EP1154905B1 - Method, device and printing mould for conveying free-flowing printing ink onto a printable substance - Google Patents
Method, device and printing mould for conveying free-flowing printing ink onto a printable substance Download PDFInfo
- Publication number
- EP1154905B1 EP1154905B1 EP99964688A EP99964688A EP1154905B1 EP 1154905 B1 EP1154905 B1 EP 1154905B1 EP 99964688 A EP99964688 A EP 99964688A EP 99964688 A EP99964688 A EP 99964688A EP 1154905 B1 EP1154905 B1 EP 1154905B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cavity
- printing
- cavities
- printing ink
- gas
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
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- 229910044991 metal oxide Inorganic materials 0.000 claims description 3
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- 239000012530 fluid Substances 0.000 claims 4
- 239000000976 ink Substances 0.000 description 92
- 239000007789 gas Substances 0.000 description 79
- 239000000758 substrate Substances 0.000 description 22
- 239000011521 glass Substances 0.000 description 14
- 230000008569 process Effects 0.000 description 7
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- 239000003973 paint Substances 0.000 description 4
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- 239000000853 adhesive Substances 0.000 description 3
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- 239000010949 copper Substances 0.000 description 3
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- 101100390738 Mus musculus Fign gene Proteins 0.000 description 2
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- 239000005018 casein Substances 0.000 description 2
- BECPQYXYKAMYBN-UHFFFAOYSA-N casein, tech. Chemical compound NCCCCC(C(O)=O)N=C(O)C(CC(O)=O)N=C(O)C(CCC(O)=N)N=C(O)C(CC(C)C)N=C(O)C(CCC(O)=O)N=C(O)C(CC(O)=O)N=C(O)C(CCC(O)=O)N=C(O)C(C(C)O)N=C(O)C(CCC(O)=N)N=C(O)C(CCC(O)=N)N=C(O)C(CCC(O)=N)N=C(O)C(CCC(O)=O)N=C(O)C(CCC(O)=O)N=C(O)C(COP(O)(O)=O)N=C(O)C(CCC(O)=N)N=C(O)C(N)CC1=CC=CC=C1 BECPQYXYKAMYBN-UHFFFAOYSA-N 0.000 description 2
- 235000021240 caseins Nutrition 0.000 description 2
- 239000000839 emulsion Substances 0.000 description 2
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- 229920000647 polyepoxide Polymers 0.000 description 2
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
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Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M1/00—Inking and printing with a printer's forme
- B41M1/10—Intaglio printing ; Gravure printing
Definitions
- the invention relates to a method, a device and a printing form for Transfer of flowable printing ink to a substrate.
- liquid printing ink e.g. ink
- the patterns to be printed are on the printing form applied.
- the patterns can be in the form of depressions or elevations be applied to a surface.
- Ink is then applied to the ridges (High pressure) applied or pressed into the depressions (gravure) and transferred to the substrate by contact with the substrate.
- the invention therefore has as its object a method and a device to create substrates for printing on those with only a printing form, different patterns can be printed.
- the invention provides a printing form according to claim 1 to 19, an apparatus according to claim 30 and a method according to Claim 31 proposed. Additional developments of the invention result itself from the subclaims.
- the object is achieved in that the surface of the Printing form a grid of fine openings is embedded.
- the fine openings form the halftone dots from which a pattern to be printed is built can.
- Individual openings are made according to the given pattern - halftone dots - selected in the according to the inventive method Ink is sucked.
- Each of the openings opens into one behind lying cavity, which is heated and cooled by suitable devices can be, whereby the gases in the cavity are heated or cooled, and this changes the gas temperature in the cavity.
- the gas pressure in front of an opening and in the cavity behind it is the same if the opening is free.
- Lowering the gas temperature in the cavity reduces the gas pressure in the Cavity. This causes the outer, now higher gas pressure, printing ink presses into the opening.
- the surface properties of the printing form and the properties of the Printing inks are expediently coordinated with one another in such a way that the Ink does not wet the fine openings in the printing form, and thus without a pressure difference between a cavity and the outside environment no printing ink can get into the corresponding opening.
- the printing of a given pattern is done by that one specifically heats individual cavities of the printing form, then the surface of the printing form covered with printing ink and thus gas-tightly covers all openings with printing ink, and then the gas temperature the selected cavities are lowered again by cooling.
- Corresponding the given pattern is then openings with printing ink filled, or completely free of printing ink.
- Color residues located between the openings should be removed using be removed using a suitable device. For example with the help of a squeegee or by designing the between the Open areas of the surface of the printing form as printing inks be repellent. Then the pressure can be achieved by contacting the Printing form with the printing material. The resolution with which the printed image depends on the distance between the openings.
- Residues of the printing ink can be removed by a suitable device from the printing form can be removed. Color residues can e.g. to be wiped off.
- the printing method according to the invention allows different, depending on the specification a lot of printing ink per halftone dot towards the substrate transmit that the gas in the cavities warms to different degrees becomes. This results in different gas temperatures in the heated ones Cavities which, with otherwise identical cavities, After cooling, different amounts of printing ink are pressed into the openings is, and thus also advantageously different amounts of printing ink per Screen dot can be transferred to the substrate.
- the openings in the printing form do not have a circular cross-sectional area have different surfaces are conceivable.
- the opening must not be closed become small, otherwise the pressure difference may no longer be sufficient, to ink against the effect of its surface tension in the opening to press.
- the opening must not be too big, otherwise the Pressure difference can no longer be sufficient to oppose the printing ink To keep the effect of gravity in the openings.
- Printing ink can be applied to the printing form in different ways become. You can spread or spray ink. Particularly advantageous the printing form can also be immersed in the printing ink. It is important here that one opens openings from cavities with heated ones Gas fillings covered by printing ink gastight before the gas filling again is cooled. Printing ink only penetrates through the cooling of the gas filling an opening.
- the application of the ink, the size of the openings and the surface properties of the printing form and the printing ink should expediently be coordinated with one another such that the application alone, no ink penetrates the openings.
- An essential aspect of the invention is the generation of negative pressure by heating the gas filling in the cavities of the printing form and subsequent Cooling down.
- Different techniques are suitable to bring about heating.
- the heating can take place via an electrical resistance heating, if each of the cavities of the printing form with resistance heating is equipped, which can be switched on and off individually.
- energy to warm the gas filling can also by inductive or capacitive Electrical energy is coupled into the vicinity of the cavities, which is ultimately converted into thermal energy.
- Particularly suitable for that printing method according to the invention is the transfer of energy for Heating the gas filling by means of electromagnetic radiation and here especially energy transmission with laser light. In the last three Cases of energy will pass through in the cavities or adjacent these associated elements are converted into heat.
- the gas filling can also be heated by the direct inductive, capacitive or resistive coupling of energy into the gas. It is also possible to fill gas by direct absorption of electromagnetic To heat radiation through the gas.
- air has the advantage of two physical properties of air advantageously used for the invention can be. This is because air has good thermal conductivity, i.e. that an air volume can be heated very quickly. This is in the invention to the extent that those cavities are sucked into the printing ink should be warmed up very quickly, resulting in short print cycle times leads. However, air also has a relatively poor rating Thermal conductivity, is therefore not well suited for heat transport. This effect, which has an insulating effect in this respect, has in the invention the advantage that the printing form in the vicinity of the cavities only one is exposed to low temperatures.
- the individual cavities of the printing form should be sufficiently good against each other be thermally insulated so that gas fillings are specifically heated in cavities can be filled with gas from cavities in the immediate vicinity Neighborhood can also be warmed thereby, making it reliable can be prevented after covering the openings with printing ink and cooling the gas filling, ink is sucked into openings is not filled with ink for printing the specified pattern should be.
- the measure for a sufficiently good thermal insulation is also determined by the Period between the start of heating the gas filling in a cavity and covering the associated opening with ink. An increase in the period requires an improvement in the thermal Insulation between the cavities to prevent temperature changes in the Cavities harmless due to heat conduction between the cavities to keep.
- the printing form can be a flat or curved plate, particularly suitable is the execution of the printing form as a hollow cylinder.
- the warmed must Gas filling can be cooled appropriately.
- the cooling can e.g. about a gas flow occur at least on parts of the outer surface the cavities act. Some of the cooling effect can also take place before the printing ink run out when gas of a warmed gas filling with the cooler Ink comes into contact.
- the transfer of printing ink from the printing form according to the invention to the Substrate can be supported by filling gas in the Cavities of the printing form are heated.
- the heating of the gas filling in A cavity leads to an increase in pressure in the cavity if the associated one
- the opening is filled gas-tight with printing ink. By increasing the pressure printing ink is then pressed out of the opening. The ink can then easily absorbed by the substrate.
- a printing cycle consists of heating the Gas fillings of selected cavities, then covering the Openings with printing ink, the subsequent cooling of heated gas fillings, the subsequent removal of unnecessary ink and finally transferring ink from openings in the printing form the substrate.
- the transfer / discharge can be done by heating gas fillings be supported in cavities.
- a pattern can also be printed by first Openings in the printing form in the manner described above with printing ink be filled, and the pattern on the substrate is created in that only selected cavities are heated and only printing ink from the related openings, if necessary, in different quantities - due to different heating - then gets onto the substrate.
- a print made in this way presupposes that without the Heating of gas fillings in cavities no printing ink on the substrate can reach. This means that ink is only in the openings may be present.
- the change in volume in the cavity can be caused by a deformable and / or movable wall area (e.g. by pistons or Membrane) can be reached.
- An increase in volume of the cavity after covering with printing ink leads to a reduction in pressure in the cavity. This draws in ink.
- a pressure increase in the cavity will achieved by reducing the volume.
- the pressure increase in the cavity can support the ink transfer from the printing form to the substrate.
- the vacuum generating device is expediently by a deformable and / or movable wall area of the cavity, wherein the wall area is biased into and out of a first position out can be transferred into a second position by means of an actuator and that Volume of the cavity is larger in the first position of the wall area than in the second position.
- This device can also be used for spreading or used to aid in ink delivery from the cavity are reduced by reducing the volume of the cavity over the wall area becomes.
- the facility expediently to generate a negative pressure in a cavity leave a cooling device for cooling and / or cooling of the gas in the cavity so that by cooling and / or cooling leave the gas in a cavity with the opening covered with ink of the cavity, the gas in a printing ink sucking into the cavity Vacuum is exposed.
