EP1385702B1 - Cover element for a sheet guiding cylinder in a printing machine - Google Patents

Cover element for a sheet guiding cylinder in a printing machine Download PDF

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Publication number
EP1385702B1
EP1385702B1 EP02737978A EP02737978A EP1385702B1 EP 1385702 B1 EP1385702 B1 EP 1385702B1 EP 02737978 A EP02737978 A EP 02737978A EP 02737978 A EP02737978 A EP 02737978A EP 1385702 B1 EP1385702 B1 EP 1385702B1
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EP
European Patent Office
Prior art keywords
coating
covering element
sealing layer
sheet
element according
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.)
Revoked
Application number
EP02737978A
Other languages
German (de)
French (fr)
Other versions
EP1385702A1 (en
Inventor
Gerhard Johner
Markus Kirst
Ruth Kremer
Rainer Schneider
Uwe Wilms
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
Praxair ST Technology Inc
Praxair Technology Inc
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Publication date
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Application filed by MAN Roland Druckmaschinen AG, Praxair ST Technology Inc, Praxair Technology Inc filed Critical MAN Roland Druckmaschinen AG
Publication of EP1385702A1 publication Critical patent/EP1385702A1/en
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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
    • B41N7/00—Shells for rollers of printing machines
    • 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
    • B41N2207/00—Location or type of the layers in shells for rollers of printing machines
    • B41N2207/02—Top layers
    • 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
    • B41N2207/00—Location or type of the layers in shells for rollers of printing machines
    • B41N2207/04—Intermediate layers
    • 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
    • B41N2207/00—Location or type of the layers in shells for rollers of printing machines
    • B41N2207/10—Location or type of the layers in shells for rollers of printing machines characterised by inorganic compounds, e.g. pigments
    • 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
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12389—All metal or with adjacent metals having variation in thickness
    • 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
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12993—Surface feature [e.g., rough, mirror]

