EP0634271B1 - Méthode et dispositif pour régler la température d'une encre dans l'unité d'encrage d'une machine d'imprimerie - Google Patents

Méthode et dispositif pour régler la température d'une encre dans l'unité d'encrage d'une machine d'imprimerie Download PDF

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Publication number
EP0634271B1
EP0634271B1 EP94110269A EP94110269A EP0634271B1 EP 0634271 B1 EP0634271 B1 EP 0634271B1 EP 94110269 A EP94110269 A EP 94110269A EP 94110269 A EP94110269 A EP 94110269A EP 0634271 B1 EP0634271 B1 EP 0634271B1
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EP
European Patent Office
Prior art keywords
duct
ink
temperature
roller
duct roller
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
EP94110269A
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German (de)
English (en)
Other versions
EP0634271A1 (fr
Inventor
Hans-Joachim Kurz
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.)
Baldwin Grafotec GmbH
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Baldwin Grafotec GmbH
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Filing date
Publication date
Application filed by Baldwin Grafotec GmbH filed Critical Baldwin Grafotec GmbH
Publication of EP0634271A1 publication Critical patent/EP0634271A1/fr
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Classifications

    • 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
    • B41F31/00—Inking arrangements or devices
    • B41F31/02—Ducts, containers, supply or metering devices
    • B41F31/03—Ink agitators

