entire order, as previously explained, from a variety of small, by means of the single free jet nozzles formed individual order areas can be put together, if necessary, in one common process step both a longitudinal profile as well a cross profile of the order created or to be generated adjusted, manipulated or at least to a high degree be pre-regulated. Because the single free jet nozzles are also individually controllable, can be the method according to the invention is particularly simple effective control and / or regulation concept realize.
  • the application medium is preferably essentially without Excess applied to the surface, whereby only so much application medium from the individual free jet nozzles is ejected as for the structure of the given Layer thickness is required.
  • the application medium according to another possible embodiment of the invention in excess to be applied the amount of application medium preferably corresponds to 2 to 5 times the final order to be achieved.
  • the invention is not exclusively based on the previous ones specified quantities fixed. If necessary, you can Values can be exceeded or fallen short of. Further is each optionally provided, that applied in excess Application medium by means of at least one doctor element to scrape off and into an order medium cycle due. As already briefly indicated above, is it in the context of the present invention at least another embodiment also provide that on the application medium applied to the running surface to equalize at least one leveling device.
  • Squeegee elements such as squeegee blades, squeegee bars, or squeegees the like for use. Unless a doctor bar, in particular a smooth doctor rod is used, it is advisable if it has the largest possible diameter. On such doctor blade element needed for effective Doctoring, leveling and setting a certain one Stroke weight or a certain stroke thickness correspondingly high dynamic pressure to "float", the through the kinetic energy and the momentum of the previously means of the individual free jet nozzles on an application roller (at indirect order) applied line film of liquid or pasty application medium must be generated.
  • the smooth doctor blade can basically also be doctor blades with a grooved or rough surface.
  • the diameter of the doctor rod should be if possible be at least 14 mm, but preferably approx. 35 mm. However, the invention is not to these dimensions limited. Depending on the application, the values mentioned can may well be exceeded or fallen short of.
  • This device for direct or indirect one- or two-sided application of a liquid or pasty application medium on a running surface comprises a support or support surface for the running surface and a variety of related to the width direction and / or Spaced longitudinally of the surface from each other single free jet nozzles arranged side by side and / or one behind the other, from which the application medium emerges in a closed curtain running through the ambient atmosphere, and which are clearly distanced from the support or support surface and thus from the surface carried by the support or support surface (6).
  • the device according to the invention also offers the already in Explained in connection with the inventive method Benefits.
  • the device according to the invention constructively particularly simple and inexpensive realize, has a very robust structure and allows because of their simpler construction, it is also easier Handling and maintenance.
  • Fig. 1 is a schematic lateral Sectional view of a first embodiment of a Device according to the invention shown, the present Case as a device for direct application of a liquid or pasty application medium 2 to a running Material web 4 is designed.
  • the device comprises a Counter or support roller 6, over which the material web 4 runs.
  • the direction of rotation of the support roller 6 and thus the running direction the material web 4 is indicated by an arrow.
  • Of the device further has one of the support roller 6 opposite support beam 8 on which one Application device A is held.
  • the order facility A is with a distribution pipe 10 feeding the application medium 2 equipped to which a variety of related to the Width direction (see reference numeral B in Fig.
  • Material web 4 spaced apart from each other arranged individual free-jet nozzles 12 are provided, which are here in a straight row evenly distributed across extend the entire web width.
  • the one with the Single free jet nozzles 12 communicating distribution pipe 10 is provided with a non-stick coating 24 or at least partially with a material Non-stick properties, for example PTFE (Teflon) or CFRP (Carbon fiber plastic). So that can Single free jet nozzles 12 supplied application medium 2 does not adhere to the distribution pipe 10 and there are no special ones Cleaning measures necessary, which is particularly the case with a Conversion to another order medium type is an advantage is.
  • the respective individual free jet nozzles 12 clearly from the surface of the support roller 6 or coating material web 4 distanced.
  • the distance D the Single free jet nozzles 12 to the surface of the material web 4 adjustable in the present example. This happens through a corresponding manual and / or automatic, possibly caused by a combined movement, Height adjustment of the support beam 8 that the distribution pipe 10th and carries the nozzles 12. This adjustment movement is through a double arrow 26 indicated.
