EP0699530B1 - Method and apparatus for drying thermoplastic foils printed in an offset printing machine - Google Patents
Method and apparatus for drying thermoplastic foils printed in an offset printing machine Download PDFInfo
- Publication number
- EP0699530B1 EP0699530B1 EP95113391A EP95113391A EP0699530B1 EP 0699530 B1 EP0699530 B1 EP 0699530B1 EP 95113391 A EP95113391 A EP 95113391A EP 95113391 A EP95113391 A EP 95113391A EP 0699530 B1 EP0699530 B1 EP 0699530B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- flame
- drying
- web
- station
- foil web
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 238000001035 drying Methods 0.000 title claims description 43
- 239000011888 foil Substances 0.000 title claims description 19
- 238000000034 method Methods 0.000 title claims description 13
- 238000007645 offset printing Methods 0.000 title description 5
- 229920001169 thermoplastic Polymers 0.000 title 1
- 239000004416 thermosoftening plastic Substances 0.000 title 1
- 238000007639 printing Methods 0.000 claims description 29
- 238000001816 cooling Methods 0.000 claims description 26
- 238000007602 hot air drying Methods 0.000 claims description 7
- 239000004033 plastic Substances 0.000 claims description 7
- 229920003023 plastic Polymers 0.000 claims description 7
- 238000001459 lithography Methods 0.000 claims 1
- 239000007789 gas Substances 0.000 description 18
- 239000003973 paint Substances 0.000 description 17
- 239000000976 ink Substances 0.000 description 11
- 239000007788 liquid Substances 0.000 description 6
- 238000010422 painting Methods 0.000 description 5
- 239000002985 plastic film Substances 0.000 description 5
- 229920006255 plastic film Polymers 0.000 description 5
- 239000004743 Polypropylene Substances 0.000 description 4
- 239000003086 colorant Substances 0.000 description 4
- -1 polypropylene Polymers 0.000 description 4
- 229920001155 polypropylene Polymers 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 239000004698 Polyethylene Substances 0.000 description 2
- 239000004793 Polystyrene Substances 0.000 description 2
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 2
- 238000007605 air drying Methods 0.000 description 2
- 238000007664 blowing Methods 0.000 description 2
- 238000011109 contamination Methods 0.000 description 2
- 230000009931 harmful effect Effects 0.000 description 2
- 230000002427 irreversible effect Effects 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000004323 axial length Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000004922 lacquer Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002480 mineral oil Substances 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 239000001294 propane Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000007712 rapid solidification Methods 0.000 description 1
- 230000003678 scratch resistant effect Effects 0.000 description 1
- 238000006748 scratching Methods 0.000 description 1
- 230000002393 scratching effect Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000004753 textile Substances 0.000 description 1
- 239000002966 varnish Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Images
Classifications
-
- 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
- B41F23/04—Devices for treating the surfaces of sheets, webs, or other articles in connection with printing by heat drying, by cooling, by applying powders
- B41F23/0403—Drying webs
- B41F23/0436—Drying webs using a combination of radiation, conduction or convection
Definitions
- the present invention relates to a method and an apparatus for Drying a plastic film web printed using the offset process, in particular PP (polypropylene), PS (polystyrene) and PE (polyethylene) film.
- the invention relates in particular to a method and an apparatus for drying of plastic films printed in the web offset printing process, their printing ink is still liquid behind the last printing station and can be put down or "Clap" tends.
- DE-AS 1 201 255 already discloses a dryer for thin sheet-like material, for example known paper that can also be used for paper-like substances, for example textiles, knitwear, films, foils. The special with which Printing problems associated with plastic films are in this document not addressed. Furthermore, from DE-Z "The Polygraph" 24/1967, Pages 1646 to 1656 a gas flame dryer known for the Drying of webs printed in web offset printing is used.
- the object of the present invention is therefore to provide a method and a device for drying plastic film webs printed using the offset process, ensure the improved drying of the printed film webs and effectively avoid smearing the ink.
- this object is achieved by a method according to Claim 1.
- the flame drying leads to short-term high heating the film surface and thus for shock evaporation in the paint application contained solvents.
- the higher the temperature of the gas flame the more drying is better and more effective.
- the film web is printed on your Flame-dried surface. This creates the advantage that initially only the actual ink on the film web is flame dried while the plastic film itself itself only indirectly through the High temperature is affected.
- the temperature of the flame drying has where there is an irreversible deformation of the film web.
- the film web is simultaneously with or after in the web feed direction the flame drying cooled.
- Such cooling of the film web is prevented their deformation due to the heat of the gas flame creates the danger a condensation on the film web to be painted later and above all leads to rapid solidification or cooling of the printing inks.
