EP0307848A1 - Method and apparatus for hardening layers applied to an article - Google Patents

Method and apparatus for hardening layers applied to an article Download PDF

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Publication number
EP0307848A1
EP0307848A1 EP88114925A EP88114925A EP0307848A1 EP 0307848 A1 EP0307848 A1 EP 0307848A1 EP 88114925 A EP88114925 A EP 88114925A EP 88114925 A EP88114925 A EP 88114925A EP 0307848 A1 EP0307848 A1 EP 0307848A1
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EP
European Patent Office
Prior art keywords
radiation
sleeve
air
annular space
drying
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Granted
Application number
EP88114925A
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German (de)
French (fr)
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EP0307848B1 (en
Inventor
Volker Dipl.-Ing. Schaft
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Individual
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Individual
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B3/00—Drying solid materials or objects by processes involving the application of heat
    • F26B3/28—Drying solid materials or objects by processes involving the application of heat by radiation, e.g. from the sun
    • F26B3/283—Drying solid materials or objects by processes involving the application of heat by radiation, e.g. from the sun in combination with convection
    • 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
    • B05D3/0263—After-treatment with IR heaters
    • 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
    • B05D3/0486—Operating the coating or treatment in a controlled atmosphere
    • 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
    • B05D3/061—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 using U.V.
    • B05D3/065—After-treatment
    • B05D3/067—Curing or cross-linking the coating
    • 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
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/50—Multilayers
    • B05D7/52—Two layers
    • B05D7/53—Base coat plus clear coat type
    • B05D7/536—Base coat plus clear coat type each layer being cured, at least partially, separately
    • 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
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/50—Multilayers
    • B05D7/56—Three layers or more
    • B05D7/57—Three layers or more the last layer being a clear coat
    • B05D7/576—Three layers or more the last layer being a clear coat each layer being cured, at least partially, separately
    • 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
    • B05D2252/02—Sheets of indefinite length

