EP0924075B1 - Dispositif et procédé destiné à combattre la production d'eau de condensation dans les machines à imprimer - Google Patents

Dispositif et procédé destiné à combattre la production d'eau de condensation dans les machines à imprimer Download PDF

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Publication number
EP0924075B1
EP0924075B1 EP98123035A EP98123035A EP0924075B1 EP 0924075 B1 EP0924075 B1 EP 0924075B1 EP 98123035 A EP98123035 A EP 98123035A EP 98123035 A EP98123035 A EP 98123035A EP 0924075 B1 EP0924075 B1 EP 0924075B1
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EP
European Patent Office
Prior art keywords
temperature
dampening
unit
control unit
air
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
EP98123035A
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German (de)
English (en)
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EP0924075A1 (fr
Inventor
Daniel Paul Gagne
Charles Douglas Lyman
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.)
Heidelberger Druckmaschinen AG
Original Assignee
Heidelberger Druckmaschinen AG
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Publication of EP0924075A1 publication Critical patent/EP0924075A1/fr
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F33/00—Indicating, counting, warning, control or safety devices
    • B41F33/0054—Devices for controlling dampening
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F31/00—Inking arrangements or devices
    • B41F31/002—Heating or cooling of ink or ink rollers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F7/00—Rotary lithographic machines
    • B41F7/20—Details
    • B41F7/24—Damping devices

