EP3429853B1 - Schutzelement zum anwenden auf der basis eines zylinders einer hülse für den flexodruck und hülse mit diesem schutzelement - Google Patents

Schutzelement zum anwenden auf der basis eines zylinders einer hülse für den flexodruck und hülse mit diesem schutzelement Download PDF

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Publication number
EP3429853B1
EP3429853B1 EP17726117.9A EP17726117A EP3429853B1 EP 3429853 B1 EP3429853 B1 EP 3429853B1 EP 17726117 A EP17726117 A EP 17726117A EP 3429853 B1 EP3429853 B1 EP 3429853B1
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EP
European Patent Office
Prior art keywords
base
sleeve
piece
cylinder
flexographic printing
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.)
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Application number
EP17726117.9A
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English (en)
French (fr)
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EP3429853A1 (de
Inventor
Cristiano Bette'
Alessandro LUGLI
Ivano BAGGI
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.)
Trelleborg Coated Systems Italy SpA
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Trelleborg Coated Systems Italy SpA
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Publication of EP3429853A1 publication Critical patent/EP3429853A1/de
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F5/00—Rotary letterpress machines
    • B41F5/24—Rotary letterpress machines for flexographic printing
    • 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
    • B41F13/12—Registering devices
    • 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
    • B41F13/20—Supports for bearings or supports for forme, offset, or impression cylinders
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F27/00—Devices for attaching printing elements or formes to supports
    • B41F27/005—Attaching and registering printing formes to supports
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F27/00—Devices for attaching printing elements or formes to supports
    • B41F27/10—Devices for attaching printing elements or formes to supports for attaching non-deformable curved printing formes to forme cylinders
    • B41F27/105—Devices for attaching printing elements or formes to supports for attaching non-deformable curved printing formes to forme cylinders for attaching cylindrical printing formes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F27/00—Devices for attaching printing elements or formes to supports
    • B41F27/14—Devices for attaching printing elements or formes to supports for attaching printing formes to intermediate supports, e.g. adapter members
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41P—INDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
    • B41P2227/00—Mounting or handling printing plates; Forming printing surfaces in situ
    • B41P2227/20—Means enabling or facilitating exchange of tubular printing or impression members, e.g. printing sleeves, blankets
    • B41P2227/21—Means facilitating exchange of sleeves mounted on cylinders without removing the cylinder from the press