  • the support beam 8 can in principle, however, also other suitable and to this Purpose-designed device components for Example a modified manifold 10 to be moved.
  • In 1 is the exit angle with the reference symbol ⁇ one from a respective single free jet nozzle 12 emerging jet 18 marked.
  • the application device A is based on the direction of rotation the support roller 6 a squeegee and leveling device 14 downstream. Serves as said device 14 in this Example of a smooth roll doctor bar with a large one Diameter of approx. 35 mm.
  • the distribution pipe 10 and the between the application device A and the doctor device 14 located area of the device are covered and Collector plates 16 clad.
  • FIG. 1 is the individual free jet nozzles 12 based on the direction of travel the material web 4 one in the form of a scraper configured air boundary layer removal device 28 connected upstream from the current surface 4 entrained air boundary layer 30 immediately before actual job location removed and thus to a Optimization of the order result contributes.
  • a scraper can also suitable suction or Blow-out device find application.
  • FIG. 2 is a schematic frontal view of the Arrangement of the individual free jet nozzles 12 based on the Width direction B of the material web 4 and the Ejection characteristic, i.e. here the radiation pattern the nozzles 12 to remove.
  • the application medium emerges from the individual free jet nozzles in the form of a wedge-shaped or fan-shaped expanding and running through the surrounding atmosphere Jet or free jet 18, is on the Material web 4 blasted and forms one of the respective ones Nozzle associated single application area.
  • blasting penetrate (U) or overlap each adjacent free rays 18 and thus also the generated Single order areas in their respective border areas partially, so that on the material web 4 a Application medium layer of essentially the same Layer thickness over the entire width B of the current Material web 4 is generated.
  • Each of the individual free jet nozzles 12 can in the present example via a tax and / or Control device 20 individually controlled and thereby the Emission characteristics of the nozzles 12 and / or the amount of radiated application medium for presetting a desired cross and / or longitudinal profile of the Application medium layer are manipulated.
  • the order medium is applied in excess in the present case and that final longitudinal and / or transverse profile over the downstream doctor device 14, which is not mandatory is employed. It is also within the scope of the invention however, provided the order medium in an alternative Process step essentially without excess to the apply coating surface and only so much Eject application medium from the individual free jet nozzles 12, as for building a given one Layer thickness is required.
  • the device is also electrostatic Charging device 22 equipped, the current Material web 4 during the application of the application medium 2 charges electrostatically and therefore a special one uniform and effective order guaranteed.
  • the charging device 22 for clarity for the sake of only between the material web 4 and one from the Plenty of individual free jet nozzles 12 are shown. However, there is expediently between all nozzles 12 and the material web 4 has a suitable potential.
  • FIG. 3 shows a schematic sectional view of a Single free jet nozzle 12 of the device according to FIGS. 1 and 2.
  • free jet nozzles are used known tongue nozzles used that a wide fanned, narrow flat jet (free jet) with one generate a sharply defined beam pattern and especially with pasty application media as insensitive to constipation and have proven to be easy to maintain.
  • the invention is not exclusively fixed to this type of nozzle.
  • free jet nozzles such as so-called Flat jet nozzles or nozzles with a circular Beam patterns are used, as are combinations of the various Nozzle types. Can be used for certain applications the single free jet nozzles also with one Air admixture may be provided.
  • the single free jet nozzle 12 with is equipped with a non-stick coating 24, so that Application medium does not adhere to the nozzle 12, but from it beads off.
  • this single free jet nozzle 12 special cleaning measures necessary, which is also particularly important when switching to another order medium type from is a big advantage.
  • FIG. 4 is analogous to the representation of FIG. 3 is a schematic sectional view of another type of in of a single free jet nozzle to be used according to the invention 12 shown.
  • This nozzle is also involved a flat jet nozzle, but one essentially parallel to that by a dash-dotted line indicated straight longitudinal axis of the nozzle fanned out flat jet.
  • FIG. 5 shows analogously to the representation according to FIG. 1 a schematic, much simplified side Sectional view of an essential portion of a Device according to the invention according to a second Embodiment.
