EP2183057A2 - Procédé et dispositif d'application de revêtements plastiques - Google Patents

Procédé et dispositif d'application de revêtements plastiques

Info

Publication number
EP2183057A2
EP2183057A2 EP08785039A EP08785039A EP2183057A2 EP 2183057 A2 EP2183057 A2 EP 2183057A2 EP 08785039 A EP08785039 A EP 08785039A EP 08785039 A EP08785039 A EP 08785039A EP 2183057 A2 EP2183057 A2 EP 2183057A2
Authority
EP
European Patent Office
Prior art keywords
coating
film
substrate surface
coating material
smoothing
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.)
Granted
Application number
EP08785039A
Other languages
German (de)
English (en)
Other versions
EP2183057B1 (fr
Inventor
Dirk Schlatterbeck
Andre F. Ceppi
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.)
Actega Schmid Rhyner AG
Original Assignee
Schmid Rhyner 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 Schmid Rhyner AG filed Critical Schmid Rhyner AG
Publication of EP2183057A2 publication Critical patent/EP2183057A2/fr
Application granted granted Critical
Publication of EP2183057B1 publication Critical patent/EP2183057B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/40—Distributing applied liquids or other fluent materials by members moving relatively to surface
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
    • B05C11/02—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface ; Controlling means therefor; Control of the thickness of a coating by spreading or distributing liquids or other fluent materials already applied to the coated surface
    • B05C11/06—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface ; Controlling means therefor; Control of the thickness of a coating by spreading or distributing liquids or other fluent materials already applied to the coated surface with a blast of gas or vapour
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/04—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to gases
    • B05D3/0406—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to gases the gas being air
    • B05D3/042—Directing or stopping the fluid to be coated with air
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
    • B05D5/06—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain multicolour or other optical effects
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F23/00—Devices for treating the surfaces of sheets, webs, or other articles in connection with printing
    • B41F23/08—Print finishing devices, e.g. for glossing prints
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00—Coated paper; Coating material
    • D21H19/10—Coatings without pigments
    • D21H19/14—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12
    • D21H19/16—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12 comprising curable or polymerisable compounds
    • 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
    • D21H25/00—After-treatment of paper not provided for in groups D21H17/00 - D21H23/00
    • D21H25/08—Rearranging applied substances, e.g. metering, smoothing; Removing excess material
    • D21H25/16—Rearranging applied substances, e.g. metering, smoothing; Removing excess material with a blast of vapour or gas, e.g. air knife
    • 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
    • B05C5/02—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2203/00—Other substrates
    • B05D2203/22—Paper or cardboard
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2252/00—Sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/02—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
    • B05D3/0254—After-treatment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/06—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to radiation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M7/00—After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock
    • B41M7/0027—After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock using protective coatings or layers by lamination or by fusion of the coatings or layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M7/00—After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock
    • B41M7/0045—After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock using protective coatings or film forming compositions cured by mechanical wave energy, e.g. ultrasonics, cured by electromagnetic radiation or waves, e.g. ultraviolet radiation, electron beams, or cured by magnetic or electric fields, e.g. electric discharge, plasma
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
    • D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
    • D21H23/22—Addition to the formed paper
    • D21H23/50—Spraying or projecting
    • 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
    • D21H23/52—Addition to the formed paper by contacting paper with a device carrying the material
    • D21H23/56—Rolls
    • 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
    • D21H25/00—After-treatment of paper not provided for in groups D21H17/00 - D21H23/00
    • D21H25/04—Physical treatment, e.g. heating, irradiating
    • 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
    • D21H25/00—After-treatment of paper not provided for in groups D21H17/00 - D21H23/00
    • D21H25/08—Rearranging applied substances, e.g. metering, smoothing; Removing excess material
    • D21H25/12—Rearranging applied substances, e.g. metering, smoothing; Removing excess material with an essentially cylindrical body, e.g. roll or rod
    • D21H25/14—Rearranging applied substances, e.g. metering, smoothing; Removing excess material with an essentially cylindrical body, e.g. roll or rod the body being a casting drum, a heated roll or a calender

