EP0554542A1 - Offset printing element - Google Patents

Offset printing element Download PDF

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Publication number
EP0554542A1
EP0554542A1 EP92120894A EP92120894A EP0554542A1 EP 0554542 A1 EP0554542 A1 EP 0554542A1 EP 92120894 A EP92120894 A EP 92120894A EP 92120894 A EP92120894 A EP 92120894A EP 0554542 A1 EP0554542 A1 EP 0554542A1
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EP
European Patent Office
Prior art keywords
printing form
offset printing
forme cylinder
register
beginning
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.)
Granted
Application number
EP92120894A
Other languages
German (de)
French (fr)
Other versions
EP0554542B1 (en
Inventor
Eduard Hoffmann
Johann Winterholler
Wolfgang Prem
Herbert Stöckl
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Manroland AG
Original Assignee
MAN Roland Druckmaschinen AG
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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
    • B41N1/16—Curved printing plates, especially cylinders
    • B41N1/20—Curved printing plates, especially cylinders made of metal or similar inorganic compounds, e.g. plasma coated ceramics, carbides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F27/00—Devices for attaching printing elements or formes to supports
    • B41F27/005—Attaching and registering printing formes to supports
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F27/00—Devices for attaching printing elements or formes to supports
    • B41F27/12—Devices for attaching printing elements or formes to supports for attaching flexible printing formes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F27/00—Devices for attaching printing elements or formes to supports
    • B41F27/12—Devices for attaching printing elements or formes to supports for attaching flexible printing formes
    • B41F27/1212—Devices for attaching printing elements or formes to supports for attaching flexible printing formes using pneumatic force
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S101/00—Printing
    • Y10S101/36—Means for registering or alignment of print plates on print press structure
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49544—Roller making
    • Y10T29/49547—Assembling preformed components
    • Y10T29/49558—Includes securing removable cover on roller

