EP0839651B1 - Powdering method, specially for printed sheet materials in a printing machine - Google Patents

Powdering method, specially for printed sheet materials in a printing machine Download PDF

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Publication number
EP0839651B1
EP0839651B1 EP97117530A EP97117530A EP0839651B1 EP 0839651 B1 EP0839651 B1 EP 0839651B1 EP 97117530 A EP97117530 A EP 97117530A EP 97117530 A EP97117530 A EP 97117530A EP 0839651 B1 EP0839651 B1 EP 0839651B1
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EP
European Patent Office
Prior art keywords
printed material
dusting
volumetric flow
nozzles
fed
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
Application number
EP97117530A
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German (de)
French (fr)
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EP0839651A1 (en
Inventor
Achim Stöffler
Holger Dr.-Ing. Wiese
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.)
Manroland AG
Original Assignee
MAN Roland Druckmaschinen 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
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Publication of EP0839651A1 publication Critical patent/EP0839651A1/en
Application granted granted Critical
Publication of EP0839651B1 publication Critical patent/EP0839651B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B41F23/06—Powdering devices, e.g. for preventing set-off

Definitions

  • the invention relates to a method for dusting a printing material in a Printing machine, with at least one row of the substrate width extending pollination nozzles according to the preamble of the main claim.
  • the process is particularly suitable for sheet-shaped substrates.
  • a pollination device for powder pollination of freshly printed sheets is known from DE 22 07 983 B2.
  • the facility is said to be the dusting of Prevent powder beyond the limits of the effective range and powder recovery enable.
  • Above the sheet conveying level is a powder feed tube arranged from the powder dusted on the sheet by means of compressed air becomes.
  • Blow curtain In the sheet conveying direction before and after the powder feed tube is as Blow curtain each arranged a blow pipe with an associated suction pipe through which excess powder can be sucked off.
  • the outlet openings of the outlet nozzles are at right angles to the sheet conveying plane, i.e. arranged vertically.
  • the device has a blower, preferably one Axial fan, which is directed perpendicular to the sheet conveying plane Airflow generated and that the powder nozzles arranged in this airflow are.
  • a disadvantage of these designs is that the uncontrolled leakage of Pollination material in the printing press, especially in the sheet delivery, is not sufficiently prevented. This leads to machine contamination are exacerbated by excessive dosing of pollination material.
  • the use of blow and suction pipes as an air curtain creates additional Turbulence and swirling powder, the turbulence in connection with passing Gripper systems reinforced during the pollination process can be.
  • the quality that can be achieved in the pollination process unsatisfactory.
  • the substrates fixed in the gripper closure are often in the Area of the leading edge insufficiently dusted, causing the arch to be deposited Leads on the leading edge in the delivery stack.
  • a device for applying powder particles is on known a printed sheet in the delivery of a printing press.
  • a spray device By means of a a spray device generating gas flow, powder particles are placed on the Bow transported.
  • the spray device is outside and below that of arranged in an endlessly encircling chain conveyor system, so that the powder flow is only directed towards the underside of the sheet.
  • the spray device is an electrode for electrical Charging the arc associated with certain polarity.
  • the powder stream is directed towards the outlet channel by a prevailing negative pressure.
  • the object of the invention is to provide a pollination process that the above Avoids disadvantages, especially a more uniform pollination of the Substrates guaranteed and the consumption of pollination material noticeable reduced.
  • a stationary device is installed inside a pollination device Flow, built up as a pollination material and separated at outlet nozzles Compressed air, or as a mixture of pollination material and compressed air, in one flow direction.
  • the known structure of a Blow curtain can be avoided by the volume flow completely or partially already sucked off at the nozzles and in a circulation system of the pollination device is fed back for reuse.
  • the not vacuumed Volume flow that hits the substrate in the direction of flow becomes dependent on the substrate width format and / or the substrate length format or the print image (subject) controlled according to the substrate transported.
  • a pollination device is arranged in the delivery, which has at least one row of nozzles extending over the maximum format width of the printing material.
  • the nozzles are used for the separate discharge of compressed air or pollination material or for the discharge of a mixture of pollination material and compressed air.
  • the pollinating material emerging at the nozzles is first sucked off completely over the entire width of the format, for example by a suction device.
  • the exiting volume flow is sucked off depending on the format width, for example by a suction device, and returned to a circuit.
  • the volume flow not sucked out continues to emerge from the nozzles and strikes the printing material at an acute angle to the conveying plane and in the conveying direction of the printing material.
  • the dusting of the dusting material at the nozzles is additionally dependent on the format length of the printing material and / or on the format width of the printing material and / or depending on the print image.
  • the control of the format width, format length or print image dependent suction is preferably carried out from a control center.
  • a partial volume flow can already be branched off within the dusting device by means of an internal suction in front of the nozzles. The partial volume flow is then fed directly to the pollination device in a circuit.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Breeding Of Plants And Reproduction By Means Of Culturing (AREA)
  • Paper (AREA)
  • Printing Methods (AREA)
  • Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)

