EP3756890B1 - Procédé et dispositif de mesure de la viscosité de l'encre lors de la tampographie - Google Patents

Procédé et dispositif de mesure de la viscosité de l'encre lors de la tampographie Download PDF

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Publication number
EP3756890B1
EP3756890B1 EP19183377.1A EP19183377A EP3756890B1 EP 3756890 B1 EP3756890 B1 EP 3756890B1 EP 19183377 A EP19183377 A EP 19183377A EP 3756890 B1 EP3756890 B1 EP 3756890B1
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EP
European Patent Office
Prior art keywords
ink
printing
printing ink
viscosity
measuring
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EP19183377.1A
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German (de)
English (en)
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EP3756890A1 (fr
Inventor
Rudolf Kälin
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Teca Print AG
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Teca Print AG
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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F31/00—Inking arrangements or devices
    • B41F31/02—Ducts, containers, supply or metering devices

Definitions

  • the present invention relates to a method and a device for measuring ink viscosity in pad printing.
  • the printing ink is usually adjusted to the desired viscosity with a thinner before printing begins.
  • the viscosity of the printing ink can be checked using a measuring device before the printing of usually a large number of objects is started.
  • the printing ink In order to counteract the continuous evaporation of the thinner during the printing process, the printing ink is added to the printing ink continuously or at regular intervals in most pad printing machines.
  • the evaporation rate depends on a wide variety of influences, such as the choice of printing ink, the humidity, any air movements, the printing speed, etc.
  • the viscosity is strongly dependent on the color temperature. For this reason, the evaporation rate can hardly be precisely predicted in practice and is also usually subject to fluctuations. Accordingly, the ink viscosity must be checked at regular intervals during a printing process and the supply of the thinning substance must be adjusted.
  • spatulas with a printed or embossed measurement scale are known in the prior art for checking the paint viscosity. These spatulas are dipped into the printing ink in order to measure the speed at which the printing ink flows off with the help of the scale after they have been pulled out, and thereby draw conclusions about the viscosity.
  • the colored liquid is filled into a cup that runs conically at the bottom into a hole with a precisely known diameter.
  • the viscosity of the liquid can be determined based on the volume of the cup, the diameter of the nozzle and the measured time it takes for the liquid to flow out.
  • the measuring methods with spatula and flow cup are simple to carry out and very inexpensive in terms of the measuring instrument, but unsuitable for precise viscosity determinations.
  • Such methods are at best suitable for adjusting the ink viscosity before the start of the printing process, since the initial viscosity is less important during printing than the constancy of the ink viscosity.
  • the pad printing machine Before the printing process, the pad printing machine usually has to be adjusted to the prevailing conditions, such as the printing pad used, printing speed, printing ink, etc., using its setting parameters. For most applications it is sufficient if the ink viscosity is within a certain range. In order to be able to guarantee consistent print quality and an uninterrupted printing process, however, it is important that the ink viscosity is maintained throughout the printing process printing process remains as unchanged as possible.
  • Rotational viscometers are known in the prior art, in which a rod-shaped element is dipped into the printing ink from above and is rotated there by means of a motor.
  • a measuring device is known, for example, under the name TampoVisco from Tampoprint® AG, Germany.
  • TampoVisco from Tampoprint® AG, Germany.
  • Such rotary viscometers enable the viscosity to be determined precisely, they are only intended for use outside of the pad printing machine. Such measuring devices are therefore unsuitable for continuous or regular measurements during the printing process.
  • rotational viscometers such as the Viscomat from microPrint LC GmbH, Switzerland, are known, in which a rotating element is arranged in the ink pot. By rotating the rotating element, the ink viscosity can be measured directly in the ink cup without having to remove it from the pad printing machine.
  • the disadvantage is on the one hand the more complex handling when inserting the ink cup into the pad printing machine and on the other hand the need to clean the rotating element after it has been used.
