EP1895051B1 - Procédé de revêtement en rideau et dispositif correspondant - Google Patents

Procédé de revêtement en rideau et dispositif correspondant Download PDF

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Publication number
EP1895051B1
EP1895051B1 EP06018364A EP06018364A EP1895051B1 EP 1895051 B1 EP1895051 B1 EP 1895051B1 EP 06018364 A EP06018364 A EP 06018364A EP 06018364 A EP06018364 A EP 06018364A EP 1895051 B1 EP1895051 B1 EP 1895051B1
Authority
EP
European Patent Office
Prior art keywords
carrier web
curtain
movement
coating
heat
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.)
Not-in-force
Application number
EP06018364A
Other languages
German (de)
English (en)
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EP1895051A1 (fr
Inventor
Christian Elsner
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.)
Mitsubishi HiTec Paper Bielefeld GmbH
Original Assignee
Mitsubishi HiTec Paper Bielefeld 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 Mitsubishi HiTec Paper Bielefeld GmbH filed Critical Mitsubishi HiTec Paper Bielefeld GmbH
Priority to DE502006003618T priority Critical patent/DE502006003618D1/de
Priority to AT06018364T priority patent/ATE430217T1/de
Priority to EP06018364A priority patent/EP1895051B1/fr
Priority to CN2007800369527A priority patent/CN101522990B/zh
Priority to US12/083,656 priority patent/US7939140B2/en
Priority to PCT/EP2007/007411 priority patent/WO2008025479A2/fr
Publication of EP1895051A1 publication Critical patent/EP1895051A1/fr
Application granted granted Critical
Publication of EP1895051B1 publication Critical patent/EP1895051B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
    • D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
    • D21H23/22—Addition to the formed paper
    • D21H23/46—Pouring or allowing the fluid to flow in a continuous stream on to the surface, the entire stream being carried away by the paper
    • D21H23/48—Curtain coaters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C5/00—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
    • B05C5/005—Curtain coaters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
    • B41M5/30—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used using chemical colour formers
    • B41M5/333—Colour developing components therefor, e.g. acidic compounds
    • B41M5/3333—Non-macromolecular compounds
    • B41M5/3335—Compounds containing phenolic or carboxylic acid groups or metal salts thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
    • B41M5/30—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used using chemical colour formers
    • B41M5/333—Colour developing components therefor, e.g. acidic compounds
    • B41M5/3333—Non-macromolecular compounds
    • B41M5/3335—Compounds containing phenolic or carboxylic acid groups or metal salts thereof
    • B41M5/3336—Sulfur compounds, e.g. sulfones, sulfides, sulfonamides
    • 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 present invention relates to a method and to a device used therefor for single or multiple coating of a continuously moving carrier web with a liquid coating material according to the curtain coating method, wherein a free-falling, vertical curtain is formed from the coating material, which meets the carrier web along a wetting line ,
  • the present invention relates to a method for producing a heat-sensitive recording material.
  • Vofiang coating processes are almost indispensable in modern day paper production facilities.
  • the curtain coating processes for the production of photographic papers and magnetic recording papers are used, but are also increasingly other applications for the curtain coating process, for example, for the production of heat and pressure sensitive recording materials, ink jet receiving media and pigment coated recording materials as a recognized state of the art.
  • the so-called slot casters in which the liquid coating material exits through an outlet gap arranged transversely over the web-shaped carrier material to be coated, where it directly forms the free-falling liquid curtain
  • the so-called Gleit vomg teller the so-called Gleit vomgilloner.
  • the liquid coating material is first applied to a downwardly inclined sliding surface, where the liquid flows in a thin film under the influence of gravity down the sliding surface and forms at the end of the free-falling liquid curtain.
  • wetting line is to be understood as the cross-over the path of the carrier material, ideally static and rectilinear cutting axis of the liquid curtain with the continuously moving carrier web. Coating defects such as an uneven thickness of the applied coating material and production disruptions due to completely or even partially tearing liquid curtains are typical consequences of severe wetting line distortions.
  • a web to be coated by a curtain coating method is directed slightly downwardly between two guide rolls located in front of and behind the wetting line by a knife positioned some distance in front of the wetting line.
  • the knife forms an airtight shield for the air entrained by the material web to the liquid curtain and is thus intended to prevent the disturbing influences of the oriented in the direction of the liquid curtain air movements sustainable.
  • Another embodiment provides a hollow, open at the bottom knife, with the additional air can be sucked.
  • a very thin coating film is applied to a very fast and continuous moving carrier web.