Abstract

The method uses a dust-applicator which comprises at least one row of nozzles extending over the maximum format width of the printing material. The current consisting of compressed air and dusting material emerging from the nozzles through the dust-applicator is constantly produced. The flow volume is entirely or partially sucked up directly by the nozzles and returned into the dust-applicator circuit. The flow volume not sucked up is conveyed to the plane of motion and the direction of the motion of the printed material on a slope towards the printed material.

Description

Die Erfindung betrifft ein Verfahren zum Bestäuben eines Bedruckstoffes in einer Druckmaschine, mit wenigstens einer Reihe von sich über die Bedruckstoffbreite erstreckenden Bestäubungsdüsen nach dem Oberbegriff des Hauptanspruches. Das Verfahren eignet sich insbesondere für bogenförmige Bedruckstoffe.The invention relates to a method for dusting a printing material in a Printing machine, with at least one row of the substrate width extending pollination nozzles according to the preamble of the main claim. The process is particularly suitable for sheet-shaped substrates.

Eine Bestäubungseinrichtung zur Puderbestäubung von frisch bedruckten Bogen ist aus der DE 22 07 983 B2 bekannt. Die Einrichtung soll das Ausstäuben von Puder über die Grenzen des Wirkungsbereiches hinaus verhindern und eine Puderrückgewinnung ermöglichen. Oberhalb der Bogenförderebene ist ein Puderzuführrohr angeordnet aus dem mittels Druckluft Puder auf den Bogen aufgestäubt wird. In Bogenförderrichtung vor und nach dem Puderzuführrohr ist als Blasvorhang je ein Blasrohr mit zugeordnetem Saugrohr angeordnet, durch die überschüssiger Puder absaugbar ist. Die Austrittsöffnungen der Austrittsdüsen sind zur Bogenförderebene im rechten Winkel, d.h. senkrecht angeordnet.A pollination device for powder pollination of freshly printed sheets is known from DE 22 07 983 B2. The facility is said to be the dusting of Prevent powder beyond the limits of the effective range and powder recovery enable. Above the sheet conveying level is a powder feed tube arranged from the powder dusted on the sheet by means of compressed air becomes. In the sheet conveying direction before and after the powder feed tube is as Blow curtain each arranged a blow pipe with an associated suction pipe through which excess powder can be sucked off. The outlet openings of the outlet nozzles are at right angles to the sheet conveying plane, i.e. arranged vertically.

Aus der DE 42 07 118 A1 ist unter anderem bekannt, daß ein Puderkasten in Förderrichtung nach der Puderdüsenanordnung einen größeren Abstand als vor dieser aufweist. Dabei ist in Förderrichtung nach der Puderanordnung eine Luftdüsenanordnung vorhanden, deren Blasluft entgegen der Förderrichtung strömt. Mittels eines durch Druckluft erzeugbaren Luftvorhanges wird der Puderbereich abgeschottet, wobei Luft und Puder abgesaugt werden. From DE 42 07 118 A1 it is known, among other things, that a powder box in Direction of conveyance after the powder nozzle arrangement a greater distance than before this has. There is an air nozzle arrangement in the conveying direction after the powder arrangement available, the blown air flows against the direction of conveyance. The powder area is created by means of an air curtain that can be generated by compressed air sealed off, whereby air and powder are sucked off.

Weiterhin ist aus dem DE 295 17 283 U1 eine Pudereinrichtung im Ausleger einer Druckmaschine bekannt. Die Einrichtung besitzt ein Gebläse, vorzugsweise einen Axialventilator, auf, das einen senkrecht auf die Bogenförderebene gerichteten Luftstrom erzeugt und daß die Puderdüsen in diesem Luftstrom angeordnet sind.Furthermore, from DE 295 17 283 U1 is a powder device in the boom Printing machine known. The device has a blower, preferably one Axial fan, which is directed perpendicular to the sheet conveying plane Airflow generated and that the powder nozzles arranged in this airflow are.

