EP0854035B1 - Method for controlling the composition and viscosity of printing ink - Google Patents
Method for controlling the composition and viscosity of printing ink Download PDFInfo
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- EP0854035B1 EP0854035B1 EP98100410A EP98100410A EP0854035B1 EP 0854035 B1 EP0854035 B1 EP 0854035B1 EP 98100410 A EP98100410 A EP 98100410A EP 98100410 A EP98100410 A EP 98100410A EP 0854035 B1 EP0854035 B1 EP 0854035B1
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- Prior art keywords
- viscosity
- composition
- ink
- solvent
- measuring chamber
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F31/00—Inking arrangements or devices
- B41F31/005—Ink viscosity control means
Definitions
- the invention relates to a method for regulating the composition and the viscosity of ink circulating in a printing press.
- composition and viscosity of the printing ink must be printed on a suitable Value should be kept, otherwise the paint is applied too thin or too thick becomes. If a high quality print is to be obtained, the composition must and viscosity are regulated very precisely. Without special measures, changes the composition and the viscosity increases as solvent evaporates. On Another reason why the viscosity increases is that the color keeps coming back goes through the cycle, which also leads to a change in viscosity over time leads. The reason for this is not fully understood, but is probably due to the fact that the color pigments become electrostatically charged. Finally, the viscosity changes too with the temperature. It therefore requires a high level of skill or complex technical facilities, continuously monitor and regulate the composition and viscosity, so that the printed image does not deteriorate.
- the paint in the paint container is stirred with a motor, the torque to be applied by the motor as a measure of the viscosity is used.
- the corresponding torque absorption is e.g. from the height the surface of the liquid paint and other factors determined so that an accurate Viscosity control is not possible.
- the agitator that is used to stir the paint. This is very time-consuming.
- the object of the invention is to create a method of the aforementioned Kind that is reliable, delivers accurate values and easy machine cleaning enables.
- the initial desired viscosity can first be set in a conventional manner in which the specialist has his or her experience to achieve an optimal printing result can fully use. He can e.g. also make a test print to determine whether the viscosity has the right value or not. By this conventional Determining the viscosity will be a very accurate and reliable starting point for that Process created.
- the initial viscosity can be measured using a measuring cup or another known method can be set.
- the composition and the viscosity can also be entered previously by the method Value to be regulated automatically.
- the temperature in the measuring chamber and the speed of sound using ultrasound measured in color can have a smooth-walled tube, attached to the ultrasonic transmitter and receiver and the temperature sensor are so that it is easy to clean when changing colors or soiling. This can by passing solvent through it. Only in the case of incrustations the measuring chamber can be taken apart, but can then also be easily cleaned become.
- the speed of sound the chemical composition be determined. If here and in the following we speak of the speed of sound, then so it should be noted that this speed of sound is not measured directly and then is further evaluated, but the transit time of ultrasonic pulses through the color. This Runtime or the speed of sound changes with the chemical composition, whether a lot or little solvent is added. It will be ongoing for Temperature changes as well as changes in the speed of sound due to progressive Machine runtime corrections when determining the composition performed based on known parameter values.
- the determination described alternates the composition measured the viscosity. This happens because you let the color run out of the measuring chamber and thereby the flow rate determined with the help of an ultrasonic echo method in which the transit time of ultrasonic pulses is measured, which reflects from the surface of the color liquid in the measuring chamber.
- composition and viscosity are then added regulated by paint or solvent. This is a precise regulation of the Composition and viscosity and thus also pigment density and print quality possible.
- the method according to the invention enables viscosity and composition can be set and controlled separately, so that a previously unattainable print quality can be achieved.
- An advantageous embodiment is characterized in that according to a predetermined Cycle with the help of ultrasound measurements determined values for the composition be saved as a new setpoint.
- Another advantageous embodiment is characterized in that solvents is added discontinuously and then with the addition of solvent wait until the color of the composition before adding the solvent has reached.
- the composition and viscosity do not go through a continuous curve, but more or less a sawtooth curve, what has proven to be more favorable for the regulation. Especially when the setpoint set to what is absolutely necessary is during most of the cycle Printed with lower viscosity, which saves color in the long term can.
- a particularly simple embodiment is characterized in that for the measurement the composition and viscosity of the same ultrasonic transmitter / receiver be used.
- the switchover can take place automatically. If the color level in the measuring chamber drops from, so that ultrasound transmitter and ultrasound receiver no longer by an uninterrupted Color range are connected, so there is a switchover automatically Echo operation to measure and track the level of the liquid. This can both happen that the lower and the upper element of the ultrasonic measuring section can be switched as encoder / receiver.
