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EP0425982A2 - Plate cylinder - Google Patents

Plate cylinder Download PDF

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Publication number
EP0425982A2
EP0425982A2 EP90120305A EP90120305A EP0425982A2 EP 0425982 A2 EP0425982 A2 EP 0425982A2 EP 90120305 A EP90120305 A EP 90120305A EP 90120305 A EP90120305 A EP 90120305A EP 0425982 A2 EP0425982 A2 EP 0425982A2
Authority
EP
European Patent Office
Prior art keywords
plate cylinder
plate
foils
cylinder
printing plate
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
EP90120305A
Other languages
German (de)
French (fr)
Other versions
EP0425982A3 (en
EP0425982B1 (en
Inventor
Claus Simeth
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 Miller Druckmaschinen GmbH
MAN Roland Druckmaschinen AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by MAN Miller Druckmaschinen GmbH, MAN Roland Druckmaschinen AG filed Critical MAN Miller Druckmaschinen GmbH
Publication of EP0425982A2 publication Critical patent/EP0425982A2/en
Publication of EP0425982A3 publication Critical patent/EP0425982A3/en
Application granted granted Critical
Publication of EP0425982B1 publication Critical patent/EP0425982B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B41N6/00—Mounting boards; Sleeves Make-ready devices, e.g. underlays, overlays; Attaching by chemical means, e.g. vulcanising
    • 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

Definitions

  • the invention relates to a plate cylinder of a printing press with a printing plate stretched over its circumference and with a film arrangement provided between the plate cylinder and the printing plate.
  • a pad is conventionally arranged, which consists for example of oil paper.
  • this known arrangement is still distinguished by a very high frictional force between the actual plate cylinder and the printing plate, which is particularly due to the fact that the rough surface of the plate cylinder rests on the relatively rough surface of the oil paper and also the rough underside of the printing plate the roughness of the upper side of the underlay which is provided with the same roughness as the underside.
  • a pressure plate is tightened via the tensioning strip, a force arrives at the pressure end at the start of the pressure of the pressure plate, which is only approximately one fifth of the force at the pressure end of the pressure plate. The remaining force is friction losses.
  • a force is applied to the tension bar at the start of the pressure, which is approximately equal to 0.6 times the force at the end of the print.
  • the rest i.e. around 40% of the force, is used up by the friction.
  • the invention avoids these disadvantages. It is based on the object of proposing a plate cylinder with the features mentioned at the outset, which is distinguished by a noticeably reduced coefficient of friction between the plate cylinder and the printing plate.
  • the invention is characterized in that the foil arrangement has at least two foils, one surface of which has a smaller coefficient of sliding friction than the other surface, the two foils having their surfaces with good sliding properties being superimposed on one another.
  • the lower film with its higher coefficient of sliding friction thus lies on the top of the plate cylinder and the upper film lies with its side with the higher coefficient of sliding friction on the underside of the printing plate.
  • Both films lie on top of each other with their well sliding surfaces and allow the printing plate to be moved relative to the plate cylinder with low sliding friction, i.e. smooth sliding.
  • the foil arrangement can be supplemented by additional foils, for example by prior art underlay sheets between the top of the described foils and the underside of the printing plate and / or between the plate cylinder and the bottom of the foils described.
  • additional foils for example by prior art underlay sheets between the top of the described foils and the underside of the printing plate and / or between the plate cylinder and the bottom of the foils described.
  • the circumference of the plate cylinder can be increased, for example. All of this is encompassed by the invention.
  • foils when we speak of foils above and below, this includes flat, flexible structures in the broadest sense, for example made of plastic, textile, paper, etc. It is only essential that the foils have different sliding friction coefficients on their surfaces Meaning of the solution of the invention task.
  • such films are used that are plastic-coated on one side, for example with Teflon.
  • plastics are characterized by low coefficients of friction, i.e. due to good sliding properties.
  • the other side of the film remains uncoated and has the sliding friction coefficient of its base material, which is in any case higher than the sliding friction coefficient of the coated side, in particular because this uncoated surface maintains its normal roughness.
  • a plate cylinder is arranged, the surface of which is designated position 2. It has a defined roughness.
  • a lower film 5 and an upper film 6 are arranged between the plate cylinder 1 and the printing plate 3.
  • the underside 7 of the lower film 5 has a greater roughness than hers Top side 8.
  • the top side 9 of the top film 6 has a greater roughness than the bottom side 10 of the top film 6.
  • the mutually facing and superimposed sides 8, 10 of the films 5, 6 slide well, while the opposite sides 7 , 9 are noticeably rougher.
  • the surfaces 2, 4 also have a noticeable roughness.
  • the layers lie closely one above the other and the pressure plate 1 with the upper film 6 lying against it can easily shift relative to the plate cylinder 1 with the lower film 5 lying against it.
  • the rougher sides 7 and / or 9 are self-adhesive, so that at least one of the foils 5, 6 sticks to the plate cylinder or the printing plate.
  • the well sliding surfaces 8, 10 are preferably achieved by a corresponding plastic coating of the foils 5, 6.
  • Additional foils or sheets can optionally be arranged between the surfaces 2, 7 and / or 4, 9 if this should be necessary. It is therefore also possible to additionally arrange films with the properties according to the invention or also conventional films.