- the cooled film web is subjected to painting.
- the Painting prevents the risk of surface contamination or harmful Effects on the film web.
- the actual printing sections of the Film webs are covered so that they are resistant to abrasion and contamination.
- the painted The film web is subjected to hot air drying and then cooled. The hot air drying leads to a quick drying of the surface sheet, the subsequent cooling both the paint drying and a brings about additional color drying.
- the film web be passed through a printing station is pre-dried by blowing air. This can already be between pre-drying which prepares the subsequent flame drying for individual printing stations of the film web colors can be achieved. After is particularly preferred Blown air drying is provided for each printing station.
- the inventive device for performing the method is the subject of claim 3.
- the flame drying station has one on the printed side of the film web arranged gas nozzle, which is preferably substantially over the entire Width of the film web extends.
- gas nozzle is in the immediate vicinity or behind the flame station arranged. The cooling station cools down the temperature of the Foil sheet and thus to harden the liquid colors when heated.
- the cooling station has a cooling roller on the unprinted side of the Foil sheet is preferably arranged immediately below the gas nozzle.
- a cooling roller on the unprinted side of the Foil sheet is preferably arranged immediately below the gas nozzle.
- Behind the cooling station is a painting station, a hot air drying station and a final cooling station. These stations serve for coating on the print side of the film web and subsequent hot air drying or cooling of the paint application, which is thus scratch-resistant.
- a guide roller to guide the film webs, has the segment wheels, which for contacting unprinted sections the film web, on which there is no paint application. To this Depending on the drying process, a touch of color-bearing can Layers of the web with the guide roller can be avoided.
- a conventional web offset machine is shown, for example pulled a polypropylene (PP) film 2 from a winding roll 4 and is successively passed through printing stations 6, 8, 10, etc., where the film web 2 with different colors, for example cyan, magenta, yellow and Is printed in black.
- a blowing air drying device 26 or 24 arranged a current of air at room temperature against the pressure side of the film web leads to pre-dry the film web.
- Flame drying station consisting of a gas nozzle 12 and an associated one Gas bottle 14 is made.
- the flame drying station is used for flame drying the pressure side of the film web 2 and uses, for example, propane gas, Natural gas or town gas, which is a gas flame with a temperature of approx. 500 ° C delivers.
- the depth or axial length of the gas nozzle opening is maximum about 1 cm.
- the gas nozzle is at such a distance above that Film web arranged that the highest temperature considered optimal Height of the color application of the film web is applied.
- a cooling station having a cooling roller 16 the in contact with the underside of the film web cools it at about 10 ° C. Thereby drying of the still liquid printing inks is achieved.
- Cooling station 16 Behind the cooling station 16 is a painting station 18 in which the entire Film web 2 is coated with a protective lacquer covering the surface to protect against pollution, destruction and scratching.
- the Cooling roller 16 is therefore, in particular, for the downstream coating station 18 important because the paint is not brought through the cooling roller Cooling due to its heat would dry on the paint coat.
- a temperature after the paint drying of 40 ° to 50 ° C is observed, while the temperature after cooling is about 30 ° was up to 35 ° C.
- IR drying devices can be provided to accelerate paint drying. The high temperature flame drying in connection with the feed speed of the film web is so adjust that a permanent deformation of the film web is avoided.
- FIG Figures 2 and 3 Various embodiments of the flame drying station 12 are shown in FIG Figures 2 and 3 shown.
- Fig. 2 is a variation over the entire width of the film web 2nd extending gas nozzle these in three extending over a short width Segments 12 ', 12' ', 12' '' disassembled over a certain length in succession and are staggered across the width, for example diagonally as shown in Fig. 2.
- the individual gas nozzle segments 12 ', 12' 'and 12 '' ' have a width that is dimensioned so that the on the film web 2nd formed color printing area 2 'are appropriately detected and covered. Between the blank areas 2 'existing blank areas do not need one Gas nozzle segment to be detected.
- 3 is an alternative embodiment of the flame drying station shown at the three bar-like gas nozzles 12a, 12a ', which extend over the entire Extend the width of the film web 2, arranged one behind the other at the same distance are. This results in a particularly effective sequential heating of the Color printing areas reached. This is for the special application of over a greater length of color-dryable film webs.
- the drying device according to the invention leads to drying the after Print order liquid colors and especially to dry the liquid Paint applications before the paint cover. There is also the risk of collection reduced by condensed water, which dissolves the water-soluble paint Way would attack.
