EP0115621B1 - Procédé et appareil pour la stabilisation de rideaux liquides en chute libre - Google Patents

Procédé et appareil pour la stabilisation de rideaux liquides en chute libre Download PDF

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Publication number
EP0115621B1
EP0115621B1 EP83113019A EP83113019A EP0115621B1 EP 0115621 B1 EP0115621 B1 EP 0115621B1 EP 83113019 A EP83113019 A EP 83113019A EP 83113019 A EP83113019 A EP 83113019A EP 0115621 B1 EP0115621 B1 EP 0115621B1
Authority
EP
European Patent Office
Prior art keywords
curtain
liquid
coating
holders
edge
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
Application number
EP83113019A
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German (de)
English (en)
Other versions
EP0115621A3 (en
EP0115621A2 (fr
Inventor
Günther Dr. Koepke
Hans Dipl.-Ing. Frenken
Heinrich Dipl.-Ing. Bussmann
Kurt Browatzki
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.)
Agfa Gevaert AG
Original Assignee
Agfa Gevaert AG
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 Agfa Gevaert AG filed Critical Agfa Gevaert AG
Publication of EP0115621A2 publication Critical patent/EP0115621A2/fr
Publication of EP0115621A3 publication Critical patent/EP0115621A3/de
Application granted granted Critical
Publication of EP0115621B1 publication Critical patent/EP0115621B1/fr
Expired legal-status Critical Current

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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
    • B05C5/00—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
    • B05C5/007—Slide-hopper coaters, i.e. apparatus in which the liquid or other fluent material flows freely on an inclined surface before contacting the work
    • B05C5/008—Slide-hopper curtain coaters
    • 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
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
    • G03C1/00—Photosensitive materials
    • G03C1/74—Applying photosensitive compositions to the base; Drying processes 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
    • B05C9/00—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important
    • B05C9/06—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important for applying two different liquids or other fluent materials, or the same liquid or other fluent material twice, to the same side of the work
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
    • G03C1/00—Photosensitive materials
    • G03C1/74—Applying photosensitive compositions to the base; Drying processes therefor
    • G03C2001/7433—Curtain coating
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
    • G03C1/00—Photosensitive materials
    • G03C1/74—Applying photosensitive compositions to the base; Drying processes therefor
    • G03C2001/7455—Edge bead nonuniformity coated at the border
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
    • G03C1/00—Photosensitive materials
    • G03C1/74—Applying photosensitive compositions to the base; Drying processes therefor
    • G03C2001/747—Lateral edge guiding means for curtain coating
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S118/00—Coating apparatus
    • Y10S118/04—Curtain coater

Definitions

  • the invention relates to a method and a device for stabilizing free-falling liquid curtains with one or more layers when coating webs or objects continuously guided past a coating point by the curtain coating method.
  • curtain coating processes are increasingly being used as precision coating processes in the furniture industry for painting boards, for coating other objects and in the photographic industry for applying several photographic layers at the same time to moving material webs.
  • Directions are known, for example, from US Pat. Nos. 3,508,947, 3,632,374 and 3,867,901.
  • the coating liquid emerges at the lower end of an outflow gap arranged transversely above the support to be coated and forms a free-falling curtain there directly.
  • the coating liquid is pressed through a metering gap opening into a downwardly inclined sliding surface, then flows down the sliding surface in a thin film following gravity and only forms the free-falling curtain at its lower end, the pouring edge.
  • the liquid curtain can have one or more layers.
  • the liquid curtain lies on an item to be coated, which is carried out continuously under the curtain.
  • the quality of the coating is largely determined by the properties of the liquid curtain, so that the sliding surface caster must first ensure that a stable, laminar flowing liquid film is formed and from this an equally stable and laminar flowing liquid curtain; a stable liquid curtain must be formed immediately in the slot caster. Deviations from the laminar flow lead to casting errors. Such casting errors occur due to disturbances, especially in the peripheral area, since the free-falling liquid curtain tends to contract due to its surface tension.
  • the curtain holders In order to avoid or reduce constriction of the curtain due to the surface tension, it is known to guide the curtain at the edges through curtain holders.
