EP0017126B1 - Procédé et dispositif de dépôt simultané de plusieurs couches sur des objets en mouvement, plus particulièrement des bandes, par couler d'un rideau en chute libre du materian à deposer - Google Patents

Procédé et dispositif de dépôt simultané de plusieurs couches sur des objets en mouvement, plus particulièrement des bandes, par couler d'un rideau en chute libre du materian à deposer Download PDF

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Publication number
EP0017126B1
EP0017126B1 EP80101544A EP80101544A EP0017126B1 EP 0017126 B1 EP0017126 B1 EP 0017126B1 EP 80101544 A EP80101544 A EP 80101544A EP 80101544 A EP80101544 A EP 80101544A EP 0017126 B1 EP0017126 B1 EP 0017126B1
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EP
European Patent Office
Prior art keywords
curtain
coating materials
sliding surfaces
coating
shaped
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
EP80101544A
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German (de)
English (en)
Other versions
EP0017126A1 (fr
Inventor
Günther Dr. Koepke
Hans Dipl.-Ing. Frenken
Heinrich Dipl.-Ing. Bussmann
Kurt Browatzki
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Agfa Gevaert AG
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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 EP0017126A1 publication Critical patent/EP0017126A1/fr
Application granted granted Critical
Publication of EP0017126B1 publication Critical patent/EP0017126B1/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
    • B05C5/005—Curtain coaters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C5/00—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
    • B05C5/007—Slide-hopper coaters, i.e. apparatus in which the liquid or other fluent material flows freely on an inclined surface before contacting the work
    • B05C5/008—Slide-hopper curtain coaters
    • 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
    • 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
    • G03C2001/7466—Geometry and shape of application devices
    • 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
    • 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
    • Y10S430/00—Radiation imagery chemistry: process, composition, or product thereof
    • Y10S430/136—Coating process making radiation sensitive element