Definitions

  • the invention relates to a method and a device for hardening by drying and / or setting layers, such as printing inks, laminations or the like, which are continuously applied to one another on a body, the bottom pigment-containing layers being subjected to heat treatment by IR radiation and the top or Cover layer, which forms a lamination, is exposed to UV radiation.
  • drying and / or setting layers such as printing inks, laminations or the like
  • IR reactive inks are being used more and more in the printing industry. These paints and varnishes dry very quickly on the surface when irradiated with IR light and are therefore "dry” and “dust dry".
  • substrates such as paper and cardboard printed with such inks, e.g. B. their surface quality by an acrylate
  • the IR-reactive ink must be completely dry, otherwise the print image will deteriorate due to the fact that the non-dried ink components run under the lamination in the carrier material; because in extreme cases the drying of IR-reactive colors can take a few hours.
  • the object of the invention is to provide a method and an apparatus with which IR-reactive inks are dried so intensively that the aftertreatment of the printed carrier material, for. B. its lamination directly, d. H. can be carried out without a transition period after the IR treatment without impairing the printed image.
  • This object is achieved according to the invention, starting from a method described at the outset NEN genus, solved in that the air is sucked off above the area of the coated body which is subject to UV radiation and blown into the IR drying device in the area of the body which is subject to the IR radiation.
  • the IR-reactive printing ink to be dried By sucking off the air according to the invention from the area of the coated body exposed to UV radiation and exposing the area of the body exposed to IR radiation to this sucked-off air, the IR-reactive printing ink to be dried also becomes ozone in addition to the IR radiation enriched air.
  • the oxidation processes taking place during drying of the ink are accelerated in such a way that the ink dries through in the shortest possible time and the print image is not negatively changed by the lamination.
  • the additional enrichment of the surroundings of the area of the printed body exposed to IR radiation with ozone continues to have an effect that the solvents expelled from the paint by the IR radiation are oxidized and thereby converted into substances not harmful to the environment.
  • An apparatus for carrying out the method according to the invention consists of an IR drying device which is provided behind the last printing unit of a printing press which applies IR-reactive colors, and of an UV radiation device which is the application device for a printing ink to be treated with IR lacquer-like UV-reactive coating is arranged downstream, and is characterized in that the exhaust air from the UV radiation device is fed into the IR drying device.
  • the new device makes it possible to carry out the method according to the invention for hardening layers applied to a body with little effort in existing printing machines by inserting the exhaust air line of the UV radiation device into the IR drying device.
  • the exhaust air line of the UV radiation device into the IR drying device.
  • aftertreatment devices for the exhaust air from the IR drying device which is the entire exhaust air of the printing press, with which, in particular, the solvents expelled from the ink are separated, which reduces the operating costs of the printing press with increased printing performance due to the rapid Drying of the color in the IR drying device contributes.
  • the IR drying device is seen in the transport direction of the printing press - behind an IR Radiation body an ozone generator, preferably a rod-shaped high-pressure gas discharge lamp, in particular a mercury vapor lamp, which is surrounded by a metal or ceramic sleeve to form an annular space, the wall of which has openings from which air blown into the annular space, preferably part of the exhaust air from the UV radiation device escapes in the direction of the color layer (s) to be treated.
  • an ozone generator preferably a rod-shaped high-pressure gas discharge lamp, in particular a mercury vapor lamp, which is surrounded by a metal or ceramic sleeve to form an annular space, the wall of which has openings from which air blown into the annular space, preferably part of the exhaust air from the UV radiation device escapes in the direction of the color layer (s) to be treated.
  • the printing ink is not only exposed to additional IR radiation, which is emitted by the sleeve heated by the mercury vapor lamp.
  • additional measures according to the invention also increase the ozone content in the IR drying device resulting from the exhaust air from the UV radiation device. This additional With the air from the annular space between the sleeve and the mercury vapor lamp, ozone reaches the IR drying device through the openings in the sleeve wall and is blown against the surface of the printed body. The ozone is formed in the annulus from the atmospheric oxygen due to the UV radiation emitted by the mercury lamp.
  • a suction device can also act on the area between the IR radiation body and the gas discharge lamp in the IR drying device, which contributes to the ozone coming into intimate contact with the paint to be dried.
  • the body 7 to be printed or coated enters in the direction of arrow C in the last printing unit 10 for IR-reactive colors at the discharge 1 and leaves it in the direction of arrow D.
  • the body 7 passes guide rollers 11 and passes an IR drying device 12, a squeezing and blowing device 23, an application device 13 for a UV reactive acrylic coating and a UV radiation device 14.
  • an IR radiation body 15 directed towards the body 7 and an ozone generator 21, the structure of which is explained below with reference to FIGS. 2 and 3, are arranged.
  • the mouth 16 of an air line 17, into which a blower 18 is inserted, and whose inlet opening 19 is located in the UV radiation device 14, also projects into this IR drying device 12.
  • the air is discharged from the IR drying device 12 into the environment via an exhaust duct 20 in the direction of arrow E.
  • the UV radiation device 14 has two high-pressure gas discharge lamps 22 which illuminate the body 7.
  • the IR drying device 12 consists of a ceramic sleeve 1, in which a rod-shaped mercury vapor lamp 2 is arranged concentrically.
  • a ceramic sleeve 1 On the outside of the sleeve 1, the length of which corresponds to that of the mercury vapor lamp 2, an air collection duct 3 is attached, which is connected via air inlet openings 4 in the wall of the sleeve 1 to an annular space 5, which is delimited by the sleeve 1 and the mercury vapor lamp 2 .
  • a slot-shaped air outlet opening 6 which extends over the entire length of the sleeve 1 and is directed toward the body 7 printed and guided in the direction of arrow A, is also incorporated into the wall of the sleeve 1.
  • the rod-shaped mercury vapor lamp 2 is eccentric in the ceramic sleeve 1, the length of which coincides substantially with that of the lamp 2, and the air collection duct 3 with respect to that in the direction of arrow A am Ozone generator 21 passed body 7 laterally attached to the sleeve 1.
  • the air collection duct 3 is connected via air inlet openings 4 in the wall of the sleeve 1 to the annular space 5, which merges into a duct 8 via a gap-shaped opening 6 approximately opposite the air inlet openings 4.
  • This channel 8 is zigzag-shaped and curved on the outside along the area of the ceramic sleeve 1 facing away from the paint layer (s) to be treated and has an outlet 9 directed towards this paint layer (s) and designed as a blowing nozzle .
  • the high-pressure gas discharge lamps 22 in the UV radiation device 14 not only emit UV light, which triggers the curing reaction of the acrylate coating. They also create an atmosphere enriched with ozone, since only a part of the ozone formed from the atmospheric oxygen under the influence of UV radiation reacts with the acrylate coating when it hardens. This excess ozone is - instead of as a pollutant in the environment - extracted according to the invention with the air from the UV radiation device 14 by the fan 18 and fed through the air line 17 into the IR drying device 12, where it is dried by the IR-reactive printing ink radiation emitted by the IR radiation body 15 is reacted as a reactive oxidizing agent.
  • the ozone generator 21 In addition to IR radiation body 15 and to the ozone from the UV radiation device 14, the ozone generator 21 also contributes to drying the IR-reactive paint and in particular to the oxidation of the expelled solvents in the IR drying device 12 by the wall of the sleeve heated by the mercury vapor lamp 2 1 of the ozone generator 21 on the moving body 7 sends an IR radiation. Ambient air is blown into the air collection duct 3 at the same time with a blower (not shown), which passes through the air inlet openings 4 into the annular space 5, in which it is exposed to the UV radiation from the mercury vapor lamp 2. This UV radiation converts part of the atmospheric oxygen into ozone.
  • the air now enriched with ozone leaves the annular space 5 via the air outlet openings 6 and hits the colored surfaces of the body 7 to be dried in the direction of the arrows B.
  • an essentially solvent-free atmosphere forms in the space between the IR radiation body 15 and the ozone generator 21 in the IR drying device 12, since the solvent which is released when the IR-reactive colors dry is converted into harmless products, in particular by the ozone becomes.
  • the exhaust gases of the IR drying device 12 are consequently discharged into the environment free of pollutants with a suction device, not shown, via the exhaust duct 22 in the direction of the arrow E.
  • the air exposed to the UV radiation in the annular space 5 only hits the color layer (s) to be treated after passage through the labyrinthine channel 8, which increases the ozone-forming effect of the UV radiation, which is directed into the channel 8 by reflections via the air outlet opening 6 will contribute.
  • the rear area of the sleeve 1 with respect to the coated body 7 is cooled by the channel arrangement according to the invention. It is at the same time achieved that the area of the sleeve 1 opposite the body and acting as an IR radiator is only slightly cooled by the air blown against the body 7 from the outlet 9 of the channel 8 and is thus hardly impaired in its radiation intensity.
  • the printed body 7 Before the printed body 7 enters the application device 13 for acrylate coating, it passes through the squeezing and blowing device 23, in which ozone still adhering to the dry IR-reactive printing ink is removed.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Microbiology (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)
  • Drying Of Solid Materials (AREA)
  • Printing Methods (AREA)