Nachteilig bei diesen Ausführungen ist es, daß das unkontrollierte Austreten von Bestäubungsmaterial in die Druckmaschine, insbesondere im Bogenausleger, nicht ausreichend verhindert wird. Dies führt zu Maschinenverschmutzungen, die durch ein zu üppiges Dosieren von Bestäubungsmaterial noch verstärkt werden. Die Verwendung von Blas- und Saugrohren als Luftvorhang schafft zusätzliche Turbulenzen und verwirbelt Puder, wobei die Turbulenzen in Verbindung mit vorbeilaufenden Greifersystemen während des Bestäubungsprozesses noch verstärkt werden können. Weiterhin ist vor allen bei höheren Maschinengeschwindigkeiten (> 8.000 Bogen/Stunde) die im Bestäubungsprozeß erzielbare Qualität unbefriedigend. So sind häufig die im Greiferschluß fixierten Bedruckstoffe im Bereich der Vorderkante ungenügend bestäubt, was zum Ablegen der bogenförmigen Bedruckstoffe an der Vorderkante im Auslegerstapel führt.A disadvantage of these designs is that the uncontrolled leakage of Pollination material in the printing press, especially in the sheet delivery, is not sufficiently prevented. This leads to machine contamination are exacerbated by excessive dosing of pollination material. The use of blow and suction pipes as an air curtain creates additional Turbulence and swirling powder, the turbulence in connection with passing Gripper systems reinforced during the pollination process can be. Furthermore, especially at higher machine speeds (> 8,000 sheets / hour) the quality that can be achieved in the pollination process unsatisfactory. For example, the substrates fixed in the gripper closure are often in the Area of the leading edge insufficiently dusted, causing the arch to be deposited Leads on the leading edge in the delivery stack.

Gemäß EP-A-0074045 ist eine Vorrichtung zum Aufbringen von Puderteilchen auf einen bedruckten Bogen im Ausleger einer Druckmaschine bekannt. Mittels einer einen Gasstrom erzeugenden Sprüheinrichtung werden Puderteilchen auf den Bogen transportiert. Die Sprüheinrichtung ist außerhalb und unterhalb des von einem endlos umlaufenden Kettenfördersystems umschlungenen Bereiches angeordnet, so daß der Puderstrom lediglich auf die Bogenunterseite gerichtet ist. Vor dem Austritt von Puderteilchen an einer Öffnung der Sprüheinrichtung ist ein Teil des Puderstromes innerhalb der Sprüheinrichtung über einen Auslaßkanal absaugbar. In einer Ausbildung ist der Sprüheinrichtung eine Elektrode zum elektrischen Aufladen des Bogens mit bestimmter Polarität zugeordnet. Weiterhin ist eine weitere Elektrode zum elekrischen Aufladen der Puderteilchen mit entgegengesetzter Polarität vorgesehen. Ist über der Öffnung kein Bogen vorhanden, tritt auch kein aufgeladenes Pudermaterial an dieser Öffnung aus. Der Puderstrom wird dabei durch einen vorherrschenden Unterdruck zum Auslaßkanal hingelenkt.According to EP-A-0074045, a device for applying powder particles is on known a printed sheet in the delivery of a printing press. By means of a a spray device generating gas flow, powder particles are placed on the Bow transported. The spray device is outside and below that of arranged in an endlessly encircling chain conveyor system, so that the powder flow is only directed towards the underside of the sheet. Before powder particles emerge from an opening of the spray device, there is a Part of the powder flow within the spray device via an outlet channel extractable. In one embodiment, the spray device is an electrode for electrical Charging the arc associated with certain polarity. Still is another electrode for electrically charging the powder particles with the opposite one Polarity provided. If there is no arch over the opening, kick also no charged powder material from this opening. The powder stream is directed towards the outlet channel by a prevailing negative pressure.

Aufgabe der Erfindung ist es ein Bestäubungsverfahren zu schaffen, das die genannten Nachteile vermeidet, insbesondere eine gleichmäßigere Bestäubung der Bedruckstoffe gewährleistet und den Verbrauch an Bestäubungsmaterial spürbar reduziert.The object of the invention is to provide a pollination process that the above Avoids disadvantages, especially a more uniform pollination of the Substrates guaranteed and the consumption of pollination material noticeable reduced.

Die Aufgabe wird erfindungsgemäß durch die Ausbildungsmerkmale des Patentanspruches 1 gelöst. Weiterbildungen ergeben sich aus den Unteransprüchen.The object is achieved by the training features of the claim 1 solved. Further training results from the subclaims.

