EP3812155A1 - Printing system for rotary screen printing comprising a screen printing cylinder with flexible surface elements - Google Patents
Printing system for rotary screen printing comprising a screen printing cylinder with flexible surface elements Download PDFInfo
- Publication number
- EP3812155A1 EP3812155A1 EP20200439.6A EP20200439A EP3812155A1 EP 3812155 A1 EP3812155 A1 EP 3812155A1 EP 20200439 A EP20200439 A EP 20200439A EP 3812155 A1 EP3812155 A1 EP 3812155A1
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- EP
- European Patent Office
- Prior art keywords
- screen printing
- cylinder
- surface elements
- printing cylinder
- flexible surface
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- 238000007650 screen-printing Methods 0.000 title claims abstract description 80
- 238000007639 printing Methods 0.000 title claims abstract description 41
- 238000010022 rotary screen printing Methods 0.000 title claims abstract description 23
- 239000000463 material Substances 0.000 claims description 40
- 238000000034 method Methods 0.000 claims description 10
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 239000012858 resilient material Substances 0.000 claims description 2
- 238000004026 adhesive bonding Methods 0.000 description 3
- 229920001971 elastomer Polymers 0.000 description 2
- 238000003384 imaging method Methods 0.000 description 2
- 239000000123 paper Substances 0.000 description 2
- 230000032258 transport Effects 0.000 description 2
- 208000012886 Vertigo Diseases 0.000 description 1
- 239000011111 cardboard Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000013013 elastic material Substances 0.000 description 1
- 239000000806 elastomer Substances 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 238000007373 indentation Methods 0.000 description 1
- 238000003698 laser cutting Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 229920003052 natural elastomer Polymers 0.000 description 1
- 229920001194 natural rubber Polymers 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 239000005060 rubber Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 229920003051 synthetic elastomer Polymers 0.000 description 1
- 239000005061 synthetic rubber Substances 0.000 description 1
- 239000004753 textile Substances 0.000 description 1
- -1 wallpaper Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F15/00—Screen printers
- B41F15/08—Machines
- B41F15/0804—Machines for printing sheets
- B41F15/0809—Machines for printing sheets with cylindrical or belt-like screens
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F15/00—Screen printers
- B41F15/14—Details
- B41F15/34—Screens, Frames; Holders therefor
- B41F15/38—Screens, Frames; Holders therefor curved
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F15/00—Screen printers
- B41F15/08—Machines
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F13/00—Common details of rotary presses or machines
- B41F13/08—Cylinders
- B41F13/085—Cylinders with means for preventing or damping vibrations or shocks
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F15/00—Screen printers
- B41F15/14—Details
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F21/00—Devices for conveying sheets through printing apparatus or machines
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F21/00—Devices for conveying sheets through printing apparatus or machines
- B41F21/10—Combinations of transfer drums and grippers
Definitions
- the present invention relates to a printing system for rotary screen printing, comprising a screen printing cylinder with flexible surface elements, a printing machine for rotary screen printing, including such a printing system, a screen printing cylinder with flexible surface elements, a method for producing such a screen printing cylinder and the use of such a screen printing cylinder in a rotary screen printing process .
- rotary screen printing a screen printing cylinder usually cooperates with an impression cylinder to form a printing nip.
- the printing medium for example printing ink
- Many different substrates can be printed in rotary screen printing, for example textiles, wallpaper, paper, cardboard and foils.
- Rotary screen printing is used, on the one hand, for continuous printing, in which the material to be printed is transported from roll to roll. An important application of continuous rotary screen printing is the printing of labels.
- rotary screen printing is also used in sheet-fed printing machines in which the material to be printed on is not fed continuously from roll to roll, but in the form of individual sheets to be printed.
- the impression cylinder In rotary screen printing on sheet-fed printing machines, the impression cylinder usually has a gripping system with one or more sheet grippers, which takes the individual sheets with it and guides them past the screen printing cylinder.
- a gripping system with one or more sheet grippers, which takes the individual sheets with it and guides them past the screen printing cylinder.
- different solutions have been proposed in the prior art.
- it is known to periodically move the screen printing cylinder together with the squeegee, i.e. to increase the distance to the impression cylinder in order to make room for the to create sublime gripping system.
- the EP 0 723 864 A1 describes a rotary screen printing machine for sheet printing with an impression cylinder which has a cylinder pit in which the sheet gripper is sunk.
- the WO 99/48690 describes a rotary screen printing process for printing sheets, in which the sheets are guided through the coating section by means of grippers.
- the WO 01/54907 A1 describes a sheet-fed printing machine with two screen printing cylinders for printing both sides of a printing material, at least one of the screen printing cylinders having a holding device for the sheet-like printing material and at least one of the screen printing cylinders having an indentation on its peripheral surface as a counterpart to the holding device.
