EP3411235A1 - A method for realising on a sleeve for flexographic printing a guide for laying and cutting a cliché and/or a bi-adhesive layer interposed between the sleeve and the cliché - Google Patents
A method for realising on a sleeve for flexographic printing a guide for laying and cutting a cliché and/or a bi-adhesive layer interposed between the sleeve and the clichéInfo
- Publication number
- EP3411235A1 EP3411235A1 EP17702857.8A EP17702857A EP3411235A1 EP 3411235 A1 EP3411235 A1 EP 3411235A1 EP 17702857 A EP17702857 A EP 17702857A EP 3411235 A1 EP3411235 A1 EP 3411235A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- groove
- sleeve
- profiled element
- adhesive layer
- glue
- 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- Withdrawn
Links
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
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- 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
- B41F27/12—Devices for attaching printing elements or formes to supports for attaching flexible printing formes
- B41F27/1262—Devices for attaching printing elements or formes to supports for attaching flexible printing formes without tensioning means
- B41F27/1275—Devices for attaching printing elements or formes to supports for attaching flexible printing formes without tensioning means by means of adhesives, staples
-
- 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
- B41F—PRINTING MACHINES OR PRESSES
- B41F30/00—Devices for attaching coverings or make-ready devices; Guiding devices for coverings
- B41F30/04—Devices for attaching coverings or make-ready devices; Guiding devices for coverings attaching to transfer 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
- B41N6/00—Mounting boards; Sleeves Make-ready devices, e.g. underlays, overlays; Attaching by chemical means, e.g. vulcanising
- B41N6/02—Chemical means for fastening printing formes on mounting boards
Definitions
- the present invention relates to a method for realising on a sleeve for flexographic printing a guide for laying and cutting a cliche and/or a bi-adhesive layer interposed between the sleeve and the cliche.
- sleeves for flexographic printing typically have a layered structure in composite material that gives appropriate characteristics of lightness but creates problems when laying the cliches on the external surface of the sleeve.
- the sleeve in fact, undergoes a finishing process that is necessary to give it the desired external diameter size with precision.
- the cliches must be then positioned accurately around the sleeve.
- the cliche features a set of interlocking joints that can be engaged in other such joints of conjugated shape present on the surface of the sleeve and is applied to the external surface of the sleeve using a bi-adhesive layer.
- the excess bi-adhesive layer around the sleeve is trimmed to match the sleeve exactly.
- Trimming is performed by the operator with a cutter which, however, can cause carvings also to the external coating layer of the sleeve. This results in the need to repair the sleeve and consequently a delay in making the sleeve available for use.
- EP0989934 proposes the use of a guide integrated in the external coating layer of the sleeve for laying and cutting the cliche and the bi-adhesive that enjoins the cliche to the sleeve.
- the guide is realised as follows: first, a groove is made along the external coating layer of the sleeve, then the groove is completely filled with a reinforced epoxy glue with high hardness, then the epoxy glue is polymerised, and finally material is removed from the polymerised epoxy glue along a longitudinal track that defines the guide.
- This method for realising the guide as evident requires two distinct processes of material removal, leads to a waste of the removed material in the second process of material removal, and requires significant expenditure of energy and time for the polymerisation of the epoxy glue, which must completely fill the groove along the external coating layer of the sleeve.
- the technical task of the present invention is to provide a method for realising on a sleeve for flexographic printing a guide for laying and cutting a cliche and/or a bi-adhesive layer interposed between the sleeve and the cliche and a sleeve for a flexographic printing which allow to obviate the technical drawbacks complained by the prior art.
- an object of the invention is to provide a method for realising this guide in a convenient, simple, precise and safe way for the sleeve and the cliche itself.
- Another object of the invention is to provide a method that is much more productive than those used to date for realising on a sleeve for flexographic printing a guide for laying and cutting a cliche and/or a bi-adhesive layer interposed between the sleeve and the cliche.
- this embodiment of the guide requires only one material removal process, does not involve significant material waste and allows for a significant saving of energy and time since, even if a glue is used to fasten the profiled element, it must polymerise a limited amount of glue.
- the profiled element has a smaller height than the depth of the groove and is positioned flush in the groove.
- the glue when used, is applied in the form of a uniform or discontinuous layer on the whole surface of the groove.
- the profiled element is inserted for the whole length and width thereof in contact with the glue or the adhesive layer.
- the profiled element has a U-shaped or
- V-shaped configuration in cross section is V-shaped.