Abstract

Zum Härten durch Trocknen und/oder Abbinden von auf einem Körper (7) kontinuierlich übereinander aufgetragenen Schichten wie Druckfarben, Kaschierungen oder dgl., werden die untersten pigmenthaltigen Schichten einer Wärmebehandlung durch IR-Strahlung unterzogen (12) und die oberste oder Deckschicht, die eine Kaschierung bildet, einer UV-Strahlung ausgesetzt (14). Dabei wird die Luft oberhalb des der UV-Strahlung unterliegenden Bereiches des Körpers abgesaugt und auf den Bereich des Körpers geblasen.For hardening by drying and / or setting layers such as printing inks, laminations or the like which are continuously applied to one another on a body (7), the lowermost pigment-containing layers are subjected to heat treatment by IR radiation (12) and the top or top layer, which is a Lamination forms, exposed to UV radiation (14). The air above the area of the body that is subject to UV radiation is extracted and blown onto the area of the body.

Description

Die Erfindung betrifft ein Verfahren und eine Vor­richtung zum Härten durch Trocknen und/oder Abbin­den von auf einem Körper kontinuierlich übereinan­der aufgetragenen Schichten, wie Druckfarben, Kaschierungen oder dgl., wobei die untersten pig­menthaltigen Schichten einer Wärmebehandlung durch IR-Strahlung unterzogen werden und die oberste oder Deckschicht, die eine Kaschierung bildet, einer UV-Strahlung ausgesetzt wird.The invention relates to a method and a device for hardening by drying and / or setting layers, such as printing inks, laminations or the like, which are continuously applied to one another on a body, the bottom pigment-containing layers being subjected to heat treatment by IR radiation and the top or Cover layer, which forms a lamination, is exposed to UV radiation.

In der Druckindustrie gelangen IR-reaktive Farben immer häufiger zum Einsatz. Diese Farben und Lacke trocknen bei Bestrahlung mit IR-Licht recht schnell an der Oberfläche und sind somit "griff-" und "staubtrocken". Um mit derartigen Farben bedruckte Träger wie Papiere und Kartons weiterbehandeln, z. B. deren Oberflächenqualität durch eine Acrylat­ kaschierung anheben zu können, muß die IR-­reaktive Farbe vollständig durchgetrocknet sein, da sich anderenfalls das Druckbild verschlechtert, indem die nicht getrockne­ten Farbanteile unter der Kaschierung im Trägermaterial verlaufen; denn das Durch­trocknen IR-reaktiver Farben kann in Extrem­fällen einige Stunden dauern.IR reactive inks are being used more and more in the printing industry. These paints and varnishes dry very quickly on the surface when irradiated with IR light and are therefore "dry" and "dust dry". In order to further treat substrates such as paper and cardboard printed with such inks, e.g. B. their surface quality by an acrylate To be able to lift the lamination, the IR-reactive ink must be completely dry, otherwise the print image will deteriorate due to the fact that the non-dried ink components run under the lamination in the carrier material; because in extreme cases the drying of IR-reactive colors can take a few hours.

Aufgabe der Erfindung ist es nun, ein Verfah­ren und eine Vorrichtung zu schaffen, mit der IR-reaktive Farben derart intensiv getrocknet werden, daß die Nachbehandlung des bedruckten Trägermaterials, z. B. dessen Kaschierung un­mittelbar, d. h. ohne Übergangszeit nach der IR-Behandlung ohne Beeinträchtigung des Druck­bildes vorgenommen werden kann.The object of the invention is to provide a method and an apparatus with which IR-reactive inks are dried so intensively that the aftertreatment of the printed carrier material, for. B. its lamination directly, d. H. can be carried out without a transition period after the IR treatment without impairing the printed image.

Diese Aufgabe wird erfindungsgemäß, ausgehend von einem Verfahren der eingangs beschriebe­ nen Gattung, dadurch gelöst, daß die Luft ober­halb des der UV-Strahlung unterliegenden Berei­ches des beschichteten Körpers abgesaugt und in die IR-Trockeneinrichtung im Bereich des Körpers geblasen wird, der der IR-Strahlung unterliegt.This object is achieved according to the invention, starting from a method described at the outset NEN genus, solved in that the air is sucked off above the area of the coated body which is subject to UV radiation and blown into the IR drying device in the area of the body which is subject to the IR radiation.

Durch das erfindungsgemäße Absaugen der Luft aus dem einer UV-Strahlung ausgesetzten Bereich des beschichteten Körpers und dem Aussetzen des der IR-Strahlung unterliegenden Bereiches des Kör­pers dieser abgesaugten Luft wird die zu trock­nende IR-reaktive Druckfarbe zusätzlich zur IR-­Strahlung auch noch von mit Ozon angereicherter Luft beaufschlagt. Durch diese Maßnahme werden die beim Trocknen der Farbe stattfindenden Oxi­dationsprozesse derart beschleunigt, daß die Farbe in kürzester Zeit durchtrocknet und das Druckbild durch die Kaschierung nicht negativ verändert wird. Die zusätzliche Anreicherung der Umgebung des der IR-Strahlung ausgesetzten Bereiches des bedruckten Körpers mit Ozon be­ wirkt weiter, daß die durch die IR-Strahlung aus der Farbe ausgetriebenen Lösungsmittel oxidiert und dadurch in die Umwelt nicht belastende Stof­fe umgewandelt werden.By sucking off the air according to the invention from the area of the coated body exposed to UV radiation and exposing the area of the body exposed to IR radiation to this sucked-off air, the IR-reactive printing ink to be dried also becomes ozone in addition to the IR radiation enriched air. As a result of this measure, the oxidation processes taking place during drying of the ink are accelerated in such a way that the ink dries through in the shortest possible time and the print image is not negatively changed by the lamination. The additional enrichment of the surroundings of the area of the printed body exposed to IR radiation with ozone continues to have an effect that the solvents expelled from the paint by the IR radiation are oxidized and thereby converted into substances not harmful to the environment.