Landscapes
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)
Description
Die vorliegende Erfindung betrifft ein Verfahren und eine Vorrichtung zum Trocknen einer im Offsetverfahren bedruckten Kunststoff-Folienbahn, insbesondere PP (Polypropylen)-, PS (Polystyrol)- und PE (Polyethylen)-Folie. Die Erfindung betrifft insbesondere ein Verfahren und eine Vorrichtung zum Trocknen von im Rollenoffset-Druckverfahren bedruckten Kunststoff-Folien, deren Druckfarbe hinter der letzten Druckstation noch flüssig ist und zum Ablegen bzw. "Abklatschen" neigt.The present invention relates to a method and an apparatus for Drying a plastic film web printed using the offset process, in particular PP (polypropylene), PS (polystyrene) and PE (polyethylene) film. The invention relates in particular to a method and an apparatus for drying of plastic films printed in the web offset printing process, their printing ink is still liquid behind the last printing station and can be put down or "Clap" tends.
Die Weiterverarbeitung derartiger bedruckter Folienbahnen setzt voraus, daß die Druckfarben trocken sind, so daß die Folienbahnen ohne Ablage aufgewickelt und weiterverarbeitet werden können. Herkömmliche Verfahren und Vorrichtungen sind nicht geeignet, die Druckfarben unmittelbar hinter der letzten Druckstation so zu trocknen, daß die Folienbahn ohne Verwischen oder Ablage aufgewickelt werden kann. Bei früher gebräuchlichen Bogenoffset-Druckmaschinen bestand dieses Problem nicht, da die einzelnen Bögen entsprechend übereinandergeschichtet wurden, so daß eine zur Trocknung dienende Luftschicht über einen längeren Zeitraum zwischen den Bögen wirken und die Druckfarbe trocknen konnte. Bei der Herstellung großer Mengen von Kunststoffdeckeln, Kunststoffdosen und anderen Kunststoff-Gegenständen hat sich in jüngster Zeit die Bedruckung von Folien auf Rollenoffsetmaschinen angeboten, da dieses Verfahren eine kontinuierliche Herstellung großer Folienbahnmengen erlaubt, was bisher im Offsetdruckbereich nicht möglich war.The further processing of such printed film webs presupposes that the Printing inks are dry so that the film webs are wound up without being deposited and can be processed further. Conventional methods and devices are not suitable, the printing inks immediately behind the last printing station to dry so that the film web is wound without smudging or storage can be. For previously used sheetfed offset presses this problem did not exist because the individual sheets were layered accordingly were so that a layer of air for drying over work between the sheets for a longer period of time and dry the ink could. In the production of large quantities of plastic lids, plastic cans and other plastic items has recently become the Printing of foils on web offset presses is offered because of this process continuous production of large amounts of film allows what was previously not possible in the offset printing area.
Das Problem verschärft sich, wenn die Folienbahnen mit Lack abgedeckt werden bzw. lackiert werden, weil bei der Lacktrocknung die noch feuchten F-wieder angelöst werden, so daß es zu einer Verschmierung kommen kann. The problem is exacerbated if the film webs are covered with varnish or painted because the still wet F-again when drying the paint be loosened so that smearing can occur.
Ferner besteht die Gefahr, daß die noch warmen Druckfarben nach der Lackbeschichtung Kondenswasser anziehen, das den wasserlöslichen Lack anlöst und verschmiert.There is also a risk that the printing inks, which are still warm, after coating the paint Put on condensed water that will dissolve the water-soluble paint and smeared.
Aus der DE-AS 1 201 255 ist bereits ein Trockner für dünnes bahnförmiges Gut, zum Beispiel Papier bekannt, der auch verwendbar ist für papierähnliche Stoffe, zum Beispiel Textilien, Strickwaren, Filme, Folien. Die besonderen, mit der Bedruckung von Kunststoff-Folien verbundenen Probleme sind in dieser Druckschrift nicht angesprochen. Ferner ist aus der DE-Z "Der Polygraph" 24/1967, Seiten 1646 bis 1656 bereits ein Gasflammentrockner bekannt, der für die Trocknung von im Rollenoffsetdruck bedruckten Papierbahnen eingesetzt wird.DE-AS 1 201 255 already discloses a dryer for thin sheet-like material, for example known paper that can also be used for paper-like substances, for example textiles, knitwear, films, foils. The special with which Printing problems associated with plastic films are in this document not addressed. Furthermore, from DE-Z "The Polygraph" 24/1967, Pages 1646 to 1656 a gas flame dryer known for the Drying of webs printed in web offset printing is used.