- the heating required for this is for example designed as a resistance heating element.
- the heating is in the cavity or in thermal contact with it or its wall.
- the heater can be in a cavity as a result of absorption Heating element heating electromagnetic radiation be, this absorption heating element in particular a metal oxide having.
- the heating it is also possible for the heating to be implemented using an energy source is whose energy is inductive, capacitive or resistive in gas volumes in the Cavities is injected, or that the energy source is electromagnetic Emits radiation that is absorbed by gas volumes in the cavities becomes.
- the groups of cavities addressed here are for example by one or more rows of side by side or one above the other arranged cavities on the surface of the printing form. While in this variant, all the cavities in a group are provided with printing ink to then selectively by selective control of the cavities print, in a variant of this procedure it is provided that the printing ink into the openings and into the areas of selected cavities close to the opening a group of cavities is sucked and further in particular that the discharge of the printing ink from selectively printing cavities a group of cavities by overpressure in all cavities a group of cavities.
- Fig. 1 is an embodiment for a flat and in Fig. 2 a curved Print form shown.
- the curved part of a printing form can also be part of a printing form in the form of a hollow cylinder.
- the printing form is characterized by a grid of openings 1, introduced in a flat or curved plate, or on the outside of a hollow cylinder.
- Cavities 2 are arranged behind the openings 1. Any cavity 2 has only the opening 1, so it is only towards the surface of the printing form open. Ink can be sucked into the openings.
- One page at a time the cavities 2 is a plug 3 made of a good heat conductor Material formed. The heat conduction through the plug 3 ensures that thermal energy in the plug 3, applied e.g.
- the laser light is irradiated in troughs 4, each one individually Openings are assigned.
- a gas jet can be used to cool the gas fillings be directed at the hollows.
- the individual openings 1, cavities 2, Stopper 3 and troughs 4 are embedded in a matrix 5, which for the necessary thermal insulation between different openings 1, Cavities 2, plugs 3 and troughs 4 ensures.
- printing form 6 is a hollow cylinder according to FIG. 2, with the openings 1 for the color entry on the outside of the hollow cylinder.
- Heating bar 7 and cooling bar 8 are arranged on the inside of the hollow cylinder. They extend over the full length of the printing form 6, and enable heating and cooling cavities of the printing form 6. Die Printing form rotates around an axis 10 connected to a frame 9. Heating bar 7 and cooling beam 8 are connected to a frame 9. The heating beam 7 has the task of cavities 2 in the printing form 6 according to the to heat the printing pattern, whereby in this version only one strip-shaped area of the printing form 6 lies under the heating beam 7.
- the Heating bar 7 contains devices which laser light according to the Direct the printing pattern into troughs 4. Laser light is absorbed in a trough 4 and converted into thermal energy, and ultimately one Gas filling warmed up. The laser light is from an externally arranged laser 11 directed via optical fibers 12 in the heating beam 7.
- Control signals for distraction of the laser light in the individual troughs of the printing form are in an external device 13 processed and via a cable 14 in the heating beam 7 headed.
- the printing form 6 moves due to its rotation about the axis 10 past the heating beam 7.
- the associated openings 1 are covered with printing ink 15, in which the outer surface of the printing form is immersed in printing ink 15 becomes.
- the printing ink 15 is located in a trough 16 under the printing form 6.
- the cooling beam 8 covers one Strip of printing form 6, and cooling takes place via a gas stream which is in the troughs 4 moved past the chilled beam 8 is directed.
- the cooling air is fed to the chilled beam 8 via a hose line 17. By cooling this reduces the gas pressure in the previously heated cavities ink is pressed into openings.
- the cavities can be heated to different degrees, this way advantageously different amounts of printing ink in the corresponding Openings pressed.
- a knife squeegee 18 strips off excess ink from the printing form 6 before the printing form 6 is brought into contact with the printing material 19, and Printing ink reaches the substrate 19 from the openings 1.
- the roller 20 presses the printing material 19 against the printing form 6. Through the rollers 21 the printing material 19 is guided.
- a feed line 23 supplies the heating bar 22 with the necessary energy.
- the printing form is as a thin-walled tube is formed, in which the cavities and openings are incorporated.
- the printing form can be connected to the tube ends with clamping elements be that exert a tensile stress on the printing form parallel to the tube axis and thus align and mechanically stabilize the printing form.
- a thin-walled printing form can advantageously be mechanically provided by a gas cushion be stabilized.
- a tubular, thin-walled printing form 6 is shown, the the ends are connected to tensioning elements 24.
- Printing form 6 and clamping elements 24 are pushed over a mandrel 25.
- the mandrel 25 is fixed with connected to a frame 9.
- Clamping elements 24 and printing form 6 are around Mandrel 25 rotatably arranged, and are guided by bearings 28.
- a clamping screw 29 can exert a tensile stress on the printing form 6 which aligns the printing form 6 and stabilizes it mechanically.
- the printing form 6 can be replaced by a gas cushion between the printing form 6 and the opposite surface of the mandrel 25 mechanically stabilized become.
- the gas cushion is in a narrow gap between the printing form 6 and the outer surface of the mandrel 25 are formed by compressed gas.
- the gas cushion can the printing form 6 perpendicular to the surface, and in the direction on the axis of rotation, can be loaded by pressure without the printing form 6 touches the mandrel 25.
- the pressure is exerted on the mandrel 25 by the gas cushion transfer. From fine nozzle openings 30, distributed over the outer Surface of the mandrel 25, gas for the air cushion is pressed into the gap.
- a supply channel 31 leads compressed gas to the nozzle openings 30 Feeding compressed gas into the gas cushion will also be one for the Printing process advantageously achieved cooling of the printing form, since it is for the Printing process is advantageous if, in addition to heating, cooling the gas filling takes place in the cavities.
- Fig. 4 is a heating beam 7 with an optical fiber 12 drawn.
- a pressure cycle consists of heating the gas fillings (Fig. 5) selected cavities - in this case by means of a resistance heater 32 -, then covering the openings with printing ink (Fig. 6), the subsequent cooling of heated gas fillings (Fig. 7), the then subsequent removal of unnecessary ink (Fig. 8) and finally the transfer of printing ink from openings in the printing form to the substrate (Fig 9).
- the transfer / discharge can be done by heating gas fillings be supported in cavities.
- Casein emulsion paint black plaka paint from Pelikan
- Water in the ratio of one volume of paint to two volumes of water can be used as printing ink.
- a printing form according to the invention for printing with this printing ink consists of a square, 10 mm thick plate made of Teflon. The edge length of the plate is 50 mm. Perpendicular through holes of the same type are drilled into the surface of the Teflon plate. The through holes have a drilling depth of up to one millimeter a diameter of 0.4 mm. The bore diameter then widens from 0.4 mm to a diameter of 0.9 mm.
- the holes in the Plate form a grid with a hexagonal structure. Between There is a grid spacing of 2 mm.
- glass tubes are inserted. One end of each glass tube is closed, and the Glass tubes were inserted with the open end first.
- the glass tubes are 15 mm long, have an outer diameter of 0.9 mm and a Inner diameter of 0.4 mm, they were inserted 9 mm deep into the holes.
- the gap between the glass tube and Teflon was covered with epoxy resin adhesive sealed gastight.
- One end of each of the glass tubes was sealed gas-tight with a drop of epoxy resin adhesive.
- the adhesive is pressed 2 mm deep into the glass tubes and encloses each glass tube two 0.1 mm thick copper wires that do not touch and 3 mm deep are inserted into the individual glass tubes so that they cover the adhesive layer pierce inside the glass tube.
- the two copper wires are in the glass tube electrically connected with a 20 mm long thin wire made of constantan.
- the ohmic resistance of the constantan wire bridge is 4 ⁇ .
- the constantan wires are all completely in the glass tubes.
- An electrical current flowing from the outside over the copper wires through the Constantan Bridge flows, heats the wire and heats up the Gas filling in the glass tube.
- the cavity in the glass tube and the volume of 1 mm long part of the through hole with 0.4 mm diameter in Teflon a cavity according to the invention in the printing form, with the 0.4 mm Hole in the Teflon plate as an opening. Teflon is thinned out by the diluted casein emulsion paint not wetted.
- the gas fillings in the cavities are heated, the associated openings of which are intended to draw in ink. This happens with an electrical voltage of 1.2 volts with which the resistance heaters of the selected cavities for 0.5 seconds.
- the openings The printing form will be 0.1 seconds before the power supplies for the Resistance heaters are turned off by a surge of printing ink covered with ink. Two seconds later when the gas temperature is in the gas fillings warmed up by the resistance heating almost again Has reached ambient temperature, the ink can be coated with a rubber squeegee be wiped off the surface of the printing form. Printing ink was only sucked in from the openings with heated gas fillings. For printing on the substrate, the printing form is placed on the substrate.
- the resistance heaters of all Cavities supplied with an electrical voltage of 1.2 volts. hereby the gas fillings in the cavities are heated, causing printing ink to come out the openings of the printing form filled with printing ink by the gas pressure in the Cavity is pressed onto the substrate.
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- Printing Methods (AREA)
- Ink Jet (AREA)
- Electronic Switches (AREA)
- Impression-Transfer Materials And Handling Thereof (AREA)
Description
Die Erfindung betrifft ein Verfahren, eine Vorrichtung und eine Druckform zum Übertragen von fließfähiger Druckfarbe auf einen Bedruckstoff.The invention relates to a method, a device and a printing form for Transfer of flowable printing ink to a substrate.
Es gibt Druckverfahren, bei denen flüssige Druckfarbe (z.B. Tinte) durch Kontakt zwischen einer Druckform und Bedruckstoff auf diesen übertragen wird. Bei den bekannten Verfahren sind die zu druckenden Muster auf der Druckform aufgebracht. Die Muster können in Form von Vertiefungen oder Erhöhungen auf eine Fläche aufgebracht sein. Druckfarbe wird dann auf die Erhöhungen (Hochdruck) aufgebracht oder in die Vertiefungen (Tiefdruck) gedrückt und durch Kontakt mit dem Bedruckstoff auf den Bedruckstoff übertragen.There are printing processes in which liquid printing ink (e.g. ink) by contact between a printing form and printing material is transferred to this. In the known methods, the patterns to be printed are on the printing form applied. The patterns can be in the form of depressions or elevations be applied to a surface. Ink is then applied to the ridges (High pressure) applied or pressed into the depressions (gravure) and transferred to the substrate by contact with the substrate.