Definitions

  • the invention relates to an offset printing form made of a metallic material for a forme cylinder of a printing press and a method for producing such an offset printing form.
  • the most common forms of printing in offset printing are the pre-coated aluminum plates, the great advantage of which is the simplicity and speed of manufacture, or the multi-metal plates, which mostly consist of three metals (trimetal), generally using aluminum or sheet steel as the carrier metal. These types are particularly suitable for larger print runs and high loads. In addition, their good surface properties can be significantly improved by additional anodization.
  • this printing form has fitting bores on two opposite edges for the fitting pins of a clamping device of the printing form cylinder.
  • the printing form is centered on the dowel pins and hooked into a cylinder channel with the leading edge, which was previously bent over.
  • the end of the printing form is also inserted into the cylinder channel so that the printing form can be clamped.
  • This requires a channel across the cylinder width and clamping segments that extend through the cylinder in the channel.
  • the printing forms begin and end in this area. This interruption of the printing form means that endless images cannot be produced.
  • the printing speed is limited due to vibration loads on the cylinder through the channel and the clamping device. This vibration exposure also affects print quality.
  • the object of the present invention is to improve the print quality achieved by a generic printing form by eliminating the above-mentioned vibration load and at the same time allowing a higher rotational speed of the printing form cylinder.
  • This object is achieved in the printing form according to the invention from a metallic material in that the beginning and end of the plate-shaped blank of the offset printing form are connected to one another in such a way that the offset printing form, in the form of a sleeve, coats frictionally in the working position but releasably encases the form cylinder , so that it has a coherent, channel-free outer surface and that register devices are provided on at least one end face to ensure the circumferential and lateral register stability.
  • This offset printing form produced by the method according to the invention can be used in conjunction with a forme cylinder without a channel and clamping segment, which is known, for example, from German patent DE-PS 27 00 118.
  • the offset printing form can be pushed onto the form cylinder using compressed air. In the working position, it is non-displaceable on the forme cylinder, yet it can be easily removed from it without destroying it and can therefore be reused.
  • the use of conventional printing form clamping devices, the channel and clamping segments are no longer required and can thus be saved. Only register devices are required to apply the printing form in accordance with the register.
  • Known devices such as markings on the surface of the forme cylinder, which are brought into line with markings on the thin offset printing form, or register pins of the form cylinder, into which the printing form can be hung in register, can also be used here.
  • commercially available offset printing plates can be used and previous plate copies can be used unchanged.
  • the channelless printing enables inexpensive cylinder production, an improvement in print quality and higher print speeds.
  • a thin offset printing form 1 with a thickness s of approximately 0.3 mm is formed from a metallic material to form a sleeve with a diameter d of approximately 300 mm and a width l of approximately 1,600 mm.
  • the material can be aluminum or a multi-metal or tri-metal.
  • the beginning and end of offset printing form 1 are longitudinally welded together.
  • the weld seam 2 preferably has a width b of approximately 0.7 mm.
  • the weld seam 2 has a concave shape on its top and bottom, so that it is not noticeable on the print.
  • Printing form 1 thus has a coherent, channel-free outer surface.
  • the printing form 1 On one end face 3 (FIG. 3), the printing form 1 is provided with register devices in the form of fitting bores 4 which interact with register pins on the surface of the forme cylinder.
  • FIG. 4 shows, it is also conceivable to provide recesses 6 on both end faces 3, 5, which also cooperate with register pins on the surface of the forme cylinder.
  • the production process for printing form 1 comprises the following steps.
  • a plate is cut to the size corresponding to the circumference and width of the forme cylinder.
  • At least one end face 3 or 5 is provided with register devices 4, 6 by means of a plate punch.
  • the plate-shaped blank is clamped in register in the form of a sleeve in a welding device and the beginning and end of the printing form 1 are welded lengthwise. This is preferably done using a neodymium-YAG laser.
  • the regulation of the laser power and the possibility of continuous and pulsed operating mode allow a controlled and exactly reproducible energy influence on the printing form 1. Heat load and warpage of the weld metal are extremely low in comparison with other thermal processes.
  • the welding process is carried out in such a way that a weld seam 2 is formed which has a concave shape on the top and bottom.
  • the sleeve-like printing forme 1 is then pushed onto the forme cylinder while expanding by means of compressed air.
  • the removal of the compressed air causes the printing form to adhere positively to the forme cylinder.
  • the coating and exposure of the printing form 1 can be carried out on the one hand before the beginning and end of the printing form 1 outside the printing machine by photochemical means, and on the other hand after the sleeve-shaped printing form 1 has been pushed on by coating and exposing the printing form on the form cylinder all around.
  • the principle of the invention is therefore to form a commercially available pressure plate made of a metallic material for the purpose of channelless printing into a sleeve, which frictionally and register-wise in the working position, but releasably and reusably encased the forme cylinder and thus has a coherent channel-free outer surface.
  • the invention is not limited to a printing form which is formed into a sleeve by means of a weld seam. It is also conceivable to establish the connection between the beginning and end of the printing form by means of an adhesive, for example the beginning of the printing form being glued to half of a longitudinal saddle, the end of the printing form glued to the other half of the longitudinal saddle and the joints from the beginning and end are additionally glued. Then the sleeve-shaped printing form together with the saddle is pushed onto the forme cylinder.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Printing Plates And Materials Therefor (AREA)
  • Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)
  • Manufacture Or Reproduction Of Printing Formes (AREA)

Abstract

Bei einer Offset-Druckform aus einem metallischen Werkstoff für einen Formzylinder einer Druckmaschine ist Anfang und Ende derselben derart miteinander verbunden, so daß die Offset-Druckform zusammenhängend in Form einer Hülse reibschlüssig in der Arbeitsstellung, jedoch lösbar und wiederverwendbar den Formzylinder ummantelt. Die Offset-Druckform verfügt über eine zusammenhängende kanalfreie Außenfläche und ist mit Registereinrichtungen an mindestens einer Stirnseite zur Sicherstellung der umfangs- und seitenmäßigen Registerhaltigkeit versehen. <IMAGE>In the case of an offset printing form made of a metallic material for a forme cylinder of a printing machine, the beginning and end of the printing machine are connected to one another such that the offset printing form is coherently encased in the working position in the form of a sleeve, but is releasably and reusably encased in the form cylinder. The offset printing form has a coherent, channel-free outer surface and is provided with register devices on at least one end face to ensure the circumferential and lateral registration. <IMAGE>