Definitions

  • the invention relates to a method and a device for the simultaneous application of several layers of liquid coating materials onto objects or webs of layer support materials continuously carried past the application point, in particular for the production of photographic materials, with application devices according to the curtain casting method.
  • the cascade pouring process which is common in the photographic industry includes the cascade pouring process, in which one or more liquid coating materials flow downwards simultaneously on an inclined sliding surface and onto them over a small distance (0.15-0.3 mm) between the casting edge and the moving web Web are applied.
  • the so-called curtain casting process has been gaining in importance for the photographic industry for some time.
  • Two process variants are known for the curtain casting method, namely the so-called slot caster and the so-called beak caster or sliding surface caster working on the principle of the cascade caster.
  • the coating material emerges at the lower end of an outflow gap arranged transversely above the web to be coated, and there directly forms a free-falling curtain.
  • the coating material is pressed through an outlet slit onto an inclined sliding surface, then flows downward under the force of gravity on the sliding surface, which is curved or beak-shaped at the lower end, and only forms at the lower end of the beak when leaving it the free-falling curtain.
  • the liquid curtain can consist of one or more layers.
  • the first cascade pouring process is limited in its application and has a number of disadvantages. It is also not suitable for casting individual objects, since their edges would interfere with the casting process.
  • the coating leaving the casting device forms. material on the inlet side of the web, a meniscus that is sucked in more or less deeply into the space between the caster edge and the web, depending on the vacuum used to support the job.
  • the coating material is not exchanged in this meniscus at the foundry edge, so that partial hardening or thickening occurs due to evaporation of the volatile components.
  • This also leads to the well-known pencil lines. An uneven wetting line has the same consequences.
  • the pouring rate is subject to an upper limit which depends on the number of layers, the metered amounts and the viscosities of the coating materials.
  • the curtain casting system with slot caster is limited to two-layer castings.
  • the slot caster is difficult to deaerate when filling with coating material, so that bubbles lead to faults in the cast layer during the manufacturing process.
  • the two surfaces of the curtain have different surface tensions because one surface is always in contact with the atmosphere for longer, namely the layer facing away from the sliding surface. Since the surface forces are unequal, this can lead to instabilities in the curtain.
  • the surface-active additives to the coating material also act differently depending on the medium with which they are associated. In the slot caster, both surfaces are exposed to the atmosphere during curtain formation at the same time. With the beak caster, one surface is in contact with the atmosphere longer than the other.
  • a casting system which contains a combination of two beak caster.
  • Each of the two spout founders produces up to two liquid films, the one with the Liquid films of the other beak caster brought together to form a curtain falling vertically on the web to be poured.
  • the casting system contains a third assembly consisting of a prismatic body, the cross section of which is an equilateral triangle.
  • a longitudinal edge of the prismatic body, the so-called drainage edge lies above the gap formed by the two spout lips.
  • a layer of liquid pouring material flows over each of the two surfaces forming the drainage edge of the body. The two layers form a double layer at the edge of the drain, which falls as a curtain between the layers supplied by the two spout founders and combines to form a multiple layer, which then falls as a free-falling curtain onto the web to be coated.
  • a multiple layer is applied here by means of a relatively complicated system, the casting system, on the one hand, having all of the above-mentioned disadvantages of the known beak caster. Furthermore, 3 casters are required for only 5 layers, which cause considerable difficulties in operation and require a high level of production effort.
  • the intermediate casting of two layers in two layers poses a considerable risk of air trapping in the middle of the layers.
  • the mistakes mentioned in the beak caster such as pencil lines due to dust deposits, evaporation residues and uneven wetting lines occur on the front and back of the curtain.
  • the invention has for its object to provide a simplified method and a device for the simultaneous application of several layers of liquid coating materials on objects, in particular tapes as a substrate, which enable a simple compact assembly and excludes the above-mentioned disadvantages of the known methods and devices.