Definitions

  • the present invention relates to a lateral protective element of a flexographic sleeve of a machine per flexographic printing.
  • flexography is a direct rotary relief printing method and is alike to typography inasmuch as it uses resilient printing plates made of rubber or photopolymeric materials.
  • the printing plate is fixed on a sleeve which in turn is keyed on a rotating mandrel and is inked by means of a batching roller known as an "anilox" which is cell-structured, with the cells transferring the quick-drying printable liquid ink onto virtually any support, either absorbent or non-absorbent.
  • a batching roller known as an "anilox" which is cell-structured
  • such a sleeve is formed by a multilayer cylinder having a cylindrical axial cavity for insertion on the mandrel and two protective elements applied on the base of the cylinder.
  • One of the two protective elements is provided with a register slot engageable by an abutment provided on the mandrel for guaranteeing the correct angular position of the cylinder on the mandrel.
  • the register slot is realised on an L-shaped aluminium block which is fixed by a screw to a flat ring made of a different material acting as a protective element.
  • the internal edge of the base of the cylinder has a notch having a shape complementary to a wing of the L-shaped block in which the block is housed when the flat ring is glued to the base of the cylinder.
  • US 6691613 B1 relates to a printing cylinder that includes a support cylinder and a protective element according to the preamble of claim 1;
  • DE202008002329 U1 discloses an interchangeable pressure roller with an inner bearing sleeve and an outer sleeve, whilst WO 2013/164336 A2 relates to a bridge sleeve with diametrically expandable stabilizers.
  • the task proposed by the present invention is to make available an adapter sleeve which does not have the drawbacks of the prior art.
  • the object of the invention is to realise a construction for a sleeve per flexographic printing which enables a simplification of the assembly procedure and, in the end, saving production costs.
  • a lateral protective element that is applicable to a sleeve for flexographic printing according to claim 1.
  • said piece is made using a 3D printer.
  • Said register slot preferably extends in a secondary portion of said piece that surmounts said internal base of said ring.
  • said secondary portion of said piece is preferably greater in size than said ring.
  • a lateral wall of said secondary portion of said piece preferably extends on the extension of internal axial generatrixes of said ring.
  • Said register slot preferably extends until it opens at said external base of said ring.
  • Said register slot preferably has a cylindrical zone for engaging said abutment and a tapered zone for guided access of said abutment into said engagement zone.
  • Said internal base of said ring has weight-relief openings also functioning as reservoirs for an adhesive for joining said piece to said base of said cylinder.
  • Said piece preferably has graphic elements on said external base of said ring for customizing said sleeve.
  • Said secondary portion of said piece is housed in a complementarily-shaped notch present at an internal edge of said base of said cylinder.
  • Said piece is preferably joined with an adhesive to said cylinder.
  • said piece is suited to construction for additive manufacturing with various technologies such as FFF, DIW, SLA, DPL, 3DP, EBM, SLM, SHS, SLS, DMLS, LOM or EBF.
  • the sleeve for flexographic printing is denoted in its entirety by reference number 1.
  • the sleeve 1 comprises a cylinder 2 and lateral protective elements 3, 4 applied to the bases of the cylinder 2.
  • the cylinder 2 has an axial cylindrical cavity 5 adapted to receive a rotary support mandrel 6.
  • the cylinder 2 has at least three different layers, from inside to outside: a base layer, at least an intermediate layer for damping the vibrations and an external layer on which a printing plate (not shown) is applied, which comes into contact with a printing support (not shown).
  • One of the protective elements is provided with a register slot 7 that can be engaged by an abutment 8, for example a pin, provided on the mandrel 6.
  • the lateral protective element 3 and the register slot 7 are made as a single piece 9 with the same type of material.
  • the piece 9 is advantageously made of a material susceptible of being printed using a 3D printer.
  • the protective element 3 is a ring 11 that has an internal base 13 and an external base 14 in the form of a circular crown.