Description

Die Erfindung betrifft eine Offset-Druckform aus einem metallischen Werkstoff für einen Formzylinder einer Druckmaschine und ein Verfahren zur Herstellung einer solchen Offset-Druckform.The invention relates to an offset printing form made of a metallic material for a forme cylinder of a printing press and a method for producing such an offset printing form.

Die im Offsetdruck am meisten verwendeten Druckformarten sind die vorbeschichteten Aluminiumplatten, deren großer Vorteil die Einfachheit und Schnelligkeit der Herstellung ist, oder die Mehrmetallplatten, die meistens aus drei Metallen (Trimetall) bestehen, wobei im allgemeinen Aluminium oder Stahlblech als Trägermetall verwendet wird. Diese Arten eignen sich im besonderen Maße für höhere Auflagenbereiche und große Beanspruchung. Außerdem lassen sich ihre guten Oberflächeneigenschaften durch eine zusätzliche Anodisierung noch erheblich verbessern.The most common forms of printing in offset printing are the pre-coated aluminum plates, the great advantage of which is the simplicity and speed of manufacture, or the multi-metal plates, which mostly consist of three metals (trimetal), generally using aluminum or sheet steel as the carrier metal. These types are particularly suitable for larger print runs and high loads. In addition, their good surface properties can be significantly improved by additional anodization.

In der Regel weist diese Druckform an zwei gegenüberliegenden Kanten Paßbohrungen für die Paßstifte einer Einspannvorrichtung des Druckformzylinders auf. Die Druckform wird auf den Paßstiften zentriert und mit der vorlaufenden Kante, die vorher umgebogen wurde, in einen Zylinderkanal eingehängt. Auch das Druckformende wird in den Zylinderkanal eingeschoben, so daß die Druckform eingespannt werden kann. Dazu werden ein Kanal über die Zylinderbreite und Spannsegmente, die sich im Kanal durch den Zylinder erstrecken, benötigt. In diesem Bereich beginnen und enden die Druckformen. Durch diese Druckformunterbrechung können endlose Bilder nicht hergestellt werden. Darüber hinaus ist aufgrund von Schwingungsbelastungen des Zylinders durch den Kanal und die Einspannvorrichtung die Druckgeschwindigkeit begrenzt. Diese Schwingungsbelastung beeinträchtigt auch die Druckqualität.As a rule, this printing form has fitting bores on two opposite edges for the fitting pins of a clamping device of the printing form cylinder. The printing form is centered on the dowel pins and hooked into a cylinder channel with the leading edge, which was previously bent over. The end of the printing form is also inserted into the cylinder channel so that the printing form can be clamped. This requires a channel across the cylinder width and clamping segments that extend through the cylinder in the channel. The printing forms begin and end in this area. This interruption of the printing form means that endless images cannot be produced. In addition, the printing speed is limited due to vibration loads on the cylinder through the channel and the clamping device. This vibration exposure also affects print quality.

Aufgabe der vorliegenden Erfindung ist es, die von einer gattungsbildenden Druckform erreichte Druckqualität zu verbessern, indem die oben genannte Schwingungsbelastung beseitigt wird und gleichzeitig eine höhere Umlaufgeschwindigkeit des Druckformzylinders zu ermöglichen.The object of the present invention is to improve the print quality achieved by a generic printing form by eliminating the above-mentioned vibration load and at the same time allowing a higher rotational speed of the printing form cylinder.

