EP3552826B1 - Doctoring cup for use in indirect printing of a surface - Google Patents

Doctoring cup for use in indirect printing of a surface Download PDF

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Publication number
EP3552826B1
EP3552826B1 EP19166939.9A EP19166939A EP3552826B1 EP 3552826 B1 EP3552826 B1 EP 3552826B1 EP 19166939 A EP19166939 A EP 19166939A EP 3552826 B1 EP3552826 B1 EP 3552826B1
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EP
European Patent Office
Prior art keywords
ink
riser pipe
printing
doctoring cup
cup according
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EP19166939.9A
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German (de)
French (fr)
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EP3552826A1 (en
Inventor
Oliver Nitschke
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Tampoprint GmbH
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Tampoprint GmbH
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Publication of EP3552826A1 publication Critical patent/EP3552826A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F17/00—Printing apparatus or machines of special types or for particular purposes, not otherwise provided for
    • B41F17/001—Pad printing apparatus or machines
    • 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 an ink squeegee pot for use in indirect printing of a surface by means of a pad printing machine, with an ink container open on one side, which comprises a color space for receiving and storing printing ink to be applied to a cliché and at least one squeegee blade for scraping off excess printing ink from the cliché, and with a vent communicating with the color space.
  • an ink doctor pot is known from, for example DE 199 08 865 A1 and from DE 43, 16 294 A1 .
  • EP 1 681 159 A2 shows a continuously fillable by means of a pump Ink squeegee pot, which also has a ventilation opening.
  • the aforementioned ink doctor pots are used in a known manner for storing and supplying printing ink to a cliché and for doctoring the printing ink from the cliché, the term "pot" not implying that these must be cylindrical containers.
  • Printing ink is typically only poured into such a doctor blade cup shortly before the start of the printing process.
  • the printing ink is typically a one- or two-component ink that also contains a solvent which can make up a substantial proportion, for example 20%, of the printing ink and influences its viscosity.
  • a water-based printing ink is also viewed as a solvent in the sense of interest here.
  • the ink squeegee cup While the printing process is being carried out, the ink squeegee cup is naturally moved back and forth when the squeegee movement is carried out. This generates frictional heat, and an overpressure builds up inside the ink squeegee pot as a result of thermal expansion and, what is much more important, as a result of evaporation of the solvent. Therefore, in the case of the ink squeegee pots in question, a ventilation opening has since been formed in an upper area of the ink container to vent the solvent so that evaporated solvent can escape and no overpressure occurs inside the ink squeegee pot, which would hinder the process between the ink container and Can push cliché through.
  • the above invention is based on the object of countering the problems described above better than has been practiced since then.
  • the object is achieved based on an ink squeegee pot of the type mentioned in accordance with the invention in that a riser pipe is provided within the color space, the riser pipe dipping into the printing ink at one end when the ink squeegee cup is used as intended and is otherwise sealed from the color space in terms of flow and at the other end above one communicates with the vent opening in the ascending pipe.
  • the invention prevents this solvent from easily escaping from the ink container. Rather, it is prevented from escaping into the atmosphere.
  • an excessive increase in pressure within the paint container is prevented by the fact that the gas phase above the liquid surface displaces the liquid upwards in the riser pipe.
  • the amount of solvent removed from the printing ink in this way is, however, much smaller than in the case of the riser due to the much smaller surface area of the printing ink inside the riser pipe, i.e. the size of the phase boundary between the liquid and gas phase, so that the solvent loss is significantly reduced overall can.
  • the resulting reduction in solvent loss is all the more significant, the larger the diameter of the ink squeegee pot, since in this case, with the same internal cross-sectional area of the riser pipe, the ratio of the surface area of the ink column within the riser pipe, which is decisive for evaporation, to the surrounding surface of the printing ink within the ink container is even lower.
  • a paint doctor pot with a diameter of 90 mm 2 If, for example, a paint doctor pot with a diameter of 90 mm 2 is considered, its internal cross-sectional area is approximately 6400 mm 2 . If the riser pipe has an internal cross-sectional area of 50 mm 2 , then its area proportion is less than 1%. If the doctor head is enlarged further, the ratio is even lower. The paint surface responsible for the evaporation within the riser pipe thus sinks to a value of well below 1% compared to the surface in paint doctor pots known since then.
  • the present invention has the advantage, on the one hand, that no solvent has to be refilled into the ink doctor pot during a typical industrial time interval. It has been found that when using a Ink doctor pot of the usual dimensions, a service life of eight hours can easily be achieved. For this purpose, the applicant has carried out tests with a known ink squeegee cup and a squeegee cup designed according to the invention, otherwise of the same dimensions. In both cases, a printing ink with an initial viscosity of 1000 mPas was used. After an eight-hour printing process and squeegee operation in a pad printing machine without refilling the known ink squeegee pot with solvent, the viscosity of the remaining printing ink was determined.
  • a very significant further advantage of the ink doctor pot according to the invention consists, in addition to the reduction in solvent consumption and the associated odor nuisance, also in the saving of printing ink. Because of the reduction in solvent consumption, the amount of printing ink stored within the ink doctor pot can be reduced considerably. So it no longer has to be kept in reserve within the ink doctor pot in order to limit the percentage loss of solvent within the printing ink.
  • process reliability is also improved during the printing process.
  • the process is more stable, especially when the amount of paint decreases towards the end of the industrial time interval.
  • a higher long-term print quality is achieved, which can be realized consistently over the entire considered typical industrial time interval of eight hours, for example.
  • vent opening is formed or delimited by a line section or connection piece or a connecting sleeve sealed into the paint container or formed by the paint container itself, and that the riser pipe is connected to the line section or the connection nozzle or the connecting sleeve in a sealing manner but communicating with the vent opening is.
  • the line section is plugged onto the line section or connecting piece protruding inward into the paint container and is then preferably held there with a clamping fit.
  • vent opening is preferably provided with a pressure reservoir outside the color space, is fluidly connected. In this way, the same pressure can always be maintained above the phase boundary between the printing ink and the gas phase inside the riser pipe.
  • the ventilation opening is in flow connection with the atmospheric environment of the paint container. In this case, the ventilation opening opens into the area around the ink doctor pot, as before.
  • the riser pipe is arranged inside the ink container in such a way that its open end immersed in the printing ink is at least 1 mm, in particular at least 2 mm, in particular at least 3 mm, in particular at least 4 mm, in particular at least 5 mm, and preferably at most 10 mm , in particular at most 9 mm, in particular at most 8 mm, in particular at most 7 mm, and further in particular at most 6 mm from a contact plane of the ink doctor pot on the cliché.
  • a distance of approx. 4 to 6 mm, in particular approx. 5 mm, is considered to be particularly suitable and advantageous.
  • the riser has an internal cross-sectional area of at least 30 mm 2 , in particular of at least 40 mm 2 , in particular of at most 100 mm 2 , in particular of at most 80 mm 2 , in particular of at most 60 mm 2 , and preferably of 50 mm 2 .
  • a cross-sectional area of the riser is at most 5%, in particular at most 2%, in particular at most 1.5%, in particular at most 1.0% of the cross-sectional area of the remaining color space.
  • the riser pipe itself can be formed from a rigid material or from a semi-rigid material.
  • a semi-rigid material is understood to be one which can be deflected slightly back and forth due to the movement of the doctor blade due to its inertia.
  • the material can advantageously be a thermoplastic elastomer, for example with the trade name Mapren.
  • a material with a Shore A hardness of 40-90, in particular 50-80, is considered to be advantageous. The hardness can be determined according to ASTM D 2240 in particular.
  • vent opening limited by a connecting piece or nipple, opens outside the paint container and by a removable cap or by one between one Closed position and an open position adjustable closure element can be covered.
  • the Figures 1 to 3 show an ink doctor pot 2 for a pad printing machine.
  • the ink squeegee pot 2 comprises an ink container 4 which is open on one side and which is dome-shaped or dome-shaped in the example shown and in FIG Figure 3 is shown in attachment to an indicated cliché 6 of a pad printing machine, otherwise not shown.
  • the Ink squeegee pot 2 or its ink container 4 comprises, in the case shown as an example, a circular squeegee blade 8, which is arranged, for example, in a circumferential annular groove 10 facing the cliché.
  • an elastically flexible material 12 is embedded, for example, which in turn has, for example, an annular groove 14 into which the doctor blade 8 is inserted.
  • the doctor blade 8 defines a contact plane 16 of the ink doctor pot 2 against the cliché 6.
  • the ink container 4 delimits a color space 18 for receiving and storing printing ink to be applied to the cliché 6.
  • the paint container 4 further comprises a vent opening 22 which is delimited by the paint container 4 itself.
  • the paint container 4 comprises a line section or connection piece 24 which opens into an upper region of the color space 18 and outside the paint container 4.
  • a riser pipe 28 is pushed onto the line section or connecting piece 24 and held there in a clamped and sealing manner.
  • the riser 28 extends in the direction orthogonal to the contact plane 16 of the paint container 4 and ends a few millimeters away from the contact plane 16 freely.
  • the riser pipe 28 dips into the printing ink 20.
  • a gas phase 30 within the color space 18 above the liquid surface 31 of the printing ink 20 is therefore of the interior of the riser pipe 28 communicating with the vent opening 22. This means that during operation of the ink doctor pot 2 and the operating heat generated as a result, solvent evaporates from the printing ink 20 and this solvent cannot escape directly from the ink doctor pot 2 through the vent opening 22. Rather, only solvent can escape through the vent opening 22, which solvent evaporates from the much smaller surface of the printing ink 20 within the riser pipe 28. If the pressure within the gas phase 30 increases above the liquid surface 31 of the printing ink 20, this leads to an increase in the liquid level 32 within the riser pipe. Since solvent evaporation is possible from here, albeit to a much lesser extent, the riser pipe 28 nonetheless forms a type of pressure compensation device in the ink doctor pot.
  • the riser pipe 28 is preferably formed from a semi-rigid, slightly elastic material so that it can perform slight movements in the course of the doctor blade movement. This helps ensure that the liquid level 32 within the riser 28 remains permanently liquid for a typical industrial time interval.
  • the spacing d of a free end 34 of the riser pipe 28 from the contact plane 16 also contributes to this, whereby the flow of printing ink 20 can take place below the free end 34 and associated pressure waves can get into the riser pipe 28.
  • vent opening 22 opens out via the line section or connecting piece 24 to the outside of the ink doctor pot 2.
  • a cap (not shown) or an adjustable closure element can be provided there.
  • the inner cross-sectional area of the riser pipe 28 and thus also the area of the liquid level 32 of the printing ink 20 inside the riser pipe 28 is much smaller than the liquid surface 31 of the printing ink 20 outside the riser pipe 28, much less solvent is evaporated overall and removed from the printing ink 20 . In this way, the solvent content of the printing ink 20 remains much less influenced and more constant. As a result, no solvent needs to be refilled during a typical industrial time interval of eight hours, but the viscosity of the printing ink changes only to an extent that is not very relevant for printing.