  • the DE 41 16 989 A1 a supply device for wetting the roller of a sheet-fed printing machine or strip material printing machine with varnish.
  • a flow cup fitted with measuring electrodes is used to measure the viscosity of the paint.
  • Step a. i.e. setting the printing ink in the ink container in motion
  • Step a. can be implemented very easily, for example by simply pushing or moving the ink container.
  • the ink container is an ink pot of a pad printing machine with a closed ink system
  • the ink pot movement that is present anyway between two print image transfers can be used directly, for example.
  • the measurement of the local level ie a height of the printing ink at a specific point in the ink container, can also be carried out in a very simple manner and preferably even without contact.
  • an optical measurement method based on a laser beam for example, can be used for this purpose.
  • the ink viscosity is preferably measured using the method according to the invention during the printing process or during a brief interruption in the printing process when the ink container is arranged in the pad printing machine as intended for printing.
  • the specified measurement method for determining the ink viscosity outside of the pad printing machine, for example in order to set and/or determine the ink viscosity before the start of the printing process.
  • Measuring paint viscosity may refer to measuring an absolute viscosity value.
  • the measurement of the paint viscosity preferably only means the measurement of a relative viscosity value, ie the measure determined in step e.) is a relative measure. It is therefore preferably a question of determining whether and how the viscosity of the printing ink has changed in comparison to an earlier point in time, in particular at the point in time at the beginning of the printing process.
  • the paint container is preferably not moved during the determination of the time course of the movement in step b.).
  • the point in time for starting the time course determination in step b.) is also preferably chosen such that the printing ink lowers during the determination due to the gravitational force from the point where the local water level is measured towards a state of rest.
  • the measured local water level provided that it is measured at the same point in each case, is therefore usually reduced.
  • the first and second local water level each relate to a level of the printing ink at a specific point in the ink container.
  • the two heights in steps b1.) and b2.) are determined at the same point on the paint container.
  • steps a.) to c.) are carried out several times, e.g. at regular time intervals, the waiting time defined in step b2.) by the time interval specified there advantageously remains constant.
  • the time interval specified in step b2.) is advantageously less than one second, even more advantageously less than half a second.
  • the local water level is preferably determined in a decentralized manner in the paint container, in particular in an edge region of the paint container.
  • the local water level can relate to the distance between the bottom of the ink cup (or the cliché surface) and the surface of the printing ink at a specific point in the ink cup.
  • the local water level can just as well, and is even preferred here, relate to the distance between the surface of the printing ink and a fixed point arranged above it.
  • the fixed point arranged above the surface of the printing ink can be defined by the arrangement of a measuring device, in particular an optical measuring device.
  • the word “level” therefore refers less to the distance between the ink surface and the floor on which the printing ink lies, but rather to the measuring point as a whole in a broader sense. Accordingly, the word “level” is the level of the surface of the printing ink at the measuring point, based on the Direction of gravity, meant. By the term “local level” it is meant that the level is measured at a specific location. A local water level measured at another point at the same time is usually different as long as the printing ink is still in motion.
  • step b. When determining the course of time in step b.), it is therefore particularly important to measure a change in the local level of the printing ink over a specific time.
  • the difference between the mentioned first level and the second level is preferably calculated.
  • the measure for the viscosity is then preferably determined on the basis of this calculated difference.
  • the calculated difference itself can even be used as a measure of the viscosity of the printing ink.
  • a first level can also be measured and then the time interval can be determined until the local level of the printing ink has lowered to a second predetermined level.