  • This variant is a device for indirect application of a liquid or pasty Application medium 2 designed on an application roller 32, wherein the circumference of the rotating applicator roller 32 that of the Single free jet nozzles with the application medium 2 acted upon running surface 4 forms.
  • the coating the material web itself then takes place in a nip, through which the material web runs and in which the Application medium 2 from the one serving as the carrier surface Roll surface 4 is transferred to the material web.
  • the Material web and the nip as well as their arrangement are in the drawing for clarity not shown and may be assumed to be known as such.
  • the Distribution tube 10 is in this example as a double wall Component made of a material with non-stick properties, namely a carbon fiber composite, manufactured, wherein an inner tube 10.2 the feed channel for the application medium 2 and the outer tube jacket 10.4 a channel for cooling water 34th forms.
  • the single free jet nozzles 12 are as through the body of the distribution pipe 10 passing narrow, slit-like Outflow channels with a substantially rectangular Passage cross section designed and act as Flat fan nozzles that have a thin, fanned out Generate flat jet 18 of application medium 2.
  • nozzle jet deflection device 36 which deflects the respective jet jet 18 of the application medium 2 emerging from a respective flat jet nozzle 12 in the direction of the running surface 4 .
  • all flat jet nozzles 12 are assigned a common jet deflection device 36, which extends essentially over the entire width of the application roller 32.
  • the nozzle jet deflection device is designed here as a concave baffle plate 36.
  • the baffle 36 can of course have other suitable shape.
  • the baffle plate 36 can be flat or can be concave or convex curved.
  • the drawing also shows that the baffle plate 36 is arranged at a distance D1 from the flat jet nozzles 12.
  • the distance between the nozzle outlet opening and the impact area on the baffle plate 36 is identified by the reference symbol D2.
  • the nozzle jet 18 is deflected in the direction of the running surface 4 and leaves the baffle plate 36 again at its upper free end in order to then move over a further section through the free ambient atmosphere to the surface 4 to be coated.
  • the nozzle jet leaving the baffle plate 36 which, as will be explained in more detail below, has special properties, is identified here with the reference symbol 18 L.
  • the invention is not restricted to the values mentioned above. Depending on the application and type of the individual free jet nozzles used and the respective jet deflection device, a modification according to the invention can deviate considerably from this data.
  • the distance is not fixed, but can be set variably.
  • the arrangement of the nozzle jet deflection device 36 that is to say the baffle plate 36, is adjustable relative to the flat jet nozzles 12.
  • the baffle plate 36 is fastened on a holder 38 which can be moved in a predetermined distance range from the flat jet nozzles 12.
  • This holder 38 can be moved toward and away from the flat jet nozzles 12 by means of a plurality of first actuators 40, which are spaced apart from one another in the width direction of the application roller 32 and act on the holder 38 (indicated by double arrows in FIG. 5).
  • the baffle plate 36 is also pivotally mounted on the holder 38 via an axis 42 and is arranged relative to the flat jet nozzles 12 and the running surface by means of a plurality of second actuators 44 which are spaced apart from one another in the width direction of the application roller 32 and act on the baffle plate 36 and the holder 38 4 swiveling. In this way, the angle of incidence of the flat jets 18 on the baffle plate 36 and the angle of incidence of the jet jet 18 L leaving the baffle plate 36 on the running surface 4 can be adjusted.
  • the flapper 36 also has some flexibility owns, both by evenly pressing all first actuators 40 over substantially the entire Applicator roller width uniform change of the distance as well as by actuating only certain first actuators 40 a locally different change in the distance be achieved.
  • an even one allows Actuate all second actuators 44 one in the essentially the entire application roller width is uniform Change the impact angle during an actuation only certain second actuators 44 one locally causes different changes in the impact angle. It it can be seen that in this way not only the location of the Baffle plate 36 with respect to the flow direction of the Jet streams 18 but also the geometry of the jet stream deflecting device 36 can be manipulated.
  • the nozzle jet deflecting device on the one hand brings about an equalization of the nozzle jets 18, i.e. it functions here simultaneously as a nozzle jet equalizing device arranged between the individual free jet nozzles 12 and the running surface 4, and on the other hand a certain delay or two-dimensional extension or spreading of the Nozzle jets 18. It has been shown that surprisingly, laminar individual jets or flat jets 18 L can be generated in this way, which not only can be localized relatively precisely, but which also have a very even distribution of the application medium due to the interference of the respective individual jets 18 L 2 enable on the current surface 4.
