EP0516924A1 - Device for increasing the heat transfer to cooling cylinders of offset rotary machines - Google Patents

Device for increasing the heat transfer to cooling cylinders of offset rotary machines Download PDF

Info

Publication number
EP0516924A1
EP0516924A1 EP19920104019 EP92104019A EP0516924A1 EP 0516924 A1 EP0516924 A1 EP 0516924A1 EP 19920104019 EP19920104019 EP 19920104019 EP 92104019 A EP92104019 A EP 92104019A EP 0516924 A1 EP0516924 A1 EP 0516924A1
Authority
EP
European Patent Office
Prior art keywords
cooling
heat transfer
material web
increasing
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.)
Withdrawn
Application number
EP19920104019
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German (de)
French (fr)
Inventor
Ernst August Hahne
Heino Petersen
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.)
Eltex Elektrostatik GmbH
Original Assignee
Eltex Elektrostatik GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Eltex Elektrostatik GmbH filed Critical Eltex Elektrostatik GmbH
Publication of EP0516924A1 publication Critical patent/EP0516924A1/en
Withdrawn legal-status Critical Current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
    • B41F23/0476—Cooling
    • B41F23/0479—Cooling using chill rolls

Definitions

  • the invention relates to a device for increasing the heat transfer on chill rolls of offset roll rotating machines.
  • the material web is passed through a drying device after the printing process has been completed, in which the solvents of the ink are evaporated or oxidized. Drying can be carried out using hot air or gas flames acting directly on the material web. After drying, the material web is passed over cooling rollers, whereby the heated printing ink and the material web are brought back to normal temperature. With intensive cooling, the color solidifies completely and cannot smear during further processing.
  • a known device for removing the re-evaporated mineral oils consists of a so-called "dynamic boundary layer doctor".
  • This dynamic boundary layer squeegee is located directly behind the dryer and reduces the post-evaporated mineral oils between the dryer and the first cooling roller by inflating air, which is fed into an air circuit that is connected to a condenser for separating the mineral oils.
  • This device is very complex and yet does not lead to an optimal printing result, since not enough mineral oil vapors are scraped off and therefore lead to smearing of the printed material.
  • a narrow air jet is directed against the material web in the inlet area of the material web cooling roller in order to press it more firmly against the cooling roller.
  • the invention has for its object to provide a device for increasing the heat transfer to the cooling rollers of offset web presses, which enables technically simple means higher printing speeds with improved print quality.
  • the row of charging electrodes causes the air gap to be greatly reduced due to electrostatic forces. This effect occurs at a certain charging voltage, which depends on the climatic conditions in the room and the material moisture. Since the material web is almost in contact with the cooling roller in the wrapping area, the heat present in the material web can be dissipated more easily and quickly via the cooling roller, so that mineral oil vapor is no longer present and smearing of the printed goods is impossible.
  • the heat transfer at the first cooling rolls is improved in such a way that it is possible to make do with a smaller number of cooling rolls.
  • reference number 10 denotes a small, cut-out section of a cooling roll.
  • a material web 20 moves in the direction of arrow 100 with the cooling roller 10, an air gap being present between the two.
  • a first charging electrode 40 which has a length that corresponds at least to the width of the material web 20, is arranged near the inlet region of the material web 20 at a short distance from the cooling roll surface.
  • the charging electrode 40 is preferably aligned axially parallel to the cooling roller axis.
  • a second charging electrode 50 is arranged on the second cooling roller similar to the first charging electrode 40 on the first cooling roller.
  • charging electrodes can also be provided on the following cooling rollers.

Abstract

The device for increasing the heat transfer to cooling cylinders (10) of offset web-fed rotary machines has a row of supercharging electrodes (40, 50) which is arranged in the inlet region of the web of material (20) and the cooling cylinder (10) for reducing the air gap present between the web of material and the cooling cylinder. <IMAGE>

Description

Die Erfindung betrifft eine Vorrichtung zur Erhöhung des Wärmeübergangs an Kühlwalzen von Offset-Rollenrotationsmaschinen.The invention relates to a device for increasing the heat transfer on chill rolls of offset roll rotating machines.