  • the curtain holders are made of a few millimeters thick, solid material (metal or plastic) and attached to the two edges of the coating or pouring edge.
  • the curtain holders are inclined at an angle of 5 - 10 ° in the plane of the curtain to prevent the curtain from tearing off the curtain holders.
  • British patent specification 2 021 001 it is known to replace the usual rigid curtain holders with a circumferential band in order to reduce the friction of the liquid curtain on the curtain holders.
  • the curtain holder can be arranged so that the material to be coated is coated almost to the edge, that it is coated to the edge or so that the width of the coating liquid extends beyond the web on both sides.
  • curtain holders which enable a borderless cast-on, end within the web edges a few millimeters above the layer support material and have at their lower ends mostly smoothing elements (platelets or tufts of hair) that rub on the web and thus lead the free-falling curtain to the web surface.
  • smoothing elements platelets or tufts of hair
  • Such curtain holders are known from US Pat. No. 3,867,901. With these edge holders it is possible to achieve bead-free coating edges, but these edge holders have considerable disadvantages.
  • the smoothing process which takes place directly in the edge area of the layer support and under the edge holder creates irregularities which considerably limit the useful width of the coated material.
  • the useful width of the free-falling liquid curtain is reduced by the curtain holder that is inclined inwards by 5-10 °, as a result of which the coating devices for producing the curtain must be wider than the material to be coated.
  • the smoothing elements can crust over time, so that they no longer fulfill their task of distributing excess coating material. The result is an edge bead thickening that does not dry in the downstream dryer, which can lead to sticking of the wound webs.
  • the curtain holders are arranged so far next to the edges of the material to be coated that the curtain is wider than the material to be coated. A complete coating of the material is achieved over its entire width, the edge irregularities being close to the edge holders and thus outside the useful width of the web.
  • the coating material falling next to the edges of the web is collected in collecting trays for recycling.
  • This process can be used to create single or multi-layer castings at high speed.
  • this procedure has serious disadvantages. Since the curtain is usually 1 - 6 cm wider on each side than the web to be coated, the entire coating device must be made wider and the dosing systems larger. Since multilayer coatings are predominantly carried out in the photographic industry, the mixed layers falling past the edges can no longer be used and thus losses. With a web width of 100 cm there is an intolerable loss of on average up to 10% of the valuable Coating material.
  • the invention is therefore based on the object of providing a method and a device of the type mentioned at the outset, with which it is possible in a simple manner to guide a free-falling liquid curtain at its edges in such a way that the losses of high-quality coating materials are avoided, thick edge beads prevented, by good wetting at the edges, the casting stability increased, and a problem-free edge-free casting can be made possible.
  • curtain holders are used for the lateral guidance of the free-falling curtain which arises on the coating edge of the coating device, from which an additional liquid escapes in the direction of the curtain which escapes connects to the curtain and forms triangular stabilizing liquid bridges between the curtain and the curtain holders from the coating edge until the curtain hits the layer support.
  • An advantageous implementation of the method is possible in that the metering of the amount of liquid into the curtain holder for lateral guidance of the curtain is selected such that the liquid bridges start directly at the coating edge and become triangular in the direction of fall of the curtain and the free-falling curtain stabilizes it Enable contraction.
  • the method shows very good results if low-viscosity liquids are used to generate the liquid bridges between the curtain and the side curtain holders, the viscosities of which are between 1 mPas and 20 mPas, preferably between 1 mPas and 10 mPas.
  • the width of the curtain and the metered amount for the liquid emerging from the curtain holders are selected such that the layer support is coated with coating liquid right up to its edges and that the liquid emerging from the side of the curtain holders is the wetting of the edges the layer carrier takes over and, if the liquid does not hit the web, is collected and used again.
  • the curtain In the middle or up to a few centimeters from the curtain holder inwards, the curtain is accelerated with good approximation according to the Fall Act and has a fall height of e.g. 5 cm a fall speed of approx. 100 cm / s.
  • the coating liquid in the vicinity of the curtain holders has a considerably lower speed because it is braked when sliding along the curtain holders. While there is a falling speed in the middle of the curtain corresponding to the respective falling height h, the speed drops in the area of the curtain holder and reaches a minimum directly at the curtain holder, namely the vertical flow speed.