Eine Vorrichtung zur Durchführung des Verfahrens nach der Erfindung besteht aus einer IR-Trocken­einrichtung, die hinter dem letzten IR-reaktiven Farben auftragenden Druckwerk einer Druckmaschine vorgesehen ist, und aus einer UV-Strahlungsein­richtung, die der Auftragseinrichtung für eine auf die IR-behandelten Druckfarben aufzubringen­de lackartige UV-reaktive Beschichtung nachgeord­net ist, und ist dadurch gekennzeichnet, daß die Abluft aus der UV-Strahlungseinrichtung in die IR-Trockeneinrichtung eingespeist wird.An apparatus for carrying out the method according to the invention consists of an IR drying device which is provided behind the last printing unit of a printing press which applies IR-reactive colors, and of an UV radiation device which is the application device for a printing ink to be treated with IR lacquer-like UV-reactive coating is arranged downstream, and is characterized in that the exhaust air from the UV radiation device is fed into the IR drying device.

Die neue Vorrichtung ermöglicht die Durchführung des erfindungsgemäßen Verfahrens zum Härten von auf einem Körper aufgetragenen Schichten ohne großen Aufwand bei vorhandenen Druckmaschinen, indem die Abluftleitung der UV-Strahlungsein­richtung in die IR-Trockeneinrichtung einge­führt wird. Zugleich kann für die Abluft aus der IR-Trockeneinrichtung, die die gesamte Ab­luft der Druckmaschine ist, auf Nachbehandlungs­geräte, mit denen insbesondere die aus der Farbe ausgetriebenen Lösungsmittel abgeschie­den werden, verzichtet werden, was zur Senkung der Betriebskosten der Druckmaschine bei ge­steigerter Druckleistung durch die rasche Trock­nung der Farbe in der IR-Trockeneinrichtung bei­trägt.The new device makes it possible to carry out the method according to the invention for hardening layers applied to a body with little effort in existing printing machines by inserting the exhaust air line of the UV radiation device into the IR drying device. At the same time, there is no need for aftertreatment devices for the exhaust air from the IR drying device, which is the entire exhaust air of the printing press, with which, in particular, the solvents expelled from the ink are separated, which reduces the operating costs of the printing press with increased printing performance due to the rapid Drying of the color in the IR drying device contributes.

Um die vom Ozon bzw. aktiven Sauerstoff der Ab­luft aus der UV-Strahlungseinrichtung ausgehen­den positiven Effekte auf die Trocknung der IR-reaktiven Farben zu verbessern oder sicher­zustellen, ist in einer bevorzugten Ausführungs­form der erfindungsgemäßen Vorrichtung in der IR-Trockeneinrichtung - in Transportrichtung der Druckmaschine gesehen - hinter einem IR-­ Strahlungskörper ein Ozonerzeuger, vorzugswei­se eine stabförmige Hochdruck-Gasentladungs­lampe, insbesondere eine Quecksilberdampflam­pe angeordnet, die unter Bildung eines Ring­raumes von einer Metall- oder Keramikhülse um­geben ist, deren Wandung Öffnungen aufweist, aus denen in den Ringraum eingeblasene Luft, vorzugsweise ein Teil der Abluft aus der UV-­Strahlungseinrichtung, in Richtung auf die zu behandelnde(n) Farbschicht(en) entweicht. Durch die Anordnung dieser besonders ausgestal­teten Hochdruckgasentladungslampe innerhalb der IR-Trockeneinrichtung wird die Druckfarbe nicht nur einer zusätzlichen IR-Strahlung, die von der von der Quecksilberdampflampe erhitzten Hülse ausgesandt wird, ausgesetzt. Durch diese zusätzlichen erfindungsgemäßen Maßnahmen wird auch noch der aus der Abluft der UV-Strahlungs­einrichtung herrührende Ozongehalt in der IR-­Trockeneinrichtung erhöht. Dieses zusätzliche Ozon gelangt mit der Luft aus dem Ringraum zwischen Hülse und Quecksilberdampflampe über die Öffnungen in der Hülsenwand in die IR-Trockeneinrichtung und wird gegen die Oberfläche des bedruckten Körpers geblasen. Das Ozon wird dabei im Ringraum aus dem Luft­sauerstoff aufgrund der von der Quecksilber­dampflampe ausgehenden UV-Strahlung gebildet. Dabei kann in der IR-Trockeneinrichtung auf den Bereich zwischen IR-Strahlungskörper und Gasentladungslampe noch eine Absaugeinrich­tung einwirken, was dazu beiträgt, daß das Ozon mit der zu trocknenden Farbe in innige Berührung kommt.In order to improve or ensure the positive effects on the drying of the IR-reactive inks emanating from the ozone or active oxygen in the exhaust air from the UV radiation device, in a preferred embodiment of the device according to the invention the IR drying device is seen in the transport direction of the printing press - behind an IR Radiation body an ozone generator, preferably a rod-shaped high-pressure gas discharge lamp, in particular a mercury vapor lamp, which is surrounded by a metal or ceramic sleeve to form an annular space, the wall of which has openings from which air blown into the annular space, preferably part of the exhaust air from the UV radiation device escapes in the direction of the color layer (s) to be treated. By arranging this specially designed high-pressure gas discharge lamp within the IR drying device, the printing ink is not only exposed to additional IR radiation, which is emitted by the sleeve heated by the mercury vapor lamp. These additional measures according to the invention also increase the ozone content in the IR drying device resulting from the exhaust air from the UV radiation device. This additional With the air from the annular space between the sleeve and the mercury vapor lamp, ozone reaches the IR drying device through the openings in the sleeve wall and is blown against the surface of the printed body. The ozone is formed in the annulus from the atmospheric oxygen due to the UV radiation emitted by the mercury lamp. A suction device can also act on the area between the IR radiation body and the gas discharge lamp in the IR drying device, which contributes to the ozone coming into intimate contact with the paint to be dried.