  • the object was achieved in that in a single application device over the width of V-shaped sliding surfaces or above arranged subsequent V-shaped vertical or roof-shaped sliding surfaces, more than two liquid coating materials emerge, the two V-shaped sliding surfaces, which are above the coated objects or form a trailing edge, are fed, hang down on the V-shaped sliding surfaces, unite at the end of the sliding surfaces in the trailing edge to form a multilayer liquid film and the multilayer film as a free-falling and laterally guided curtain directly on the objects or the web of Layer support material is stored.
  • the process is characterized in that the liquid coating materials emerge from two further vertical or roof-shaped inclined sliding surfaces, flow to the V-shaped sliding surfaces and hang over them to the drainage edge and form a common curtain at the drainage edge.
  • the curtain formed by the method of the invention has high stability.
  • the coating materials come together, the layers are not mixed, and there are no casting streaks, which was not to be expected for the person skilled in the art.
  • the curtain is guided laterally during the free fall and is protected from air movements from the room and from entrained air of the web during the free fall and when hitting the layer support.
  • the invention further relates to a device for carrying out the method according to the invention with an application device arranged above the continuously moving objects to be coated or layer supports for producing a multilayer curtain, which is characterized in that two are brought together to bring together more than two liquid coating materials to form a common trailing edge V-shaped sliding surfaces are provided at the angles oc 3 and x 4 to the horizontal and that at least one chamber-shaped feed channel with outlet slots for the liquid coating materials is provided on or above both sides of the V-shaped sliding surfaces.
  • One embodiment of the device is characterized in that the application device consists of at least one V-shaped body extending across the casting width with V-shaped sliding surfaces and with a run-off edge and of feed bodies for receiving 3 to 6 or more chamber-shaped feed channels and slots is composed for the liquid coating materials.
  • a preferred embodiment of the device has feed bodies for the coating materials with vertical sliding surfaces for feeding the liquid coating materials to the V-shaped sliding surface, the outlet slots being arranged horizontally.
  • a further device is characterized in that the supply body for Be istungsmate- r ialien roof-shaped inclined sliding surfaces for delivering the liquid coating materials to the V-shaped sliding surface has discharge slots and extend the rising. This considerably facilitates venting of the slots, so that no disturbing air bubbles occur.
  • the feed bodies for the coating materials are designed such that, on the one hand, a less inclined roof-shaped There is a sliding surface for the exit and for superimposition of the coating materials and a central feed body has a curved sliding surface which converts from the roof-shaped inclination to the vertical, which is connected on one side of the V-shaped body to the V-shaped sliding surface and on the other hand at least one feed channel and Exit slot is provided which supplies at least one further liquid coating material to the other sliding surface of the V-shaped body.
  • This device has the advantage of a cascade drainage surface for any number of coating liquids and the formation of curtains at a drainage edge, which is completely sealed off from the atmosphere by a further layer of a coating material.
  • a simple device for a large number of layers is obtained in that the entire application device is V-shaped and the outlet slots are arranged horizontally in the V-shaped sliding surfaces.
  • An advantageous and very versatile device is obtained in that the entire application device for adjusting the fall height a of the curtain can be adjusted in a vertical direction in a range of approximately 1 cm to 20 cm above the coating surface 1.
  • the swiveling of the application device around the drainage edge allows the casting quality to be optimized by changing and adapting the run-off areas of the entire application device.
  • the device is advantageously set up in such a way that the material to be coated, the layer support, is supported at the point of impact of the curtain by suitable means, preferably by a roller. In this way, the layer carrier runs smoothly at this point and unevenness in the applied layers is avoided.
  • the improvement in the stability of the curtain was also unexpected, which is probably due to the symmetry of the flow conditions at the coating edge and the relatively long time contact of both surfaces of the coating materials with the atmosphere.
  • the surface-active additives of the coating materials have sufficient time to accumulate in the two surfaces and thus to reduce the surface tensions.
  • the methods and devices of the invention bring significant technical progress.
  • the yield on the pouring machines is improved because, due to the more stable curtain, interruptions in production by tearing the curtain are avoided.
  • the elimination of drain lips avoids the relatively high losses caused by this as a result of hardening of the casting material, dirt deposits, thickening and uneven wetting.
  • Particular economy is achieved in that high numbers of layers can be applied in one pass. Further advantages of the invention are expressed in that the construction of the foundry is very simple and compact and that it is uncomplicated to use.