  • the protective element 3 is a flat ring 11 that has an internal flat base 13 adjacent in use to the base of the cylinder 2 and an external flat base 14 opposite in use to the base of the cylinder 2, the internal and external flat bases 13, 14 being in the form of circular crowns parallel to each other, the register slot 7 projecting orthogonally and externally to the flat ring 11 from the internal flat base 13.
  • the ring 11 is a primary portion of the piece 9 while the register slot 7 extends in a secondary portion 12 of the piece 9.
  • the secondary portion 12 of the piece 9 surmounts the internal base 13 of the ring 11.
  • the secondary portion 12 of the piece 9 is, in the direction of the axial generatrixes of the ring 11, greater in size than the ring 11.
  • the secondary portion 12 is delimited by four lateral walls which project perpendicularly from the internal base 13 of the ring 11, and a rear wall parallel to the internal base 13 of the ring 11.
  • the non-consecutive lateral walls of the secondary portion 12 of the piece 9 are parallel to one another, while the consecutive lateral walls of the secondary portion 12 of the piece 9 are perpendicular to one another.
  • the register slot 7 extends until it opens at the external base 14 of the ring 11.
  • the register slot 7 has a cylindrical zone 15 for engaging the abutment 8 and a tapered zone 16 for guided access of the abutment 8 in the engagement zone 15.
  • the internal base 13 of the ring 11 has weight-relief openings 17 also functioning as reservoirs for an adhesive for joining the piece 9 to the base of the cylinder 2.
  • the weight-relief openings 17 are honeycomb-shaped or shaped as concentric circles or any other suitable geometry.
  • the weight-relief openings 17 can be obtained directly with a 3D printer.
  • the piece 9 has the internal base 13 of the ring 11 that matches the base of the cylinder 2 and the secondary portion 12 housed in a complemplementarily-shaped notch 18 present at the internal perimeter edge of the base of the cylinder 2.
  • the piece 9 can have graphic elements 19 for customising the sleeve 1 at the external base 14 of the ring 11.
  • the customising graphic elements 19 can identify the sleeve 1 and the measurements thereof, and can be obtained directly using a 3D printer, for example by feeding it to carry out alternated layers with the same material but in different colours.
  • the 3D printer for making the piece 9 can use a filament of plastic material that is deposited layer by layer up to obtaining the object in three dimensions according to the FDM (fused deposition modelling) method.
  • the filament is constituted by polymers (there are various diameters, with the most easily sourced on the market being 3 mm and 1.7 mm) heated by a resistance (up to temperatures of 250°C).
  • the filament is passed through a nozzle, which, layer after layer, gives shape to the object.
  • the minimum printable layer with this method is about 100 microns (0.1 mm) (depending on the model).
  • the 3D printer uses another printing method known as SLS - selective laser sintering.
  • This technology is much more refined than FDM, as it enables selective fusion of a means in a granular bed.
  • the non-fused means is for supporting the projections and thin walls of the component which is produced, reducing the need for temporary auxiliary supports for the piece to be worked.
  • the level of precision of this printing technique is almost ten times greater than the FDM technique.
  • the materials used for making the piece 9 in the above-mentioned 3D printers have hardnesses comprised in the whole interval of scales Sha and ShD and are typically rigid materials such as for example thermosetting polyurethane resins, or epoxy resins, or thermoplastic resins, TPU, polyamide resins, nylon, HD or LD polyethylene or other polyolefins or mixtures thereof.
  • These materials can be added in order to obtain several chemical-physical properties, for example flame-resistance, surface electrical resistivity or anti-shock.
  • Metal additives can be included for increasing impact and wear resistance.
  • the sleeve for a flexographic printing machine as conceived herein is susceptible to numerous modifications and variants, all falling within the scope of the inventive concept; furthermore, all the details are replaceable by technically equivalent elements.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Printing Plates And Materials Therefor (AREA)
  • Manufacture Or Reproduction Of Printing Formes (AREA)