Die genannten Verfahren haben den Nachteil, dass jedes neue, zu druckende Muster eine neue Druckform erfordert.The methods mentioned have the disadvantage that each new one to be printed Pattern requires a new printing form.
Die Erfindung macht sich deshalb zur Aufgabe, ein Verfahren und eine Vorrichtung zum Bedrucken von Bedruckstoffen zu schaffen, bei denen mit nur einer Druckform, unterschiedliche Muster gedruckt werden können.The invention therefore has as its object a method and a device to create substrates for printing on those with only a printing form, different patterns can be printed.
Zur Lösung dieser Aufgabe wird mit der Erfindung eine Druckform nach Anspruch
1 bis 19, eine Vorrichtung nach Anspruch 30 und ein Verfahren nach
Anspruch 31 vorgeschlagen. Zusätzliche Weiterbildungen der Erfindung ergeben
sich aus den Unteransprüchen.To solve this problem, the invention provides a printing form according to
Erfindungsgemäß wird die Aufgabe dadurch gelöst, dass in die Oberfläche der Druckform ein Raster feiner Öffnungen eingelassen ist. Die feinen Öffnungen bilden die Rasterpunkte, aus denen ein zu druckendes Muster aufgebaut werden kann. Entsprechend dem vorgegebenen Muster werden einzelne Öffnungen - Rasterpunkte - ausgewählt, in die nach dem erfindungsgemäßen Verfahren Druckfarbe gesaugt wird. Jede der Öffnungen mündet in einen dahinter liegenden Hohlraum, der durch geeignete Vorrichtungen beheizt und gekühlt werden kann, wodurch die Gase im Hohlraum erwärmt oder gekühlt werden, und hierdurch sich die Gastemperatur im Hohlraum verändert. Zu jedem Hohlraum gibt es nur eine Öffnung, nämlich diejenige in der Oberfläche der Druckform. Der Gasdruck vor einer Öffnung und im dahinter liegenden Hohlraum ist derselbe, wenn die Öffnung frei ist. Druckfarbe wird dadurch in eine Öffnung gezogen, dass nach Erwärmung der Gase in einem ausgewählten Hohlraum, die Öffnung gasdicht mit Druckfarbe abgedeckt wird, und dass man im Anschluss daran die Gastemperatur im Hohlraum wieder absenkt. Durch Absenkung der Gastemperatur im Hohlraum verringert sich der Gasdruck im Hohlraum. Dies führt dazu, dass der äußere, jetzt höhere Gasdruck, Druckfarbe in die Öffnung presst.According to the invention, the object is achieved in that the surface of the Printing form a grid of fine openings is embedded. The fine openings form the halftone dots from which a pattern to be printed is built can. Individual openings are made according to the given pattern - halftone dots - selected in the according to the inventive method Ink is sucked. Each of the openings opens into one behind lying cavity, which is heated and cooled by suitable devices can be, whereby the gases in the cavity are heated or cooled, and this changes the gas temperature in the cavity. To each There is only one opening, namely that in the surface of the cavity Printing form. The gas pressure in front of an opening and in the cavity behind it is the same if the opening is free. This turns printing ink into a Opening that is drawn after heating the gases in a selected Cavity, the opening is gas-tightly covered with ink, and that one then the gas temperature in the cavity is reduced again. By Lowering the gas temperature in the cavity reduces the gas pressure in the Cavity. This causes the outer, now higher gas pressure, printing ink presses into the opening.
Die Oberflächeneigenschaften der Druckform und die Eigenschaften der Druckfarbe sind zweckmäßigerweise derart aufeinander abgestimmt, dass die Druckfarbe die feinen Öffnungen in der Druckform nicht benetzt, und somit ohne eine Druckdifferenz zwischen einem Hohlraum und der äußeren Umgebung keine Druckfarbe in die zugehörige Öffnung gelangen kann.The surface properties of the printing form and the properties of the Printing inks are expediently coordinated with one another in such a way that the Ink does not wet the fine openings in the printing form, and thus without a pressure difference between a cavity and the outside environment no printing ink can get into the corresponding opening.
Der Druck eines vorgegebenen Musters, jeweils für eine Farbe, erfolgt dadurch, dass man gezielt einzelne Hohlräume der Druckform beheizt, anschließend die Oberfläche der Druckform mit Druckfarbe bedeckt und damit sämtliche Öffnungen mit Druckfarbe gasdicht abdeckt, und dann die Gastemperatur der ausgewählten Hohlräume durch Kühlung wieder absenkt. Entsprechend dem vorgegebenen Muster sind dann Öffnungen mit Druckfarbe gefüllt, oder aber ganz frei von Druckfarbe. An der Oberfläche der Druckform befindliche Farbreste, die sich zwischen den Öffnungen befinden, sollten mittels einer geeigneten Vorrichtung entfernt werden. Dies kann beispielsweise mit Hilfe einer Rakel erfolgen oder durch Ausgestaltung der zwischen den Öffnungen befindlichen Bereichen der Oberfläche der Druckform als Druckfarben abweisend realisiert sein. Anschließend kann der Druck durch Kontakt der Druckform mit dem Bedruckstoff erfolgen. Die Auflösung mit der das Druckbild entsteht, ist abhängig von den Abständen zwischen den Öffnungen.The printing of a given pattern, each for one color, is done by that one specifically heats individual cavities of the printing form, then the surface of the printing form covered with printing ink and thus gas-tightly covers all openings with printing ink, and then the gas temperature the selected cavities are lowered again by cooling. Corresponding the given pattern is then openings with printing ink filled, or completely free of printing ink. On the surface of the printing form Color residues located between the openings should be removed using be removed using a suitable device. For example with the help of a squeegee or by designing the between the Open areas of the surface of the printing form as printing inks be repellent. Then the pressure can be achieved by contacting the Printing form with the printing material. The resolution with which the printed image depends on the distance between the openings.
Nach dem Druck kann es notwendig sein, Farbreste von der Druckform zu entfernen. Reste der Druckfarbe können durch eine geeignete Vorrichtung von der Druckform entfernt werden. Farbreste können z.B. abgewischt werden.After printing, it may be necessary to remove ink residue from the printing form remove. Residues of the printing ink can be removed by a suitable device from the printing form can be removed. Color residues can e.g. to be wiped off.
Das erfindungsgemäße Druckverfahren erlaubt es, je nach Vorgabe, unterschiedlich viel Druckfarbe pro Rasterpunkt auf den Bedruckstoff dadurch zu übertragen, dass das Gas in den Hohlräumen unterschiedlich stark erwärmt wird. Hierdurch ergeben sich unterschiedliche Gastemperaturen in den beheizten Hohlräumen, die dazu führen, dass bei sonst gleichen Hohlräumen, nach dem Abkühlen, unterschiedlich viel Druckfarbe in die Öffnungen gedrückt wird, und damit auch vorteilhaft unterschiedlich viel Druckfarbe pro Rasterpunkt auf den Bedruckstoff übertragen werden kann.The printing method according to the invention allows different, depending on the specification a lot of printing ink per halftone dot towards the substrate transmit that the gas in the cavities warms to different degrees becomes. This results in different gas temperatures in the heated ones Cavities which, with otherwise identical cavities, After cooling, different amounts of printing ink are pressed into the openings is, and thus also advantageously different amounts of printing ink per Screen dot can be transferred to the substrate.
Die Öffnungen in der Druckform müssen keine kreisförmige Querschnittsfläche aufweisen, davon abweichende Flächen sind denkbar. Für die Abmessung der Öffnung gibt es eine obere und eine untere Grenze. Die Öffnung darf nicht zu klein werden, da sonst die Druckdifferenz nicht mehr ausreichend sein kann, um Druckfarbe gegen die Wirkung seiner Oberflächenspannung in die Öffnung zu drücken. Die Öffnung darf aber auch nicht zu groß werden, da sonst die Druckdifferenz nicht mehr hinreichend sein kann, um Druckfarbe entgegen der Wirkung der Schwerkraft in den Öffnungen zu halten.The openings in the printing form do not have a circular cross-sectional area have different surfaces are conceivable. For the dimension of the Opening there is an upper and a lower limit. The opening must not be closed become small, otherwise the pressure difference may no longer be sufficient, to ink against the effect of its surface tension in the opening to press. The opening must not be too big, otherwise the Pressure difference can no longer be sufficient to oppose the printing ink To keep the effect of gravity in the openings.
In unterschiedlicher Weise kann Druckfarbe auf die Druckform aufgebracht werden. Man kann Druckfarbe aufstreichen oder aufspritzen. Besonders vorteilhaft kann die Druckform aber auch in die Druckfarbe eingetaucht werden. Hierbei ist wichtig, dass man Öffnungen von Hohlräumen mit erwärmten Gasfüllungen durch Druckfarbe gasdicht abdeckt, bevor die Gasfüllung wieder abgekühlt wird. Druckfarbe dringt erst durch die Abkühlung der Gasfüllung in eine Öffnung ein. Die Aufbringung der Druckfarbe, die Größe der Öffnungen und die Oberflächeneigenschaften der Druckform und der Druckfarbe sollten zweckmäßigerweise so aufeinander abgestimmt sein, dass durch die Aufbringung alleine keine Druckfarbe in die Öffnungen eindringt.Printing ink can be applied to the printing form in different ways become. You can spread or spray ink. Particularly advantageous the printing form can also be immersed in the printing ink. It is important here that one opens openings from cavities with heated ones Gas fillings covered by printing ink gastight before the gas filling again is cooled. Printing ink only penetrates through the cooling of the gas filling an opening. The application of the ink, the size of the openings and the surface properties of the printing form and the printing ink should expediently be coordinated with one another such that the application alone, no ink penetrates the openings.