  • the different speeds within the curtain also produce different thicknesses. In the middle, at a free falling speed, the curtain is therefore thinner than in the edge area near the curtain holder.
  • the contraction forces generated by the surface tension of the curtain act on the thicker layer of the curtain in the edge area, so that about one to two centimeters of the curtain holder weakens the curtain, so that the curtain tears off preferentially in this area.
  • the risk of tearing can be reduced by tilting the curtain holder.
  • a greater positive inclination of the curtain holders inward is undesirable for serious other disadvantages.
  • the method according to the invention eliminates the increased tendency of the coating to tear when the curtain holders are arranged vertically, outwardly or only slightly inwardly.
  • the tendency of the curtain to contract due to its surface tension is yielded to a certain, selectable extent by the laterally separate supply of auxiliary liquid, which leads to a higher stability of the curtain in the edge region.
  • the liquid is forcibly fed in a steadily increasing amount of liquid from the pouring edge in the direction of fall of the curtain to the impact on the object to be coated, so that the liquid bridge between the curtain edges and the curtain holders becomes ever wider and thus the condition of a certain stabilizing Contraction of the curtain is enough.
  • the curtain can be optimally stabilized by adjusting the viscosity, the surface tension and the amount of liquid fed from the side. Simplified, you can think of the liquid bridge as an elastic spring between the curtain and the edge holder, which takes over a balancing function independently in a surprisingly simple manner.
  • the curtain coating device with a stabilizing device for the free-falling curtain for single or multiple coating of layer carriers continuously guided past a coating point, such as sheets or objects, is characterized according to the invention in that between the coating edge of the coating device and the sheet for lateral guidance of the Hollow curtain holders are arranged on both sides inside, which are provided with a separate liquid supply in their entire height with a distribution channel and a dispenser for the auxiliary liquid in the direction of the curtain to form liquid bridges between the curtain and curtain holders.
  • a particularly expedient embodiment of the device is characterized in that the curtain holders are closed hollow bodies at the top and bottom, which are connected to a liquid supply device, the interior of which serves as a distribution channel for the auxiliary liquid and that the tubular hollow bodies for forming the liquid bridges in the direction of the curtain a slot are provided as a dispenser for the auxiliary liquid.
  • closed tubular hollow bodies made of a porous, liquid-permeable material are used as curtain holders for the device, which are provided with a liquid supply device and are coated on the entire surface with a liquid layer to form the liquid bridges.
  • a further embodiment is characterized in that the curtain holders are closed hollow bodies at the top and bottom with a liquid supply device, which are provided with a slot in the direction of the curtain as a dispensing device, the slot being designed with porous, liquid-permeable material.
  • the device is characterized by the considerable improvement in the coating conditions, by its simple and inexpensive production possibility and by the possibility of attaching the curtain holders to existing coating devices, the curtain holders being arranged close to the coating edge of a coating device, so that the liquid bridges start directly at the coating edge and the curtain holders are arranged in the plane of the vertically free-falling liquid curtain towards the curtain by an angle -a and away from the curtain by an angle + a, the angle a being from -10 ° to + 10 °, preferably from -5 ° Is adjustable up to 0 °.
  • the device can also be adapted to all coating problems within wide limits, with the amount of liquid metered into the curtain holder being adjustable at the point of impact of the curtain on the support for the choice of the width of the liquid bridges, so that depending on the metered amount of liquid smaller or larger triangular areas on both sides of the curtain Form liquid bridges.
  • a curtain caster of the type of the flat caster or beak caster is shown.
  • the coating liquids are metered in laterally to the caster (not shown), rise to outlet slots 1 (see FIG. 2) and lie on the sliding surfaces 2 as a layer.
  • the individual layers flow down the glpit surfaces 2, lie on top of one another and flow to the beak-shaped coating edge 3 on which a free-falling curtain 4 forms, which strikes the continuously moving (arrows) web 5 via the height of fall h and acts as Lay the shift package on lane 5.
  • the web 5 is guided and diverted on a coating roller 7 at the point of impact of the curtain 4.