  • the incident or incident angle of the nozzle jet 18 of the liquid or pasty application medium 2 on the nozzle jet deflection device determine the degree of the resulting jet extension, ie the angle of propagation of the laminar flat jet 18 L generated.
  • the excess Order medium 2 is made with the help of a the order location downstream doctor element 14, here: a rotating smooth roll doctor bar with approx. 35 mm diameter, doctored and returned to an order medium cycle, which by reference numeral 46 is indicated.
  • the doctor blade stick 14 also serves as Leveling device, that on the running surface 4 applied application medium 2 evened out.
  • Fig. 6a shows analogous to the representation of Fig. 1 and Fig. 5 is a schematic side sectional view of a essential part of a device according to the invention according to a third embodiment.
  • the device 5 also has this model between the Flat jet nozzles 12 and the running surface 4 arranged and again as a baffle-like construction trained jet deflector 48.
  • This jet deflecting device 48 immediately in front of the nozzle outlet openings of the Flat jet nozzles 12 is arranged and one of the Nozzle outlet opening in the direction of the one to be coated Surface 4 extending guide surface 48.2 for the respective jet 18 of the emerging from a nozzle 12 Order medium 2 forms.
  • the jet deflection device 48 here is a lip-like extension of the Flat jet nozzles 12. On the exact design of this special nozzle jet deflection device 48 will follow be discussed in more detail.
  • the distribution pipe 10 has a rectangular cross-sectional shape in the present case. Narrow and essentially rectangular (round, oval or other suitable shapes are possible) configured as single free jet nozzles 12. Outflow bores are provided on the intersection between two wall sections of the distribution pipe 10 which are perpendicular to one another. In cooperation with the nozzle jet deflection device 48, these outflow bores largely have the properties of flat jet nozzles, that is to say they each produce a flat, fanned-out jet jet 18 L (see also FIG. 6 b).
  • each individual free jet nozzle 12 (in FIG. 6b only two adjacent nozzles are shown for reasons of clarity, which are designated 12a and 12b for better distinction) are assigned their own separate nozzle jet deflection device 48 (here: 48a and 48b).
  • the latter device is in each case a baffle plate fastened to an outer wall of the rectangular distribution pipe 10, which, however, is referred to in the context of the present description as a baffle strip 48 for better differentiation from the baffle plate 36 mentioned above.
  • the baffle bar 48 has a guide surface section 48.2, which adjoins the nozzle outlet opening of the single free jet nozzle 12 in a fluidically advantageous manner.
  • the nozzle jet 18 leaving the outlet opening of a respective individual free jet nozzle 12 thus flows directly onto the guide surface section 48.2 of the baffle strip 48 and along this section 48.2, is deflected in the direction of the roller 32 and leaves the guide surface section 48.2 and thus the baffle strip 48 (here : 48a and 48b) at their upper free end as a narrow, fanned laminar flat jet 18 L.
  • the laminar flat jet 18 L then runs a certain distance through the free ambient atmosphere and then strikes the surface 4 of the roller 32. As indicated in FIG.
  • the respectively adjacent nozzle jet deflection devices or baffle strips 48a, 48b are offset arranged in relation to each other, so that the adjacent fanned flat jets 18 L emanating from the adjacent individual free jet nozzles 12a and 12b (hereinafter analogous to the two nozzles 12a, 12b considered here and their respective jet deflection devices 48a and 48b with 18a L and 18b L denotes) of the application medium 2 on their way to the surface 4 to be coated, do not touch or penetrate.
  • the offset V is therefore expediently greater than or equal to the thickness of the respective flat beams 18a L , 18b L.
  • the fanned flat beams 18a L , 18b L and partial areas of the adjacent baffle strips 48a, 48b are shown folded into the viewing plane for illustrative purposes.