Ein wesentlicher Aspekt der Erfindung ist die Unterdruckerzeugung durch Erwärmung der Gasfüllung in den Hohlräumen der Druckform und anschließende Abkühlung. Unterschiedliche Techniken sind geeignet, die Erwärmung herbeizuführen. Die Erwärmung kann über eine elektrische Widerstandsheizung erfolgen, wenn jeder der Hohlräume der Druckform mit einer Widerstandsheizung ausgestattet ist, die einzeln ein- und ausgeschaltet werden kann. Energie zur Erwärmung der Gasfüllung kann aber aucb durch induktive oder kapazitive Einkopplung elektrischer Energie in die Nähe der Hohlräume erfolgen, welche letztlich in thermische Energie umgewandelt wird. Besonders geeignet für das erfindungsgemäße Druckverfahren ist die Übertragung von Energie zur Erwärmung der Gasfüllung mittels elektromagnetischer Strahlung und hier insbesondere die Energieübertragung mit Laserlicht. In den letzten drei genannten Fällen wird die Energie durch in den Hohlräumen oder angrenzend an diese zugeordnete Elemente in Wärme umgesetzt.An essential aspect of the invention is the generation of negative pressure by heating the gas filling in the cavities of the printing form and subsequent Cooling down. Different techniques are suitable to bring about heating. The heating can take place via an electrical resistance heating, if each of the cavities of the printing form with resistance heating is equipped, which can be switched on and off individually. energy to warm the gas filling can also by inductive or capacitive Electrical energy is coupled into the vicinity of the cavities, which is ultimately converted into thermal energy. Particularly suitable for that printing method according to the invention is the transfer of energy for Heating the gas filling by means of electromagnetic radiation and here especially energy transmission with laser light. In the last three Cases of energy will pass through in the cavities or adjacent these associated elements are converted into heat.
Alternativ kann die Erwärmung der Gasfüllung auch durch die direkte induktive, kapazitive oder resistive Einkopplung von Energie in das Gas erfolgen. Es ist auch möglich, Gasfüllungen durch die direkte Absorption elektromagnetischer Strahlung durch das Gas zu erwärmen.Alternatively, the gas filling can also be heated by the direct inductive, capacitive or resistive coupling of energy into the gas. It is also possible to fill gas by direct absorption of electromagnetic To heat radiation through the gas.
Die Verwendung von Luft als Gas in den Hohlräumen hat den Vorteil, dass zwei physikalische Eigenschaften von Luft vorteilhaft für die Erfindung ausgenutzt werden können. Luft weist nämlich eine gute Temperaturleitfähigkeit auf, d.h. dass sich ein Luftvolumen sehr schnell erwärmen lässt. Dies ist bei der Erfindung insoweit von Vorteil, als diejenigen Hohlräume, in die Druckfarbe angesaugt werden soll, sich sehr schnell erwärmen lassen, was zu kurzen Druckzykluszeiten führt. Luft weist darüber hinaus jedoch eine relativ schlechte Wärmeleitfähigkeit auf, ist also für den Wärmetransport nicht gut geeignet. Dieser insoweit isolierende Wirkung aufweisende Effekt hat bei der Erfindung den Vorteil, dass die Druckform in der Umgebung der Hohlräume einer lediglich geringen Erwärmung ausgesetzt ist.The use of air as the gas in the cavities has the advantage of two physical properties of air advantageously used for the invention can be. This is because air has good thermal conductivity, i.e. that an air volume can be heated very quickly. This is in the invention to the extent that those cavities are sucked into the printing ink should be warmed up very quickly, resulting in short print cycle times leads. However, air also has a relatively poor rating Thermal conductivity, is therefore not well suited for heat transport. This effect, which has an insulating effect in this respect, has in the invention the advantage that the printing form in the vicinity of the cavities only one is exposed to low temperatures.
Die einzelnen Hohlräume der Druckform sollten gegeneinander hinreichend gut thermisch isoliert sein, damit gezielt Gasfüllungen in Hohlräumen erwärmt werden können, ohne dass Gasfüllungen von Hohlräumen in der unmittelbaren Nachbarschaft hierdurch ebenfalls erwärmt werden, so dass zuverlässig verhindert werden kann, dass nach dem Abdecken der Öffnungen mit Druckfarbe und dem Abkühlen der Gasfüllung, Druckfarbe in Öffnungen gesaugt wird, die für den Druck des vorgegebenen Musters nicht mit Druckfarbe gefüllt sein sollen.The individual cavities of the printing form should be sufficiently good against each other be thermally insulated so that gas fillings are specifically heated in cavities can be filled with gas from cavities in the immediate vicinity Neighborhood can also be warmed thereby, making it reliable can be prevented after covering the openings with printing ink and cooling the gas filling, ink is sucked into openings is not filled with ink for printing the specified pattern should be.
Das Maß für eine hinreichend gute thermische Isolierung wird auch durch den Zeitraum zwischen dem Beginn der Erwärmung der Gasfüllung in einem Hohlraum und dem Abdecken der zugehörigen Öffnung mit Druckfarbe beeinflusst. Eine Vergrößerung des Zeitraums erfordert eine Verbesserung der thermischen Isolierung zwischen den Hohlräumen, um Temperaturveränderungen in den Hohlräumen durch Wärmeleitung zwischen den Hohlräumen unschädlich gering zu halten.The measure for a sufficiently good thermal insulation is also determined by the Period between the start of heating the gas filling in a cavity and covering the associated opening with ink. An increase in the period requires an improvement in the thermal Insulation between the cavities to prevent temperature changes in the Cavities harmless due to heat conduction between the cavities to keep.
Die Druckform kann eine ebene oder gewölbte Platte sein, besonders geeignet ist die Ausführung der Druckform als Hohlzylinder.The printing form can be a flat or curved plate, particularly suitable is the execution of the printing form as a hollow cylinder.
Nach dem gasdichten Abdecken der Öffnungen zu den Hohlräumen mit erwärmten oder nicht erwärmten Gasfüllungen durch Druckfarbe, muß die erwärmte Gasfüllung geeignet abgekühlt werden. Die Abkühlung kann z.B. über eine Gasströmung erfolgen, die zumindest auf Teile der äußeren Oberfläche der Hohlräume einwirkt. Ein Teil der Kühlwirkung kann auch vort der Druckfarbe ausgehen, wenn Gas einer erwärmten Gasfüllung mit der kühleren Druckfarbe in Berührung kommt. After gas-tight covering the openings to the cavities with heated or unheated gas fillings through printing ink, the warmed must Gas filling can be cooled appropriately. The cooling can e.g. about a gas flow occur at least on parts of the outer surface the cavities act. Some of the cooling effect can also take place before the printing ink run out when gas of a warmed gas filling with the cooler Ink comes into contact.
Durch die Kühlung sollte die Gastemperatur in dem die Druckform von außen umgebenden Gas nicht unterschritten werden, da sonst auch in Hohlräumen mit nicht erwärmten Gasfüllungen, nach der gasdichten Abdeckung mit Druckfarbe, ein Unterdruck entsteht, der Druckfarbe in Öffnungen drücken kann.By cooling the gas temperature should be in the printing form from the outside surrounding gas must not be fallen below, otherwise also in cavities with unheated gas fillings, after the gastight cover with Printing ink, a negative pressure is created, press the printing ink into openings can.
Der Übertrag von Druckfarbe von der erfindungsgemäßen Druckform auf den Bedruckstoff kann dadurch unterstützt werden, dass Gasfüllungen in den Hohlräumen der Druckform erhitzt werden. Die Erwärmung der Gasfüllung in einem Hohlraum führt zu einer Druckerhöhung im Hohlraum, wenn die zugehörige Öffnung gasdicht mit Druckfarbe gefüllt ist. Durch die Druckerhöhung wird Druckfarbe dann aus der Öffnung heraus gepresst. Die Druckfarbe kann dann leicht vom Bedruckstoff aufgenommen werden.The transfer of printing ink from the printing form according to the invention to the Substrate can be supported by filling gas in the Cavities of the printing form are heated. The heating of the gas filling in A cavity leads to an increase in pressure in the cavity if the associated one The opening is filled gas-tight with printing ink. By increasing the pressure printing ink is then pressed out of the opening. The ink can then easily absorbed by the substrate.
Nach dem Übertrag bzw. Austrag von Druckfarbe auf den Bedruckstoff wird durch Kühlung der Hohlräume dafür gesorgt, dass die Gastemperaturen in den Hohlräumen ausgeglichen sind. Dies dient als Vorbereitung für einen neuen Druckzyklus. Ein Druckzyklus setzt sich zusammen aus dem Erwärmen der Gasfüllungen ausgewählter Hohlräume, einem anschließenden Abdecken der Öffnungen mit Druckfarbe, dem nachfolgenden Abkühlen erwärmter Gasfüllungen, dem dann folgenden Entfernen überflüssiger Druckfarbe und schließlich dem Übertrag von Druckfarbe aus Öffnungen der Druckform auf den Bedruckstoff. Der Über-/Austrag kann hierbei durch Erwärmung von Gasfüllungen in Hohlräumen unterstützt werden.After transferring or discharging printing ink onto the substrate by cooling the cavities to ensure that the gas temperatures in the Cavities are balanced. This serves as preparation for a new one Print cycle. A printing cycle consists of heating the Gas fillings of selected cavities, then covering the Openings with printing ink, the subsequent cooling of heated gas fillings, the subsequent removal of unnecessary ink and finally transferring ink from openings in the printing form the substrate. The transfer / discharge can be done by heating gas fillings be supported in cavities.
Der Druck eines Musters kann alternativ auch dadurch erfolgen, dass zunächst Öffnungen in der Druckform in der oben beschriebenen Weise mit Druckfarbe gefüllt werden, und das Muster auf den Bedruckstoff dadurch entsteht, dass nur ausgewählte Hohlräume erwärmt werden und nur Druckfarbe aus den hierzu gehörenden Öffnungen gegebenenfalls in unterschiedlichen Mengen - aufgrund unterschiedlicher Erwärmung - dann auf den Bedruckstoff gelangt. Ein auf dieser Weise ausgeführter Druck setzt voraus, dass ohne die Erwärmung von Gasfüllungen in Hohlräumen keine Druckfarbe auf den Bedruckstoff gelangen kann. Dies bedeutet, dass Druckfarbe nur in den Öffnungen vorhanden sein darf.Alternatively, a pattern can also be printed by first Openings in the printing form in the manner described above with printing ink be filled, and the pattern on the substrate is created in that only selected cavities are heated and only printing ink from the related openings, if necessary, in different quantities - due to different heating - then gets onto the substrate. A print made in this way presupposes that without the Heating of gas fillings in cavities no printing ink on the substrate can reach. This means that ink is only in the openings may be present.
