EP2040931B1 - Stochastically lasered film roller - Google Patents

Stochastically lasered film roller Download PDF

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Publication number
EP2040931B1
EP2040931B1 EP07787681.1A EP07787681A EP2040931B1 EP 2040931 B1 EP2040931 B1 EP 2040931B1 EP 07787681 A EP07787681 A EP 07787681A EP 2040931 B1 EP2040931 B1 EP 2040931B1
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Prior art keywords
ink
roller
film roller
film
projections
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EP07787681.1A
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German (de)
French (fr)
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EP2040931A1 (en
Inventor
Graham Macfarlane
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Felix Bottcher & Co KG GmbH
Felix Boettcher GmbH and Co KG
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Felix Bottcher & Co KG GmbH
Felix Boettcher GmbH and Co KG
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Application filed by Felix Bottcher & Co KG GmbH, Felix Boettcher GmbH and Co KG filed Critical Felix Bottcher & Co KG GmbH
Priority to PL07787681T priority Critical patent/PL2040931T3/en
Priority to EP07787681.1A priority patent/EP2040931B1/en
Priority to SI200731988T priority patent/SI2040931T1/en
Publication of EP2040931A1 publication Critical patent/EP2040931A1/en
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Publication of EP2040931B1 publication Critical patent/EP2040931B1/en
Priority to CY20171101248T priority patent/CY1119627T1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F31/00—Inking arrangements or devices
    • B41F31/26—Construction of inking rollers
    • 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
    • B41N7/00—Shells for rollers of printing machines
    • B41N7/06—Shells for rollers of printing machines for inking rollers