  • the lines of incidence La, Lb of the adjacent flat beams 18a L , 18b L are also drawn into the image plane. It can be seen that the distance Va of the impact lines La, Lb measured in the running direction of the surface 4 approximately corresponds to the offset V of the baffle strips 48a, 48b if, as assumed here, the orientations of the baffle strips 48a, 48b relative to the surface 4 and thus the In the lateral direction, the radiation angles (similar to ⁇ in FIG. 1) of the flat beams 18a L , 18b L relative to the surface 4 are the same.
  • the distance Va can be changed, for example, by varying the aforementioned parameters, Va can also become 0, ie the flat beams 18a L , 18b L then penetrate each other when they strike the surface 4 at a common line of incidence.
  • the adjacent individual application areas generated by such a configuration of the individual free jet nozzles 12 and their associated nozzle jet deflection devices 48a, 48b can at least partially penetrate (U) in their respective edge areas due to the overlay effect resulting from the movement of the running surface 4, so that As the running surface 4 progresses, a closed application medium layer can be produced over essentially the entire width of the surface 4 to be coated.
  • This Device comprises several, i.e. in the present case two, a running material web 4 in the width direction B extending and from a variety of individual free jet nozzles 12 (each facing the material web 4 and in the figure indicated by circles) formed nozzle rows R1, R2, which in Longitudinal direction of the material web 4, that of the in the drawing direction of progress indicated by an arrow Material web 4 corresponds to, are spaced.
  • the row of nozzles R1 runs essentially parallel to Width direction B, while the nozzle row R2 is in one Angle ⁇ extends to the width direction B.
  • the invention is not limited to the above embodiments, which is only the general explanation of the basic idea serve the invention, limited. Within the scope of protection can the inventive method and device according to the invention rather than that Assume the embodiments described above.
  • the method and the device can in particular Features that are a combination of the respective Represent individual features of the associated claims.
  • the device can also have one or more Free jet nozzles upstream of doctor blades or Have cleaning doctor devices and the like.
  • the invention provides the application medium by two or more in the width direction of the Surface and / or extending at an angle to it the rows of individual free jet nozzles, each are spaced apart in the longitudinal direction of the surface, to be applied, differing from the individual rows of nozzles ejected individual quantities of the application medium during the Progression of the current surface to one Total required total order quantity.
  • the order can also be used here either without or with Surplus.
  • the invention also includes such a variant in which one separate jet deflection device only for certain Flat jet nozzles from the total number of available Flat jet nozzles is provided. Otherwise, the on the length of the jet deflecting device relative to the jet direction be variably adjustable. It is also through a specific local length specification of the jet deflection device their effect on the jet influenced.

Landscapes

  • Application Of Or Painting With Fluid Materials (AREA)
  • Coating Apparatus (AREA)
  • Electrostatic Spraying Apparatus (AREA)
  • Absorbent Articles And Supports Therefor (AREA)

Claims (36)

  1. Procédé pour l'application directe ou indirecte, sur une ou sur les deux faces, d'un fluide de couchage liquide ou pâteux (2) sur une surface en mouvement (4), en particulier en papier ou en carton, dans lequel
    le fluide de couchage (2) est appliqué sur la surface (4) en une pluralité de plages d'application individuelles, au moyen d'une pluralité de buses à jet libre individuel (12, 12a, 12b) disposées l'une à côté de l'autre et/ou l'une derrière l'autre à distance l'une de l'autre dans le sens transversal (B) et/ou dans le sens longitudinal de la surface (4) et nettement écartées (D) de la surface (4), hors desquelles le fluide de couchage (2) sort chaque fois en un rideau fermé circulant à travers l'atmosphère ambiante,
    dans lequel des plages d'application individuelles qui sont respectivement voisines se mélangent au moins partiellement (U) dans leurs zones de bord respectives, de telle manière qu'une couche de fluide de couchage soit produite sur sensiblement toute la largeur (B) de la surface à revêtir (4).
  2. Procédé suivant la revendication 1, caractérisé en ce que la surface (4) et/ou le fluide de couchage (2) est chargé par voie électrostatique (22) avant et/ou pendant l'application.
  3. Procédé suivant la revendication 1 ou 2, caractérisé par la variation d'une caractéristique d'expulsion et/ou d'une quantité du fluide de couchage expulsé (2) par une ou plusieurs de la pluralité des buses à jet libre individuel (12) pour la production d'un profil transversal et/ou longitudinal désiré de la couche de fluide de couchage.
