EP0922590B1 - Ceramic printing form - Google Patents
Ceramic printing form Download PDFInfo
- Publication number
- EP0922590B1 EP0922590B1 EP98123560A EP98123560A EP0922590B1 EP 0922590 B1 EP0922590 B1 EP 0922590B1 EP 98123560 A EP98123560 A EP 98123560A EP 98123560 A EP98123560 A EP 98123560A EP 0922590 B1 EP0922590 B1 EP 0922590B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- printing forme
- printing
- depressions
- ceramic
- printing form
- 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
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41N—PRINTING PLATES OR FOILS; MATERIALS FOR SURFACES USED IN PRINTING MACHINES FOR PRINTING, INKING, DAMPING, OR THE LIKE; PREPARING SUCH SURFACES FOR USE AND CONSERVING THEM
- B41N1/00—Printing plates or foils; Materials therefor
- B41N1/006—Printing plates or foils; Materials therefor made entirely of inorganic materials other than natural stone or metals, e.g. ceramics, carbide materials, ferroelectric materials
Definitions
- the invention relates to a printing form according to the preamble of the first Claim.
- Printing forms of the type mentioned are used in particular in gravure printing processes used.
- the depressions in the printing form are made in a known manner Etching or engraving is mechanical removal, or more recently generated by laser processing.
- Engraving known from engravings and Etchings, is used for artistic purposes.
- Printing forms are in usually made of metal, such as copper or steel.
- the etching and the laser processing of the metal surfaces is used for the introduction of figurative representations and script used. These methods are suitable especially for industrial use and thus high print runs.
- the etching process has the disadvantage that used etching baths have to be carefully and expensive disposal.
- machining metal surfaces through Laser for the production of printing forms has proven to be disadvantageous in that by melting beyond the surface of the printing form Melting burrs arise which have to be removed afterwards. This subsequent processing is a cost factor. It will also make the Edges of the indentations out of focus.
- the object of the present invention is to present a printing form without the disadvantages listed above is simple and clean to manufacture and one has a long service life with constant print quality.
- a ceramic printing plate according to the invention has a long service life consistent print quality. It is particularly suitable for the production of Clichés.
- the ones required for the representations to be printed and the font As a rule, indentations can be made using all suitable for ceramics Manufacturing process.
- the sharp ones that arise during manufacture Contour edges ensure clean reproduction with sharp edges the representations and texts reproduced in print.
- the Grain diameter of the ceramic material is less than 10 microns.
- the grain diameter is below 5 ⁇ m. ever the smaller the grain diameter, the higher the possible bending strength of the material, the achievable surface quality and the contour accuracy.
- Laser treatment method can be used with which, for example Labeling of the ball heads of ceramic endoprostheses of the hip joint he follows. Through this labeling carried out by means of a controlled Readable depressions are created by the laser beam. This procedure for Marking the ball heads has already proven itself, but was not for used this inventive purpose. The removal of material from the wells is about 15 to 25 ⁇ m.
- the laser ablation process differs significantly from that the method known from EP 0 741 117 A1. There is a specially endowed Surface of a ceramic material treated with a laser beam so that this surface changes color. This will make the ceramic surface creates an image directly, but not from the surface of the ceramic reproduce. For this reason, laser treatment differs the ceramic surface from the above-mentioned script essentially from processing a ceramic surface for material removal.
- the surface of the printing form largely determines the print quality. Out for this reason, it is advantageous if the surface of the artwork is at least finely ground and has a roughness depth of around 0.5 ⁇ m lies. High sharpness of contours and good cleaning of the surfaces which the color is not intended for print reproduction is marked with a polished surface whose surface roughness Ra is less than 0.5 ⁇ m.
- the ceramic artwork can be plate-shaped as well be cylindrical. It offers the shape of the previously known Printing forms. All high-performance ceramics are suitable as a material. To include, for example, ceramics based on aluminum oxide or zirconium oxide. Silicon nitrides and carbides are also suitable as materials.
- the production a printing form according to the invention requires only one Machining process that involves using an environmentally friendly Procedure, without the need to dispose of environmentally hazardous Waste materials, can be carried out. In addition, there is no further post-processing required.
- the sharp-edged contour of the representations and the writing as well as the high one Quality and low roughness of the surface ensure that a cleaner Ink application to the medium to be printed, either directly or indirectly, is guaranteed.
- direct printing for example when applying on paper, is due to the low affinity of the color for the ceramic, a clean removal guaranteed the color from the printing form.
- indirect Printing process for example in the pad printing process. With these Printing process, the color is first transferred from the printing form to one Intermediate carrier, for example a rubber roller, and only then from this transfer the surface to be printed.
