EP1171304B1 - Tiefdruckzylinder - Google Patents

Tiefdruckzylinder Download PDF

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Publication number
EP1171304B1
EP1171304B1 EP00917187A EP00917187A EP1171304B1 EP 1171304 B1 EP1171304 B1 EP 1171304B1 EP 00917187 A EP00917187 A EP 00917187A EP 00917187 A EP00917187 A EP 00917187A EP 1171304 B1 EP1171304 B1 EP 1171304B1
Authority
EP
European Patent Office
Prior art keywords
shell
gravure roller
roller according
coating
roller
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.)
Expired - Lifetime
Application number
EP00917187A
Other languages
English (en)
French (fr)
Other versions
EP1171304A1 (de
Inventor
Robert Malcolm Moss
John William Campion
Sidney Robert Armfield
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.)
Hyperlast Ltd
Original Assignee
Hyperlast Ltd
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
Priority claimed from GBGB9907784.4A external-priority patent/GB9907784D0/en
Priority claimed from GBGB9913643.4A external-priority patent/GB9913643D0/en
Application filed by Hyperlast Ltd filed Critical Hyperlast Ltd
Publication of EP1171304A1 publication Critical patent/EP1171304A1/de
Application granted granted Critical
Publication of EP1171304B1 publication Critical patent/EP1171304B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F13/00—Common details of rotary presses or machines
    • B41F13/08—Cylinders
    • B41F13/10—Forme cylinders
    • B41F13/11—Gravure cylinders
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41N—PRINTING PLATES OR FOILS; MATERIALS FOR SURFACES USED IN PRINTING MACHINES FOR PRINTING, INKING, DAMPING, OR THE LIKE; PREPARING SUCH SURFACES FOR USE AND CONSERVING THEM
    • B41N1/00—Printing plates or foils; Materials therefor
    • B41N1/16—Curved printing plates, especially cylinders
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41N—PRINTING PLATES OR FOILS; MATERIALS FOR SURFACES USED IN PRINTING MACHINES FOR PRINTING, INKING, DAMPING, OR THE LIKE; PREPARING SUCH SURFACES FOR USE AND CONSERVING THEM
    • B41N1/00—Printing plates or foils; Materials therefor
    • B41N1/16—Curved printing plates, especially cylinders
    • B41N1/20—Curved printing plates, especially cylinders made of metal or similar inorganic compounds, e.g. plasma coated ceramics, carbides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • 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