- the prior art solutions are associated with disadvantages.
- the regular engagement and disengagement of the screen printing cylinder and squeegee must be precisely matched to the screen printing cylinder, squeegee and impression cylinder.
- the simultaneous engagement and disengagement of the screen printing cylinder and squeegee is technically and mechanically demanding, can limit the printing speed and make the components involved more maintenance-free.
- the lowering of the gripping system in the impression cylinder places increased demands on the gripper mechanics, so that the comparatively robust and inexpensive grippers used in raised gripping systems often cannot be used.
- An undesirable effect of recessed gripping systems is increased folding of the guided sheet. This can lead to problems when transferring the sheet to the next driver roller and when stacking the finished printed sheets.
- the object of the present invention is to provide a printing system comprising screen printing cylinders and impression cylinders with a raised gripping system for rotary screen printing of sheet-like printing materials, which has the disadvantages of the prior art avoids.
- the printing system should be compatible with conventional impression cylinders with a raised gripping system and not require frequent engagement and disengagement of the screen printing cylinder. Heavy folding of the guided sheet should be avoided.
- the screen printing cylinder in a printing system comprising screen printing cylinders and impression cylinders with a raised sheet gripping system does not need to be disengaged before contact with the raised sheet gripping system of the impression cylinder when the contact points of the screen printing cylinder with the sheet gripping system of the impression cylinder with an elastic and / or resilient surface element provides.
- the printing system according to the invention makes it possible to use conventional impression cylinders with a raised gripping system and places lower demands on the control and mechanics of the cylinders. Frequent engagement and disengagement of the screen printing cylinder is avoided. Wear and maintenance of the components involved are reduced. There is no unwanted folding of the guided sheet during transport through the printing nip. Printed products of high optical quality are obtained.
- the present invention relates to a printing system for rotary screen printing, comprising a screen printing cylinder and an impression cylinder cooperating with the screen printing cylinder, which has one or more surface elements protruding from its cylinder jacket, the screen printing cylinder having one or more flexible surface elements on its cylinder jacket, which with the one or a plurality of surface elements protruding from the cylinder jacket of the impression cylinder interact.
- the one or more surface elements protruding from the cylinder jacket of the impression cylinder are one or more sheet grippers.
- the one or more flexible surface elements of the screen printing cylinder in the printing system according to the invention are designed to be elastic and / or resilient.
- a "flexible surface element” is understood to mean, in particular, a surface element that can be brought from its original shape into an expanded shape when the force is exerted by an element protruding from the cylinder jacket of the impression cylinder and, when the force is exerted, is restored from this expanded shape returns to its original shape.
- the one or more resilient surface elements are preferably designed to be elastic and / or resilient. In a particularly preferred embodiment, the one or more surface elements are designed to be elastic.
- the flexible surface element is designed to be elastic, it comprises at least one elastic material, preferably one or more plastics, particularly preferably one or more elastomers. Vulcanized natural and synthetic rubbers are very particularly preferred, especially rubber. If the flexible surface element is designed to be resilient, it preferably comprises one or more flat springs.
- the present invention also relates to a screen printing cylinder which can advantageously be used in the printing system according to the invention.
- the present invention also relates to a screen printing cylinder for rotary screen printing, which comprises one or more flexible surface elements on its cylinder jacket.
- the one or more flexible surface elements of the screen printing cylinder according to the invention are designed to be elastic and / or resilient.
- Preferred materials for the resilient surface elements are those mentioned above as being preferred.
- the one or more flexible surface elements of the screen printing cylinder according to the invention are designed as elliptical patches, particularly preferably as circular patches.
- the screen printing cylinder according to the invention comprises a plurality of flexible surface elements which are arranged in a row parallel to the cylinder axis of the screen printing cylinder.
- the screen printing cylinder preferably comprises 2, 3, 4, 5 or 6 flexible surface elements, particularly preferably 3, 4 or 5 flexible surface elements.
- the screen printing cylinder material provided in step a) is usually an already imaged screen printing cylinder material.
- the production of the openings in step b) can also take place in a screen printing cylinder material that has not yet been illustrated, with the imaging of the screen printing cylinder material then usually before or after step c), namely after steps a) and optionally b) and before step c ) or after step c) and before step d).
- the imaging can be carried out according to methods known in principle from the prior art and generally comprises the steps of exposure, washing out and drying.
- Suitable screen printing cylinder materials are, for example, under the brand name Screeny® from Gallus Ferd. Kniesch AG, St. Gallen, Switzerland, commercially available.
- step b) can be produced by methods known in principle to the person skilled in the art, for example by punching, laser cutting or mechanical cutting.
- the flexible material can be fastened in step c) by methods known in principle, for example by gluing.