Landscapes

  • Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)
  • Pens And Brushes (AREA)
  • Braking Arrangements (AREA)
  • Mechanical Treatment Of Semiconductor (AREA)

Abstract

Beschrieben wird ein Plattenzylinder, wobei zwischen dem Plattenzylinder und seiner Druckplatte wenigstens zwei Folien angeordnet sind, die jeweils Oberflächen mit unterschiedlichen Gleitreibungskoeffizienten haben. Die glatteren Seiten der Folien liegen aufeinander und die rauheren Seiten liegen an der Oberfläche des Zylinders bzw. an der Unterseite der Druckplatte an.Dadurch wird die Reibung zwischen dem Zylinder und der Druckplatte wesentlich verringert. A plate cylinder is described, wherein at least two foils are arranged between the plate cylinder and its printing plate, each having surfaces with different sliding friction coefficients. The smoother sides of the foils lie on top of each other and the rougher sides lie on the surface of the cylinder or on the underside of the pressure plate, which significantly reduces the friction between the cylinder and the pressure plate.

Description

Die Erfindung betrifft einen Plattenzylinder einer Druckmaschine mit einer auf ihren Umfang aufgespannten Druckplatte und mit einer zwischen dem Plattenzylinder und der Druckplatte vor­gesehenen Folienanordnung.The invention relates to a plate cylinder of a printing press with a printing plate stretched over its circumference and with a film arrangement provided between the plate cylinder and the printing plate.

Zwischen dem Plattenzylinder und der Druckplatte ordnet man herkömmlicherweise einen Unterlagbogen an, der beispielsweise aus Ölpapier besteht. Diese bekannte Anordnung zeichnet sich aber immer noch durch eine sehr hohe Reibungskraft zwischen dem eigentlichen Plattenzylinder und der Druckplatte aus, die insbesondere dadurch bedingt ist, das die rauhe Oberfläche des Plattenzylinders auf der verhältnismäßig rauhen Oberfläche des Ölpapiers aufliegt und auch die rauhe Unterseite der Druckplatte auf der mit der gleichen Rauhigkeit wie die Unterseite ausge­statteten Rauhigkeit der Oberseite des Unterlagbogens. Zur Erläuterung sei erwähnt, daß beim Anziehen einer Druckplatte über die Spannleiste am Druckende am Druckanfang der Druckplatte eine Kraft ankommt, die nur noch etwa gleich ein Fünftel der Kraft am Druckende der Druckplatte beträgt. Die restliche Kraft sind Reibungsverluste. Nach dem Nachspannen über die Spannleiste am Druckanfang liegt an der Spannleiste am Druckanfang eine Kraft an, die etwa gleich dem 0,6-fachen der Kraft am Druckende ist. Auch hier wird der Rest, also etwa 40 % der Kraft, über die Reibung aufgebraucht.Between the plate cylinder and the printing plate, a pad is conventionally arranged, which consists for example of oil paper. However, this known arrangement is still distinguished by a very high frictional force between the actual plate cylinder and the printing plate, which is particularly due to the fact that the rough surface of the plate cylinder rests on the relatively rough surface of the oil paper and also the rough underside of the printing plate the roughness of the upper side of the underlay which is provided with the same roughness as the underside. As an explanation, it should be mentioned that when a pressure plate is tightened via the tensioning strip, a force arrives at the pressure end at the start of the pressure of the pressure plate, which is only approximately one fifth of the force at the pressure end of the pressure plate. The remaining force is friction losses. After re-tensioning via the tension bar at the start of the pressure, a force is applied to the tension bar at the start of the pressure, which is approximately equal to 0.6 times the force at the end of the print. Here, too, the rest, i.e. around 40% of the force, is used up by the friction.