  • the liquid coating material is released from the outlet slot of the slot caster or, without being limited in any way, from the sliding surface of the slide surface caster, the actual curtain is formed from the coating material and moves perpendicularly under the influence of gravity falls down.
  • the vertical movement of this coating material is deflected in a movement corresponding to the direction of movement of the carrier web behind the wetting line and preferably slightly increasing in the sense of the invention.
  • the carrier web in the wetting line it comes at very high speeds of the carrier web that located under the impinging curtain carrier web surface sometimes moves faster in a vertical direction downwards than the coating material can fall in the curtain.
  • the coating material is a functional coating slip, as known, for example, as a heat-sensitive coating slip, and which are considered preferred in the context of the present application, the function of the coating film at the defects is considerably impaired: the recording material thus produced is unusable.
  • This air cushion prevents effective fixing of the carrier web on the guide rollers and can even cause a stimulation of the carrier web to micro vibrations by a non-uniform air flow, for example, as a result of slight surface irregularities of the guide rollers and / or the underside of the carrier web.
  • too little force is built up on the outlet side in order to press the carrier web onto the guide rolls.
  • round element (6) in the context of the present invention can serve a round bent, statistically positioned workpiece, for example made of sheet metal. It is considered to be particularly advantageous to form the round element (6) and the air guide (7) in one piece and / or form-fitting.
  • the round element (6) is preferably a metering rod, wherein it is then considered to be particularly advantageous to design the air guiding means (7) as a round element holder or as a doctor bar holder.
  • the metering rod does not rotate during operation or it rotates in relation to the direction of movement of the carrier web (1), which means that the surface movement of the metering rod in the contact area with the carrier web (1 ) is aligned with the direction of movement of the carrier web (1), or it rotates in relation to the direction of movement of the carrier web (1) in opposite directions.
  • the diameter of the metering rod is preferably in a range of 9 mm to 16 mm, very particularly preferably in a range of 13 to 14 mm
  • the rotation direction of the metering rod can have an influence on the micro-vibrations of the carrier web.
  • a counter-rotating doctor bar particularly effectively prevents the buildup of an air cushion between the doctor bar and carrier web, at the same time has a positively rotating metering rod reduced to almost zero friction between doctor bar and carrier web positively to the running behavior of the carrier web.
  • the metering rod is not wound, that is, it is smooth.
  • the round element (6) has a slight pre-bend in the direction of the underside of the carrier web (1). If the round element (6) is present as a doctor bar, this slight pre-bend can also be replaced by a camber of the doctor bar. Thus, very successfully experiments according to the invention could be carried out, for example, with a co-rotating metering rod having a diameter of 9.5 mm at its outer ends and a diameter of 11.8 mm in the center.
  • the contact line of the round element (6) with the carrier web (1) has a distance to the wetting line (3), preferably in a range of 2 cm to 10 cm, very particularly preferably in a range of 4 cm to 6.5 cm. It turned out to be expedient if the round element (6) together with the air guiding means (7) along the direction of movement of the carrier web (1) back and forth mounted, so that the removal of the contact line of the round element (6) with the carrier web (1) to the wetting line (3) in particular within the preferred range limits of 2 cm to 10 cm set for the purpose of optimizing the machine run and can also be readjusted at any time.
  • the at least one guide element (4) is a blade oriented transversely to the direction of movement of the carrier web (1), which touches the upper side of the carrier web (1) and thus slightly presses the carrier web (1) downwards. It is possible that this blade is as a blade part of a paint application device, in which initially to form a pigment-containing precoating a color excess is applied to the top of the carrier web (1), and the excess color with Help the blade is stripped off. On then still undried paint application is then applied by curtain coating a - in this case further - coating material.
  • the blade is part of an air-shielding device (8).
  • it can be such an air-shielding device (8) with an air flow oriented against the direction of movement of the carrier web (1), in which the air stream is applied just before the wetting line, starting immediately above the carrier web (1) to be coated, and thus from the Carrier web (1) separating entrained air and can dissipate.
  • Such basically known Lucasabtubvoriquesen as they are considered in the context of the present invention are preferred, include an air supply in close proximity to the liquid curtain and an air extraction at a greater distance from the liquid curtain.
  • the distance of the guide member (4) placed on the carrier sheet (1) formed as a blade to the wetting line (3) is in a range of 4 mm to 22 mm, more preferably in a range of 6 mm to 12 mm ,
  • the blade is usually rectilinear ground; is conceivable and successfully tested in numerous, the present invention equally underlying attempts to provide the blade with a concave or convex bevel, which is why such a bevel is also considered a preferred embodiment.