Diese Aufgabe wird bei der erfindungsgemäßen Druckform aus einem metallischen Werkstoff dadurch gelöst, daß Anfang und Ende des plattenförmigen Zuschnitts der Offset-Druckform derart miteinander verbunden sind, so daß die Offset-Druckform zusammenhängend in Form einer Hülse reibschlüssig in der Arbeitsstellung jedoch lösbar den Formzylinder ummantelt, so daß sie über eine zusammenhängende kanalfreie Außenfläche verfügt und daß Registereinrichtungen mindestens an einer Stirnseite zur Sicherstellung der umfangs- und seitenmäßigen Registerhaltigkeit vorgesehen sind.This object is achieved in the printing form according to the invention from a metallic material in that the beginning and end of the plate-shaped blank of the offset printing form are connected to one another in such a way that the offset printing form, in the form of a sleeve, coats frictionally in the working position but releasably encases the form cylinder , so that it has a coherent, channel-free outer surface and that register devices are provided on at least one end face to ensure the circumferential and lateral register stability.

Diese durch das erfindungsgemäße Verfahren hergestellte Offset-Druckform ist in Verbindung mit einem kanal- und spannsegmentlosen Formzylinder, der zum Beispiel aus der deutschen Patentschrift DE-PS 27 00 118 bekannt ist, einsetzbar. Die Offset-Druckform ist unter Ausnutzung von Druckluft auf den Formzylinder aufschiebbar. In der Arbeitsstellung verschiebefest auf dem Formzylinder ist sie dennoch leicht zerstörungsfrei von diesem lösbar und somit wiederverwendbar. Die Verwendung herkömmlicher Druckformklemmeinrichtungen, die Kanal- und Spannsegmente sind nicht mehr erforderlich und können somit eingespart werden. Es sind lediglich nur noch Registereinrichtungen zum registergerechten Aufbringen der Druckform erforderlich. Auch hier kann auf bekannte Einrichtungen, wie zum Beispiel Markierungen auf der Formzylinderoberfläche, die mit Markierungen auf der dünnen Offset-Druckform in Übereinstimmung gebracht werden, oder in vorteilhafter Weise Registerstifte des Formzylinders, in die die Druckform registerhaltig einhängbar ist, zurückgegriffen werden. Außerdem können handelsübliche Offset-Druckplatten verwendet werden und bisherige Plattenkopien unverändert weiterverwendet werden. Der kanallose Druck erlaubt eine kostengünstige Zylinderfertigung, eine Verbesserung der Druckqualität und höhere Druckgeschwindigkeiten.This offset printing form produced by the method according to the invention can be used in conjunction with a forme cylinder without a channel and clamping segment, which is known, for example, from German patent DE-PS 27 00 118. The offset printing form can be pushed onto the form cylinder using compressed air. In the working position, it is non-displaceable on the forme cylinder, yet it can be easily removed from it without destroying it and can therefore be reused. The use of conventional printing form clamping devices, the channel and clamping segments are no longer required and can thus be saved. Only register devices are required to apply the printing form in accordance with the register. Known devices, such as markings on the surface of the forme cylinder, which are brought into line with markings on the thin offset printing form, or register pins of the form cylinder, into which the printing form can be hung in register, can also be used here. In addition, commercially available offset printing plates can be used and previous plate copies can be used unchanged. The channelless printing enables inexpensive cylinder production, an improvement in print quality and higher print speeds.

Im folgenden ist ein Ausführungsbeispiel anhand der Zeichnung beschrieben. Es zeigt stark schematisiert

Fig. 1
eine perspektivische Ansicht einer hülsenförmigen Offset-Druckform;
Fig. 2
eine Detailansicht eines Querschnittes der Offset-Druckform gemäß Fig. 1 mit einer Schweißnaht;
Fig. 3
eine Offset-Druckform mit einer ersten Registereinrichtung;
Fig. 4
eine Offset-Druckform mit einer zweiten Registereinrichtung.
An exemplary embodiment is described below with reference to the drawing. It shows highly schematic
Fig. 1
a perspective view of a sleeve-shaped offset printing form;
Fig. 2
a detailed view of a cross section of the offset printing form according to Figure 1 with a weld.
Fig. 3
an offset printing form with a first register device;
Fig. 4
an offset printing form with a second register device.