Definitions

  • the invention relates to an elevator for a sheet guiding cylinder in a processing machine, in particular a printing or varnishing machine, according to the preambles of claim 1.
  • Elevators for sheet guiding cylinders are in use in printing machines, especially in perfecting presses.
  • a sheet guiding cylinder such as a counter-pressure cylinder to be printed or painted now on the second (top) page.
  • the fresh paint or the paint from the first page of the sheet on the lateral surface by paint / paint splitting deposit.
  • the outer surface of the sheet guiding cylinder must be cleaned so as not to affect the printed image of the subsequent sheets.
  • Such an elevator is known from DE 28 20 549 A1.
  • the elevator here referred to as sheet guide foil, has a two-layered layer structure.
  • the first layer a carrier film with recesses produced on the side to be printed by blasting and the second layer is a covering layer of nickel which is arranged on the surface roughened by the blasting treatment.
  • the durability of such a coating is particularly affected by the protruding elevations of the surface due to wear (relative movement between the substrate and the surface of the surveys) and the color splitting behavior is in need of improvement.
  • an elevator film in which the surface provided for contact with the material to be printed is provided with statistically uniformly distributed, equally high structural elements in the form of spherical caps.
  • Such an elevator can be made by electroforming a metallic carrier sheet or pressing a high modulus plastic film to form the dome therein, followed by depositing a chromium topcoat to equalize the microroughness of the surface of the dome in the carrier sheet. The small thickness of the cover layer limits the life of the elevator.
  • a single or multilayer jacket for a sheet guiding cylinder is known.
  • the jacket has a grease-resistant, wear-resistant outer layer of nickel and / or chromium with a minimum proportion of 30%.
  • admixtures of the elements Molybdenum, tungsten, cobalt, aluminum, boron, manganese, titanium, magnesium and cerium are fed.
  • a sealing substance preferably Teflon or copying lacquer, is introduced into the pores of this outer layer.
  • the invention is based on the object to provide an elevator of the type mentioned above, which avoids the disadvantages mentioned, which is particularly easier to remove as a sealing elevator from the sheet guiding cylinder and having a surface with improved color fading behavior and with significantly reduced wear.
  • a first advantage is due to the fact that the elevator has a special layer structure with a color / paint-repellent surface, which improves the color / paint splitting.
  • the build-up of paint or varnish on the surface of the elevator arranged on a sheet guiding cylinder resulting from the cleavage is noticeably minimized.
  • Another advantage is that, in the case of a printed or painted side, one of the lateral surface of the elevator worn sheet material a significant reduction in the color delivery behavior is recognizable. This leads to a noticeable increase in print quality, especially in multi-color printing in perfecting mode.
  • the elevator or the elevators with the special coating can be arranged in a detachable manner on a single or multiple-sized sheet guiding cylinder, relative to a single-sized forming or plate cylinder, or are.
  • For an exchange of the elevator or the lifts on a sheet guiding cylinder can be realized with short set-up times.
  • the surface of the elevator forms a reduced contact surface to the printed side of the sheet material.
  • the contact surface is formed by a plurality of irregularly arranged, substantially conical elevations with rounded profile crests, resulting in a low bearing ratio.
  • the contact surface is additionally minimized by a preferred structuring of the layer structure.
  • the elevator designed according to the invention can be used universally on sheet guiding cylinders in processing machines.
  • Such sheet guiding cylinders can be used in printing presses (with or without coating units), preferably for multicolor printing and in perfecting mode, as well as in varnishing machines, preferably for multiple varnishes and in perfecting printing.
  • a sheet-fed rotary printing press has at least printing units for the multi-color printing and preferably coating units.
  • Each printing unit has a sheet guiding cylinder as a printing cylinder 3, wherein the printing cylinder 3, a blanket cylinder 2 and the blanket cylinder 2, a plate cylinder 1 is assigned.
  • the turning drum 4 is double-sized, is mounted on the frame side and has two peripherally symmetrical (180 ° offset) arranged sheet holding systems for sheet transport in beautiful or perfecting.
  • Double-sized impression cylinder 3 On the arranged in the conveying direction after the turning drum 4 Double-sized impression cylinder 3 are each a first elevator 5 and a second elevator 6 detachably arranged on a surface 10 of the printing cylinder 3 to form a curved, the sheet-guiding jacket surface 11.
  • the attachment of the lifts 5, 6 takes place on the printing cylinder 3 by means of clamping means at the beginning of printing 8 and clamping means at the printing end 9, which are arranged in at least one cylinder channel 7.
  • the sheet holding systems are arranged in the cylinder channel 7.
  • the elevators 5, 6 are each designed as a laminated body with three layers, identical in construction. At the end, the elevators 5, 6, in particular the carrier material 12, each have a region 15. This area 15 serves to fix the elevators 5, 6 in clamping means 8, 9.
  • a carrier material 12 (1st layer) is flexible and preferably metallic, for example, formed from a stainless steel sheet, and is associated with its underside of the surface 10 of the printing cylinder 3.
  • the carrier material 12 carries on the upper side a coating 13 (2nd layer), which is adhesively bonded to the carrier material 12.
  • the coating 13 (2nd layer) carries a sealing layer 14 (3rd layer) associated with the printing material, which is adhesively bonded to the coating 13.
  • the coating 13 is structured with a surface profile.
  • the layer thickness is between 10 and 120 ⁇ m and the roughness R z is 5 to 60 ⁇ m.
  • the coating 13 is formed with an irregular surface profile, preferably with randomly distributed, pointed conical elevations (pointed cone 18) with profiled ends 16 arranged at the end, with the smallest possible carrying proportion and recessed Profile valleys 17.
  • a surface profile of the coating 13 can be achieved during the coating process itself or subsequently by etching the coating 13.
  • the surface profile of the coating 13 and the sealing layer 14, which is substantially adapted to the contour of the pointed cones 18, is preferably formed in a vertical section (FIG. 4) by individual and / or interlinked pointed cones 18 with rounded profile caps 16.
  • the coating 13 consists of metals such as chromium, iron, titanium, nickel, cobalt or tungsten, their oxides such as Al 2 O 3 , TiO 2 , Cr 2 O 3 , SiO 2 , or ZrO 2 , their carbides such as WC or Cr 3 C 2 or silicides of these metals, mixtures or alloys thereof, such as NiCr.
  • pure molybdenum (Mo) can be used as the material for the coating 13.
  • Mo molybdenum
  • This material Mo has in addition to favorable sliding properties on a high work hardening under mechanical stress, so that after a short period of operation an optimally solidified surface of the coating 13 is present.
  • the slip properties of the molybdenum coating 13 can be improved during operation by forming very thin molybdenum disulfide (MoS 2 ) layers through the interaction between the molybdenum and the sulfidic components of the mineral oil-bound paints.
  • MoS 2 molybdenum disulfide
  • the coating powder up to 30 vol.% Added, so that the superior sliding properties of such a molybdenum layer immediately effective.
  • tungsten carbide / cobalt (WC / Co) can be used as the preferred material for the coating 13.
  • the coating 13 may be applied directly to the substrate 12 or indirectly by means of an adhesion promoter.
  • the application of the coating 13 to the substrate 12 is preferably realized in the thermal spraying process.
  • the surface structure of the coating 13 is subsequently improved in an embodiment by a slight grinding, polishing or removal of the surface.
  • the color-repellent character of the coating 13 can be improved by the sealing layer 14.
  • the sealing layer 14 is realized by a low surface energy material according to claim 1.
  • fluorinated acrylates but also other fluoropolymers, for example, on the basis of PTEF and fluorine-containing copolymers can be used.
  • polyorganosiloxanes their hydrocarbon radicals, preferably methyl groups but also other alkyls, such as phenyl or aryl groups can be incorporated.
  • Halogenated groups, in particular F or F compounds can furthermore be incorporated into these compounds.
  • the adhesion and the wear resistance of the sealing layer 14 is by curing at temperatures of 50 to 450 ° C can be improved.
  • the sealing layer 14 in particular the polysiloxanes, after exposure of the laminated body (elevator 5, 6) to a water vapor-saturated atmosphere.
  • t max. 120 ° C and a time ⁇ ⁇ 120 min is a residual crosslinking of free SiH groups, so that the sealing layer 14 is fully polymerized.
  • migration additives in the form of polydimethylsiloxanes having terminally bound groups can be incorporated into the sealing layer 14, in particular when polysiloxanes are used.
  • the migration additives are preferably admixable to the sealant during the production of the sealing layer 14.
  • a sheet guiding cylinder with removably arranged elevators 5, 6 is not limited to the formation of a double-sized printing cylinder 3. Rather, single-sized sheet guiding cylinders with a base body and an elevator 5 or 3 to 4-fold sheet guiding cylinder with 3- or 4-symmetrically arranged on the circumference of the body lifts 5, 6 executable.
  • the inventive design is further not limited to printing cylinder 3, but is in all bow-leading cylinders, for example in investment drums, transfer drum, transfer drum, printing cylinders used.