Erfindungsgemäß wird innerhalb einer Bestäubungseinrichtung eine stationäre Strömung, aufgebaut, die an Austrittsdüsen getrennt als Bestäubungsmaterial und Druckluft, bzw. als ein Gemisch aus Bestäubungsmaterial und Druckluft, in einer festgelegten Strömungsrichtung austreten. Dabei soll der bekannte Aufbau eines Blasvorhanges vermieden werden, indem der Volumenstrom vollständig oder teilweise bereits an den Düsen abgesaugt und in einem Kreislaufsystem der Bestäubungseinrichtung zur Wiederverwendung wieder zugeführt wird. Der nicht abgesaugte Volumenstrom , welcher in Strömungsrichtung auf den Bedruckstoff auftrifft, wird dabei abhängig vom Bedruckstoffbreitenformat, und/oder dem Bedruckstofflängenformat bzw. dem Druckbild (Sujet) entsprechend gesteuert auf den Bedruckstoff transportiert. According to the invention, a stationary device is installed inside a pollination device Flow, built up as a pollination material and separated at outlet nozzles Compressed air, or as a mixture of pollination material and compressed air, in one flow direction. The known structure of a Blow curtain can be avoided by the volume flow completely or partially already sucked off at the nozzles and in a circulation system of the pollination device is fed back for reuse. The not vacuumed Volume flow that hits the substrate in the direction of flow, becomes dependent on the substrate width format and / or the substrate length format or the print image (subject) controlled according to the substrate transported.

Vorteil dieser Lösung ist, daß Turbulenzen nur geringen Einfluß auf den Volumenstrom erhalten, da überschüssiges Bestäubungsmaterial direkt am Austritt an den Düsen abgesaugt wird. Des weiteren werden durch das unmittelbare Absaugen an den Austrittsdüsen die Reaktionszeiten verkürzt, so daß auch bei hohen Maschinengeschwindigkeiten ein zu üppiges Pudern vermeidbar wird. Durch das Absaugen an den Düsen oder das Abzweigen eines Teilstromes innerhalb der Bestäubungseinrichtung wird lediglich der erforderliche Volumenstrom zum Bedruckstoff geführt. Damit ist auch eine spürbare Senkung des Verbrauches an Bestäubungsmaterial erzielbar. Durch ein gesteuertes Absaugen, wahlweise nach den Kriterien: - Formatlänge, - Formatbreite, - Druckbild, ist eine weitere Verbrauchssenkung erzielbar.The advantage of this solution is that turbulence has little influence on the volume flow obtained because excess pollination material is sucked off directly at the outlet at the nozzles becomes. Furthermore, the reaction times are due to the direct suction at the outlet nozzles shortened, so that even at high machine speeds too much Powder becomes avoidable. By vacuuming on the nozzles or branching off one Partial flow within the pollination device is only the required volume flow led to the substrate. This is also a noticeable reduction in consumption of pollinating material achievable. By controlled suction, optionally after the criteria: - format length, - format width, - print image, is a further reduction in consumption achievable.

Die Erfindung soll an einem Ausführungsbeispiel näher erläutert werden.The invention will be explained in more detail using an exemplary embodiment.

In einer Mehrfarben-Offsetdruckmaschine ist im Ausleger eine Bestäubungseinrichtung angeordnet, die wenigstens eine über die maximale Formatbreite des Bedruckstoffes sich erstreckende Reihe von Düsen aufweist. Die Düsen dienen dem getrennten Austritt von Druckluft bzw. von Bestäubungsmaterial oder auch für den Austritt eines Gemisches von Bestäubungsmaterial und Druckluft.
Zu Beginn des Bestäubungsvorganges wird zunächst das an den Düsen austretende Bestäubungsmaterial z.B. durch eine Absaugeinrichtung vollständig über die komplette Formatbreite abgesaugt. Bei Ankunft des ersten Bogens im Bereich der Bestäubungseinrichtung wird der austretende Volumenstrom z.B. durch eine Absaugeinrichtung formatbreitenabhängig abgesaugt und einem Kreislauf zurückgeführt. Der nicht abgesaugte Volumenstrom tritt weiter aus den Düsen aus und trifft in einem spitzen Winkel zur Förderebene und in Förderrichtung des Bedruckstoffes geneigt auf den Bedruckstoff auf. Die Absaugung des Bestäubungsmaterials an den Düsen erfolgt zusätzlich abhängig von der Formatlänge des Bedruckstoffes und /oder abhängig von der Formatbreite des Bedruckstoffes und/oder abhängig vom Druckbild. Die Steuerung der formatbreiten-, formatlängen- bzw. druckbildabhängigen Absaugung erfolgt vorzugsweise von einem Leitstand aus.
Zur Dosierung des Volumenstromes aus Druckluft und Bestäubungsmaterial kann bereits innerhalb der Bestäubungseinrichtung durch eine innere Absaugung vor den Düsen ein Teilvolumenstrom abgezweigt werden. Der Teilvolumenstrom wird dann direkt der Bestäubungseinrichtung in einem Kreislauf zugeführt.In a multi-color offset printing machine, a pollination device is arranged in the delivery, which has at least one row of nozzles extending over the maximum format width of the printing material. The nozzles are used for the separate discharge of compressed air or pollination material or for the discharge of a mixture of pollination material and compressed air.
At the beginning of the pollination process, the pollinating material emerging at the nozzles is first sucked off completely over the entire width of the format, for example by a suction device. When the first sheet arrives in the area of the dusting device, the exiting volume flow is sucked off depending on the format width, for example by a suction device, and returned to a circuit. The volume flow not sucked out continues to emerge from the nozzles and strikes the printing material at an acute angle to the conveying plane and in the conveying direction of the printing material. The dusting of the dusting material at the nozzles is additionally dependent on the format length of the printing material and / or on the format width of the printing material and / or depending on the print image. The control of the format width, format length or print image dependent suction is preferably carried out from a control center.
To meter the volume flow of compressed air and dusting material, a partial volume flow can already be branched off within the dusting device by means of an internal suction in front of the nozzles. The partial volume flow is then fed directly to the pollination device in a circuit.