- the strength of the feedback is expediently adjustable. That way the control behavior can be optimally adapted to the given conditions.
- the temperature coefficient is determined based on an empirical value for colors. Because of this Temperature coefficient can be different for different colors, can be provided be that the temperature coefficient is adjustable, depending on the color used is set accordingly. In this way, the optimal result for each color receive.
- the extent of the change in viscosity in the step of adding solvent be adjustable. In other words, you can set how much solvent each time is added or how strong the viscosity with this addition of solvent is lowered. The same applies to the addition of color.
- the actual value is obtained after each cycle the composition and viscosity selected and saved as a new setpoint.
- this new setpoint changes in temperature and changes in Speed of sound due to the machine running time already taken into account, so that the corresponding correction values are not stored in the computer as a long series of numbers Need to become. Rather, you always work with a current setpoint, and then the corrections due to temperature changes and machine runtime have already been carried out are. Practical tests have shown that these are proportionate short control cycles with readjustment of the setpoint much better and more precise Get results.
- the inventive method of measuring and controlling the composition and the viscosity can be done for multiple colors at the same time.
- the electronic control can be carried out by a suitable device so that the control all channels is possible with the help of a single control unit. Even the regulation is done by this one device for all channels together.
- Fig. 1 the schematic structure of a printing press is shown, which according to the invention Process works.
- the paint 2 is in a paint tray (paint container) 1, in which immerses a dipping roller 3 rotating in the direction of the arrow. This transmits the Color on the cliché cylinder 4 on which the cliché is arranged. With this cliché cylinder the continuous film 5 is printed, with an impression cylinder 6 ensures that the film 5 is sufficiently strong against the plate cylinder.
- the paint 2, which is located in the paint tray 1, is shown with the help of a Paint pump constantly renewed.
- a mixing container 7 and a measuring chamber 8 are arranged in the paint circuit, which are shown in FIG are shown.
- the paint passes through the tube 9 from the paint container 1 via an initially opened first valve 10 in the measuring chamber 8 and passes through it to then in to reach the mixing container 7. Excess paint, especially if the first Valve 10, as described below, is closed by an overflow pipe 11 in drain the mixing tank 7.
- a temperature sensor is located in the measuring chamber 8 12 and ultrasound transmitter / receiver 13. With the aid of the ultrasound transmitter / receiver 13 is the running time of ultrasonic pulses and thus the speed of sound in the color measured from which the composition can be determined, since the speed of sound is known to depend on the composition.
- the first valve 10 After a certain Time the first valve 10 is closed and a vent valve 14 is opened, so that the color can leak out of the measuring chamber 8.
- a vent valve 14 After a certain Time the first valve 10 is closed and a vent valve 14 is opened, so that the color can leak out of the measuring chamber 8.
- the outflow speed can then be determined from this and thus the viscosity can be determined. It will be useful At the outlet of the measuring chamber 8, a defined constriction, not shown in FIG. 2, is provided his.
- valves 17, 18 paint or dilution.
- the first valve 10, the vent valve 14, the valves 17 and 18 and the temperature sensor 12 and the ultrasonic transmitter / receiver 13 are what is not shown in the figure is, with suitable control devices, in particular a microprocessor or Computer connected so that the regulation can run accordingly.
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- Inking, Control Or Cleaning Of Printing Machines (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
Abstract
Description
Die Erfindung betrifft ein Verfahren zum Regeln der Zusammensetzung und der Viskosität von in einer Druckmaschine umlaufender Farbe.The invention relates to a method for regulating the composition and the viscosity of ink circulating in a printing press.
Die Zusammensetzung und Viskosität der Druckfarbe muß beim Drucken auf einem geeigneten Wert gehalten werden, da sonst die Farbe zu dünn oder zu dick aufgetragen wird. Wenn ein Druck hoher Qualität erhalten werden soll, so muß die Zusammensetzung und Viskosität sehr genau geregelt werden. Ohne besondere Maßnahmen verändert sich die Zusammensetzung und wächst die Viskosität an, da Lösungsmittel verdampft. Ein weiterer Grund, warum die Viskosität anwächst, besteht darin, daß die Farbe immer wieder den Kreislauf durchläuft, was im Laufe der Zeit ebenfalls zu einer Viskositätsänderung führt. Der Grund hierfür wird nicht vollständig verstanden, liegt aber vermutlich daran, daß sich die Farbpigmente elektrostatisch aufladen. Schließlich ändert sich die Viskosität auch mit der Temperatur. Es verlangt also hohes Fachkönnen oder aufwendige technische Einrichtungen, die Zusammensetzung und die Viskosität laufend zu überwachen und zu regeln, damit sich das Druckbild nicht verschlechtert.The composition and viscosity of the printing ink must be printed on a suitable Value should be kept, otherwise the paint is applied too thin or too thick becomes. If a high quality print is to be obtained, the composition must and viscosity are regulated very precisely. Without special measures, changes the composition and the viscosity increases as solvent evaporates. On Another reason why the viscosity increases is that the color keeps coming back goes through the cycle, which also leads to a change in viscosity over time leads. The reason for this is not fully understood, but is probably due to the fact that the color pigments become electrostatically charged. Finally, the viscosity changes too with the temperature. It therefore requires a high level of skill or complex technical facilities, continuously monitor and regulate the composition and viscosity, so that the printed image does not deteriorate.