  • the width of the coating roller 7 is smaller than the width of the diverted web 5 so that the web edges are exposed.
  • the coating roller 7 is mounted on a wider shaft 8 and is driven by this.
  • the free-falling liquid curtain 4 is guided laterally by two curtain holders 9 which, contrary to the design in previously known devices, are arranged vertically, that is to say at an angle ⁇ 0 ° (FIG. 3).
  • an auxiliary liquid 11 is fed to the curtain holders 9 through a feed line 10.
  • the curtain holders 9 supplied liquid 11 is distributed in a distribution channel 12 (FIG. 3) over the entire height of the curtain holder from the coating edge 3 to the impingement of the copessigke i tsvorhanges 4 on the web 5, and emerges from a slot 13 (Fig.
  • the liquid bridge 14 has the width 0 at the coating edge 3, since the supply of the liquid 11 begins at this point. In the direction of fall of the curtain, the liquid bridge 14 becomes wider and wider since the amount of liquid emerging from the slot 13 adds up. At the lower end of the curtain holder 9, the liquid bridge 14 reaches a width b (FIG. 3).
  • the self-adjusting triangular shape of the liquid bridge 14 surprisingly corresponds exactly to the stability requirements of the curtain 4 and also enables a cost-saving and high-quality coating of the web 5.
  • the web 5 can either over its entire width. out with the coating liquid and the curtain 4, or exactly up to the edges of the web 5 or finally up to a few millimeters in front of the edges.
  • 1 shows a coating up to just before the edges of the web, which results in very good wetting of the edge regions of the web 5, the edge beads of the coating are considerably reduced and high-quality coating liquids are saved.
  • 1 and 3 a narrow edge strip of the web is wetted and coated with the auxiliary liquid 11. The remaining auxiliary liquid 11 falling between the web edges and the curtain holders 9 is thus free of high-quality coating liquids and is collected by collecting trays 15 and recycled (see arrow).
  • FIG. 2 shows the function of a bill curtain coating device already mentioned above.
  • the layers peeling off at the coating edge 3 fall as freely falling Liquid curtain 4 over the drop height h onto the layer support 5 continuously moving underneath it, for example a photographic film or paper web, and lay up as a layer package 6.
  • the liquid of the curtain 4 accelerates, so that the curtain 4 towards the web 5 becomes increasingly thinner.
  • Contraction forces arise in the curtain, which aim to reduce the width of the curtain.
  • This contraction can be counteracted to a small extent by curtain holders 9, but there is a risk that the curtain 4 will detach itself from the curtain holders at the slightest occasion, that is, tear it off.
  • the liquid bridges 14 are produced by the curtain fixturers 9, into which an auxiliary liquid 11 is metered in laterally through a nozzle 10.
  • the auxiliary liquid 11 is distributed over the entire height in distribution pipes 12 in the curtain holders 9 and emerges through a narrow slot or gap 13 in the plane of and in the direction of the curtain 4 and already connects to the liquid of the curtain 4 at the coating edge 3
  • the emerging auxiliary liquid 11 adapts to the contraction of the curtain 4, so that a triangular liquid surface is created as the liquid bridge 14.
  • the excess auxiliary liquid 11 falling between the curtain holders 9 and the edges of the web 5 is collected in collecting trays 15 and reused.
  • the curtain holder 3 are shown in the vertical position (a- 0 °). They are advantageously pivoted about a pivot point on the coating edge 3 in the plane of the curtain 4 and can thus be adjusted by an angle (+ a, -a). Surprisingly, with this method and the device, not only positive angles of a e.g. between +5 and + 10 °, but preferably also angle a between +0 and -10 ° can be set without the liquid curtain tearing.
  • Aqueous solutions with the addition of wetting agents can be used as auxiliary liquids in the curtain holders.
  • Gelatin solutions of appropriate concentration with or without added wetting agent are also suitable.
  • Other polymers such as e.g. Cellulose esters (Kelco), polyacrylamide etc. If coatings with solvent-containing layers, e.g. with magnetic varnishes, the curtain holders are fed with appropriate solvent combinations.