Landscapes

  • Printing Plates And Materials Therefor (AREA)
  • Registering, Tensioning, Guiding Webs, And Rollers Therefor (AREA)
  • Printing Methods (AREA)
  • Machines For Manufacturing Corrugated Board In Mechanical Paper-Making Processes (AREA)
  • Electroluminescent Light Sources (AREA)
  • Photoreceptors In Electrophotography (AREA)

Abstract

A printing and/or varnishing machine having a plurality of sheet-guiding cylinders in which at least one of the cylinders has an outer detachable packing which has enhanced ink repellent characteristics and which significantly reduces wear. The packing has a layered structure which includes a flexible backing material 12 , the underside of which is assigned to the base body of the sheet-guiding cylinder 3 , a coating 13 of molybdenum or tungsten carbide/cobalt which is adhesively applied to the upper side of the backing material 12 , and a sealing layer 14 of a material made from the group of polysiloxanes which is adhesively applied to the upper side of the coating 13 . The side of the packings 5, 6 which faces the material to be printed has a surface profile consisting of cones 18 with rounded tips 16 for reduced sheet contact.

Description

Die Erfindung betrifft einen Aufzug für einen Bogenführungszylinder in einer Verarbeitungsmaschine, insbesondere einer Druck- oder Lackiermaschine, nach den Oberbegriffen von Anspruch 1.The invention relates to an elevator for a sheet guiding cylinder in a processing machine, in particular a printing or varnishing machine, according to the preambles of claim 1.

[Stand der Technik][State of the art]

Aufzüge für Bogenführungszylinder sind in Druckmaschinen, insbesondere bei Schön- und Widerdruckmaschinen, im Einsatz. Im Schön- und Widerdruck wird ein Bogen, nachdem die erste Seite bedruckt oder lackiert und gewendet wurde, von einem Bogenführungszylinder, beispielsweise einem Gegendruckzylinder getragen, um nunmehr auf der zweiten (oben liegenden) Seite bedruckt oder lackiert zu werden. Dabei kann die frische Farbe bzw. der Lack von der ersten Seite des Bogens auf die Mantelfläche durch Farb-/ Lackspaltung ablegen. Die Mantelfläche des Bogenführungszylinders muss gereinigt werden, um das Druckbild der nachfolgenden Bogen nicht zu beeinträchtigen.Elevators for sheet guiding cylinders are in use in printing machines, especially in perfecting presses. In perfecting a sheet after the first page has been printed or painted and turned, carried by a sheet guiding cylinder, such as a counter-pressure cylinder to be printed or painted now on the second (top) page. In this case, the fresh paint or the paint from the first page of the sheet on the lateral surface by paint / paint splitting deposit. The outer surface of the sheet guiding cylinder must be cleaned so as not to affect the printed image of the subsequent sheets.

Ein derartiger Aufzug ist aus DE 28 20 549 A1 bekannt. Der Aufzug, hier als Bogenführungsfolie bezeichnet, weist einen zweilagigen Schichtaufbau auf. Dabei ist die erste Schicht eine Trägerfolie mit auf der dem Bedruckstoff zugewandten Seite durch eine Strahlbehandlung erzeugten Vertiefungen und die zweite Schicht ist eine Deckschicht aus Nickel, welche auf der durch die Strahlbehandlung aufgerauten Oberfläche angeordnet ist. Die Dauerhaftigkeit einer solchen Beschichtung ist insbesondere durch die hervorstehenden Erhebungen der Oberfläche durch Abnutzung (Relativbewegung zwischen Bedruckstoff und der Oberfläche der Erhebungen) beeinträchtigt und das Farbspaltungsverhalten ist verbesserungsbedürftig.Such an elevator is known from DE 28 20 549 A1. The elevator, here referred to as sheet guide foil, has a two-layered layer structure. Here is the first layer a carrier film with recesses produced on the side to be printed by blasting and the second layer is a covering layer of nickel which is arranged on the surface roughened by the blasting treatment. The durability of such a coating is particularly affected by the protruding elevations of the surface due to wear (relative movement between the substrate and the surface of the surveys) and the color splitting behavior is in need of improvement.

Gemäß EP 0 017 776 A1 ist eine Aufzugsfolie bekannt, bei der die zum Kontakt mit dem zu bedruckenden Material vorgesehene Oberfläche mit statistisch gleichmäßig verteilten, gleich hohen Strukturelementen in Form von Kugelkalotten versehen ist. Ein solcher Aufzug ist herstellbar durch Galvanoformung einer metallischen Trägerfolie oder durch Pressen einer Kunststofffolie mit hohem Elastizitätsmodul, um darin die Kalotten zu formen, gefolgt von der Abscheidung einer Deckschicht aus Chrom zum Ausgleichen der Mikrorauigkeit der Oberfläche der Kalotten in der Trägerfolie. Die geringe Dicke der Deckschicht begrenzt die Lebensdauer des Aufzuges.According to EP 0 017 776 A1, an elevator film is known, in which the surface provided for contact with the material to be printed is provided with statistically uniformly distributed, equally high structural elements in the form of spherical caps. Such an elevator can be made by electroforming a metallic carrier sheet or pressing a high modulus plastic film to form the dome therein, followed by depositing a chromium topcoat to equalize the microroughness of the surface of the dome in the carrier sheet. The small thickness of the cover layer limits the life of the elevator.