  • the blade material is stainless steel, provided with a coating of flame-blasted tungsten carbide, as particularly preferred.
  • the width B (2) of the free-falling vertical curtain (2) is greater than the width B (1) of the carrier web (1).
  • a width difference of 10% to 18%, most preferably from 13% to 15%, based on the width of the carrier web (1) has been found to be particularly suitable.
  • the preferred after his training not guided on its sides curtain (2) so undivided falls on the carrier web (1) and covers it over its entire width. In each case a small outer part of the curtain falls past the carrier web (1).
  • the associated liquid coating material is collected, for example, with color pans and used again.
  • the width B (4) of the blade as the at least one guide element (4) and / or the width B (6) of the round element (6) as the at least one support means (5) and / or the width B ( 7) of the air guiding means (7) are each larger than the width B (1) of the carrier web (1).
  • the carrier web (1) during the actual coating process that is in the range of the wetting line (3), slightly increasing in a range of greater than 0 ° to 10 °, based on the horizontal, out . Accordingly, an angle of incidence ( ⁇ ) between freely falling, vertical curtain (2) and carrier web (1), measured in the direction of movement of the carrier web (1) behind the wetting line (3), in a range of 80 ° to less than 90 °, which is why such an area for the angle of incidence ( ⁇ ) is also considered to be preferred.
  • the heat-sensitive coating material comprises at least one dye precursor and at least one preferred organic color acceptor, wherein the dye precursor and color acceptor are heat-affected color forming react with each other.
  • dye precursors those have proven to be selected from the group of phthalide, xanthene and fluoran compounds, with xanthene compounds being preferred and 3-dibutylamino-6-methyl-7-anilino-fluoran and 3- (N-ethyl, N- isopentyl) amino-6-methyl-7-anilinofluorane are particularly preferred.
  • the recording layer may contain one or more of the basically known colorless or lightly colored dye precursors such as xanthene, fluoran, triarylmethane, diphenylmethane, fluorene, oxazine, thiazine or spiropyran compounds or mixtures thereof.
  • the basically known colorless or lightly colored dye precursors such as xanthene, fluoran, triarylmethane, diphenylmethane, fluorene, oxazine, thiazine or spiropyran compounds or mixtures thereof.
  • Typical compounds of this type are, for example:
  • Xanthene compounds rhodamine-B-anilinolactam, rhodamine-Bp-chloroanilinolactam, 3-diethylamino-7-dibenzylaminofluoran, 3-diethylamino-7-octylaminofluoran, 3-diethylamino-7-phenylfluoran, 3-diethylamino-7-chlorofluoran, 3- Diethylamino-6-chloro-7-methylfluoran, 3-diethylamino-7- (3,4-dichloroanilino) fluoran, 3-diethylamino-7- (2-chloroanilino) fluoran, 3-diethylamino-6-methyl-7- anilinofluoran, 3- (N-ethyl, N-tolyl) amino-6-methyl-7-anilinofluoran, 3-piperidino-6-methyl-7-anilino-fluoran, 3- (
  • Triarylmethane compounds 3,3-bis (p-dimethylaminophenyl) -6-dimethylaminophthalide (Crystal Violet Lactone), 3,3-bis (p-dimethylaminophenyl) phthalide, 3- (p-dimethylaminophenyl) -3- (1,2 -dimethylindol-3-yl) phthalide, 3- (p-dimethylaminophenyl) -3- (2-methylindol-3-yl) phthalide, 3- (p-dimethylaminophenyl) -3- (2-phenylindol-3-yl) phthalide , 3,3-bis (1,2-dimethylindol-3-yl) -5-dimethylaminophthalide, 3,3-bis (1,2-dimethylindol-3-yl) -6-dimathylamino-phthalide, 3,3-bis (9-ethylcarbazoi-3-yl)
  • Diphenylmethane compounds 4,4'-bis-dimethylaminophanylbenzhydrylbenzyl ether, N-halophenyl-leucoauramine, N-2,4,5-trichlorophenylleucoauramine, and the like.
  • Thiazine compounds benzoylleucomethylene blue, p-nitrobenzoylleucomethylene blue, etc.
  • Spiropyran compounds 3-methylspiro-dinaphthopyran, 3-ethylspirodinaphthopyran, 3,3-dichloro-spiro-dinaphthopyran, 3-benzylspiro-dinaphthopyran, 3-methyl-naphtho (3-methoxy-benzo) spiropyran, 3-propyl-spiro benzopyran, etc.
  • the heat-sensitive coating material may, for example, also contain one or more of the following near-infrared absorbing compounds: 3,6-bis (dimethylamino) fluorene-9-spiro-3 '- (6'-dimethylaminophthalide), 3-diethylamino 6-dimethylaminofluorene-9-spiro-3 '- (6'-dimethylaminophthalide), 3,6-bis (diethylamino) -fluorene-9-spiro-3' - (6'-dimethylaminophthalide), 3-dibutylamino-6-dimethylaminofluorene -9-spiro-3 '- (6'-dimethylaminophthalide), 3-dibutylamino-6-diethylaminofluorene-9-spiro-3' - (6'-dimethylaminophthalide), 3,6-bis (dimethylamino) fluorene-9-spiro-3 '- (6'
  • thermosensitive recording material comprises Carrier web (1) at least one pigment-containing coating (9), then the thermosensitive coating material is applied by means of curtain coating process for forming a heat-sensitive recording layer (10).
  • a coating (9) comprising primarily inorganic pigments and compatible binders can very positively affect the response of the recording layer (10) in response to heat input by a thermal printhead.
  • such a pigment-containing coating (9) acts as a heat reflector, that of the thermal head emitted heat, which penetrates the recording layer (10) focused on the heat-sensitive recording layer (10).
  • a pigment-containing coating (9) acts as a heat reflector, that of the thermal head emitted heat, which penetrates the recording layer (10) focused on the heat-sensitive recording layer (10).