  4. Procédé suivant une ou plusieurs des revendications précédentes, caractérisé par la variation (26) de la distance (D) de la buse à jet libre individuel (12) par rapport à la surface en mouvement (4).
  5. Procédé suivant l'une quelconque des revendications 1 à 4, caractérisé en ce que le fluide de couchage (2) est appliqué sensiblement sans excédent sur la surface (4) et que l'on n'expulse à cet effet hors des buses à jet libre individuel (12) que la quantité de fluide de couchage (2) qui est nécessaire pour la formation de l'épaisseur de couche prédéterminée.
  6. Procédé suivant l'une quelconque des revendications 1 à 4, caractérisé en ce que le fluide de couchage (2) est appliqué avec un excédent, dans lequel la quantité du fluide de couchage (2) correspond à 2 à 5 fois le dépôt final à réaliser.
  7. Procédé suivant la revendication 6, caractérisé en ce que le fluide de couchage (2) appliqué en excédent est raclé au moyen d'au moins un élément de racle (14) et est renvoyé dans un circuit de fluide de couchage (46).
  8. Procédé suivant une ou plusieurs des revendications précédentes, caractérisé en ce que le fluide de couchage (2) appliqué sur la surface en mouvement (4) est égalisé au moyen d'au moins un dispositif d'égalisation (14).
  9. Procédé suivant une ou plusieurs des revendications précédentes, caractérisé en ce que le fluide de couchage (2) est appliqué par deux ou plus de deux rangées de buses (R1, R2), composées des buses à jet libre individuel (12) et s'étendant dans le sens transversal de la surface (4) et/ou sous un angle (β) par rapport à celui-ci, qui sont chaque fois espacées l'une de l'autre dans le sens longitudinal de la surface (4), dans lequel des quantités individuelles du fluide de couchage (2) expulsées hors des rangées de buses individuelles s'additionnent pour obtenir la quantité totale d'application nécessaire pendant la progression de la surface en mouvement (4).
  10. Procédé suivant une ou plusieurs des revendications précédentes, caractérisé en ce que des jets respectifs (18) du fluide de couchage (2) sortant d'une buse à jet libre individuel respective (12) est homogénéisé (36, 48) avant d'atteindre la surface en mouvement (4).
  11. Procédé suivant une ou plusieurs des revendications précédentes, caractérisé en ce que les jets respectifs (18) du fluide de couchage (2) sortant d'une buse à jet libre individuel respective (12) sont déviés (36, 48, 48a, 48b) avant d'atteindre la surface en mouvement (4).
  12. Procédé suivant une ou plusieurs des revendications précédentes, caractérisé en ce que le fluide de couchage (2) est appliqué sous la forme de jets plats laminaires (18L, 18aL, 18bL) sur la surface en mouvement (4).
  13. Procédé suivant une ou plusieurs des revendications précédentes, caractérisé en ce qu'une couche limite d'air (30) entraínée par la surface en mouvement (4) est éliminée (28) avant les buses à jet libre individuel (12) par rapport au sens de défilement de la surface (4).
  14. Dispositif pour l'application directe ou indirecte, sur une ou sur les deux faces, d'un fluide de couchage liquide ou pâteux (2) sur une surface en mouvement (4), en particulier en papier ou en carton, comprenant une face d'appui ou de support (6) pour la surface en mouvement (4) et une pluralité de buses à jet libre individuel (12) disposées l'une à côté de l'autre et/ou l'une derrière l'autre, à distance l'une de l'autre par rapport au sens transversal (B) et/ou au sens longitudinal de la surface (4), hors desquelles le fluide de couchage (2) sort chaque fois en un rideau fermé circulant à travers l'atmosphère ambiante, et qui sont nettement écartées (D) de la face d'appui ou de support (6) et ainsi de la surface (4) supportée par la face d'appui ou de support (6).
  15. Dispositif suivant la revendication 14, caractérisé en ce que les buses à jet libre individuel (12) forment deux ou plus de deux rangées de buses s'étendant dans le sens transversal de la surface (4) et/ou sous un angle (β) par rapport à celui-ci, et qui sont chaque fois espacées l'une de l'autre dans le sens longitudinal de la surface (4).