Definitions

  • the invention generally relates to the application of coatings, such as paints.
  • the invention relates to devices and measures for the targeted influencing of the surface structure of the still fluid film such. the smoothing of coated coating films.
  • smoothing is meant in particular the elimination of undesirable structures or disturbances of the coating surface, which will be explained in more detail below.
  • applied coating films may have undesirable structures or defects.
  • Such structures or perturbations may include, but are not limited to, roll structures, roll transfer longitudinal structures, longitudinal streaks of uneven application, or transfer coating coating defects.
  • the surface finish of the substrate can cause structures or perturbations on the coating surface. For example, by not wetted wells in the substrate, craters on the Coating surface arise. This may be the case in particular, but not exclusively in the case of contactless application of the coating material, in particular in the case of non-contact application by nozzles.
  • a method for smoothing layers is further known, in which applied to a pad liquid or dough-like layers are smoothed by means of ultrasound.
  • an ultrasonic transducer is provided, which transmits to the layer.
  • the substrate with the layer is brought into contact with the ultrasonic vibrator from the rear for effective transmission of the ultrasonic vibrations, wherein the substrate is curved or bent over the ultrasonic vibrator.
  • the object of the invention is to eliminate or smooth surface disturbances occurring during the coating application in order to produce a smooth surface regardless of the applied application method and the substrates used.
  • the invention provides a device and a
  • a method for applying coatings on surfaces of substrates wherein a coating unit for applying coating material in fluid form to the substrate surface, and a conveyor is used to the substrate surface relative to
  • Coating unit along a running direction to move past the coating unit is preferably moved past a stationary coating unit. It is also conceivable to hold the substrate and move the coating unit.
  • a device for selectively influencing the coating surface such as e.g. the smoothing of the still applied to the substrate surface by means of the coating unit, still provided fluid film.
  • This device includes means for generating a gas stream which is directed to the film-coated substrate surface and smoothes the film, at least partially eliminating spurious structures of the film surface such as pits, bumps and craters prior to curing of the coating material. The smoothing is carried out accordingly by the gas flow contactless.
  • the transport of the coating material through the gas stream is preferably kept smaller than 1 mm, more preferably smaller than 0.25 mm along the surface.
  • the contours of the edges of coated areas remain particularly preferably unaffected by the smoothing. This means that the smoothing does not introduce coating material into uncoated areas.
  • the invention is particularly in connection with a non-contact coating order by a
  • Nozzle arrangement suitable.
  • a computer-aided control device for controlling the coating nozzles is advantageous, so that laterally patterned by appropriate control of the nozzles Coatings, here in particular to produce a recess of areas of the substrate surface.
  • a drop-on-demand, or demand droplet coating unit with nozzles for dispensing each individual droplets of the coating material in response to control signals used.
  • the nozzles of the coating unit are preferably arranged in at least one row transversely to the direction of travel.
  • these craters can be at least significantly reduced in their number by applying the not yet solidified paint or coating film in a very simple manner.
  • the nozzles of the coating unit are arranged in at least one row, which extends transversely to the direction and the processable substrate width spans at least three quarters perpendicular to the direction of rotation, wherein the nozzles are preferably arranged rigidly in the direction transverse to the direction.
  • the nozzles thus cover the entire area of the substrate to be coated only by movement along one direction, namely the direction of travel.
  • the coating unit can therefore also comprise a device for roller application and / or a screen printing device.
  • a coating with roller application is particularly thought of flexographic printing, gravure and simple, full-surface roller painting. The flexo printing process rolls with a
  • the device for generating a gas stream comprises at least one row of gas nozzles which extends transversely to the direction of travel.
  • the gas flows may be adjusted by suitable nozzle shapes and nozzle sizes for the purpose of the invention.
  • the nozzles of a smoothing device have a diameter of at least 0.05 millimeters to at most 10 millimeters, more preferably between 0.1 to 5 millimeters, particularly preferably between 0.2 and 2 millimeters or between 0.5 and 1 millimeters.
