EP3429853B1 - Élément de protection qui peut être appliqué sur la base d'un cylindre d'un manchon pour impression flexographique et manchon incorporant ledit élément de protection - Google Patents

Élément de protection qui peut être appliqué sur la base d'un cylindre d'un manchon pour impression flexographique et manchon incorporant ledit élément de protection 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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German (de)
English (en)
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EP3429853A1 (fr
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
Original Assignee
Trelleborg Coated Systems Italy SpA
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Publication of EP3429853A1 publication Critical patent/EP3429853A1/fr
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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. Élément de protection (3) latéral qui peut être appliqué sur une base d'un cylindre (2) d'un manchon (l) pour impression flexographique et étant équipé d'une rainure de registre (7) qui peut être mise en prise par une butée (8) prévue sur un mandrin (6) sur lequel est monté ledit manchon (1), ledit élément de protection (3) latéral et ladite rainure de registre (7) étant réalisés en une seule pièce (9) avec le même type de matériau, ledit élément de protection (3) latéral étant une bague plate (11) formant une partie principale de ladite pièce (9) et comportant une base plate (13) intérieure adjacente à ladite base dudit cylindre (2) et une base plate (14) extérieure opposée à ladite base dudit cylindre (2), lesdites bases plates intérieure et extérieure (13, 14) se présentant sous la forme de couronnes circulaires parallèles l'une à l'autre, caractérisé en ce que ladite rainure de registre (7) dépasse orthogonalement à, et extérieurement de ladite bague plate (11) à partir de ladite base plate (13) intérieure, ladite rainure de registre (7) se prolongeant dans une partie secondaire (12) de ladite pièce (9) logée dans une encoche à forme complémentaire (18) présente en correspondance d'un bord périphérique intérieur de ladite base dudit cylindre (2), ladite base plate (13) intérieure de ladite bague plate (11) correspondant à ladite base dudit cylindre (2).
  2. Élément de protection (3) latéral selon la revendication précédente, caractérisé en ce que ladite base intérieure (13) de ladite bague plate (11) comporte des ouvertures (17) d'allègement de poids fonctionnant aussi comme des réservoirs pour un adhésif servant à joindre ladite pièce (9) à ladite base dudit cylindre (2).
  3. Manchon (1) pour impression flexographique comprenant un cylindre (2) et un élément de protection (3) latéral selon la revendication 1, appliqués sur une base dudit cylindre (2).
  4. Manchon (1) pour impression flexographique selon la revendication précédente, caractérisé en ce que ladite pièce (9) est constituée d'un matériau susceptible d'être imprimé en utilisant une imprimante 3D.
  5. Manchon (1) pour impression flexographique selon la revendication précédente, caractérisé en ce que ladite partie secondaire (12) de ladite pièce (9) surmonte ladite base plate (13) intérieure de ladite bague plate (11).
  6. Manchon (1) pour impression flexographique selon la revendication précédente, caractérisé en ce que dans la direction des génératrices axiales de ladite bague plate (11), ladite partie secondaire (12) de ladite pièce (9) possède une dimension supérieure à ladite bague plate (11).
  7. Manchon (1) pour impression flexographique selon la revendication précédente, caractérisé en ce qu'une cloison latérale de ladite partie secondaire (12) de ladite pièce (9) se prolonge sur l'extension des génératrices axiales intérieures de ladite bague plate (11) .
  8. Manchon (1) pour impression flexographique selon l'une quelconque des revendications précédentes 3-7, caractérisé en ce que ladite rainure de registre (7) comporte une zone cylindrique (15) pour se mettre en prise avec ladite butée (8) et une zone conique (16) pour un accès guidé de ladite butée (8) dans ladite zone de mise en prise (15).
  9. Manchon (1) pour impression flexographique selon l'une quelconque des revendications précédentes 3-8, caractérisé en ce que ladite base plate (13) intérieure de ladite bague plate (11) comporte des ouvertures (17) d'allègement de poids fonctionnant aussi comme des réservoirs pour un adhésif servant à joindre ladite pièce (9) à la base dudit cylindre (2).
  10. Manchon (1) pour impression flexographique selon l'une quelconque des revendications précédentes 3-9, caractérisé en ce que ladite pièce (9) comporte des éléments graphiques (19) sur ladite base plate (1) extérieure pour personnaliser ledit manchon (1).
  11. Manchon (1) pour impression flexographique selon l'une quelconque des revendications précédentes 3-10, caractérisé en ce que ladite pièce (9) est jointe à ladite base dudit cylindre (2) par un adhésif.
  12. Machine pour impression flexographique caractérisée en ce qu'elle comprend un manchon (1) selon l'une quelconque des revendications précédentes 3-11.
EP17726117.9A 2016-05-31 2017-05-24 Élément de protection qui peut être appliqué sur la base d'un cylindre d'un manchon pour impression flexographique et manchon incorporant ledit élément de protection Active EP3429853B1 (fr)

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 (fr) 2016-05-31 2017-05-24 Élément de protection qui peut être appliqué sur une base d'un cylindre d'un manchon pour impression flexographique, et manchon incorporant ledit élément de protection

Publications (2)

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

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EP17726117.9A Active EP3429853B1 (fr) 2016-05-31 2017-05-24 Élément de protection qui peut être appliqué sur la base d'un cylindre d'un manchon pour impression flexographique et manchon incorporant ledit élément de protection

Country Status (3)

Country Link
EP (1) EP3429853B1 (fr)
IT (1) ITUA20163973A1 (fr)
WO (1) WO2017207391A1 (fr)

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 (fr) 2017-12-07
EP3429853A1 (fr) 2019-01-23
ITUA20163973A1 (it) 2017-12-01

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