Definitions

  • This invention relates to improvements in gravure printing rollers.
  • gravure printing rollers are usually machined to the required size from stainless steel.
  • Stainless steel rollers are however extremely heavy which is a major disadvantage, both from the point of view of transportation, and also in changing rollers in a printing machine.
  • rollers of a lower weight material such as a composite including a relatively low density synthetic material which retains a durable printing face such as chrome treated copper, yet is light to ease shipping and handling.
  • WO 99/32302 proposes a printing roller comprising a body of low density hard foam, and a surface layer comprising a non-foamed polyurethane including 15 - 70% filler such as chalk.
  • ROSSINI, EP-A-384,104 describes a roll comprising a stiff inner core, having a shell of rigid expanded polyurethane, which is smoothed and electroplated with a layer of copper.
  • BARDIN, EP-A-0038385 forms a roll by moulding a body of plastics material, machines the roll to size and plates the machined surface with copper.
  • EP-A-0364,653 describes a roller which comprises a substrate which includes hollow microspheres. The printing surface is produced by grinding and rupturing the microspheres to provide a roughened surface to aid ink retention.
  • KINYOSHI EP-A-0,344,332 describes a roller with mineral particles embedded in a surface layer. The surface provides a surface which pits and projects at the particle scale, which again is said to aid ink retention.
  • the invention provides a gravure roller comprising a lightweight shell made from a syntatic moulding composition comprising a polyurethane matrix containing hollow microspheres, characterised in that the shell (15) has a non-porous machine surface with a printing face of chrome treated copper deposited on the surface.
  • a syntactic moulding composition is defined for the purpose of this specification as being a synthetic matrix including preformed beads providing discrete bubbles. This composition is capable of providing a uniform cellular construction of homogenous and consistent density which can be machined without leaving a porous or void containing surface.
  • the syntactic moulding composition preferably comprises a polyurethane composition formed into preformed plastics beads each comprising an individual shell surrounding an interior void and bonded by a polyurethane composition.
  • the beads may be in the size range of 20 to 100 ⁇ m (microns) (weight average diameter) and may alternatively comprise other polymers, glass, or ceramic beads.
  • the invention also provides a method of manufacturing gravure roller, comprising moulding a roller shell from a syntatic moulding composition comprising a polyurethane matrix containing hollow microspheres, machining the peripheral surface of said roller shell to produce a non-porous machined surface and depositing a layer of chrome treated copper on the surface to provide a printing face.
  • the shell may advantageously be mechanically reinforced, to prevent flexure of the roller, by means of a rigid tubular core upon which the shell is moulded.
  • the core may be for example of glass reinforced plastics, or a concrete composition.
  • the polyurethane used in the moulding composition can be manufactured from a range of ingredients.
  • polyether or polyester polyols may be used, with any of the common isocyanates; including methylene diphenyl diisocyanate; toluene diisocyanate; naphthalene diisocyanate; tetramethyl xylidene diisocyanate; isophorone diisocyanate; phenylene diisocyanate; cyclohexyl diisocyanate; xylidene diisocyanate; hexamethylene diisocyanate; as well as biuret, allophanate and prepolymeric adducts of these.
  • Diol, triol, polyol or polyamine crosslinkers may be used, with an amine or metal catalyst which is preferably of a type which negates blowing reaction in the moulding step following bead expansion.
  • the isocyanate component may be pre-polymerised and contain the expansion agent so that the isocyanate component is a low density liquid whilst the polyol is a standard polyol.
  • a suitable composition may be as follow:- Polyol component:- (by weight ) Castor Oil - 46.8 Polyether hexol - 46.8 Antifoam - 0.19 Dessicant - 2.4 Catalysts - 0.25 Expancel 551DE - 3.59
  • Isocyanate - Polymeric methylene diphenyl diisocyanate (MDI) - 100% Mix ratio: 60 parts polyol to 50 parts of isocyanate Gel time at 25°C - 10 to 15 minutes Hardness - 70 shore D Density - 0.72 Viscosity polyol - 400 poise at 25°C
  • the moulding is carried out at 60°C in a low pressure two component polyurethane dispenser-2KM machine.
  • the surface of the syntactic moulding polyurethane composition is, after machining, preferably treated with a conductive coating to provide a host surface for the copper plating.
  • the conductive coating is preferably an organic solvent based composition containing one or more conductive agents.
  • the latter may comprise additions of conductive materials such as finely divided metals, or additives which adjust the ionic state of the coating to render it conductive.
  • rollers may be manufactured entirely from the syntactic moulding composition ,whilst in other possible embodiments, the roller shells are fitted with steel or aluminum end plates and/or shafts or trunnions.
  • rollers according to the invention may be used not only for gravure printing, but also for flexo printing.
  • a gravure roller 1 which comprises a roller body or shell 15.
  • the roller shell body 15 is made by moulding a syntactic polyurethane foam, which is then machined to achieve the desired diameter and produce a substantially non-porous and void-free outer surface 16, on which a layer of copper 17 is deposited after treatment with a conductive coating which provides adhesion for the copper, and then treated with chrome and processed as required to act as a gravure printing roller.
  • the roller also includes a tubular core 12, which acts as a support and reinforcing member to prevent or minimise flexure of the roller, with end caps 13, 14 formed with trunnions 11so that the roller 1 can be mounted in a machine.
  • the core is of a suitably strong material, such as glass reinforced plastics, or a concrete composition, particularly a resin bonded concrete.
  • the conductive composition is an organic based coating including a conductive agent such as powdered metal or ionic adjusting additives.
  • Figure 4 shows, much magnified, the surface 16 of the roller shell 15, wherein the bonded beads or bubbles 18 of polyurethane or other plastics foam are shown in a polyurethane matrix 19 and providing a substantially non-porous surface 16 free of major voids and with only micros-pits caused by the opening or removal of individual beads 18.
  • the beads may alternatively be of glass or ceramic material.
  • Figure 3 shows a machined surface 116 of a layer 115 of a normal open-celled foam which has, for example, been poured into the mould as liquid and allowed to cure and foam simultaneously in the mould.
  • the foam after planarising , has major voids 117 and pores 118 which, by linking of adjacent foam cell, often penetrate well in to the foam body so that the surface 116 is by no means non-porous or free voids.
  • the roller shell 15 is made by moulding a syntactic polyurethane foam. This is then machined to the required size, a coat of a special paint applied over the surface, copper deposited and the shell is then assembled into the roller structure for subsequent chromium plating, etching and use in printing.
  • the roller may weigh about 5 to 7 kg instead of the weight of 100 kg when steel is used for the roller shell.
  • the roller can be refurbished by recoating with copper and rechromium plating and etching.
  • the relatively light weight ensures that transportation and handling, including mounting and dismounting the roller is easy and imposes no handling problems.
  • a roller formerly requiring use of a 7.5 tonne truck for delivery of a set of rollers can now be delivered using a light weight van.
  • the other parts of the roller including the end plates, shaft and trunnions, can be made of reduced weight materials, e. g. lightweight metals such as aluminium alloys, or synthetic materials such as suitable rigid plastic materials including forming all or part of the roller from the syntactic foam material.
  • reduced weight materials e. g. lightweight metals such as aluminium alloys, or synthetic materials such as suitable rigid plastic materials including forming all or part of the roller from the syntactic foam material.
  • a preferred syntactic foam composition used in manufacture of the shell is preferably as set out above.
  • moulding may be carried out with a polyisocyanate composition, using a prepolymer with a polyester or polyether polyol, a friability modifier and an isocyanate catalyst such as DABCO TMR5.
  • a polyisocyanate composition using a prepolymer with a polyester or polyether polyol, a friability modifier and an isocyanate catalyst such as DABCO TMR5.
  • urethane derivatives can be polyoxazolidone produced by means of epoxy/isocyanate addition compositions.
  • the syntactic material can be based on other polymers such as unsaturated polyesters, vinyl esters or polyacrylic systems such as Modar (Trade Mark of ICI) can be used.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rolls And Other Rotary Bodies (AREA)
  • Printing Plates And Materials Therefor (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Electroplating Methods And Accessories (AREA)
  • Polyurethanes Or Polyureas (AREA)
  • Confectionery (AREA)
  • Manufacture Or Reproduction Of Printing Formes (AREA)
  • Impression-Transfer Materials And Handling Thereof (AREA)
  • Non-Silver Salt Photosensitive Materials And Non-Silver Salt Photography (AREA)
  • Holo Graphy (AREA)