Claims (12)

  1. Seitenschutzelement (3), das auf einer Basis eines Zylinders (2) einer Hülse (1) für den Flexodruck anwendbar ist und das mit einem Registerschlitz (7) ausgestattet ist, in den ein an einem Dorn (6) vorgesehenes Widerlager (8) eingreifen kann, auf dem die Hülse (1) montiert ist, wobei das Seitenschutzelement (3) und der Registerschlitz (7) aus einem Stück (9) mit der gleichen Art von Material hergestellt sind, wobei das Seitenschutzelement (3) ein flacher Ring (11) ist, der einen Primärabschnitt des Stücks (9) bildet und eine innere flache Basis (13) neben der Basis des Zylinders (2) und eine äußere flache Basis (14) gegenständig zur Basis des Zylinders (2) aufweist, wobei die innere und die äußere flache Basis (13, 14) die Form von kreisförmigen Kronen aufweisen, die parallel zueinander sind, dadurch gekennzeichnet, dass der Registerschlitz (7) orthogonal und außerhalb des flachen Rings (11) von der internen flachen Basis (13) absteht, wobei sich der Registerschlitz (7) in einem Sekundärabschnitt (12) des Stücks (9) erstreckt, das in einem komplementär geformte Kerbe (18), die an einer inneren Umfangskante der Basis des Zylinders (2) vorhanden ist, untergebracht ist, wobei die innere flache Basis (13) des flachen Rings (11) mit der Basis des Zylinders (2) übereinstimmt.
  2. Seitenschutzelement (3) nach dem vorhergehenden Anspruch, dadurch gekennzeichnet, dass die innere Basis (13) des flachen Rings (11) Gewichtsentlastungsöffnungen (17) aufweist, die auch als Reservoirs für einen Klebstoff zum Zusammenfügen des Stücks (9) mit der Basis des Zylinders (2) dient.
  3. Hülse (1) für den Flexodruck umfassend einen Zylinder (2) und ein Seitenschutzelement (3) nach Anspruch 1, die auf einer Basis des Zylinders (2) angebracht ist.
  4. Hülse (1) für den Flexodruck nach dem vorhergehenden Anspruch, dadurch gekennzeichnet, dass das Stück (9) aus einem Material hergestellt ist, das unter Verwendung eines 3D-Druckers bedruckt werden kann.
  5. Hülse (1) für den Flexodruck nach dem vorhergehenden Anspruch, dadurch gekennzeichnet, dass der Sekundärabschnitt (12) des Stücks (9) die innere flache Basis (13) des flachen Rings (11) überragt.
  6. Hülse (1) für den Flexodruck nach dem vorhergehenden Anspruch, dadurch gekennzeichnet, dass der Sekundärabschnitt (12) des Stücks (9) in der Richtung der axialen Mantellinien des flachen Rings (11) größer ist als der flache Ring (11).
  7. Hülse (1) für den Flexodruck nach dem vorhergehenden Anspruch, dadurch gekennzeichnet, dass sich eine Seitenwand des Sekundärabschnitts (12) des Stücks (9) auf der Erstreckung der inneren axialen Mantellinien des flachen Rings (11) erstreckt.
  8. Hülse (1) für den Flexodruck nach einem der vorhergehenden Ansprüche 3-7, dadurch gekennzeichnet, dass der Registerschlitz (7) eine zylindrische Zone (15) zum Eingreifen in das Widerlager (8) und eine spitz zulaufende Zone (16) für den geführten Zugang des Widerlagers (8) in die Eingriffszone (15) aufweist.
  9. Hülse (1) für den Flexodruck nach einem der vorhergehenden Ansprüche 3-8, dadurch gekennzeichnet, dass die innere flache Basis (13) des flachen Rings (11) Gewichtsentlastungsöffnungen (17) aufweist, die auch als Reservoirs für einen Klebstoff zum Zusammenfügen des Stücks (9) mit der Basis des Zylinders (2) dient.
  10. Hülse (1) für den Flexodruck nach einem der vorhergehenden Ansprüche 3-9, dadurch gekennzeichnet, dass das Stück (9) grafische Elemente (19) auf der äußeren flachen Basis (1) zum Personalisieren der Hülse (1) aufweist.
  11. Hülse (1) für den Flexodruck nach einem der vorhergehenden Ansprüche 3-10, dadurch gekennzeichnet, dass das Stück (9) mit einem Klebstoff an der Basis des Zylinders (2) zusammengefügt wird.
  12. Flexodruckmaschine, dadurch gekennzeichnet, dass sie eine Hülse (1) nach einem der vorhergehenden Ansprüche 3-11 aufweist.
EP17726117.9A 2016-05-31 2017-05-24 Schutzelement zum anwenden auf der basis eines zylinders einer hülse für den flexodruck und hülse mit diesem schutzelement Active EP3429853B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITUA2016A003973A ITUA20163973A1 (it) 2016-05-31 2016-05-31 Elemento protettivo applicabile su una base di un cilindro di una sleeve per stampa flessografica, e sleeve incorporante un tale elemento protettivo
PCT/EP2017/062558 WO2017207391A1 (en) 2016-05-31 2017-05-24 A protective element that can be applied on a base of a cylinder of a sleeve for flexographic printing, and a sleeve incorporating said protective element

Publications (2)

Publication Number Publication Date
EP3429853A1 EP3429853A1 (de) 2019-01-23
EP3429853B1 true EP3429853B1 (de) 2019-12-25

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EP17726117.9A Active EP3429853B1 (de) 2016-05-31 2017-05-24 Schutzelement zum anwenden auf der basis eines zylinders einer hülse für den flexodruck und hülse mit diesem schutzelement

Country Status (3)

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EP (1) EP3429853B1 (de)
IT (1) ITUA20163973A1 (de)
WO (1) WO2017207391A1 (de)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2793725B1 (fr) * 1999-05-20 2001-07-27 Polyfibron Technologies Sa Cylindre d'impression comprenant des moyens d'indexage pour le montage d'un manchon d'impression sur le cylindre support
DE202008002329U1 (de) * 2008-02-20 2009-06-25 Spilker Gmbh Auswechselbare Druckwalze
US9120302B2 (en) * 2012-04-30 2015-09-01 Rossini S.P.A. Bridge sleeves with diametrically expandable stabilizers

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
WO2017207391A1 (en) 2017-12-07
EP3429853A1 (de) 2019-01-23
ITUA20163973A1 (it) 2017-12-01

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