Bei einem vorbekannten Verfahren wird die Farbe im Farbbehälter mit einem Motor umgerührt, wobei das vom Motor aufzubringende Drehmoment als Maß für die Viskosität verwendet wird. Die entsprechende Drehmomentaufnahme wird aber z.B. von der Höhe der Oberfläche der flüssigen Farbe und anderen Faktoren bestimmt, so daß eine genaue Viskositätsregelung nicht möglich ist. Außerdem muß, wenn die Farbe gewechselt werden soll, nicht nur der Farbbehälter, die Leitungen usw. gereinigt werden, sondern auch das Rührwerk, mit dem die Farbe umgerührt wird. Dies ist sehr aufwendig. In a previously known method, the paint in the paint container is stirred with a motor, the torque to be applied by the motor as a measure of the viscosity is used. The corresponding torque absorption is e.g. from the height the surface of the liquid paint and other factors determined so that an accurate Viscosity control is not possible. In addition, if the color needs to be changed should not only be cleaned the paint container, the lines, etc., but also the agitator that is used to stir the paint. This is very time-consuming.
Die Aufgabe der Erfindung besteht in der Schaffung eines Verfahrens der eingangs genannten Art, das zuverlässig ist, genaue Werte liefert und ein leichtes Reinigen der Maschine ermöglicht.The object of the invention is to create a method of the aforementioned Kind that is reliable, delivers accurate values and easy machine cleaning enables.
Die erfindungsgemäße Lösung besteht darin,
Es kann zunächst auf konventionelle Art die anfängliche gewünschte Viskosität eingestellt werden, bei der der Fachmann seine Erfahrungen zum Erzielen eines optimalen Druckergebnisses voll verwenden kann. Er kann z.B. auch einen Probedruck herstellen, um festzustellen, ob die Viskosität den richtigen Wert hat oder nicht. Durch dieses konventionelle Bestimmen der Viskosität wird ein sehr genauer und zuverlässiger Ausgangspunkt für das Verfahren geschaffen. Die anfängliche Viskosität kann dabei mit Hilfe eines Meßbechers oder eines anderen bekannten Verfahrens eingestellt werden. Die Zusammensetzung und die Viskosität können aber durch das Verfahren auch auf einen vorher eingegebenen Wert automatisch geregelt werden.The initial desired viscosity can first be set in a conventional manner in which the specialist has his or her experience to achieve an optimal printing result can fully use. He can e.g. also make a test print to determine whether the viscosity has the right value or not. By this conventional Determining the viscosity will be a very accurate and reliable starting point for that Process created. The initial viscosity can be measured using a measuring cup or another known method can be set. The composition and the viscosity can also be entered previously by the method Value to be regulated automatically.