Aus DE 42 30 567 A1 ist eine Weiterbildung eines Aufzuges bekannt, bei dem die konvex ausgebildeten Strukturelemente eine ovale Form mit vom Pol einer Erhebung zum Übergang in die konvexen Strukturelemente größer werdenden Krümmungsradius aufweisen.From DE 42 30 567 A1 a development of an elevator is known in which the convex structural elements have an oval shape with the pole of a survey to the transition into the convex structural elements increasing radius of curvature.

Aus DE 29 14 255 A1 ist ein ein- oder mehrschichtiger Mantel für einen Bogenführungszylinder bekannt. Der Mantel weist eine fettabstoßende, verschleißfeste Außenschicht aus Nickel und/oder Chrom mit einem Mindestanteil von 30% auf. Diesem Mindestanteil sind zusätzlich Beimengungen der Elemente Molybdän, Wolfram, Kobalt, Aluminium, Bor, Mangan, Titan Magnesium und Zer zugeführt. In einer Ausbildung ist in die Poren dieser Außenschicht ein Siegelstoff, bevorzugt Teflon oder Kopierlack, eingebracht.From DE 29 14 255 A1 a single or multilayer jacket for a sheet guiding cylinder is known. The jacket has a grease-resistant, wear-resistant outer layer of nickel and / or chromium with a minimum proportion of 30%. In addition to this minimum proportion are admixtures of the elements Molybdenum, tungsten, cobalt, aluminum, boron, manganese, titanium, magnesium and cerium are fed. In one embodiment, a sealing substance, preferably Teflon or copying lacquer, is introduced into the pores of this outer layer.

Weiterhin ist aus DE 198 50 968 A1 eine verschleißhemmende farbabweisende Beschichtung - geeignet für Druckmaschinenkomponenten - aus einem Material von Metalloxiden oder verschleißarmen Hartmetallen bekannt. Diese Beschichtung ist zusätzlich mit einem Siegelstoff der Gruppe der Polyorganosiloxane behandelt.Furthermore, from DE 198 50 968 A1 discloses a wear-retardant paint-repellent coating - suitable for printing press components - from a material of metal oxides or low-wear hard metals known. This coating is additionally treated with a sealant of the group of polyorganosiloxanes.

[Aufgabe der Erfindung]OBJECT OF THE INVENTION

Der Erfindung liegt die Aufgabe zu Grunde, einen Aufzug der eingangs genannten Art zu schaffen, der die genannten Nachteile vermeidet, der insbesondere als ein Versiegelungsaufzug einfacher vom Bogenführungszylinder entfernbar ist und der eine Oberfläche mit einem verbesserten Farbspaltungsverhalten und mit spürbar reduziertem Verschleiß aufweist.The invention is based on the object to provide an elevator of the type mentioned above, which avoids the disadvantages mentioned, which is particularly easier to remove as a sealing elevator from the sheet guiding cylinder and having a surface with improved color fading behavior and with significantly reduced wear.

Die Aufgabe wird durch die Ausbildungsmerkmale des Ansprüchs 1 gelöst. Weiterbildungen ergeben sich aus den Unteransprüchen.The object is achieved by the training features of Ansprüchs 1. Further developments emerge from the subclaims.

Ein erster Vorteil ist darin begründet, dass der Aufzug einen speziellen Schichtaufbau mit einer farb-/ lackabstoßenden Oberfläche aufweist, welche die Farb-/ Lackrückspaltung verbessert. Das aus der Rückspaltung resultierende Aufbauen von Farbe bzw. Lack auf der Oberfläche des auf einem Bogenführungszylinder angeordneten Aufzuges ist spürbar minimiert.A first advantage is due to the fact that the elevator has a special layer structure with a color / paint-repellent surface, which improves the color / paint splitting. The build-up of paint or varnish on the surface of the elevator arranged on a sheet guiding cylinder resulting from the cleavage is noticeably minimized.

Ein weiterer Vorteil besteht darin, dass bei einer bedruckten bzw. lackierten Seite eines von der Mantelfläche des Aufzuges getragenen Bogenmaterials eine deutliche Verringerung des Farbabgabeverhaltens erkennbar ist. Dies führt zu einer spürbaren Steigerung der Druckqualität, insbesondere beim Mehrfarbendruck in der Betriebsart Schön- und Widerdruck.Another advantage is that, in the case of a printed or painted side, one of the lateral surface of the elevator worn sheet material a significant reduction in the color delivery behavior is recognizable. This leads to a noticeable increase in print quality, especially in multi-color printing in perfecting mode.

Vorteilhaft ist ebenso, dass der Aufzug bzw. die Aufzüge mit der speziellen Beschichtung schnell lösbar an einem einfach- oder mehrfachgroßen Bogenführungszylinder, bezogen auf einen einfachgroßen Form- bzw. Plattenzylinder, anordenbar ist bzw. sind. Damit ist bei kurzen Rüstzeiten ein Austausch des Aufzuges bzw. der Aufzüge an einem Bogenführungszylinder realisierbar.It is also advantageous that the elevator or the elevators with the special coating can be arranged in a detachable manner on a single or multiple-sized sheet guiding cylinder, relative to a single-sized forming or plate cylinder, or are. For an exchange of the elevator or the lifts on a sheet guiding cylinder can be realized with short set-up times.

Von Vorteil ist weiterhin, dass die Oberfläche des Aufzuges eine reduzierte Kontaktfläche zur bedruckten Seite des Bogenmaterials bildet. Die Kontaktfläche ist dabei durch eine Vielzahl von unregelmäßig angeordneten, im wesentlichen spitzkegeligen Erhebungen mit gerundeten Profilkuppen gebildet, wodurch sich ein geringer Traganteil ergibt. Die Kontaktfläche ist durch eine bevorzugte Strukturierung des Schichtaufbaues zusätzlich minimierbar.Another advantage is that the surface of the elevator forms a reduced contact surface to the printed side of the sheet material. The contact surface is formed by a plurality of irregularly arranged, substantially conical elevations with rounded profile crests, resulting in a low bearing ratio. The contact surface is additionally minimized by a preferred structuring of the layer structure.