  • the time interval lying between two measurements does not necessarily have to be a predetermined time interval, but can also be a time interval to be determined. In this way it is also possible to determine a time course of the movement of the printing ink in the ink container by measuring a local water level according to step b.) in order to then be able to determine a measure of the viscosity of the printing ink based on this in step c.).
  • the ink container can be an ink tray of a pad printing machine with an open ink system or an ink tray of a rotary pad printing machine. With such an open system, the evaporation rate of the diluent liquid is particularly high.
  • the ink container is an ink pot of a pad printing machine with a closed ink system.
  • the ink container is then generally in contact with a cliché in such a way that the printing ink contained in the ink container contacts the cliché.
  • the ink is then preferably by means of a relative movement of the cliché to Paint container set in motion. As during the printing process, the cliché preferably moves while the ink container remains stationary.
  • a quantity and/or concentration of a diluent substance that is to be added to the printing ink is determined.
  • the measure of the viscosity of the printing ink can be shown on a display, for example, so that the operator can check the amount of thinner liquid supplied and, if necessary, adjust it based on this.
  • the quantity and/or concentration of the diluent substance to be added is displayed directly or, even more advantageously, the injection of the diluent liquid is automatically regulated by the pad printing machine based on the viscosity measure determined in step c.).
  • a quantity value and/or a concentration value is preferably selected from a limited number of predetermined quantity values and/or concentration values. This makes the regulation particularly simple and safe, since the degrees of freedom of the system are restricted.
  • the measure of viscosity determined in step c.) can be compared with a target value, for example, in order to adapt the supply of the diluent substance based on a deviation that is determined in the process.
  • the paint container has a delimited partial area.
  • the local water level is then preferably measured within this sub-area.
  • the partial area can be partially or completely separated from the rest of the interior of the paint container, for example by means of a wall.
  • the wall for separating the partial area is preferably formed by an insert part.
  • the insert part can be designed in particular as a riser pipe.
  • the paint container has a surface that extends obliquely relative to the direction of gravity.
  • the local level is then measured directly in the area of this inclined surface.
  • the obliquely extending surface is advantageously arranged at an angle of 30° to 60°, in particular approximately 45°, relative to the direction of gravity.
  • the device also preferably has an insert part, in particular a riser tube, arranged inside the ink container, with the measuring device being designed to measure the local level of the printing ink inside this insert part.
  • the device preferably has a supply device for supplying a thinner substance to the printing ink held in the paint container, with the evaluation unit preferably being designed to determine, based on the measure of the viscosity, a quantity and/or concentration of the thinner substance which is added to the printing ink by means of the supply device will be added.
  • the device is preferably designed to automatically based on the viscosity measurement control thinner injection.
  • the ink container is advantageously designed to rest against the cliché in such a way that the printing ink contained in the ink container contacts the cliché.
  • FIG 1 a first embodiment of a device according to the invention for measuring the ink viscosity in pad printing is shown.
  • the device is a pad printing machine, but only part of it is shown.
  • a cliché plate 1 and an ink cup 2 are shown.
  • the pad printing machine also has a printing pad for receiving a printed image from the cliché plate 1 and for subsequently transferring this printed image to an object to be printed.
  • the object to be printed is generally held in a print holder, which, like the printing pad, is not shown in the figures.
  • the basic structure and the mode of operation of pad printing machines are well known to those skilled in the art.
  • the one in the figure 1 So partially shown pad printing machine has a closed ink system with an ink cup 2, which is closed to the outside substantially.
  • the paint pot 2 has an upper top wall 21, from the outer edge of which a peripheral side wall 20 extends downwards.
  • a squeegee edge 25 is attached circumferentially to the lower edge of the side wall 20 .
  • the paint pot 2 is open at the bottom, ie bottomless.
  • a printing ink 3 is accommodated inside the ink pot (see, for example, Figures 2a and 2b ).
  • the ink pot 2 is pressed down onto the cliché plate 1 by means of a pressing device 4 .