- the printing form 1 is a plate made of aluminum oxide, Al2O3.
- the wells 4 are on the recognizable broken lower right corner of printing form 1. Farther the sharp edges 5 of the contours of the depressions 4 can be seen.
- FIG. 2 shows a roller-shaped printing form 10. It rotates about an axis 11 by means of a drive, not shown here, to first change the color to a Intermediate carrier or transfer directly to the surface to be printed.
- the Surface 12 is also polished. 13 for printing the representations the depressions 14 filled with paint.
- the material of the present Roller-shaped printing form 10 can, for example, be made of zirconium oxide ceramic consist. It is particularly good with regard to the fatigue strength mechanical properties.
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Inorganic Chemistry (AREA)
- Manufacture Or Reproduction Of Printing Formes (AREA)
- Laser Beam Processing (AREA)
- Printing Plates And Materials Therefor (AREA)
Description
Die Erfindung betrifft eine Druckform entsprechend dem Oberbegriff des ersten Anspruchs.The invention relates to a printing form according to the preamble of the first Claim.
Druckformen der genannten Art werden insbesondere in Tiefdruckverfahren eingesetzt. Die Vertiefungen in der Druckform werden in bekannter Weise durch Ätzen oder Gravieren, das ist ein mechanischer Abtrag, oder neuerdings auch durch Laserbearbeitung, erzeugt. Das Gravieren, bekannt von Stichen und Radierungen, wird für künstlerische Zwecke eingesetzt. Druckformen werden in der Regel aus Metall, beispielsweise Kupfer oder Stahl, hergestellt. Das Ätzen und die Laserbearbeitung der Metalloberflächen wird zum Einbringen von figürlichen Darstellungen und Schrift eingesetzt. Diese Verfahren eignen sich insbesondere für den industriellen Einsatz und damit hohe Druckauflagen. Das Ätzverfahren weist den Nachteil auf, daß verbrauchte Ätzbäder einer sorgfältigen und teuren Entsorgung bedürfen. Bei der Bearbeitung von Metallflächen durch Laser zur Herstellung von Druckformen hat es sich als nachteilig erwiesen, daß durch das Aufschmelzen über die Oberfläche der Druckform hinausreichende Schmelzgrate entstehen, die nachträglich entfernt werden müssen. Diese nachträgliche Bearbeitung ist ein Kostenfaktor. Außerdem werden dadurch die Kanten der Vertiefungen unscharf.Printing forms of the type mentioned are used in particular in gravure printing processes used. The depressions in the printing form are made in a known manner Etching or engraving is mechanical removal, or more recently generated by laser processing. Engraving, known from engravings and Etchings, is used for artistic purposes. Printing forms are in usually made of metal, such as copper or steel. The etching and the laser processing of the metal surfaces is used for the introduction of figurative representations and script used. These methods are suitable especially for industrial use and thus high print runs. The The etching process has the disadvantage that used etching baths have to be carefully and expensive disposal. When machining metal surfaces through Laser for the production of printing forms has proven to be disadvantageous in that by melting beyond the surface of the printing form Melting burrs arise which have to be removed afterwards. This subsequent processing is a cost factor. It will also make the Edges of the indentations out of focus.
Aus den Veröffentlichungen EP 0 400 621 A2, DE 39 25 509 A1, GB 2 303 094 A sowie dem IBM Technical Disclosure Bulletin, Band 26, Nr. 4, Juli 1983, Seite 495, sind Druckformen bekannt, bei denen eine Keramikschicht auf einem Tragkörper aus Metall aufgetragen ist. Eine haltbare und innige Verbindung von Metall und Keramik ist nur mittels aufwändiger Auftragsverfahren des Keramikwerkstoffs möglich, beispielsweise dem Flammspritzen oder mit Hilfe einer Beschichtungskanone. Die Kombination von Metall und Keramik ist wegen der unterschiedlichen Ausdehnungskoeffizienten und Biegekoeffizienten der beiden Werkstoffe problematisch. Es besteht deshalb die Gefahr des Abplatzens der Keramikschicht von dem Tragkörper.From the publications EP 0 400 621 A2, DE 39 25 509 A1, GB 2 303 094 A. and the IBM Technical Disclosure Bulletin, Volume 26, No. 4, July 1983, page 495, are known printing forms in which a ceramic layer on a support body Metal is applied. A durable and intimate connection between metal and ceramic is only possible using complex application processes for the ceramic material, for example flame spraying or with the help of a coating gun. The The combination of metal and ceramic is different Expansion coefficients and bending coefficients of the two materials problematic. There is therefore a risk of the ceramic layer from flaking off the supporting body.