Schließlich ist es vorteilhaft, dass der erfindungsgemäß ausgebildete Aufzug universell auf Bogenführungszylindern in Verarbeitungsmaschinen einsetzbar ist. Derartige Bogenführungszylinder sind in Druckmaschinen (mit oder ohne Lackwerken), bevorzugt für den Mehrfarbendruck und im Schön- und Widerdruckbetrieb, als auch in Lackiermaschinen, bevorzugt für Mehrfachlackierungen und im Schön- und Widerdruckbetrieb, einsetzbar.Finally, it is advantageous that the elevator designed according to the invention can be used universally on sheet guiding cylinders in processing machines. Such sheet guiding cylinders can be used in printing presses (with or without coating units), preferably for multicolor printing and in perfecting mode, as well as in varnishing machines, preferably for multiple varnishes and in perfecting printing.

[Beispiele][Examples]

Die Erfindung soll an einem Ausführungsbeispiel näher erläutert werden.The invention will be explained in more detail using an exemplary embodiment.

Dabei zeigen:

Fig. 1
ein Bogenführungszylinder mit Aufzug in einer Druckmaschine für den Schön- bzw. Schön- und Widerdruck,
Fig. 2
die Anordnung eines Aufzuges auf einem einfachgroßen Bogenführungszylinder,
Fig. 3
einen Aufzug als Schichtkörper (im Schnitt),
Fig. 4
ein Oberflächenprofil (vergrößerter Ausschnitt) im Senkrechtschnitt.
Showing:
Fig. 1
a sheet guiding cylinder with elevator in a printing machine for the perfecting,
Fig. 2
the arrangement of a lift on a single-sized sheet guiding cylinder,
Fig. 3
an elevator as a laminated body (in section),
Fig. 4
a surface profile (enlarged detail) in vertical section.

Eine Bogenrotationsdruckmaschine weist zumindest Druckwerke für den Mehrfarbendruck sowie bevorzugt Lackwerke auf. Jedes Druckwerk weist einen Bogenführungszylinder als Druckzylinder 3 auf, wobei dem Druckzylinder 3 ein Gummituchzylinder 2 und dem Gummituchzylinder 2 ein Plattenzylinder 1 zugeordnet ist. Zwischen den Druckwerken, speziell zwischen den bogenführenden Druckzylindern 3, ist wenigstens eine Wendetrommel 4, beispielsweise nach dem Prinzip der Ein-Trommel- oder der Drei-Trommelwendung, für den Bogentransport zum nachfolgenden Druckwerk/Lackwerk angeordnet.A sheet-fed rotary printing press has at least printing units for the multi-color printing and preferably coating units. Each printing unit has a sheet guiding cylinder as a printing cylinder 3, wherein the printing cylinder 3, a blanket cylinder 2 and the blanket cylinder 2, a plate cylinder 1 is assigned. Between the printing units, especially between the sheet-guiding printing cylinders 3, at least one turning drum 4, for example, according to the principle of single-drum or three-drum application, arranged for the sheet transport to the subsequent printing unit / coating unit.

Im vorliegenden Beispiel (Fig. 1) ist die Wendetrommel 4 doppeltgroß ausgebildet, ist gestellseitig gelagert und weist zwei umfangsseitig symmetrisch (180° versetzt) angeordnete Bogenhaltesysteme für den Bogentransport im Schön- bzw. Schön- und Widerdruck auf.In the present example (Fig. 1), the turning drum 4 is double-sized, is mounted on the frame side and has two peripherally symmetrical (180 ° offset) arranged sheet holding systems for sheet transport in beautiful or perfecting.

Auf dem in Förderrichtung nach der Wendetrommel 4 angeordneten doppeltgroßen Druckzylinder 3 sind jeweils ein erster Aufzug 5 und ein zweiter Aufzug 6 lösbar auf einer Oberfläche 10 des Druckzylinders 3 zur Bildung einer gekrümmten, die Bogen führenden Mantelfläche 11 angeordnet. Bevorzugt erfolgt die Befestigung der Aufzüge 5, 6 am Druckzylinder 3 mittels Spannmitteln am Druckanfang 8 und Spannmitteln am Druckende 9, welche in wenigstens einem Zylinderkanal 7 angeordnet sind. Bevorzugt sind im Zylinderkanal 7 die Bogenhaltesysteme angeordnet.On the arranged in the conveying direction after the turning drum 4 Double-sized impression cylinder 3 are each a first elevator 5 and a second elevator 6 detachably arranged on a surface 10 of the printing cylinder 3 to form a curved, the sheet-guiding jacket surface 11. Preferably, the attachment of the lifts 5, 6 takes place on the printing cylinder 3 by means of clamping means at the beginning of printing 8 and clamping means at the printing end 9, which are arranged in at least one cylinder channel 7. Preferably, the sheet holding systems are arranged in the cylinder channel 7.