Es wird in der Meßkammer die Temperatur und mit Hilfe von Ultraschall die Schallgeschwindigkeit in der Farbe gemessen. Die Meßkammer kann ein glattwandiges Rohr aufweisen, an dem Ultraschallgeber und -empfänger und der Temperatursensor angebracht sind, so daß dieses bei Farbwechsel oder Verschmutzung leicht zu reinigen ist. Dies kann durch Hindurchleiten von Lösungsmittel geschehen. Nur im Falle von Verkrustungen muß die Meßkammer auseinandergenommen werden, kann dann aber ebenfalls leicht gereinigt werden. Mit Hilfe der Schallgeschwindigkeit kann die chemische Zusammensetzung bestimmt werden. Wenn hier und im folgenden von Schallgeschwindigkeit die Rede ist, so sollte bemerkt werden, daß diese Schallgeschwindigkeit nicht direkt gemessen und dann weiter ausgewertet wird, sondern die Laufzeit von Ultraschallpulsen durch die Farbe. Diese Laufzeit bzw. die Schallgeschwindigkeit ändert sich mit der chemischen Zusammensetzung, ob also viel oder wenig Lösungsmittel zugegeben ist. Dabei werden laufend für Temperaturänderungen sowie Änderungen der Schallgeschwindigkeit aufgrund fortschreitender Maschinenlaufzeit Korrekturen bei der Bestimmung der Zusammensetzung aufgrund bekannter Parameterwerte durchgeführt.The temperature in the measuring chamber and the speed of sound using ultrasound measured in color. The measuring chamber can have a smooth-walled tube, attached to the ultrasonic transmitter and receiver and the temperature sensor are so that it is easy to clean when changing colors or soiling. This can by passing solvent through it. Only in the case of incrustations the measuring chamber can be taken apart, but can then also be easily cleaned become. With the help of the speed of sound, the chemical composition be determined. If here and in the following we speak of the speed of sound, then so it should be noted that this speed of sound is not measured directly and then is further evaluated, but the transit time of ultrasonic pulses through the color. This Runtime or the speed of sound changes with the chemical composition, whether a lot or little solvent is added. It will be ongoing for Temperature changes as well as changes in the speed of sound due to progressive Machine runtime corrections when determining the composition performed based on known parameter values.
Es wird also berücksichtigt, daß sich die Schallgeschwindigkeit mit der Temperatur ändert und sich die Schallgeschwindigkeit auch mit wachsender Laufzeit der Maschine, während der sich die Farbe in derselben befindet, verändert. Aufgrund dieser Korrektur bleibt die genaue Korrelation zwischen Schallgeschwindigkeit und Zusammensetzung erhalten, obwohl sich die Temperatur ändert und auch die Effekte aufgrund von Maschinenlaufzeit auftreten.It is therefore taken into account that the speed of sound changes with temperature and the speed of sound also with increasing machine runtime while which the color is in it changes. Due to this correction, the get exact correlation between speed of sound and composition, though the temperature changes and the effects due to machine runtime occur.
Bei einer vorteilhaften Ausführungsform wird abwechselnd mit der beschriebenen Bestimmung der Zusammensetzung die Viskosität gemessen. Dies geschieht dadurch, daß man die Farbe aus der Meßkammer auslaufen läßt und dabei die Auslaufgeschwindigkeit mit Hilfe eines Ultraschallechoverfahrens bestimmt, bei dem die Laufzeit von Ultraschallimpulsen gemessen wird, die von der Farbflüssigkeitsoberfläche in der Meßkammer reflektiert.In an advantageous embodiment, the determination described alternates the composition measured the viscosity. This happens because you let the color run out of the measuring chamber and thereby the flow rate determined with the help of an ultrasonic echo method in which the transit time of ultrasonic pulses is measured, which reflects from the surface of the color liquid in the measuring chamber.
Aufgrund dieser Messungen werden dann Zusammensetzung und Viskosität durch Zugabe von Farbe oder Lösungsmittel geregelt. Auf diese Weise ist eine genaue Regelung der Zusammensetzung und der Viskosität und damit auch der Pigmentdichte und der Druckqualität möglich. Das erfindungsgemäße Verfahren ermöglicht es dabei, daß Viskosität und Zusammensetzung getrennt eingestellt und geregelt werden können, so daß eine bisher nicht erreichbare Druckqualität erzielt werden kann. Based on these measurements, the composition and viscosity are then added regulated by paint or solvent. This is a precise regulation of the Composition and viscosity and thus also pigment density and print quality possible. The method according to the invention enables viscosity and composition can be set and controlled separately, so that a previously unattainable print quality can be achieved.
Eine vorteilhafte Ausführungsform zeichnet sich dadurch aus, daß die nach einem vorgegebenen Zyklus mit Hilfe von Ultraschallmessungen bestimmten Werte für die Zusammensetzung als neuer Sollwert eingespeichert werden.An advantageous embodiment is characterized in that according to a predetermined Cycle with the help of ultrasound measurements determined values for the composition be saved as a new setpoint.