Alternativ zu der vorstehend beschriebenen Variante der Druckerzeugung in den Hohlräumen durch Erwärmung und Abkühlung der Gasfüllung im Hohlraum kann eine Druckänderung im Hohlraum nach dem Abdecken der Öffnung des Hohlraumes mit Druckfarbe durch eine Volumenveränderung des Hohlraumes erfolgen. Die Volumenveränderung im Hohlraum kann durch einen verformbaren und/oder bewegbaren Wandbereich (z.B. durch Kolben oder Membran) erreicht werden. Eine Volumenvergrößerung des Hohlraumes nach dem Abdecken mit Druckfarbe führt zu einer Druckabsenkung im Hohlraum. Hierdurch wird Druckfarbe angesaugt. Eine Druckerhöhung im Hohlraum wird durch eine Volumenverringerung erreicht. Die Druckerhöhung im Hohlraum kann den Farbübertrag von der Druckform auf den Bedruckstoff unterstützen.As an alternative to the variant of pressure generation described in the cavities by heating and cooling the gas filling in the cavity there may be a pressure change in the cavity after covering the opening the cavity with ink by changing the volume of the cavity respectively. The change in volume in the cavity can be caused by a deformable and / or movable wall area (e.g. by pistons or Membrane) can be reached. An increase in volume of the cavity after covering with printing ink leads to a reduction in pressure in the cavity. This draws in ink. A pressure increase in the cavity will achieved by reducing the volume. The pressure increase in the cavity can support the ink transfer from the printing form to the substrate.
Die Unterdruck-Erzeugungsvorrichtung ist zweckmäßigerweise durch einen verformbaren und/oder bewegbaren Wandbereich des Hohlraumes ausgebildet, wobei der Wandbereich in eine erste Position vorgespannt und aus dieser heraus mittels eines Stellgliedes in eine zweite Position überführbar ist und das Volumen des Hohlraumes in der ersten Position des Wandbereichs größer ist als in der zweiten Position. Diese Vorrichtung kann auch zum Ausbringen bzw. zum Unterstützen des Ausbringens der Druckfarbe aus dem Hohlraum benutzt werden, indem über den Wandbereich das Volumen des Hohiraums verringert wird.The vacuum generating device is expediently by a deformable and / or movable wall area of the cavity, wherein the wall area is biased into and out of a first position out can be transferred into a second position by means of an actuator and that Volume of the cavity is larger in the first position of the wall area than in the second position. This device can also be used for spreading or used to aid in ink delivery from the cavity are reduced by reducing the volume of the cavity over the wall area becomes.
Allgemein ist also die Erfindung in einer Druckform zu sehen, die versehen ist mit
- einem Körper mit einer Oberfläche, die eine Vielzahl von Öffnungen aufweist,
- eine Vielzahl von Hohlräumen in dem Körper, die in den Öffnungen der Oberfläche des Körpers enden und Gas enthalten, und
- jedem Hohlraum zugeordneten Einrichtungen zum Erzeugen eines Unterdrucks in dem betreffenden Hohlraum,
- wobei
- durch Erzeugung eines Unterdrucks in einem Hohlraum nach dem Bedecken der Öffnung des Hohlraums mit einer Druckfarbe diese in den öffnungsnahen Bereich des Hohlraumes ansaugbar ist.
- a body with a surface that has a plurality of openings,
- a plurality of voids in the body that end in the openings in the surface of the body and contain gas, and
- means associated with each cavity for generating a negative pressure in the cavity in question,
- in which
- by generating a negative pressure in a cavity after the opening of the cavity has been covered with a printing ink which can be sucked into the region of the cavity near the opening.
Wie bereits oben erwähnt, ist es zweckmäßig, den Unterdruck durch Veränderung der Temperatur des Gases eines Hohlraumes zu erzeugen. Die Einrichtung zur Erzeugung eines Unterdrucks in einem Hohlraum weist also zweckmäßigerweise eine Abkühleinrichtung zum Abkühlen und/oder Abkühlen lassen des Gases in dem Hohlraum auf, so dass durch Abkühlen und/oder Abkühlen lassen des Gases in einem Hohlraum bei mit Druckfarbe überdeckter Öffnung des Hohlraumes das Gas in diesem einem Druckfarbe in den Hohlraum ansaugenden Unterdruck aussetzbar ist.As already mentioned above, it is advisable to change the negative pressure the temperature of the gas in a cavity. The facility expediently to generate a negative pressure in a cavity leave a cooling device for cooling and / or cooling of the gas in the cavity so that by cooling and / or cooling leave the gas in a cavity with the opening covered with ink of the cavity, the gas in a printing ink sucking into the cavity Vacuum is exposed.
Sofern der Unterdruck durch vorheriges Erwärmen des Gases eines Hohlraumes und anschließender Abkühlung (bei durch Druckfarbe abgedeckter Hohlraum-Öffnung) erzeugt wird, ist die hierfür erforderliche Heizung beispielsweise als Widerstandsheizelement ausgebildet. Die Heizung befindet sich in dem Hohlraum oder in thermischem Kontakt mit diesem bzw. dessen Wandung. Alternativ kann die Heizung in einem Hohlraum als ein sich durch Absorption elektromagnetischer Strahlung erwärmendes Heizelement ausgebildet sein, wobei dieses Absorptions-Heizelement insbesondere ein Metalloxid aufweist.If the negative pressure is caused by pre-heating the gas in a cavity and subsequent cooling (with cavity opening covered by printing ink) is generated, the heating required for this is for example designed as a resistance heating element. The heating is in the cavity or in thermal contact with it or its wall. Alternatively, the heater can be in a cavity as a result of absorption Heating element heating electromagnetic radiation be, this absorption heating element in particular a metal oxide having.
Schließlich ist es auch möglich, dass die Heizung durch eine Energiequelle realisiert ist, deren Energie induktiv, kapazitiv oder resistiv in Gasvolumina in den Hohlräumen eingekoppelt wird, oder dass die Energiequelle elektromagnetische Strahlung aussendet, die durch Gasvolumina in den Hohlräumen absorbiert wird. Finally, it is also possible for the heating to be implemented using an energy source is whose energy is inductive, capacitive or resistive in gas volumes in the Cavities is injected, or that the energy source is electromagnetic Emits radiation that is absorbed by gas volumes in the cavities becomes.
Bei dem erfindungsgemäßen Verfahren wird also
- die Druckfarbe in den Öffnungen der Oberfläche der Druckform mündende Hohlräume gesaugt, wobei sich die Druckfarbe innerhalb der Öffnungen und dem öffnungsnahen Bereichen der Hohlräume befindet, und
- die Druckfarbe aus den Hohlräumen heraus auf den Bedruckstoff ausgetragen.
- the printing ink is sucked into cavities opening into the openings of the surface of the printing form, the printing ink being located within the openings and the regions of the cavities close to the opening, and
- the ink is discharged from the cavities onto the substrate.
Umgekehrt kann durch Aufbringen eines Überdrucks zuvor in den Hohlraum angesaugte Druckfarbe aus dem Hohlraum auf den Bedruckstoff ausgetragen werden bzw. die Austragung unterstützt werden.Conversely, by applying an overpressure to the cavity beforehand sucked ink from the cavity on the substrate will be supported or the event will be supported.
Vorteilhafterweise ist vorgesehen, dass Druckfarbe in die Öffnungen und in die öffnungsnahen Bereiche sämtlicher Hohlräume einer Gruppe von Hohlräumen gesaugt wird und dass der Austrag durch selektives Aufbringen eines Überdrucks innerhalb ausgewählter Hohlräume dieser Gruppe von Hohlräumen erfolgt. Bei den hier angesprochenen Gruppen von Hohlräumen handelt es sich beispielsweise um eine oder mehrere Reihen von nebeneinander oder übereinander angeordneten Hohlräumen auf der Oberfläche der Druckform. Während bei dieser Variante sämtliche Hohlräume einer Gruppe mit Druckfarbe versehen werden, um dann durch selektive Ansteuerung der Hohlräume selektiv zu drucken, ist bei einer Variante dieses Vorgehens vorgesehen, dass die Druckfarbe in die Öffnungen und in die öffnungsnahen Bereiche ausgewählter Hohlräume einer Gruppe von Hohlräumen gesaugt wird und ferner insbesondere dass der Austrag der Druckfarbe aus selektiv Druckfarbe aufweisenden Hohlräumen einer Gruppe von Hohiräumen durch Überdruck in sämtlichen Hohlräumen einer Gruppe von Hohlräumen erfolgt.It is advantageously provided that printing ink in the openings and in the Areas close to the opening of all cavities in a group of cavities is sucked and that the discharge by selective application of an overpressure within selected cavities of this group of cavities. The groups of cavities addressed here are for example by one or more rows of side by side or one above the other arranged cavities on the surface of the printing form. While In this variant, all the cavities in a group are provided with printing ink to then selectively by selective control of the cavities print, in a variant of this procedure it is provided that the printing ink into the openings and into the areas of selected cavities close to the opening a group of cavities is sucked and further in particular that the discharge of the printing ink from selectively printing cavities a group of cavities by overpressure in all cavities a group of cavities.
Nachfolgend wird die Erfindung anhand der Zeichnung näher erläutert. Im einzelnen zeigen:
- Fign. 1 und 2
- zwei Ausführungsbeispiele der Oberfläche einer Druckform,
- Fig. 3
- eine teilweise aufgebrochen dargestellte Ansicht der Druckform,
- Fig. 4
- eine alternative Ausgestaltung einer Druckform im Längsschnitt und
- Fign. 5
bis 9 - grafisch beschreibend, die Gegebenheiten in dem Bereich eines Hohlraumes und dessen Öffnung während der einzelnen Schritte eines Druckzyklus.
- FIGS. 1 and 2
- two embodiments of the surface of a printing form,
- Fig. 3
- a partially broken away view of the printing form,
- Fig. 4
- an alternative embodiment of a printing form in longitudinal section and
- FIGS. 5 to 9
- graphically describing the conditions in the area of a cavity and its opening during the individual steps of a printing cycle.