- the fixing of the arch-shaped screen printing cylinder material in cylindrical form in step d) can take place according to methods known in principle to the person skilled in the art, for example with the aid of a welding device.
- the present invention also relates to a printing machine for rotary screen printing, comprising one or more printing systems according to the invention.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Screen Printers (AREA)
Abstract
Es wird ein Drucksystem für den Rotationssiebdruck beschrieben, welches einen Siebdruckzylinder (1) mit nachgiebigen Oberflächenelementen (6) aufweist. Die nachgiebigen Oberflächenelemente (6) geben beim Kontakt mit den aus dem Gegendruckzylinder (2) herausstehenden Bogengreifern (4) nach, so dass kein Ausrücken des Siebdruckzylinders (1) zur Vermeidung des Kontakts mit den Bogengreifern (4) erforderlich ist.A printing system for rotary screen printing is described which has a screen printing cylinder (1) with flexible surface elements (6). The flexible surface elements (6) yield when they come into contact with the sheet grippers (4) protruding from the impression cylinder (2), so that the screen printing cylinder (1) does not have to be disengaged to avoid contact with the sheet grippers (4).
Description
Die vorliegende Erfindung betrifft ein Drucksystem für den Rotationssiebdruck, umfassend einen Siebdruckzylinder mit nachgiebigen Oberflächenelementen, eine Druckmaschine für den Rotationssiebdruck, umfassend ein solches Drucksystem, einen Siebdruckzylinder mit nachgiebigen Oberflächenelementen, ein Verfahren zur Herstellung eines solchen Siebdruckzylinders und die Verwendung eines solchen Siebdruckzylinders in einem Rotationssiebdruckverfahren.The present invention relates to a printing system for rotary screen printing, comprising a screen printing cylinder with flexible surface elements, a printing machine for rotary screen printing, including such a printing system, a screen printing cylinder with flexible surface elements, a method for producing such a screen printing cylinder and the use of such a screen printing cylinder in a rotary screen printing process .
In der Druckindustrie hat das Druckverfahren des Rotationssiebdrucks breite Anwendung gefunden. Beim Rotationssiebdruck wirkt üblicherweise ein Siebdruckzylinder mit einem Gegendruckzylinder zusammen, um einen Druckspalt zu bilden. Mittels einer Rakel wird das Druckmedium, beispielsweise Druckfarbe, durch den Siebdruckzylinder auf den Bedruckstoff aufgebracht. Im Rotationssiebdruck können viele verschiedene Bedruckstoffe bedruckt werden, beispielsweise Textilien, Tapeten, Papier, Karton und Folien. Der Rotationssiebdruck findet zum einen beim kontinuierlichen Bedrucken, bei der das zu bedruckende Material von Rolle zu Rolle transportiert wird, Anwendung. Eine wichtige Anwendung des kontinuierlichen Rotationssiebdrucks ist das Drucken von Etiketten. Zum anderen wird der Rotationssiebdruck auch in Bogendruckmaschinen eingesetzt, bei denen das zu bedruckende Material der Druckmaschine nicht kontinuierlich von Rolle zu Rolle, sondern in Form einzelner zu bedruckender Bögen zugeführt wird.The printing process of rotary screen printing has found wide application in the printing industry. In rotary screen printing, a screen printing cylinder usually cooperates with an impression cylinder to form a printing nip. The printing medium, for example printing ink, is applied to the printing material through the screen printing cylinder by means of a doctor blade. Many different substrates can be printed in rotary screen printing, for example textiles, wallpaper, paper, cardboard and foils. Rotary screen printing is used, on the one hand, for continuous printing, in which the material to be printed is transported from roll to roll. An important application of continuous rotary screen printing is the printing of labels. On the other hand, rotary screen printing is also used in sheet-fed printing machines in which the material to be printed on is not fed continuously from roll to roll, but in the form of individual sheets to be printed.
Beim Rotationssiebdruck auf Bogendruckmaschinen weist der Gegendruckzylinder üblicherweise ein Greifsystem mit ein oder mehreren Bogengreifern auf, welches die einzelnen Bögen mitnimmt und am Siebdruckzylinder vorbeiführt. Um zu vermeiden, dass das Greifsystem des Gegendruckzylinders, welches normalerweise aus dem Zylindermantel des Gegendruckzylinders hervorsteht, mit dem Siebdruckzylinder kollidiert, sind im Stand der Technik unterschiedliche Lösungen vorgeschlagen worden. Zum einen ist es bekannt, den Siebdruckzylinder zusammen mit der Rakel periodisch auszurücken, also die Distanz zum Gegendruckzylinder zu vergrößern, um Platz für das erhabene Greifsystem zu schaffen. Zum anderen wurde vorgeschlagen, das Greifsystem im Gegendruckzylinder zu versenken.In rotary screen printing on sheet-fed printing machines, the impression cylinder usually has a gripping system with one or more sheet grippers, which takes the individual sheets with it and guides them past the screen printing cylinder. In order to avoid that the gripping system of the impression cylinder, which normally protrudes from the cylinder jacket of the impression cylinder, collides with the screen printing cylinder, different solutions have been proposed in the prior art. On the one hand, it is known to periodically move the screen printing cylinder together with the squeegee, i.e. to increase the distance to the impression cylinder in order to make room for the to create sublime gripping system. On the other hand, it was proposed to lower the gripping system in the impression cylinder.