Eine weitere vorteilhafte Ausführungsform zeichnet sich dadurch aus, daß Lösungsmittel diskontinuierlich zugegeben wird und anschließend solange mit der Zugabe von Lösungsmittel gewartet wird, bis die Farbe die Zusammensetzung vor Zugabe des Lösungsmittels erreicht hat. Die Zusammensetzung und die Viskosität durchlaufen also nicht eine kontinuierliche Kurve, sondern mehr oder weniger eine sägezahnförmige Kurve, was sich für die Regelung als günstiger erwiesen hat. Insbesondere dann, wenn der Sollwert auf das unbedingt Erforderliche eingestellt wird, wird während des größten Teils des Zyklus mit niedrigerer Viskosität gedruckt, wodurch langfristig Farbe eingespart werden kann.Another advantageous embodiment is characterized in that solvents is added discontinuously and then with the addition of solvent wait until the color of the composition before adding the solvent has reached. The composition and viscosity do not go through a continuous curve, but more or less a sawtooth curve, what has proven to be more favorable for the regulation. Especially when the setpoint set to what is absolutely necessary is during most of the cycle Printed with lower viscosity, which saves color in the long term can.
Eine besonders einfache Ausführungsform zeichnet sich dadurch aus, daß für die Messung der Zusammensetzung und der Viskosität dieselben Ultraschallsender/-empfänger verwendet werden.A particularly simple embodiment is characterized in that for the measurement the composition and viscosity of the same ultrasonic transmitter / receiver be used.
Die Umschaltung kann dabei automatisch erfolgen. Sinkt der Farbspiegel in der Meßkammer ab, so daß Ultraschallgeber und Ultraschallempfänger nicht mehr durch eine ununterbrochene Farbstrecke verbunden sind, so erfolgt automatisch eine Umschaltung auf Echobetrieb, um die Höhe des Flüssigkeitspegels zu messen und zu verfolgen. Dies kann sowohl dadurch geschehen, daß das untere als auch das obere Element der Ultraschallmeßstrecke als Geber/Empfänger geschaltet werden.The switchover can take place automatically. If the color level in the measuring chamber drops from, so that ultrasound transmitter and ultrasound receiver no longer by an uninterrupted Color range are connected, so there is a switchover automatically Echo operation to measure and track the level of the liquid. This can both happen that the lower and the upper element of the ultrasonic measuring section can be switched as encoder / receiver.
Dadurch, daß nicht nur die Zusammensetzung, sondern auch die Viskosität direkt gemessen wird, kann vermieden werden, daß sich nach einiger Zeit Fehler einschleichen, wenn zum Beispiel gewisse Parameter wie die Abhängigkeit der Viskosität von der Temperatur oder der Maschinenlaufzeit nicht genau bekannt sind.Because not only the composition, but also the viscosity is measured directly can be avoided that errors creep in after some time, if, for example, certain parameters such as the dependence of viscosity on temperature or the machine runtime is not exactly known.
Zweckmäßigerweise ist die Stärke der Rückkopplung einstellbar. Auf diese Weise kann das Regelverhalten optimal an die gegebenen Verhältnisse angepaßt werden. Der Temperaturkoeffizient wird aufgrund eines Erfahrungswertes für Farben bestimmt. Da dieser Temperaturkoeffizient für unterschiedliche Farben unterschiedlich sein kann, kann vorgesehen sein, daß der Temperaturkoeffizient einstellbar ist, also je nach verwendeter Farbe entsprechend eingestellt wird. Auf diese Weise wird für jede Farbe das optimale Ergebnis erhalten.The strength of the feedback is expediently adjustable. That way the control behavior can be optimally adapted to the given conditions. The temperature coefficient is determined based on an empirical value for colors. Because of this Temperature coefficient can be different for different colors, can be provided be that the temperature coefficient is adjustable, depending on the color used is set accordingly. In this way, the optimal result for each color receive.
Weiter kann das Ausmaß der Änderung der Viskosität beim Schritt des Zufügens von Lösungsmittel einstellbar sein. D.h., es kann eingestellt werden, wieviel Lösungsmittel jeweils zugegeben wird bzw. wie stark die Viskosität bei diesem Zugeben von Lösungsmittel erniedrigt wird. Analoges gilt für die Zugabe von Farbe.Furthermore, the extent of the change in viscosity in the step of adding solvent be adjustable. In other words, you can set how much solvent each time is added or how strong the viscosity with this addition of solvent is lowered. The same applies to the addition of color.