Diese große Reibungskoeffizient zwischen dem Plattenzylinder und der Druckplatte ist aber nachteilig, insbesondere wenn man die Druckplatte auf dem Plattenzylinder nachspannen oder sonstwie im Register ausrichten will. Hier ist auch zu berücksichtigen, das auf die Druckplatte nur begrenzte Kräfte einwirken können, wenn diese nicht unzulässig verformt werden soll.However, this large coefficient of friction between the plate cylinder and the printing plate is disadvantageous, especially if you want to retension the printing plate on the plate cylinder or otherwise align it in the register. It should also be taken into account here that only limited forces can act on the pressure plate if it is not to be deformed inadmissibly.

Die Erfindung vermeidet diese Nachteile. Ihr liegt die Aufgabe zugrunde, einen Plattenzylinder mit den eingangs genannten Merkmalen vorzuschlagen, der sich durch einen fühlbar verringer­ten Reibungskoeffizienten zwischen dem Plattenzylinder und der Druckplatte auszeichnet.The invention avoids these disadvantages. It is based on the object of proposing a plate cylinder with the features mentioned at the outset, which is distinguished by a noticeably reduced coefficient of friction between the plate cylinder and the printing plate.

Zur Lösung dieser Aufgabe ist die Erfindung dadurch gekennzeich­net, das die Folienanordnung wenigstens zwei Folien aufweist, deren eine Fläche jeweils einen kleineren Gleitreibungskoef­fizienten hat als die andere Fläche, wobei die beiden Folien mit ihren Flächen mit den gut gleitenden Eigenschaften aufeinander­gelegt sind.To achieve this object, the invention is characterized in that the foil arrangement has at least two foils, one surface of which has a smaller coefficient of sliding friction than the other surface, the two foils having their surfaces with good sliding properties being superimposed on one another.

Die untere Folie mit ihrem höheren Gleitreibungskoeffizienten liegt somit auf der Oberseite des Plattenzylinders auf und die obere Folie liegt mit ihrer Seite mit dem höheren Gleitreibungs­koeffizienten an der Unterseite der Druckplatte an. Beide Folien liegen mit ihren gut gleitenden Flächen aufeinander und ermöglichen ein Verschieben der Druckplatte relativ zum Plattenzylinder mit geringer Gleitreibung, d.h. gut gleitend. Die eingangs geschilderten Nachteile, insbesondere beim Spannen und Justieren der Druckplatte auf dem Plattenzylinder, werden dadurch somit vermieden.The lower film with its higher coefficient of sliding friction thus lies on the top of the plate cylinder and the upper film lies with its side with the higher coefficient of sliding friction on the underside of the printing plate. Both films lie on top of each other with their well sliding surfaces and allow the printing plate to be moved relative to the plate cylinder with low sliding friction, i.e. smooth sliding. The disadvantages described at the outset, in particular when tensioning and adjusting the printing plate on the plate cylinder, are thus avoided.

Die Folienanordnung kann durch zusätzliche Folien ergänzt werden, beispielsweise durch Unterlagbogen nach dem Stand der Technik zwischen der oberen der beschriebenen Folien und der Unterseite der Druckplatte und/oder zwischen dem Plattenzylinder und der unteren der beschriebenen Folien. Dadurch kann bei­spielsweise der Umfang des Plattenzylinders vergrößert werden. All dies wird von der Erfindung umfaßt.The foil arrangement can be supplemented by additional foils, for example by prior art underlay sheets between the top of the described foils and the underside of the printing plate and / or between the plate cylinder and the bottom of the foils described. As a result, the circumference of the plate cylinder can be increased, for example. All of this is encompassed by the invention.

Es sei auch erwähnt, das, wenn vorstehend und nachfolgend von Folien gesprochen wird, dies flächige, biegsame Gebilde im weitesten Sinne umfaßt, beispielsweise aus Kunststoff, Textil, Papier usw. Wesentlich ist es lediglich, daß die Folien an ihren Flächen unterschiedliche Gleitreibungskoeffizienten haben im Sinne der Lösung der Erfindungsaufgabe.It should also be mentioned that when we speak of foils above and below, this includes flat, flexible structures in the broadest sense, for example made of plastic, textile, paper, etc. It is only essential that the foils have different sliding friction coefficients on their surfaces Meaning of the solution of the invention task.

Beispielsweise nimmt man derartige Folien, die einseitig kunststoffbeschichtet sind, beispielsweise mit Teflon. Derartige Kunststoffe zeichnen sich durch niedrige Reibungskoeffizienten aus, d.h. durch gut gleitende Eigenschaften. Die andere Seite der Folie bleibt unbeschichtet und hat den Gleitreibungskoef­fizienten ihres Grundmaterials, der in jedem Fall höher ist als der Gleitreibungskoeffizient der beschichteten Seite, ins­besondere weil diese unbeschichtete Fläche ihre normale Rauhigkeit beibehält.For example, such films are used that are plastic-coated on one side, for example with Teflon. Such plastics are characterized by low coefficients of friction, i.e. due to good sliding properties. The other side of the film remains uncoated and has the sliding friction coefficient of its base material, which is in any case higher than the sliding friction coefficient of the coated side, in particular because this uncoated surface maintains its normal roughness.