  16. Dispositif suivant la revendication 15, caractérisé en ce qu'il est prévu, entre au moins deux rangées de buses, un dispositif de séchage intermédiaire (50), connu en soi, pour le séchage intermédiaire de la surface revêtue (4).
  17. Dispositif suivant une ou plusieurs des revendications précédentes, caractérisé en ce que la caractéristique d'expulsion et/ou la quantité expulsée des buses à jet libre individuel (12) est réglable.
  18. Dispositif suivant une ou plusieurs des revendications précédentes, caractérisé en ce que la distance (D) des buses à jet libre individuel (12) à la surface (4) est réglable (26).
  19. Dispositif suivant une ou plusieurs des revendications précédentes, caractérisé en ce que les buses à jet libre individuel ont la forme de buses à jet plat (12).
  20. Dispositif suivant une ou plusieurs des revendications précédentes, caractérisé en ce que les buses à jet libre individuel (12) sont pourvues d'un revêtement antiadhésif (24) et/ou sont fabriquées, au moins en partie, en une matière ayant des propriétés antiadhésives.
  21. Dispositif suivant une ou plusieurs des revendications précédentes, caractérisé en ce que un angle de sortie (α) du jet (18) sortant hors d'une buse à jet libre individuel respective (12), mesuré entré
    un premier plan de référence (E1) mené par une buse à jet libre individuel respective (12) et
    un second plan de référence (E2) mené par un axe central d'un jet respectif (18),
    est inférieur ou égal à 30°.
  22. Dispositif suivant la revendication 21, caractérisé en ce que l'angle de sortie (α) est réglable (52).
  23. Dispositif suivant une ou plusieurs des revendications précédentes, caractérisé en ce que les buses à jet libre individuel (12) sont des buses plates.
  24. Dispositif suivant une ou plusieurs des revendications précédentes, caractérisé en ce qu'il est prévu, entre les buses à jet libre individuel (12) et la surface en mouvement (4), au moins un dispositif d'homogénéisation des jets (36, 48), qui homogénéise le jet respectif (18) du fluide de couchage (2) sortant d'une buse à jet libre individuel respective (12).
  25. Dispositif suivant une ou plusieurs des revendications précédentes, caractérisé en ce qu'il est prévu, entre les buses à jet libre individuel (12) et la surface en mouvement (4), au moins un dispositif de déviation de jet (36, 48, 48a, 48b), qui dévie le jet respectif (18) du fluide de couchage (2) sortant d'une buse à jet libre individuel respective (12) en direction de la surface en mouvement (4).
  26. Dispositif suivant la revendication 25, caractérisé en ce qu'au moins un dispositif séparé de déviation de jet (48a, 48b) est associé à chaque buse à jet libre individuel (12a, 12b).
  27. Dispositif suivant la revendication 25, caractérisé en ce qu'un dispositif de déviation commun (36) est associé aux buses à jet libre individuel (12).
  28. Dispositif suivant l'une quelconque des revendications 25 à 27, caractérisé en ce que
    la géométrie du dispositif de déviation de jet (36), et/ou
    l'agencement du dispositif de déviation de jet (36) par rapport à la surface en mouvement (4) et/ou par rapport à une buse à jet libre individuel respective (12)
    est réglable (40, 44).
  29. Dispositif suivant une ou plusieurs des revendications précédentes, caractérisé en ce que le dispositif de déviation de jet (36) est disposé à distance (D1) des buses à jet libre individuel (12).
  30. Dispositif suivant une ou plusieurs des revendications précédentes, caractérisé en ce que le dispositif de déviation de jet (48; 48a, 48b) est disposé immédiatement avant l'ouverture de sortie des buses des buses à jet libre individuel (12a, 12b) et forme une face de guidage (48.2) pour le jet (18) du fluide de couchage sortant (2), qui s'étend de l'ouverture de sortie des buses en direction de la surface à revêtir (4).
