EP0384104B1 - Method for producing plastics cylinders for printing in general, in particular for rotogravure and flexography, and the cylinder obtained - Google Patents

Method for producing plastics cylinders for printing in general, in particular for rotogravure and flexography, and the cylinder obtained Download PDF

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Publication number
EP0384104B1
EP0384104B1 EP90100253A EP90100253A EP0384104B1 EP 0384104 B1 EP0384104 B1 EP 0384104B1 EP 90100253 A EP90100253 A EP 90100253A EP 90100253 A EP90100253 A EP 90100253A EP 0384104 B1 EP0384104 B1 EP 0384104B1
Authority
EP
European Patent Office
Prior art keywords
layer
tube
inner tube
expanded material
expanded
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
EP90100253A
Other languages
German (de)
French (fr)
Other versions
EP0384104A1 (en
Inventor
Felice Rossini
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.)
Erminio Rossini SpA
Original Assignee
Erminio Rossini SpA
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Publication date
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Application filed by Erminio Rossini SpA filed Critical Erminio Rossini SpA
Publication of EP0384104A1 publication Critical patent/EP0384104A1/en
Application granted granted Critical
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Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
    • B41C1/00—Forme preparation
    • B41C1/18—Curved printing formes or printing 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
    • B41N1/22—Curved printing plates, especially cylinders made of other substances

Definitions

  • This present invention relates to a method for producing plastics cylinders as described in the preamble of the main claim.
  • the patent also relates to the cylinder obtained by said method.
  • NL-A-8 302 811 describes a pressure or printing cylinder comprising a core cylinder, a layer of flexible material around such a cylinder, a shell located around the layer and carrying a plurality of clichés or print forms (print moulds).
  • the core cylinder has shaft-trunnions on which bearings and a drive-toothed wheel are mounted. All these parts are made of non-deformable material such as metal or synthetic material.
  • the layer around the core is made of slightly flexible material such as foam like a material, e.g. polyurethane foam with open cells; the layer is connected to the core by means of a glue.
  • the shell around the layer is made of not deformable material such as metal or synthetic material. It supports the print forms made of rubber elastic material or photopolymeric material, said print forms are joined to the shell by means of double-sided glue tape.
  • the shell is not connected to the synthetic foam layer but is tightly arranged around it with a slight contact pressure and is kept in place by means of friction forces which generate during the use of the pressure cylinder.
  • the prior solution has many drawbacks.
  • it has a plurality of parts (core, layer, shell) separated each other in a very well defined way and this can cause dangerous relative movements between the parts during the use of the cylinder which are detrimental to the quality of printing.
  • An object of the present invention is to provide a method for producing cylinders for printing in general, and in particular rotogravure and flexography, which is very simple to implement using any suitable apparatus.
  • a further object is to provide a method of the aforesaid type which enables plastics printing cylinders to be produced which are of maximum reliability and low weight, so that they can be easily handled and stored.
  • a further object is to provide a method which enables a plastics printing cylinder to be produced, the diameter of which can be varied at will during its production, without encountering particular difficulty.
  • a glass fibre fabric or yarn impregnated with epoxy resin is wound about a perfectly cylindrical steel mandrel having a ground, lapped and chromium-plated surface, until a thickness of between 1.5 and 2 mm is obtained.
  • the structure is then polymerized in conventional manner at a temperature of between 80° C and 120° C.
  • the resultant tube is then mounted on the central shaft of a casting mould consisting of a cylinder in which said shaft is centrally positioned and which has its inner surface perfectly ground and lapped.
  • the mould is tightly closed and a quantity of polyurethane is introduced such that the final expanded product will have a density of 0,480 kg/dm3, said polyurethan being prepared by mixing isocyanate and polyol in stoichiometric proportion in a mixing machine.
  • Both the components and the mould are temperature-controlled at 20-35° C, and preferably at 30° C.
  • the structure obtained can be made electrically conductive by applying a silver or nickel-based paint by spray or brush to a thickness of 200 ⁇ c. Copper is then applied in an electroplating tank to a thickness sufficient to enable the required engraving of the cylinder surface to be effected, this thickness being advantageously 500 ⁇ C.
  • the thickness of the expanded polyurethane layer can be varied according to requirements without varying the dimensions of the internal tube, to enable cylinders of variable outer diameter to be mounted on the same standard support shaft.

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  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Printing Plates And Materials Therefor (AREA)
  • Printing Methods (AREA)
  • Ink Jet (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Laminated Bodies (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)

Abstract

The method according to the invention consists essentially of (a) preparing an inner cylindrical tube of self-supporting rigid material, advantageously epoxy resin reinforced with glass or carbon filament or fabric, (b) coating said cylindrical tube with an expanded plastics material, advantageously rigid polyurethane, (c) making the outer surface of said coating perfectly smooth, (d) making said outer smooth surface of the expanded material electro-conductive by applying metallic materials in any manner, and (e) making said electro-conductive surface engravable, advantageously by applying electroplated copper or applying engravable materials or photopolymer type.