  • the caster consists of blocks 7 and 12, which are screwed together and delimited by end plates. The end plates and the fastening devices of the caster on a frame are not shown.
  • the liquid coating materials 11 are fed into the feed channels 8 with the aid of known metering devices and lines (not described here in greater detail) from one end face.
  • the feed channels 8, which can also be designed in several stages, in conjunction with the subsequent outlet slots 9 1 - 6 ensure a uniform distribution of the coating materials in the casting width.
  • the feed channels 8 can, just as in the known casters, be equipped with distributor pipes and / or with feed channels dimensioned differently across the width.
  • the coating materials from the outlet slots 9 flow downwards on the vertical surfaces and lie over the coating materials already flowing downwards from the deeper slots. Finally, they are deflected to the sliding surfaces 5, which are negatively inclined at the angles ⁇ »and M4, and flow in a hanging manner to the drainage edge 4, where they form a common curtain 3.
  • the curtain 3 is held at its two edges by curtain guides not shown here.
  • the sprue width can be set up for any practical web width.
  • the elimination of the drain lips has a favorable effect, particularly for wide webs, since the greater the width of the pouring point, the greater the likelihood that there will be a drain lip at one or more locations Beak caster malfunctions of the type described above arise.
  • the curtain 3 is formed and, after the drop a, meets the layer support 1 which has moved past and coats it over its entire width, the excess of casting material at the edges being able to be drained off by collecting trays. This creates webs without an edge section.
  • the layer support 1 is only coated almost to the web edges, the curtain 3, as known and already mentioned, being guided through curtain guide elements reaching almost to the moving layer support 1 and thus being prevented from contracting by surface tensions. In this way, less valuable coating material is lost, the cast layer support 1 is then not cast over the full width and must be trimmed, the uncast edges being cut off.
  • An essential feature of the invention is the V-shaped body 7 with its V-shaped sliding surfaces 5, which meet in the drainage edge 4. On these sliding surfaces 5, the liquid coating materials 11 hang down on both sides and unite at the trailing edge 4 to form a curtain 3.
  • liquid coating materials flowing off at 90 ° from the vertical sliding surface 10 do not show any faults, mixing, or detachment phenomena when they suddenly change from a higher speed on the vertical sliding surfaces 10 to a slower speed on the V-shaped sliding surfaces 5 can be reduced, although the layer thicknesses then increase.
  • a particularly stable curtain 3 is achieved by the coating materials 11 flowing together at the edge 4.
  • V (a) which essentially depends on the drop height a until it hits the layer support 1. Since only laminar flows occur in the entire process, there is no mixing of the individual layers either in free fall or when the curtain hits the substrate.
  • the layer support 1 can be moved within certain limits at a slower speed than the speed V (a) at which the curtain 3 strikes, which results in a thickening of the applied layers 2, or at the same speed with the same layer thickness of the curtain at the point of impact and train.
  • the entire application device is provided with a transparent hood against drafts, as is generally known from curtain casting technology.
  • a rapidly moving layer support 1 moves air along with its surface, which can cause disturbances due to air pockets at the point of impact of the curtain 3 on the layer support 1. It is known to provide baffles or suction and deflection over the web to largely eliminate these disturbances.
  • the method of the invention can be used for coating glass, wood or fabrics. Instead of coherent webs, layers in the form of sheets or foils can also be coated.
  • the method and the devices are particularly suitable for casting photographic supports with photographic emulsions.
  • all customary sheet-like materials can be used as layer supports for the production of photographic materials. Examples of such supports include films made from cellulose nitrate, ceilulose triacetate, polyvinyl acetate, polycarbonate, polyethylene terephthalate, polystyrene and the like. Like. As well as various papers with or without coatings called.
  • photographic layers containing silver halides as photosensitive compounds can be applied in the photo industry.
  • the method can also be used to produce layers containing photosensitive dyes or photoconductive zinc oxide or titanium dioxide.
  • the layers can also contain other additives as are known in the field of photographic layer production, e.g. As carbon black, matting agents such as silicon dioxide, or polymer development aids, mordants and the like. The like.
  • Photographic layers can also contain various hydrophilic colloids as binders. Examples of such colloids are, in addition to proteins such as gelatin, cellulose derivatives, polysaccharides such as starch, sugar, dextran or agar. Further synthetic polymers, such as polyvinyl alcohol or polyacrylamide or mixtures of such binders.