Definitions

  • the invention relates to film rolls, to processes for producing the film roll and to their use.
  • Offset presses use rollers to transfer ink from the ink fountain.
  • the first roller, the ink fountain roller or the ink fountain roller picks up ink from the ink fountain and transfers it to a film roller, the distance between the ink fountain roller and the film roller ensuring that only a certain proportion of the ink provided is transferred further.
  • the EP 0 594 016 B1 describes purging rollers with stochastic pattern in gravure printing.
  • the object of the present invention was to provide an apparatus and a method with which the stated disadvantages of the prior art are overcome.
  • the object is achieved by a film roller for offset printing with a surface with elevations and depressions, wherein the elevations and depressions together form an irregular, random pattern.
  • the film roll has irregular, random patterns which form elevations and depressions on the surface.
  • Such patterns are also referred to as stochastic patterns. They arise, for example, in which are removed by a given material on a roll surface by a processing step smaller areas and the machining direction of the tool changes at random; ie e.g. computer-controlled the decision on the change of direction is made at random.
  • depressions as well as the protrusion of material form elevations that extend beyond the original surface.
  • the depressions form passages on the surface. It creates labyrinth-like structures.
  • the elevations form - as in the figures - coherent areas.
  • the film roll according to the invention has no regular patterns.
  • the structure is not only defined by eg a diameter or a depth, but in addition the structure motif randomly changes its directional course on the surface.
  • US 4,763,041 describes a film roll in which cylindrically shaped holes are introduced by means of a pulsed laser. In contrast to the present invention, although this results in irregular holes but not in an irregular random pattern on the surface of the roller. In addition, only holes are formed so that - in contrast to the invention - no surveys arise.
  • FR 2,449,484 describes a roller which has cracks or crevices in subregions of the surface, the surface being made of metal and up to 30% of the surface being covered by cracks. This describes FR 2,449,484 no elevations and depressions, since the polished area has no elevations relative to the roll surface.
  • EP 0 662 394 describes overlays of several regular patterns. Although it is described that the tool used to apply the patterns may have an irregular shape. However, even with this tool, the regular pattern remains on the surface.
  • the film roll according to the invention preferably has a roughness R z measured according to DIN EN ISO 4287 in the range of 200 to 1,000 .mu.m, preferably 400 to 700 .mu.m.
  • the surface of the film roll may consist of different materials, in particular polymers such as polyamide, polyurethane or copper, ceramic or matt chrome are suitable. Rollers of at least 50% polyamide are particularly preferred.
  • the filling volume is also suitable for describing the surface structure.
  • a topography image is examined, with the middle level of the topography image being assigned the height value 0.
  • a filling volume can be calculated, which is a measure of the surface structure.
  • This filling volume is then represented as volume (free volume) per area and is referred to below as V 1 .
  • Preferred free volumes V 1 are between 0.005 and 0.5, more preferably between 0.01 and 0.15 mm 3 / mm 2 .
  • V 2 It is also possible to calculate a filling volume up to the complete filling of the surface, ie between lowest and highest profile value. This is referred to below as V 2 .
  • Preferred volumes are between 0.02 to 1.5 mm 3 / mm 2 , more preferably between 0.06 to 1.0 mm 3 / mm 2 .
  • FIGS. 5 and 6 show by means of a sketch the differences between the filling volume V 1 and V 2 .
  • the calculated volume is represented by the gray areas.
  • the arithmetic mean of the width of the gears is 0.1 and up to 1 mm.
  • the arithmetic mean of the depth of the gears is in the range between 0.1 and 0.5 mm.
  • the width of the webs in the range of 0.3 to 8 mm, preferably 0.5 to 3 mm. It is preferred that the width and depth are matched so that the arithmetic mean of the width and the depth are in the ratio between 3: 1 and 1: 2.
  • the protrusions and depressions form an irregular random pattern having a lower free volume in the peripheral areas of the film roll. This is particularly useful when in the printing press so-called “narrow webs" are driven, i. Webs that do not occupy the entire width of the roller. This causes problems that in the edge areas in which the colors are not removed, the transferred color is thrown off, dries, etc.
  • a lower free volume is preferably present in the edge regions of the film rolls, for example by 20% less than in the middle region, preferably by 10% less than in the middle of the roll.
  • this lower free volume can be compensated by opening the ink keys and otherwise by an increased color guide in these edge regions.
  • the invention furthermore relates to an inking unit which comprises the film roller according to the invention.
  • Ink units usually include a variety of rollers, with which the amount and quality of the paint job is controlled.
  • the inking unit according to the invention therefore comprises, in addition to a Farbduktor, the film roll according to the invention and an applicator roll optionally further rolls, as they are known in the art.
  • the invention further provides a process for producing the film roll according to the invention comprising the step of treating the surfaces with a laser to produce an irregular, random pattern of elevations and depressions.
  • the film roller according to the invention and the inventive method that the color transport is carried out with a better efficiency. This means that less ink remains on the film roll, which ultimately results in less spatter because less ink needs to be transported.
  • the film rolls according to the invention can be cleaned well.
  • the stochastic pattern moreover leads to a lesser abrasion occurring with the film rollers according to the invention.
  • a roll with a polyamide surface coating diameter of about 55 mm was irradiated with the aid of a CO 2 industrial laser (VWA 1200 from Baasel, Starnberg) with 400 W.
  • VWA 1200 from Baasel, Starnberg
  • the roller was rotated and the laser stochastically passed over the surface. From the surfaces thus obtained, the topography was measured.
  • the FIGS. 1a and 1b show a corresponding representation. Subsequently, the roughness values were measured.
  • the Rz measured according to DIN EN ISO 4287 was 415 ⁇ m.
  • a corresponding profile was measured on a cutting line in a topographical image.
  • the filling volumes were calculated as the volume from the wells to the zero line (center between deepest well and highest bump). Based on an area of 50.69 mm 2 , the free volume was 2.192 mm 3 . This corresponds to a free volume V 1 of 0.043 mm 3 / mm 2 , V 2 of 0.182 mm 3 / mm 2 .
  • Example 2 a roll was treated as in Example 1 with 400 W again.
  • the profile around the profile was extended by computer modulations by 75%, so that the valleys and surveys are wider.
  • FIGS. 2a and 2b show a corresponding representation of the profile thus obtained. Again, the roll was measured. The roughness was Rz according to DIN EN ISO 4287 496 ⁇ m. Subsequently, a topography uptake was again carried out and measured as described in Example 1. The result was a volume of 2.617 mm 3 on an area of 50.69 mm 2 . This again corresponds to a free volume V 1 of 0.052, a free volume V 2 of 0.264 mm 3 / mm 2 .
  • a roll as in Example 1 was treated with a power of 600 W, so that the depressions are made deeper.
  • FIGS. 3a and 3b show a corresponding Topographiement.
  • the roughness values were also measured thereon.
  • the result was a Rz according to DIN EN ISO 4287 of 613 microns.
  • a Topographiement was measured in terms of filling volume. This is in the FIGS. 4a and 4b shown.
  • the result was a volume of 3.511 mm 3 on an area of 50.69 mm 2 . This corresponds to a free volume of 0.069 mm 3 / mm 2 , the free volume V 2 0.292 mm 3 / mm 2 .

Description

Die Erfindung betrifft Filmwalzen, Verfahren zur Herstellung der Filmwalze und ihre Verwendung.The invention relates to film rolls, to processes for producing the film roll and to their use.