  • One way to improve the smoothing effect is to provide a nozzle assembly that generates air streams that strike the substrate surface under different spatial directions and / or have gradients in the flow velocity in multiple directions along the surface.
  • turbulators can be provided, for example, in the nozzle or nozzles, which swirl the gas stream.
  • the or the gas streams can be acted upon by ultrasonic waves.
  • the angle of the gas flow is for this purpose between an angle greater than 0 ° and up to 90 °, preferably in the range of 10 ° or 20 ° to 80 °, preferably in the range of 30 ° to 70 °, particularly preferably in the range of 40 ° to 60 ° measured from the solder to the surface.
  • Yet another measure is to pulse the gas stream (s) instead of evenly flowing out of the nozzle (s).
  • crater-like depressions depending on the nature of the substrate, in particular occur at small layer thicknesses.
  • the application of the invention is therefore particularly suitable for thinner coating films.
  • a film with a layer thickness less than 100 microns, preferably less than 50 microns, more preferably less than 30 microns is applied and then smoothed before solidification. Even very thin coatings with layer thicknesses of less than 20 microns, even smaller than 10 microns layer thickness can be smoothed with elimination of wells and / or openings. Even coating surfaces of films with layer thicknesses of less than 5 micrometers can be positively influenced by the method according to the invention.
  • the smoothing of a film of still fluid coating material may apply, in which by means of the gas flow crater-like depressions or structures which are transferred from the substrate or by the coating process are removed or closed.
  • new, desired as desired structures can be generated, for example, to give the cured film a special look and / or haptic appearance.
  • the gas flow in the angle of incidence and flow rate is adjusted so that smaller depressions not only smoothed, but at the same time additional by local displacement and / or redeployment of the coating material Structures are created.
  • Such selectively generated structures can be, among other things, crimping structures, undulations, depressions, ribs or grooves.
  • the film after the targeted influencing of the surface e.g. the smoothing by means of a separate curing or drying device for curing or drying of the coating material in a solid form.
  • This device is arranged downstream in the direction of the device for influencing the surface, so that the substrate surface passes first the coating unit, then the device for influencing the surface and then the curing device.
  • Particularly suitable in this case is the application of UV-curable coatings, in particular UV overprint varnish and curing of the coating material by irradiation of UV light after smoothing.
  • the curing device comprises a light source, preferably a UV light source.
  • a coating material is applied to it, which at the processing temperature has a dynamic viscosity of at least 10 seconds and at most 1000 seconds, preferably at most 500 seconds, more preferably at most 200 seconds, possibly even at most 100 seconds, measured as the flow time of a volume of 100 cm 3 from a DIN cup with a 4 mm diameter outlet nozzle.
  • the adjustment of the viscosity can also be done by adjusting the temperature, so that even highly viscous or low-viscosity coating materials can be applied and smoothed.
  • a device for applying coatings to surfaces of substrates which likewise comprises a coating unit for applying coating material in fluid form, as well as a conveying device, to the substrate surface move relative to the coating unit along a running direction on the coating unit, preferably in turn by moving the substrate to a fixed coating unit.
  • a device for selectively influencing the coating surface, in particular for smoothing the still fluid film applied to the substrate surface by means of the coating unit, wherein the device for selectively influencing the surface of the fluid coating material comprises an arrangement of needles which, for influencing the surface, in particular for smoothing, touch the surface.
  • the needles can pierce into the film. The piercing of the needles causes a localized movement of the liquid coating material which results in the compensation of surface irregularities present in the puncture site or in areas near the puncture site.
  • the device may be designed in the same way as the device described above.
  • a non-contact coating so may alternatively or additionally, for example, a device for roller application, such as for the simple full-surface, flexo or gravure job, or be provided for screen printing.
  • the rolling avoids that the needle tips move along the film and then in turn insert unwanted structures in the form of grooves in the film.
  • the needles can generally also be controlled with a control so that they selectively touch the film selectively or in a predetermined pattern.
  • an ultrasonic oscillator can be provided, which is coupled to the needles.
  • the needles are subjected to ultrasonic vibrations and transmit them via the needle tips in the film.