  • the coating method of the invention is of course also applicable for the production of non-photographic layers, such as. B. magnetic tone layers or other layers of paint or lacquer.
  • FIG. 2 shows a modification of FIG. 1, the vertical sliding surfaces 10 being replaced by roof-shaped sliding surfaces 13.
  • the angles ⁇ 1 and ⁇ 2 are no longer 90 °, but are smaller, and are between 60 ° and 90 ', preferably around 80 °.
  • the outlet slots 9 are directed upwards (angle ⁇ > 90 °), as a result of which better ventilation of the feed channels 8 and the outlet slots 9 is achieved, since the air is better displaced by the liquid during startup.
  • the flow conditions on the roof-shaped sliding surfaces 13 are more favorable.
  • the deflection of the coating liquids 11 takes place continuously via curved surfaces from the inclined roof-shaped sliding surfaces 13 into the V-shaped sliding surfaces 5, as a result of which there is a continuous change in speed.
  • FIG. 3 shows an embodiment in which the flow behavior of the liquid coating materials in cascade casting and the inventive curtain formation are combined. Essentially all layers are formed on the cascade-shaped sliding surface 13 and on the other side only one or more of the layers 14 are fed to the drainage edge 4.
  • the roof-shaped sliding surface 13 forms an angle a 2 of 15 ° to 60 ° in the cascade casters. It is of course also possible to use larger angles 0C2 to 90 °, as a result of which this exemplary embodiment would merge with that of FIG. 1 with the difference that the number of layers for the V-shaped sliding surfaces is unequal. This is also within the scope of the invention.
  • the angles of the V-shaped body 7 need not be the same for the sliding surfaces 5.
  • the angle x3 can be 30 ° to 90 ° and a 4 approximately 45 ° to 60 °.
  • this application device permits the simultaneous casting of many layers, but does not have their disadvantages.
  • FIG. 4 shows an application device with only negatively inclined surfaces. It can be used for the application of up to 4 layers.
  • the blocks 7 are relatively easy to manufacture and the caster is very compact.
  • the coating materials 11 are fed on the end face and, as shown in FIG. 1, distributed over the casting width with the aid of the feed channels 8 and the outlet slots 9.
  • FIG. 1 shows a front view of the application device according to FIG. 1.
  • the application device is arranged at a distance a above the layer support 1 and has the width b, which can be wider, the same or narrower than the layer support.
  • the liquid coating materials 11 emerge from the outlet slots 9 onto the sliding surface 10, flow off and are superimposed on one another.
  • edge strips 18 are attached to the sliding surfaces 10 and 5 on both sides, to which the film is applied by surface tension.
  • the liquid film visible here reaches the drainage edge 4 and combines with the liquid film coming from the rear sliding surface, which is not visible, to form a curtain 3, which falls over the distance a onto the layer support 1 and onto this as layer 2 is put on.
  • lateral guides 19 are provided in a known manner.
  • the layer support is supported by a roller 6 at the point of impact of the curtain 3.
  • the application device can be moved up and down vertically, as shown by the double arrow, in order to be able to set an optimal drop height a for the curtain 3.
  • the fall height a influences the curtain thickness on impact and the impact speed. This is essential to the kinetic Energy of the falling curtain pushing the air away above the substrate and avoiding air pockets between layers 2 and substrate 1.
  • the casting dates are listed in the following table:
  • the quality of the casting was satisfactory.
  • the curtain did not show very stable behavior and tends to bend across the width.
  • the pourer according to FIG. 1 was used for a two-layer pouring.
  • the casting quality was good.
  • the curtain is stable and calm.
  • the caster according to Figure 1 was used for a 4-layer pouring.
  • the casting quality was good.
  • the curtain was very stable.
  • the caster according to FIG. 1 was used for a 6-layer casting.
  • the casting quality was good.
  • a microphotograph of a cross section through the dried coating showed a very good separation between the layers.
  • the curtain was very stable.
  • the pourer according to FIG. 4 was used for a two-layer pouring.
  • the casting quality was good.
  • the curtain was stable.
  • the pourer according to FIG. 4 was used for a 3-layer casting.
  • the casting quality was good.
  • the curtain was stable.
  • the pourer according to FIG. 1 was used for a two-layer pouring.
  • the casting quality was good.
  • the curtain was stable.
  • the caster according to Figure 1 was used for a 3-layer pouring.
  • the casting quality was good.
  • the curtain showed stable calm behavior.
  • the pourer according to FIG. 1 was used for a two-layer pouring.
  • the casting quality was good.
  • the curtain was calm and stable.
  • the caster according to Figure 1 was used for a 3-layer pouring.
  • the casting quality was good.
  • the separation between the layers was very good, as a cross section through the dried coating showed.
  • the curtain was stable.
  • the pourer according to FIG. 1 was used for a two-layer pouring.
  • the casting quality was good.
  • the curtain was stable.