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

Description

Die Erfindung betrifft einen Farbrakeltopf zur Verwendung beim indirekten Bedrucken einer Oberfläche mittels einer Tampondruckmaschine, mit einem einseitig offenen Farbbehälter, der einen Farbraum zur Aufnahme und Bevorratung von auf ein Klischee aufzubringender Druckfarbe und wenigstens eine Rakelschneide zum Abrakeln von überschüssiger Druckfarbe von dem Klischee umfasst, und mit einer mit dem Farbraum kommunizierenden Entlüftungsöffnung. Ein derartiger Farbrakeltopf ist beispielsweise bekannt aus DE 199 08 865 A1 und aus DE 43, 16 294 A1 . EP 1 681 159 A2 zeigt einen kontinuierlich mittels einer Pumpe befüllbaren Farbrakeltopf, der ebenfalls eine Entlüftungsöffnung aufweist.The invention relates to an ink squeegee pot for use in indirect printing of a surface by means of a pad printing machine, with an ink container open on one side, which comprises a color space for receiving and storing printing ink to be applied to a cliché and at least one squeegee blade for scraping off excess printing ink from the cliché, and with a vent communicating with the color space. Such an ink doctor pot is known from, for example DE 199 08 865 A1 and from DE 43, 16 294 A1 . EP 1 681 159 A2 shows a continuously fillable by means of a pump Ink squeegee pot, which also has a ventilation opening.