Claims (10)

  1. Druckzylinder, der eine leichte Schale (15) aus einer syntaktischen Gießmasse mit einer Polyurethanmatrize umfasst, welche hohle Mikrokugeln (18) enthält, dadurch gekennzeichnet, dass die Schale (15) eine porenlose, maschinell bearbeitete Oberfläche (16) mit einer Druckfläche aus verchromtem Kupfer aufweist, das auf der Oberfläche (16) aufgebracht ist.
  2. Druckzylinder nach Anspruch 1, dadurch gekennzeichnet, dass auf der Oberfläche (16) eine leitfähige Schicht aufgebracht wird, bevor auf dieser die verchromte Kupferschicht aufgebracht wird.
  3. Druckzylinder nach Anspruch 1, wobei die hohlen Mikrokugeln hohle Perlen (18) umfassen, mit einer Schale aus Polyurethan-, Glas- oder Keramikmaterial bestehen, welche einen leeren Innenraum umschließen.
  4. Druckzylinder nach Anspruch 2, wobei die leitfähige Beschichtung eine Zusammensetzung auf der Basis eines organischen Lösungsmittels umfasst, welche ein oder mehrere elektrisch leitfähige Materialien enthält.
  5. Druckzylinder nach Anspruch 4, wobei das leitfähige Material oder die leitfähigen Materialien ein Additiv umfasst, das ein oder mehrere elektrisch leitfähige, fein verteilte Metalle enthält.
  6. Druckzylinder nach Anspruch 4, wobei das leitfähige Material ein Additiv umfasst, welches den lonenzustand der Beschichtung darauf einstellt, sie elektrisch leitfähig zu machen.
  7. Druckzylinder nach Anspruch 3, bei welchem die Perlen (18) einen Größenbereich von 20 bis 100 µm (Mikron) haben.
  8. Druckzylinder nach einem der vorhergehenden Ansprüche, bei welchem die Schale (15) auf einem Verstärkungskern ausgebildet ist.
  9. Verfahren zur Herstellung eines Druckzylinders, das die Folgendes umfasst:
    Gießen einer Zylinderschale (15) aus einer syntaktischen Gießmasse, die eine Polyurethanmatrize umfasst, welche hohle Mikrokugeln (18) enthält;
    maschinelle Bearbeitung der Umfangsoberfläche der Zylinderschale (15), um eine porenlose, maschinell bearbeitete Oberfläche (16) zu erzeugen und
    Aufbringen einer Schicht aus verchromtem Kupfer auf die Oberfläche (16), um eine Druckfläche (17) bereitzustellen.
  10. Verfahren nach Anspruch 9, umfassend die Beschichtung der maschinell bearbeiteten Oberfläche (16) mit einer leitfähigen Beschichtung vor dem Aufbringen der Schicht aus verchromtem Kupfer.
EP00917187A 1999-04-07 2000-04-06 Tiefdruckzylinder Expired - Lifetime EP1171304B1 (de)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
GBGB9907784.4A GB9907784D0 (en) 1999-04-07 1999-04-07 Improved gravure printing rollers
GB9907784 1999-04-07
GBGB9913643.4A GB9913643D0 (en) 1999-06-11 1999-06-11 Improved gravure printing rollers
GB9913643 1999-06-11
PCT/GB2000/001301 WO2000059727A1 (en) 1999-04-07 2000-04-06 Improved gravure printing rollers