Die
Die
Die
Die Lösungen des Standes der Technik sind mit Nachteilen verbunden. Das regelmäßige Ein- und Ausrücken von Siebdruckzylinder und Rakel muss präzise auf Siebdruckzylinder, Rakel und Gegendruckzylinder abgestimmt werden. Das gleichzeitige Ein- und Ausrücken von Siebdruckzylinder und Rakel ist steuerungstechnisch und mechanisch anspruchsvoll, kann die Druckgeschwindigkeit begrenzen und zu einer höheren Wartungsanfälligkeit der beteiligten Bauteile führen. Das Versenken des Greifsystems im Gegendruckzylinder stellt erhöhte Anforderungen an die Greifermechanik, so dass oftmals nicht die vergleichsweise robusten und kostengünstigen in erhabenen Greifsystemen verwendeten Greifer eingesetzt werden können. Ein unerwünschter Effekt von versenkten Greifsystemen ist eine verstärkte Falzung des geführten Bogens. Hierdurch kann es zu Problemen bei der Übergabe des Bogens zur nächsten Mitnehmerwalze und beim Stapeln der fertig bedruckten Bögen kommen.The prior art solutions are associated with disadvantages. The regular engagement and disengagement of the screen printing cylinder and squeegee must be precisely matched to the screen printing cylinder, squeegee and impression cylinder. The simultaneous engagement and disengagement of the screen printing cylinder and squeegee is technically and mechanically demanding, can limit the printing speed and make the components involved more maintenance-free. The lowering of the gripping system in the impression cylinder places increased demands on the gripper mechanics, so that the comparatively robust and inexpensive grippers used in raised gripping systems often cannot be used. An undesirable effect of recessed gripping systems is increased folding of the guided sheet. This can lead to problems when transferring the sheet to the next driver roller and when stacking the finished printed sheets.
Es ist Aufgabe der vorliegenden Erfindung, ein Drucksystem umfassend Siebdruckzylinder und Gegendruckzylinder mit erhabenem Greifsystem für den Rotationssiebdruck von bogenförmigen Bedruckstoffen anzugeben, das die Nachteile des Standes der Technik vermeidet. Das Drucksystem sollte mit herkömmlichen Gegendruckzylindern mit erhabenem Greifsystem kompatibel sein und kein häufiges Ein- und Ausrücken des Siebdruckzylinders erfordern. Eine verstärkte Falzung des geführten Bogens sollte vermieden werden.The object of the present invention is to provide a printing system comprising screen printing cylinders and impression cylinders with a raised gripping system for rotary screen printing of sheet-like printing materials, which has the disadvantages of the prior art avoids. The printing system should be compatible with conventional impression cylinders with a raised gripping system and not require frequent engagement and disengagement of the screen printing cylinder. Heavy folding of the guided sheet should be avoided.
Überraschenderweise wurde gefunden, dass man den Siebdruckzylinder in einem Drucksystem umfassend Siebdruckzylinder und Gegendruckzylinder mit erhabenem Bogengreifsystem nicht vor dem Kontakt mit dem erhabenen Bogengreifsystem des Gegendruckzylinders auszurücken braucht, wenn man die Kontaktstellen des Siebdruckzylinders mit dem Bogengreifsystem des Gegendruckzylinders mit einem elastischen und/oder federnden Oberflächenelement versieht.Surprisingly, it has been found that the screen printing cylinder in a printing system comprising screen printing cylinders and impression cylinders with a raised sheet gripping system does not need to be disengaged before contact with the raised sheet gripping system of the impression cylinder when the contact points of the screen printing cylinder with the sheet gripping system of the impression cylinder with an elastic and / or resilient surface element provides.