Weitere zweckmäßige Ausgestaltungen der er­findungsgemäßen Vorrichtung, insbesondere des Ozonerzeugers in der Trockeneinrichtung, sind in Unteransprüchen angegeben.Further expedient refinements of the device according to the invention, in particular of the ozone generator in the drying device, are specified in the subclaims.

Ein Ausführungsbeispiel der erfindungsgemäßen Vorrichtung wird noch an Hand der Zeichnungen beschrieben. Es stellen dar:

  • Fig. 1 eine schematische Seitenansicht des Austragendes einer Rotationsdruckma­schine,
  • Fig. 2 eine schematische Schnittansicht durch den in der IR-Trockeneinrichtung der Druckmaschine nach Fig. 1 eingefügten Ozonerzeuger,
  • Fig. 3 eine schematische Schnittansicht durch einen anderen in der IR-Trockeneinrich­tung der Druckmaschine nach Fig. 1 ein­gesetzten Ozonerzeuger.
An embodiment of the invention Device will be described with reference to the drawings. They represent:
  • 1 is a schematic side view of the discharge end of a rotary printing press,
  • 2 shows a schematic sectional view through the ozone generator inserted in the IR drying device of the printing press according to FIG. 1,
  • 3 is a schematic sectional view through another ozone generator used in the IR drying device of the printing machine according to FIG. 1.

Der zu bedruckende bzw. zu beschichtende Körper 7 tritt in Richtung des Pfeiles C in das letzte Druckwerk 10 für IR-reaktive Farben am Austrags­ ende der in Fig. 1 dargestellten Druckmaschine ein und verläßt diese in Richtung des Pfeiles D. Auf diesem Weg läuft der Körper 7 an Füh­rungsrollen 11 vorbei und passiert eine IR-­Trockeneinrichtung 12, eine Quetsch- und Blas­einrichtung 23, eine Auftragseinrichtung 13 für eine UV-reaktive Acrylatbeschichtung sowie eine UV-Strahlungseinrichtung 14.The body 7 to be printed or coated enters in the direction of arrow C in the last printing unit 10 for IR-reactive colors at the discharge 1 and leaves it in the direction of arrow D. In this way, the body 7 passes guide rollers 11 and passes an IR drying device 12, a squeezing and blowing device 23, an application device 13 for a UV reactive acrylic coating and a UV radiation device 14.

In der IR-Trockeneinrichtung 12 sind ein auf den Körper 7 gerichteter IR-Strahlungskörper 15 und ein Ozonerzeuger 21, dessen Aufbau un­ten an Hand der Fig. 2 und 3 erläutert wird, angeordnet. In diese IR-Trockeneinrichtung 12 ragt weiter die Mündung 16 einer Luftleitung 17, in die ein Gebläse 18 eingefügt ist, und deren Eintrittsöffnung 19 sich in der UV-Strah­lungseinrichtung 14 befindet. Die Luft wird aus der IR-Trockeneinrichtung 12 über einen Abgas­kanal 20 in Richtung des Pfeiles E in die Um­gebung abgeleitet.In the IR drying device 12, an IR radiation body 15 directed towards the body 7 and an ozone generator 21, the structure of which is explained below with reference to FIGS. 2 and 3, are arranged. The mouth 16 of an air line 17, into which a blower 18 is inserted, and whose inlet opening 19 is located in the UV radiation device 14, also projects into this IR drying device 12. The air is discharged from the IR drying device 12 into the environment via an exhaust duct 20 in the direction of arrow E.

Die UV-Strahlungseinrichtung 14 weist zwei Hoch­druckgasentladungslampen 22 auf, die den Körper 7 anstrahlen.The UV radiation device 14 has two high-pressure gas discharge lamps 22 which illuminate the body 7.

Der Ozonerzeuger 21 gemäß Fig. 2 der IR-Trocken­einrichtung 12 besteht aus einer Keramikhülse 1, in der konzentrisch eine stabförmige Quecksilber­dampflampe 2 angeordnet ist. Außen ist auf der Hülse 1, deren Länge mit derjenigen der Quecksil­berdampflampe 2 übereinstimmt, ein Luftsammelka­nal 3 angebracht, der über Lufteintrittsöffnun­gen 4 in der Wandung der Hülse 1 mit einem Ring­raum 5, der von der Hülse 1 und der Quecksilber­dampflampe 2 begrenzt wird, verbunden ist. Den Lufteintrittsöffnungen 4 gegenüberliegend ist in die Wandung der Hülse 1 noch eine sich über die gesamte Länge der Hülse 1 erstreckende schlitz­förmige Luftaustrittsöffnung 6 eingearbeitet, die auf den in Richtung des Pfeiles A vorbeige­führten und bedruckten Körper 7 gerichtet ist.2 of the IR drying device 12 consists of a ceramic sleeve 1, in which a rod-shaped mercury vapor lamp 2 is arranged concentrically. On the outside of the sleeve 1, the length of which corresponds to that of the mercury vapor lamp 2, an air collection duct 3 is attached, which is connected via air inlet openings 4 in the wall of the sleeve 1 to an annular space 5, which is delimited by the sleeve 1 and the mercury vapor lamp 2 . Opposite the air inlet openings 4, a slot-shaped air outlet opening 6, which extends over the entire length of the sleeve 1 and is directed toward the body 7 printed and guided in the direction of arrow A, is also incorporated into the wall of the sleeve 1.