Bei einer besonders vorteilhaften Ausführungsform wird nach jedem Zyklus der Istwert der Zusammensetzung und der Viskosität als neuer Sollwert gewählt und eingespeichert. Bei diesem neuen Sollwert sind dann Änderungen der Temperatur sowie Änderungen der Schallgeschwindigkeit aufgrund der Maschinenlaufzeit bereits berücksichtigt, so daß die entsprechenden Korrekturwerte im Rechner nicht als eine lange Zahlenreihe gespeichert werden müssen. Man arbeitet vielmehr immer mit einem aktuellen Sollwert, wobei dann die Korrekturen wegen Temperaturänderungen und Maschinenlaufzeit bereits durchgeführt sind. Praktische Versuche haben ergeben, daß sich durch solche verhältnismäßig kurzen Regelzyklen mit Neueinstellung des Sollwertes wesentlich bessere und genauere Ergebnisse erhalten lassen.In a particularly advantageous embodiment, the actual value is obtained after each cycle the composition and viscosity selected and saved as a new setpoint. With this new setpoint, changes in temperature and changes in Speed of sound due to the machine running time already taken into account, so that the corresponding correction values are not stored in the computer as a long series of numbers Need to become. Rather, you always work with a current setpoint, and then the corrections due to temperature changes and machine runtime have already been carried out are. Practical tests have shown that these are proportionate short control cycles with readjustment of the setpoint much better and more precise Get results.
Wenn nach einer vorgegebenen Zeit nach Öffnen des Lösungsmittelventils keine Viskositätsänderung festgestellt wird, wird bei einer vorteilhaften Ausführungsform eine Alarmmeldung gegeben. Es liegt dann offenbar eine Störung vor, wobei eine Ursache sein kann, daß der Lösungsmittelvorrat erschöpft ist und daher die Viskosität nicht mehr erniedrigt werden kann.If there is no change in viscosity after a specified time after opening the solvent valve is determined, in an advantageous embodiment, an alarm message given. Then there is apparently a malfunction, which may be a cause can that the solvent supply is exhausted and therefore no longer lowers the viscosity can be.
Das erfindungsgemäße Verfahren der Messung und Regelung der Zusammensetzung und der Viskosität kann gleichzeitig für mehrere Farben durchgeführt werden. Es sind dann mehrere Kanäle in der Elektronik vorgesehen, wobei sich in der Meßeinheit in jedem Meßkanal eine Einsteckkarte befindet, auf der die benötigte Meßelektronik jeweils einzeln abgeschirmt vorhanden ist. Somit ist sichergestellt, daß sich die einzelnen Kanäle während der Messung nicht gegenseitig beeinflussen. Die elektronische Steuerung kann dabei durch ein geeignetes Gerät ohne weiteres so durchgeführt werden, daß die Steuerung aller Kanäle mit Hilfe eines einzigen Steuergerätes möglich ist. Auch die Regelung wird durch dieses eine Gerät für alle Kanäle gemeinsam vorgenommen.The inventive method of measuring and controlling the composition and the viscosity can be done for multiple colors at the same time. There are then several channels are provided in the electronics, each in the measuring unit Measuring channel is a plug-in card on which the required measuring electronics individually shielded is present. This ensures that the individual channels do not influence each other during the measurement. The electronic control can be carried out by a suitable device so that the control all channels is possible with the help of a single control unit. Even the regulation is done by this one device for all channels together.
Die Erfindung wird im folgenden anhand einer vorteilhaften Ausführungsform unter Bezugnahme auf die beigefügten Zeichnungen beispielsweise beschrieben. Es zeigen:
- Fig. 1
- den schematischen Aufbau einer Druckmaschine, bei der das erfindungsgemäße Verfahren angewendet wird; und
- Fig. 2
- Einzelheiten der Meßkammer.
- Fig. 1
- the schematic structure of a printing press, in which the inventive method is applied; and
- Fig. 2
- Details of the measuring chamber.
In Fig. 1 ist der schematische Aufbau einer Druckmaschine dargestellt, die nach dem erfindungsgemäßen
Verfahren arbeitet. Die Farbe 2 befindet sich in einer Farbwanne (Farbbehälter) 1, in
die eine sich in Richtung des Pfeils drehende Tauchwalze 3 eintaucht. Diese überträgt die
Farbe auf den Klischeezylinder 4, auf dem das Klischee angeordnet ist. Mit diesem Klischeezylinder
wird die durchlaufende Folie 5 bedruckt, wobei durch einen Gegendruckzylinder
6 sichergestellt wird, daß die Folie 5 genügend stark am Klischeezylinder anliegt.