Die Erfindung wird im folgenden anhand eines Ausführungsbeispie­les näher erläutert, aus dem sich weitere wichtige Merkmale ergeben. Die Figur zeigt schematisch und der Einfachheit halber in einer Abwicklung einen Ausschnitt aus einem Plattenzylinder nach der Erfindung, wobei die verschiedenen Bauelemente zum besseren Verständnis beabstandet voneinander gezeigt sind.The invention is explained in more detail below on the basis of an exemplary embodiment from which further important features result. The figure shows schematically and for the sake of simplicity a section of a plate cylinder according to the invention, the various components being shown spaced apart for better understanding.

Bei Pos. 1 ist ein Plattenzylinder angeordnet, dessen Oberfäche mit Pos. 2 bezeichnet ist. Sie hat eine definierte Rauhigkeit.At position 1, a plate cylinder is arranged, the surface of which is designated position 2. It has a defined roughness.

Auf den eigentlichen Plattenzylinder ist eine Druckplatte 3 aufgespannt, deren Unterseite eine definierte Rauhigkeit 4 hat.A pressure plate 3, the underside of which has a defined roughness 4, is clamped onto the actual plate cylinder.

Zwischen dem Plattenzylinder 1 und der Druckplatte 3 sind eine untere Folie 5 und eine obere Folie 6 angeordnet. Die Unterseite 7 der unteren Folie 5 hat eine größere Rauhigkeit als ihre Oberseite 8. Entsprechend hat die Oberseite 9 der oberen Folie 6 eine größere Rauhigkeit als die Unterseite 10 der oberen Folie 6. Mit anderen Worten sind die einander zugekehrten und aufeinanderliegenden Seiten 8, 10 der Folien 5, 6 gut gleitend, während die abgekehrten Seiten 7, 9 fühlbar rauher sind. Auch die Flächen 2, 4 haben eine fühlbare Rauhigkeit.A lower film 5 and an upper film 6 are arranged between the plate cylinder 1 and the printing plate 3. The underside 7 of the lower film 5 has a greater roughness than hers Top side 8. Correspondingly, the top side 9 of the top film 6 has a greater roughness than the bottom side 10 of the top film 6. In other words, the mutually facing and superimposed sides 8, 10 of the films 5, 6 slide well, while the opposite sides 7 , 9 are noticeably rougher. The surfaces 2, 4 also have a noticeable roughness.

Im Betrieb liegen die Schichten dicht übereinander und die Druckplatte 1 mit der an ihr anliegenden oberen Folie 6 kann sich leicht relativ zum Plattenzylinder 1 mit der an ihr anliegenden unteren Folie 5 verschieben.In operation, the layers lie closely one above the other and the pressure plate 1 with the upper film 6 lying against it can easily shift relative to the plate cylinder 1 with the lower film 5 lying against it.

Beispielsweise sind die rauheren Seiten 7 und/oder 9 selbstkle­bend, so daß zumindest eine der Folien 5, 6 auf dem Platten­zylinder bzw. der Druckplatte klebt.For example, the rougher sides 7 and / or 9 are self-adhesive, so that at least one of the foils 5, 6 sticks to the plate cylinder or the printing plate.

Die gut gleitenden Flächen 8, 10 werden vorzugsweise durch eine entsprechende Kunststoffbeschichtung der Folien 5, 6 erreicht.The well sliding surfaces 8, 10 are preferably achieved by a corresponding plastic coating of the foils 5, 6.

Weitere Folien oder Bogen können ggf. zwischen den Flächen 2, 7 und/oder 4, 9 angeordnet sein, wenn die erforderlich sein sollte. Man kann daher auch Folien mit den erf indungsgemäßen Eigenschaften oder auch herkömmliche Folien zusätzlich anordnen.Additional foils or sheets can optionally be arranged between the surfaces 2, 7 and / or 4, 9 if this should be necessary. It is therefore also possible to additionally arrange films with the properties according to the invention or also conventional films.