Definitions

  • the present invention relates to a device for avoidance formation of condensation in printing machines according to the preamble of claim 1, as well as a corresponding method according to claim 6.
  • Condensed water can e.g. B. on the surface of a protective shield in the form of Droplets occur that can collect in drops, which then either on the Surface of the material web to be printed or fall into the printing unit itself and Cause printing defects and other undesirable conditions. Condensation under the Material web can also cause printing defects, for example if there are droplets fall onto the surfaces of the jack rollers of a lower printing unit.
  • condensation on the surface of Printing unit rollers especially on the rollers in the dampening system Printing machine, a harmful effect on the water / fountain solution in the Have offset printing process, d. H. that the dampening solution on a roller additional condensed water exceeds the absorption capacity of the pressure gap can, so that excess water accumulates in the pressure gap, which is an erratic Water supply and thus a reduction in print quality.
  • Farther condensation water dripping onto the web can immediately cause print image errors and condensation on a roller, especially on dampening rollers, can Destabilize offset printing process.
  • DE-OS 19 20 679 A1 describes a device for keeping constant, control and control of the dampening solution temperature in a dampening unit Offset printing machine, in which the flowing through the dampening roller The amount and temperature of a coolant are kept constant.
  • the script strikes continue to apply cooled air to the dampening unit's roller.
  • the writing does not indicate that the dampening system is exposed to the ambient air isolate and the air temperature, the dampening solution temperature and the temperature of the coolant flowing through the rollers of the dampening system through a Temperature control unit to control and regulate in such a way that the Dampening roller coolant, the dampening solution and the air in the area of the dampening unit in the Have essentially the same temperature.
  • EP 0 437 665 A2 describes a dampening solution temperature control device for Offset printing machines with which the temperature of the dampening solution within a insulated dampening solution reservoir is cooled down and regulated.
  • the regulation the dampening solution temperature depends on the temperature values of the Fountain solution in the dampening box and on the surface of the fountain solution transmitting roller can be measured.
  • JP-A 58 062053 is a printing unit for a sheet-fed rotary offset printing machine known, in which the ink and dampening unit together through a hood are shielded, and at which the temperature of in the interior of the Shielding supplied cooling air is regulated depending on the temperature, measured within the shielded area.
  • the script does not contain any Indication to shield the dampening unit separately and the temperature of the Dampening solution and from flowing through the rollers of the dampening system To control and regulate coolant in such a way that the dampening roller coolant, the The dampening solution and the air in the area of the dampening system are essentially the same Have temperature.
  • FIG. 1 shows an isothermal dampening system according to the present invention.
  • one conventional dampening system as it is in US 5,592,880 and US 5,520,113 described, can be due to high relative humidity and a Temperature difference between the ambient air and the surface of a roller Collect dampening water in the form of condensed water.
  • This Excess water in the dampening system caused by condensation can be the cause for an irregular supply of dampening solution to the printing plate.
  • a Even supply of dampening solution to the printing plate ensures that the temperature of the dampening roller, the temperature of the dampening solution and the temperature of the air in the area of the dampening system by a shown in Fig. 1 Temperature control unit 110 is controlled to a substantially same value.
  • a temperature control unit 110 which with a Dampening unit 105 of a conventional printing unit is connected.
  • This Dampening unit 105 can, for example, comprise a multiplicity of rollers and cylinders, via which a dampening solution on a printing form, for. B. on one on one Plate cylinder of a printing unit of a web offset printing press arranged Pressure plate, is applied.
  • the dampening unit 105 can be isolated from the ambient air be housed in a housing or box. In the same way, the whole Printing unit including the isothermal dampening system 100 enclosed or by be isolated from the ambient air if desired.
  • the temperature control unit 110 may include a programmable control unit 110a, such as a control device based on a conventional microprocessor, which e.g. For example, a temperature of the ambient air, or the air within the dampening unit 105 corresponding signal T A, one of the temperature of the fountain solution corresponding signal T F, an outlet temperature of the water for cooling the rolls corresponding signal T WO and an inlet temperature of the water receives corresponding signal T WI for cooling the rollers.
  • a programmable control unit 110a such as a control device based on a conventional microprocessor, which e.g. For example, a temperature of the ambient air, or the air within the dampening unit 105 corresponding signal T A, one of the temperature of the fountain solution corresponding signal T F, an outlet temperature of the water for cooling the rolls corresponding signal T WO and an inlet temperature of the water receives corresponding signal T WI for cooling the rollers.
  • a dampening solution temperature control unit 115 is also provided with the dampening unit 105 connected, for example a pump and an associated pipeline, via the the dampening solution is fed into the dampening unit 105, a tank that one Contains fountain solution and a heating / cooling unit to regulate the temperature of the Fountain solution - e.g. B. by heating or cooling the dampening solution tank in a known manner Way - can include to keep the fountain solution at a substantially constant Maintain temperature.
  • a roll cooling water temperature control unit 120 is also included with the Dampening unit 105 connected and can e.g. B. a pump and one associated with it Pipe system for the circulation of the liquid through the dampening roller, one Tank that holds a stock of e.g. B. contains water and a heating / cooling unit for Control the temperature of the water fed into the dampening roller (s).
  • An air temperature control unit 125 which is also connected to the dampening unit 105 is, e.g. B. a blower, the air through the as preferably enclosed and insulated unit trained dampening unit 105 blows, a heater that the Air temperature according to the specifications of the temperature control unit 110 if necessary increases as well as a cooling device that the air temperature according to the specifications of Temperature control unit 110 lowers if necessary.
  • HVAC heating, ventilation and air conditioning system
  • the programmable control unit 110a of the temperature control unit 110 receives the input signals T A , T F , T WO and T WI and generates a control signal which is determined as a function of the input signals and a reference temperature T REF .
  • the signals T A , T F , T WO and T WI can either be generated by a sensor that measures the respective values in the dampening system 105, or z. B. from a sensor that measures the respective values in the dampening solution temperature control unit 115 or in the roller cooling water temperature control unit 120.
  • the temperature of the dampening solution which flows both in the dampening unit 105 and in the dampening unit temperature control unit 115, can be measured either at the dampening unit 105 or at the dampening unit temperature control unit 115 and the measured value can be sent to the temperature control unit 110.
  • T REF a reference temperature is for the inventive isothermal dampening system 100.
  • T REF can be, for. B. a predetermined value, ie a temperature value based on the experience of the printing press operator in order to create optimal operating conditions, e.g. B. an operating temperature for the dampening system 100 of approximately 22 ° C (72 ° F), which is preferably stored in a memory of the temperature control unit 110 as a parameter.
  • the T REF value e.g. B. be determined as a function of the temperature of the ambient air in the dampening unit 105, so that the set T REF value z. B can be set essentially equal to the ambient air temperature.
  • the programmable control unit 110a thus receives the signals T A , T F , T WO and T WI and then sends a control signal to the respective components of the isothermal dampening system 100 according to the invention which is at the temperature T REF desired for the dampening system and in each component of the Dampening system 100 prevailing current temperature based.
  • control signal may be the value of T REF which, when received from a particular component, causes the components to be appropriately cooled or heated to maintain the value of T REF .
  • all components ie the air temperature control unit 125, the dampening solution control unit 115 and the roller cooling water temperature control unit 120 are each supplied with the same control signal, e.g. B. the value of T REF , and the components react accordingly, for example by reducing or increasing their temperature to the required extent by adapting their respective operating states, e.g. B. via assigned heating / cooling devices and / or circulation systems.
  • the temperature control unit 110 can send an individual heating or cooling signal to each of the components of the isothermal dampening system 100 instead of the one control signal.
  • B. can be determined depending on T REF in order to bring about a suitable temperature adjustment in the associated receiving unit.
  • FIG. 2 shows an exemplary method for creating an isothermal state according to the present invention.
  • the ambient air temperature T A is determined in a step 200.
  • the temperature of the dampening solution T F is determined in steps 220 and 230.
  • the outlet temperature and the inlet temperature of the roll cooling water are determined in steps 220 and 230.
  • the reference temperature T REF based on either the ambient air temperature or a predetermined value is determined. Steps 200 to 240 can be carried out in any order or even simultaneously.
  • the output signal is determined as a function of at least one of the values T A , T F , T WO , T WI and T REF and sent to the control units 115, 120 and 125, which in response to the control signal adjust their respective temperature carry out so that a substantially isothermal condition for the dampening unit 105 is generated or maintained.
  • this causes the temperature control unit 110 according to the invention generated control signal the control units 115, 120 and 125 for the temperatures of the Dampening rollers, the dampening solution and the air in the area of the dampening unit 105 cause that the temperatures are changed so that they are substantially the same and thus an isothermal state arises in that each of the components of the isothermal dampening system 100 is essentially the same temperature having.
  • the fan of the air temperature control unit 125 in Response to a control signal can be controlled in such a way that by the Dampening unit 105 air is circulated, which if necessary through the heater or through the cooling device of the air temperature control unit 125 is heated or cooled.
  • the heater or the cooling device of the Roll cooling water temperature control unit 120 and the dampening solution temperature control unit 115 can be controlled in response to the control signal Temperature of the roller cooling water and the dampening solution, which over the respective Storage tank and respective pump systems through the isothermal dampening system 100 are circulated to control such that the temperatures of the dampening rollers, the Dampening solution and the air in the area of the dampening system 100 essentially are the same.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)