In Fig. 1 ist eine dünne Offset-Druckform 1 mit einer Dicke s von ca. 0,3 mm aus einem metallischen Werkstoff zu einer Hülse mit einem Durchmesser d von ca. 300 mm und einer Breite l von ca. 1.600 mm geformt. Der Werkstoff kann Aluminium oder ein Mehrmetall, beziehungsweise Trimetall sein. Anfang und Ende der Offset-Druckform 1 sind miteinander längsverschweißt. Die Schweißnaht 2 weist vorzugsweise eine Breite b von ca. 0,7 mm auf.In Fig. 1, a thin offset printing form 1 with a thickness s of approximately 0.3 mm is formed from a metallic material to form a sleeve with a diameter d of approximately 300 mm and a width l of approximately 1,600 mm. The material can be aluminum or a multi-metal or tri-metal. The beginning and end of offset printing form 1 are longitudinally welded together. The weld seam 2 preferably has a width b of approximately 0.7 mm.

Wie Fig. 2 zeigt, weist die Schweißnaht 2 an ihrer Ober- und Unterseite eine konkave Form auf, so daß sie sich auf dem Druck nicht bemerkbar macht. Die Druckform 1 verfügt somit über eine zusammenhängende kanalfreie Außenfläche. An einer Stirnseite 3 (Fig. 3) ist die Druckform 1 mit Registereinrichtungen in Form von Paßbohrungen 4 versehen, die mit Registerstiften auf der Formzylinderoberfläche zusammenwirken. Wie Fig. 4 zeigt ist es auch denkbar, an beiden Stirnseiten 3, 5 Ausnehmungen 6 vorzusehen, die ebenfalls mit Registerstiften auf der Formzylinderoberfläche zusammenwirken.As shown in FIG. 2, the weld seam 2 has a concave shape on its top and bottom, so that it is not noticeable on the print. Printing form 1 thus has a coherent, channel-free outer surface. On one end face 3 (FIG. 3), the printing form 1 is provided with register devices in the form of fitting bores 4 which interact with register pins on the surface of the forme cylinder. As FIG. 4 shows, it is also conceivable to provide recesses 6 on both end faces 3, 5, which also cooperate with register pins on the surface of the forme cylinder.

Das Herstellungsverfahren der erfindungsgemäßen Druckform 1 umfaßt folgende Schritte. Eine Platte wird auf das dem Umfang und der Breite des Formzylinders entsprechende Maß zugeschnitten. Mindestens eine Stirnseite 3 oder 5 wird mit Registereinrichtungen 4, 6 mittels einer Plattenstanze versehen. Der plattenförmige Zuschnitt wird registerhaltig in Form einer Hülse in eine Schweißvorrichtung eingespannt und Anfang und Ende der Druckform 1 längsverschweißt. Dies wird vorzugsweise mittels eines Neodym-YAG-Lasers vorgenommen. Die Regelung der Laserleistung und die Möglichkeit zur kontinuierlichen und gepulsten Betriebsform erlauben eine kontrollierte und exakt reproduzierbare Energieeinwirkung auf die Druckform 1. Wärmebelastung und Verzug des Schweißgutes sind im Vergleich mit anderen thermischen Verfahren äußerst gering. Der Schweißprozeß wird so geführt, daß eine Schweißnaht 2 entsteht, die an der Ober- und Unterseite eine konkave Form aufweist. Die hülsenförmige Druckform 1 wird anschließend unter Aufweiten mittels Druckluft auf den Formzylinder aufgeschoben. Die Wegnahme der Druckluft bewirkt eine formschlüssige Anhaftung der Druckform auf den Formzylinder. Das Beschichten und Belichten der Druckform 1 kann einerseits vor dem Verbinden von Anfang und Ende der Druckform 1 außerhalb der Druckmaschine auf fotochemischem Wege, andererseits nach dem Aufschieben der hülsenförmigen Druckform 1, indem die Druckform auf dem Formzylinder rundum beschichtet und belichtet wird, vorgenommen werden.The production process for printing form 1 according to the invention comprises the following steps. A plate is cut to the size corresponding to the circumference and width of the forme cylinder. At least one end face 3 or 5 is provided with register devices 4, 6 by means of a plate punch. The plate-shaped blank is clamped in register in the form of a sleeve in a welding device and the beginning and end of the printing form 1 are welded lengthwise. This is preferably done using a neodymium-YAG laser. The regulation of the laser power and the possibility of continuous and pulsed operating mode allow a controlled and exactly reproducible energy influence on the printing form 1. Heat load and warpage of the weld metal are extremely low in comparison with other thermal processes. The welding process is carried out in such a way that a weld seam 2 is formed which has a concave shape on the top and bottom. The sleeve-like printing forme 1 is then pushed onto the forme cylinder while expanding by means of compressed air. The removal of the compressed air causes the printing form to adhere positively to the forme cylinder. The coating and exposure of the printing form 1 can be carried out on the one hand before the beginning and end of the printing form 1 outside the printing machine by photochemical means, and on the other hand after the sleeve-shaped printing form 1 has been pushed on by coating and exposing the printing form on the form cylinder all around.