Bei geschlossenen Farbgebersystemen werden zur Bevorratung und Zuführung von Druckfarbe auf ein Klischee und für das Abrakeln der Druckfarbe von dem Klischee vorgenannte Farbrakeltöpfe in bekannter Weise verwendet, wobei der Begriff "Topf" nicht impliziert, dass es sich hierbei um zylindrische Behältnisse handeln muss. In einen solchen Rakeltopf wird typischerweise erst kurz vor Beginn des Druckvorgangs Druckfarbe eingefüllt. Bei der Druckfarbe handelt es sich typischerweise um eine Ein- oder Zweikomponentenfarbe, die zusätzlich noch ein Lösemittel enthält, welches einen wesentlichen Anteil, beispielsweise 20 %, der Druckfarbe ausmachen kann und deren Viskosität beeinflusst. Auch eine Wasserbasis einer Druckfarbe wird als Lösemittel im hier interessierenden Sinn angesehen.In closed inking systems, the aforementioned ink doctor pots are used in a known manner for storing and supplying printing ink to a cliché and for doctoring the printing ink from the cliché, the term "pot" not implying that these must be cylindrical containers. Printing ink is typically only poured into such a doctor blade cup shortly before the start of the printing process. The printing ink is typically a one- or two-component ink that also contains a solvent which can make up a substantial proportion, for example 20%, of the printing ink and influences its viscosity. A water-based printing ink is also viewed as a solvent in the sense of interest here.

Während der Ausführung des Druckvorgangs wird der Farbrakeltopf bei der Ausführung der Rakelbewegung naturgemäß hin- und herbewegt. Hierdurch wird Reibungswärme erzeugt, und im Inneren des Farbrakeltopfs baut sich ein Überdruck infolge der Wärmeausdehnung und, was viel wesentlicher ist, infolge der Verdampfung des Lösemittels auf. Daher wurde bei hier in Rede stehenden Farbrakeltöpfen seither zur Lösemittelentlüftung eine Entlüftungsöffnung in einem oberen Bereich des Farbbehälters ausgebildet, damit verdampftes Lösemittel entweichen kann und im Inneren des Farbrakeltopfs kein den Prozess behindernder Überdruck entsteht, der die Druckfarbe zwischen Farbbehälter und Klischee hindurchdrücken kann. Da das Verdampfen von Lösemittel in erheblicher Menge stattfindet, entspricht es der seitherigen Praxis, dass während eines typischen Industriezeitintervalls von beispielsweise acht Stunden Laufzeit einer Tampondruckmaschine mehrmals Lösemittel nachgefüllt wird, was typischerweise durch die Entlüftungsöffnung hindurch erfolgt. Dies ist erforderlich, da andernfalls infolge des Lösemittelverlustes die Viskosität der Druckfarbe zu stark ansteigen würde.While the printing process is being carried out, the ink squeegee cup is naturally moved back and forth when the squeegee movement is carried out. This generates frictional heat, and an overpressure builds up inside the ink squeegee pot as a result of thermal expansion and, what is much more important, as a result of evaporation of the solvent. Therefore, in the case of the ink squeegee pots in question, a ventilation opening has since been formed in an upper area of the ink container to vent the solvent so that evaporated solvent can escape and no overpressure occurs inside the ink squeegee pot, which would hinder the process between the ink container and Can push cliché through. Since the evaporation of solvent takes place in considerable quantities, it has been the practice since then that during a typical industrial time interval of, for example, eight hours of operation of a pad printing machine, solvent is refilled several times, which is typically done through the ventilation opening. This is necessary because otherwise the viscosity of the printing ink would increase too much as a result of the loss of solvent.

Um dem Problem des Anstiegs der Viskosität der Druckfarbe in anderer Weise oder zusätzlich entgegenzuwirken, wurde die für ein Industriezeitintervall typischerweise benötigte Farbmenge, die in den Farbrakeltopf eingegeben wird, erheblich überschritten. Es wurde also mit erheblich mehr Druckfarbe gearbeitet, als für das betrachtete Zeitintervall erforderlich ist, um eine Reduzierung des Lösemittelanteils bezogen auf die im Farbrakeltopf noch befindliche Farbmenge zu begrenzen, damit mit der Verdampfung des Lösemittels keine allzu hohe Viskositätszunahme verbunden ist. Nach Ende des Zeitintervalls musste der überschüssige Anteil an Druckfarbe dann verworfen werden, was in ökologischer und ökonomischer Hinsicht nachteilig ist.In order to counteract the problem of the increase in the viscosity of the printing ink in another way or in addition, the amount of ink which is typically required for an industrial time interval and which is introduced into the ink doctor pot has been significantly exceeded. Considerably more printing ink was used than is required for the time interval under consideration in order to limit a reduction in the proportion of solvent in relation to the amount of ink still in the ink squeegee pot, so that there is no excessive increase in viscosity associated with the evaporation of the solvent. After the end of the time interval, the excess portion of printing ink then had to be discarded, which is disadvantageous from an ecological and economic point of view.

Der vorstehenden Erfindung liegt die Aufgabe zugrunde, den vorausgehend geschilderten Problemen besser zu begegnen, als dies seither praktiziert wurde.The above invention is based on the object of countering the problems described above better than has been practiced since then.

Diese Aufgabe wird erfindungsgemäß durch die Merkmale des Anspruchs 1 gelöst.This object is achieved according to the invention by the features of claim 1.

Vorteilhafte Weiterbildungen der vorliegenden Erfindung sind Gegenstand der abhängigen Ansprüche.Advantageous developments of the present invention are the subject matter of the dependent claims.

Die Aufgabe wird ausgehend von einem Farbrakeltopf der eingangs genannten Art erfindungsgemäß dadurch gelöst, dass innerhalb des Farbraums ein Steigrohr vorgesehen ist, wobei das Steigrohr beim bestimmungsgemäßen Gebrauch des Farbrakeltopfs einenends in die Druckfarbe eintaucht und gegenüber dem Farbraum im übrigen strömungsmäßig abgedichtet ist und anderenends oberhalb eines sich im Steigrohr einstellenden Flüssigkeitsspiegels mit der Entlüftungsöffnung kommuniziert.The object is achieved based on an ink squeegee pot of the type mentioned in accordance with the invention in that a riser pipe is provided within the color space, the riser pipe dipping into the printing ink at one end when the ink squeegee cup is used as intended and is otherwise sealed from the color space in terms of flow and at the other end above one communicates with the vent opening in the ascending pipe.