- the shape of the groove is congruent with the external shape of the profiled element.
- the profiled element is obtained by moulding. In an embodiment of the invention, the profiled element is obtained by extrusion. In an embodiment of the invention, the profiled element is obtained by 3D moulding.
- the profiled element is obtained by pultrusion.
- the profiled element is made of aluminium.
- the profiled element is made of reinforced plastic.
- the present invention also reveals a sleeve for flexographic printing exhibiting a guide so produced and a flexographic printing machine comprising a printing cylinder coated with such a flexographic printing sleeve. Additional characteristics and advantages of the invention will become more apparent from the description of a preferred but not exclusive embodiment of the method for realising a guide on a sleeve for flexographic printing, according to the invention, shown for illustrative and not limiting purposes in the attached drawings, in which:
- figures l a, l b, lc and I d show the timeline of the processes necessary to realise the guide on the external coating layer of the sleeve;
- figure 2 shows a perspective view of the sleeve
- figure 3 shows a detailed view of the cross-section of the profiled element
- figure 4 shows a variant of the sleeve with a dovetail interlocking joint of the longitudinal profiled element in the groove.
- a sleeve for flexographic printing is shown, indicated altogether with reference number 1.
- Sleeve 1 has an inner side that can be applied on a printing cylinder (not shown) and an external side on which a cliche 10 can be applied using a bi-adhesive layer (not shown).
- Sleeve 1 has in succession from the inner to the external side, an inner layer 3 in composite material made from fibres embedded in a resin matrix, a thickness compensation layer 4 made of cellular material, a high rigidity layer 5 and an external coating layer 6 made of resin or otherwise devoid of fibres to be suitable for a surface machining to adjust the thickness.
- Layer 6 can be made of epoxy resin or even polyurethane resin for example, with a hardness in the order of Shore D.
- the method for realising on sleeve 1 a guide 2 for laying and cutting the cliche 10 and/or the bi-adhesive layer interposed between the sleeve 1 and the cliche 10 is characterized by the following steps.
- a longitudinal profiled element 7 longitudinally provided with a surface cavity 8 acting as a guide 2 for laying and cutting the cliche 10 and/or the bi-adhesive layer is realised.
- a groove 9 having a smaller depth than the thickness of the external coating layer 6 and configured for housing the profiled element 7 inside thereof is formed on the external coating layer 6.
- the profiled element 7 is supplied with a smaller height than the thickness of the coating layer 6.
- the profiled element 7 can be obtained by hot or cold moulding or by extrusion, and is made of aluminium or reinforced plastic.
- the longitudinal profiled element 7 consists of a bar with a straight longitudinal axis.
- the longitudinal profiled element 7 consists of a bar with a curved longitudinal axis, curved according to a curvature radius congruent to that of groove 9.
- the profiled element 7 has more precisely a height and width smaller than the depth and width of groove 9, respectively.
- the profiled element 7 has a length less than or equal to the length of groove 9.
- the profiled element 7 has constant shape and size along its longitudinal axis.
- the profiled element 7 has, in particular, a generically U-shaped cross section, but could also have a generically V-shaped cross section.
- the concave surface T of the profiled element 7 delimits the cavity 8, while the convex surface 7" of the profiled element 7, when this is housed in the groove 9, faces onto the surface of groove 9.
- Groove 9 in turn has constant shape and size along its longitudinal axis.
- groove 9 is congruent with the external shape of the profiled element
- thermosetting glue 1 1.
- the glue 1 1 is applied preferably in the form of a uniform layer on the whole surface of groove 9.
- glue 1 1 occupies a much lower volume than the overall volume delimited by groove 9, as it is applied in the form of a layer having a uniform thickness far lower than the width and depth of groove 9.
- the profiled element 7 is positioned across its height and width in contact with the glue 11.
- the profiled element 7 is placed with its longitudinal axis parallel to the longitudinal axis of groove 9 and is flush with groove 9, namely the external end of the profiled element 7 is placed on the external cylindrical surface extension of the external coating layer 6.
- the profiled element 7 is fixed in this position, supplying to the glue 11 the thermal energy necessary for its polymerisation.
- thermosetting glue such as a glue polymerisable at room temperature or polymerisable with moisture or UV light.
- a layer of adhesive can also be used, such as a phenolic adhesive.
- the glue or adhesive can be applied in the form of a uniform or even discontinuous layer.
- the profiled element 7 and groove 9 are shaped for coupling with a dovetail interlocking joint.