Das erfindungsgemäße Drucksystem ermöglicht es, herkömmliche Gegendruckzylinder mit erhabenem Greifsystem einzusetzen und stellt geringere Anforderungen an Steuerung und Mechanik der Zylinder. Ein häufiges Ein- und Ausrücken des Siebdruckzylinders wird vermieden. Der Verschleiß und die Wartungsanfälligkeit der beteiligten Bauteile werden verringert. Es kommt zu keiner unerwünschten Falzung des geführten Bogens beim Transport durch den Druckspalt. Man erhält Druckerzeugnisse hoher optischer Qualität.The printing system according to the invention makes it possible to use conventional impression cylinders with a raised gripping system and places lower demands on the control and mechanics of the cylinders. Frequent engagement and disengagement of the screen printing cylinder is avoided. Wear and maintenance of the components involved are reduced. There is no unwanted folding of the guided sheet during transport through the printing nip. Printed products of high optical quality are obtained.
Dementsprechend betrifft die vorliegende Erfindung ein Drucksystem für den Rotationssiebdruck, umfassend einen Siebdruckzylinder und einen mit dem Siebdruckzylinder zusammenwirkenden Gegendruckzylinder, der ein oder mehrere aus seinem Zylindermantel herausstehende Oberflächenelemente aufweist, wobei der Siebdruckzylinder auf seinem Zylindermantel ein oder mehrere nachgiebige Oberflächenelemente aufweist, welche mit den ein oder mehreren aus dem Zylindermantel des Gegendruckzylinders herausstehenden Oberflächenelementen zusammenwirken.Accordingly, the present invention relates to a printing system for rotary screen printing, comprising a screen printing cylinder and an impression cylinder cooperating with the screen printing cylinder, which has one or more surface elements protruding from its cylinder jacket, the screen printing cylinder having one or more flexible surface elements on its cylinder jacket, which with the one or a plurality of surface elements protruding from the cylinder jacket of the impression cylinder interact.
In einer bevorzugten Ausführungsform handelt es sich bei den ein oder mehreren aus dem Zylindermantel des Gegendruckzylinders herausstehenden Oberflächenelementen um ein oder mehrere Bogengreifer.In a preferred embodiment, the one or more surface elements protruding from the cylinder jacket of the impression cylinder are one or more sheet grippers.
In einer weiteren bevorzugten Ausführungsform sind die ein oder mehreren nachgiebigen Oberflächenelemente des Siebdruckzylinders im erfindungsgemäßen Drucksystem elastisch und/oder federnd ausgestaltet.In a further preferred embodiment, the one or more flexible surface elements of the screen printing cylinder in the printing system according to the invention are designed to be elastic and / or resilient.
Im Rahmen vorliegender Erfindung wird unter einem "nachgiebigen Oberflächenelement" insbesondere ein Oberflächenelement verstanden, das bei Krafteinwirkung durch ein aus dem Zylindermantel des Gegendruckzylinders herausstehendes Element aus seiner ursprünglichen Form in eine gedehnte Form gebracht werden kann und aus dieser gedehnten Form bei Nachlassen der Krafteinwirkung wieder in seine ursprüngliche Form zurückgeht. Die ein oder mehreren nachgiebigen Oberflächenelemente sind bevorzugt elastisch und/oder federnd ausgestaltet. In einer besonders bevorzugten Ausführungsform sind die ein oder mehreren Oberflächenelemente elastisch ausgestaltet.In the context of the present invention, a "flexible surface element" is understood to mean, in particular, a surface element that can be brought from its original shape into an expanded shape when the force is exerted by an element protruding from the cylinder jacket of the impression cylinder and, when the force is exerted, is restored from this expanded shape returns to its original shape. The one or more resilient surface elements are preferably designed to be elastic and / or resilient. In a particularly preferred embodiment, the one or more surface elements are designed to be elastic.
Sofern das nachgiebige Oberflächenelement elastisch ausgestaltet ist, umfasst es wenigstens ein elastisches Material, bevorzugt ein oder mehrere Kunststoffe, besonders bevorzugt ein oder mehrere Elastomere. Ganz besonders bevorzugt sind vulkanisierte Natur- und Synthesekautschuke, speziell handelt es sich um Gummi. Sofern das nachgiebige Oberflächenelement federnd ausgestaltet ist, umfasst es bevorzugt ein oder mehrere flache Federn.If the flexible surface element is designed to be elastic, it comprises at least one elastic material, preferably one or more plastics, particularly preferably one or more elastomers. Vulcanized natural and synthetic rubbers are very particularly preferred, especially rubber. If the flexible surface element is designed to be resilient, it preferably comprises one or more flat springs.
Die vorliegende Erfindung betrifft auch einen Siebdruckzylinder, der vorteilhaft in dem erfindungsgemäßen Drucksystem verwendet werden kann.The present invention also relates to a screen printing cylinder which can advantageously be used in the printing system according to the invention.
Dementsprechend betrifft die vorliegende Erfindung auch einen Siebdruckzylinder für den Rotationssiebdruck, der ein oder mehrere nachgiebige Oberflächenelemente auf seinem Zylindermantel umfasst.Accordingly, the present invention also relates to a screen printing cylinder for rotary screen printing, which comprises one or more flexible surface elements on its cylinder jacket.