Bei dem in Fig. 3 dargestellten Ozonerzeuger 21 der IR-Trockeneinrichtung 12 ist die stabförmi­ge Quecksilberdampflampe 2 exzentrisch in der Keramikhülse 1, deren Länge im wesentlichen mit derjenigen der Lampe 2 übereinstimmt, und der Luftsammelkanal 3 in bezug auf den in Richtung des Pfeiles A am Ozonerzeuger 21 vorbeigeführ­ten Körper 7 seitlich an der Hülse 1 angebracht. Der Luftsammelkanal 3 steht über Lufteintritts­öffnungen 4 in der Wandung der Hülse 1 mit dem Ringraum 5 in Verbindung, der über eine etwa den Lufteintrittsöffnungen 4 gegenüberliegende spaltförmige Öffnung 6 in einen Kanal 8 über­geht. Dieser Kanal 8 ist zick-zack-förmig und gekrümmt außen an dem in bezug auf die zu be­handelnde(n) Farbschicht(en) abgewandten Be­reich der Keramikhülse 1 entlanggeführt und weist einen auf diese Farbschicht(en) gerichte­ten sowie als Blasdüse ausgebildeten Auslaß 9 auf.In the ozone generator 21 of the IR drying device 12 shown in FIG. 3, the rod-shaped mercury vapor lamp 2 is eccentric in the ceramic sleeve 1, the length of which coincides substantially with that of the lamp 2, and the air collection duct 3 with respect to that in the direction of arrow A am Ozone generator 21 passed body 7 laterally attached to the sleeve 1. The air collection duct 3 is connected via air inlet openings 4 in the wall of the sleeve 1 to the annular space 5, which merges into a duct 8 via a gap-shaped opening 6 approximately opposite the air inlet openings 4. This channel 8 is zigzag-shaped and curved on the outside along the area of the ceramic sleeve 1 facing away from the paint layer (s) to be treated and has an outlet 9 directed towards this paint layer (s) and designed as a blowing nozzle .

Im folgenden wird noch kurz die Arbeitsweise der erfindungsgemäßen Vorrichtung erläutert:The mode of operation of the device according to the invention is briefly explained below:

Die Hochdruckgasentladungslampen 22 in der UV-­Strahlungseinrichtung 14 senden nicht nur UV-­Licht aus, das die Aushärtreaktion der Acrylat­beschichtung auslöst. Sie schaffen auch eine mit Ozon angereicherte Atmosphäre, da nur ein Teil des unter der Einwirkung der UV-Strahlung aus dem Luftsauerstoff gebildeten Ozons mit der Acrylatbeschichtung bei deren Aushärten reagiert. Dieses überschüssige Ozon wird - anstatt als Schadstoff in die Umgebung - erfindungsgemäß mit der Luft aus der UV-Strahlungseinrichtung 14 vom Gebläse 18 abgesaugt und durch die Luft­leitung 17 in die IR-Trockeneinrichtung 12 ein­gespeist, wo es beim Trocknen der IR-reaktiven Druckfarbe durch die vom IR-Strahlungskörper 15 emittierte Strahlung als reaktionsfreudiges Oxidationsmittel umgesetzt wird. Zusätzlich zum IR-Strahlungskörper 15 und zum Ozon aus der UV-Strahlungseinrichtung 14 trägt noch der Ozonerzeuger 21 zum Trocknen der IR-reaktiven Farbe und insbesondere zur Oxidation der aus­getriebenen Lösungsmittel in der IR-Trocken­einrichtung 12 bei, indem die von der Queck­silberdampflampe 2 erhitzte Wandung der Hülse 1 des Ozonerzeugers 21 auf dem sich bewegen­den Körper 7 eine IR-Strahlung sendet. In den Luftsammelkanal 3 wird gleichzeitig mit einem nicht dargestellten Gebläse Umgebungsluft ein­geblasen, die über die Lufteintrittsöffnungen 4 in den Ringraum 5 gelangt, in dem sie der UV-Strahlung der Quecksilberdampflampe 2 aus­gesetzt ist. Diese UV-Strahlung wandelt einen Teil des Luftsauerstoffes in Ozon um. Die nun­mehr mit Ozon angereicherte Luft verläßt den Ringraum 5 über die Luftaustrittsöffnungen 6 und trifft in Richtung der Pfeile B auf die zu trocknenden Farbflächen des Körpers 7. Dadurch bildet sich im Raum zwischen dem IR-Strahlungs­körper 15 und dem Ozonerzeuger 21 in der IR-­Trockeneinrichtung 12 eine im wesentlichen lö­sungsmittelfreie Atmosphäre aus, da das Lösungs­mittel, das beim Trocknen der IR-reaktiven Far­ben freigesetzt wird, insbesondere durch das Ozon in unschädliche Produkte umgewandelt wird. Die Abgase der IR-Trockeneinrichtung 12 werden folglich schadstofffrei mit einer nicht gezeig­ten Absaugeinrichtung über den Abgaskanal 22 in Richtung des Pfeiles E in die Umgebung abgelei­tet.The high-pressure gas discharge lamps 22 in the UV radiation device 14 not only emit UV light, which triggers the curing reaction of the acrylate coating. They also create an atmosphere enriched with ozone, since only a part of the ozone formed from the atmospheric oxygen under the influence of UV radiation reacts with the acrylate coating when it hardens. This excess ozone is - instead of as a pollutant in the environment - extracted according to the invention with the air from the UV radiation device 14 by the fan 18 and fed through the air line 17 into the IR drying device 12, where it is dried by the IR-reactive printing ink radiation emitted by the IR radiation body 15 is reacted as a reactive oxidizing agent. In addition to IR radiation body 15 and to the ozone from the UV radiation device 14, the ozone generator 21 also contributes to drying the IR-reactive paint and in particular to the oxidation of the expelled solvents in the IR drying device 12 by the wall of the sleeve heated by the mercury vapor lamp 2 1 of the ozone generator 21 on the moving body 7 sends an IR radiation. Ambient air is blown into the air collection duct 3 at the same time with a blower (not shown), which passes through the air inlet openings 4 into the annular space 5, in which it is exposed to the UV radiation from the mercury vapor lamp 2. This UV radiation converts part of the atmospheric oxygen into ozone. The air now enriched with ozone leaves the annular space 5 via the air outlet openings 6 and hits the colored surfaces of the body 7 to be dried in the direction of the arrows B. As a result an essentially solvent-free atmosphere forms in the space between the IR radiation body 15 and the ozone generator 21 in the IR drying device 12, since the solvent which is released when the IR-reactive colors dry is converted into harmless products, in particular by the ozone becomes. The exhaust gases of the IR drying device 12 are consequently discharged into the environment free of pollutants with a suction device, not shown, via the exhaust duct 22 in the direction of the arrow E.