In Fig. 1 ist ein Ausführungsbeispiel für eine ebene und in Fig. 2 eine gekrümmte
Druckform dargestellt. Der gekrümmte Teil einer Druckform kann
auch Teil einer Druckform in Form eines Hohlzylinders sein. Die Druckform ist
gekennzeichnet durch ein Raster von Öffnungen 1, eingebracht in einer ebenen
oder gekrümmten Platte, oder auf der Außenseite eines Hohlzylinders.
Hinter den Öffnungen 1 sind jeweils Hohlräume 2 angeordnet. Jeder Hohlraum
2 hat nur die Öffnung 1, ist also lediglich zur Oberfläche der Druckform hin
offen. In die Öffnungen kann Druckfarbe angesaugt werden. Jeweils eine Seite
der Hohlräume 2 wird durch einen Stopfen 3 aus einem gut wärmeleitenden
Werkstoff gebildet. Die Wärmeleitung durch den Stopfen 3 sorgt dafür, dass
thermische Energie im Stopfen3, aufgebracht z.B. durch die Absorption von
Laserlicht, durch Wärmeleitung auf die Gasfüllung im Hohlraum 2 übertragen
wird. Die Einstrahlung des Laserlichts erfolgt in Mulden 4 die jeweils einzelnen
Öffnungen zugeordnet sind. Zur Kühlung der Gasfüllungen kann ein Gasstrahl
auf die Mulden gerichtet werden. Die einzelnen Öffnungen1, Hohlräume 2,
Stopfen 3 und Mulden 4 sind in einer Matrix 5 eingebettet, die für die
notwendige thermische Isolierung zwischen verschiedenen Öffnungen 1,
Hohlräumen 2, Stopfen 3 und Mulden 4 sorgt.In Fig. 1 is an embodiment for a flat and in Fig. 2 a curved
Print form shown. The curved part of a printing form can
also be part of a printing form in the form of a hollow cylinder. The printing form is
characterized by a grid of
In Fig. 3 ist ein Ausführungsbeispiel einer Druckvorrichtung dargestellt. Die
Druckform 6 ist in diesem Beispiel ein Hohlzylinder entsprechend Fig. 2, mit
den Öffnungen 1 für den Farbeintrag auf der Außenseite des Hohlzylinders. In Fig. 3 an embodiment of a printing device is shown. The
In this example,
Heizbalken 7 und Kühlbalken 8 sind auf der Innenseite des Hohlzylinders angeordnet.
Sie erstrecken sich über die volle Länge der Druckform 6, und ermöglichen
ein Heizen und Kühlen von Hohlräumen der Druckform 6. Die
Druckform rotiert um eine mit einem Rahmen 9 verbundene Achse 10. Heizbalken
7 und Kühlbalken 8 sind mit einem Rahmen 9 verbunden. Der Heizbalken
7 hat die Aufgabe, Hohlräume 2 in der Druckform 6 entsprechend dem zu
druckenden Muster zu beheizen, wobei in dieser Ausführung immer nur ein
streifenförmiger Bereich der Druckform 6 unter dem Heizbalken 7 liegt. Der
Heizbalken 7 enthält Vorrichtungen, welche Laserlicht entsprechend dem zu
druckenden Muster in Mulden 4 lenken. In einer Mulde 4 wird Laserlicht absorbiert
und in thermische Energie umgewandelt, und letztlich hierdurch eine
Gasfüllung erwärmt. Das Laserlicht wird von einem extern angeordneten Laser
11 über Lichtleitfasern 12 in den Heizbalken 7 gelenkt. Steuersignale zur Ablenkung
des Laserlichts in die einzelnen Mulden der Druckform werden in
einem externen Gerät 13 aufbereitet und über ein Kabel 14 in den Heizbalken
7 geleitet. Die Druckform 6 bewegt sich infolge ihrer Rotation um die Achse 10
am Heizbalken 7 vorbei. Nach dem Durchgang von Hohlräumen 2 am Heizbalken
7 vorbei werden die zugehörigen Öffnungen 1 mit Druckfarbe 15 bedeckt,
in dem die äußere Oberfläche der Druckform in Druckfarbe 15 eingetaucht
wird. Die Druckfarbe 15 befindet sich in einer Wanne 16 unter der Druckform
6. Gleichzeitig mit dem Eintauchen und Bedecken von Öffnungen werden
Hohlräume durch den Kühlbalken 8 gekühlt. Der Kühlbalken 8 überdeckt einen
Streifen der Druckform 6, und die Kühlung erfolgt über einen Gasstrom, der in
die am Kühlbalken 8 vorbei bewegten Mulden 4 gelenkt wird. Die Kühlluft wird
dem Kühlbalken 8 über eine Schlauchleitung 17 zugeführt. Durch die Kühlung
verringert sich der Gasdruck in den vorher beheizten Hohlräumen, hierdurch
wird Druckfarbe in Öffnungen gedrückt.
Die Hohlräume können unterschiedlich stark geheizt werden, hierdurch werden vorteilhaft unterschiedliche Mengen an Druckfarbe in die entsprechenden Öffnungen gedrückt. The cavities can be heated to different degrees, this way advantageously different amounts of printing ink in the corresponding Openings pressed.
Eine Messerrakel 18 streift überschüssige Farbe von der Druckform 6 ab, bevor
die Druckform 6 mit dem Bedruckstoff 19 in Kontakt gebracht wird, und
Druckfarbe aus den Öffnungen 1 auf den Bedruckstoff 19 gelangt. Die Walze
20 drückt den Bedruckstoff 19 gegen die Druckform 6. Durch die Walzen 21
wird der Bedruckstoff 19 geführt. Mit dem Heizbalken 22, der sich über die gesamte
Breite der Druckform 6 erstreckt, werden die Gasfüllungen in den
Hohlräumen der Druckform 6 gegenüber der Walze 20 erwärmt. Hierdurch
wird der Übertrag der Druckfarbe aus den Öffnungen 1 der Druckform 6 auf
den Bedruckstoff 19 unterstützt. Eine Zuleitung 23 versorgt den Heizbalken 22
mit der notwendigen Energie.A
Gemäß einem weiteren Ausführungsbeispiel (siehe Fig. 4) ist die Druckform als ein dünnwandiges Rohr ausgebildet, in welches die Hohlräume und Öffnungen eingearbeitet sind. Insbesondere bei breiten Druckformaten, ergibt sich dann die Aufgabe, die Druckform mechanisch für den Druckvorgang zu stabilisieren. Die Druckform kann hierzu an den Rohrenden mit Spannelementen verbunden sein, die parallel zur Rohrachse eine Zugspannung auf die Druckform ausüben und so die Druckform ausrichten und mechanisch stabilisieren. Besonders vorteilhaft kann eine dünnwandige Druckform durch ein Gaskissen mechanisch stabilisiert werden.According to a further exemplary embodiment (see FIG. 4), the printing form is as a thin-walled tube is formed, in which the cavities and openings are incorporated. This results in particular in the case of wide print formats the task of mechanically stabilizing the printing form for the printing process. The printing form can be connected to the tube ends with clamping elements be that exert a tensile stress on the printing form parallel to the tube axis and thus align and mechanically stabilize the printing form. Especially A thin-walled printing form can advantageously be mechanically provided by a gas cushion be stabilized.
In Fig. 4 ist eine rohrförmige, dünnwandige Druckform 6 dargestellt, die an
den Enden mit Spannelementen 24 verbunden ist. Druckform 6 und Spannelemente
24 sind über einen Dorn 25 geschoben. Der Dorn 25 ist fest mit
einem Rahmen 9 verbunden. Spannelemente 24 und Druckform 6 sind um den
Dorn 25 drehbar angeordnet, und werden durch Lager 28 geführt. Mit Hilfe
einer Spannschraube 29 kann eine Zugspannung auf die Druckform 6 ausgeübt
werden, welche die Druckform 6 ausrichtet und mechanisch stabilisiert.
Zusätzlich kann die Druckform 6 durch ein Gaskissen zwischen der Druckform
6 und der gegenüberliegenden Oberfläche des Dorns 25 mechanisch stabilisiert
werden. Das Gaskissen wird in einem schmalen Spalt zwischen der Druckform
6 und der äußeren Oberfläche des Dorns 25 durch Druckgas gebildet. Durch
das Gaskissen kann die Druckform 6 senkrecht zur Oberfläche, und in Richtung
auf die Drehachse, durch Druck belastet werden, ohne dass die Druckform 6
den Dorn 25 berührt. Der Druck wird durch das Gaskissen auf den Dorn 25
übertragen. Aus feinen Düsenöffnungen 30, verteilt über die äußere
Oberfläche des Dorns 25, wird Gas für das Luftkissen in den Spalt gedrückt.
Ein Versorgungskanal 31 führt Druckgas zu den Düsenöffnungen 30. Durch die
Zuführung von Druckgas in das Gaskissen, wird gleichzeitig auch eine für das
Druckverfahren vorteilhaft Kühlung der Druckform erreicht, da es für den
Druckvorgang vorteilhaft ist, wenn neben dem Erwärmen auch ein Abkühlen
der Gasfüllungen in den Hohlräumen erfolgt.In Fig. 4, a tubular, thin-
In den Dorn 25 können die für das Druckverfahren benötigten Heiz- und Kühlvorrichtungen
eingebaut sein. In Fig. 4 ist ein Heizbalken 7 mit einer Lichtleitfaser
12 eingezeichnet.In the
Nachfolgend wird zur grafischen Veranschaulichung der Vorgänge zum Ansaugen und Ausstoßen von Druckfarbe in die Hohlräume bzw. aus den Hohlräumen Bezug genommen auf die Fign. 5 bis 9, die die unterschiedlichen Phasen eines Druckzyklus anhand eines Hohlraumes zeigen.The following is a graphic illustration of the suction processes and ejecting ink into the cavities With reference to FIGS. 5 to 9, the different phases show a print cycle using a cavity.