Claims (7)

  1. Système de dispositif de mouillage isotherme comprenant un dispositif de mouillage (105) muni de cylindres, disposé dans un groupe imprimant d'une machine à imprimer rotative et comprenant une unité de commande (125) destinée à faire varier la température de l'air, une unité de commande (120) destinée à faire varier la température d'un moyen de refroidissement qui circule à travers les cylindres du dispositif de mouillage (105), ainsi qu'une unité de la régulation de la température (110)
       caractérisé    en ce que le dispositif de mouillage (105) est isolé de l'air ambiant, en ce que, en outre, il est prévu qu'une unité de commande (115) destinée à faire varier la température de l'agent de mouillage, et en ce que l'unité de régulation de la température (110) est connectée électriquement à l'unité de commande de la température de l'air (125), à l'unité de commande de la température de l'agent de mouillage (115) ainsi qu'à l'unité de commande de la température de l'agent de refroidissement des cylindres (120), et commande et règle les unités de commande (125, 115, 120) de telle manière que l'agent de refroidissement des cylindres de mouillage, l'agent de mouillage et l'air présent dans la région du dispositif de mouillage (105) présentent sensiblement la même température.
  2. Système de dispositif de mouillage selon la revendication 1,
       caractérisé    en ce qu'il comprend un capteur de température de l'air destiné à capter la température de l'air dans la région du dispositif de mouillage (105), un capteur de température de l'agent de mouillage destiné à capter la température de l'agent de mouillage, un capteur de température de sortie de l'agent de refroidissement des cylindres destiné à capter la température de l'agent de refroidissement qui sort des cylindres, ainsi qu'un capteur de température d'entrée de l'agent de refroidissement des cylindres destiné à capter la température de l'agent de refroidissement qui entre dans les cylindres.
  3. Système de dispositif de mouillage selon la revendication 2,
       caractérisé en ce que l'unité de régulation de la température (110) comprend un unité de commande programmable (110a) qui reçoit en provenance des capteurs un signal d'entrée de la température de l'air, un signal d'entrée de la température de l'agent de mouillage, un signal d'entrée de la température de sortie de l'agent de refroidissement des cylindres, et un signal d'entrée de la température d'entrée de l'agent de refroidissement des cylindres, et qui , en fonction d'au moins un des signaux d'entrée ainsi que d'un signal prédéterminé pour une température de référence (TREF) produit un signal de commande en fonction duquel l'unité de commande de la température de l'air (125) l'unité de commande de la température de l'agent de mouillage (115) ainsi que l'unité de commande de la température de l'eau de refroidissement des cylindres (120) font varier la température de l'air, la température de l'agent de mouillage ainsi que la température de l'agent de refroidissement des cylindres.
  4. Système de dispositif de mouillage selon la revendication 3,
       caractérisé    en ce que le signal de température de référence prédéterminé (TREF) est déterminé sur la base d'une valeur de température pouvant être déterminée ou du signal d'entrée de la température de l'air.
  5. Système de dispositif de mouillage isotherme selon une des revendications 3 ou 4,
       caractérisé,    en ce que l'unité de commande programmable (110a) comprend un microprocesseur
  6. Procédé pour éviter la formation d'eau de condensation dans des dispositifs de mouillage de machines à imprimer rotatives qui comprennent des cylindres, qui présente les étapes de procédé suivantes :
    isoler le dispositif de mouillage de l'air ambiant,
    mesurer la température de l'air dans le dispositif de mouillage,
    mesurer la température de l'agent de mouillage dans le dispositif de mouillage,
    mesurer la température d'un agent de refroidissement qui circule à travers les cylindres du dispositif de mouillage,
    déterminer une température de référence,
    produire un signal de commande en fonction de la température de l'air dans le dispositif de mouillage, de la température de l'agent de mouillage, de la température de l'agent de refroidissement des cylindres ainsi que de la température de référence ; et
    faire varier la température de l'air dans le dispositif de mouillage, la température de l'agent de mouillage et la température de l'agent de refroidissement des cylindres en fonction du signal de commande de manière qu'il s'établisse un état sensiblement isotherme dans le dispositif de mouillage.
  7. Procédé selon la revendication 6,
       caractérisé    en ce que la température de référence est déterminée en fonction d'une valeur de température pouvant être prédéterminée et/ou de la température de l'air dans le dispositif de mouillage
EP98123035A 1997-12-18 1998-12-07 Dispositif et procédé destiné à combattre la production d'eau de condensation dans les machines à imprimer Expired - Lifetime EP0924075B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US08/993,999 US5894795A (en) 1997-12-18 1997-12-18 Apparatus and method for preventing condensation in machines processing a web of material
US993999 1997-12-18