  • the squeegee edge 25 is thus pressed sealingly onto the cliché plate 1 and ensures that during the printing process, when the cliché plate 1 is moved, the printing ink 3 does not emerge from the ink droplet 2, but rather remains in the known manner only within the depressions provided in the cliché plate 1 and forming the print motif. Nevertheless, it cannot be prevented that low-viscosity thinner liquid, which is mixed with the printing ink 3 , gradually escapes from the ink pot 2 .
  • the pressing device 4 has a piston rod 40 which protrudes vertically downwards and which extends into a recess 26 arranged centrally in the top wall 21 .
  • a hexagonal head 41 is attached at the lower, free end of the piston rod 40.
  • the hexagonal head 41 engages in an engagement structure which is designed to complement it and is formed by the recess 26 .
  • the piston rod 40 on the one hand exerts a constant pressure on the ink cup 2 in order to ensure that the ink cup 2 is sealed off from the cliché plate 1 .
  • the ink cup 2 is also rotated continuously during the printing process by means of the piston rod 40 in order to achieve wear of the squeegee edge 25 and the cliché plate 1 that is as uniform as possible. This rotation is made possible by the engagement of the hexagon head 41 in the complementary shaped recess 26 thereto.
  • the pressing device 4 has operating elements 42 which are used to adjust the contact pressure, the rotational speed and for various other functions. Basically, the pressing device 4 and the ink pot 2 according to the information in the CH 688 545 A5 educated.
  • the top wall 21 of the ink pot 2 has a filling opening 24 which is arranged in an outer radial area of the top wall 21 in the immediate vicinity of the side wall 20 .
  • the device has a feed device for injecting thinner liquid with an injection hose 6 .
  • the injection hose 6 protrudes from down to the top wall 21 and opens out just above an annular groove 22 formed in the top wall 21 concentrically with the recess 26.
  • the diluting liquid runs from the injection hose 6 into the annular groove 22 and via an inlet opening 23 provided within the annular groove 22 into the interior of the Paint pot 2. Due to the annular groove 22, injection through the injection hose 6 is possible regardless of the rotational position of the paint pot 2.
  • the ink 3 contained in the ink pot 2 is set in motion. This can be done, for example, by pushing the paint pot 2, ie slightly moving it.
  • the movement of cliché plate 1 relative to ink cup 2, which occurs anyway, is preferably utilized for this purpose during re-inking during the usual printing process.
  • the printing ink 3 lying on the cliché plate 1 is set in motion within the ink pot 2, so that its surface is in the Figures 2a and 2b shown oblique position occupies.
  • the movement of cliché plate 1 is then stopped in order to carry out two measurements of a local water level, ie two height measurements of printing ink 2.
  • the movement of the paint pot 2, ie in particular its rotational movement, is also advantageously stopped.
  • the local level measurement of the printing ink 3 is carried out with the aid of a laser measuring device 5 which measures the distance to the surface of the printing ink 3 through the open filling opening 24 by means of a laser beam 50 .
  • the local level or filling level of the printing ink 3 in the area of the filling opening 24 is thus measured.
  • the laser measuring device 5 is advantageously arranged directly vertically above the filling opening 24 .
  • the time of the measurement of a first water level or a first height h1 is preferably carried out when the height of the printing ink 3 in the area directly below the filling opening 24 is at its maximum. This is usually the case immediately after the movement of the cliché plate 1 (or the ink pot 2) has stopped.
  • a local water level is measured again.
  • the height of the printing ink 3 is measured by means of the laser measuring device 5 through the filling opening 24 (see FIG Figures 4a and 4b ).
  • the second height h2 measured in this way is smaller than the first height h1, since the printing ink 3 has meanwhile approached its resting position and the local filling level in the region of the filling opening 24 has reduced accordingly.
  • the difference between the first measured height h1 and the second measured height h2 can be used directly as a measure of the viscosity of the printing ink 3 if the time interval between the measurements is known.
  • the difference and the measure of the viscosity are preferably calculated or determined automatically by an evaluation unit of the device, which is not shown in the figures.
  • the printing process can be continued.
  • the printing process only has to be interrupted for a few seconds, if at all.
  • the measure determined for the ink viscosity can now be used by the evaluation unit to automatically, ie without the help of human operating personnel, determine a quantity and/or concentration of a diluent substance which is to be added to the printing ink.