Claims (2)

1. Plattenzylinder (1) einer Druckmaschine mit einer auf ihren Umfang aufgespannten Druckplatte (3) und mit einer zwischen dem Plattenzylinder und der Druckplatte vor­gesehenen Folienanordnung,
dadurch gekennzeichnet,
daß die Folienanordnung wenigstens zwei Folien (5,6) aufweist, deren eine Fläche (8,10) jeweils einen kleine­ren Gleitreibungskoeffizienten hat als die andere Fläche (7,9), wobei die beiden Folien (5,6) mit ihren Flächen (8,10) mit den gut gleitenden Eigenschaften aufeinander gelegt sind.1. plate cylinder (1) of a printing press with a printing plate (3) stretched over its circumference and with a film arrangement provided between the plate cylinder and the printing plate,
characterized by
that the film arrangement has at least two films (5, 6), one surface (8, 10) of which has a smaller coefficient of sliding friction than the other surface (7, 9), the two films (5, 6) with their surfaces (8 , 10) are placed on top of each other with the good sliding properties. 2. Plattenzylinder nach Anspruch 1,
dadurch gekennzeichnet,
daß die Folien (5,6) einseitig kunststoffbeschichtet sind.2. plate cylinder according to claim 1,
characterized by
that the foils (5,6) are plastic coated on one side.
EP90120305A 1989-11-02 1990-10-23 Plate cylinder Expired - Lifetime EP0425982B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3936448A DE3936448C1 (en) 1989-11-02 1989-11-02
DE3936448 1989-11-02

Publications (3)

Publication Number Publication Date
EP0425982A2 true EP0425982A2 (en) 1991-05-08
EP0425982A3 EP0425982A3 (en) 1992-03-18
EP0425982B1 EP0425982B1 (en) 1994-08-31

Family

ID=6392706

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90120305A Expired - Lifetime EP0425982B1 (en) 1989-11-02 1990-10-23 Plate cylinder

Country Status (6)

Country Link
US (1) US5154120A (en)
EP (1) EP0425982B1 (en)
JP (1) JPH0790636B2 (en)
AT (1) ATE110642T1 (en)
DE (2) DE3936448C1 (en)
ES (1) ES2059952T3 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0622248A1 (en) * 1993-04-30 1994-11-02 MAN Roland Druckmaschinen AG Plate cylinder for a printing machine
EP1136282A3 (en) * 2000-03-03 2001-11-28 Fuji Photo Film Co., Ltd. Interleaf sheet for planographic printing plates, abutting member for planographic printing plates, and packaging structure for planographic printing plates

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4315311C2 (en) * 1993-04-30 1996-11-28 Roland Man Druckmasch Plate cylinder for a printing machine
DE19526703C2 (en) * 1995-07-24 1999-08-19 Saechsisches Inst Fuer Die Dru Process for the production of underlays for printing plates on plate cylinders
JPH10754A (en) * 1996-06-17 1998-01-06 Shinohara Tekkosho:Kk Plate cylinder of sheet-feed press
JP2005035003A (en) * 2003-07-15 2005-02-10 Konica Minolta Medical & Graphic Inc Block copy sheet material, method for imposing printing plate, and method for printing

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2821026A (en) * 1955-06-24 1958-01-28 Moggridge George Arthur Printing plate location and affixing means
US3705072A (en) * 1970-05-04 1972-12-05 Minnesota Mining & Mfg Underpacking for printing with dimensionally stable plastic core having elastomeric and pressure sensitive outer layers
US4178402A (en) * 1972-04-13 1979-12-11 Klapproth Friedrich Cylinder blanket for offset printing presses
AU7225187A (en) * 1986-05-01 1987-11-05 Minnesota Mining And Manufacturing Company Method and underpacking for mounting printing plates on a rotary printing press

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0622248A1 (en) * 1993-04-30 1994-11-02 MAN Roland Druckmaschinen AG Plate cylinder for a printing machine
EP1136282A3 (en) * 2000-03-03 2001-11-28 Fuji Photo Film Co., Ltd. Interleaf sheet for planographic printing plates, abutting member for planographic printing plates, and packaging structure for planographic printing plates
US6551696B2 (en) 2000-03-03 2003-04-22 Fuji Photo Film Co., Ltd. Interleaf sheet for planographic printing plates, abutting member for planographic printing plates, and packaging structure for planographic printing plates

Also Published As

Publication number Publication date
EP0425982A3 (en) 1992-03-18
JPH0790636B2 (en) 1995-10-04
US5154120A (en) 1992-10-13
ES2059952T3 (en) 1994-11-16
JPH0485039A (en) 1992-03-18
EP0425982B1 (en) 1994-08-31
DE59006969D1 (en) 1994-10-06
DE3936448C1 (en) 1991-04-18
ATE110642T1 (en) 1994-09-15

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