Beim Ozonerzeuger nach Fig. 3 trifft die der UV-Strahlung im Ringraum 5 ausgesetzte Luft erst nach der Passage durch den labyrinthförmigen Ka­nal 8 auf die zu behandelnde(n) Farbschicht(en), was zur Steigerung des Ozon bildenden Effektes der UV-Strahlung, die durch Reflexionen über die Luftaustrittsöffnung 6 in den Kanal 8 gelenkt wird, beiträgt. Der in bezug auf den beschichte­ten Körper 7 rückwärtige Bereich der Hülse 1 wird durch die erfindungsgemäße Kanalanordnung gekühlt. Dabei wird zugleich erreicht, daß der dem Körper gegenüberliegende und als IR-Strahler wirkende Bereich der Hülse 1 durch die aus dem Auslaß 9 des Kanales 8 gegen den Körper 7 geblasene Luft nur eine geringfügige Abkühlung erfährt und so­mit in seiner Strahlungsintensität kaum beein­trächtigt wird.3, the air exposed to the UV radiation in the annular space 5 only hits the color layer (s) to be treated after passage through the labyrinthine channel 8, which increases the ozone-forming effect of the UV radiation, which is directed into the channel 8 by reflections via the air outlet opening 6 will contribute. The rear area of the sleeve 1 with respect to the coated body 7 is cooled by the channel arrangement according to the invention. It is at the same time achieved that the area of the sleeve 1 opposite the body and acting as an IR radiator is only slightly cooled by the air blown against the body 7 from the outlet 9 of the channel 8 and is thus hardly impaired in its radiation intensity.

Bevor der bedruckte Körper 7 in die Auftragsein­richtung 13 zur Acrylatbeschichtung eintritt, passiert er die Quetsch- und Blaseinrichtung 23, in der insbesondere an der trockenen IR-reakti­ven Druckfarbe noch anhaftendes Ozon entfernt wird.Before the printed body 7 enters the application device 13 for acrylate coating, it passes through the squeezing and blowing device 23, in which ozone still adhering to the dry IR-reactive printing ink is removed.

Claims (10)