Aufgabe der vorliegenden Erfindung ist daher die Angabe eines Verfahrens und einer Vorrichtung zum Trocknen von im Offsetverfahren bedruckten Kunststoff-Folienbahnen, die verbesserte Trocknung der bedruckten Folienbahnen gewährleisten und das Abschmieren der Druckfarbe wirksam vermeiden.The object of the present invention is therefore to provide a method and a device for drying plastic film webs printed using the offset process, ensure the improved drying of the printed film webs and effectively avoid smearing the ink.
Diese Aufgabe wird erfindungsgemäß gelöst durch ein Verfahren gemäß Anspruch 1. Die Flammtrocknung führt zu einer kurzfristigen Hocherhitzung der Folienoberfläche und damit zur Schockverdampfung der in dem Farbauftrag enthaltenen Lösungsmittel. Je höher die Temperatur der Gasflamme ist, desto besser und wirksamer geschieht die Trocknung. Die Folienbahn wird auf ihrer bedruckten Oberfläche flammgetrocknet. Dies schafft den Vorteil, daß zunächst nur die eigentliche Druckfarbe auf der Folienbahn flammgetrocknet wird, während die aus Kunststoff bestehende Folienbahn selbst nur mittelbar durch die Hochtemperatur beeinträchtigt wird. Die Temperatur der Flammtrocknung hat dort eine Grenze, wo eine irreversible Verformung der Folienbahn eintritt.According to the invention, this object is achieved by a method according to Claim 1. The flame drying leads to short-term high heating the film surface and thus for shock evaporation in the paint application contained solvents. The higher the temperature of the gas flame, the more drying is better and more effective. The film web is printed on your Flame-dried surface. This creates the advantage that initially only the actual ink on the film web is flame dried while the plastic film itself itself only indirectly through the High temperature is affected. The temperature of the flame drying has where there is an irreversible deformation of the film web.
Ferner wird die Folienbahn in Bahnvorschubrichtung gleichzeitig mit oder nach der Flammtrocknung gekühlt. Eine derartige Kühlung der Folienbahn verhindert ihre Verformung infolge der Wärmeeinwirkung der Gasflamme, setzt die Gefahr eines Kondenswasseransatzes auf der später zu lackierenden Folienbahn herab und führt vor allem zu einer schnellen Erstarrung bzw. Erkaltung der Druckfarben. Die gekühlte Folienbahn wird einer Lackierung unterzogen wird. Die Lackierung verhindert die Gefahr von Oberflächen-Verunreinigungen bzw. schädlichen Einwirkungen auf die Folienbahn. Die eigentlichen Druckabschnitte der Folienbahn werden abriebfest und verschmutzungssicher abgedeckt. Die lackierte Folienbahn wird einer Heißlufttrocknung unterzogen und anschließend gekühlt. Die Heißlufttrockung führt zu einer Schnelltrocknung des Oberflächenlakkes, wobei die anschließende Kühlung sowohl die Lacktrocknung als auch eine zusätzliche Farbtrocknung herbeiführt.Furthermore, the film web is simultaneously with or after in the web feed direction the flame drying cooled. Such cooling of the film web is prevented their deformation due to the heat of the gas flame creates the danger a condensation on the film web to be painted later and above all leads to rapid solidification or cooling of the printing inks. The cooled film web is subjected to painting. The Painting prevents the risk of surface contamination or harmful Effects on the film web. The actual printing sections of the Film webs are covered so that they are resistant to abrasion and contamination. The painted The film web is subjected to hot air drying and then cooled. The hot air drying leads to a quick drying of the surface sheet, the subsequent cooling both the paint drying and a brings about additional color drying.
Es ist bevorzugt, daß die Folienbahn nach dem Durchgang durch eine Druckstation durch Blasluft vorgetrocknet wird. Dadurch kann bereits zwischen den einzelnen Druckstationen eine die spätere Flammtrocknung vorbereitende Vortrocknung der Folienbahnfarben erreicht werden. Besonders bevorzugt ist nach jeder Druckstation eine Blaslufttrocknung vorgesehen.It is preferred that the film web be passed through a printing station is pre-dried by blowing air. This can already be between pre-drying which prepares the subsequent flame drying for individual printing stations of the film web colors can be achieved. After is particularly preferred Blown air drying is provided for each printing station.
Die erfindungsgemäße Vorrichtung zur Durchführung des Verfahrens ist Gegenstand von Anspruch 3.The inventive device for performing the method is the subject of claim 3.