Description

  • This present invention relates to a method for producing plastics cylinders as described in the preamble of the main claim. The patent also relates to the cylinder obtained by said method.
  • Many methods have been proposed for producing plastics printing cylinders, however such known methods are extremely complicated and difficult to implement, in particular with regard to coating the basic plastics cylinder with metal, as is apparent for example from USA patent 4,503,769 in the name of Andersen Dennis. In addition, cylinders produced by conventional methods are of poor reliability or indeed unreliable.
  • As is well known, currently used cylinders of good reliability are those of steel construction, and rarely of aluminium, and thus various problems arise including those of their weight and their need for dynamic balancing.
  • Further drawbacks are well known to the expert of the art.
  • NL-A-8 302 811 describes a pressure or printing cylinder comprising a core cylinder, a layer of flexible material around such a cylinder, a shell located around the layer and carrying a plurality of clichés or print forms (print moulds).
  • The core cylinder has shaft-trunnions on which bearings and a drive-toothed wheel are mounted. All these parts are made of non-deformable material such as metal or synthetic material.
  • The layer around the core is made of slightly flexible material such as foam like a material, e.g. polyurethane foam with open cells; the layer is connected to the core by means of a glue.
  • The shell around the layer is made of not deformable material such as metal or synthetic material. It supports the print forms made of rubber elastic material or photopolymeric material, said print forms are joined to the shell by means of double-sided glue tape. The shell is not connected to the synthetic foam layer but is tightly arranged around it with a slight contact pressure and is kept in place by means of friction forces which generate during the use of the pressure cylinder.
  • The prior solution has many drawbacks. In particular, it has a plurality of parts (core, layer, shell) separated each other in a very well defined way and this can cause dangerous relative movements between the parts during the use of the cylinder which are detrimental to the quality of printing.
  • An object of the present invention is to provide a method for producing cylinders for printing in general, and in particular rotogravure and flexography, which is very simple to implement using any suitable apparatus.
  • A further object is to provide a method of the aforesaid type which enables plastics printing cylinders to be produced which are of maximum reliability and low weight, so that they can be easily handled and stored.
  • A further object is to provide a method which enables a plastics printing cylinder to be produced, the diameter of which can be varied at will during its production, without encountering particular difficulty.
  • These and further objects of the invention, that will be apparent to the expert of the art from the following description, are obtained by a method as set in the characterizing part of the main claim.
  • The stages of the method according to the invention will be apparent from the following example.
  • A glass fibre fabric or yarn impregnated with epoxy resin is wound about a perfectly cylindrical steel mandrel having a ground, lapped and chromium-plated surface, until a thickness of between 1.5 and 2 mm is obtained. The structure is then polymerized in conventional manner at a temperature of between 80° C and 120° C.
  • The resultant tube is then mounted on the central shaft of a casting mould consisting of a cylinder in which said shaft is centrally positioned and which has its inner surface perfectly ground and lapped. The mould is tightly closed and a quantity of polyurethane is introduced such that the final expanded product will have a density of 0,480 kg/dm³, said polyurethan being prepared by mixing isocyanate and polyol in stoichiometric proportion in a mixing machine.
  • Both the components and the mould are temperature-controlled at 20-35° C, and preferably at 30° C.
  • On removing the structure consisting of the tube and expanded coating from the mould the surface of this coating is perfectly smooth due to the action of the inner mould surface. The structure is checked for perfect cylindricity and if necessary can be ground until of correct geometry.
  • The structure obtained can be made electrically conductive by applying a silver or nickel-based paint by spray or brush to a thickness of 200 µc. Copper is then applied in an electroplating tank to a thickness sufficient to enable the required engraving of the cylinder surface to be effected, this thickness being advantageously 500 µC.
  • The thickness of the expanded polyurethane layer can be varied according to requirements without varying the dimensions of the internal tube, to enable cylinders of variable outer diameter to be mounted on the same standard support shaft.