In Offset-Druckmaschinen werden zur Übertragung der Farbe aus dem Farbkasten Walzen eingesetzt. Hierbei nimmt typischerweise die erste Walze, die Farbtauchwalze oder der Farbduktor, Farbe aus dem Farbkasten auf und überträgt diese auf eine Filmwalze, wobei der Abstand zwischen Farbduktor und der Filmwalze dafür sorgt, dass nur ein bestimmter Anteil der bereitgestellten Farbe weiter übertragen wird.Offset presses use rollers to transfer ink from the ink fountain. Here, typically, the first roller, the ink fountain roller or the ink fountain roller picks up ink from the ink fountain and transfers it to a film roller, the distance between the ink fountain roller and the film roller ensuring that only a certain proportion of the ink provided is transferred further.

Zwischen dem Farbduktor und der Filmwalze sowie zwischen der Filmwalze und der nachfolgenden Übertragungswalze muss sich die Druckfarbe spalten. Häufig wird an den Spaltstellen Farbe verspritzt. Aufgrund der nicht vollständigen Entfernung der Farbe von der Filmwalze kommt es zu einer Überladung der Walze mit Farbe, die unkontrolliert abgeschleudert wird. Zur Gewährleistung des Farbübertrags und Reduzierung des Ausschleuderns wurden im Stand der Technik bereits strukturierte Oberflächen eingesetzt z.B. Filmwalzen mit Rautenprofilen und spiralförmigen Rillenprofilen; siehe DE 101 03 842 .Between the ink fountain roller and the film roller and between the film roller and the subsequent transfer roller, the ink must split. Often, paint is sprayed at the cleavage sites. Due to the incomplete removal of the ink from the film roller, the roller will become over-charged with ink, which will be thrown off in an uncontrolled manner. To ensure the ink transfer and reduce the ejection already structured surfaces have been used in the art, for example, film rolls with diamond profiles and spiral groove profiles; please refer DE 101 03 842 ,

Die strukturierten Oberflächen entsprechender Filmwalzen dienen im wesentlichen zur Steuerung der Farbmengen, die zwischen den Walzen übertragen werden. Es wurden verschiedene Steigungen solcher Profile getestet, die einen gewissen Einfluss auf das Problem des Farbnebelns bzw. -spritzens haben, ohne dass konkrete Fortschritte erreicht wurden. Darüber hinaus traten mit der stärkeren Ausprägung der Profile Probleme mit ungleichmäßigem Farbübertrag bzw. einer gewissen Streifenbildung auf, die auf die Oberflächenstrukturen zurückgeführt wurden.The textured surfaces of respective film rolls serve essentially to control the amounts of ink transferred between the rolls. Various gradients of such profiles have been tested which have some impact on the problem of paint misting without any tangible progress being made. In addition, problems with uneven color transfer or a certain streaking, which were attributed to the surface structures, occurred with the increased severity of the profiles.

Ferner wurden ein verstärkter Abrieb der an der Filmwalze angestellten Elastomerwalze sowie erhebliche Schwierigkeiten festgestellt, strukturierte Walzen zu reinigen.Further, increased abrasion of the elastomeric roller employed on the film roll and significant difficulties have been found in cleaning structured rolls.

Die EP 0 594 016 B1 beschreibt Anspülwalzen mit stochastischem Muster im Tiefdruck.The EP 0 594 016 B1 describes purging rollers with stochastic pattern in gravure printing.

Aufgabe der vorliegenden Erfindung war es, eine Vorrichtung und ein Verfahren zur Verfügung zu stellen, mit dem die genannten Nachteile des Standes der Technik überwunden werden.The object of the present invention was to provide an apparatus and a method with which the stated disadvantages of the prior art are overcome.

Gelöst wird die Aufgabe durch eine Filmwalze für den Offset-Druck mit einer Oberfläche mit Erhebungen und Vertiefungen, wobei die Erhebungen und Vertiefungen gemeinsam ein unregelmäßiges, zufälliges Muster bilden.The object is achieved by a film roller for offset printing with a surface with elevations and depressions, wherein the elevations and depressions together form an irregular, random pattern.