  • the organic pigments of the pigment-containing coating (9) preferably have a wall of thermoplastic resin which preferably comprises (meth) acrylonitrile copolymer, polyvinyl chloride, polyvinylidene chloride, polystyrene, styrene acrylate, polyacrylonitrile or polyacrylic acid ester. Pigment mixtures of different organic pigments are conceivable.
  • Preferred inorganic pigments in the pigment-containing coating (9) have been those selected from the group comprising natural and calcined kaolin, silica, bentonite, calcium carbonate and aluminum oxide, in particular boehmite here. Also mixtures of several different types of inorganic pigments are conceivable.
  • the amount ratio between organic and inorganic, oil-absorbing pigment is a compromise of the effects caused by the two types of pigment, which is particularly advantageously solved when the pigment mixture to 15 to 50 wt .-%, more preferably 25 to 40 wt .-%, from and organic to 85 to 50 wt .-% and more preferably to 75 to 60 wt .-% of inorganic pigment.
  • the pigment-containing coating (9) comprises binders selected from the group consisting of polyvinyl alcohol, styrene-butadiene latex, starch, carboxymethyl cellulose, cellulose derivatives, styrene-butadiene latex being particularly preferred.
  • binders selected from the group consisting of polyvinyl alcohol, styrene-butadiene latex, starch, carboxymethyl cellulose, cellulose derivatives, styrene-butadiene latex being particularly preferred.
  • the binder content in the pigment-containing coating (9) preferably to 69 to 76 wt .-% of styrene-butadiene latex.
  • Such a preferred pigment-containing coating (9) can further positively contribute to the leveling of the surface of the carrier sheet (1), thus reducing the amount of coating material for the heat-sensitive recording layer (10) to be necessarily applied.
  • the coating of the pigment-containing coating (9) is provided with leveling coating devices, such as, for example, roller coater, doctor blade or doctor blade coater. If oil-absorbing pigments are incorporated into the pigment-containing coating (9) as inorganic pigments, they can absorb the wax constituents of the heat-sensitive recording layer (10) liquefied by the action of heat of the thermal head during typeface formation and thus promote improved and accelerated operation of the heat-induced recording.
  • the basis weight of the pigment-containing coating (9) is preferably between 5 and 20 g / m 2 and more preferably between 6 and 10 g / m 2 .
  • the basis weight is preferably from 2 to 8 g / m 2, and more preferably from 2.5 to 6 g / m 2 .
  • the carrier web (1) is formed, in addition to the preferably provided at least one pigment-containing coating (9), from a substrate (11).
  • a substrate (11) paper and especially a non-surface treated base paper is the substrate (11), which has prevailed on the market with regard to good environmental compatibility because of good recyclability and that in the context of the invention is preferred.
  • a non-surface treated base paper is to be understood as meaning a base paper which has not been treated in a size press or in a coating device.
  • films of, for example, polyolefin and polyolefin-coated papers as substrate (11) are possible to the same extent, without such an embodiment having an exclusive character.
  • the so-called slot casters in which the liquid coating material by a downwardly directed, arranged across the carrier web to be coated (1) arranged outlet gap and there immediately forms the free-falling liquid curtain, and the so-called Gleit vomg teller.
  • the liquid coating material is first applied to a downwardly inclined sliding surface, where the liquid in a thin film under the influence of gravity flows down the sliding surface and forms at the end of the free-falling liquid curtain,
  • Previously discussed preferred embodiments of the claimed method for single or multiple coating of a continuously moving carrier web with a liquid coating material by the curtain coating method should also be correspondingly preferred embodiments of the device to be used therefor.
  • the preferred round element (6) is a metering rod, wherein it is then considered to be particularly advantageous to form the air guide (7) as Rundelement- or as Rakelstabhalterung.
  • the metering rod is designed to be fixed or rotatable, wherein its rotational direction with respect to the direction of movement of the carrier web (1) can be mitläuf, which means that the surface movement of the metering rod in the contact region with the carrier web (1) with the same orientation with the direction of movement of the carrier web (1 ), or alternatively may be in opposite directions.
  • the diameter of the metering rod a range of 9 mm to 16 mm, especially a range of 13 to 14 mm, is preferred.
  • the doctor bar has a slight pre-bend in the direction of the underside of the carrier web (1).
  • a metering rod is preferred without pre-bending, it can also be replaced by a camber.
  • very successfully experiments according to the invention could be carried out, for example, with a co-rotating metering rod having a diameter of 9.5 mm at its outer ends and a diameter of 11.8 mm in the center.
  • the contact line of the metering rod with the carrier web (1) has a distance to the wetting line (3) in a preferred range of 2 cm to 10 cm, in particular in a range of 4 cm to 6.5 cm.
  • the metering rod together with the air guiding means (7) preferably designed as a doctor rod holder, is reciprocally mounted along the direction of movement of the carrier web (1), so that the removal of the contact line of the metering rod with the carrier web (1 ) to the wetting line (3) in particular within the preferred range limits of 2 cm to 10 cm set for the purpose of optimizing the machine run and can also be readjusted at any time.