Aufgabe der vorliegenden Erfindung ist es, eine Druckform vorzustellen, die ohne die oben aufgeführten Nachteile einfach und sauber herzustellen ist und eine hohe Standzeit bei gleichbleibender Druckqualität aufweist.The object of the present invention is to present a printing form without the disadvantages listed above is simple and clean to manufacture and one has a long service life with constant print quality.
Die Lösung der Aufgabe erfolgt mit Hilfe der kennzeichnenden Merkmale des ersten Anspruchs. Weitere vorteilhafte Ausgestaltungen der Erfindung werden in den Unteransprüchen beansprucht. The task is solved with the help of the characteristic features of the first claim. Further advantageous embodiments of the invention are described in claimed the subclaims.
Eine erfindungsgemäße Druckform aus Keramik hat eine hohe Standzeit bei gleichbleibender Druckqualität. Sie eignet sich insbesondere zur Herstellung von Klischees. Die für die zu druckenden Darstellungen und die Schrift erforderlichen Vertiefungen lassen sich in der Regel durch alle für Keramik geeignete Bearbeitungsverfahren herstellen. Die bei der Herstellung entstehenden scharfen Konturenkanten gewährleisten eine saubere Wiedergabe mit scharfen Kanten der im Druck wiedergegebenen Darstellungen und Texte.A ceramic printing plate according to the invention has a long service life consistent print quality. It is particularly suitable for the production of Clichés. The ones required for the representations to be printed and the font As a rule, indentations can be made using all suitable for ceramics Manufacturing process. The sharp ones that arise during manufacture Contour edges ensure clean reproduction with sharp edges the representations and texts reproduced in print.
Um saubere und scharfkantige Konturen zu erreichen, ist es vorteilhaft, wenn der Korndurchmesser des Keramikwerkstoffs kleiner als 10 µm ist. Als besonders vorteilhaft hat es sich erwiesen, wenn der Korndurchmesser unter 5 µm liegt. Je geringer der Korndurchmesser ist, desto höher ist die mögliche Biegefestigkeit des Werkstoffs, die erzielbare Oberflächengüte sowie die Konturgenauigkeit.In order to achieve clean and sharp-edged contours, it is advantageous if the Grain diameter of the ceramic material is less than 10 microns. As special It has proven to be advantageous if the grain diameter is below 5 μm. ever the smaller the grain diameter, the higher the possible bending strength of the material, the achievable surface quality and the contour accuracy.
Als vorteilhaftes Bearbeitungsverfahren zur Materialabtragung für die Vertiefungen hat sich die Bearbeitung mit einem energiereichen Laserstrahl erwiesen. Für die Bearbeitung der Oberflächen der Druckformen ist das gleiche Laserbehandlungsverfahren verwendbar, mit dem beispielsweise eine Beschriftung der Kugelköpfe von Keramik-Endoprothesen des Hüftgelenks erfolgt. Durch diese vorgenommene Beschriftung mittels eines gesteuerten Laserstrahls entstehen lesbare Vertiefungen. Dieses Verfahren zur Kennzeichnung der Kugelköpfe hat sich bereits bewährt, wurde aber nicht für diesen erfinderischen Zweck genutzt. Der Materialabtrag der Vertiefungen beträgt etwa 15 bis 25 µm.As an advantageous processing method for material removal for the Processing with a high-energy laser beam has deepened proved. The same is true for processing the surfaces of the printing forms Laser treatment method can be used with which, for example Labeling of the ball heads of ceramic endoprostheses of the hip joint he follows. Through this labeling carried out by means of a controlled Readable depressions are created by the laser beam. This procedure for Marking the ball heads has already proven itself, but was not for used this inventive purpose. The removal of material from the wells is about 15 to 25 µm.
Das Abtragsverfahren mittels Laser unterscheidet sich wesentlich von dem aus der EP 0 741 117 A1 bekannten Verfahren. Dort wird eine speziell dotierte Oberfläche eines Keramikwerkstoffs mit einem Laserstrahl so behandelt, daß sich diese Oberfläche verfärbt. Dadurch wird auf der Oberfläche der Keramik direkt ein Bild erzeugt, das sich aber nicht von der Oberfläche der Keramik reproduzieren läßt. Aus diesem Grund unterscheidet sich die Laserbehandlung der Keramikoberfläche aus der genannten Schrift wesentlich von der Bearbeitung einer Keramikoberfläche zum Zwecke der Materialabtragung.The laser ablation process differs significantly from that the method known from EP 0 741 117 A1. There is a specially endowed Surface of a ceramic material treated with a laser beam so that this surface changes color. This will make the ceramic surface creates an image directly, but not from the surface of the ceramic reproduce. For this reason, laser treatment differs the ceramic surface from the above-mentioned script essentially from processing a ceramic surface for material removal.