Claims (7)

  1. A method for producing plastic cylinders for printing of the type comprising an inner cylindrical core or tube of not-deformable material, an intermediate layer of flexible materials such as expanded material located around the core, and an outer layer or shell, said cylinders being in particular for rotogravure and flexography, characterized by comprising the following stages:
    a) preparing the inner tube by winding a glass or carbon yarn or fabric impregnated with epoxy resin about a cylindrical steel mandrel having a ground and lapped surface until a thickness of between 1.5 and 2 mm is obtained, the structure being then polymerized in conventional manner at a temperature of between 80°C and 120°C;
    b) coating said inner tube with expanded material, the coating being obtained by locating the tube on the central shaft of a casting mould comprising a cylinder in which said shaft is centrally positioned and having its inner surface perfectly ground and lapped, the mould being tightly closed and a quantity of expanding material, suitably poliurethane, being introduced, the latter intimately connecting to the inner tube;
    c) applying an electroconductive paint onto the expanded material layer or intermediate layer; and
    d) electroplating an engravable surface to said intermediate layer through said electroconductive paint so to define the outer layer or shell, the inner tube, the intermediate layer and the outer layer defining a substantially single piece body.
  2. A method as claimed in Claim 1, in which the intermediate layer has a density of 0,480 kg/dm³.
  3. A method as claimed in claim 1, in which the inner tube, the expanding material and the mould are temperature-controlled at 20-35°C, and preferably at 30° C.
  4. A method as claimed in claim 1, in which the structure comprisig the intimately-connected inner tube and expanded material layer is checked for perfect cylindricity and, when necessary, is grounded until the correct geometry is attained.
  5. A method as claimed in claim 1, in which the application of the electroconductive paint is made by spraying or brushing it onto the expanded material layer.
  6. A method as claimed in claim 1, in which the connection of the engravable surface to the expanded material layer is obtained according to galvanic process per se known by applying said surface in an electroplating tank.
  7. A cylinder for printing, in particular for rotogravure and flexography, obtained according to the method claimed in claim 1, characterized by comprising an inner cylindrical tube made of glass or carbon yarn or fabric, an expanded plastic material layer connected to said tube and engravable surface connected to said layer, said tube, layer and surface being intimately connected to each other so to define a substantially one piece body.
EP90100253A 1989-02-23 1990-01-08 Method for producing plastics cylinders for printing in general, in particular for rotogravure and flexography, and the cylinder obtained Expired - Lifetime EP0384104B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT1954189 1989-02-23
IT8919541A IT1228855B (en) 1989-02-23 1989-02-23 PROCEDURE FOR OBTAINING PLASTIC CYLINDERS FOR GENERAL PRINTING, IN PARTICULAR ROTOCALCO AND FLEXOGRAPHY, AND CYLINDER SO OBTAINED.

Publications (2)

Publication Number Publication Date
EP0384104A1 EP0384104A1 (en) 1990-08-29
EP0384104B1 true EP0384104B1 (en) 1994-09-21

Family

ID=11158901

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90100253A Expired - Lifetime EP0384104B1 (en) 1989-02-23 1990-01-08 Method for producing plastics cylinders for printing in general, in particular for rotogravure and flexography, and the cylinder obtained

Country Status (9)

Country Link
EP (1) EP0384104B1 (en)
JP (1) JPH02248291A (en)
AT (1) ATE111805T1 (en)
AU (1) AU622809B2 (en)
CA (1) CA2009087A1 (en)
DE (1) DE69012605T2 (en)
DK (1) DK0384104T3 (en)
ES (1) ES2063170T3 (en)
IT (1) IT1228855B (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5345864A (en) * 1991-09-25 1994-09-13 Sulzer-Escher Wyss Ag Printing cylinder of a rotary printing press and a method for use therewith
DE19545597A1 (en) * 1995-12-06 1997-06-12 Polywest Kunststofftechnik Shell for printing or screen roll
EP0787597A2 (en) 1996-01-31 1997-08-06 POLYWEST KUNSTSTOFFTECHNIK Saueressig & Partner GmbH & Co. KG Sleeve for an intaglio printing cylinder, fabrication process therefore and working procedure of the manufacturing machine
US5735206A (en) * 1995-03-20 1998-04-07 Erminio Rossini, Spa Deformable mandrels for rotary printing cylinders
US5782181A (en) * 1995-03-14 1998-07-21 Erminio Rossini S.P.A. Concentric double sleeve for a rotary printing cylinder
US5819657A (en) * 1996-03-11 1998-10-13 Ermino Rossini, Spa Air carrier spacer sleeve for a printing cylinder