  • the diluting substance usually a diluting liquid, can then likewise be automatically added to the printing ink 3 during the printing process via the injection hose 6 and the inlet opening 23 . Due to the rotational movement of the ink pot 2, but also due to the movement of the cliché plate 1 relative to the ink pot 2, the thinning substance is mixed with the printing ink 3 very quickly.
  • the ink cup can simply be rotated further until the laser beam 50 falls through the filling opening 23 onto the printing ink 3 and the laser measuring device 5 emits determined measuring distance suddenly increased.
  • one or more markings e.g. in the form of local elevations or depressions, can also be provided for this purpose on the upper side of the top wall 21, so that the correct rotational position of the paint pot 2 can be found more quickly.
  • one or more magnets 27 can also be attached to the outside of the side wall 20 (see Fig Figures 1 to 4b ). The desired rotational position can then be set quickly and easily by means of an inductive sensor 7 .
  • the correct rotational position of the ink cup 2 is preferably set while the printing process is still running, before the actual viscosity measurement is started.
  • FIG 5 a further preferred embodiment of a device according to the invention for measuring the ink viscosity in pad printing is shown.
  • the embodiment of figure 5 differs from that of figure 1 that in the area of the filling opening 24 an insert part in the form of a riser pipe 8 is arranged.
  • the riser 8 is according to the figure 6 shaped with an upper cylindrical section and a lower section in which the cylindrical shape is only formed over a portion of the circumference and is open over the remaining, larger portion.
  • the riser pipe 8 has a curved wall which extends downward on one side from the upper cylindrical section. Attached to the lower free end of this wall is an inclined surface 80 which extends radially from the inside upwards towards the wall.
  • the sloping surface 80 is then located at the very bottom in the ink cup 2. Due to the sloping surface 80, viscosity measurements can still be carried out reliably using the specified method even when the total filling level of the printing ink 3 in the ink cup 2 has been greatly reduced.
  • a variant of a riser 8 ' is in the figure 7 shown.
  • the riser pipe 8' has an overall hollow-cylindrical shape with a longitudinal slot 81 open towards the bottom. Because of the longitudinal slit 81, the water level inside the riser pipe 8' when the printing ink 3 is not moving essentially corresponds to the local water level in the immediate vicinity Area around the riser 8 'around. When the printing ink 3 is in motion, however, the level within the riser pipe 8' is essentially independent of the diameter of the ink pot 2 and can therefore also deviate from the local level in the immediate area around the riser pipe 8'.
  • the riser pipe 8 'thus brings the significant advantage that the viscosity measurement is largely independent of the diameter of the paint pot 2. The reason is that the printing ink 3, after it has been set in motion, behaves essentially the same within the riser pipe 8', independently of the ink cup size. The viscosity measurement is then particularly similar to measurement with a flow cup.
  • the advantages of the riser pipe 8 can also be combined with those of the riser pipe 8', ie the riser pipe 8' can also have an inclined surface in its lower region.
  • the filling opening can be closed and only opened during the level measurements by means of the laser measuring device 5, preferably automatically.
  • the laser measuring device 5 it is also conceivable for the laser measuring device 5 to be attached directly to the top wall 21 of the paint pot 2 and for an opening provided in the top wall 21 to be closed by the laser measuring device 5 itself.
  • the inductive sensor 7 can also be used to set the rotational position of the paint pot 2 in order to carry out the viscosity measurement using the laser measuring device 50 .
  • the Step 2a. of the example procedure would then simply be replaced with the following step: 2a. Turning the paint cup 2 until the inductive sensor 7 detects the magnet 27,
  • step 2c can be carried out in this case. omitted.
  • the method according to the invention can also be used without any problems with an open color system or with a rotary pad printing machine.
  • the rotation of the ink pot 2 during the printing process is not mandatory.
  • the measuring method can be used largely independently of whether the cliché or the ink pot is moved during the printing process.
  • any other measuring method could also be used.
  • a capacitive sensor could be attached to the paint can to measure a local level at the rim of the paint can.
  • the first and second heights of the ink need not both be measured at the same location.