Die Aufzüge 5, 6 sind jeweils als ein Schichtkörper mit drei Schichten, baugleich im Aufbau, ausgebildet. Endseitig weisen die Aufzüge 5, 6, insbesondere das Trägermaterial 12, je einen Bereich 15 auf. Dieser Bereich 15 dient der Fixierung der Aufzüge 5, 6 in Spannmitteln 8, 9.The elevators 5, 6 are each designed as a laminated body with three layers, identical in construction. At the end, the elevators 5, 6, in particular the carrier material 12, each have a region 15. This area 15 serves to fix the elevators 5, 6 in clamping means 8, 9.

Ein Trägermaterial 12 (1. Schicht) ist biegsam und vorzugsweise metallisch, beispielsweise aus einem rostfreien Edelstahlblech, ausgebildet und ist mit seiner Unterseite der Oberfläche 10 des Druckzylinders 3 zugeordnet. Das Trägermaterial 12 trägt an der Oberseite eine Beschichtung 13 (2.Schicht), welche haftfest mit dem Trägermaterial 12 verbunden ist. Die Beschichtung 13 (2.Schicht) trägt eine dem Bedruckstoff zugeordnete Versiegelungsschicht 14 (3.Schicht), welche mit der Beschichtung 13 haftfest verbunden ist.A carrier material 12 (1st layer) is flexible and preferably metallic, for example, formed from a stainless steel sheet, and is associated with its underside of the surface 10 of the printing cylinder 3. The carrier material 12 carries on the upper side a coating 13 (2nd layer), which is adhesively bonded to the carrier material 12. The coating 13 (2nd layer) carries a sealing layer 14 (3rd layer) associated with the printing material, which is adhesively bonded to the coating 13.

Die Beschichtung 13 ist mit einem Oberflächenprofil strukturiert ausgebildet. Die Schichtdicke beträgt zwischen 10 und 120µm und die Rauheit Rz beträgt 5 bis 60µm.The coating 13 is structured with a surface profile. The layer thickness is between 10 and 120 μm and the roughness R z is 5 to 60 μm.

Die Beschichtung 13 ist mit einem unregelmäßigen Oberflächenprofil ausgebildet, vorzugsweise mit zufällig verteilten, spitzkegeligen Erhebungen (Spitzkegel 18) mit endseitig angeordneten Profilkuppen 16 bei einem möglichst geringen Traganteil sowie vertieften Profiltälern 17. Ein derartiges Oberflächenprofil der Beschichtung 13 ist bei dem Beschichtungsprozess selbst oder nachträglich durch Ätzen der Beschichtung 13 erzielbar. Bevorzugt ist das Oberflächenprofil von Beschichtung 13 und der im Wesentlichen der Kontur der Spitzkegel 18 angepassten Versiegelungsschicht 14 im Senkrechtschnitt (Fig. 4) durch einzelne und/oder verkettete, voneinander beabstandete Spitzkegel 18 mit gerundeten Profilkuppen 16 gebildet.The coating 13 is formed with an irregular surface profile, preferably with randomly distributed, pointed conical elevations (pointed cone 18) with profiled ends 16 arranged at the end, with the smallest possible carrying proportion and recessed Profile valleys 17. Such a surface profile of the coating 13 can be achieved during the coating process itself or subsequently by etching the coating 13. The surface profile of the coating 13 and the sealing layer 14, which is substantially adapted to the contour of the pointed cones 18, is preferably formed in a vertical section (FIG. 4) by individual and / or interlinked pointed cones 18 with rounded profile caps 16.

Weiterhin ist eine Vorbehandlung der zum Bedruckstoff zeigenden Oberseite des Trägermaterials 12 der Aufzüge 5, 6 vor dem Aufbringen der Beschichtung 13 durch Strahlen, Bürsten, Prägen, Gravieren, Funkenerosion, Laserbehandlung oder ein rein chemisches oder elektrochemisches Ätzverfahren realisierbar.Furthermore, a pretreatment of the top of the carrier material 12 of the elevators 5, 6, which faces the substrate, before the application of the coating 13 by blasting, brushing, embossing, engraving, spark erosion, laser treatment or a purely chemical or electrochemical etching process can be realized.

Die Beschichtung 13 besteht aus Metallen wie Chrom, Eisen, Titan, Nickel, Kobalt oder Wolfram, deren Oxide wie Al2O3, TiO2, Cr2O3, SiO2, oder ZrO2, deren Karbide wie WC oder Cr3C2 bzw. Silizide dieser Metalle, Mischungen oder Legierungen davon, wie z.B. NiCr.The coating 13 consists of metals such as chromium, iron, titanium, nickel, cobalt or tungsten, their oxides such as Al 2 O 3 , TiO 2 , Cr 2 O 3 , SiO 2 , or ZrO 2 , their carbides such as WC or Cr 3 C 2 or silicides of these metals, mixtures or alloys thereof, such as NiCr.

In einer bevorzugten Ausbildung ist als Werkstoff für die Beschichtung 13 reines Molybdän (Mo) einsetzbar. Dieser Werkstoff Mo weist neben günstigen Gleiteigenschaften eine hohe Kaltverfestigung bei mechanischer Beanspruchung auf, sodass nach kurzer Betriebszeit eine optimal verfestigte Oberfläche der Beschichtung 13 vorliegt.In a preferred embodiment, pure molybdenum (Mo) can be used as the material for the coating 13. This material Mo has in addition to favorable sliding properties on a high work hardening under mechanical stress, so that after a short period of operation an optimally solidified surface of the coating 13 is present.