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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 (9)

1. Procédé de coulée en rideau pour l'application simultanée de plusieurs couches de matières d'enduction liquides sur des articles ou des bandes de matières supports de couches défilant continuellement devant le poste d'application, en particulier, pour la fabrication d'éléments photographiques, caractérisé en ce que, dans un seul dispositif applicateur, sur la largeur de surfaces de glissement en V ou de surfaces ultérieures de glissement en V disposées au-dessus des surfaces de glissement précitées, verticalement ou en forme de toit, sortent plus de deux matières d'enduction liquides qui sont acheminées aux deux surfaces de glissement disposées en V et formant un bord d'écoulement au-dessus de la bande ou des articles à enduire, ces matières d'enduction s'écouiant en position suspendue sur les surfaces de glissement en V à l'extrémité desquelles elles se réunissent, au bord d'écoulement, en une pellicule liquide à plusieurs couches, cette pellicule venant se poser directement sous forme d'un rideau tombant librement et guidé latéralement, sur les articles ou la bande de la matière support de couches.
2. Procédé suivant la revendication 1, caractérisé en ce que, pendant sa chute libre et lors de son impact, le rideau est protégé contre les mouvements de l'air.
3. Dispositif pour la réalisation du procédé suivant les revendications 1 et 2, ce dispositif comportant un dispositif applicateur installé au-dessus des supports de couches ou des articles à enduire se déplaçant continuellement, afin de former un rideau à plusieurs couches, caractérisé en ce que, pour acheminer ensemble plus de deux matières d'enduction liquides (11) à un bord d'écoulement commun (4), on prévoit deux surfaces de glissement (5) disposées en V sous des angles «3 et <X4 par rapport à l'horizontale tandis que, sur ou au-dessus des deux côtés des surfaces de glissement en V (5), on prévoit au moins chaque fois un canal d'alimentation en forme de chambre (8) comportant des fentes de sortie (9) pour les matières d'enduction liquides (11).
4. Dispositif suivant la revendication 3, caractérisé en ce que le dispositif applicateur est constitué d'un corps en V (7) s'étendant sur la largeur de coulée et comportant des surfaces de glissement en V (5) et un bord d'écoulement (4), ainsi que de corps d'alimentation (12) destinés à recevoir trois à six canaux d'alimentation en forme de chambres (8) ou plus avec des fentes de sortie (9) pour les matières d'enduction lequides (11).
5. Dispositif suivant la revendication 6, caractérisé en ce que les corps d'alimentation pour les matières d'enduction (12) comportent des surfaces de glissement verticales (10) afin d'acheminer ces matières d'enduction liquides (11) aux surfaces de glissement en V(5), tandis que les fentes de sortie (9) sont disposées horizontalement (p = 90°).
6. Dispositif suivant la revendication 4, caractérisé en ce que les corps d'alimentation pour les matières d'enduction (12) comportent des surfaces de glissement (13) inclinées en forme de toit (α1 et α2 < 90°) afin d'acheminer les matières d'enduction liquides (11) aux surfaces de glissement en V (5), les fentes de sortie (S) s'étendant en une pente ascendante (β > 90°).
7. Dispositif suivant la revendication 4, caractérisé en ce que les corps d'alimentation pour les matières d'enduction (11) sont réalisés de teile sorte qu'il y ait une surface de glissement inclinée en forme de toit (13) pour la sortie et la superposition des matières d'enduction (11), tandis qu'un corps d'alimentation central (12) comporte une surface de glissement courbe passant de la position inclinée en forme de toit (13) dans la position verticale (10), cette surface de glissement étant reliée, d'un côté du corps en V, à la surface de glissement en V (5), et l'on prévoit au moins un canal d'alimentation (8) et une fente de sortie (9) afin d'acheminer au moins une autre matière d'enduction liquide (14) à l'autre surface de glissement (5) du corps en V.
8. Dispositif suivant les revendications 3 à 7, caractérisé en ce que, afin de régler la hauteur de chute (a) du rideau (3), tout le dispositif applicateur peut être déplacé verticalement sur une distance d'environ 1 à 20 cm au-dessus de la surface d'enduction (1 ).
9. Dispositif suivant les revendications 3 à 7, caractérisé en ce que, afin d'optimaliser la qualité de la coulée, tout le dispositif applicateur peut pivoter sur le bord d'écoulement (4).
EP80101544A 1979-04-03 1980-03-24 Procédé et dispositif de dépôt simultané de plusieurs couches sur des objets en mouvement, plus particulièrement des bandes, par couler d'un rideau en chute libre du materian à deposer Expired EP0017126B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2913217 1979-04-03
DE19792913217 DE2913217A1 (de) 1979-04-03 1979-04-03 Verfahren und vorrichtung zum gleichzeitigen auftragen mehrerer schichten auf bewegte gegenstaende insbesondere bahnen

Publications (2)

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EP0017126A1 EP0017126A1 (fr) 1980-10-15
EP0017126B1 true EP0017126B1 (fr) 1982-02-17

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EP80101544A Expired EP0017126B1 (fr) 1979-04-03 1980-03-24 Procédé et dispositif de dépôt simultané de plusieurs couches sur des objets en mouvement, plus particulièrement des bandes, par couler d'un rideau en chute libre du materian à deposer

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US (1) US4384015A (fr)
EP (1) EP0017126B1 (fr)
JP (1) JPS55134668A (fr)
DE (2) DE2913217A1 (fr)

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Also Published As

Publication number Publication date
DE2913217A1 (de) 1980-10-23
US4384015A (en) 1983-05-17
DE3060196D1 (en) 1982-03-25
EP0017126A1 (fr) 1980-10-15
JPS635151B2 (fr) 1988-02-02
JPS55134668A (en) 1980-10-20

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