Die Farbe 2, die sich in der Farbwanne 1 befindet, wird mit Hilfe einer nicht gezeigten
Farbpumpe laufend erneuert.In Fig. 1 the schematic structure of a printing press is shown, which according to the invention
Process works. The
Im Farbkreislauf ist ein Mischbehälter 7 und eine Meßkammer 8 angeordnet, die in Fig. 2
gezeigt sind. Die Farbe gelangt durch das Rohr 9 vom Farbbehälter 1 über ein zunächst
geöffnetes erstes Ventil 10 in die Meßkammer 8 und durchläuft diese, um anschließend in
den Mischbehälter 7 zu gelangen. Überschüssige Farbe, insbesondere wenn das erste
Ventil 10 wie weiter unten beschrieben geschlossen ist, kann durch ein Überlaufrohr 11 in
den Mischbehälter 7 abfließen. In der Meßkammer 8 befindet sich ein Temperatursensor
12 sowie Ultraschallgeber/-empfänger 13. Mit Hilfe der Ultraschallgeber/-empfänger 13
wird die Laufzeit von Ultraschallpulsen und damit die Schallgeschwindigkeit in der Farbe
gemessen, woraus die Zusammensetzung bestimmt werden kann, da die Schallgeschwindigkeit
bekanntlich von der Zusammensetzung abhängig ist. Nach einer gewissen
Zeit wird das erste Ventil 10 geschlossen und ein Entlüftungsventil 14 geöffnet, so daß
die Farbe aus der Meßkammer 8 auslaufen kann. Werden die beiden Ultraschallgeber/empfänger
13 nicht mehr durch eine kontinuierliche Farbsäule verbunden, so wird einer
dieser Geber/Empfänger ausgeschaltet, während der andere auf Echobetrieb weiterarbeitet,
um die Flüssigkeitsoberfläche zu verfolgen. Daraus kann dann die Ausströmgeschwindigkeit
und damit die Viskosität bestimmt werden. Zweckmäßigerweise wird dabei
am Auslauf der Meßkammer 8 eine in der Fig. 2 nicht gezeigte definierte Verengung vorgesehen
sein.A mixing container 7 and a measuring
Je nach festgestellter Änderung der Zusammensetzung und/oder der Viskosität wird dann
aus Vorratsbehältern 15, 16 über Ventile 17, 18 Farbe oder Verdünnung zugegeben. Das
erste Ventil 10, das Entlüftungsventil 14, die Ventile 17 und 18 sowie der Temperatursensor
12 sowie die Ultraschallgeber/-empfänger 13 sind, was in der Figur nicht dargestellt
ist, mit geeigneten Steuerungseinrichtungen, insbesondere einem Mikroprozessor oder
Computer verbunden, damit die Regelung entsprechend ablaufen kann.Depending on the change in composition and / or viscosity that is determined
from
Claims (13)
- A method of controlling the composition and viscosity of ink (2) circulating in a printing machine, characterised1) in that the machine is filled with the ink (2), in which it passes continuously through a circuit between a mixing vessel (7), pressure device and measuring chamber (8);2) in that in the measuring chamber (8) the temperature is measured and also, by means of ultrasound, the velocity of sound in the ink (2), and the composition of the ink (2) is determined therefrom, wherein for temperature variations and also variations in the velocity of sound on the basis of the progressive machine running time corrections are made in determining the composition, and3) in that the composition and the viscosity are controlled by adding solvents or ink (2).
- A method according to Claim 1, characterised in that alternately with step 2) the viscosity is measured by allowing the ink (2) to flow out of the measuring chamber (8) at a given outlet opening and the outflow velocity is measured with an ultrasonic sensor (13) which measures the transit time of ultrasonic pulses which are reflected from the ink liquid surface in the measuring chamber (8).
- A method according to Claim 1 or 2, characterised in that initially the viscosity is adjusted by means of a measuring jug or other known method.
- A method according to Claim 1 or 2, characterised in that the composition and viscosity are initially controlled automatically to a previously entered value.
- A method according to any one of Claims 1 to 4, characterised in that the values for the composition determined according to a predetermined cycle by means of ultrasonic measurements are stored as a new desired value.
- A method according to any one of Claims 1 to 5, characterised in that solvent is added discontinuously and, subsequently, the adding of solvent is delayed until the ink (2) has attained the composition prior to the addition of solvent.
- A method according to any one of Claims 1 to 6, characterised in that for measuring the composition and the viscosity the same ultrasonic transmitters/receivers (13) are used.
- A method according to any one of Claims 1 to 7, characterised in that the intensity of the feedback is adjustable.
- A method according to any one of Claims 1 to 8, characterised in that the temperature coefficient of the variation in velocity of sound is adjustable with temperature.
- A method according to any one of Claims 1 to 9, characterised in that the extent of the variation in viscosity during the step of adding solvent is adjustable.
- A method according to any one of Claims 1 to 10, characterised in that after each cycle the actual value of the composition and the viscosity is chosen as a new desired value.
- A method according to any one of Claims 1 to 11, characterised in that an alarm signal is generated when after a preset time after opening the solvent valve no change in viscosity is detected.