Die Flammtrocknungsstation weist eine auf der bedruckten Seite der Folienbahn angeordnete Gasdüse auf, die sich bevorzugt im wesentlichen über die gesamte Breite der Folienbahn erstreckt. Hierdurch werden in geeigneter Weise nur die Druckfarben der Flammtrocknung unterzogen, während die darunterliegenden Bereiche der Folienbahn nur mittelbar unter Wärmeeinfluß geraten, während die unbedruckte Seite der Folienbahn überhaupt keiner unmittelbaren Hitzeeinwirkung ausgesetzt ist. Dies vermindert die Gefahr einer irreversiblen Verformung der Folienbahn. Eine Kühlstation ist in unmittelbarer Nähe oder hinter der Flammstation angeordnet. Die Kühlstation führt zu einer Abkühlung der Temperatur der Folienbahn und damit zu einer Härtung der im erhitzten Zustand flüssigen Farben.The flame drying station has one on the printed side of the film web arranged gas nozzle, which is preferably substantially over the entire Width of the film web extends. As a result, only the Inks undergo flame drying while the ones below Areas of the film web come only indirectly under the influence of heat, while the unprinted side of the film web no direct heat at all is exposed. This reduces the risk of irreversible deformation the film web. A cooling station is in the immediate vicinity or behind the flame station arranged. The cooling station cools down the temperature of the Foil sheet and thus to harden the liquid colors when heated.
Die Kühlstation weist eine Kühlwalze auf, die auf der unbedruckten Seite der Folienbahn bevorzugt unmittelbar unterhalb der Gasdüse angeordnet ist. Hierdurch wird bereits bei der Flammtrocknung eine schädliche Erwärmung der Folienbahn vermieden und eine Kühlung der Folienbahn herbeigeführt, die anschließend eine Abkühlung der heißen Druckoberfläche der Folienbahn begünstigt. Hinter der Kühlstation ist eine Lackierstation, eine Heißlufttrocknungsstation und eine abschließende Kühlstation angeordnet. Diese Stationen dienen zum Lackauftrag auf die Druckseite der Folienbahn und anschließenden Heißlufttrocknung bzw. Kühlung des Lackauftrages, der somit kratzfest wird.The cooling station has a cooling roller on the unprinted side of the Foil sheet is preferably arranged immediately below the gas nozzle. Hereby is already harmful heating of the flame drying Avoided film web and brought about cooling of the film web, which then cooling of the hot printing surface of the film web favors. Behind the cooling station is a painting station, a hot air drying station and a final cooling station. These stations serve for coating on the print side of the film web and subsequent hot air drying or cooling of the paint application, which is thus scratch-resistant.
Ferner ist bevorzugt, zur Führung der Folienbahnen eine Führungsrolle einzusetzen, die Segmenträder aufweist, welche zur Anlage an unbedruckten Abschnitten der Folienbahn gelangen, auf denen kein Farbauftrag besteht. Auf diese Weise kann unabhängig von der Trocknung eine Berührung von farbtragenden Schichten der Bahn mit der Führungsrolle vermieden werden.It is further preferred to use a guide roller to guide the film webs, has the segment wheels, which for contacting unprinted sections the film web, on which there is no paint application. To this Depending on the drying process, a touch of color-bearing can Layers of the web with the guide roller can be avoided.
Weitere Vorteile, Merkmale und Anwendungsmöglichkeiten der vorliegenden
Erfindung ergeben sich aus der folgenden Beschreibung bevorzugter Ausführungsbeispiele
in Verbindung mit der Zeichnung.
In Fig. 1 ist eine herkömmliche Rollenoffsetmaschine gezeigt, bei der beispielsweise
eine Polypropylen (PP)-Folie 2 von einer Wickelrolle 4 abgezogen und
nacheinander durch Druckstationen 6, 8, 10 etc. geführt wird, wo die Folienbahn
2 mit unterschiedlichen Farben, beispielsweise Cyan, Magenta, Gelb und
Schwarz bedruckt wird. Zwischen den Druckstationen 6, 8 und 8, 10 ist jeweils
eine Blasluft-Trocknungseinrichtung 26 bzw. 24 angeordnet, die einen Strom
von auf Zimmertemperatur befindlicher Luft gegen die Druckseite der Folienbahn
führt, um die Folienbahn vorzutrocknen.In Fig. 1, a conventional web offset machine is shown, for example
pulled a polypropylene (PP)
In Bahnführungsrichtung hinter der letzten Druckstation 10 befindet sich eine
Flammtrocknungsstation, die aus einer Gasdüse 12 und einer damit verbundenen
Gasflasche 14 besteht. Die Flammtrocknungsstation dient zur Flammtrocknung
der Druckseite der Folienbahn 2 und verwendet beispielsweise Propangas,
Erdgas oder Stadtgas, welches eine Gasflamme mit einer Temperatur von ca.