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2059222B1 (en) * 1991-07-01 1995-10-01 Nacional Moneda Timbre IMPROVEMENTS INTRODUCED IN ORIGINAL RECORDING REPRODUCTION SYSTEMS.
DE19633643A1 (en) * 1996-08-21 1998-03-05 Schepers Druckformtechnik Gmbh Printing roller or cylinder with a core made of metal or plastic and method for producing the same
PT1171304E (en) * 1999-04-07 2004-01-30 Hyperplast Ltd PERFORATED ROLLS FOR GRAPHICS PRINTING
GB0128469D0 (en) * 2001-11-28 2002-01-16 Keating Gravure Systems Uk Ltd Printing cylinder manufacture
EP1543962B1 (en) * 2003-12-19 2006-11-29 Fischer & Krecke Gmbh & Co. Gravure cylinder
WO2007132734A1 (en) * 2006-05-11 2007-11-22 Think Laboratory Co., Ltd. Photogravure roll and process for manufacturing the same
DE202008009068U1 (en) * 2008-04-07 2008-09-18 Sächsische Walzengravur GmbH Gravure printing or embossing mold as sleeve or cylinder
EP2202084A1 (en) * 2008-12-22 2010-06-30 Müller Martini Holding AG Roller for a printer, printer with the roller and method for producing the roller
DE102009007678B4 (en) 2009-02-03 2010-12-16 Sächsische Walzengravur GmbH Sleeve as a gravure mold
DE102009009919A1 (en) 2009-02-18 2010-08-19 Sächsische Walzengravur GmbH Gravure printing plate for e.g. rotogravure printing application, has intermediate layer, separation layer and material layer or structured layer or base layer arranged on carrier, where separation layer serves for removal of material layer
DE102009010081A1 (en) 2009-02-18 2010-08-19 Sächsische Walzengravur GmbH Gravure printing- and embossing mold for use as e.g. sleeve, has functional layer formed as electrically non-conductive polymer layer with electrically conductive layer, and electro-plated metal layer provided on functional layer
DE102009010080A1 (en) 2009-02-18 2010-08-19 Sächsische Walzengravur GmbH Gravure printing form for use as gravure cylinder sleeve, has intermediate layer, separating layer and structured hard material layer arranged one after another on carrier, where hard material layer consists of nickel based alloy
JP5000682B2 (en) * 2009-05-01 2012-08-15 旭化成イーマテリアルズ株式会社 Laser-engravable cylindrical flexographic printing plate
DE202014001960U1 (en) 2014-02-27 2014-03-20 Sächsische Walzengravur GmbH Printing or embossing mold

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2051681B (en) * 1979-06-25 1983-03-02 Drg Ltd Printing rolls
EP0038385A1 (en) * 1980-04-14 1981-10-28 Karl D. Bardin Metal plated plastic base intaglio printing cylinders and plates, process and apparatus
US4503769A (en) * 1982-06-21 1985-03-12 Armotek Industries, Inc. Metal coated thin wall plastic printing cylinder for rotogravure printing
NL8302811A (en) * 1983-08-10 1985-03-01 Anderson & Vreeland Bv Ink transfer and/or its high-relief print cylinder - has plastic foam on rigid core and holding rigid ink grid or print plate carrier bush
JPS62196189A (en) * 1986-02-25 1987-08-29 Showa Denko Kk Roll material for photogravure

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5345864A (en) * 1991-09-25 1994-09-13 Sulzer-Escher Wyss Ag Printing cylinder of a rotary printing press and a method for use therewith
US5782181A (en) * 1995-03-14 1998-07-21 Erminio Rossini S.P.A. Concentric double sleeve for a rotary printing cylinder
US5735206A (en) * 1995-03-20 1998-04-07 Erminio Rossini, Spa Deformable mandrels for rotary printing cylinders
DE19545597A1 (en) * 1995-12-06 1997-06-12 Polywest Kunststofftechnik Shell for printing or screen roll
DE19545597C2 (en) * 1995-12-06 1999-01-07 Polywest Kunststofftechnik Process for producing a sleeve for printing or anilox rollers
EP0787597A2 (en) 1996-01-31 1997-08-06 POLYWEST KUNSTSTOFFTECHNIK Saueressig & Partner GmbH & Co. KG Sleeve for an intaglio printing cylinder, fabrication process therefore and working procedure of the manufacturing machine
DE19603500A1 (en) * 1996-01-31 1997-08-07 Polywest Kunststofftechnik Sleeve for a rotogravure roller, process for its production and working method of the device for the production
US5819657A (en) * 1996-03-11 1998-10-13 Ermino Rossini, Spa Air carrier spacer sleeve for a printing cylinder

Also Published As

Publication number Publication date
CA2009087A1 (en) 1990-08-23
AU5708490A (en) 1991-12-19
IT8919541A0 (en) 1989-02-23
IT1228855B (en) 1991-07-05
EP0384104A1 (en) 1990-08-29
ATE111805T1 (en) 1994-10-15
AU622809B2 (en) 1992-04-16
DK0384104T3 (en) 1995-02-13
JPH02248291A (en) 1990-10-04
DE69012605D1 (en) 1994-10-27
DE69012605T2 (en) 1995-01-19
ES2063170T3 (en) 1995-01-01

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