Erfindungsgemäß weist die Filmwalze unregelmäßige, zufällige Muster auf, die Erhebungen und Vertiefungen auf der Oberfläche bilden. Solche Muster werden auch als stochastische Muster bezeichnet. Sie entstehen beispielsweise, in dem von einem vorgegebenen Material auf einer Walzenoberfläche durch einen Bearbeitungsschritt kleinere Bereiche entfernt werden und die Bearbeitungsrichtung des Werkzeuges sich zufällig ändert; also z.B. computergesteuert die Entscheidung über die Richtungsänderung zufällig getroffen wird. Gegenüber dem ursprünglichen Niveau der Oberfläche bilden sich erfindungsgemäß sowohl Vertiefungen als auch durch das Herausdrängen von Material Erhebungen, die über die ursprüngliche Oberfläche hinausgehen. Wie aus den Figuren ersichtlich bilden die Vertiefungen Gänge auf der Oberfläche. Es entstehen labyrinth-artige Strukturen. Auch die Erhebungen bilden - wie in den Figuren - zusammenhängende Bereiche.According to the invention, the film roll has irregular, random patterns which form elevations and depressions on the surface. Such patterns are also referred to as stochastic patterns. They arise, for example, in which are removed by a given material on a roll surface by a processing step smaller areas and the machining direction of the tool changes at random; ie e.g. computer-controlled the decision on the change of direction is made at random. Compared to the original level of the surface, according to the invention, depressions as well as the protrusion of material form elevations that extend beyond the original surface. As can be seen from the figures, the depressions form passages on the surface. It creates labyrinth-like structures. The elevations form - as in the figures - coherent areas.

Insbesondere weist die erfindungsgemäße Filmwalze keine regelmäßigen Muster auf. Die Struktur wird nicht nur durch z.B. einen Durchmesser oder eine Tiefe definiert, sondern zusätzlich ändert das Strukturmotiv zufällig seinen Richtungsverlauf auf der Oberfläche.In particular, the film roll according to the invention has no regular patterns. The structure is not only defined by eg a diameter or a depth, but in addition the structure motif randomly changes its directional course on the surface.

US 4,763,041 beschreibt eine Filmwalze, in die mittels eines gepulsten Lasers zylindrisch geformte Löcher eingebracht werden. Im Gegensatz zu der vorliegenden Erfindung führt dies zwar zu unregelmäßigen Löchern aber nicht zu einem unregelmäßigen zufälligen Muster auf der Oberfläche der Walze. Darüber hinaus werden nur Löcher gebildet, so dass - im Gegensatz zur Erfindung - keine Erhebungen entstehen. US 4,763,041 describes a film roll in which cylindrically shaped holes are introduced by means of a pulsed laser. In contrast to the present invention, although this results in irregular holes but not in an irregular random pattern on the surface of the roller. In addition, only holes are formed so that - in contrast to the invention - no surveys arise.

FR 2,449,484 beschreibt eine Walze, die in Teilbereichen der Oberfläche Risse oder Spalten aufweist, wobei die Oberfläche aus Metall besteht und bis zu 30% der Oberfläche mit Rissen bedeckt sein können. Damit beschreibt FR 2,449,484 keine Erhebungen und Vertiefungen, da der polierte Bereich gegenüber der Walzenoberfläche keine Erhebungen aufweist. FR 2,449,484 describes a roller which has cracks or crevices in subregions of the surface, the surface being made of metal and up to 30% of the surface being covered by cracks. This describes FR 2,449,484 no elevations and depressions, since the polished area has no elevations relative to the roll surface.

EP 0 662 394 beschreibt Überlagerungen mehrerer regelmäßiger Muster. Es wird zwar beschrieben, dass das Werkzeug, mit dem in die Muster appliziert werden, eine unregelmäßige Form haben kann. Es bleibt jedoch auch bei Verwendung dieses Werkzeugs beim regelmäßigen Muster auf der Oberfläche. EP 0 662 394 describes overlays of several regular patterns. Although it is described that the tool used to apply the patterns may have an irregular shape. However, even with this tool, the regular pattern remains on the surface.

Die erfindungsgemäße Filmwalze weist bevorzugt eine Rauhtiefe Rz gemessen nach DIN EN ISO 4287 im Bereich von 200 bis 1.000 µm auf, bevorzugt 400 bis 700 µm. Die Oberfläche der Filmwalze kann aus verschiedenen Materialien bestehen, insbesondere sind Polymere wie Polyamid, Polyurethan oder Kupfer, Keramik oder Mattchrom geeignet. Walzen aus mindestens 50% Polyamid sind besonders bevorzugt.The film roll according to the invention preferably has a roughness R z measured according to DIN EN ISO 4287 in the range of 200 to 1,000 .mu.m, preferably 400 to 700 .mu.m. The surface of the film roll may consist of different materials, in particular polymers such as polyamide, polyurethane or copper, ceramic or matt chrome are suitable. Rollers of at least 50% polyamide are particularly preferred.