1. Verfahren zum Härten durch Trocknen und/oder Abbinden von auf einem Körper kontinuierlich übereinander aufgetragenen Schichten wie Druck­farben, Kaschierungen oder dgl., wobei die un­tersten pigmenthaltigen Schichten einer Wärme­behandlung durch IR-Strahlung unterzogen wer­den und die oberste oder Deckschicht, die eine Kaschierung bildet, einer UV-Strahlung ausge­setzt wird, dadurch gekennzeichnet, daß die Luft oberhalb des der UV-Strahlung unterlie­genden Bereiches des Körpers absaugt und auf den Bereich des Körpers geblasen wird, der der IR-Strahlung unterliegt.1. A method for hardening by drying and / or setting layers, such as printing inks, laminations or the like, which are continuously applied to one another on a body, the bottom pigment-containing layers being subjected to heat treatment by IR radiation and the top or top layer forming a lamination , is exposed to UV radiation, characterized in that the air is sucked off above the region of the body which is subject to UV radiation and is blown onto the region of the body which is subject to IR radiation. 2. Vorrichtung zur Durchführung des Verfahrens nach Anspruch 1, bestehend aus einer IR-Trocken­einrichtung, die hinter dem letzten IR-reaktive Farben auftragenden Druckwerk einer Druckma­schine vorgesehen ist, und aus einer UV-Strah­lungseinrichtung, die der Auftragseinrichtung für eine auf die IR-behandelten Druckfarben auf­zubringende lackartige UV-reaktive Beschichtung nachgeordnet ist, dadurch gekennzeichnet, daß die Abluft aus der UV-Strahlungseinrichtung (14) in die IR-Trockeneinrichtung (12) einge­speist wird.2. Device for performing the method according to claim 1, consisting of an IR drying device, which is behind the last IR-reactive Color-applying printing unit of a printing machine is provided, and from a UV radiation device, which is arranged downstream of the application device for a varnish-like UV-reactive coating to be applied to the IR-treated printing inks, characterized in that the exhaust air from the UV radiation device (14) in the IR drying device (12) is fed. 3. Vorrichtung nach Anspruch 2, dadurch gekenn­zeichnet, daß in der IR-Trockeneinrichtung (12) - in Transportrichtung der Druckmaschine gesehen - hinter einem IR-Strahlungskörper (15) ein Ozonerzeuger (21), vorzugsweise eine stabförmige Hochdruck-Gasentladungslampe (2) wie eine Quecksilberdampflampe angeordnet ist, die unter Bildung eines Ringraumes (5) von ei­ner Metall- oder Keramikhülse (1) umgeben ist, deren Wandung Öffnungen (6) aufweist, aus de­ nen in den Ringraum (5) eingeblasene Luft in Richtung auf die zu behandelnde(n) Farb­schicht(en) entweicht.3. Apparatus according to claim 2, characterized in that in the IR drying device (12) - seen in the transport direction of the printing press - behind an IR radiation body (15) an ozone generator (21), preferably a rod-shaped high-pressure gas discharge lamp (2) such as A mercury vapor lamp is arranged, which is surrounded by a metal or ceramic sleeve (1), the wall of which has openings (6), from de, forming an annular space (5) Air blown into the annular space (5) escapes in the direction of the paint layer (s) to be treated. 4. Vorrichtung nach Anspruch 3, dadurch gekenn­zeichnet, daß die Öffnung(en) (6) des Ring­raumes (5) in einen Kanal (8) münde(t)(n), der zick-zack-förmig außen an dem in bezug auf die zu behandelnde(n) Farbschicht(en) abge­wandten Bereich der Metall- oder Keramikhülse (1) anliegt und dessen zweckmäßigerweise als Blasdüse ausgebildeter Auslaß (9) auf diese Farbschicht(en) gerichtet ist.4. The device according to claim 3, characterized in that the opening (s) (6) of the annular space (5) into a channel (8) opens (t) (n), the zigzag shape on the outside in relation to the area of the metal or ceramic sleeve (1) facing away from the paint layer (s) to be treated lies and its outlet (9), which is expediently designed as a blowing nozzle, is directed towards this paint layer (s). 5. Vorrichtung nach Anspruch 3 oder 4, dadurch gekennzeichnet, daß die Hochdruckgasentladungs­lampe (2) im Ringraum (5) exzentrisch angeord­net ist.5. Apparatus according to claim 3 or 4, characterized in that the high pressure gas discharge lamp (2) in the annular space (5) is arranged eccentrically. 6. Vorrichtung nach einem der Ansprüche 3 bis 5, dadurch gekennzeichnet, daß auf den Bereich zwischen dem IR-Strahlungskörper (15) und dem Ozonerzeuger (21) eine Absaugeinrichtung ein­wirkt.6. Device according to one of claims 3 to 5, characterized in that a suction device acts on the area between the IR radiation body (15) and the ozone generator (21). 7. Vorrichtung nach einem der Ansprüch 3 bis 6, dadurch gekennzeichnet, daß die Öffnungen (6) in der Hülse (1) als mindestens ein sich über deren (1) gesamte Länge erstreckender Schlitz ausgebildet sind.7. Device according to one of claims 3 to 6, characterized in that the openings (6) in the sleeve (1) are formed as at least one slot extending over their (1) entire length. 8. Vorrichtung nach einem der Ansprüche 3 bis 7, dadurch gekennzeichnet, daß die Hülse (1) und/­oder der Kanal (8) aus einem nicht oxidierba­ren Werkstoff bestehen.8. Device according to one of claims 3 to 7, characterized in that the sleeve (1) and / or the channel (8) consist of a non-oxidizable material. 9. Vorrichtung nach einem der Ansprüche 3 bis 8, dadurch gekennzeichnet, daß die Hülse (1) und/­oder der Kanal (8) aus einem Werkstoff mit katalytischen Eigenschaften zur Erzeugung von Ozon aus vorzugsweise Luftsauerstoff bestehen.9. Device according to one of claims 3 to 8, characterized in that the sleeve (1) and / or the channel (8) consist of a material with catalytic properties for generating ozone from preferably atmospheric oxygen. 10. Vorrichtung nach einem der Ansprüche 3 bis 9, dadurch gekennzeichnet, daß die Hülse (1) und/oder der Kanal (8) aus einem Werkstoff bestehen, der kurzwel­lige, insbesondere UV-Strahlung in Wärmestrahlung umwandelt.10. Device according to one of claims 3 to 9, characterized in that the sleeve (1) and / or the channel (8) consist of a material which converts short-wave, in particular UV radiation into heat radiation.
EP88114925A 1987-09-15 1988-09-13 Method and apparatus for hardening layers applied to an article Expired - Lifetime EP0307848B1 (en)

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DE3800628A DE3800628A1 (en) 1987-09-15 1988-01-12 METHOD AND DEVICE FOR HARDENING LAYERS APPLIED ON A BODY
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Also Published As

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DE3800628C2 (en) 1991-12-12
DE3800628A1 (en) 1989-03-23
US4882853A (en) 1989-11-28
EP0307848B1 (en) 1991-06-12

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