Wenn bei einer erfindungsgemäßen Ausbildung des Farbrakeltopfs von der Oberfläche der darin befindlichen Druckfarbe infolge der Hin- und Herbewegung und des Wärmeanstiegs Lösemittel verdampft, so wird erfindungsgemäß verhindert, dass dieses Lösemittel ohne weiteres aus dem Farbbehälter entweicht. Es wird vielmehr an einem Entweichen in die Atmosphäre gehindert. Es wird dennoch ein zu starker Druckanstieg innerhalb des Farbbehälters dadurch verhindert, dass die Gasphase oberhalb der Flüssigkeitsoberfläche die Flüssigkeit im Steigrohr nach oben verdrängt. Außerdem findet dort, also innerhalb des Steigrohrs, ebenfalls eine Abdampfung von Lösemittel statt, welches über die Entlüftungsöffnung entweichen kann. Die Menge des auf diese Weise der Druckfarbe entzogenen Lösemittels ist jedoch aufgrund der viel geringeren Oberfläche der Druckfarbe innerhalb des Steigrohrs, also der Größe der Phasengrenze zwischen Flüssigkeits- und Gasphase, sehr viel geringer als solchenfalls des Steigrohrs, so dass der Lösemittelverlust insgesamt wesentlich verringert werden kann. Die erfindungsgemäß herbeigeführte Reduktion des Lösemittelverlusts ist umso signifikanter, je größer der Durchmesser der Farbrakeltopfs ist, da solchenfalls bei gleichbleibender Innenquerschnittsfläche des Steigrohrs das Verhältnis der für die Verdampfung maßgeblichen Oberfläche der Farbsäule innerhalb des Steigrohrs zur umgebenden Oberfläche der Druckfarbe innerhalb des Farbbehälters noch geringer ist.If, in an inventive design of the ink squeegee pot, solvent evaporates from the surface of the printing ink contained therein as a result of the back and forth movement and the increase in heat, the invention prevents this solvent from easily escaping from the ink container. Rather, it is prevented from escaping into the atmosphere. However, an excessive increase in pressure within the paint container is prevented by the fact that the gas phase above the liquid surface displaces the liquid upwards in the riser pipe. In addition, there, that is, inside the riser pipe, there is also evaporation of solvent, which can escape through the vent opening. The amount of solvent removed from the printing ink in this way is, however, much smaller than in the case of the riser due to the much smaller surface area of the printing ink inside the riser pipe, i.e. the size of the phase boundary between the liquid and gas phase, so that the solvent loss is significantly reduced overall can. According to the invention The resulting reduction in solvent loss is all the more significant, the larger the diameter of the ink squeegee pot, since in this case, with the same internal cross-sectional area of the riser pipe, the ratio of the surface area of the ink column within the riser pipe, which is decisive for evaporation, to the surrounding surface of the printing ink within the ink container is even lower.

Betrachtet man beispielsweise einen Farbrakeltopf mit 90 mm2 Durchmesser, so beträgt dessen Innenquerschnittsfläche ungefähr 6400 mm2. Wenn das Steigrohr eine Innenquerschnittsfläche von 50 mm2 aufweist, so ist deren Flächenanteil kleiner als 1%. Bei weiterer Vergrößerung des Rakeltopfs ist das Verhältnis noch geringer. Die für die Verdampfung verantwortliche Farboberfläche innerhalb des Steigrohrs sinkt damit auf einen Wert von deutlich unter 1%, verglichen mit der Fläche bei seither bekannten Farbrakeltöpfen.If, for example, a paint doctor pot with a diameter of 90 mm 2 is considered, its internal cross-sectional area is approximately 6400 mm 2 . If the riser pipe has an internal cross-sectional area of 50 mm 2 , then its area proportion is less than 1%. If the doctor head is enlarged further, the ratio is even lower. The paint surface responsible for the evaporation within the riser pipe thus sinks to a value of well below 1% compared to the surface in paint doctor pots known since then.

Dadurch, dass das außerhalb des Steigrohrs, also von der durch den Farbbehälter druckdicht umschlossenen Oberfläche der Druckfarbe abdampfendes Lösemittel nicht entweichen kann, steigt der Partialdruck des Lösemittels innerhalb des Gasraums des Farbbehälters, was eine weitergehende Verdunstung ebenfalls begrenzt.Because the solvent evaporating outside the riser pipe, i.e. from the pressure-tight surface of the printing ink enclosed by the ink tank, cannot escape, the partial pressure of the solvent increases within the gas space of the ink tank, which also limits further evaporation.

Die vorliegende Erfindung bringt einerseits den Vorteil, dass während eines typischen Industriezeitintervalls kein Lösemittel in den Farbrakeltopf nachgefüllt werden muss. Es wurde festgestellt, dass bei Verwendung eines Farbrakeltopfs üblicher Abmessung eine Standzeit von acht Stunden ohne weiteres realisiert werden kann. Die Anmelderin hat hierfür Versuche mit einem bekannten Farbrakeltopf und einem erfindungsgemäß ausgebildeten Rakeltopf im Übrigen gleicher Abmessung durchgeführt. Es wurde in beiden Fällen eine Druckfarbe mit einer Ausgangsviskosität von 1000 mPas benutzt. Nach einem achtstündigen Druckprozess und Rakelbetrieb in einer Tampondruckmaschine ohne Nachbefüllung des bekannten Farbrakeltopfs mit Lösemittel wurde die Viskosität der restlichen Druckfarbe bestimmt. Sie lag bei dem bekannten Farbrakeltopf bei 2100 mPas und bei dem erfindungsgemäßen Farbrakeltopf bei nur 1280 mPas. Die geringe Viskositätszunahme innerhalb des erfindungsgemäßen Farbrakeltopfs macht sich drucktechnisch aber nicht bemerkbar, so dass ohne weiteres innerhalb einer üblichen Industriestandzeit von acht Stunden ohne Nachbefüllung mit Lösemittel gearbeitet werden kann.The present invention has the advantage, on the one hand, that no solvent has to be refilled into the ink doctor pot during a typical industrial time interval. It has been found that when using a Ink doctor pot of the usual dimensions, a service life of eight hours can easily be achieved. For this purpose, the applicant has carried out tests with a known ink squeegee cup and a squeegee cup designed according to the invention, otherwise of the same dimensions. In both cases, a printing ink with an initial viscosity of 1000 mPas was used. After an eight-hour printing process and squeegee operation in a pad printing machine without refilling the known ink squeegee pot with solvent, the viscosity of the remaining printing ink was determined. It was 2100 mPas for the known ink squeegee cup and only 1280 mPas for the ink squeegee cup according to the invention. The slight increase in viscosity within the ink squeegee pot according to the invention is not noticeable in terms of printing technology, however, so that it is possible to work with solvent without further refilling within a customary industrial idle time of eight hours.