  31. Dispositif suivant une ou plusieurs des revendications précédentes, caractérisé en ce que des dispositifs de déviation de jet respectivement voisins (48a, 48b) sont disposés en décalage (V) l'un par rapport à l'autre, de telle manière que des jets voisins (18aL, 18bL) du fluide de couchage (2) sortant des buses à jet libre individuel (12a, 12b) ne se touchent pas ou ne se mélangent pas sur leur chemin vers la surface à revêtir (4).
  32. Dispositif suivant une ou plusieurs des revendications précédentes, caractérisé en ce que le dispositif de déviation de jet a la forme d'une chicane (36, 48).
  33. Dispositif suivant une ou plusieurs des revendications précédentes, caractérisé en ce que celui-ci présente au moins un dispositif de chargement électrostatique (22) pour créer une charge électrostatique sur la surface en mouvement (4) et/ou sur le fluide de couchage (2).
  34. Dispositif suivant une ou plusieurs des revendications précédentes, caractérisé en ce qu'au moins un dispositif d'élimination de couche limite d'air (28), qui élimine une couche limite d'air (30) entraínée par la surface en mouvement (4), est installé avant les buses à jet libre individuel (12) par rapport à un sens de défilement de la surface en mouvement (4).
  35. Dispositif suivant une ou plusieurs des revendications précédentes, caractérisé en ce que celui-ci possède un tube de répartition (10) communiquant avec les buses à jet libre individuel (12) pour guider le fluide de couchage (2) vers les buses à jet libre individuel (12), et qui est pourvu d'un revêtement antiadhésif et/ou qui est fabriqué au moins en partie en une matière ayant des propriétés antiadhésives.
  36. Utilisation d'une pluralité de buses à jet libre individuel (12) disposées l'une à côté de l'autre et/ou l'une derrière l'autre, à distance l'une de l'autre, par rapport à un sens transversal (B) et/ou un sens longitudinal d'une surface en mouvement (4), en particulier en papier ou en carton, hors desquelles sort chaque fois un fluide de couchage liquide ou pâteux (2) en un rideau fermé circulant à travers l'atmosphère ambiante, et qui sont nettement écartées (D) de la surface (4), pour l'application directe ou indirecte, sur une ou sur les deux faces, du fluide de couchage (2) sur la surface en mouvement (4).
EP98109532A 1997-05-27 1998-05-26 Procédé et dispositif pour enduire un matériau fluide ou pâteux sur une bande en mouvement Expired - Lifetime EP0881330B1 (fr)

Applications Claiming Priority (2)

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DE19722159 1997-05-27
DE19722159A DE19722159A1 (de) 1997-05-27 1997-05-27 Verfahren und Vorrichtung zum direkten oder indirekten Auftragen eines flüssigen oder pastösen Auftragsmediums auf eine laufende Oberfläche

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EP0881330A2 EP0881330A2 (fr) 1998-12-02
EP0881330A3 EP0881330A3 (fr) 1999-10-13
EP0881330B1 true EP0881330B1 (fr) 2002-11-06

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US (3) US6063450A (fr)
EP (1) EP0881330B1 (fr)
JP (1) JPH10328585A (fr)
AT (1) ATE227376T1 (fr)
BR (1) BR9802994A (fr)
CA (1) CA2238846A1 (fr)
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Publication number Priority date Publication date Assignee Title
DE10343021A1 (de) * 2003-09-16 2005-04-07 Voith Paper Patent Gmbh Auftragsverfahren
EP3842591A1 (fr) 2019-12-23 2021-06-30 Andritz Küsters GmbH Dispositif d'application d'un milieu d'application
US11718961B2 (en) 2019-12-23 2023-08-08 Andritz Küsters Gmbh Device for applying a treatment substance

Also Published As

Publication number Publication date
US6410100B1 (en) 2002-06-25
ATE227376T1 (de) 2002-11-15
US6063450A (en) 2000-05-16
US6494954B1 (en) 2002-12-17
JPH10328585A (ja) 1998-12-15
EP0881330A2 (fr) 1998-12-02
BR9802994A (pt) 1999-11-03
DE59806147D1 (de) 2002-12-12
EP0881330A3 (fr) 1999-10-13
CA2238846A1 (fr) 1998-11-27
DE19722159A1 (de) 1998-12-03

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