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

Claims (14)

  1. Procédé de mesure de la viscosité d'une encre dans une tampographie, comprenant les étapes consistant à
    a.) mettre en mouvement une encre d'impression (3) reçue dans un récipient à encre (2) ;
    b.) déterminer une évolution dans le temps du mouvement de l'encre d'impression (3) dans le récipient à encre (2) en mesurant un niveau local (h1, h2) de l'encre d'impression (3) dans le récipient à encre (2) ; ainsi que
    c.) déterminer une mesure de la viscosité de l'encre d'impression (3) sur la base de l'évolution dans le temps déterminée à l'étape b.).
  2. Procédé selon la revendication 2, dans lequel la détermination de l'évolution dans le temps du mouvement à l'étape b.) comprend
    b1.) mesurer un premier niveau local (h1) de l'encre d'impression (3) dans le récipient à encre (2) ;
    b2.) attendre un intervalle de temps ; ainsi que
    b3.) mesurer un second niveau local (h2) de l'encre d'impression (3) dans le récipient à encre (2),
    et dans lequel la mesure de la viscosité à l'étape e.) est déterminée sur la base du premier niveau local (h1) et du second niveau local (h2).
  3. Procédé selon la revendication 1 ou 2, dans lequel le récipient à encre (2) repose contre un cliché (1) de telle manière que l'encre d'impression (3) reçue dans le récipient à encre (2) entre en contact avec le cliché (1), et l'encre d'impression (3) est mise en mouvement au moyen d'un mouvement relatif du cliché (1) par rapport au réservoir d'encre (2).
  4. Procédé selon l'une des revendications précédentes, dans lequel le niveau local (h1, h2) est mesuré sans contact, notamment au moyen d'un faisceau laser (50).
  5. Procédé selon l'une des revendications précédentes, dans lequel, sur la base de la mesure déterminée pour la viscosité, une quantité et/ou une concentration d'une substance à effet diluant destinée à être ajoutée à l'encre d'impression (3), est déterminée.
  6. Procédé selon la revendication 5, dans lequel, pour déterminer la quantité et/ou la concentration de la substance diluante, une valeur de quantité et/ou une valeur de concentration est sélectionnée parmi un nombre limité de valeurs de quantité et/ou de valeurs de concentration prédéterminées.
  7. Procédé selon l'une des revendications précédentes, dans lequel le niveau local (h1, h2) est mesuré dans une zone de bord du récipient de peinture (2).
  8. Procédé selon l'une des revendications précédentes, dans lequel les étapes a.) à c.) sont réalisées à intervalles de temps réguliers.
  9. Procédé selon l'une des revendications précédentes, dans lequel le récipient à encre (2) présente une sous-zone délimitée (8, 8') et que le niveau local (h1, h2) est mesuré à l'intérieur de cette sous-zone (8, 8 ').
  10. Procédé selon l'une des revendications précédentes, dans lequel dans le récipient à encre (2) présente une surface (80) qui s'étend obliquement par rapport à la direction de la gravité, et le niveau local (h1, h2) est mesuré directement dans la zone de cette surface oblique (80).
  11. Dispositif de mesure de la viscosité d'une encre en tampographie, notamment au moyen d'un procédé selon l'une des revendications précédentes, dans lequel le dispositif correspond à une machine à tampographie, avec un cliché (1) et un tampon d'impression pour recevoir une image à imprimer du cliché (1) et pour transférer ensuite cette image à imprimer sur un objet à imprimer, comportant également
    un récipient à encre (2) pour recevoir une encre d'impression (3);
    un dispositif de mesure (5) pour mesurer un niveau local (h1, h2) de l'encre d'impression (3) dans le récipient à encre (2) ; ainsi que
    une unité d'évaluation, qui est agencée pour déterminer une mesure de la viscosité de l'encre d'impression (3) sur la base de l'évolution dans le temps du niveau local (h1, h2) mesuré par le dispositif de mesure (5).
  12. Dispositif selon la revendication 11, comportant également une pièce à insérer (8, 8') agencée à l'intérieur du récipient à encre (2), le dispositif de mesure (5) pour mesurer le niveau local (h1, h2) de l'encre d'impression (3) étant formé à l'intérieur cette pièce à insérer (8, 8').
  13. Dispositif selon la revendication 11 ou 12, comportant également un dispositif d'alimentation (6) pour acheminer une substance à effet diluant vers l'encre d'impression (3) contenue dans le récipient à encre (2), l'unité d'évaluation étant de préférence agencée pour déterminer une quantité et/ou une concentration de la substance à effet diluant sur la base de la mesure déterminée de la viscosité, laquelle est ajoutée à l'encre d'impression (3) au moyen du dispositif d'alimentation (6).
  14. Dispositif selon l'une des revendications 11 à 13, dans lequel le récipient à encre (2) est agencé pour reposer contre le cliché (1) de telle manière que l'encre d'impression (3) reçue dans le récipient à encre (2) entre en contact avec le cliché (1).
EP19183377.1A 2019-06-28 2019-06-28 Procédé et dispositif de mesure de la viscosité de l'encre lors de la tampographie Active EP3756890B1 (fr)

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EP19183377.1A EP3756890B1 (fr) 2019-06-28 2019-06-28 Procédé et dispositif de mesure de la viscosité de l'encre lors de la tampographie

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EP3756890B1 true EP3756890B1 (fr) 2023-08-23

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Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4116989A1 (de) * 1991-05-24 1992-11-26 Klaes Paul Gmbh Einrichtung zur versorgung eines verbrauchers mit farbe oder lack
CH688545A5 (de) 1994-11-18 1997-11-14 Teca Print Ag Verfahren und Vorrichtung fuer den Tampondruck.
US20070070130A1 (en) 2005-09-27 2007-03-29 Widman Michael F Colorant presentation for pad printing

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