Ein ganz wesentlicher weiterer Vorteil des erfindungsgemäßen Farbrakeltopfs besteht neben der Reduzierung des Lösemittelverbrauchs und der damit einhergehenden Geruchsbelästigung auch in einer Einsparung von Druckfarbe. Aufgrund der Reduzierung des Lösemittelverbrauchs kann nämlich die Menge von innerhalb des Farbrakeltopfs bevorrateter Druckfarbe beträchtlich reduziert werden. Es muss also nicht mehr wesentlich mehr Druckfarbe innerhalb des Farbrakeltopfs vorgehalten werden, um den prozentualen Lösemittelverlust innerhalb der Druckfarbe zu begrenzen.A very significant further advantage of the ink doctor pot according to the invention consists, in addition to the reduction in solvent consumption and the associated odor nuisance, also in the saving of printing ink. Because of the reduction in solvent consumption, the amount of printing ink stored within the ink doctor pot can be reduced considerably. So it no longer has to be kept in reserve within the ink doctor pot in order to limit the percentage loss of solvent within the printing ink.

Aufgrund der deutlich reduzierten Viskositätsveränderung der Druckfarbe ist auch die Prozesssicherheit während des Druckvorgangs verbessert. Der Prozess ist stabiler, und zwar gerade bei geringer werdender Farbmenge gegen Ende des Industriezeitintervalls hin. Es wird eine höhere Langzeitdruckqualität erzielt, die gleichbleibend über das gesamte betrachtete typische Industriezeitintervall von beispielsweise acht Stunden realisiert werden kann.Due to the significantly reduced change in the viscosity of the printing ink, process reliability is also improved during the printing process. The process is more stable, especially when the amount of paint decreases towards the end of the industrial time interval. A higher long-term print quality is achieved, which can be realized consistently over the entire considered typical industrial time interval of eight hours, for example.

Es wäre denkbar, dass die Entlüftungsöffnung des Farbrakeltopfs durch das Steigrohr selbst begrenzt ist, indem das Steigrohr durch den Farbbehälter hindurchgeführt ist.It would be conceivable that the ventilation opening of the ink squeegee pot is delimited by the riser pipe itself, in that the riser pipe is passed through the ink container.

Es wäre ebenso denkbar, dass die Entlüftungsöffnung von einem in den Farbbehälter eingedichteten oder von dem Farbbehälter selbst gebildeten Leitungsabschnitt oder Anschlussstutzen oder einer Anschlussmuffe gebildet oder begrenzt ist und dass das Steigrohr mit dem Leitungsabschnitt oder dem Anschlussstutzen oder der Anschlussmuffe dichtend jedoch mit der Entlüftungsöffnung kommunizierend verbunden ist. Im einfachsten Fall wird der Leitungsabschnitt auf den nach innen in den Farbbehälter vorstehenden Leitungsabschnitt oder Anschlussstutzen aufgesteckt und ist dort dann vorzugsweise klemmschlüssig gehalten.It would also be conceivable that the vent opening is formed or delimited by a line section or connection piece or a connecting sleeve sealed into the paint container or formed by the paint container itself, and that the riser pipe is connected to the line section or the connection nozzle or the connecting sleeve in a sealing manner but communicating with the vent opening is. In the simplest case, the line section is plugged onto the line section or connecting piece protruding inward into the paint container and is then preferably held there with a clamping fit.

Es erweist sich weiter als vorteilhaft, wenn die Entlüftungsöffnung mit einem Druckreservoir, vorzugsweise außerhalb des Farbraums, strömungsverbunden ist. Auf diese Weise kann oberhalb der Phasengrenze zwischen der Druckfarbe und der Gasphase innerhalb des Steigrohrs stets derselbe Druck aufrechterhalten werden.
Hierfür erweist es sich am einfachsten und daher als vorteilhaft, wenn die Entlüftungsöffnung mit der atmosphärischen Umgebung des Farbbehälters strömungsverbunden ist. In diesem Fall mündet die Entlüftungsöffnung wie bisher in die Umgebung des Farbrakeltopfs.It also proves to be advantageous if the vent opening is preferably provided with a pressure reservoir outside the color space, is fluidly connected. In this way, the same pressure can always be maintained above the phase boundary between the printing ink and the gas phase inside the riser pipe.
For this it has proven to be the simplest and therefore advantageous if the ventilation opening is in flow connection with the atmospheric environment of the paint container. In this case, the ventilation opening opens into the area around the ink doctor pot, as before.