In einer bevorzugten Ausführungsform sind die ein oder mehreren nachgiebigen Oberflächenelemente des erfindungsgemäßen Siebdruckzylinders elastisch und/oder federnd ausgestaltet. Bevorzugte Materialien für die nachgiebigen Oberflächenelemente sind die oben als bevorzugt genannten.In a preferred embodiment, the one or more flexible surface elements of the screen printing cylinder according to the invention are designed to be elastic and / or resilient. Preferred materials for the resilient surface elements are those mentioned above as being preferred.
In einer weiteren bevorzugten Ausführungsform sind die ein oder mehreren nachgiebigen Oberflächenelemente des erfindungsgemäßen Siebdruckzylinders als elliptische Patches, besonders bevorzugt als kreisförmige Patches, ausgestaltet.In a further preferred embodiment, the one or more flexible surface elements of the screen printing cylinder according to the invention are designed as elliptical patches, particularly preferably as circular patches.
In einer weiteren bevorzugten Ausführungsform umfasst der erfindungsgemäße Siebdruckzylinder mehrere nachgiebige Oberflächenelemente, welche in einer Reihe parallel zur Zylinderachse des Siebdruckzylinders angeordnet sind. In dieser Ausführungsform umfasst der Siebdruckzylinder bevorzugt 2, 3, 4, 5 oder 6 nachgiebige Oberflächenelemente, besonders bevorzugt 3, 4 oder 5 nachgiebige Oberflächenelemente.In a further preferred embodiment, the screen printing cylinder according to the invention comprises a plurality of flexible surface elements which are arranged in a row parallel to the cylinder axis of the screen printing cylinder. In this embodiment, the screen printing cylinder preferably comprises 2, 3, 4, 5 or 6 flexible surface elements, particularly preferably 3, 4 or 5 flexible surface elements.
Die vorliegende Erfindung betrifft auch ein Verfahren zur Herstellung eines Siebdruckzylinders mit ein oder mehreren nachgiebigen Oberflächenelementen auf seinem Zylindermantel, umfassend die folgenden Schritte:
- a) Bereitstellen eines bogenförmigen Siebdruckzylindermaterials,
- b) gegebenenfalls Herstellen von ein oder mehreren Öffnungen in dem bogenförmigen Siebdruckzylindermaterial,
- c) Befestigen eines nachgiebigen Materials auf dem bogenförmigen Siebdruckzylindermaterial und/oder in den ein oder mehreren Öffnungen des bogenförmigen Siebdruckzylindermaterials und
- d) Fixieren des bogenförmigen Siebdruckzylindermaterials in zylindrischer Form unter Erhalt des Siebdruckzylinders.
- a) Providing an arch-shaped screen printing cylinder material,
- b) optionally producing one or more openings in the arch-shaped screen printing cylinder material,
- c) attaching a resilient material to the arcuate screen printing cylinder material and / or in the one or more openings in the arcuate screen printing cylinder material and
- d) fixing the sheet-like screen printing cylinder material in a cylindrical shape to obtain the screen printing cylinder.
Bei dem in Schritt a) bereitgestellten Siebdruckzylindermaterial handelt es sich in der Regel um ein bereits bebildertes Siebdruckzylindermaterial. Prinzipiell kann das Herstellen der Öffnungen in Schritt b) jedoch auch in einem noch nicht bebilderten Siebdruckzylindermaterial erfolgen, wobei das Bebildern des Siebdruckzylindermaterials dann in der Regel vor oder nach Schritt c), nämlich nach den Schritten a) und gegebenenfalls b) und vor Schritt c) oder nach Schritt c) und vor Schritt d), erfolgt. Das Bebildern kann nach aus dem Stand der Technik prinzipiell bekannten Verfahren durchgeführt werden und umfasst in der Regel die Schritte Belichten, Auswaschen und Trocknen. Geeignete Siebdruckzylindermaterialien sind beispielsweise unter dem Markennamen Screeny® von der Gallus Ferd. Rüesch AG, St. Gallen, Schweiz, kommerziell erhältlich. Das Herstellen der Öffnungen in Schritt b) kann nach dem Fachmann prinzipiell bekannten Verfahren erfolgen, beispielsweise durch Stanzen, Laserschneiden oder mechanisches Schneiden. Das Befestigen des nachgiebigen Materials in Schritt c) kann nach prinzipiell bekannten Verfahren erfolgen, beispielsweise durch Kleben. Das Fixieren des bogenförmigen Siebdruckzylindermaterials in zylindrischer Form in Schritt d) kann nach dem Fachmann prinzipiell bekannten Verfahren erfolgen, beispielsweise unter Zuhilfenahme einer Schweißvorrichtung.The screen printing cylinder material provided in step a) is usually an already imaged screen printing cylinder material. In principle, however, the production of the openings in step b) can also take place in a screen printing cylinder material that has not yet been illustrated, with the imaging of the screen printing cylinder material then usually before or after step c), namely after steps a) and optionally b) and before step c ) or after step c) and before step d). The imaging can be carried out according to methods known in principle from the prior art and generally comprises the steps of exposure, washing out and drying. Suitable screen printing cylinder materials are, for example, under the brand name Screeny® from Gallus Ferd. Rüesch AG, St. Gallen, Switzerland, commercially available. The openings in step b) can be produced by methods known in principle to the person skilled in the art, for example by punching, laser cutting or mechanical cutting. The flexible material can be fastened in step c) by methods known in principle, for example by gluing. The fixing of the arch-shaped screen printing cylinder material in cylindrical form in step d) can take place according to methods known in principle to the person skilled in the art, for example with the aid of a welding device.