Das Prinzip der Erfindung besteht also darin, eine handelsübliche Druckplatte aus einem metallischen Werkstoff zum Zwecke eines kanallosen Druckes zu einer Hülse zu formen, die reibschlüssig und registerhaltig in der Arbeitsstellung, jedoch lösbar und wiederverwendbar den Formzylinder ummantelt und so über eine zusammenhängende kanalfreie Außenfläche verfügt. So ist die Erfindung nicht allein auf eine mittels einer Schweißnaht zu einer Hülse geformten Druckform beschränkt. Es ist auch denkbar die Verbindung von Anfang und Ende der Druckform mittels einer Verklebung herzustellen, wobei z.B. der Anfang der Druckform auf eine Hälfte eines längsverlaufenden Sattels geklebt wird, das Ende der Druckform auf die andere Hälfte des längs verlaufenden Sattels geklebt und zusätzlich die Stoßstellen von Anfang und Ende zusätzlich verklebt werden. Anschließend wird die hülsenförmige Druckform mitsamt dem Sattel auf den Formzylinder geschoben.The principle of the invention is therefore to form a commercially available pressure plate made of a metallic material for the purpose of channelless printing into a sleeve, which frictionally and register-wise in the working position, but releasably and reusably encased the forme cylinder and thus has a coherent channel-free outer surface. Thus, the invention is not limited to a printing form which is formed into a sleeve by means of a weld seam. It is also conceivable to establish the connection between the beginning and end of the printing form by means of an adhesive, for example the beginning of the printing form being glued to half of a longitudinal saddle, the end of the printing form glued to the other half of the longitudinal saddle and the joints from the beginning and end are additionally glued. Then the sleeve-shaped printing form together with the saddle is pushed onto the forme cylinder.

Claims (12)