Weiter wird vorgeschlagen, dass das Steigrohr so innerhalb des Farbbehälters angeordnet ist, dass sein offenes in die Druckfarbe eintauchendes Ende wenigstens 1 mm, insbesondere wenigstens 2 mm insbesondere wenigstens 3 mm, insbesondere wenigstens 4 mm, insbesondere wenigstens 5 mm, und vorzugsweise höchstens 10 mm, insbesondere höchstens 9 mm, insbesondere höchstens 8 mm, insbesondere höchstens 7 mm, und weiter insbesondere höchstens 6 mm von einer Anlageebene des Farbrakeltopfs an das Klischee beabstandet ist. Ein Abstand von ca. 4 bis 6 mm, insbesondere von ca. 5 mm, wird als besonders geeignet und vorteilhaft angesehen. Dies liegt insbesondere darin begründet, dass dann beim Hin- und Herbewegen des Farbrakeltopfs im Zuge der Rakelbewegung die Druckfarbe innerhalb des Rakeltopfs an dem Steigrohr vorbei, aber auch unterhalb des Endes des Steigrohrs vorbei, fließen kann. Hierdurch werden Druckimpulse in das Steigrohr eingeleitet, wodurch ein Erstarren der Druckfarbe an der Oberfläche innerhalb des Steigrohrs, also an der Phasengrenze, sicher verhindert werden kann.It is further proposed that the riser pipe is arranged inside the ink container in such a way that its open end immersed in the printing ink is at least 1 mm, in particular at least 2 mm, in particular at least 3 mm, in particular at least 4 mm, in particular at least 5 mm, and preferably at most 10 mm , in particular at most 9 mm, in particular at most 8 mm, in particular at most 7 mm, and further in particular at most 6 mm from a contact plane of the ink doctor pot on the cliché. A distance of approx. 4 to 6 mm, in particular approx. 5 mm, is considered to be particularly suitable and advantageous. This is due, in particular, to the fact that when the ink squeegee pot is moved back and forth in the course of the squeegee movement, the printing ink can flow within the squeegee pot past the riser pipe, but also past the end of the riser pipe. As a result, pressure pulses are introduced into the riser pipe, causing the printing ink to solidify on the surface within the Riser pipe, i.e. at the phase boundary, can be safely prevented.

Auch im Hinblick hierauf erweist es sich als vorteilhaft, dass das Steigrohr eine Innenquerschnittsfläche von wenigstens 30 mm2, insbesondere von wenigstens 40 mm2, insbesondere von höchstens 100 mm2, insbesondere von höchstens 80 mm2, insbesondere von höchstens 60 mm2, und vorzugsweise von 50 mm2 aufweist.With regard to this, too, it proves to be advantageous that the riser has an internal cross-sectional area of at least 30 mm 2 , in particular of at least 40 mm 2 , in particular of at most 100 mm 2 , in particular of at most 80 mm 2 , in particular of at most 60 mm 2 , and preferably of 50 mm 2 .

Weiter erweist es sich als vorteilhaft, dass eine Querschnittsfläche des Steigrohrs höchstens 5 %, insbesondere höchstens 2 %, insbesondere höchstens 1,5 %, insbesondere höchstens 1,0 % der Querschnittsfläche des übrigen Farbraums beträgt. Das Steigrohr selbst kann aus einem starren Material oder aus einem halbstarren Material gebildet sein. In diesem Sinne wird unter einem halbstarren Material ein solches verstanden, welches infolge der Rakelbewegung aufgrund seiner Trägheit geringfügig hin und her ausgelenkt werden kann. Bei dem Material kann es sich in vorteilhafter Weise um ein thermoplastisches Elastomer, beispielsweise des Handelsnamens Mapren, handeln. Ein Material mit einer Shore A-Härte von 40 - 90, insbesondere von 50 - 80 wird als vorteilhaft angesehen. Die Härte kann insbesondere nach ASTM D 2240 bestimmt werden.It also proves to be advantageous that a cross-sectional area of the riser is at most 5%, in particular at most 2%, in particular at most 1.5%, in particular at most 1.0% of the cross-sectional area of the remaining color space. The riser pipe itself can be formed from a rigid material or from a semi-rigid material. In this sense, a semi-rigid material is understood to be one which can be deflected slightly back and forth due to the movement of the doctor blade due to its inertia. The material can advantageously be a thermoplastic elastomer, for example with the trade name Mapren. A material with a Shore A hardness of 40-90, in particular 50-80, is considered to be advantageous. The hardness can be determined according to ASTM D 2240 in particular.

Es kann sich weiter als vorteilhaft erweisen, wenn die Entlüftungsöffnung durch einen Stutzen oder Nippel begrenzt außerhalb des Farbbehälters mündet und von einer abnehmbaren Kappe oder von einem zwischen einer Schließstellung und einer Öffnungsstellung verstellbaren Verschlusselement abdeckbar ist.It can also prove to be advantageous if the vent opening, limited by a connecting piece or nipple, opens outside the paint container and by a removable cap or by one between one Closed position and an open position adjustable closure element can be covered.

Weitere Merkmale, Vorteile und Einzelheiten der Erfindung ergeben sich aus den beigefügten Patentansprüchen und der zeichnerischen Darstellung und nachfolgenden Beschreibung einer bevorzugten Ausführungsform des erfindungsgemäßen Farbrakeltopfs.Further features, advantages and details of the invention emerge from the attached claims and the drawing and the following description of a preferred embodiment of the ink doctor pot according to the invention.

In der Zeichnung zeigen:

Figur 1
eine perspektivische Ansicht einer bevorzugten Ausführungsform eines erfindungsgemäßen Farbrakeltopfs;
Figur 2
eine perspektivische Ansicht des Farbrakeltopfs nach Figur 1 entlang einer Längsmittelebene aufgeschnitten; und
Figur 3
eine Seitenschnittansicht des Farbrakeltopfs nach Figuren 1 und 2 mit angedeutetem Klischee und Druckfarbe.
In the drawing show:
Figure 1
a perspective view of a preferred embodiment of an ink doctor pot according to the invention;
Figure 2
a perspective view of the ink doctor pot according to Figure 1 cut open along a longitudinal center plane; and
Figure 3
a side sectional view of the ink squeegee pot according to Figures 1 and 2 with indicated cliché and printing color.

Die Figuren 1 bis 3 zeigen einen Farbrakeltopf 2 für eine Tampondruckmaschine. Der Farbrakeltopf 2 umfasst einen einseitig offenen Farbbehälter 4, der im beispielhaft dargestellten Fall dom- oder kuppelförmig ausgebildet ist und in Figur 3 in Anlage an ein angedeutetes Klischee 6 einer im Übrigen nicht dargestellten Tampondruckmaschine dargestellt ist. Der Farbrakeltopf 2 bzw. dessen Farbbehälter 4 umfasst im beispielhaft dargestellten Fall eine kreisringförmige Rakelschneide 8, die beispielhaft in einer dem Klischee zugewandten umlaufenden Ringnut 10 angeordnet ist. In diese Ringnut 10 ist beispielhaft ein elastisch nachgiebiges Material 12 eingelassen, welches wiederum beispielhaft eine Ringnut 14 aufweist, in die die Rakelschneide 8 eingesetzt ist. Die Rakelschneide 8 definiert eine Anlageebene 16 des Farbrakeltopfs 2 gegen das Klischee 6.The Figures 1 to 3 show an ink doctor pot 2 for a pad printing machine. The ink squeegee pot 2 comprises an ink container 4 which is open on one side and which is dome-shaped or dome-shaped in the example shown and in FIG Figure 3 is shown in attachment to an indicated cliché 6 of a pad printing machine, otherwise not shown. The Ink squeegee pot 2 or its ink container 4 comprises, in the case shown as an example, a circular squeegee blade 8, which is arranged, for example, in a circumferential annular groove 10 facing the cliché. In this annular groove 10, an elastically flexible material 12 is embedded, for example, which in turn has, for example, an annular groove 14 into which the doctor blade 8 is inserted. The doctor blade 8 defines a contact plane 16 of the ink doctor pot 2 against the cliché 6.