Die vorliegende Erfindung betrifft auch eine Druckmaschine für den Rotationssiebdruck, umfassend ein oder mehrere erfindungsgemäße Drucksysteme.The present invention also relates to a printing machine for rotary screen printing, comprising one or more printing systems according to the invention.
Die vorliegende Erfindung betrifft auch die Verwendung eines Siebdruckzylinders mit ein oder mehreren nachgiebigen Oberflächenelementen auf seinem Zylindermantel in einem Rotationssiebdruckverfahren.
-
zeigt ein erfindungsgemäßes Drucksystem. Der Siebdruckzylinder (1) weist vier nachgiebige Oberflächenelemente (6) auf, die in einer Reihe parallel zur Zylinderachse des Siebdruckzylinders (1) angeordnet sind (seitlich dargestellt). Der Gegendruckzylinder (2) transportiert einen Bogen (10) des Bedruckstoffs, beispielsweise Papier, welcher durch ein Paar der Bogengreifer (4) festgehalten wird. Die Rakel (9) ist noch nicht ausgerückt. Siebdruckzylinder (1) und Gegendruckzylinder (2) sind so aufeinander abgestimmt, dass die nachgiebigen Oberflächenelemente (6) des Siebdruckzylinders (1) beim kontinuierlichen Drehen der beiden Zylinder (1, 2) genau über den beiden Paaren der Bogengreifer (4) des Gegendruckzylinders (2) zum Liegen kommen.Figur 1 -
zeigt das gleiche Drucksystem wie inFigur 2 , wobei das bogenführende Paar der Bogengreifer (4) und die nachgiebigen Oberflächenelemente (6) miteinander in Kontakt kommen. Die Rakel (9) ist ausgerückt. Wegen der nachgiebigen Eigenschaft der Oberflächenelemente (6) werden die Oberflächenelemente (6) beim Kontakt mit dem Paar der Bogengreifer (4) nach innen gewölbt. Nach Ende des Kontakts wölben sich die Oberflächenelemente (6) wieder in ihre Ausgangsposition (nicht dargestellt).Figur 1 -
zeigt einen erfindungsgemäßen Siebdruckzylinder (1). Dieser weist drei nachgiebige Oberflächenelemente (6) auf seinem Zylindermantel (5) auf. Die Oberflächenelemente (6) sind in einer Reihe parallel zur Zylinderachse (7) des Siebdruckzylinders (1) angeordnet.Figur 3 -
zeigt einen erfindungsgemäßen Siebdruckzylinder (1), welcher nur ein nachgiebiges Oberflächenelement (6) aufweist, welches sich über die gesamte Zylinderlänge erstreckt.Figur 4 -
zeigt verschiedene Möglichkeiten, ein nachgiebiges Material auf dem bogenförmigen Siebdruckzylindermaterial oder in den Öffnungen des bogenförmigen Siebdruckzylindermaterials in Schritt c) des erfindungsgemäßen Verfahrens zu befestigen. In Variante 5a) befestigt man das nachgiebige Material des Oberflächenelements (6), zum Beispiel durch Kleben, auf den Rändern der Öffnungen des bogenförmigen Siebdruckzylindermaterials, welches später den Zylindermantel (5) bildet. In Variante 5b) befestigt man zusätzlich ein nachgiebiges Material des Oberflächenelements (6) von der anderen Seite auf dem bogenförmigen Siebdruckzylindermaterial. In Variante 5c) stellt man keine Öffnung im bogenförmigen Siebdruckzylindermaterial her. In dieser Ausführungsform befestigt man das nachgiebige Material des Oberflächenelements (6) direkt auf dem bogenförmigen Siebdruckzylindermaterial, beispielsweise durch Kleben.Figur 5
-
Figure 1 shows a printing system according to the invention. The screen printing cylinder (1) has four flexible surface elements (6) which are arranged in a row parallel to the cylinder axis of the screen printing cylinder (1) (shown on the side). The impression cylinder (2) transports a sheet (10) of the printing material, for example paper, which is held by a pair of sheet grippers (4). The squeegee (9) has not yet disengaged. The screen printing cylinder (1) and the impression cylinder (2) are matched to one another in such a way that the flexible surface elements (6) of the screen printing cylinder (1) when the two cylinders (1, 2) rotate continuously over the two pairs of sheet grippers (4) of the impression cylinder ( 2) come to rest. -
Figure 2 shows the same printing system as inFigure 1 wherein the sheet guiding pair of sheet grippers (4) and the resilient surface elements (6) come into contact with one another. The squeegee (9) is disengaged. Because of the resilient property of the surface elements (6), the surface elements (6) are curved inward when they come into contact with the pair of sheet grippers (4). After the end of the contact, the surface elements (6) bulge back into their starting position (not shown). -