Zur Beschreibung der Oberflächenstruktur eignet sich insbesondere auch das Füllvolumen. Hierbei wird eine Topographieaufnahme untersucht, wobei der mittleren Ebene der Topographieaufnahme der Höhenwert 0 zugeordnet wird. So kann ein Füllvolumen berechnet werden, das als Maß für die Oberflächenstruktur gilt. Dieses Füllvolumen wird dann als Volumen (freies Volumen) pro Fläche dargestellt und im Folgenden als V1 bezeichnet. Bevorzugte freie Volumina V1 liegen zwischen 0,005 und 0,5, mehr bevorzugt zwischen 0,01 und 0,15 mm3/mm2.In particular, the filling volume is also suitable for describing the surface structure. In this case, a topography image is examined, with the middle level of the topography image being assigned the height value 0. Thus, a filling volume can be calculated, which is a measure of the surface structure. This filling volume is then represented as volume (free volume) per area and is referred to below as V 1 . Preferred free volumes V 1 are between 0.005 and 0.5, more preferably between 0.01 and 0.15 mm 3 / mm 2 .

Es ist auch möglich, ein Füllvolumen bis zur kompletten Füllung der Oberfläche zu berechnen, also zwischen tiefstem und höchstem Profilwert. Dies wird im Folgenden als V2 bezeichnet. Bevorzugte Volumina liegen zwischen 0,02 bis 1,5 mm3/mm2, mehr bevorzugt zwischen 0,06 bis 1,0 mm3/mm2.It is also possible to calculate a filling volume up to the complete filling of the surface, ie between lowest and highest profile value. This is referred to below as V 2 . Preferred volumes are between 0.02 to 1.5 mm 3 / mm 2 , more preferably between 0.06 to 1.0 mm 3 / mm 2 .

Figur 5 und 6 zeigen anhand einer Skizze die Unterschiede zwischen dem Füllvolumen V1 und V2. Das errechnete Volumen wird jeweils durch die grauen Flächen repräsentiert. FIGS. 5 and 6 show by means of a sketch the differences between the filling volume V 1 and V 2 . The calculated volume is represented by the gray areas.

Typischerweise liegt das arithmetische Mittel der Breite der Gänge bei 0,1 und bis 1 mm. Das arithmetische Mittel der Tiefe der Gänge liegt im Bereich zwischen 0,1 und 0,5 mm. Typischerweise liegt die Breite der Stege im Bereich 0,3 bis 8 mm, bevorzugt 0,5 bis 3 mm. Es wird bevorzugt, dass Breite und Tiefe aufeinander abgestimmt sind, so dass das arithmetische Mittel der Breite und der Tiefe im Verhältnis zwischen 3:1 und 1:2 liegen.Typically, the arithmetic mean of the width of the gears is 0.1 and up to 1 mm. The arithmetic mean of the depth of the gears is in the range between 0.1 and 0.5 mm. Typically, the width of the webs in the range of 0.3 to 8 mm, preferably 0.5 to 3 mm. It is preferred that the width and depth are matched so that the arithmetic mean of the width and the depth are in the ratio between 3: 1 and 1: 2.

In einer bevorzugten Ausführungsform bilden die Erhebungen und Vertiefungen ein unregelmäßiges zufälliges Muster, das in den Randbereichen der Filmwalze ein geringeres freies Volumen aufweist. Dies ist insbesondere dann sinnvoll, wenn in der Druckmaschine sogenannte "schmale Bahnen" gefahren werden, d.h. Bahnen, die nicht die gesamte Breite der Walze einnehmen. Hierbei treten dadurch Probleme auf, dass in den Randbereichen, in denen die Farben nicht abgenommen wird, die übertragene Farbe weggeschleudert wird, eintrocknet, etc.In a preferred embodiment, the protrusions and depressions form an irregular random pattern having a lower free volume in the peripheral areas of the film roll. This is particularly useful when in the printing press so-called "narrow webs" are driven, i. Webs that do not occupy the entire width of the roller. This causes problems that in the edge areas in which the colors are not removed, the transferred color is thrown off, dries, etc.

Bevorzugt liegt daher in den Randbereichen der Filmwalzen ein geringeres freies Volumen vor, beispielsweise um 20% geringer als im Mittelbereich, bevorzugt um 10% geringer als in der Mitte der Walze. Hierdurch wird in den Randbereichen beim Betrieb als Schmalbahn weniger Farbe übertragen. Wird auf einer solchen Walze für eine Vollbahn eingesetzt, kann dieses geringere freie Volumen ausgeglichen werden durch Öffnung der Farbzonenschrauben und auch sonst durch eine erhöhte Farbführung in diesen Randbereichen.Therefore, a lower free volume is preferably present in the edge regions of the film rolls, for example by 20% less than in the middle region, preferably by 10% less than in the middle of the roll. As a result, less color is transmitted in the edge areas when operating as a narrow web. If used on such a roller for a full web, this lower free volume can be compensated by opening the ink keys and otherwise by an increased color guide in these edge regions.