Offset-Druckform aus einem metallischen Werkstoff für einen Formzylinder einer Druckmaschine, dadurch gekennzeichnet, daß Anfang und Ende der Offset-Druckform (1) derart miteinander verbunden sind, so daß die Offset-Druckform (1) zusammenhängend in Form einer Hülse reibschlüssig in der Arbeitsstellung, jedoch lösbar den Formzylinder ummantelt und über eine zusammenhängende, kanalfreie Außenfläche verfügt und daß Registereinrichtungen (4, 6) an mindestens einer Stirnseite (3, 5) zur Sicherstellung der umfangs- und seitenmäßigen Registerhaltigkeit vorgesehen sind.Offset printing form made of a metallic material for a forme cylinder of a printing machine, characterized in that the beginning and end of the offset printing form (1) are connected to one another in such a way that the offset printing form (1) is frictionally connected in the working position in the form of a sleeve , however, releasably encased the forme cylinder and has a coherent, channel-free outer surface and that register devices (4, 6) are provided on at least one end face (3, 5) to ensure the circumferential and lateral register stability. Offset-Druckform nach Anspruch 1, dadurch gekennzeichnet, daß Anfang und Ende der Offset-Druckform (1) mittels einer Schweißnaht (2) verbunden sind.Offset printing form according to claim 1, characterized in that the beginning and end of the offset printing form (1) are connected by means of a weld seam (2). Offset-Druckform nach Anspruch 1, dadurch gekennzeichnet, daß Anfang und Ende der Offset-Druckform (1) mittels einer Verklebung, wobei der Anfang der Druckform (1) auf eine Hälfte eines längsverlaufenden Sattels geklebt und das Ende der Druckform (1) auf die andere Hälfte des Sattels geklebt ist, verbunden sind.Offset printing form according to claim 1, characterized in that the beginning and end of the offset printing form (1) by means of gluing, the beginning of the printing form (1) being glued to one half of a longitudinal saddle and the end of the printing form (1) on the other half of the saddle is glued, connected. Offset-Druckform nach Anspruch 1, dadurch gekennzeichnet, daß der Werkstoff Aluminium ist.Offset printing form according to claim 1, characterized in that the material is aluminum. Offset-Druckform nach Anspruch 1, dadurch gekennzeichnet, daß der Werkstoff ein Mehrmetall ist.Offset printing form according to claim 1, characterized in that the material is a multi-metal. Offset-Druckform nach Anspruch 1, dadurch gekennzeichnet, daß die Registereinrichtungen in Form von Paßlochungen (4) ausgebildet sind, die mit Registerstiften auf der Formzylinderoberfläche zusammenwirken.Offset printing form according to claim 1, characterized in that the register devices are designed in the form of fitting holes (4) which interact with register pins on the surface of the forme cylinder. Offset-Druckform nach Anspruch 1, dadurch gekennzeichnet, daß die Registereinrichtungen in Form von Ausnehmungen (6) an beiden Stirnseiten (3, 5) der Druckform (1) ausgebildet sind, die mit Registerstiften auf der Formzylinderoberfläche zusammenwirken.Offset printing form according to claim 1, characterized in that the register devices are designed in the form of recesses (6) on both end faces (3, 5) of the printing form (1) which cooperate with register pins on the surface of the forme cylinder. Verfahren zur Herstellung einer Offset-Druckform aus einem metallischen Werkstoff für einen Formzylinder einer Druckmaschine, dadurch gekennzeichnet, daß eine Platte auf das dem Umfang und der Breite des Formzylinders entsprechende Maß zugeschnitten wird und an mindestens einer Stirnseite (3, 5) mit Registereinrichtungen (4, 6) versehen wird, daß der plattenförmige Zuschnitt auf herkömmliche Art beschichtet und belichtet wird, registerhaltig in Form einer Hülse in eine Schweißvorrichtung eingespannt wird, daß Anfang und Ende der Druckform (1) längsnahtverschweißt werden, wobei der Schweißprozeß so geführt wird, daß eine Schweißnaht (2) entsteht, die an Ober- und Unterseite eine konkave Form aufweist und daß die hülsenförmige Druckform (1) unter Aufweiten mittels Druckluft auf den Formzylinder aufgeschoben wird.Method for producing an offset printing form from a metallic material for a forme cylinder of a printing press, characterized in that a plate is cut to the size corresponding to the circumference and the width of the forme cylinder and on at least one end face (3, 5) with register devices (4 , 6) is provided that the plate-shaped blank is coated and exposed in a conventional manner, is held in register in the form of a sleeve in a welding device, that the beginning