Figure 3 shows a screen printing cylinder (1) according to the invention. This has three flexible surface elements (6) on its cylinder jacket (5). The surface elements (6) are arranged in a row parallel to the cylinder axis (7) of the screen printing cylinder (1). -
Figure 4 shows a screen printing cylinder (1) according to the invention, which has only one flexible surface element (6) which extends over the entire length of the cylinder. -
Figure 5 shows various possibilities of attaching a flexible material on the arch-shaped screen printing cylinder material or in the openings of the arch-shaped screen printing cylinder material in step c) of the method according to the invention. In variant 5a), the flexible material of the surface element (6) is attached, for example by gluing, to the edges of the openings in the arched screen printing cylinder material, which later forms the cylinder jacket (5). In variant 5b), a flexible material of the surface element (6) is additionally fastened from the other side on the arched screen printing cylinder material. In variant 5c), no opening is made in the arched screen printing cylinder material. In this embodiment, the flexible material of the surface element (6) is attached directly to the arch-shaped screen printing cylinder material, for example by gluing.
- 11
- SiebdruckzylinderScreen printing cylinder
- 22
- GegendruckzylinderImpression cylinder
- 33
- Zylindermantel des GegendruckzylindersCylinder jacket of the impression cylinder
- 44th
- BogengreiferSheet gripper
- 55
- Zylindermantel des SiebdruckzylindersCylinder jacket of the screen printing cylinder
- 66th
- nachgiebiges Oberflächenelementcompliant surface element
- 77th
- Zylinderachse des SiebdruckzylindersCylinder axis of the screen printing cylinder
- 99
- RakelSqueegee
- 1010
- Bogenarc
Claims (10)
dadurch gekennzeichnet,
dass der Siebdruckzylinder (1) auf seinem Zylindermantel (5) ein oder mehrere nachgiebige Oberflächenelemente (6) aufweist, welche mit den ein oder mehreren aus dem Zylindermantel (3) des Gegendruckzylinders (2) herausstehenden Oberflächenelementen (4) zusammenwirken.Printing system for rotary screen printing, comprising a screen printing cylinder (1) and an impression cylinder (2) which interacts with the screen printing cylinder (1) and has one or more surface elements (4) protruding from its cylinder jacket (3),
characterized,
that the screen printing cylinder (1) has one or more flexible surface elements (6) on its cylinder jacket (5) which interact with the one or more surface elements (4) protruding from the cylinder jacket (3) of the impression cylinder (2).
Applications Claiming Priority (1)
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DE102019216458.7A DE102019216458A1 (en) | 2019-10-25 | 2019-10-25 | Printing system for rotary screen printing, comprising a screen printing cylinder with resilient surface elements |
Publications (1)
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EP3812155A1 true EP3812155A1 (en) | 2021-04-28 |
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ID=72801312
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EP20200439.6A Pending EP3812155A1 (en) | 2019-10-25 | 2020-10-07 | Printing system for rotary screen printing comprising a screen printing cylinder with flexible surface elements |
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US (2) | US11559978B2 (en) |
EP (1) | EP3812155A1 (en) |
JP (1) | JP2021066180A (en) |
CN (1) | CN112706506B (en) |
DE (1) | DE102019216458A1 (en) |
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US11559978B2 (en) | 2023-01-24 |
US20230001685A1 (en) | 2023-01-05 |
US11712884B2 (en) | 2023-08-01 |
CN112706506B (en) | 2023-02-14 |
US20210122151A1 (en) | 2021-04-29 |
JP2021066180A (en) | 2021-04-30 |
CN112706506A (en) | 2021-04-27 |
DE102019216458A1 (en) | 2021-04-29 |
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