Gegenstand der Erfindung ist weiterhin ein Farbwerk, das die erfindungsgemäße Filmwalze umfasst. Farbwerke umfassen meist eine Vielzahl von Walzen, mit denen die Menge und die Qualität des Farbauftrages gesteuert wird.The invention furthermore relates to an inking unit which comprises the film roller according to the invention. Ink units usually include a variety of rollers, with which the amount and quality of the paint job is controlled.

Das erfindungsgemäße Farbwerk umfasst daher neben einem Farbduktor, der erfindungsgemäßen Filmwalze und einer Auftragswalze gegebenenfalls weitere Walzen, wie sie im Stand der Technik bekannt sind.The inking unit according to the invention therefore comprises, in addition to a Farbduktor, the film roll according to the invention and an applicator roll optionally further rolls, as they are known in the art.

Gegenstand der Erfindung ist weiterhin ein Verfahren zur Herstellung der erfindungsgemäßen Filmwalze umfassend den Schritt der Behandlung der Oberflächen mit einem Laser, um ein unregelmäßiges, zufälliges Muster aus Erhebungen und Vertiefungen zu erzeugen.The invention further provides a process for producing the film roll according to the invention comprising the step of treating the surfaces with a laser to produce an irregular, random pattern of elevations and depressions.

Gegenstand der Erfindung ist weiterhin ein Verfahren zum Transport einer Druckfarbe im Offsetdruck mit folgenden Schritten:

  • Transport einer Druckfarbe aus einem Farbkasten auf einen Farbduktor;
  • Transport der Druckfarbe von dem Farbduktor auf eine Filmwalze mit einer Oberfläche, die Erhebungen und Vertiefungen aufweist, die ein unregelmäßiges, zufälliges Muster bilden.
The invention further provides a process for transporting an ink in offset printing, comprising the following steps:
  • Transporting a printing ink from an ink fountain onto a ink ductor;
  • Transporting the ink from the ink fountain roller to a film roll having a surface having ridges and pits forming an irregular, random pattern.

Überraschenderweise wird durch die erfindungsgemäße Filmwalze und das erfindungsgemäße Verfahren erreicht, dass der Farbtransport mit einer besseren Effizienz durchgeführt wird. Dies bedeutet, dass weniger Farbe auf der Filmwalze verbleibt, was im Endeffekt zu einem geringeren Verspritzen führt, da weniger Farbe transportiert werden muss.Surprisingly, it is achieved by the film roller according to the invention and the inventive method that the color transport is carried out with a better efficiency. This means that less ink remains on the film roll, which ultimately results in less spatter because less ink needs to be transported.

Darüber hinaus lassen sich überraschenderweise die erfindungsgemäßen Filmwalzen gut reinigen.In addition, surprisingly, the film rolls according to the invention can be cleaned well.

Das stochastische Muster führt darüber hinaus dazu, dass mit den erfindungsgemäßen Filmwalzen ein geringerer Abrieb auftritt.The stochastic pattern moreover leads to a lesser abrasion occurring with the film rollers according to the invention.

In einer besonders bevorzugten Ausführungsform ist es so, dass bei der Bildung der unregelmäßigen zufälligen Muster darauf geachtet wird, dass keine Bereiche mit einer Länge von ≥ 3 mm von Erhebungen bestehen bleiben, die in einem Bereich von 0 bis 45° zur Rotationsachse der Walze bestehen bleiben. Auf dieser Weise wird verhindert, dass Stege entstehen, die über einen größeren Bereich quer zur Laufrichtung der Walze stehen.In a particularly preferred embodiment, care is taken in the formation of the irregular random pattern that no areas with a length of ≥ 3 mm remain of elevations that exist in a range of 0 to 45 ° to the axis of rotation of the roller stay. In this way it is prevented that webs arise which are transverse to the running direction of the roller over a larger area.

Die Erfindung wird durch die nachstehenden Beispiele näher erläutertThe invention is further illustrated by the following examples

Beispiel 1example 1

Eine Walze mit einer Polyamid-Oberflächenbeschichtung Durchmesser ca. 55 mm wurde mit Hilfe eines CO2-Industrielasers (VWA 1200 der Firma Baasel, Starnberg) mit 400 W bestrahlt. Hierzu wurde die Walze rotiert und der Laser stochastisch über die Oberfläche geführt. Von den so erhaltenen Oberflächen wurde die Topographie vermessen. Die Figuren 1a und 1b zeigen eine entsprechende Darstellung. Anschließend wurden die Rauheitswerte vermessen. Der Rz gemessen nach DIN EN ISO 4287 betrug 415 µm.A roll with a polyamide surface coating diameter of about 55 mm was irradiated with the aid of a CO 2 industrial laser (VWA 1200 from Baasel, Starnberg) with 400 W. For this purpose, the roller was rotated and the laser stochastically passed over the surface. From the surfaces thus obtained, the topography was measured. The FIGS. 1a and 1b show a corresponding representation. Subsequently, the roughness values were measured. The Rz measured according to DIN EN ISO 4287 was 415 μm.