Die Gleiteigenschaften der Beschichtung 13 aus Molybdän sind während des Betriebes durch Bildung von sehr dünnen Molybdändisulfid (MoS2)-Schichten durch die Wechselwirkung zwischen dem Molybdän und den sulfidischen Bestandteilen der Mineralöl-gebundenen Farben verbesserbar. Alternativ ist in einer weiteren Ausbildung MoS2 dem Beschichtungspulver bis zu 30 Vol.% beimengbar, sodass die überlegenen Gleiteigenschaften einer derartigen Molybdänschicht sofort wirksam werden.The slip properties of the molybdenum coating 13 can be improved during operation by forming very thin molybdenum disulfide (MoS 2 ) layers through the interaction between the molybdenum and the sulfidic components of the mineral oil-bound paints. Alternatively is in one Further training MoS 2 the coating powder up to 30 vol.% Added, so that the superior sliding properties of such a molybdenum layer immediately effective.

In einer weiteren Ausbildung ist als bevorzugter Werkstoff für die Beschichtung 13 Wolframcarbid/Kobalt (WC/Co) einsetzbar.In a further embodiment, tungsten carbide / cobalt (WC / Co) can be used as the preferred material for the coating 13.

Die Beschichtung 13 kann direkt auf das Trägermaterial 12 aufgebracht werden oder indirekt mittels eines Haftvermittels. Der Auftrag der Beschichtung 13 auf das Trägermaterial 12 ist bevorzugt im thermischen Spritzverfahren realisierbar. Die Oberflächenstruktur der Beschichtung 13 ist in einer Ausbildung anschließend durch ein leichtes Schleifen, Polieren oder Abziehen der Oberfläche verbesserbar.The coating 13 may be applied directly to the substrate 12 or indirectly by means of an adhesion promoter. The application of the coating 13 to the substrate 12 is preferably realized in the thermal spraying process. The surface structure of the coating 13 is subsequently improved in an embodiment by a slight grinding, polishing or removal of the surface.

Der farbabweisende Charakter der Beschichtung 13 ist durch die Versiegelungsschicht 14 verbesserbar. Die Versiegelungsschicht 14 ist durch einen Werkstoff mit niedriger Oberflächenenergie nach Anspruch 1 realisierbar. Hierzu sind fluorierte Acrylate, aber auch andere Fluorpolymere z.B., auf der Basis von PTEF und fluorhaltige Copolymere einsetzbar. Alternativ sind Polyorganosiloxane, deren Kohlenwasserstoffreste, bevorzugt Methylgruppen aber auch andere Alkyle, wie z.B. Phenyl- oder Arylgruppen einlagerbar. In diese Verbindungen sind weiterhin halogenierte Gruppen, insbesondere F bzw. F-Verbindungen einbaubar. Die Haftung sowie der Verschleißwiderstand der Versiegelungsschicht 14 ist durch Aushärtung bei Temperaturen von 50 bis 450°C verbesserbar.The color-repellent character of the coating 13 can be improved by the sealing layer 14. The sealing layer 14 is realized by a low surface energy material according to claim 1. For this purpose, fluorinated acrylates, but also other fluoropolymers, for example, on the basis of PTEF and fluorine-containing copolymers can be used. Alternatively, polyorganosiloxanes, their hydrocarbon radicals, preferably methyl groups but also other alkyls, such as phenyl or aryl groups can be incorporated. Halogenated groups, in particular F or F compounds, can furthermore be incorporated into these compounds. The adhesion and the wear resistance of the sealing layer 14 is by curing at temperatures of 50 to 450 ° C can be improved.

Zur Erhöhung der Verschleißfestigkeit sowie der farb-/ lackabweisenden Wirkung ist die Versiegelungsschicht 14, insbesondere die Polysiloxane, nach Erzeugung des Schichtkörpers (Aufzug 5,6) einer wasserdampfgesättigten Atmosphäre auszusetzen. Bei Temperaturen von tmax. = 120° C und einer Zeit τ < 120 min erfolgt eine Restvernetzung freier SiH-Gruppen, sodass die Versiegelungsschicht 14 auspolymerisiert ist.To increase the wear resistance and the color / paint-repellent effect, the sealing layer 14, in particular the polysiloxanes, after exposure of the laminated body (elevator 5, 6) to a water vapor-saturated atmosphere. At temperatures of t max. = 120 ° C and a time τ <120 min is a residual crosslinking of free SiH groups, so that the sealing layer 14 is fully polymerized.

In einer weiteren Ausbildung sind in die Versiegelungsschicht 14, insbesondere bei Einsatz von Polysiloxanen, Migrationsadditive in Form von Polydimethylsiloxanen mit endständig abgebundenen Gruppen einlagerbar. Bevorzugt sind die Migrationsadditive bei der Erzeugung der Versiegelungsschicht 14 zum Siegelstoff zumischbar.In a further embodiment, migration additives in the form of polydimethylsiloxanes having terminally bound groups can be incorporated into the sealing layer 14, in particular when polysiloxanes are used. The migration additives are preferably admixable to the sealant during the production of the sealing layer 14.

Die Ausbildung eines Bogenführungszylinders mit lösbar angeordneten Aufzügen 5, 6 ist nicht auf die Ausbildung eines doppeltgroßen Druckzylinders 3 beschränkt. Vielmehr sind einfachgroße Bogenführungszylinder mit einem Grundkörper und einem Aufzug 5 oder 3- bis 4-fach große Bogenführungszylinder mit 3- bzw. 4-symmetrisch am Umfang des Grundkörpers angeordneten Aufzügen 5, 6 etc. ausführbar. Die erfindungsgemäße Ausbildung ist weiterhin nicht auf Druckzylinder 3 beschränkt, sondern ist bei allen Bogen führenden Zylindern, beispielsweise bei Anlagetrommeln, Transfertrommel, Umführtrommel, Druckzylindern einsetzbar.The formation of a sheet guiding cylinder with removably arranged elevators 5, 6 is not limited to the formation of a double-sized printing cylinder 3. Rather, single-sized sheet guiding cylinders with a base body and an elevator 5 or 3 to 4-fold sheet guiding cylinder with 3- or 4-symmetrically arranged on the circumference of the body lifts 5, 6 executable. The inventive design is further not limited to printing cylinder 3, but is in all bow-leading cylinders, for example in investment drums, transfer drum, transfer drum, printing cylinders used.