Definitions

  • the invention relates to a method and a device according to the claims.
  • the known device contains a stirring element, which can be immersed in the inking unit of a printing press and contains an electrical heating wire for heating the ink in the ink fountain. Furthermore, it is known from DE-C-722 236 to give the ink fountain a small cross-sectional size.
  • Printing ink manufacturers offer printing inks with different rheological properties that are adapted to the respective printing task.
  • a printing ink is selected that is matched to the printing material with regard to viscosity and speed.
  • the printing companies are therefore forced to keep appropriately coordinated ink series in stock, especially with regard to warehousing is complex and expensive.
  • the rheological properties are also influenced by the respective color temperature. Studies have shown that with all printing inks there is always a clear linear relationship between the logarithm of the plastic viscosity or the tack values on the one hand and the reciprocal of the absolute temperature on the other hand (K.-H. Schirmer, S. Yoshijima: "Rheological properties of printing inks different temperature ", Kunststoff 1973).
  • a specific, predetermined starting temperature of the ink is important, for example, for the correct, repeatably accurate metering of the ink in the area of the ductor roller serving as the metering roller.
  • the printer generally solves this problem by placing the ink in the printing room for a long time before it is used, so that it takes on the temperature of this printing room.
  • the metering devices i.e. for example, the ink wipers of the duct roller set.
  • the inertia of the inking unit is the time that passes until an adjustment step that has been made arrives at the print carrier (this time is also very much dependent on the area coverage of the print subject).
  • the time between the execution of an adjustment process and the effect on the printed image is up to 90 seconds; with a realistic printing performance of about 10,000 sheets / hour, this time corresponds to about 250 sheets that are rejected.
  • the time for the control step equalized in tone value and area is approximately 13 seconds, which corresponds to a reject of approximately 180 copies.
  • the time in which an adjustment process, for example carried out via the ink fountain keys, has an effect on the printed image is already considerably shorter today.
  • it is only about 2 1/4 seconds, which corresponds to about 7 sheets.
  • the adjustment time is only about 0.5 seconds, which also corresponds to about 7 sheets.
  • the known linear relationship between the rheological properties of certain printing inks and their temperature makes it possible to determine the rheological properties of printing inks over a wide range if at least two points on the curve are known, for example by measurement.
  • the regulation or control of the color temperature therefore enables the rheological properties of the printing ink to be influenced in a targeted manner.
  • the method according to the invention consists in tempering the smallest possible ink supply immediately before it is taken up by the duct roller by means of separate temperature control devices. It has been shown that it is always possible to temper the ink in the inlet wedge of the ink fountain with an extremely short response time so that it has the desired temperature in the area of the print, for example. In this way, regardless of the inertia of the inking unit against temperature changes, the time required for a color temperature adjustment step to be carried out completely can be shortened considerably.
  • the method according to the invention not only allows the color temperature to be kept constant, as is mainly sought by the previously known methods and devices, but also to consciously control the temperature and thus the rheological properties of the color. This makes it possible to significantly reduce the previously required stock of colors of different rheological properties, since these rheological properties can now be set in a targeted manner via the color temperature control. In this way, inventory costs can be significantly reduced.
  • the color is tempered in a separate temperature control container arranged upstream of the ink fountain and is fed from this to the inlet wedge.
  • This solution enables the temperature control container to optimally adapt to the task assigned to it and to provide it with the necessary heating and cooling devices.
  • the temperature control container contains such a small amount of paint that it can be adjusted to the desired temperature in the shortest possible time.
  • the color in the inlet wedge of the ink fountain is tempered by temperature control elements.
  • a separate temperature control container can be omitted, so that the device for carrying out this method can be structurally simple.
  • the temperature control devices are preferably controlled by a closed control loop as a function of color and / or print image properties detected by suitable sensors;
  • Color properties include, for example, the surface temperatures or voltages of the color which can be detected by suitable sensors known per se, while the print image properties are given above all by the color density which can be determined by means of a densitometer.
  • a basic temperature control to an average temperature is carried out by tempering the ductor roller and / or the inking unit, while by means of the temperature control devices according to the invention only a final temperature control superimposed on the basic temperature control is brought to the desired final temperature. This measure serves to keep the performance of the temperature control devices according to the invention low.
  • the devices shown in FIGS. 1 and 2 comprise a duct roller 2, to which an ink fountain 4 is assigned in a manner known per se.
  • the ink fountain 4 essentially comprises two side walls (of which only the side wall 6 facing the viewer is visible) and a floor (not shown in more detail). The side walls are sealed off from the end faces of the duct roller 2.
  • the ink fountain 4 is divided by a partition 10 parallel to the duct roller axis 8 into a region 12 remote from the duct and a region 12 close to the duct, forming the inlet wedge 13. In this way, only an ink supply sufficient for a few duct circulations is maintained in the inlet wedge 13, the temperature of which can be quickly adapted to the respectively required temperature.
  • the bottom of the area 12 close to the doctor is formed in a manner known per se by a wiping device 14 which can be adjusted more or less close to the roller 2.
  • a wiping device 14 Any component that is capable of dosing the ink application on the duct roller in a suitable manner can serve as the wiping device.
  • the wiping device 14 is preferably formed by a plurality of tongues 14 ′ which are arranged next to one another without gaps and which can each be adjusted relative to the surface of the duct roller 2 by a suitable assigned mechanical, hydraulic, pneumatic or electrical feed device.
  • the delivery devices are formed by, for example, manually operable ink zone screws 16.
  • a tempering tank 18 is arranged above the roller 2, which contains a relatively small ink supply.
  • the temperature control tank 18 is equipped with schematically illustrated heating and / or cooling devices 20, by means of which the color supply present in the temperature control tank 18 can be quickly adjusted to the desired temperature.
  • the temperature control container 18 is connected to an ink guide tube 22 which is arranged above the inking roller 2 and which applies the tempered ink to the inking roller via a series of drip nozzles 24 directed directly onto the inking roller 2.
  • the total ink supply contained in the temperature control tank 18 on the one hand and on the duct roller 2 or in the inlet wedge 12 is so small that it is always only sufficient for a few duct circulations, so that a change in color temperature in the temperature box 18 very quickly affects the color temperature in the inlet wedge. In this way, the inertia related to the color temperature, i.e. the time between an adjustment step made and the effect in the printing area is extremely short.
  • FIG. 3 again shows a duct roller 32 and an ink fountain 34 assigned to it, which forms an ink wedge 36 with the duct roller 32.
  • the ink supply in the inlet wedge 36 is kept so small that it is only ever sufficient for a few duct circulations.
  • a color stirring device 38 is assigned to the ink fountain 34.
  • this consists of a conical stirring element 42 which can be rotated about an axis 40 and which can be moved parallel to the axis of rotation 44 of the duct roller 32 along the ink fountain 34.
  • the color element 42 is equipped with a heating and / or cooling device 46.
  • This device makes it possible to quickly set the ink supply in the ink fountain 34 to a desired temperature.
  • the heating and / or cooling device 46 is connected to a control device 48 which detects certain color properties and / or certain print image properties via sensors 50. Toughness or temperature are suitable as color properties; the color density on the printed image is particularly suitable as print image properties. In this way, a closed control loop is created, by means of which the color temperature in the run-in wedge 36 is always adjusted to a value which ensures compliance with the color and / or print image properties specified as target values.
  • the control device can be part of a higher-level machine control system, through which, among other things, the ink feed to the ink fountain and, if necessary, also the delivery of stripping elements 52 which can be set against the inking roller 32 by means of ink zone screws 54 are controlled.
  • the method according to the invention and the device according to the invention not only make it possible to keep the color temperature at an optimum value during a long-lasting printing process, even under changing environmental conditions; Rather, they also enable the color temperature to be quickly and specifically adapted to special requirements, for example to different qualities of the printing material.
  • the temperature control can be superimposed on the basic temperature control by means 20 or 46, which is carried out, for example, by temperature control of one or more rollers of the inking unit or one or more cylinders.