  • FIGS. 4 to 7 show different embodiments of the curtain holders 9 on the basis of cross sections along the line AA in FIG. 2.
  • Fig. 4 shows a particularly simple curtain holder 9.
  • a tube 16 closed at the top and bottom was provided with a narrow slot 13, the inner bore being used as a distribution channel 12.
  • the distribution channel 12 is provided with a supply nozzle 10 through which the auxiliary liquid 11 is supplied.
  • the slot 13 is arranged in the direction of the curtain 4 and has a width of 0.2 to 0.8 mm, preferably 0.3 to 0.4 mm.
  • the auxiliary liquid 11 emerging from the slot 13 forms a liquid bridge 14 to the curtain 4.
  • Fig. 5 shows the section through a special embodiment of a curtain holder 9 with a flat elongated cross section and a large distribution channel 12 and a long slot 13 for the directed discharge of the auxiliary liquid 11 to form a stable liquid bridge 14 to the curtain 4.
  • the auxiliary liquid 11 is through a Stub 10 fed to the distribution channel 12.
  • a tube made of porous, liquid-permeable material 20, closed at the top and bottom, is used as the curtain holder 9.
  • the auxiliary liquid 11 is supplied through a nozzle 10 to the bore 12, which serves as a distribution channel.
  • a gap is not necessary in this embodiment, since the liquid 11 is driven through the pores under pressure of the metering device and forms a closed liquid film around the tube, which is correspondingly thicker in the direction of fall of the curtain 4 and drawn off from the curtain 4 as a liquid bridge 14 becomes.
  • the film formed around the tube 20 also prevents incrustation and hardening of particularly volatile substances and rinses deposits such as dust or fluff away from the atmosphere.
  • FIG. 7 shows a curtain holder 9 according to FIG. 4, the gap 13 of which is designed to be much wider in order to avoid incrustations and into which a porous liquid-permeable material 21 is incorporated.
  • curtain holders 9 Other types of designs for the curtain holders 9 are possible, for example with a triangular cross section or other cross sections, but have not been shown since they are in principle similar to the ones shown.
  • curtain holders described can be used in the same way for all curtain coating devices, for example also for a curtain coating device in which the coating liquid is fed from both sides to a coating edge, according to European patent 0 017 126, for slot casters, extrusion casters or also for overflow casters which the coating liquid runs from a container over a weir and is placed by the weir as a free-falling curtain on a material to be coated.
  • curtain holders described are also suitable for non-photographic coatings, for example for coatings with magnetic lacquers, paints, glues, polymer solutions or similar coating liquids.
  • a coating device according to FIG. 1 was provided with curtain holders according to FIG. 5 and used for a single-layer coating.
  • a PE-coated, 230 ⁇ m thick paper web was used as a layer support.
  • the coating width was 11 cm.
  • the casting quality was good and there was a very small bead thickness at the edge of the web.
  • the curtain was very stable. There was no loss of high quality coating material.
  • a coating device according to FIG. 1 was provided with curtain holders according to FIG. 5 and used for a coating with 3 layers.
  • a triacetate film with a thickness of 128 ⁇ m was coated.
  • the coating width was 11 cm.
  • the casting quality was good and there was a very small bead thickness at the edge of the web.
  • the curtain was very stable.
  • a coating device according to FIG. 1 was provided with curtain holders according to FIG. 5 and used for a coating with 3 layers.
  • a PE-coated paper with an adhesive layer of 230 ⁇ m thickness was coated.
  • the casting quality and the curtain stability were very good and the edge bead thickness was very small.
  • the layer width generated by the curtain itself on the web corresponded exactly to the width of the layers running off at the coating edge.
  • a coating device according to FIG. 1 was provided with curtain holders according to FIG. 5 and used for a coating with two layers.
  • a PE-coated paper 230 ⁇ m thick was coated.
  • the coating width was 13.9 cm.
  • the casting quality and the curtain stability were very good.
  • the layer width on the track corresponded to the width of the layer package on the foundry sliding surface.
  • a coating device according to FIG. 1 was provided with curtain holders according to FIG. 5 and used for a coating with 3 layers.
  • a PE-coated paper 230 ⁇ m thick was coated.