Die Oberfläche der Druckform entscheidet wesentlich über die Druckqualität. Aus diesem Grund ist es vorteilhaft, wenn die Oberfläche der Druckvorlagen mindestens fein geschliffen ist und eine Rauhtiefe aufweist, die etwa bei 0,5 µm liegt. Eine hohe Konturenschärfe und eine gute Reinigung der Flächen, auf denen die Farbe nicht für eine Druckwiedergabe vorgesehen ist, wird mit einer polierten Oberfläche erreicht, deren Rauhtiefe Ra kleiner als 0,5 µm ist.The surface of the printing form largely determines the print quality. Out for this reason, it is advantageous if the surface of the artwork is at least finely ground and has a roughness depth of around 0.5 µm lies. High sharpness of contours and good cleaning of the surfaces which the color is not intended for print reproduction is marked with a polished surface whose surface roughness Ra is less than 0.5 µm.
Die Druckvorlagen aus Keramik können sowohl plattenförmig als auch walzenförmig sein. Es bietet sich damit die Formgebung der bisher bekannten Druckformen an. Als Werkstoff eignen sich alle Hochleistungskeramiken. Dazu zählen beispielsweise Keramiken auf Aluminiumoxid- oder auf Zirkonoxid-Basis. Auch Siliciumnitride bzw. -karbide eignen sich als Werkstoffe. Die Herstellung einer erfindungsgemäßen Druckform erfordert nur einen einzigen Bearbeitungsvorgang, der sich dazu unter Anwendung eines umweltfreundlichen Verfahrens, ohne Erfordernis der Entsorgung von umweltgefährdenden Abfallstoffen, durchführen läßt. Außerdem ist keine weitere Nachbearbeitung erforderlich.The ceramic artwork can be plate-shaped as well be cylindrical. It offers the shape of the previously known Printing forms. All high-performance ceramics are suitable as a material. To include, for example, ceramics based on aluminum oxide or zirconium oxide. Silicon nitrides and carbides are also suitable as materials. The production a printing form according to the invention requires only one Machining process that involves using an environmentally friendly Procedure, without the need to dispose of environmentally hazardous Waste materials, can be carried out. In addition, there is no further post-processing required.
Die scharfkantige Kontur der Darstellungen und der Schrift sowie die hohe Qualität und geringe Rauhigkeit der Oberfläche gewährleisten, daß ein sauberer Farbauftrag auf das zu bedruckende Medium, entweder direkt oder indirekt, gewährleistet ist. Beim direkten Druck, beispielsweise beim Auftrag auf Papier, ist aufgrund der geringen Affinität der Farbe zur Keramik ein sauberes Herauslösen der Farbe aus der Druckform gewährleistet. Ebenso ist es bei indirekten Druckverfahren, beispielsweise beim Tampondruckverfahren. Bei diesen Druckverfahren wird die Farbe zunächst von der Druckform auf einen Zwischenträger, beispielsweise eine Gummiwalze, und dann erst von diesem auf die zu bedruckende Oberfläche übertragen. The sharp-edged contour of the representations and the writing as well as the high one Quality and low roughness of the surface ensure that a cleaner Ink application to the medium to be printed, either directly or indirectly, is guaranteed. With direct printing, for example when applying on paper, is due to the low affinity of the color for the ceramic, a clean removal guaranteed the color from the printing form. It is the same with indirect Printing process, for example in the pad printing process. With these Printing process, the color is first transferred from the printing form to one Intermediate carrier, for example a rubber roller, and only then from this transfer the surface to be printed.
An Hand von Ausführungsbeispielen wird die Erfindung näher erläutert.The invention is explained in more detail using exemplary embodiments.
Es zeigen:
Figur 1- eine Druckform in Form einer Platte mit einer Schrift als Darstellung,
- Figur 2
- zeigt eine walzenförmige Druckform, geschnitten, mit weiteren Darstellungen.
- Figure 1
- a printing form in the form of a plate with a font as a representation,
- Figure 2
- shows a roller-shaped printing form, cut, with further representations.