Claims (4)

  1. Process for dusting a printed material in a printing press by means of a dusting device with at least one row of nozzles extending across the maximum format width of the printed material, with a volumetric flow emerging towards the printed material partially feedable back to the dusting device, characterised in that the continuously generated volumetric flow of dusting material and compressed air at the beginning of the dusting process outside the dusting device is sucked away directly to this and fed back in a circuit of the dusting device and that on arrival of the first printed sheet in the region of the dusting device, the volumetric flow emerging across the format width to be worked at after outflow at the nozzles is furthermore fed back and that the non-sucked away volumetric flow is fed towards the feed plane and inclined in the feed direction of the printed material toward the printed material.
  2. Process according to Claim 1, characterised in that the non-sucked away volumetric flow is fed dependent upon the format width of the printed material to this.
  3. Process according to Claim 1, characterised in that the non-sucked away volumetric flow of the printed material is fed dependent upon the format length of the printed material to this.
  4. Process according to Claim 1, characterised in that the non-sucked away volumetric flow is fed towards the printed material dependent upon the respective printed image.
EP97117530A 1996-10-31 1997-10-10 Powdering method, specially for printed sheet materials in a printing machine Expired - Lifetime EP0839651B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19643986A DE19643986A1 (en) 1996-10-31 1996-10-31 Process for dusting, preferably a sheet-shaped printing material in a printing machine
DE19643986 1996-10-31

Publications (2)

Publication Number Publication Date
EP0839651A1 EP0839651A1 (en) 1998-05-06
EP0839651B1 true EP0839651B1 (en) 2000-07-12

Family

ID=7809719

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97117530A Expired - Lifetime EP0839651B1 (en) 1996-10-31 1997-10-10 Powdering method, specially for printed sheet materials in a printing machine

Country Status (3)

Country Link
EP (1) EP0839651B1 (en)
AT (1) ATE194549T1 (en)
DE (2) DE19643986A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19901245A1 (en) * 1998-02-17 1999-08-19 Heidelberger Druckmasch Ag Printed sheet powder dusting system, e.g. for high speed rotary printing machine

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2591043A (en) * 1947-04-19 1952-04-01 Virkotype Corp Powder separator and dispenser
DE2207983C3 (en) * 1972-02-21 1980-05-29 Albin Platsch Zerstaeubungstechnik, 7000 Stuttgart Powder dusting device
DE3135220A1 (en) * 1981-09-05 1983-03-17 Weitmann & Konrad GmbH & Co KG, 7022 Leinfelden-Echterdingen DEVICE FOR APPLYING POWDER PARTICLES
US4882992A (en) * 1988-07-29 1989-11-28 Airtech Company, Inc. Combination powder applying and/or infrared drying attachment for printing presses
DE4427904A1 (en) * 1994-08-06 1996-02-08 Hans Platsch Powder sprayer

Also Published As

Publication number Publication date
ATE194549T1 (en) 2000-07-15
DE59702005D1 (en) 2000-08-17
EP0839651A1 (en) 1998-05-06
DE19643986A1 (en) 1998-05-07

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