Ein Druckzyklus setzt sich zusammen aus dem Erwärmen der Gasfüllungen (Fig. 5) ausgewählter Hohlräume - in diesem Fall mittels einer Widerstandsheizung 32 -, einem anschließenden Abdecken der Öffnungen mit Druckfarbe (Fig. 6), dem nachfolgenden Abkühlen erwärmter Gasfüllungen (Fig. 7), dem dann folgenden Entfernen überflüssiger Druckfarbe (Fig. 8) und schließlich dem Übertrag von Druckfarbe aus Öffnungen der Druckform auf den Bedruckstoff (Fig 9). Der Über-/Austrag kann hierbei durch Erwärmung von Gasfüllungen in Hohlräumen unterstützt werden. A pressure cycle consists of heating the gas fillings (Fig. 5) selected cavities - in this case by means of a resistance heater 32 -, then covering the openings with printing ink (Fig. 6), the subsequent cooling of heated gas fillings (Fig. 7), the then subsequent removal of unnecessary ink (Fig. 8) and finally the transfer of printing ink from openings in the printing form to the substrate (Fig 9). The transfer / discharge can be done by heating gas fillings be supported in cavities.
Kasein-Emulsionsfarbe (schwarze Plaka-Farbe der Firma Pelikan) verdünnt mit Wasser im Verhältnis ein Volumenteil Farbe mit zwei Volumenteilen Wasser kann als Druckfarbe verwendet werden. Eine erfindungsgemäße Druckform zum Drucken mit dieser Druckfarbe besteht aus einer quadratischen, 10 mm dicken Platte aus Teflon. Die Kantenlänge der Platte beträgt 50 mm. Senkrecht zur Oberfläche sind in die Teflon-Platte gleichartige Durchgangsbohrungen eingebracht. Bis zu einer Bohrtiefe von einem Millimeter haben die Durchgangsbohrungen einen Durchmesser von 0,4 mm. Danach weitet sich der Bohrungsdurchmesser von 0,4 mm auf den Durchmesser 0,9 mm. Die Bohrungen in der Platte bilden ein Raster mit einer hexagonalen Struktur. Zwischen den Rasterpunkten besteht ein Abstand von 2 mm. In die Öffnungen der Durchgangsbohrungen mit den größeren Durchmessern sind Glasröhren eingeschoben. Ein Ende der einzelnen Glasröhren ist jeweils verschlossen, und die Glasröhren wurden mit dem offenen Ende voran eingeschoben. Die Glasröhren sind 15 mm lang, haben einen Außendurchmesser von 0,9 mm und einen Innendurchmesser von 0,4 mm, sie wurden 9 mm tief in die Bohrungen eingeschoben. Der Spalt zwischen Glasrohr und Teflon wurde mit Epoxidharzklebstoff gasdicht abgedichtet. Ein Ende der Glasröhren wurde jeweils durch einen Tropfen Epoxidharzklebstoff gasdicht verschlossen. Der Klebstoff ist 2 mm tief in die Glasröhren eingepresst, und umschließt pro Glasrohr jeweils zwei 0,1 mm dicke Kupferdrähte, die sich nicht berühren und 3 mm tief in die einzelnen Glasröhren eingeschoben sind, so dass sie die Klebstoffschicht im Inneren der Glasröhre durchstoßen. Die beiden Kupferdrähte sind im Glasrohr mit einem 20 mm langen dünnen Draht aus Konstantan elektrisch verbunden. Der ohmsche Widerstand der Brücke aus Konstantan-Draht beträgt 4 Ω. Die Konstantan-Drähte befinden sich jeweils vollständig in den Glasröhren. Ein elektrischer Strom, der von außen über die Kupferdrähte durch die Konstantan-Brücke fließt, erhitzt den Draht und führt zu einer Erwärmung der Gasfüllung im Glasrohr. Der Hohlraum im Glasrohr und das Volumen des 1 mm langen Teils der Durchgangsbohrung mit 0,4 mm Durchmesser im Teflon, bilden einen erfindungsgemäßen Hohlraum in der Druckform, mit der 0,4 mm Bohrung in der Teflonplatte als Öffnung. Teflon wird durch die verdünnte Kasein-Emulsionsfarbe nicht benetzt.Casein emulsion paint (black plaka paint from Pelikan) diluted with Water in the ratio of one volume of paint to two volumes of water can be used as printing ink. A printing form according to the invention for printing with this printing ink consists of a square, 10 mm thick plate made of Teflon. The edge length of the plate is 50 mm. Perpendicular through holes of the same type are drilled into the surface of the Teflon plate. The through holes have a drilling depth of up to one millimeter a diameter of 0.4 mm. The bore diameter then widens from 0.4 mm to a diameter of 0.9 mm. The holes in the Plate form a grid with a hexagonal structure. Between There is a grid spacing of 2 mm. In the openings of the through holes with the larger diameters, glass tubes are inserted. One end of each glass tube is closed, and the Glass tubes were inserted with the open end first. The glass tubes are 15 mm long, have an outer diameter of 0.9 mm and a Inner diameter of 0.4 mm, they were inserted 9 mm deep into the holes. The gap between the glass tube and Teflon was covered with epoxy resin adhesive sealed gastight. One end of each of the glass tubes was sealed gas-tight with a drop of epoxy resin adhesive. The adhesive is pressed 2 mm deep into the glass tubes and encloses each glass tube two 0.1 mm thick copper wires that do not touch and 3 mm deep are inserted into the individual glass tubes so that they cover the adhesive layer pierce inside the glass tube. The two copper wires are in the glass tube electrically connected with a 20 mm long thin wire made of constantan. The ohmic resistance of the constantan wire bridge is 4 Ω. The constantan wires are all completely in the glass tubes. An electrical current flowing from the outside over the copper wires through the Constantan Bridge flows, heats the wire and heats up the Gas filling in the glass tube. The cavity in the glass tube and the volume of 1 mm long part of the through hole with 0.4 mm diameter in Teflon a cavity according to the invention in the printing form, with the 0.4 mm Hole in the Teflon plate as an opening. Teflon is thinned out by the diluted casein emulsion paint not wetted.
Für den Druckvorgang werden die Gasfüllungen der Hohlräume erwärmt, deren zugehörige Öffnungen Druckfarbe ansaugen sollen. Dies geschieht mit einer elektrischen Spannung von 1,2 Volt mit der die Widerstandsheizungen der ausgewählten Hohlräume 0,5 Sekunden lang versorgt werden. Die Öffnungen der Druckform werden 0,1 Sekunden bevor die Stromversorgungen für die Widerstandsheizungen abgestellt werden durch einen Schwall aus Druckfarbe mit Druckfarbe bedeckt. Zwei Sekunden später, wenn die Gastemperatur in den durch die Widerstandsheizung erwärmten Gasfüllungen nahezu wieder Umgebungstemperatur erreicht hat, kann die Druckfarbe mit einer Gummi-Rakel von der Oberfläche der Druckform gewischt werden. Druckfarbe wurde nur von den Öffnungen mit erwärmten Gasfüllungen angesaugt. Zum Druck auf den Bedruckstoff, wird die Druckform auf den Bedruckstoff aufgesetzt. Anschließend werden 0,5 Sekunden lang, die Widerstandsheizungen aller Hohlräume mit einer elektrischen Spannung von 1,2 Volt versorgt. Hierdurch werden die Gasfüllungen in den Hohlräumen erwärmt, wodurch Druckfarbe aus den mit Druckfarbe gefüllten Öffnungen der Druckform durch den Gasdruck im Hohlraum auf den Bedruckstoff gedrückt wird.For the printing process, the gas fillings in the cavities are heated, the associated openings of which are intended to draw in ink. This happens with an electrical voltage of 1.2 volts with which the resistance heaters of the selected cavities for 0.5 seconds. The openings The printing form will be 0.1 seconds before the power supplies for the Resistance heaters are turned off by a surge of printing ink covered with ink. Two seconds later when the gas temperature is in the gas fillings warmed up by the resistance heating almost again Has reached ambient temperature, the ink can be coated with a rubber squeegee be wiped off the surface of the printing form. Printing ink was only sucked in from the openings with heated gas fillings. For printing on the substrate, the printing form is placed on the substrate. Then the resistance heaters of all Cavities supplied with an electrical voltage of 1.2 volts. hereby the gas fillings in the cavities are heated, causing printing ink to come out the openings of the printing form filled with printing ink by the gas pressure in the Cavity is pressed onto the substrate.
Claims (47)
- Printing form for transferring a fluid printing ink onto a printing material to be printed, witha body with a surface having a plurality of openings,a plurality of cavities that are formed in the body, end in the openings on the surface of the body, and contain a gas, anddevices associated with each cavity for generating a vacuum in the respective cavity,whereinprinting ink can be sucked into the region close to the opening of the cavity by generating a vacuum in a cavity after the opening of the cavity has been covered with a printing ink.
- Printing form according to claim 1, characterized in that the device for generating a vacuum in a cavity comprises a cooling device for cooling the gas in the cavity and/or allowing said gas to cool, wherein due to the cooling of said gas in a cavity and/or allowing said gas in a cavity to cool, a vacuum is applicable to the gas in said cavity for sucking printing ink into said cavity when the opening of said cavity is covered with printing ink.
- Printing form according to claim I or 2, characterized in that the device for generating a vacuum in a cavity comprises a heater for heating the gas in the cavity, wherein due to a previous heating of the gas in the cavity and by subsequently cooling said gas and/or allowing said gas in the cavity to cool, a vacuum is applicable to the gas in said cavity for sucking printing ink into said cavity when the opening of said cavity is covered with printing ink.
- Printing form according to claim 3, characterized in that the heater in a cavity is embodied as a resistance heating element.
- Printing form according to claim 3, characterized in that the heater in a cavity is embodied as a heating element heatable by absorption of electromagnetic radiation, the heating element in particular comprising a metal oxide.
- Printing form according to one of claims 1 to 4, characterized in that the device for generating a vacuum in the cavities comprises an inductive, capacitive or resistive coupling of energy into gas volumes in the cavities or the absorption of electromagnetic radiation by gas volumes in the cavities.
- Printing form according to claim 1, characterized in that the device for generating a vacuum in a cavity comprises at least one deformable and/or movable wall area for changing the volume of the cavity and that by deforming and/or moving the wall area in order to increase the volume of the cavity the gas in said cavity a vacuum is applicable to the gas in said cavity for sucking printing ink into said cavity when the opening of said cavity is covered with printing ink.
- Printing form according to claim 7, characterized in that the deformable and/or movable wall area of the cavity is pre-tensioned into a first position and is movable from the first position into a second position by means of an actuator, the volume of the cavity in the first position being grater than in the second position.