  • the claimed device for single or multiple coating of a continuously moving carrier web (1) with a liquid coating material according to the curtain coating method preferably comprises an air shielding device (8), as part of which the guide element (4) in the form of a transversely to the direction of movement of the carrier web (1) aligned Blade is formed.
  • the distance of the blade laying on the carrier web (1) to the wetting line (3) is in a range from 4 mm to 22 mm, particularly preferably in a range from 6 mm to 12 mm.
  • the blade is usually rectilinearly sanded; conceivable and successfully tested in numerous, the present invention equally underlying experiments, the blade is to be provided with a concave or convex bevel, which is why such a bevel is also considered a preferred embodiment.
  • a blade material is stainless steel, provided with a coating of flame-blasted tungsten carbide, as particularly preferred.
  • the preferred air-shielding device (8) may be one with an air flow oriented against the direction of movement of the carrier web (1), in which the air flow is applied just before the wetting line, starting immediately above the carrier web (1) to be coated, and so on separating and discharging the air entrained by the carrier web (1).
  • the Heilabcanvoriques (8) preferably comprises an air supply in close proximity to the liquid curtain and an air extraction at a greater distance from the liquid curtain.
  • Devices according to the invention as described here in numerous embodiments, and the methods proposed in numerous embodiments and variants for single or multiple coating of a continuously moving carrier web with a liquid coating material according to the curtain coating method, wherein the optionally heat-sensitive coating material is a free-falling , vertical curtain, allow speeds during the coating in a range above 1200 m / min or even above 1500 m / min, without causing line errors, for example in the form of line dropouts.
  • the methods and devices proposed in this way are thus able to convincingly solve the problem underlying the invention in all its embodiments and variants.
  • the surface mass,% by weight (% by weight) and parts by weight (parts by weight) given in the specification and claims refer to the "atro" weight, respectively. absolutely dry parts by weight.
  • the relevant figures are calculated from the "lutro" weight, i. air-dry parts by weight, minus the proportion by weight of water around and inside the pigments in their form of delivery.
  • FIG. 1 An embodiment of the method according to the invention is described with the aid of FIG. 1 represented, in the first a carrier web (1) is shown, which is guided by means of the two symbolized as driven rollers guide rollers R 1 and R 2 below components (12) for forming a curtain (2) of liquid coating material.
  • a carrier web (1) is shown, which is guided by means of the two symbolized as driven rollers guide rollers R 1 and R 2 below components (12) for forming a curtain (2) of liquid coating material.
  • a substrate of paper with a basis weight of 58 g / m 2 and applied with a pigment-containing coating of 8 g / m 2 is to be assumed as the carrier web (1)
  • a so-called slot caster as represented part of the components ( 12) for the formation of the curtain (2) used.
  • a free falling curtain (2) of liquid heat-sensitive coating material is formed, which is shown below the components (12) of the slot caster.
  • the curtain (2) hits along the wetting line (3) at an angle ( ⁇ ) from here 85 ° on the carrier web (1), where from the heat-sensitive coating material of the curtain (2), a heat-sensitive recording layer with a basis weight of 4 g / m 2 is formed.
  • an air-shielding device (8) Spaced apart on the guide roller R 1 are parts of an air-shielding device (8) to be seen, which is formed as so-called AirCut and not shown components for effecting against the direction of movement of the carrier web (1) oriented air flow, of the carrier web (1) remove entrained air and remove it.
  • the guide rail (4) To the curtain (2) below the forming these components (12) towards the Heilabcanvoriques (8) is limited by a straight ground blade, the guide rail (4) the carrier web (1) over its entire width and in the direction of movement of the carrier web (1) - Pressed down from the guide roller R 1 to the guide roller R 2 - immediately, more precisely at a distance of 8 mm in front of the wetting line (3).
  • the carrier web (1) is raised by a support means (5) formed as a round element (6) in the form of a 13.2 mm diameter, non-rotating, smooth doctor bar.
  • the doctor bar is held by a in the direction of the carrier web (1) located behind the metering rod holder which is formed as an air guide (7).
  • an angle ( ⁇ ) shown enlarged for reasons of better graphic identification, should be set at 4.5 ° in the present case.
  • FIG. 2 A heat-sensitive recording material, as with the in FIG. 1 can be produced, is shown in FIG. 2 shown.
  • the recording material here comprises the substrate (11) here made of paper with a basis weight of 58 g / m 2 , the pigment-containing coating (9) here with a basis weight of 8 g / m 2 , wherein substrate (11) and pigment-containing Coating (9) together make up the carrier web (1) to be coated by curtain coating methods, and finally the heat-sensitive recording layer (10) here having a basis weight of 4 g / m 2 .