  • the needles can be selectively controlled by electromechanical devices such as piezo control or a suitable control via compressed air to z. B. only to touch areas on which coating material has been applied.
  • the piezo or compressed air control can also be used, for example, to generate a vertical or lateral movement of the needles in order to expand or support the smoothing effect. Furthermore, with partial coating, this movement can at least reduce the smearing of the coating film.
  • a targeted influencing of the surface of the film by means of a targeted, non-contact heating by the means for selectively influencing the surface of the fluid coating material is provided.
  • the substrate surface is moved relative to the coating unit along a running direction of the coating unit, preferably by moving the substrate to a fixed coating unit, which on the substrate surface by means of
  • Coating unit applied, still fluid film is specifically influenced before its solidification, wherein for influencing the coating surface at least one of the measures is carried out: a gas stream is generated and directed onto the substrate surface coated with the film,
  • the heating may be by an oven, a radiation source (e.g., an IR emitter), preferably a laser, and / or by means for generating electromagnetic radiation of other wavelengths, preferably microwaves.
  • a radiation source e.g., an IR emitter
  • a laser e.g., a laser
  • means for generating electromagnetic radiation of other wavelengths, preferably microwaves e.g., microwaves.
  • a heating device for heating the at least one gas stream can be provided, so that a smoothing takes place with a heated gas stream.
  • Radiation used for local heating a means for scanning the beam or beams over the substrate surface, or at least a portion of which may be provided. In this way, an energetic, localized beam or multiple such beams can sweep the entire surface to be smoothed.
  • coated surfaces of any material and any geometry can target the targeted Influencing the still liquid coating surface preferably be smoothing by the inventive device.
  • the device can be designed in particular for coating paper, cardboard or plastic films. Thought is particularly to the coating of printed products, preferably for their refinement. Especially with substrates such as paper or cardboard, which have a certain porosity, otherwise often the problem of occurring in the coating crater-like depressions, especially here in conjunction with a contract of the coating material in the drop-on-demand method or another non-contact coating process.
  • the device according to the invention in general, it is also intended to use the device according to the invention in a printing machine, such as an offset, flexo, gravure or screen printing machine. In this way, printed products can be printed in a single printing machine, such as an offset, flexo, gravure or screen printing machine. In this way, printed products can be printed in a single printing machine, such as an offset, flexo, gravure or screen printing machine. In this way, printed products can be printed in a single
  • Fig. 1 is a schematic view of an apparatus for
  • Fig. 2 is a view of a sheet-fed offset printing machine with a coating unit for applying and
  • Fig. 3 is a schematic view of another
  • Fig. 4 parts of a device for selectively influencing surfaces of liquid
  • Fig. 6 shows a further embodiment of a device for selectively influencing coating surfaces, with which a smoothing by local heating of the
  • Fig. 7 is an electron micrograph of a crater-like depression in one applied paint film before the targeted influencing with the inventive method
  • FIG. 9 section through one of the two crater-like
  • FIG. 1 an embodiment of a device 1 for the processing of printed products is shown.
  • a lacquer coating is applied to the surface 21 of a preferably printed paper or cardboard substrate 2 by means of the device 1.
  • a conveying device is provided, which in the illustrated example comprises rollers 11, on which the substrate 2 with the side 22 resting on a coating unit 5 in the form of a coating unit is moved along a running direction 13.
  • the coating unit 5 carries a film 7 initially still fluid coating material in the form of a UV-curable coating controlled by a computer 15.
  • the coating unit 5 operates on the drop-on-demand principle, the nozzles 51 of the coating unit 5, in response to control signals from the computer 15, hurling individual drops onto the substrate surface 21 to be coated, the drops forming a preferably closed film.
  • the nozzles 51 are arranged in a row to the running direction, wherein the row spans at least 3/4 of the width, preferably the entire width of the substrate 2.
  • it is preferable to use an arrangement of nozzles 51 which, during the coating, are held rigidly in the direction transverse to the running direction. Unlike shown in Fig. 1, a plurality of rows of nozzles arranged one behind the other in the running direction can also be provided.
  • a device for selectively influencing the coating surface e.g. provided for smoothing the surface 9.
  • This comprises a series of nozzles 91 directed towards the substrate surface.