- Printing form according to one of claims 1 to 8, characterized in that the energy for generating the vacuum in a cavity is receivable by the devices for generating a vacuum in the cavities of the body by capacitive and/or inductive coupling and/or by electromagnetic radiation.
- Printing form according to one of claims 1 to 9, characterized by devices associated with the cavities for expelling printing ink from a cavity onto a printing material or for assisting the expelling of printing ink form a cavity onto a printing material.
- Printing form according to claim 10, characterized in that the devices for expelling the printing ink onto a printing material or for assisting the expelling of a printing ink onto a printing material and the devices for generating a vacuum in the cavities comprise common elements arranged on the body.
- Printing form according to claim 10 or 11, characterized in that printing ink is expellable from the cavity exclusively or partially by generating a positive pressure in the cavity.
- Printing form according to claim 12, characterized in that printing ink is expellable from a cavity exclusively or partially by deforming and/or moving the wall area for reducing the volume.
- Printing form according to claim 12, characterized in that printing ink is expellable from the cavity exclusively or partially by heating the gas in the cavity.
- Printing form according to one of claims 1 to 14, characterized in that the devices for generating vacuums in the cavities are operatable to provide vacuums of different strengths in order to suck in different quantities of printing ink.
- Printing form according to one of claims 10 to 15, characterized in that the devices for expelling printing ink from the cavities and/or for assisting in expelling printing ink from the cavities are operatable differently to expel different amounts of printing ink.
- Printing form according to claim 15 and 16, characterized in that the devices for expelling printing ink from the cavities or for assisting in expelling ink from the cavities are operatable according to the preceding operation of the devices for generating the vacuums in the cavities.
- Printing form according to one of claims 1 to 17, characterized in that the gas in the cavities is air.
- Printing form for transferring a fluid printing ink onto a printing material to be printed, witha body with a surface having a plurality of openings, a plurality of cavities in the body that end in the openings of the surface of the body and contain a gas, andwith heaters associated with the cavities for heating the gas in the cavities,wherein after heating of the gas in a cavity and after covering the opening of the cavity with printing ink and after subsequent cooling of the gas in the cavity and/or allowing said gas in the cavity to cool, printing ink can be sucked into the region close to the opening of the cavity.
- Printing form according to claim 19, characterized in that the heater in a cavity is embodied as a resistance heating element.
- Printing form according to claim 19, characterized in that the heater in a cavity is embodied as a heating element heatable by absorption of electromagnetic radiation, the heating element in particular comprising a metal oxide.
- Printing form according to one of claims 19 to 21, characterized in that the energy for generating the vacuum in a cavity is receivable by the devices for generating a vacuum in the cavities of the body and/or by a gas volume in the cavity by capacitive and/or inductive coupling and/or by electromagnetic radiation.
- Printing form according to one of claims 19 to 22, characterized by devices associated with the cavities for expelling printing ink from a cavity onto a printing material or for assisting the expelling of printing ink form a cavity onto a printing material.
- Printing form according to claim 23, characterized in that the devices for expelling the printing ink onto a printing material or for assisting the expelling of a printing ink onto a printing material and the devices for generating a vacuum in the cavities comprises common elements arranged on the body.
- Printing form according to claim 24, characterized in that the printing ink is expellable from a cavity exclusively or partially by heating the gas in the cavity.
- Printing form according to one of claims 19 to 25, characterized in that the devices for generating vacuums in the cavities are operatable to provide vacuums of different strengths in order to suck in different quantities of printing ink.
- Printing form according to one of claims 23 to 26, characterized in that the devices for expelling printing ink from the cavities or for assisting in expelling printing ink from the cavities are operatable differently to expel different amounts of printing ink.
- Printing form according to claim 26 and 27, characterized in that the devices for expelling printing ink from the cavities or for assisting in expelling ink from the cavities are operatable according to the preceding operation of the devices for generating the vacuums in the cavities.
- Printing form according to one of claims 19 to 28, characterized in that the gas in the cavities is air.
- Device for transferring a fluid ink from a printing form onto a printing material, witha transport device for transporting printing material to be printed along a transport path, anda printing form having a surface past which the printing material is movable,that the printing form is embodied according to one or more of claims 1 to 29.
- Method for transferring a fluid printing ink from a printing form onto a printing material, whereinthe printing ink is sucked into cavities ending in the openings of the surface of the printing form, the printing ink being located within the openings and the regions close to the openings of the cavities, andthe printing ink is expelled from the cavities onto the printing material,
- Method according to claim 31, characterized in that the printing ink is expelled from the cavities onto the printing material by applying a positive pressure.
- Method according to claim 31, characterized in that the printing ink is sucked into the openings and the regions close to the openings of all cavities of a group of openings and that the expelling is achieved by the selective application of a positive pressure to selected cavities of this group of cavities.
- Method according to claim 31, characterized in that the printing ink is sucked into the openings and regions close to the openings of selected cavities of a group of cavities.
- Method according to claim 32 and 34, characterized in that the expelling of the printing ink from the cavities of a group of cavities that selectively contain printing ink is achieved by a positive pressure in all cavities of a group of cavities.
- Method according to one of claims 31 to 35, characterized in that for sucking printing ink into a cavity, the opening of said cavity is covered with printing ink and subsequently a vacuum is generated in said cavity.
- Method according to claim 36, characterized in that the vacuum in a cavity is generated by cooling the gas volume of the cavity when the opening of the cavity is covered with printing ink.
- Method according to claim 36 or 37, characterized in that the gas volume of a cavity is heated before the opening of the cavity is covered with printing ink.
- Method according to claim 38, characterized in that a heater is used for the heating.
- Method according to claim 38, characterized in that the gas in the cavity is heated by inductively, capacitively or resistively coupling energy into the gas or by the absorption of electromagnetic radiation by the gas.
- Method according to claim 36, characterized in that the vacuum in a cavity is generated by increasing its volume.
- Method according to one of claims 31 to 39, characterized in that the expelling of printing ink from a cavity is achieved or at least assisted by the generation of a positive pressure in the respective cavity.
- Method according to claim 42, characterized in that the positive pressure is generated by heating the gas volume in the cavity when the opening of said cavity is covered with printing ink.
- Method according to claim 42, characterized in that the positive pressure is achieved by reducing the gas volume in the cavity when the opening of said cavity is covered by printing ink.
- Method according to one of claims 31 to 44, characterized in that the vacuum in the cavity is set at different values.
- Method according to one of claims 42 to 45, characterized in that the positive pressure in the cavity is set at different values.
- Method according to one of claims 31 to 46, characterized in that the cavities are filled with air.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
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DE19900046 | 1999-01-04 | ||
DE19900046 | 1999-01-04 | ||
PCT/EP1999/010478 WO2000040423A1 (en) | 1999-01-04 | 1999-12-31 | Method, device and printing mould for conveying free-flowing printing ink onto a printable substance |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1154905A1 EP1154905A1 (en) | 2001-11-21 |
EP1154905B1 true EP1154905B1 (en) | 2003-04-02 |
Family
ID=7893554
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP99964688A Expired - Lifetime EP1154905B1 (en) | 1999-01-04 | 1999-12-31 | Method, device and printing mould for conveying free-flowing printing ink onto a printable substance |
Country Status (6)
Country | Link |
---|---|
US (1) | US6651560B2 (en) |
EP (1) | EP1154905B1 (en) |
JP (1) | JP4384361B2 (en) |
AU (1) | AU3044400A (en) |
DE (1) | DE59904895D1 (en) |
WO (1) | WO2000040423A1 (en) |
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US7703394B2 (en) | 2005-05-23 | 2010-04-27 | Heidelberger Druckmaschinen Ag | Apparatus and method for the application of a liquid and printing unit and machine having the apparatus |
DE102013218961A1 (en) * | 2013-09-20 | 2015-03-26 | Dietmar Neuhaus | Apparatus and method for transferring flowable printing substances to a printing substrate |
DE102006022522B4 (en) * | 2005-05-23 | 2015-09-03 | Dietmar Neuhaus | Device for the application of a liquid |
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Publication number | Priority date | Publication date | Assignee | Title |
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JP4567917B2 (en) * | 2001-06-29 | 2010-10-27 | デュプロ精工株式会社 | Adhesive applicator |
US20040123751A1 (en) * | 2001-07-12 | 2004-07-01 | Ramon Vega | Multi-purpose printer device |
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1999
- 1999-12-31 WO PCT/EP1999/010478 patent/WO2000040423A1/en active IP Right Grant
- 1999-12-31 AU AU30444/00A patent/AU3044400A/en not_active Abandoned
- 1999-12-31 EP EP99964688A patent/EP1154905B1/en not_active Expired - Lifetime
- 1999-12-31 JP JP2000592154A patent/JP4384361B2/en not_active Expired - Lifetime
- 1999-12-31 DE DE59904895T patent/DE59904895D1/en not_active Expired - Lifetime
-
2001
- 2001-07-05 US US09/899,696 patent/US6651560B2/en not_active Expired - Lifetime
Cited By (4)
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US7703394B2 (en) | 2005-05-23 | 2010-04-27 | Heidelberger Druckmaschinen Ag | Apparatus and method for the application of a liquid and printing unit and machine having the apparatus |
CN1868743B (en) * | 2005-05-23 | 2010-05-12 | 海德堡印刷机械股份公司 | Liquid applying device, printing device, printed material processing machine and applying method |
DE102006022522B4 (en) * | 2005-05-23 | 2015-09-03 | Dietmar Neuhaus | Device for the application of a liquid |
DE102013218961A1 (en) * | 2013-09-20 | 2015-03-26 | Dietmar Neuhaus | Apparatus and method for transferring flowable printing substances to a printing substrate |
Also Published As
Publication number | Publication date |
---|---|
EP1154905A1 (en) | 2001-11-21 |
JP2002534291A (en) | 2002-10-15 |
DE59904895D1 (en) | 2003-05-08 |
WO2000040423A1 (en) | 2000-07-13 |
JP4384361B2 (en) | 2009-12-16 |
AU3044400A (en) | 2000-07-24 |
US6651560B2 (en) | 2003-11-25 |
US20020000190A1 (en) | 2002-01-03 |
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