Beim Offset-Druck mit Rollenrotationsmaschinen wird die Materialbahn nach beendetem Druckvorgang durch eine Trockeneinrichtung geleitet, in der die Lösungsmittel der Farbe verflüchtigt bzw. oxidiert werden. Die Trocknung kann mittels Heißluft oder unmittelbar auf die Materialbahn wirkender Gasflammen erfolgen. Im Anschluß an die Trocknung wird die Materialbahn über Kühlwalzen geführt, wodurch die erhitzte Druckfarbe sowie die Materialbahn wieder auf die normale Temperatur gebracht werden. Bei intensiver Kühlung erstarrt die Farbe völlig und kann bei der Weiterverarbeitung nicht abschmieren.In offset printing with web-fed rotary machines, the material web is passed through a drying device after the printing process has been completed, in which the solvents of the ink are evaporated or oxidized. Drying can be carried out using hot air or gas flames acting directly on the material web. After drying, the material web is passed over cooling rollers, whereby the heated printing ink and the material web are brought back to normal temperature. With intensive cooling, the color solidifies completely and cannot smear during further processing.

Durch die erhöhten Druckgeschwindigkeiten werden die an der Materialbahn und an der Kühlwalzenoberfläche haftenden Luftgrenzschichten in den von der Materialbahn umschlungenen Bereich der Kühlwalze gefördert und bilden dort ein Luftpolster. Dadurch wird der Wärmetransport erheblich beeinträchtigt, und es sammeln sich an der Kühlwalzenoberfläche kondensierte Mineralöle an.Due to the increased printing speeds, the air boundary layers adhering to the material web and to the cooling roller surface are conveyed into the area of the cooling roller which is wrapped by the material web and form an air cushion there. This significantly affects the heat transfer and condensed mineral oils collect on the surface of the chill roll.

Bei langsam laufenden Offset-Rollenrotationsmaschinen (ca. 5 m/s), bei denen sich die Materialbahn in gutem Kontakt zur Kühlwalze befindet, wird das Mineralölkondensat von der Materialbahn ohne Beeinträchtigung der Druckqualität abtransportiert.In slow-running offset web presses (approx. 5 m / s) in which the material web is in good contact with the chill roll, the mineral oil condensate is removed from the material web without impairing the print quality.

Ab einer von der Geometrie und dem spezifischen Bahnzug abhängigen kritischen Geschwindigkeit hebt die Materialbahn jedoch von der Kühlwalze ab und es bildet sich der Luftspalt mit mineralölhaltiger Luft. Das hat zur Folge, daß sich auf der ersten Kühlwalze Mineralöl ansammelt, wodurch die Farbe wieder angelöst wird und das Druckprodukt verschmiert.From a critical speed dependent on the geometry and the specific web tension, however, the material web lifts off the chill roll and the air gap with air containing mineral oil is formed. As a result, mineral oil collects on the first cooling roller, which redissolves the ink and smears the printed product.

Mit steigender Geschwindigkeit nimmt die Wärmedurchgangszahl vom Bedruckstoff bzw. der Materialbahn zur Kühlwalzenoberfläche stetig ab. Es liegt nahe, daß das Anwachsen eines Wärmewiderstandes abhängig ist von der Dicke des eingeschlossenen Luftspalts.As the speed increases, the heat transfer coefficient from the substrate or the material web to the chill roll surface steadily decreases. It is obvious that the increase in thermal resistance depends on the thickness of the enclosed air gap.

Eine bekannte Vorrichtung zur Beseitigung der nachverdampften Mineralöle besteht aus einem sogenannten "dynamischen Grenzschichtrakel". Dieses dynamische Grenzschichtrakel ist direkt hinter dem Trockner angeordnet und reduziert die nachverdampften Mineralöle zwischen Trockner und erster Kühlwalze durch Aufblasen von Luft, die in einen Luftkreislauf geführt wird, der an einen Kondensator zum Absondern der Mineralöle angeschlossen ist.A known device for removing the re-evaporated mineral oils consists of a so-called "dynamic boundary layer doctor". This dynamic boundary layer squeegee is located directly behind the dryer and reduces the post-evaporated mineral oils between the dryer and the first cooling roller by inflating air, which is fed into an air circuit that is connected to a condenser for separating the mineral oils.