500° C liefert. Die Tiefe bzw. axiale Länge der Gasdüsen-Öffnung beträgt
maximal etwa 1 cm. Die Gasdüse ist in einem derartigen Abstand über der
Folienbahn angeordnet, daß die als optimal betrachtete größte Temperatur auf
Höhe des Farbauftrages der Folienbahn aufgebracht wird.There is one in the web guide direction behind the
Unmittelbar unter der Flammtrocknungsstation befindet sich auf der Unterseite
der Folienbahn angeordnet eine Kühlstation, die eine Kühlwalze 16 aufweist, die
in Kontakt mit der Unterseite der Folienbahn diese mit etwa 10° C kühlt. Dadurch
wird eine Trocknung der noch flüssigen Druckfarben erreicht.Immediately below the flame drying station is on the bottom
the film web arranged a cooling station having a
Hinter der Kühlstation 16 befindet sich eine Lackierstation 18, in der die gesamte
Folienbahn 2 mit einem Schutzlack beschichtet wird, der die Oberfläche
gegen Verschmutzung, Zerstörung und Kratzeinwirkung schützen soll. Die
Kühlwalze 16 ist insbesondere deshalb für die nachgeordnete Lackierstation 18
von Bedeutung, da der Lack ohne eine durch die Kühlwalze herbeigeführte
Abkühlung aufgrund seiner Hitze schon auf dem Lackmantel trocknen würde. Behind the
Schließlich befindet sich hinter der Lackierstation 18 eine Heißluft-Trocknungsstation
20, bei der die lackierte Folienbahn 2 mit Heißluft getrocknet wird. Die
anschließende zweite Kühlstation 21 dient zur Abkühlung der aufgeheizten
Folienbahn 2. Schließlich wird die entsprechend bearbeitete Folienbahn 2 auf
einer Trommel 22 aufgewickelt. Die zweite Kühlstation 21 bewirkt sowohl eine
Lacktrocknung als auch eine zusätzliche Farbtrocknung der unter dem Lack
befindlichen Farbe.Finally, there is a hot air drying station behind the
Im vorliegenden Beispiel wurde eine Temperatur nach der Lacktrocknung von 40° bis 50° C beobachtet, während die Temperatur nach der Kühlung etwa 30° bis 35° C betrug. Zusätzlich können IR-Trocknungseinrichtungen vorgesehen werden, um die Lacktrocknung zu beschleunigen. Die Hochtemperatur-Flammtrocknung in Verbindung mit der Vorschubgeschwindigkeit der Folienbahn ist so einzustellen, daß eine bleibende Verformung der Folienbahn vermieden wird.In the present example, a temperature after the paint drying of 40 ° to 50 ° C is observed, while the temperature after cooling is about 30 ° was up to 35 ° C. In addition, IR drying devices can be provided to accelerate paint drying. The high temperature flame drying in connection with the feed speed of the film web is so adjust that a permanent deformation of the film web is avoided.
Verschiedene Ausführungsformen der Flammtrocknungsstation 12 sind in
Figuren 2 und 3 gezeigt.Various embodiments of the
In Fig. 2 ist in Abwandlung einer sich über die gesamte Breite der Folienbahn 2 erstreckenden Gasdüse diese in drei sich über eine kurze Breite erstreckende Segmente 12', 12'', 12''' zerlegt, die über eine gewisse Länge hintereinander und gegeneinander über die Breite versetzt angeordnet sind, beispielsweise diagonal wie in Fig. 2 gezeigt. Die einzelnen Gasdüsensegmente 12', 12'' und 12''' haben dabei eine Breite, die so bemessen ist, daß die auf der Folienbahn 2 gebildeten Farbdruckbereich 2' geeignet erfaßt und abgedeckt sind. Zwischen den Farbdruckbereichen 2' bestehende Leerbereiche brauchen nicht von einem Gasdüsensegment erfaßt zu sein.In Fig. 2 is a variation over the entire width of the film web 2nd extending gas nozzle these in three extending over a short width Segments 12 ', 12' ', 12' '' disassembled over a certain length in succession and are staggered across the width, for example diagonally as shown in Fig. 2. The individual gas nozzle segments 12 ', 12' 'and 12 '' 'have a width that is dimensioned so that the on the film web 2nd formed color printing area 2 'are appropriately detected and covered. Between the blank areas 2 'existing blank areas do not need one Gas nozzle segment to be detected.