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  • Application Of Or Painting With Fluid Materials (AREA)
  • Coating Apparatus (AREA)
  • Heat Sensitive Colour Forming Recording (AREA)

Claims (22)

  1. Procédé pour le revêtement simple ou multiple d'une bande de support (1) en mouvement continu, avec un matériau liquide de revêtement selon le procédé d'enduction au rideau, dans lequel à partir du matériau de revêtement est formé un rideau vertical (2) tombant librement, qui tombe le long d'une ligne de mouillage (3) sur la bande de support (1) qui, sur toute sa largeur,
    • est abaissée par au moins un élément de guidage (4) avant de franchir la ligne de mouillage (3) et
    • est relevée par au moins un moyen de soutien (5) après avoir franchi la ligne de mouillage (3),
    caractérisé en ce que
    ○ ledit au moins un moyen de soutien (5) comprend un élément arrondi (6) s'étendant perpendiculairement au sens de déplacement de la bande de support (1) et des déflecteurs d'air (7) placés à la suite de l'élément arrondi (6) dans le sens de déplacement de la bande de support (1),
    ○ un angle (α) dans la plage de 2° à 15° étant ajusté entre la bande de support (1) et la face supérieure des déflecteurs d'air (7).
  2. Procédé pour la production d'un matériau d'enregistrement thermosensible selon le procédé d'enduction au rideau, dans lequel un matériau de revêtement thermosensible est appliqué sur une bande de support (1) en mouvement continu, par formation à partir du matériau de revêtement thermosensible d'un rideau vertical (2) tombant librement, qui tombe le long d'une ligne de mouillage (3) sur la bande de support (1) qui, sur toute sa largeur,
    • est abaissée par au moins un élément de guidage (4) avant de franchir la ligne de mouillage (3) et
    • est relevée par au moins un moyen de soutien (5) après avoir franchi la ligne de mouillage (3),
    et dans lequel
    ○ ledit au moins un moyen de soutien (5) comprend un élément arrondi (6) s'étendant perpendiculairement au sens de déplacement de la bande de support (1) et des déflecteurs d'air (7) placés à la suite de l'élément arrondi (6) dans le sens de déplacement de la bande de support (1),
    ○ un angle (α) dans la plage de 2° à 15° est ajusté entre la bande de support (1) et la face supérieure des déflecteurs d'air (7).
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce que l'élément arrondi (6) est une barre de racle.
  4. Procédé selon la revendication 3, caractérisé en ce que les déflecteurs d'air (7) sont constitués en tant que support de la barre de racle.
  5. Procédé selon l'une quelconque des revendications 3 et 4, caractérisé en ce que la barre de racle tourne dans le même sens ou dans le sens contraire par rapport au sens de déplacement de la bande de support (1).
  6. Procédé selon l'une quelconque des revendications 3 à 5, caractérisé en ce que la barre de racle présente un diamètre plus faible à ses extrémités externes qu'en son milieu.
  7. Procédé selon l'une quelconque des revendications 3 et 6, caractérisé en ce que la barre de racle est sous le courant d'un fluide pour son refroidissement.
  8. Procédé selon l'une quelconque des revendications 1 à 7, caractérisé en ce que l'élément arrondi (6) peut être avancé et reculé conjointement avec les déflecteurs (7) le long du sens de déplacement de la bande de support (1).
  9. Procédé selon l'une quelconque des revendications 1 à 8, caractérisé en ce que la largeur B(2) du rideau (2) vertical tombant librement est supérieure à la largeur B(1) de la bande de support (1).
  10. Procédé selon l'une quelconque des revendications 1 à 9, caractérisé en ce que ledit au moins un élément de guidage (4) est une lame orientée perpendiculairement au sens de déplacement de la bande de support (1).
  11. Procédé selon la revendication 10, caractérisé en ce que la lame en tant que ledit au moins un élément de guidage (4) fait partie d'un dispositif de protection contre l'air (8).
  12. Procédé selon l'une quelconque des revendications 10 et 11, caractérisé en ce que la lame présente une face concave ou convexe.
  13. Procédé selon l'une quelconque des revendications 1 à 12, caractérisé en ce que la largeur B(4) de la lame en tant que ledit au moins un élément de guidage (4) et/ou la largeur B(6) de l'élément arrondi en tant que ledit au moins un moyen de soutien (5) et/ou la largeur B(7) des déflecteurs d'air (7) est/sont supérieure(s) chacune à la largeur B(1) de la bande de transport (1).