Publications (2)

Publication Number Publication Date
EP1171304A1 EP1171304A1 (de) 2002-01-16
EP1171304B1 true EP1171304B1 (de) 2003-09-10

Family

ID=26315383

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00917187A Expired - Lifetime EP1171304B1 (de) 1999-04-07 2000-04-06 Tiefdruckzylinder

Country Status (9)

Country Link
EP (1) EP1171304B1 (de)
JP (1) JP4179752B2 (de)
AT (1) ATE249339T1 (de)
AU (1) AU3828100A (de)
DE (1) DE60005167T2 (de)
DK (1) DK1171304T3 (de)
ES (1) ES2207495T3 (de)
PT (1) PT1171304E (de)
WO (1) WO2000059727A1 (de)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB0128469D0 (en) 2001-11-28 2002-01-16 Keating Gravure Systems Uk Ltd Printing cylinder manufacture
GB2417711B (en) * 2003-05-02 2007-04-11 Hyperlast Ltd Manufacture of gravure printing rollers
WO2007068262A1 (de) * 2005-12-12 2007-06-21 Peter Weber Verfahren zur herstellung und/oder wiederaufbereitung von kernen für tiefdruckzylinder, kerne und einrichtung zur herstellung der kerne
CA2710691A1 (en) 2009-09-30 2011-03-30 Garry Machine Mfg. Inc. Process for refurbishing cylinder rolls and bases for printing machines

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0038385A1 (de) * 1980-04-14 1981-10-28 Karl D. Bardin Metallüberzogene Kunststoff-Intaglio-Druckzylinder und -Druckplatten, Verfahren und Apparat
EP0347456B1 (de) * 1987-10-05 1993-10-20 Kinyosha Co. Ltd. Tintenrolle für druckpressen und verfahren zur herstellung
JPH082643B2 (ja) * 1988-09-30 1996-01-17 株式会社東京機械製作所 印刷機のインキングローラーおよび印刷機のインキングローラーの製造方法
IT1228855B (it) * 1989-02-23 1991-07-05 Rossini Erminio Spa Procedimento per l'ottenimento di cilindri in materiale plastico per stampa in genere, in particolare rotocalco e flessografia, e cilindro cosi' ottenuto.
US6224526B1 (en) * 1997-12-19 2001-05-01 H.B. Fuller Licensing & Financing, Inc. Printing rollers

Also Published As

Publication number Publication date
DK1171304T3 (da) 2003-12-29
ATE249339T1 (de) 2003-09-15
JP2002540985A (ja) 2002-12-03
EP1171304A1 (de) 2002-01-16
PT1171304E (pt) 2004-01-30
JP4179752B2 (ja) 2008-11-12
ES2207495T3 (es) 2004-06-01
DE60005167D1 (de) 2003-10-16
WO2000059727A1 (en) 2000-10-12
DE60005167T2 (de) 2004-06-17
AU3828100A (en) 2000-10-23

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