and end of the printing form (1) are welded longitudinally, the welding process being carried out so that a Weld seam (2) is formed, which has a concave shape on the top and bottom and that the sleeve-shaped printing form (1) is pushed onto the form cylinder while expanding by means of compressed air. Verfahren zur Herstellung einer Offset-Druckform aus einem metallischen Werkstoff für einen Formzylinder einer Druckmaschine, dadurch gekennzeichnet, daß eine Platte auf das dem Umfang und der Breite des Formzylinders entsprechende Maß zugeschnitten wird und an den Stirnseiten (3, 5) mit Registereinrichtungen (4, 6) versehen wird, daß der plattenförmige Zuschnitt in Form einer Hülse in eine Schweißvorrichtung eingespannt wird, daß Anfang und Ende der Platte längsnahtverschweißt werden, wobei der Schweißprozeß so geführt wird, daß eine Schweißnaht (2) entsteht, die an Ober- und Unterseite eine konkave Form aufweist, daß die hülsenförmige Druckform (1) unter Aufweiten mittels eines Druckluft auf den Formzylinder aufgeschoben wird und daß die Druckform (1) im festen Sitz auf dem Formzylinder rundum beschichtet und belichtet wird.Method for producing an offset printing form from a metallic material for a forme cylinder of a printing machine, characterized in that a plate is cut to the size corresponding to the circumference and the width of the forme cylinder and on the end faces (3, 5) with register devices (4, 6) is provided that the plate-shaped blank is clamped in the form of a sleeve in a welding device, that the beginning and end of the plate are longitudinally welded, the welding process being carried out in such a way that a weld seam (2) is formed which has a top and bottom side has a concave shape, that the sleeve-shaped printing form (1) is pushed onto the forme cylinder while being expanded by means of compressed air and that the printing form (1) is coated and exposed all around in a tight fit on the form cylinder. Verfahren nach Anspruch 8 oder 9, dadurch gekennzeichnet, daß der plattenförmige Zuschnitt mittels einer Plattenstanze mit Paßlochungen (4) als Registereinrichtungen versehen wird.A method according to claim 8 or 9, characterized in that the plate-shaped blank is provided with fitting holes (4) as register devices by means of a plate punch. Verfahren nach Anspruch 8 oder 9, dadurch gekennzeichnet, daß für den Schweißprozeß ein Neodym-YAG-Laser verwendet wird.Method according to claim 8 or 9, characterized in that a neodymium-YAG laser is used for the welding process. Verfahren zur Herstellung einer Offset-Druckform aus einem metallischen Werkstoff für einen Formzylinder einer Druckmaschine, dadurch gekennzeichnet, daß eine Platte auf das den Umfang und der Breite des Formzylinders entsprechende Maß zugeschnitten wird, Markierungen am Anfang und Ende der Druckform an mindestens einer Stirnseite angebracht werden, der Anfang der Druckform auf eine Hälfte eines längs verlaufenden Sattels, das Ende der Druckform (1) auf die andere Hälfte des Sattels registergerecht geklebt wird und die Druckform mitsamt dem Sattel auf den Formzylinder geschoben wird.Process for producing an offset printing form from a metallic material for a forme cylinder of a printing machine, characterized in that a plate is cut to the size corresponding to the circumference and width of the forme cylinder, markings are attached to at least one end face at the beginning and end of the printing form , the beginning of the printing form on one half of a longitudinal saddle, the end of the printing form (1) on the other half of the saddle is glued in register and the printing form together with the saddle is pushed onto the forme cylinder.
EP92120894A 1991-12-11 1992-12-08 Offset printing element Expired - Lifetime EP0554542B1 (en)

Applications Claiming Priority (2)

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DE4140768 1991-12-11
DE4140768A DE4140768C2 (en) 1991-12-11 1991-12-11 Offset printing form

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EP0554542A1 true EP0554542A1 (en) 1993-08-11
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JP (1) JP3272427B2 (en)
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DE (2) DE4140768C2 (en)

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Also Published As

Publication number Publication date
CA2083682A1 (en) 1993-06-12
EP0554542B1 (en) 1996-04-10
DE59205967D1 (en) 1996-05-15
CA2083682C (en) 1996-10-29
JP3272427B2 (en) 2002-04-08
DE4140768A1 (en) 1993-06-17
US5379693A (en) 1995-01-10
JPH05254096A (en) 1993-10-05
DE4140768C2 (en) 1994-08-18

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