In Fig. 3 ist eine alternative Ausführungsform der Flammtrocknungsstation
gezeigt, bei der drei balkenartige Gasdüsen 12a, 12a', die sich über die gesamte
Breite der Folienbahn 2 erstrecken, hintereinander in gleichem Abstand angeordnet
sind. Dadurch wird eine besonders wirkungsvolle sequentielle Erhitzung der
Farbdruckbereiche erreicht. Dies dient für den besonderen Anwendungsfall von
über eine größere Länge farbzutrockenden Folienbahnen.3 is an alternative embodiment of the flame drying station
shown at the three bar-
Allgemein hat sich herausgestellt, daß die in den Druckfarben enthaltenen
Lösungsmittel, insbesondere Mineralöle und derartige Flüssigkeiten bei der
Stoßgasbeflammung am besten ausgetrieben werden. Eine einzelne sich über die
Gesamtbreite erstreckende balkenförmige Gasdüse 12 ist daher im Regelfall
ausreichend. Dabei ist jedoch eine Bündelung der Gasflamme auf die axiale
Breite der Folienbahn 2 zu gewährleisten, so daß eine möglichst große Temperatur
im Folienbahnbereich erzielt wird.In general, it has been found that those contained in the printing inks
Solvents, especially mineral oils and such liquids in the
Impact gas flames are best expelled. A single yourself about that
The overall width of the bar-shaped
Die erfindungsgemäße Trocknungsvorrichtung führt zur Trocknung der nach dem Druckauftrag flüssigen Farben und insbesondere zu einer Trocknung der flüssigen Farbaufträge vor der Lackabdeckung. Ferner ist die Gefahr der Sammlung von Kondenswasser vermindert, welches den wasserlöslichen Lack in auflösender Weise angreifen würde.The drying device according to the invention leads to drying the after Print order liquid colors and especially to dry the liquid Paint applications before the paint cover. There is also the risk of collection reduced by condensed water, which dissolves the water-soluble paint Way would attack.
Claims (5)
- A method of drying a plastic foil web printed by offset lithography, more particularly PP, PS or PE foil (2), which is passed through a plurality of printing units (6, 8 and 10), the foil web (2) being flame dried downstream from the last printing unit in the direction of feed, being cooled after flame drying, after this being lacquered and finally being subjected to hot air drying followed by final cooling, the temperature of the flame and the velocity of the web being so selected during flame drying that permanent deformation of the web is avoided, it only being the printing ink as such that is flame dried on the foil web (2), whereas the plastic foil web itself is only affected indirectly by the high temperature.
- The method as claimed in claim 1, characterized in that the foil web (2) is pre-dried after the passage through one printing unit (6, 8 and 10) by blown air.
- An apparatus for the performance of the method as claimed in claim 1 or claim 2 comprising a plurality of printing units (6, 8 and 10) for printing plastic foil webs, more particularly PP, PS or PE foils (2), including a flame drying station (12 and 14) arranged following the last printing unit (10), said station having a gas nozzle (12) arranged on the printed side of the foil web (2), a cooling roll (16), which is located directly in the vicinity of, or downstream from, the flame drying station (12 and 14), a lacquering station (18) arranged downstream from the cooling roll (16), a following hot air drying station (20) and a final cooling station (29), the temperature of the flame emerging from the gas nozzle and the feed velocity of the web being so selected that permanent deformation of the foil web (2) is avoided, only the printing ink as such on the foil web (2) being flame dried, whereas the plastic foil web itself is only affected indirectly by the high temperature.
- The apparatus as claimed in claim 3, characterized in that the cooling roll (16) is arranged directly underneath the gas nozzle (12) to the unprinted side of the foil web.
- The apparatus as claimed in claim 3, characterized in that the gas nozzle (12) extends essentially over the full width of the foil web (2).