Landscapes

  • Inking, Control Or Cleaning Of Printing Machines (AREA)

Claims (10)

  1. Procédé de réglage de la température d'une encre d'imprimerie dans le mécanisme d'encrage d'une machine à imprimer, dans lequel l'encre est prélevée, par un cylindre encreur (2 ; 32), dans un encrier (4 ; 34) adjacent à celui-ci, et est transférée dans le mécanisme d'encrage, et dans lequel l'encre présente dans l'encrier (4 ; 34) est tempérée par des dispositifs d'équilibrage de la température (20 ; 42, 46), un rétrécissement conique d'encrage (13 ; 36) étant formé entre l'encrier (4 ; 34) et la partie du cylindre encreur (2 ; 32) qui y trempe, caractérisé en ce que seul un stock d'encre suffisant pour moins de dix rotations du cylindre encreur (2 ; 32) est toujours conservé dans le rétrécissement conique (13 ; 36).
  2. Procédé selon la revendication 1, caractérisé en ce que l'encre est tempérée dans un récipient d'équilibrage de la température (18) séparé, placé en amont de l'encrier (4 ; 34) et, à partir de celui-ci, est entrainée vers le rétrécissement conique (13 ; 36).
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce que les dispositifs d'équilibrage de la température (20 ; 42, 46) sont régulés par une boucle de régulation fermée, en fonction de caractéristiques de l'encre et/ou de l'image d'impression captées par des capteurs (50) adaptés.
  4. Procédé selon l'une des revendications 1 à 3, caractérisé en ce qu'est réalisé un équilibrage de base de la température, par équilibrage de la température du cylindre encreur (2 ; 32) et/ou du mécanisme d'encrage, et l'équilibrage final à la température souhaitée, au moyen du dispositif d'équilibrage de la température (20 ; 42, 46).
  5. Dispositif de réglage de la température d'une encre d'imprimerie dans le mécanisme d'encrage d'une machine à imprimer, comprenant une unité formant rouleau encreur, équipée d'un cylindre encreur (2 ; 32), un encrier (4 ; 34) adjacent au cylindre encreur et des dispositifs d'équilibrage de la température (20 ; 42, 46) équilibrant la température de l'encre se trouvant dans l'encrier (4 ; 34), un rétrécissement conique d'encrage (13 ; 36) étant formé entre l'encrier (4 ; 34) et la partie du cylindre encreur (2 ; 32) qui y trempe, caractérisé en ce que le rétrécissement conique (13 ; 36) ne contient toujours qu'une quantité d'encre suffisante pour moins de dix rotations du cylindre encreur (2 ; 32).
  6. Dispositif selon la revendication 5, caractérisé en ce qu'est prévu, pour entrainer l'encre vers l'encrier (4 ; 34), un tube de guidage de l'encre (22), placé avant l'encrier (4 ; 34), dans le sens de rotation du cylindre encreur (2 ; 32), orienté approximativement parallèlement à l'axe du cylindre encreur (8), sur lequel sont disposés un ou plusieurs tubes d'égouttage (24), répartis régulièrement sur la longueur du tube, orientés en direction du cylindre encreur (2 ; 32).
  7. Dispositif selon la revendication 5 ou 6, caractérisé en ce que l'encrier (4 ; 34) est séparé par une paroi de séparation (10), parallèle au cylindre encreur (2 ; 32), en une zone éloignée du cylindre et en une zone (12) proche du cylindre, qui constitue le rétrécissement conique (13 ; 36).
  8. Dispositif selon l'une des revendications 5 à 7, caractérisé en ce qu'est prévu un dispositif de régulation pourvu de capteurs (50) destinés à capter les caractéristiques de l'encre et/ou de l'image d'impression et pourvu de moyens (48) permettant de commander la température des dispositifs d'équilibrage de la température (20 ; 42, 46).
  9. Dispositif selon la revendication 8, caractérisé en ce que le dispositif de régulation fait partie d'une commande (48) de la machine, au moyen de laquelle il est également possible de commander l'arrivée d'encre dans l'encrier (4 ; 34).
  10. Dispositif selon la revendication 9, caractérisé en ce que sont prévues des racles (52) pouvant être appuyées contre le cylindre encreur (32), et en ce que l'appui des racles (52) peut être commandé par la commande (48) de la machine.
EP94110269A 1993-07-16 1994-07-01 Méthode et dispositif pour régler la température d'une encre dans l'unité d'encrage d'une machine d'imprimerie Expired - Lifetime EP0634271B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4323933A DE4323933A1 (de) 1993-07-16 1993-07-16 Verfahren und Einrichtung zum Einstellen der Temperatur einer Druckfarbe im Farbwerk einer Druckmaschine
DE4323933 1993-07-16

