EP1717056A1 - Cylindre ou manchon d'impression avec revêtement extérieur aux microcellules, ayant des cellules ouvertes à la surface et des cellules closes à l'interieur, et méthode pour sa production - Google Patents

Cylindre ou manchon d'impression avec revêtement extérieur aux microcellules, ayant des cellules ouvertes à la surface et des cellules closes à l'interieur, et méthode pour sa production Download PDF

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Publication number
EP1717056A1
EP1717056A1 EP05103430A EP05103430A EP1717056A1 EP 1717056 A1 EP1717056 A1 EP 1717056A1 EP 05103430 A EP05103430 A EP 05103430A EP 05103430 A EP05103430 A EP 05103430A EP 1717056 A1 EP1717056 A1 EP 1717056A1
Authority
EP
European Patent Office
Prior art keywords
sleeve
roller
component
polymer material
microcavities
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.)
Withdrawn
Application number
EP05103430A
Other languages
German (de)
English (en)
Inventor
Stefano Caroni
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.)
IMFC Licensing BV
Original Assignee
IMFC Licensing BV
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by IMFC Licensing BV filed Critical IMFC Licensing BV
Priority to EP05103430A priority Critical patent/EP1717056A1/fr
Publication of EP1717056A1 publication Critical patent/EP1717056A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41N—PRINTING PLATES OR FOILS; MATERIALS FOR SURFACES USED IN PRINTING MACHINES FOR PRINTING, INKING, DAMPING, OR THE LIKE; PREPARING SUCH SURFACES FOR USE AND CONSERVING THEM
    • B41N6/00—Mounting boards; Sleeves Make-ready devices, e.g. underlays, overlays; Attaching by chemical means, e.g. vulcanising
    • 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
    • B41N7/00—Shells for rollers of printing machines
    • B41N7/005—Coating of the composition; Moulding; Reclaiming; Finishing; Trimming
    • 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
    • B41N7/04—Shells for rollers of printing machines for damping 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
    • 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

Definitions

  • the present invention relates to a printing sleeve or roller in accordance with the introduction to the main claim.
  • the invention also relates to a method for producing the sleeve or roller.
  • Printing sleeves and rollers having different shapes and having a single body (of metal or completely constructed of polymer material, such as polyurethane) or comprising two or more cylindrical layer which are superimposed each other and which are made of the same material or different materials, such as glass-fibre, polyurethane or rubber, have been known for some time. These sleeves are used both in flexographic printing and in offset printing.
  • the sleeve is drawn over a suitable mandrel and supports the printing plates by interposing between these and the free surface of the sleeve a suitable known adhesive element having the double purpose of fixing the plate to the surface and providing a sort of damping element between the sleeve and plate.
  • This adhesive element usually has a thickness not less than 0.38 mm.
  • a wetting unit comprising a dispensing roller and a wetting unit for a roller carrying printing parts.
  • This roller and wetting roller unit transport water containing percentages of additives, such as isopropyl alcohol, able to reduce the surface tension of the water.
  • An object of the present invention is to provide a printing sleeve or printing roller, usable either for flexographic printing or for offset printing, which is able to solve the aforesaid problems related to the use of known solutions in such printing systems.
  • Another object is to provide a sleeve of the stated type which enables the costs of printing machines and of the printing operation itself to be reduced.
  • a further object is to provide a sleeve or roller of the stated type which is able to avoid the use of environmentally harmful additives in offset printing, hence reducing the cost thereof.
  • Another object is to provide a method by which a sleeve or roller of the stated type can be produced at low cost.
  • a sleeve or roller according to the invention is indicated overall by 1 and comprises a body 2.
  • the latter can be formed completely of polymer material such as polyurethane, or can have an inner portion (made of glass, resin, kevlar, carbon, nickel or copper) on which are located one or more layers made of polymeric material, rubber or other similar materials.
  • the inner portion and the layer are torsionally connected so as the body 2 acts as a single body.
  • the body 2 is completely made of polymeric material; it is tubular and presents a cavity 3 disposed along its axis W.
  • This body has a layered structure and, in particular, comprises a first portion 4 communicating with the cavity 3 and bounding this latter and at least one second portion having a surface 6 defining the free surface of the sleeve.
  • This latter can support printing plates if the sleeve or roller 1 is used for flexographic printing; alternatively it can be used to wet a plate if the sleeve or roller is used for offset printing.
  • the second portion 5 has a microcell structure with open cells at the surface, whereas the first portion 4 has a closed cell structure on the inside of the layer.
  • the structure 6 of the sleeve or roller 1 has high elastic return (for example between 5 and 40 lbs/inch) which, when used in a flexographic printing machine, enables very thin adhesive elements (for example from 0.07 to 0.10 mm) to be used for the printing plates, which adhesive elements can be rigid.
  • This enables production costs of a sleeve or roller for flexographic printing to be reduced and ensures a uniform linear point of contact between the printing plates positioned over the entire surface of the sleeve or roller and the element on which the printing is carried out. This improves print quality.
  • the open cell microcell structure of the second portion 5 has a high capacity for absorbing and distributing water uniformly in its rotary movement; this is particularly important when the sleeve or roller 1 is used for offset printing. In this manner the printing plate can be adequately wetted while limiting or possibly avoiding the use of additives in the wetting liquid. This enables the use of a material harmful to the environment to be totally or at least largely avoided, and the disposal of which would be costly, as in fact is the case with currently known methods.
  • the structure of the portion 5 has a density between 0.600 g/ml and 0.800 g/ml, and preferably a thickness between 0.200 mm and 20.00 mm.
  • the sleeve or roller 1 is produced as shown schematically in Figure 2.
  • the method for producing the sleeve or roller comprises adding an isocyanate present in a tank 20 to a polyol present in a tank 21. This addition can be in variable percentages, for example from 100 parts of polyol and 20 parts of isocyanate to 100:100 depending on the hardness to be obtained.
  • Dry, substantially moisture-free air i.e. having a lower relative humidity between 30% and 80%
  • the air quantity fed into the tank 21 is suitably metered by a metering pump and is for example one litre for each 10-15 kg of second component.
  • the isocyanate and polyol are mixed together in a mixing machine and from there the material obtained is distributed over a rotary roller or sleeve 23 so as to coat it and define the sleeve or roller 1 in crude form.
  • the coating obtained in this manner on the roller or sleeve 23 will contain perfectly regular air microbubbles dispersed uniformly within the entire layer of the roller or sleeve.
  • the coating on the roller, mandrel or sleeve 1 is surface-ground at 24, by which the air-containing cells are opened at the surface 5 to create, on the perfectly uniform and regular coating, microfissures offering the aforesaid advantages.
  • hollow bodies can be dispersed within the polymer material which become dispersed uniformly throughout the (overall) sleeve layer, said hollow bodies forming microcavities within the body 2 of the sleeve. These microcavities are then opened at the surface 6 of the layer 5 by subjecting the sleeve or roller to a suitable mechanical surface machining operation (grinding).
  • water droplets can be dispersed within the polymer material, these defining the aforesaid cavities when evaporated by heating the body 2.
  • At least layer 5 (or both layers 4 and 5 of polymeric material) are provided over a cylindrical body made of metal, glass-fiber, carbon fiber or any other rigid material but suitable for allowing a limited radial expansion of cylindrical body to be obtained when mounted on a mandrel of a printing machine.
  • layer 5 has an open-cell microcell structure in order to obtain the advantages above cited.
  • the sleeve is obtained by coating the cylindrical body, located on a rotating mandrel, with manufacturing steps which can be easily understood by the skilled man on the basis of the description of fig. 2. Hence, these steps are not described.