Diese Vorrichtung ist sehr aufwendig und führt dennoch nicht zu einem optimalen Druckergebnis, da nicht genügend Mineralöldämpfe abgerakelt werden und daher zu einem Verschmieren des bedruckten Materials führen.This device is very complex and yet does not lead to an optimal printing result, since not enough mineral oil vapors are scraped off and therefore lead to smearing of the printed material.

Bei dem sogenannten Chill-Jet-Verfahren wird im Einlaufbereich der Materialbahn-Kühlwalze ein schmaler Luftstrahl gegen die Materialbahn gerichtet um sie fester gegen die Kühlwalze zu drücken.In the so-called chill jet process, a narrow air jet is directed against the material web in the inlet area of the material web cooling roller in order to press it more firmly against the cooling roller.

Aber auch diese Vorrichtung ist bei höheren Druckgeschwindigkeiten unzureichend, da wiederum eine Mineralölkondensation auftritt, was zum Ablegen von Farbe an der Kühlwalze führt und die Druckqualität stark vermindert.However, this device is also inadequate at higher printing speeds, since mineral oil condensation occurs again, which leads to ink being deposited on the cooling roller and greatly reducing the print quality.

Der Erfindung liegt die Aufgabe zugrunde, eine Vorrichtung zur Erhöhung des Wärmeübergangs an Kühlwalzen von Offset-Rollenrotationsmaschinen anzugeben, die mit technisch einfachen Mitteln höhere Druckgeschwindigkeiten mit verbesserter Druckqualität ermöglicht.The invention has for its object to provide a device for increasing the heat transfer to the cooling rollers of offset web presses, which enables technically simple means higher printing speeds with improved print quality.

Die erfindungsgemäße Lösung dieser Aufgabe ist im Hauptanspruch angegeben.The achievement of this object is specified in the main claim.

Die Aufladeelektrodenreihe bewirkt, daß der Luftspalt aufgrund elektrostatischer Kräfte stark verringert wird. Diese Wirkung tritt bei einer bestimmten Aufladespannung ein, die von den klimatischen Bedingungen im Raum und von der Materialfeuchte abhängt. Da dadurch die Materialbahn fast an der Kühlwalze im Umschlingungsbereich anliegt, kann die in der Materialbahn vorhandene Wärme leichter und schneller über die Kühlwalze abgeführt werden, so daß kein Mineralöldampf mehr vorhanden und eine Verschmierung der bedruckten Ware ausgeschlossen ist.The row of charging electrodes causes the air gap to be greatly reduced due to electrostatic forces. This effect occurs at a certain charging voltage, which depends on the climatic conditions in the room and the material moisture. Since the material web is almost in contact with the cooling roller in the wrapping area, the heat present in the material web can be dissipated more easily and quickly via the cooling roller, so that mineral oil vapor is no longer present and smearing of the printed goods is impossible.

Zur weiteren Optimierung ist die Anordnung weiterer Aufladeelektroden an der zweiten und dritten Kühlwalze vorteilhaft. Dadurch wird der Luftspalt weiter reduziert.The arrangement of further charging electrodes on the second and third cooling rolls is advantageous for further optimization. This further reduces the air gap.

Durch die elektrostatische Aufladung wird der Wärmeübergang an den ersten Kühlwalzen derart verbessert, daß dadurch die Möglichkeit besteht, mit einer geringeren Anzahl Kühlwalzen auszukommen.Due to the electrostatic charge, the heat transfer at the first cooling rolls is improved in such a way that it is possible to make do with a smaller number of cooling rolls.

Im folgenden wird unter Bezugnahme auf die Zeichnung ein Ausführungsbeispiel näher beschrieben.In the following an embodiment will be described with reference to the drawing.

In der Zeichnung ist mit der Bezugsziffer 10 ein kleiner, geschnittener Ausschnitt einer Kühlwalze bezeichnet. Eine Materialbahn 20 bewegt sich in Laufrichtung des Pfeils 100 mit der Kühlwalze 10, wobei ein Luftspalt zwischen beiden vorhanden ist.In the drawing, reference number 10 denotes a small, cut-out section of a cooling roll. A material web 20 moves in the direction of arrow 100 with the cooling roller 10, an air gap being present between the two.