- A method according to any one of Claims 1 to 12, characterised in that the measurement and control of viscosity is carried out simultaneously for a plurality of inks (2).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19701573A DE19701573A1 (en) | 1997-01-17 | 1997-01-17 | Process for controlling the composition and viscosity of printing ink |
DE19701573 | 1997-01-17 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0854035A1 EP0854035A1 (en) | 1998-07-22 |
EP0854035B1 true EP0854035B1 (en) | 2000-07-12 |
Family
ID=7817680
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98100410A Expired - Lifetime EP0854035B1 (en) | 1997-01-17 | 1998-01-12 | Method for controlling the composition and viscosity of printing ink |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0854035B1 (en) |
AT (1) | ATE194550T1 (en) |
DE (2) | DE19701573A1 (en) |
ES (1) | ES2151752T3 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2009504388A (en) * | 2005-08-17 | 2009-02-05 | ナショナル スターチ アンド ケミカル カンパニー | Printing machine control system |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1145851A1 (en) * | 2000-04-11 | 2001-10-17 | De La Rue Giori S.A. | Method for continuously checking the production of security printing machines, application of said method and device for performing the method |
DE20105481U1 (en) * | 2001-03-29 | 2002-08-14 | Planatol Klebetechnik Gmbh | Ink supplier |
DE102004052925A1 (en) * | 2004-10-29 | 2006-05-04 | Tampoflex Gmbh | Color feeding system for printing machine, has diluent box with peristaltic pumps , which are synchronously operated, and valve operating controller in such a manner that color consistency remains constant in one of hoses |
AU2005242225A1 (en) * | 2005-01-05 | 2007-06-28 | Johnson & Johnson Vision Care, Inc. | Viscosity control and colorant circulation for printing lens molds |
ES2264643B1 (en) * | 2005-06-22 | 2007-10-01 | Comexi, S.A. | DIPOSITIVE AND PRINTING METHOD USING CURABLE ENERGY INKS FOR FLEXOGRAPHIC PRINTER. |
DE102009053087B4 (en) * | 2009-11-13 | 2012-09-20 | SÜDDEKOR GmbH | Method and apparatus for dye batch production, computer program product and use |
DE102011080365A1 (en) * | 2011-08-03 | 2013-02-07 | Endress + Hauser Flowtec Ag | Method for determining the flow by means of ultrasound |
CN104494305A (en) * | 2014-11-28 | 2015-04-08 | 无锡市晨阳彩印厂 | Printing ink box with cooling and heat insulating functions |
CN106671413B (en) * | 2017-03-07 | 2024-03-19 | 沧州交通学院 | External blender of multi-functional scalable FDM-3D printer |
CN110774781A (en) * | 2019-11-05 | 2020-02-11 | 南安建金工业设计有限公司 | Artificial intelligence printer |
JP7272282B2 (en) * | 2020-01-14 | 2023-05-12 | トヨタ自動車株式会社 | Method for producing electrode mixture paste and method for producing non-aqueous secondary battery |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3602309A1 (en) * | 1986-01-27 | 1987-07-30 | Schmidt Gebr Druckfarben | Device having an actual value display and an adjustable reference value display for viscosity for determining the dilutability of viscous preparations |
WO1991017050A1 (en) * | 1990-05-01 | 1991-11-14 | Celio Engineering Sa | Process for controlling the inking in rotogravure and flexographic printing |
DE4116989A1 (en) * | 1991-05-24 | 1992-11-26 | Klaes Paul Gmbh | Automatic ink supply for printing process esp. on carton - has recirculating feed with mixing reservoir and integral viscosity monitors |
-
1997
- 1997-01-17 DE DE19701573A patent/DE19701573A1/en not_active Withdrawn
-
1998
- 1998-01-12 ES ES98100410T patent/ES2151752T3/en not_active Expired - Lifetime
- 1998-01-12 AT AT98100410T patent/ATE194550T1/en not_active IP Right Cessation
- 1998-01-12 DE DE59800190T patent/DE59800190D1/en not_active Expired - Fee Related
- 1998-01-12 EP EP98100410A patent/EP0854035B1/en not_active Expired - Lifetime
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2009504388A (en) * | 2005-08-17 | 2009-02-05 | ナショナル スターチ アンド ケミカル カンパニー | Printing machine control system |
Also Published As
Publication number | Publication date |
---|---|
ATE194550T1 (en) | 2000-07-15 |
ES2151752T3 (en) | 2001-01-01 |
DE19701573A1 (en) | 1998-07-23 |
DE59800190D1 (en) | 2000-08-17 |
EP0854035A1 (en) | 1998-07-22 |
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