  • the row of nozzles 91, as well as the at least one row of coating nozzles 51, likewise runs transversely to the direction of rotation 13.
  • the nozzles 91 of this device 9 are connected to at least one source of compressed air, so that escape from the nozzles 91 air flows 93, which hit the substrate surface 21, and the film applied thereto.
  • a slight horizontal shift in the film 7 is effected, so that crater-like recesses 71 are formed which are formed during the drop-on-demand coating of the porous paper or cardboard substrate 2.
  • the smoothing effect of the air currents is also improved by the axes of the nozzles, and accordingly the exiting air currents obliquely below directed at an angle 92 to the solder on the side 21 of the substrate 2.
  • the angle 92 is between 0 ° and 90 °, preferably between 20 ° to 80 °, in particular between 30 ° to 70 °, particularly preferably between 40 ° to 60 °.
  • An improvement of the smoothing effect is already achieved by having a plurality of discrete gas streams through the plurality of nozzles and / or gradients in the flow velocity in several directions along the surface instead of a single gas stream, such as can be generated with a slot nozzle.
  • the film is cured.
  • a curing device for curing the coating material is provided, which is arranged downstream in the running direction of the device 9.
  • the curing device comprises a UV light source 10. This light source emits UV light with a spectrum which is suitable for the curing reaction in combination with the photoinitiator used.
  • UV light of the UV light source 10 a radical polymerization of the hitherto still fluid UV varnish is set in motion.
  • Suitable examples are UV-curing acrylate-based coatings.
  • the device 1 can not only a device for
  • the printed products can also be produced with the device, with the nozzles 51 of the coating unit 5 printing inks as a coating be applied, the surface of which is then smoothed with the device 9.
  • UV curing inks can be used, which are then solidified by the UV light of the UV light source 10.
  • FIG. 2 shows a further embodiment in which a device 1 according to the invention is integrated in an offset printing machine 30.
  • the offset printing machine 30 is formed in the illustrated example as a sheet-fed offset printing machine for printing substrates 2 in the form of individual paper or cardboard sheets.
  • a web offset printing press can also be used.
  • the printing press 30 comprises an inking unit 31, with which ink 32 is applied to the plate cylinder 38 via a series of rollers 33.
  • the pressure plate is attached.
  • a dampening unit 34 applies water 35 via a further arrangement of rollers 36 on the printing plate on the plate cylinder 38, wherein the ink is displaced by the non-illustrated points of the printing plate.
  • From the plate cylinder 38 the printed image is transferred to the printing cylinder 39 provided with a blanket. This then carries the ink, or the printed image on the pressed with a counter-pressure cylinder 37 against the printing cylinder
  • Substrates 2 which are conveyed along the direction 13 by the printing press 30. Downstream of the printing cylinder 39 in the direction of rotation 13, a coating device is arranged, as shown for example in FIG.
  • the coating device 1 accordingly comprises a coating unit 5 for the structured application of coating material, a unit 9, with which the applied paint film is smoothed, and a UV light source 10 for curing the of the Coating unit 5 optionally structured coated film of a UV-curing paint.
  • the printing machine 30 itself serves.
  • Conveyors may be provided.
  • a belt 110 running over rollers 11 is provided, on which the substrates 2 rest.
  • the printing press 30 can in particular also be retrofitted with a device 1.
  • a device 9 according to the invention can also be retrofitted.
  • the device 9 may in particular again comprise an arrangement of nozzles for generating gas streams, with which the paint film is smoothed.
  • the device 1 or the device 9 in a corresponding manner in other printing machines, such as digital printing (inkjet, toner method), screen printing, flexographic or gravure printing and pad printing machines for printing and / or
  • FIG. 3 shows a further embodiment of a coating device 1.
  • the coating can be carried out with a paint film for producing structured paint films by means of a coating unit 5, which laterally structured films produced by the drop-on-demand method.
  • a continuous band is shown in the example shown here.
  • the device 9 here comprises a needled roller 94 instead of a nozzle arrangement. As the roller rolls off, the needles contact the film of the still fluid coating material. With suitable process parameters, this leads to an efficient smoothing of the film surface.
  • Fig. 4 shows a schematic view of an embodiment of a device 9, which the still fluid paint film according to the embodiments shown in Figs. 1 and 2 by on the
  • Substrate surface directed gas flows smooth. 4 shows a view along the running direction of the substrate 2.
  • the device 9 comprises, as in the examples shown in FIGS. 1 and 2, a row of nozzles 91 which extends transversely to the running direction.