Publications (2)

Publication Number Publication Date
EP0634271A1 EP0634271A1 (fr) 1995-01-18
EP0634271B1 true EP0634271B1 (fr) 1997-09-17

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP94110269A Expired - Lifetime EP0634271B1 (fr) 1993-07-16 1994-07-01 Méthode et dispositif pour régler la température d'une encre dans l'unité d'encrage d'une machine d'imprimerie

Country Status (3)

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EP (1) EP0634271B1 (fr)
JP (1) JP3438148B2 (fr)
DE (2) DE4323933A1 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19623348B4 (de) * 1996-06-12 2007-03-01 Baldwin Germany Gmbh Flüssigkeits-Übertragungsvorrichtung der graphischen Industrie
DE19623349A1 (de) * 1996-06-12 1997-12-18 Baldwin Gegenheimer Gmbh Temperierte Flüssigkeits-Übertragungsvorrichtung der graphischen Industrie
DE19859436B4 (de) * 1998-12-22 2009-12-24 Heidelberger Druckmaschinen Ag Digitale Farbdosierung
DE102007051434B4 (de) * 2007-10-25 2010-11-11 Kba-Metronic Aktiengesellschaft Vorrichtung und Verfahren für Farbverlaufsdrucke
CN103395285B (zh) * 2013-08-07 2015-03-04 浏阳市慧丰印刷科技有限公司 胶印机墨斗加热装置
CN105034588B (zh) * 2015-08-31 2017-05-03 南通市乐悦实业有限公司 防结皮的印刷机墨斗装置
CN105034589B (zh) * 2015-08-31 2017-06-27 湖州佳宁印刷有限公司 便于调节的印刷机墨斗装置
CN107571622B (zh) * 2017-10-20 2023-07-07 杭州科雷智能印刷科技有限责任公司 一种可切换供墨机构的结构

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE722236C (de) * 1939-05-31 1942-07-04 Maschf Augsburg Nuernberg Ag Verfahren und Vorrichtung zum Trocknen von Tiefdruckpapierbahnen
US2234754A (en) * 1939-11-25 1941-03-11 Gegenheimer William Ink fountain mixer and agitator
DE1675538U (de) * 1954-02-04 1954-04-29 Schnellpressenfabrik Ag Heinzeinrichtung fuer farbkaesten an druckmaschinen.
JPS61163859A (ja) * 1985-01-16 1986-07-24 Mitsubishi Heavy Ind Ltd 印刷機のインキ膜厚制御装置
US5036762A (en) * 1990-06-12 1991-08-06 Sarda Jean Lucien Apparatus for supplying offset printing presses with a cooled damping solution
DE4108883A1 (de) * 1991-03-19 1992-09-24 Sengewald Karl H Gmbh Druckvorrichtung
JP2882922B2 (ja) * 1991-10-14 1999-04-19 三菱重工業株式会社 インキ供給装置

Also Published As

Publication number Publication date
DE4323933A1 (de) 1995-01-19
JPH07144404A (ja) 1995-06-06
JP3438148B2 (ja) 2003-08-18
DE59404075D1 (de) 1997-10-23
EP0634271A1 (fr) 1995-01-18

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