Landscapes

  • Rolls And Other Rotary Bodies (AREA)
  • Printing Plates And Materials Therefor (AREA)
EP05103430A 2005-04-27 2005-04-27 Cylindre ou manchon d'impression avec revêtement extérieur aux microcellules, ayant des cellules ouvertes à la surface et des cellules closes à l'interieur, et méthode pour sa production Withdrawn EP1717056A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP05103430A EP1717056A1 (fr) 2005-04-27 2005-04-27 Cylindre ou manchon d'impression avec revêtement extérieur aux microcellules, ayant des cellules ouvertes à la surface et des cellules closes à l'interieur, et méthode pour sa production

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP05103430A EP1717056A1 (fr) 2005-04-27 2005-04-27 Cylindre ou manchon d'impression avec revêtement extérieur aux microcellules, ayant des cellules ouvertes à la surface et des cellules closes à l'interieur, et méthode pour sa production

Publications (1)

Publication Number Publication Date
EP1717056A1 true EP1717056A1 (fr) 2006-11-02

Family

ID=35276531

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05103430A Withdrawn EP1717056A1 (fr) 2005-04-27 2005-04-27 Cylindre ou manchon d'impression avec revêtement extérieur aux microcellules, ayant des cellules ouvertes à la surface et des cellules closes à l'interieur, et méthode pour sa production

Country Status (1)

Country Link
EP (1) EP1717056A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2085246A1 (fr) * 2008-02-04 2009-08-05 ROSSINI S.p.A. Porte-blanchet et cylindre et procédé de fabrication correspondant

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0371386A2 (fr) * 1988-11-28 1990-06-06 Kabushiki Kaisha Tokyo Kikai Seisakusho Rouleau de mouillage et procédé pour sa fabrication et système de mouillage pour machine d'impression utilisant ledit rouleau
US5599266A (en) * 1994-06-21 1997-02-04 American Roller Company Foam reservoir fluid transfer roller
EP1164011A2 (fr) * 2000-06-16 2001-12-19 Erminio Rossini S.P.A. Manchon multicouche

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0371386A2 (fr) * 1988-11-28 1990-06-06 Kabushiki Kaisha Tokyo Kikai Seisakusho Rouleau de mouillage et procédé pour sa fabrication et système de mouillage pour machine d'impression utilisant ledit rouleau
US5429046A (en) * 1988-11-28 1995-07-04 Kabushikigaisha Tokyo Kikai Seisakusho Dampening roller and method for producing the same and dampening systems for a printing apparatus employing the dampening roller
US5599266A (en) * 1994-06-21 1997-02-04 American Roller Company Foam reservoir fluid transfer roller
EP1164011A2 (fr) * 2000-06-16 2001-12-19 Erminio Rossini S.P.A. Manchon multicouche

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2085246A1 (fr) * 2008-02-04 2009-08-05 ROSSINI S.p.A. Porte-blanchet et cylindre et procédé de fabrication correspondant
WO2009098644A2 (fr) 2008-02-04 2009-08-13 Rossini North America, Inc. Manchon/cylindre pontés de blanchet et leur méthode de fabrication pour presses offset rotatives
WO2009098644A3 (fr) * 2008-02-04 2009-12-03 Rossini North America, Inc. Manchon/cylindre pontés de blanchet et leur méthode de fabrication pour presses offset rotatives

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