In der Nähe des Einlaufbereichs der Materialbahn 20 ist mit kurzem Abstand zur Kühlwalzenmantelfläche eine erste Aufladungselektrode 40 angeordnet, die eine Länge aufweist, die mindestens der Breite der Materialbahn 20 entspricht. Die Aufladungselektrode 40 ist vorzugsweise achsparallel zur Kühlwalzenachse ausgerichtet.A first charging electrode 40, which has a length that corresponds at least to the width of the material web 20, is arranged near the inlet region of the material web 20 at a short distance from the cooling roll surface. The charging electrode 40 is preferably aligned axially parallel to the cooling roller axis.

In Laufrichtung des Pfeils 100 gesehen, ist eine zweite Aufladeelektrode 50 an der zweiten Kühlwalze ähnlich wie die erste Aufladeelektrode 40 an der ersten Kühlwalze angeordnet.Seen in the direction of the arrow 100, a second charging electrode 50 is arranged on the second cooling roller similar to the first charging electrode 40 on the first cooling roller.

Falls notwendig, können an den folgenden Kühlwalzen ebenfalls Aufladeelektroden vorgesehen werden.If necessary, charging electrodes can also be provided on the following cooling rollers.

Claims (3)

Vorrichtung zur Erhöhung des Wärmeübergangs an Kühlwalzen von Offset-Rollenrotationsmaschinen zum Abkühlen einer bedruckten und getrockneten Materialbahn (20),

gekennzeichnet durch

eine Aufladeelektrode (40), die in dem Bereich angeordnet ist, in dem die Materialbahn (20) an der ersten Kühlwalze (10) einläuft.Device for increasing the heat transfer on chill rolls of offset roll rotating machines for cooling a printed and dried material web (20),

marked by

a charging electrode (40) which is arranged in the region in which the material web (20) runs in on the first cooling roller (10). Vorrichtung nach Anspruch 1, gekennzeichnet durch eine zweite Aufladeelektrode (50), die der ersten Aufladelektrode (40) in Laufrichtung an der nächsten Kühlwalze nachgeschaltet ist.Apparatus according to claim 1, characterized by a second charging electrode (50) which is connected downstream of the first charging electrode (40) in the running direction on the next cooling roller. Vorrichtung nach Anspruch 2, gekennzeichnet durch weitere Aufladeelektroden an den in Laufrichtung (100) nachfolgenden Kühlwalzen.Device according to claim 2, characterized by further charging electrodes on the cooling rollers following in the running direction (100).
EP19920104019 1991-06-07 1992-03-09 Device for increasing the heat transfer to cooling cylinders of offset rotary machines Withdrawn EP0516924A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4118807A DE4118807C2 (en) 1991-06-07 1991-06-07 Device for increasing the heat transfer on chill rolls of offset roll rotating machines
DE4118807 1991-06-07

Publications (1)

Publication Number Publication Date
EP0516924A1 true EP0516924A1 (en) 1992-12-09

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EP19920104019 Withdrawn EP0516924A1 (en) 1991-06-07 1992-03-09 Device for increasing the heat transfer to cooling cylinders of offset rotary machines

Country Status (4)

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US (1) US5275103A (en)
EP (1) EP0516924A1 (en)
JP (1) JPH05169631A (en)
DE (2) DE4118807C2 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995015854A1 (en) * 1993-12-11 1995-06-15 Eltex-Elektrostatik Gmbh Device and process for producing printed sheets
EP1201429A2 (en) * 2000-10-24 2002-05-02 Heidelberger Druckmaschinen Aktiengesellschaft Method and device for cooling a material web
DE102005052136A1 (en) * 2005-10-28 2007-05-03 Koenig & Bauer Ag Device for increasing heat transfer in chill roll, has chill roll cooperating with impression roller, is provided in chill roll stand and electrostatic field is formed between impression roller and chill roll
EP1795347A2 (en) 2005-10-28 2007-06-13 Koenig &amp; Bauer Aktiengesellschaft Support for cooling roll and method of cooling a web guided through the support