Der Farbbehälter 4 begrenzt einen Farbraum 18 zur Aufnahme und Bevorratung von auf das Klischee 6 aufzubringender Druckfarbe.
Der Farbbehälter 4 umfasst des Weiteren eine Entlüftungsöffnung 22, die von dem Farbbehälter 4 selbst begrenzt ist. Der Farbbehälter 4 umfasst hierzu einen Leitungsabschnitt oder Anschlussstutzen 24, der in einem oberen Bereich des Farbraums 18 sowie außerhalb des Farbbehälters 4 mündet. Im Inneren des Farbraums 18 ist ein Steigrohr 28 auf den Leitungsabschnitt oder Anschlussstutzen 24 aufgesteckt und dort klemmschlüssig und dichtend gehalten. Das Steigrohr 28 erstreckt sich in Richtung orthogonal zu der Anlageebene 16 des Farbbehälters 4 und endet wenige Millimeter von der Anlageebene 16 beabstandet frei aus. Beim bestimmungsgemäßen Betrieb des Farbrakeltopfs taucht das Steigrohr 28 also in die Druckfarbe 20 ein. Eine Gasphase 30 innerhalb des Farbraums 18 oberhalb der Flüssigkeitsoberfläche 31 der Druckfarbe 20 ist also von dem mit der Entlüftungsöffnung 22 kommunizierenden Inneren des Steigrohrs 28 abgetrennt. Dies bedeutet, dass im Betrieb des Farbrakeltopfs 2 und der infolgedessen erzeugten Betriebswärme Lösemittel von der Druckfarbe 20 verdampft und dieses Lösemittel nicht unmittelbar durch die Entlüftungsöffnung 22 aus dem Farbrakeltopf 2 entweichen kann. Durch die Entlüftungsöffnung 22 hindurch kann vielmehr nur Lösemittel entweichen, welches von der sehr viel kleineren Oberfläche der Druckfarbe 20 innerhalb des Steigrohrs 28 abdampft. Wenn der Druck innerhalb der Gasphase 30 oberhalb der Flüssigkeitsoberfläche 31 der Druckfarbe 20 ansteigt, so führt dies zu einem Anstieg des Flüssigkeitsspiegels 32 innerhalb des Steigrohrs. Da von hier aus ein Abdampfen von Lösemittel, wenn auch in sehr viel geringerem Maße, möglich ist, bildet das Steigrohr 28 dennoch eine Art Druckausgleichsvorrichtung bei dem Farbrakeltopf.The ink container 4 delimits a color space 18 for receiving and storing printing ink to be applied to the cliché 6.
The paint container 4 further comprises a vent opening 22 which is delimited by the paint container 4 itself. For this purpose, the paint container 4 comprises a line section or connection piece 24 which opens into an upper region of the color space 18 and outside the paint container 4. In the interior of the color space 18, a riser pipe 28 is pushed onto the line section or connecting piece 24 and held there in a clamped and sealing manner. The riser 28 extends in the direction orthogonal to the contact plane 16 of the paint container 4 and ends a few millimeters away from the contact plane 16 freely. When the ink doctor pot is operated as intended, the riser pipe 28 dips into the printing ink 20. A gas phase 30 within the color space 18 above the liquid surface 31 of the printing ink 20 is therefore of the interior of the riser pipe 28 communicating with the vent opening 22. This means that during operation of the ink doctor pot 2 and the operating heat generated as a result, solvent evaporates from the printing ink 20 and this solvent cannot escape directly from the ink doctor pot 2 through the vent opening 22. Rather, only solvent can escape through the vent opening 22, which solvent evaporates from the much smaller surface of the printing ink 20 within the riser pipe 28. If the pressure within the gas phase 30 increases above the liquid surface 31 of the printing ink 20, this leads to an increase in the liquid level 32 within the riser pipe. Since solvent evaporation is possible from here, albeit to a much lesser extent, the riser pipe 28 nonetheless forms a type of pressure compensation device in the ink doctor pot.

Das Steigrohr 28 ist vorzugsweise aus einem halbstarren, leicht elastischen Material gebildet, so dass es im Zuge der Rakelbewegung leichte Bewegungen ausführen kann. Dies trägt dazu bei, dass der Flüssigkeitsspiegel 32 innerhalb des Steigrohrs 28 dauerhaft während eines typischen Industriezeitintervalls flüssig bleibt. Hierzu trägt auch die Beabstandung d eines freien Endes 34 des Steigrohrs 28 von der Anlageebene 16 bei, wodurch das Hindurchfließen von Druckfarbe 20 unterhalb des freien Endes 34 stattfinden kann und hiermit einhergehende Druckwellen in das Steigrohr 28 gelangen können.The riser pipe 28 is preferably formed from a semi-rigid, slightly elastic material so that it can perform slight movements in the course of the doctor blade movement. This helps ensure that the liquid level 32 within the riser 28 remains permanently liquid for a typical industrial time interval. The spacing d of a free end 34 of the riser pipe 28 from the contact plane 16 also contributes to this, whereby the flow of printing ink 20 can take place below the free end 34 and associated pressure waves can get into the riser pipe 28.

Die Entlüftungsöffnung 22 mündet im beispielhaft dargestellten Fall über den Leitungsabschnitt oder Anschlussstutzen 24 nach außerhalb des Farbrakeltopfs 2. Dort kann eine nicht dargestellte Kappe oder ein stellbares Verschlusselement vorgesehen sein.In the case shown by way of example, the vent opening 22 opens out via the line section or connecting piece 24 to the outside of the ink doctor pot 2. A cap (not shown) or an adjustable closure element can be provided there.