  • a coating device according to FIG. 1 was provided with curtain holders according to FIG. 5 and used for a coating with 3 layers.
  • a PE-coated paper 230 ⁇ m thick was coated.
  • a coating device according to FIG. 1 was provided with curtain holders according to FIG. 5 and used for a coating with 3 layers.
  • a PE-coated paper 230 ⁇ m thick was coated.
  • the coating width was 13.9 cm.
  • a coating device according to FIG. 1 was provided with curtain holders according to FIG. 5 and used for a coating with 5 layers.
  • a PE-coated paper with an adhesive layer of 230 ⁇ m thickness was coated.
  • the coating width was 13.9 cm.
  • the dosage in the curtain holder was increased to 1.6 l / m min.
  • the curtain was very stable and the edge bead was low.
  • the casting quality was good and the width of the layer package placed on the web corresponded exactly to the width of the layers running off at the coating edge.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Coating Apparatus (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Claims (12)

1. Procédé de stabilisation de voiles de fluides à chute libre avec une ou plusieurs couches lors du revêtement, selon le procédé de revêtement par voiles, de nappes ou d'objets défilant en continu en regard d'une zone de revêtement, caractérisé par le fait que, pour guider latéralement le voile (4) en chute libre qui se forme sur le bord de revêtement (3) du dispositif de revêtement, on utilise des supports (9) de voiles desquels sort un fluide supplémentaire (11) qui est dirigé vers le voile (4), se combine à ce voile (4) et forme sur le substrat (5) de couches, du bord de revêtement (3) jusqu'à la rencontre avec le voile (4), des ponts triangulaires stabilisateurs (14) de fluide entre le voile (4) et les supports (9) de voiles.
2. Procédé selon la revendication 1, caractérisé par le fait que le dosage de la quantité de fluide, introduite dans les supports (9) de voiles assurant le guidage latéral du voile (4), est choisi de telle sorte que les ponts (14) de fluide commencent directement sur le bord de revêtement (3), s'elargissent triangulairement dans la direction de chute du voile (4) et permettent une contraction du voile (4) en chute libre, qui stabilise ce dernier.
3. Procédé selon la revendication 1, caractérisé par le fait que, pour engendrer les ponts (14) de fluide entre le voile (4) et les supports latéraux (9) de voiles, on utilise des fluides (11) à faible viscosité, dont les viscosités sont comprises entre 1 mPa.s et 20 mPa.s, de préférence entre 1 mPa.s et 10 mPa.s.
4. Procédé selon la revendication 1, caractérisé par le fait que la largeur du voile (4) et la quantité dosée du fluide (11) sortant des supports (9) de voiles sont choisies de telle sorte que le substrat (5) de couches soit revêtu de fluide de revêtement jusqu'à proximité immédiate de ses bords, et que le fluide (11) sortant latéralement des supports (9) de voiles assure l'imprégnation des bords du substrat (5) de couches, pour être ensuite recueilli et réutilisé dans la mesure où ce fluide (11) ne rencontre pas la nappe (5).
5. Procédé selon la revendication 1, caractérisé par le fait que la largeur du voile (4) et la quantité dosée du fluide (11) sortant des supports (9) de voiles sont choisies de telle sorte que le substrat (5) de couches soit revêtu de fluide de revêtement jusqu'au bord et que, à cette fin, le fluide (11) sortant latéralement des supports (9) de voiles, ainsi qu'une faible partie du fluide de revêtement, ne rencontrent pas le substrat (5) de couches et soient recueillis.
6. Procédé selon la revendication 1, caractérisé par le fait que la position précise et la forme des bords du matériau de revêtement, sur le substrat (5) de couches, sont ajustées par l'intermédiaire de l'angle a formé par les supports (9) de voiles avec la verticale, ainsi que de la quantité et de la nature du fluide auxiliaire (11).