Anschließend wurde in einer Topographieaufnahme an einer Schnittlinie ein entsprechendes Profil vermessen. Die Füllvolumina wurden berechnet als Volumen von den Vertiefungen bis zur Nulllinie (Mitte zwischen tiefster Vertiefung und höchster Erhebung). Bezogen auf eine Fläche von 50,69 mm2 betrug das freie Volumen 2,192 mm3. Dies entspricht einem freien Volumen V1 von 0,043 mm3/mm2, V2 von 0,182 mm3/mm2.Subsequently, a corresponding profile was measured on a cutting line in a topographical image. The filling volumes were calculated as the volume from the wells to the zero line (center between deepest well and highest bump). Based on an area of 50.69 mm 2 , the free volume was 2.192 mm 3 . This corresponds to a free volume V 1 of 0.043 mm 3 / mm 2 , V 2 of 0.182 mm 3 / mm 2 .

Beispiel 2Example 2

Anschließend wurde eine Walze wie im Beispiel 1 mit wiederum 400 W behandelt. Allerdings wurde das Profil um das Profil durch Computermodulationen um 75% gestreckt, so dass die Täler und Erhebungen breiter ausfallen.Subsequently, a roll was treated as in Example 1 with 400 W again. However, the profile around the profile was extended by computer modulations by 75%, so that the valleys and surveys are wider.

Die Figuren 2a und 2b zeigen eine entsprechende Darstellung des so erhaltenen Profils. Wiederum wurde die Walze vermessen. Die Rauheit betrug Rz nach DIN EN ISO 4287 496 µm. Anschließend wurde wiederum eine Topographieaufnahme durchgeführt und wie im Beispiel 1 beschrieben vermessen. Es ergab sich ein Volumen von 2,617 mm3 auf einer Fläche von 50,69 mm2. Dies entspricht wiederum einem freien Volumen V1 von 0,052, einem freien Volumen V2 von 0,264 mm3/mm2 . The FIGS. 2a and 2b show a corresponding representation of the profile thus obtained. Again, the roll was measured. The roughness was Rz according to DIN EN ISO 4287 496 μm. Subsequently, a topography uptake was again carried out and measured as described in Example 1. The result was a volume of 2.617 mm 3 on an area of 50.69 mm 2 . This again corresponds to a free volume V 1 of 0.052, a free volume V 2 of 0.264 mm 3 / mm 2 .

Beispiel 3Example 3

Eine Walze wie im Beispiel 1 wurde mit einer Leistung von 600 W behandelt, so dass die Vertiefungen tiefer ausgeführt sind.A roll as in Example 1 was treated with a power of 600 W, so that the depressions are made deeper.

Die Figuren 3a und 3b zeigen eine entsprechende Topographieaufnahme. Hieran wurde ebenfalls die Rauheitswerte gemessen. Es ergab sich ein Rz nach DIN EN ISO 4287 von 613 µm. Anschließend wurde eine Topographieaufnahme hinsichtlich des Füllvolumens vermessen. Dies ist in den Figuren 4a und 4b dargestellt. Es ergab sich ein Volumen von 3,511 mm3 auf einer Fläche von 50,69 mm2. Dies entspricht einem freien Volumen von 0,069 mm3/mm2, das freie Volumen V2 0,292 mm3/mm2 . The FIGS. 3a and 3b show a corresponding Topographieaufnahme. The roughness values were also measured thereon. The result was a Rz according to DIN EN ISO 4287 of 613 microns. Subsequently, a Topographieaufnahme was measured in terms of filling volume. This is in the FIGS. 4a and 4b shown. The result was a volume of 3.511 mm 3 on an area of 50.69 mm 2 . This corresponds to a free volume of 0.069 mm 3 / mm 2 , the free volume V 2 0.292 mm 3 / mm 2 .