Dadurch, dass die Innenquerschnittsfläche des Steigrohrs 28 und damit auch die Fläche des Flüssigkeitsspiegels 32 der Druckfarbe 20 innerhalb des Steigrohrs 28 sehr viel geringer ist als die Flüssigkeitsoberfläche 31 der Druckfarbe 20 außerhalb des Steigrohrs 28 wird insgesamt sehr viel weniger Lösemittel verdampft und der Druckfarbe 20 entzogen. Auf diese Weise bleibt der Lösemittelgehalt der Druckfarbe 20 sehr viel weniger beeinflusst und konstanter. Im Ergebnis braucht während eines typischen Industriezeitintervalls von acht Stunden kein Lösemittel nachgefüllt zu werden, sondern die Viskosität der Druckfarbe ändert sich nur in drucktechnisch nicht sehr relevantem Umfang.Because the inner cross-sectional area of the riser pipe 28 and thus also the area of the liquid level 32 of the printing ink 20 inside the riser pipe 28 is much smaller than the liquid surface 31 of the printing ink 20 outside the riser pipe 28, much less solvent is evaporated overall and removed from the printing ink 20 . In this way, the solvent content of the printing ink 20 remains much less influenced and more constant. As a result, no solvent needs to be refilled during a typical industrial time interval of eight hours, but the viscosity of the printing ink changes only to an extent that is not very relevant for printing.

Claims (12)

  1. Ink doctoring cup (2) for a pad printing machine for indirect printing on a surface, the ink doctoring cup comprising an ink container (4) that is open on one side and comprises an ink chamber (18) for receiving and storing printing ink (20) to be applied to a printing block (6) and at least one doctor blade (8) for doctoring off excess printing ink (20) from the printing block (6), and having a vent opening (22) that communicates with the ink chamber (18), characterized in that a riser pipe (28) is provided within the ink chamber (18), one end of the riser pipe (28) dipping into the printing ink (20) when the ink doctoring cup is used as intended and otherwise being sealed in terms of flow from the ink chamber (18), and the other end communicating with the vent opening (22) above a liquid level (32) that is established in the riser pipe (28).
  2. Ink doctoring cup according to claim 1, characterized in that the vent opening (22) is delimited by the riser pipe (28) itself, by the riser pipe extending through the ink container (4).
  3. Ink doctoring cup according to claim 1, characterized in that the vent opening (22) is formed or delimited by a line portion or connecting piece (24) or a connecting sleeve sealed into the ink container (4) or formed by the ink container (4) itself, and in that the riser pipe (28) is connected to the line portion or the connecting piece (24) or the connecting sleeve in a sealing manner but so as to communicate with the vent opening (22).
  4. Ink doctoring cup according to any of the preceding claims, characterized in that the vent opening (22) is in flow connection with a pressure reservoir, preferably outside the ink chamber (18).
  5. Ink doctoring cup according to claim 4, characterized in that the vent opening (22) is in flow connection with the atmospheric environment of the ink container (4).
  6. Ink doctoring cup according to one or more of the preceding claims, characterized in that the riser pipe (28) is arranged inside the ink container (4) in such a way that its open end (34) dipping into the printing ink (20) is at a distance of at least 1 mm, in particular at least 2 mm, in particular at least 3 mm, in particular at least 4 mm, in particular at least 5 mm, and preferably at most 10 mm, in particular at most 9 mm, in particular at most 8 mm, in particular at most 7 mm, and more particularly at most 6 mm, from a contact plane (16) of the ink doctoring cup (2) on the printing block (6).
  7. Ink doctoring cup according to one or more of the preceding claims, characterized in that the riser pipe (28) has an inner cross-sectional area of at least 30 mm2, in particular of at least 40 mm2, in particular of at most 100 mm2, in particular of at most 80 mm2, in particular of at most 60 mm2, and preferably of 50 mm2.
  8. Ink doctoring cup according to one or more of the preceding claims, characterized in that a cross-sectional area of the riser pipe (28) is at most 5%, in particular at most 2%, in particular at most 1.5%, in particular at most 1.0%, of the cross-sectional area of the remaining ink chamber.
  9. Ink doctoring cup according to one or more of the preceding claims, characterized in that the riser pipe (28) is formed of a rigid or a semi-rigid material.
  10. Ink doctoring cup according to one or more of the preceding claims, characterized in that the material of the riser pipe (28) is formed of a thermoplastic elastomer.
  11. Ink doctoring cup according to one or more of the preceding claims, characterized in that the material of the riser pipe (28) has a Shore A hardness of 40-90, in particular of 50-80.
  12. Ink doctoring cup according to one or more of the preceding claims, characterized in that the vent opening (22) leads outside the ink container (4) in a manner delimited by a connection piece or nipple, and can be covered by a removable cap or by a closure element that is adjustable between a closed position and an open position.
EP19166939.9A 2018-04-11 2019-04-03 Doctoring cup for use in indirect printing of a surface Active EP3552826B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102018108557.5A DE102018108557B3 (en) 2018-04-11 2018-04-11 Ink cartridge for use in the indirect printing of a surface

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EP3552826A1 EP3552826A1 (en) 2019-10-16
EP3552826B1 true EP3552826B1 (en) 2020-11-11

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EP19166939.9A Active EP3552826B1 (en) 2018-04-11 2019-04-03 Doctoring cup for use in indirect printing of a surface

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EP (1) EP3552826B1 (en)
DE (1) DE102018108557B3 (en)

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CN112959814B (en) * 2021-02-20 2022-06-14 江西远大保险设备实业集团有限公司 Manufacturing device of transverse moving target

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Publication number Priority date Publication date Assignee Title
DE4316294B4 (en) 1992-05-15 2005-12-15 Teca-Print Ag Paint container for coloring a cliché of a pad printing machine
DE19908865A1 (en) * 1999-03-01 2000-09-07 Itw Morlock Gmbh Ink pot for pad printing press, including bottom closing cap for temporarily closing lower end of pot
AU2005242225A1 (en) * 2005-01-05 2007-06-28 Johnson & Johnson Vision Care, Inc. Viscosity control and colorant circulation for printing lens molds

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