  14. Procédé selon l'une quelconque des revendications 1 à 13, caractérisé en ce qu'un angle de contact (β) entre le rideau vertical (2) tombant librement et la bande de support (1); mesuré dans le sens de déplacement de la bande de support (1) après franchissement de la ligne de mouillage (3), est ajusté dans une plage allant de 80° à moins de 90°.
  15. Procédé pour la production d'un matériau d'enregistrement thermosensible selon l'une quelconque des revendications 2 à 14, caractérisé en ce que le matériau de revêtement thermosensible comporte au moins un précurseur de colorant choisi dans le groupe des composés phtalide, xanthène et fluorane, et au moins un accepteur chromogène organique choisi dans le groupe comprenant
    • le 2,2-bis(4-hydroxyphényl)-propane,
    • les 4-[(4-(1-méthyéthoxy)phényl)sulfonyl]phénols,
    • les 4,4'-dihydroxy-diphénylsulfones,
    • les N-(p-toluènesulfonyl)-N'-(3-p-toluènesulfonyl-oxy-phényl)-urées,
    • les 2,4'-dihydroxy-diphénylsulfones,
    • les N-(2-hydroxyphényl)-2-[(4-hydroxyphényl)thio]acétamides,
    précurseur de colorant et accepteur chromogène réagissant l'un avec l'autre sous l'effet de la chaleur en engendrant une couleur.
  16. Procédé pour la production d'un matériau d'enregistrement thermosensible selon l'une quelconque des revendications 2 à 15, caractérisé en ce que le matériau d'enregistrement thermosensible comprend une bande de support (1) comportant un substrat (11) en papier et un revêtement (9) contenant un pigment et une couche d'enregistrement thermosensible (10) formée à partir du matériau de revêtement thermosensible.
  17. Procédé pour la production d'un matériau d'enregistrement thermosensible selon la revendication 16, caractérisé en ce que le revêtement (9) contenant un pigment contient un mélange de pigments organiques et de pigments inorganiques.
  18. Procédé pour la production d'un matériau d'enregistrement thermosensible selon l'une quelconque des revendications 16 et 17, caractérisé en ce que le revêtement (9) contenant un pigment contient des pigments inorganiques choisis dans le groupe comprenant le kaolin naturel tel que calciné, l'oxyde de silicium, la bentonite, le carbonate de calcium ainsi que l'oxyde d'aluminium.
  19. Dispositif pour le revêtement simple ou multiple d'une bande de support (1) en mouvement continu, avec un matériau liquide de revêtement selon le procédé d'enduction au rideau, comprenant
    • des composants (12) pour la formation d'un rideau vertical (2) tombant librement, à partir du matériau liquide de revêtement qui tombe le long d'une ligne de mouillage (3) sur la bande de support (1),
    • au moins un élément de guidage (4) pour l'abaissement de la bande de support (1) sur toute sa largeur - dans le sens de déplacement de la bande de support (1) - avant la ligne de mouillage (3),
    • au moins un moyen de soutien (5) pour le relèvement de la bande de support (1) sur toute sa largeur - dans le sens de déplacement de la bande de support (1) - après la ligne de mouillage (3),
    caractérisé en ce que
    ○ ledit au moins un moyen de soutien (5) comprend un élément arrondi (6) s'étendant perpendiculairement au sens de déplacement de la bande de support (1) et des déflecteurs d'air (7) placés à la suite de l'élément arrondi (6) dans le sens de déplacement de la bande de support (1),
    ○ un angle (α) dans la plage de 2° à 15° étant ajusté entre la bande de support (1) et la face supérieure des déflecteurs d'air (7).
  20. Dispositif selon la revendication 19, caractérisé en ce que l'élément arrondi (6) est une barre de racle et les déflecteurs d'air (7) sont constitués en tant que support de racle.
  21. Dispositif selon la revendication 20, caractérisé en ce que la barre de racle présente un diamètre plus faible à ses extrémités externes qu'en son milieu.
  22. Dispositif selon l'une quelconque des revendications 19 à 21, caractérisé en ce que l'élément arrondi (6) est monté pour pouvoir avancer et reculer conjointement avec les déflecteurs d'air (7) longitudinalement dans le sens de déplacement de la bande de support (1).
EP06018364A 2006-09-01 2006-09-01 Procédé de revêtement en rideau et dispositif correspondant Not-in-force EP1895051B1 (fr)