In Figur 1 ist die Druckform 1 eine Platte aus Aluminiumoxid, Al2O3. In die
polierte Oberfläche 2 ist die zu druckende Darstellung 3 durch Vertiefungen 4
mittels Laserabtrag eingebracht worden. Die Vertiefungen 4 sind an der
weggebrochenen unteren rechten Ecke der Druckform 1 zu erkennen. Weiterhin
sind die scharfen Kanten 5 der Konturen der Vertiefungen 4 zu erkennen.In FIG. 1, the
Figur 2 zeigt eine walzenförmige Druckform 10. Sie dreht sich um eine Achse 11
mittels eines hier nicht dargestellten Antriebs, um die Farbe zunächst auf einen
Zwischenträger oder direkt auf die zu bedruckende Fläche zu übertragen. Die
Oberfläche 12 ist ebenfalls poliert. Zum Drucken der Darstellungen 13 werden
die Vertiefungen 14 mit Farbe gefüllt. Wie im vorgehenden Ausführungsbeispiel,
sind auch hier die scharfen Kanten 15 der Konturen der Vertiefungen 14,
insbesondere im Schnitt, deutlich zu erkennen. Der Werkstoff der vorliegenden
walzenförmigen Druckform 10 kann beispielsweise aus Zirkonoxid-Keramik
bestehen. Sie weist besonders hinsichtlich der Biegewechselfestigkeit gute
mechanische Eigenschaften auf.FIG. 2 shows a roller-
Claims (9)
- Printing forme (1; 10) into which representations and type (3; 13) that are to be printed are worked as depressions (4; 14) by removing material, with the depressions being filled with ink for printing and the ink being capable of being transferred directly or indirectly onto the area that is to be printed, characterized in that the printing forme (1; 10) is a solid body made of ceramic material, and in that the grain diameter of the ceramic material of the printing forme (1; 10) is smaller than 10 µm.
- Printing forme according to claim 1, characterized in that the grain diameter of the ceramic material of the printing forme (1; 10) is smaller than 5 µm.
- Printing forme according to one of claims 1 or 2, characterized in that the depressions (4; 14) of the representations and the type (3; 13) to be printed have been worked out of the surface (2; 12) of the printing forme (1; 10) by means of a laser beam.
- Printing forme according to one of claims 1 to 3, characterized in that the material removal from the depressions (4; 14) amounts to approximately 15 to 25 µm.
- Printing forme according to one of claims 1 to 4, characterized in that its surface (2; 12) is finely ground.
- Printing forme according to one of claims 1 to 4, characterized in that its surface (2; 12) is polished.
- Printing forme according to claim 6, characterized in that the surface (2; 12) has a surface roughness Ra of less than 0.5 µm.
- Printing forme according to one of claims 1 to 7, characterized in that it (1) is plate-shaped.
- Printing forme according to one of claims 1 to 7, characterized in that it (10) is cylindrical.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19754685 | 1997-12-10 | ||
| DE19754685 | 1997-12-10 | ||
| DE19755202A DE19755202A1 (en) | 1997-12-10 | 1997-12-12 | Ceramic printing plate |
| DE19755202 | 1997-12-12 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0922590A1 EP0922590A1 (en) | 1999-06-16 |
| EP0922590B1 true EP0922590B1 (en) | 2002-07-24 |
Family
ID=26042315
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP98123560A Expired - Lifetime EP0922590B1 (en) | 1997-12-10 | 1998-12-10 | Ceramic printing form |
Country Status (1)
| Country | Link |
|---|---|
| EP (1) | EP0922590B1 (en) |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5047116A (en) * | 1989-05-31 | 1991-09-10 | Union Carbide Coatings Service Technology Corporation | Method for producing liquid transfer articles |
| DE3925509C2 (en) * | 1989-08-02 | 1994-03-03 | Wetzel Walter Gmbh | Pressure disc for printing on cables |
| NL9101971A (en) * | 1991-11-25 | 1993-06-16 | Stork Screens Bv | METAL PLATE FOR THE MANUFACTURE OF A DEEP PRESSURE SLEEVE AND METHOD OF MANUFACTURING THAT. |
| DE19507827C2 (en) * | 1995-02-22 | 1999-03-25 | Hartmut Frerichs | Process for the production of a printing form for offset or gravure printing |
| GB2303094A (en) * | 1995-07-12 | 1997-02-12 | Bernard John Boyle | Laser engraved ceramic gravure cylinder |
-
1998
- 1998-12-10 EP EP98123560A patent/EP0922590B1/en not_active Expired - Lifetime
Non-Patent Citations (1)
| Title |
|---|
| Kirk-Othmer: Encyklopedia of Chemical Technology, 4. Ausgabe, Band 5, Seiten 599 und 600 * |
Also Published As
| Publication number | Publication date |
|---|---|
| EP0922590A1 (en) | 1999-06-16 |
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