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US5465661A (en) * 1994-10-11 1995-11-14 R. R. Donnelley & Sons Company Printing press temperature adjustment system
US5562037A (en) * 1994-12-02 1996-10-08 Kimberly-Clark Corporation Single substrate, repeat-pass printing process
US5520112A (en) * 1994-12-02 1996-05-28 Kimberly-Clark Corporation Folded substrate, dual-sided printing process and substrates printed thereby
US5501149A (en) * 1994-12-02 1996-03-26 Kimberly-Clark Corporation Dual substrate, single-pass printing process
US6231715B1 (en) 1994-12-20 2001-05-15 Kimberly-Clark Worldwide, Inc. Elongate, semi-tone printing process
CA2214486C (en) * 1996-09-04 2006-06-06 Consolidated Papers, Inc. Method and apparatus for minimizing web-fluting in heat-set, web-offset printing presses
DE19710124B4 (en) * 1997-03-12 2006-03-16 Goss Contiweb B.V. Method and device for controlling the temperature of cooling rollers
US5881647A (en) * 1997-08-29 1999-03-16 Hurletron, Incorporated Printing press with electrostatic cooling
US6376024B1 (en) 1999-05-28 2002-04-23 Hurletron, Incorporated Web processing with electrostatic cooling
US6076466A (en) * 1999-05-28 2000-06-20 Hurletron, Incorporated Printing press with electrostatic cooling and method of operating
US6299685B1 (en) 2000-02-11 2001-10-09 Hurletron, Incorporated Web processing with electrostatic moistening
US6606948B1 (en) 2002-03-11 2003-08-19 Heidelberger Druckmaschinen Ag Method for controlling a chill roll system
US7432413B2 (en) 2005-12-16 2008-10-07 The Procter And Gamble Company Disposable absorbent article having side panels with structurally, functionally and visually different regions
CA2671929C (en) 2006-12-04 2013-03-19 The Procter & Gamble Company Absorbent articles comprising graphics
DE102010042033A1 (en) 2010-10-06 2012-04-12 Windmöller & Hölscher Kg Rotary printing machine for printing a substrate and method for monitoring characteristics of the pressure applied to the printing medium
WO2013170433A1 (en) 2012-05-15 2013-11-21 The Procter & Gamble Company Absorbent article having characteristic waist end
DE102019108765A1 (en) * 2019-04-03 2020-10-08 Koenig & Bauer Ag Printing machine and process for producing printed products
CN110000058A (en) * 2019-04-11 2019-07-12 中山市旭森涂层材料有限公司 A kind of Sticky Note coating system and coating process

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995015854A1 (en) * 1993-12-11 1995-06-15 Eltex-Elektrostatik Gmbh Device and process for producing printed sheets
EP1201429A2 (en) * 2000-10-24 2002-05-02 Heidelberger Druckmaschinen Aktiengesellschaft Method and device for cooling a material web
EP1201429A3 (en) * 2000-10-24 2007-10-03 Goss Contiweb B.V. Method and device for cooling a material web
DE102005052136A1 (en) * 2005-10-28 2007-05-03 Koenig & Bauer Ag Device for increasing heat transfer in chill roll, has chill roll cooperating with impression roller, is provided in chill roll stand and electrostatic field is formed between impression roller and chill roll
EP1795347A2 (en) 2005-10-28 2007-06-13 Koenig &amp; Bauer Aktiengesellschaft Support for cooling roll and method of cooling a web guided through the support
DE102005052136B4 (en) * 2005-10-28 2008-07-10 Koenig & Bauer Aktiengesellschaft Device for increasing the heat transfer to a cooling roller
EP1795347A3 (en) * 2005-10-28 2010-10-27 Koenig & Bauer Aktiengesellschaft Support for cooling roll and method of cooling a web guided through the support

Also Published As

Publication number Publication date
JPH05169631A (en) 1993-07-09
DE9116646U1 (en) 1993-06-03
DE4118807A1 (en) 1992-12-10
US5275103A (en) 1994-01-04
DE4118807C2 (en) 1995-07-20

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