Priority Applications (6)

Application Number Priority Date Filing Date Title
DE502006003618T DE502006003618D1 (de) 2006-09-01 2006-09-01 Vorhangbeschichtungsverfahren sowie eine dafür verwendete Vorrichtung
AT06018364T ATE430217T1 (de) 2006-09-01 2006-09-01 Vorhangbeschichtungsverfahren sowie eine dafür verwendete vorrichtung
EP06018364A EP1895051B1 (fr) 2006-09-01 2006-09-01 Procédé de revêtement en rideau et dispositif correspondant
CN2007800369527A CN101522990B (zh) 2006-09-01 2007-08-23 落帘涂布方法及用于此方法的装置
US12/083,656 US7939140B2 (en) 2006-09-01 2007-08-23 Curtain coating process and device used for this purpose
PCT/EP2007/007411 WO2008025479A2 (fr) 2006-09-01 2007-08-23 Procédé de revêtement de rideau et dispositif utilisé à cette fin

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP06018364A EP1895051B1 (fr) 2006-09-01 2006-09-01 Procédé de revêtement en rideau et dispositif correspondant

Publications (2)

Publication Number Publication Date
EP1895051A1 EP1895051A1 (fr) 2008-03-05
EP1895051B1 true EP1895051B1 (fr) 2009-04-29

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Country Status (6)

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US (1) US7939140B2 (fr)
EP (1) EP1895051B1 (fr)
CN (1) CN101522990B (fr)
AT (1) ATE430217T1 (fr)
DE (1) DE502006003618D1 (fr)
WO (1) WO2008025479A2 (fr)

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WO2012087574A1 (fr) * 2010-12-20 2012-06-28 Neptune Research, Inc. Systèmes, procédés et dispositifs pour appliquer des composites fluides sur une feuille porteuse
US10265719B2 (en) 2011-04-13 2019-04-23 Durr Megtec, Llc Method and apparatus for coating discrete patches
CA3074816C (fr) 2011-06-03 2022-05-24 Durr Systems, Inc. Dispositif de levage/stabilisateur de bande et procede associe
DE102014107567B3 (de) * 2014-05-28 2015-11-05 Papierfabrik August Koehler Se Wärmeempfindliches Aufzeichnungsmaterial
CN106436460B (zh) * 2016-12-23 2019-01-22 赵英 一种纸张涂布装置
EP3375534A1 (fr) 2017-03-17 2018-09-19 Ricoh Company Ltd. Dispositif et procédé de revêtement de rideau
CN114147192A (zh) * 2021-12-07 2022-03-08 电子科技大学长三角研究院(湖州) 一种倾斜自流延制备超薄锂带/箔的方法及装置

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CN102553778B (zh) * 2010-10-05 2014-10-01 株式会社理光 幕涂方法和幕涂设备

Also Published As

Publication number Publication date
CN101522990A (zh) 2009-09-02
US20090130323A1 (en) 2009-05-21
ATE430217T1 (de) 2009-05-15
WO2008025479A3 (fr) 2008-04-24
CN101522990B (zh) 2011-11-09
WO2008025479A2 (fr) 2008-03-06
US7939140B2 (en) 2011-05-10
EP1895051A1 (fr) 2008-03-05
DE502006003618D1 (de) 2009-06-10

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