7. Appareil de revêtement par voiles muni d'un dispositif de stabilisation du voile à chute libre, en vue du revêtement simple ou multiple de nappes ou d'objets défilant en continu en regard d'une zone de revêtement, caractérisé par le fait que des supports (9) de voiles, intérieurement creux, intercalés entre le bord de revêtement (3) du dispositif de revêtement et la nappe (5), en vue du guidage latéral de part et d'autre du voile (4), sont pourvus d'une admission séparée (10) de fluide et, sur toute leur hauteur, d'un canal répartiteur (12) et d'un dispositif (13, 20, 21) pour délivrer le fluide auxiliaire (11) en direction du voile (4), en vue de la formation de ponts (14) de fluide entre le voile (4) et les supports (9) de voiles.
8. Appareil de revêtement par voiles selon la revendication 7, caractérisé par le fait que les supports (9) de voiles consistent en des corps creux fermés en partie haute et en partie basse, qui sont raccordés à un dispositif (10) d'admission de fluide dont l'espace interne sert de canal répartiteur (12) pour le fluide auxiliaire (11); et par le fait que, pour former les ponts (14) de fluide, les corps creux tubulaires sont munis, en direction du voile (4), d'une fente (13) faisant fonction de dispositif de délivrance du fluide auxiliaire (11).
9. Appareil de revêtement par voiles selon la revendication 7, caractérisé par le fait que les supports (9) de voiles consistent en des corps creux tubulaires fermés en partie haute et en partie basse, qui sont fabriqués en un matériau poreux (20) perméable aux fluides, sont équipés d'un dispositif (10) d'admission de fluide et sont garnis, sur toute leur surface, d'une couche de fluide (11) en vue de la formation des ponts (14) de fluide.
10. Appareil de revêtement par voiles selon la revendication 7, caractérisé par le fait que les supports (9) de voiles consistent en des corps creux fermés en partie haute et en partie basse, dotés d'un dispositif (10) d'admission de fluide et munis, en direction du voile (4), d'une fente (13) faisant office de dispositif de délivrance, cette fente (13) étant pourvue d'un matériau poreux (21) perméable aux fluides.
11. Appareil de revêtement par voiles selon la revendication 7, caractérisé par le fait que les supports (9) de voiles sont intimement juxtaposés au bord de revêtement (3) du dispositif de revêtement, de telle sorte que les ponts (14) de fluide commencent directement sur ce bord de revêtement (3); et par le fait que, dans le plan du voile (4) de fluide en chute libre verticale, les supports (9) de voiles peuvent pivoter en direction du voile (4) d'un angle + a, et d'un angle - a, à l'écart de ce voile (4), l'angle pouvant être réglé de α - 10° à + 10°, de préférence de - 5° à 0°.
12. Appareil de revêtement par voiles selon la revendication 7, caractérisé par le fait que, pour choisir la largeur (b) des ponts (14) de fluide dans la zone d'impact du voile (4) sur le substrat (5) de couches, la quantité de fluide introduite de manière dosée dans les supports (9) de voiles est ajustable, de sorte que des ponts triangulaires (14) de fluide plus ou moins grands se forment des deux côtés du voile en fonction de la quantité de fluide à introduction dosée, ce qui permet d'ajuster la position du bourrelet marginal du revêtement (6) et la largeur de ce revêtement.
EP83113019A 1983-01-04 1983-12-23 Procédé et appareil pour la stabilisation de rideaux liquides en chute libre Expired EP0115621B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19833300150 DE3300150A1 (de) 1983-01-04 1983-01-04 Verfahren und vorrichtung zur stabilisierung von frei fallenden fluessigkeitsvorhaengen
DE3300150 1983-01-04

Publications (3)

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EP0115621A2 EP0115621A2 (fr) 1984-08-15
EP0115621A3 EP0115621A3 (en) 1985-10-23
EP0115621B1 true EP0115621B1 (fr) 1987-02-04

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US (1) US4479987A (fr)
EP (1) EP0115621B1 (fr)
JP (1) JPS59132966A (fr)
DE (2) DE3300150A1 (fr)

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Also Published As

Publication number Publication date
DE3300150A1 (de) 1984-07-05
EP0115621A3 (en) 1985-10-23
JPS59132966A (ja) 1984-07-31
DE3369743D1 (en) 1987-03-12
EP0115621A2 (fr) 1984-08-15
US4479987A (en) 1984-10-30

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