  • the nozzles are also arranged at different angles to the normal of the substrate, so that gas streams are generated by the individual nozzles, which have different angles to the substrate 2.
  • the device is, as indicated by the double arrow, moved back and forth transversely to the direction of the substrate 2, so that successively impinge the gas streams at different angles to a respective point of the film and the gas streams are rastered over the substrate surface. In this way a particularly effective smoothing is achieved.
  • the gas streams may also be pulsed and / or heated and / or acted upon by ultrasonic waves.
  • FIG. 5A shows, in a grid representation, a paint film before smoothing, as it is often obtained in particular on paper or cardboard substrates by means of drop-on-demand coating.
  • the crater-like depressions 71 are distributed over the surface of the film 7 and have a diameter dependent on the layer thickness.
  • FIG. 6 shows yet another example of a device 9.
  • the principle of the device shown here is based on a smoothing by a targeted, non-contact To achieve warming.
  • one or more radiation sources for example, as in the example shown, several lasers 95 are provided which emit radiation which is at least partially absorbed by the applied coating material or the substrate and thus heat the film.
  • the lasers 95 are pivotably arranged so that they can be scanned over the substrate surface 21 or respectively regions of the substrate surface 21.
  • the pivoting preferably also the intensity of the laser, is controlled by means of a computer 15.
  • the surface 21 can be scanned with the lasers 95 by pivoting.
  • a camera 96 is provided, which is connected to the computer 15. With the camera, any existing defects are recorded and their
  • the computer controls one or more lasers so that they heat the coating material in the area of the defect and thereby compensate for the defect.
  • a device for selectively influencing the coating surface is provided in a further development of the invention also generally, which is a
  • Detecting means for detecting the position of defects in the film preferably with a camera.
  • the defects detected by the detection device are targeted by movement or direction of the Gas stream and / or the radiation source for non-contact heating and / or at least one needle balanced.
  • FIG. 7 shows an electron micrograph of such a depression 71.
  • the measured depression in the coating shown in this example has a diameter of about 10 micrometers.
  • FIG. 8 shows a two-dimensional surface profile of another section of a paint film.
  • the surface profile was obtained by white light interferometry.
  • the section shown has a dimension of 1.24 x 0.94 millimeters.
  • two crater-like depressions can be seen.
  • 9 further shows a line profile through the larger of the two depressions (in the viewing angle of FIG. 8, this is the rear of the two depressions 71).
  • the line profile shows that the recess has an outer dimension of about 0.3 millimeters. This dimension results in an approximation of the shape of the recess as a cone or truncated cone.
  • the pinholes 71 are very deep, with a cross-section tapering towards the substrate.
  • the real depth could not be determined with white light interferometry, since the possible measuring range is exceeded.
  • the values indicated indicate that the wells reach down to the substrate, which also suggests the appearance of the wells. In general, it is precisely those depressions which can be closed by the method according to the invention.
  • the crater diameter is generally dependent on the layer thickness and can also be greater than in the example shown in FIG. 8. It is believed that these crater-like pits emanate from small chemical and / or topographic perturbations on the substrate.
  • the depression then runs up funnel-shaped. The curvature of the funnel wall is a function of the surface tension. This means that a greater layer thickness does not lead to an improvement of the
  • Craters as in the example shown in FIG. 8, are soluble above 2 ⁇ m in thickness for the human eye and disturb the appearance of a closed lacquer surface. As the layer thickness increases, its density decreases, but, as stated above, its diameter increases at the surface.
  • the targeted influencing of the film surface according to the invention is accordingly particularly suitable for closing depressions from about 2 micrometers
  • Diameter at the surface preferably 5 micrometers in diameter. Recesses from such a diameter interfere with the appearance of the paint or the coating.
  • the diameter of the crater-like depressions can, as the example shown above illustrates, extend to the surface even down to the millimeter range. Even such major disturbances can be at least partially eliminated by means of the invention.
  • a movement of the coating material over larger stretching is not carried out.
  • the coating material is laterally moved by the smoothing device by less than one millimeter, more preferably by less than 0.25 millimeters.
  • the edges to uncoated areas are preferably not affected, so that sharp contours remain at the edges.