Im Vergleich zu einer nichtgelaserten Oberfläche zeigte sich beim Einsatz eine verbesserte Evakuierung der Vertiefungen der Filmwalze, ein geringeres Verspritzen der Farbe, ein geringeren Abrieb an der nachfolgenden elastomerbezogenen Walze, ein verbessertes Reinigungsverhalten sowie eine höhere Gleichmäßigkeit des übertragenen Farbfilms und damit eine Erhöhung der Druckqualität, insbesondere bei empfindlichen Sujets.Compared to a non-lasered surface, there was improved evacuation of the film roller wells, less splash of paint, less wear on the subsequent elastomeric roller, improved cleaning performance, and improved uniformity of the transferred color film, and thus an increase in print quality. especially with sensitive subjects.

Claims (9)

  1. A film roller for offset printing having a surface with projections and recesses, characterized in that said projections and recesses form an irregular random pattern, wherein said recesses and the projections that project beyond the original surface are formed by displacing material of the surface.
  2. The film roller according to claim 1, characterized in that its peak-to-valley height, Rz, is from 200 to 1000 µm.
  3. The film roller according to claim 1 or 2, characterized in that the surface of the film roller consists of polyamide, polyurethane, copper, ceramics or brushed chromium.
  4. The film roller according to any of claims 1 to 3, characterized in that its free volume V1 is from 0.005 to 0.5 mm3/mm2.
  5. The film roller according to any of claims 1 to 4, characterized in that the free volume V1 in the peripheral area of the roller is lower by up to 20% as compared to the middle of the roller.
  6. An ink unit comprising an ink-duct roller, a forme roller and a film roller according to any of claims 1 to 5.
  7. A process for preparing a film roller according to any of claims 1 to 5, comprising the step of treating the surface with a laser to produce an irregular random pattern of projections and recesses.
  8. A process for the transport of a printing ink in offset printing, comprising the following steps:
    - transport of a printing ink from an ink duct onto an ink duct roller;
    - transport of the printing ink from the ink duct roller onto a film roller having a surface with projections and recesses that form an irregular random pattern, wherein said recesses and the projections that project beyond the original surface are formed by displacing material of the surface.
  9. Use of a film roller according to any of claims 1 to 5 for ink transport in an ink unit in offset printing.
EP07787681.1A 2006-07-19 2007-07-18 Stochastically lasered film roller Active EP2040931B1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
PL07787681T PL2040931T3 (en) 2006-07-19 2007-07-18 Stochastically lasered film roller
EP07787681.1A EP2040931B1 (en) 2006-07-19 2007-07-18 Stochastically lasered film roller
SI200731988T SI2040931T1 (en) 2006-07-19 2007-07-18 Stochastically lasered film roller
CY20171101248T CY1119627T1 (en) 2006-07-19 2017-11-28 MOVIE CYLINDER LASER TROUBLESHOOTING

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP06117496 2006-07-19
PCT/EP2007/057420 WO2008009699A1 (en) 2006-07-19 2007-07-18 Stochastically lasered film roller
EP07787681.1A EP2040931B1 (en) 2006-07-19 2007-07-18 Stochastically lasered film roller

Publications (2)

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EP2040931A1 EP2040931A1 (en) 2009-04-01
EP2040931B1 true EP2040931B1 (en) 2017-09-06

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US (1) US8561536B2 (en)
EP (1) EP2040931B1 (en)
JP (1) JP5543204B2 (en)
CN (1) CN101489799B (en)
AR (1) AR061915A1 (en)
CY (1) CY1119627T1 (en)
DK (1) DK2040931T3 (en)
ES (1) ES2650975T3 (en)
HU (1) HUE037324T2 (en)
PL (1) PL2040931T3 (en)
PT (1) PT2040931T (en)
SI (1) SI2040931T1 (en)
TW (1) TWI461306B (en)
WO (1) WO2008009699A1 (en)

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WO2011069998A1 (en) * 2009-12-07 2011-06-16 Felix Böttcher Gmbh & Co. Kg Oscillator rollers
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Publication number Publication date
TW200821157A (en) 2008-05-16
WO2008009699A1 (en) 2008-01-24
AR061915A1 (en) 2008-10-01
US8561536B2 (en) 2013-10-22
ES2650975T3 (en) 2018-01-23
CY1119627T1 (en) 2018-04-04
SI2040931T1 (en) 2018-04-30
HUE037324T2 (en) 2018-08-28
CN101489799A (en) 2009-07-22
JP2009543715A (en) 2009-12-10
TWI461306B (en) 2014-11-21
PT2040931T (en) 2017-12-12
US20090320700A1 (en) 2009-12-31
CN101489799B (en) 2012-09-26
DK2040931T3 (en) 2017-12-04
JP5543204B2 (en) 2014-07-09
EP2040931A1 (en) 2009-04-01
PL2040931T3 (en) 2018-02-28

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