[Bezugszeichenliste][REFERENCE LIST]

11
Plattenzylinderplate cylinder
22
GummituchzylinderBlanket cylinder
33
Druckzylinderpressure cylinder
44
Wendetrommelbeater
55
erster Aufzugfirst elevator
66
zweiter Aufzugsecond elevator
77
Zylinderkanalcylinder gap
88th
Spannmittel (Druckanfang)Clamping device (beginning of printing)
99
Spannmittel (Druckende)Clamping device (end of print)
1010
Oberflächesurface
1111
Mantelflächelateral surface
1212
Trägermaterialsupport material
1313
Beschichtungcoating
1414
Versiegelungsschichtsealing layer
1515
BereichArea
1616
Profilkuppeprofile summit
1717
Profiltalprofile valley
1818
Spitzkegelpointed cone

Claims (7)

  1. Covering element for a sheet guiding cylinder in a multicolour printing machine, the sheet guiding cylinder having a cylindrical base body with at least one sheet holding system arranged thereon and at least one detachably arranged covering element,
    characterized in that
    the covering element (5, 6) has the following layer structure:
    - a flexible carrier material (12), whose underside is assigned to the base body of the sheet guiding cylinder (3),
    - a coating (13) arranged to adhere firmly to the upper side of the carrier material (12) and having an irregular surface profile made of
    - metals such as chromium, iron, molybdenum, titanium, nickel, cobalt or tungsten, their oxides such as Al2O3, TiO2, Cr2O3, SiO2 or ZrO2, their carbides such as WC or Cr3C2, or silicides of these metals, mixtures or alloys thereof, such as NiCr,
    - a sealing layer (14) arranged to adhere firmly to the upper side of the coating (13) and from the group of polyorganosiloxanes or the group of fluorinated acrylates or the group of fluoropolymers.
  2. Covering element according to Claim 1,
    characterized in that the coating (13) is made of molybdenum and the sealing layer (14) is from the group of polyorganosiloxanes.
  3. Covering element according to Claim 1,
    characterized in that the coating (13) is made of tungsten carbide/cobalt and the sealing layer (14) is from the group of polyorganosiloxanes.
  4. Covering an element according to Claim 1,
    characterized in that the covering element (5, 6) has a surface profile facing the printing material of pointed cones (18) with rounded profiled domes (16).
  5. Covering element according to Claim 1,
    characterized in that the polyorganosiloxanes of the sealing layer (14) can be polymerized completely under a water vapour saturated atmosphere.
  6. Covering element according to Claim 1,
    characterized in the sealing layer (14) of polysiloxanes contains migration additives in the form of polydimethylsiloxanes.
  7. Covering element according to Claim 1,
    characterized in that the coating (13) of molybdenum contains up to 30% by volume of MoS2.
EP02737978A 2001-04-26 2002-04-22 Cover element for a sheet guiding cylinder in a printing machine Revoked EP1385702B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE20107183U DE20107183U1 (en) 2001-04-26 2001-04-26 Elevator for a sheet guiding cylinder in a processing machine
DE20107183U 2001-04-26
PCT/EP2002/004387 WO2002087883A1 (en) 2001-04-26 2002-04-22 Film for a sheet guiding cylinder in a processing machine

Publications (2)

Publication Number Publication Date
EP1385702A1 EP1385702A1 (en) 2004-02-04
EP1385702B1 true EP1385702B1 (en) 2007-03-21

Family

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Application Number Title Priority Date Filing Date
EP02737978A Revoked EP1385702B1 (en) 2001-04-26 2002-04-22 Cover element for a sheet guiding cylinder in a printing machine

Country Status (9)

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US (1) US7104195B2 (en)
EP (1) EP1385702B1 (en)
JP (2) JP2004525805A (en)
CN (1) CN100341696C (en)
AT (1) ATE357338T1 (en)
DE (2) DE20107183U1 (en)
ES (1) ES2283564T3 (en)
PT (1) PT1385702E (en)
WO (1) WO2002087883A1 (en)

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DE102009045752A1 (en) 2009-10-16 2011-04-21 Manroland Ag Blanket for use in impression cylinder of sheet-fed printing machine that is utilized for e.g. front-side printing, has layer turned away from printing ink and positioned in carrier layer, where carrier layer is aluminum layer

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US20060169155A1 (en) 2006-08-03
JP2004525805A (en) 2004-08-26
PT1385702E (en) 2007-06-08
ATE357338T1 (en) 2007-04-15
CN1610613A (en) 2005-04-27
ES2283564T3 (en) 2007-11-01
JP2008213495A (en) 2008-09-18
US7104195B2 (en) 2006-09-12
DE50209775D1 (en) 2007-05-03
WO2002087883A1 (en) 2002-11-07
EP1385702A1 (en) 2004-02-04
CN100341696C (en) 2007-10-10
DE20107183U1 (en) 2001-07-05

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