Landscapes

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

Abstract

L'invention concerne un dispositif d'application de revêtements sur des surfaces de substrats sous forme de papier, de carton ou de feuilles plastiques, de préférence pour la finition de produits d'impression. Le dispositif comporte une unité de revêtement destinée à appliquer du matériau de revêtement sous forme fluide sur la surface du substrat, et un système de lissage de la pellicule encore fluide, appliquée sur la surface du substrat au moyen de l'unité de revêtement, ledit système comportant un dispositif de production d'un flux gazeux dirigé sur la surface du substrat revêtu de la pellicule, lissant la pellicule par suppression au moins partielle de structures indésirables de la surface de pellicule, telles que des cavités, des saillies et des cratères, avant durcissage du matériau de revêtement.
EP08785039A 2007-07-24 2008-07-24 Procédé et dispositif d'application de revêtements plastiques Active EP2183057B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007034877A DE102007034877A1 (de) 2007-07-24 2007-07-24 Verfahren und Vorrichtung zum Auftrag von Kunststoffbeschichtungen
PCT/EP2008/006086 WO2009012996A2 (fr) 2007-07-24 2008-07-24 Procédé et dispositif d'application de revêtements plastiques

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EP2183057A2 true EP2183057A2 (fr) 2010-05-12
EP2183057B1 EP2183057B1 (fr) 2012-06-06

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EP (1) EP2183057B1 (fr)
CN (1) CN101827658B (fr)
DE (1) DE102007034877A1 (fr)
ES (1) ES2385119T3 (fr)
RU (1) RU2481959C2 (fr)
WO (1) WO2009012996A2 (fr)

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Publication number Publication date
RU2481959C2 (ru) 2013-05-20
CN101827658A (zh) 2010-09-08
WO2009012996A2 (fr) 2009-01-29
RU2010106649A (ru) 2011-08-27
WO2009012996A3 (fr) 2009-05-07
US20100221449A1 (en) 2010-09-02
EP2183057B1 (fr) 2012-06-06
ES2385119T3 (es) 2012-07-18
CN101827658B (zh) 2014-04-09
DE102007034877A1 (de) 2009-01-29

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