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4430527 | 1994-08-27 | ||
| DE4430527A DE4430527C2 (en) | 1994-08-27 | 1994-08-27 | Method and device for drying film webs printed using the offset method |
| US08/823,448 US5730058A (en) | 1994-08-27 | 1997-03-24 | Method and apparatus for the drying of film lines printed in the offset method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0699530A1 EP0699530A1 (en) | 1996-03-06 |
| EP0699530B1 true EP0699530B1 (en) | 1999-11-03 |
Family
ID=25939595
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP95113391A Expired - Lifetime EP0699530B1 (en) | 1994-08-27 | 1995-08-25 | Method and apparatus for drying thermoplastic foils printed in an offset printing machine |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US5730058A (en) |
| EP (1) | EP0699530B1 (en) |
| DE (1) | DE4430527C2 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19735984A1 (en) * | 1997-08-19 | 1999-02-25 | Cleanpack Gmbh Innovative Verp | Method and device for drying plastic film webs printed with metal-containing and non-metal-containing inks |
| AU2003900180A0 (en) * | 2003-01-16 | 2003-01-30 | Silverbrook Research Pty Ltd | Method and apparatus (dam001) |
| US8118420B2 (en) | 2007-12-21 | 2012-02-21 | Palo Alto Research Center Incorporated | Contactless ink leveling method and apparatus |
| DE102008010200A1 (en) * | 2008-02-20 | 2009-09-03 | Manroland Ag | Web-fed printing machine has a printing couple/group for printing a length of printed material with a length and width direction on a first and second printing surface with a printing ink |
| DK2159056T3 (en) * | 2008-08-27 | 2014-04-14 | Rpc Bebo Print Patent Gmbh | DEVICE AND PROCEDURE FOR PRINTING AND DRYING PLASTIC FILMS |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1201255B (en) * | 1959-01-27 | 1965-09-16 | Ernest Arthur Timson | Dryer for thin web-shaped goods, e.g. B. paper |
| US4766840A (en) * | 1987-01-14 | 1988-08-30 | World Color Press, Inc. | Paper coating machine |
Family Cites Families (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE895458C (en) * | 1935-12-26 | 1953-11-02 | Interchem Corp | Drying inks |
| US2268985A (en) * | 1937-12-29 | 1942-01-06 | Interchem Corp | Method and apparatus for drying printing ink |
| US2536609A (en) * | 1945-12-08 | 1951-01-02 | C M Kemp Mfg Company | Ink drying burner |
| DE1041000B (en) * | 1955-06-02 | 1958-10-16 | Dr Walter Koecher | Method and device for drying and gelling film-forming compositions |
| DE1811836U (en) * | 1957-04-24 | 1960-05-25 | Autogen Endress A G Appbau | DEVICE FOR DRYING THE PRINTED INK AND UNLOADING THE PAPER IN ROTARY PRINTING MACHINES. |
| DE1219044B (en) * | 1963-11-11 | 1966-06-16 | Albert Schnellpressen | Device for drying printed paper webs or the like. |
| FI46281C (en) * | 1964-05-21 | 1973-02-12 | Skandinaviska Apparatind | Process for the production of cooling rollers and the like for strip-shaped material and rollers produced by the process. |
| DE1499073B1 (en) * | 1966-09-05 | 1971-12-09 | Vits Maschb Gmbh | Method and device for stabilizing the position of a web of material when it is floating through a treatment space that is at least partially delimited by a wing profile |
| US3453742A (en) * | 1967-09-26 | 1969-07-08 | Nat Distillers Chem Corp | Apparatus for drying printing ink on plastic film |
| GB1216267A (en) * | 1968-02-09 | 1970-12-16 | Wilkins & Mitchell Ltd | Improvements in or relating to presses |
| JPS5615012Y2 (en) * | 1971-08-06 | 1981-04-08 | ||
| US3962213A (en) * | 1974-01-23 | 1976-06-08 | Flynn John H | Method of drying coated webs |
| FR2344797A1 (en) * | 1976-03-16 | 1977-10-14 | Flynn John | Flame drying web coating contg. volatile prods. - using stable air sheets enabling max. use to be made of burner flame |
| DE3114406A1 (en) * | 1981-04-09 | 1982-11-04 | Lehmacher, Hans, 5216 Niederkassel | Printing machine for printing on a web of plastic film |
| DE3229903A1 (en) * | 1982-08-11 | 1984-02-16 | Mohndruck Graphische Betriebe GmbH, 4830 Gütersloh | Process and device for reprocessing a drying medium used for drying solvent-containing inks, paints, adhesives or the like on paper or comparable cellulose products |
| US5141988A (en) * | 1989-01-10 | 1992-08-25 | Reichhold Chemicals, Inc. | Blister resistant paper coating latex |
| US5416984A (en) * | 1993-11-18 | 1995-05-23 | Heidelberg Druckmaschinen Ag | Apparatus and method for deflecting a web |
-
1994
- 1994-08-27 DE DE4430527A patent/DE4430527C2/en not_active Expired - Lifetime
-
1995
- 1995-08-25 EP EP95113391A patent/EP0699530B1/en not_active Expired - Lifetime
-
1997
- 1997-03-24 US US08/823,448 patent/US5730058A/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1201255B (en) * | 1959-01-27 | 1965-09-16 | Ernest Arthur Timson | Dryer for thin web-shaped goods, e.g. B. paper |
| US4766840A (en) * | 1987-01-14 | 1988-08-30 | World Color Press, Inc. | Paper coating machine |
Also Published As
| Publication number | Publication date |
|---|---|
| US5730058A (en) | 1998-03-24 |
| EP0699530A1 (en) | 1996-03-06 |
| DE4430527C2 (en) | 1996-07-11 |
| DE4430527A1 (en) | 1996-03-28 |
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