Publications (2)

Publication Number Publication Date
EP0924075A1 EP0924075A1 (fr) 1999-06-23
EP0924075B1 true EP0924075B1 (fr) 2001-11-07

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EP98123035A Expired - Lifetime EP0924075B1 (fr) 1997-12-18 1998-12-07 Dispositif et procédé destiné à combattre la production d'eau de condensation dans les machines à imprimer

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US (1) US5894795A (fr)
EP (1) EP0924075B1 (fr)
DE (2) DE59802045D1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10162788A1 (de) 2001-12-20 2003-07-10 Koenig & Bauer Ag Verfahren und Feuchtwerk zur kontaktlosen Befeuchtung eines Zylinders oder einer Walze im Druckwerk einer Offsetdruckmaschine
DE10222294A1 (de) * 2002-05-18 2003-12-04 Koenig & Bauer Ag Feuchtwerk mit Feuchtmittelzufuhr- und Rücklaufeinrichtung
DE10354430A1 (de) 2003-11-21 2005-06-09 Goss International Montataire S.A. Feuchtkasten einer Offsetdruckmaschine
US9032874B2 (en) * 2012-03-21 2015-05-19 Xerox Corporation Dampening fluid deposition by condensation in a digital lithographic system

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE629700C (de) * 1934-01-18 1936-05-11 Interprint G M B H Vorrichtung zum Anfeuchten der nicht druckenden Stellen von Flachdruckplatten in Druckmaschinen
DE1611233A1 (de) * 1967-08-21 1970-12-10 Dipl Rer Pol Leo Keller Steuerung der Temperaturverhaeltnisse in Feucht- und Farbwerk von Offsetdruckmaschinen
DE1920679A1 (de) * 1969-04-21 1970-11-05 Leo Keller Einrichtung in Offsetdruckmaschinen zur Konstanthaltung,Steuerung,Regelung der Feuchtungstemperatur an deren Kontaktstelle mit der Druckform
JPS55135665A (en) * 1979-04-10 1980-10-22 Takeshi Hashimoto Dampening water cooling device in printing press
JPS5862053A (ja) * 1981-10-08 1983-04-13 株式会社　篠原鉄工所 オフセツト印刷機
DE4000912C1 (fr) * 1990-01-15 1991-05-29 Jagusch & Co, 8649 Wallenfels, De
DE4143232A1 (de) * 1991-12-31 1993-07-01 Wilfried Braeutigam Vorrichtung zum messen, steuern und konstanthaltung des mischungsverhaeltnisses einer fluessigkeitsmischung

Also Published As

Publication number Publication date
DE59802045D1 (de) 2001-12-13
US5894795A (en) 1999-04-20
EP0924075A1 (fr) 1999-06-23
DE19856370A1 (de) 1999-06-24

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