- the bottom of groove 9 can also include a slight concavity to encourage the accumulation of glue 1 1.
- a tapering of groove 9 from the bottom towards the top configures groove 9 for mechanical interlocking with the profiled element 7, if the latter presents a shape conjugated to it, otherwise it creates glue reserves useful to strengthen the connection of the profiled element 7 in groove 9.
- the profiled element 7 is slid in the longitudinal direction of sleeve 1 in groove 9, where the glue has been applied previously, if, instead, there is no interlocking conformation between the profiled element 7 and groove 9, the profiled element 7 can be inserted into groove 9 in the same way or even in the diametrical direction of sleeve 1.
- the introduction of the profiled element in the diametrical direction of sleeve 1 allows a more uniform wetting of the profiled element 7 with the glue, while the introduction in the longitudinal direction of the sleeve allows a highly accurate positioning of the profiled element 7 when an interlocking conformation is envisioned between the profiled element 7 and groove 9.
- the glue that is used in a preferred embodiment in which the external layer 6 of sleeve 1 is in epoxy resin and the profiled element 7 is made of aluminium or an alloy thereof, is a structural, epoxy-based adhesive with amine accelerators, for example but not necessarily DP410TM manufactured by 3MTM.
- the glue has a dual function, namely a filling function of the gap between the profiled element 7 and groove 9 and a function of adhesion to the interface with the profiled element 7 and the wall of groove 9.
- the materials used and the size can be any, depending on the needs and the state of the art.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Printing Plates And Materials Therefor (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITUB2016A000533A ITUB20160533A1 (en) | 2016-02-02 | 2016-02-02 | METHOD FOR MAKING A GUIDE FOR FLEXOGRAPHIC PRINTING ON A SLEEVE FOR LAYING AND CUTTING A CLICHÉ AND / OR A BIADESIVO LAYER INTERACTED BETWEEN THE SLEEVE AND THE CLICHÉ |
PCT/EP2017/052109 WO2017134082A1 (en) | 2016-02-02 | 2017-02-01 | A method for realising on a sleeve for flexographic printing a guide for laying and cutting a cliché and/or a bi-adhesive layer interposed between the sleeve and the cliché |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3411235A1 true EP3411235A1 (en) | 2018-12-12 |
Family
ID=55861041
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP17702857.8A Withdrawn EP3411235A1 (en) | 2016-02-02 | 2017-02-01 | A method for realising on a sleeve for flexographic printing a guide for laying and cutting a cliché and/or a bi-adhesive layer interposed between the sleeve and the cliché |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP3411235A1 (en) |
IT (1) | ITUB20160533A1 (en) |
WO (1) | WO2017134082A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
MX2020010453A (en) * | 2018-04-05 | 2020-10-20 | Essity Hygiene & Health Ab | Flexographic printing device and a method of simultaneously printing at least two material webs having different thicknesses. |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
IT1222651B (en) * | 1987-09-11 | 1990-09-05 | Cerutti Spa Off Mec | PRINTING CYLINDER FOR ROTARY PRINTING MACHINES |
FR2764842B1 (en) * | 1997-06-24 | 1999-09-24 | Jean Francille | INTEGRATED GUIDANCE DEVICE FOR PRINT SLEEVE OR CYLINDER AND SLEEVE OR CYLINDER EQUIPPED WITH SUCH DEVICE |
DE19929630A1 (en) * | 1999-06-29 | 2001-01-04 | Roosen Reiner | Foil material applicator for printing cylinder, with strip separating element which has two parallel guides for cutting element |
DE102004013552A1 (en) * | 2004-03-19 | 2005-10-06 | Goss International Montataire S.A. | Lifting sleeve for a cylinder in a printing machine |
FR2889674B1 (en) * | 2005-08-09 | 2007-09-14 | Goss Int Montataire Sa | ADAPTATION SLEEVE, ASSEMBLY AND METHOD OF MOUNTING CORRESPONDING |
-
2016
- 2016-02-02 IT ITUB2016A000533A patent/ITUB20160533A1/en unknown
-
2017
- 2017-02-01 WO PCT/EP2017/052109 patent/WO2017134082A1/en active Application Filing
- 2017-02-01 EP EP17702857.8A patent/EP3411235A1/en not_active Withdrawn
Also Published As
Publication number | Publication date |
---|---|
ITUB20160533A1 (en) | 2017-08-02 |
WO2017134082A1 (en) | 2017-08-10 |
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RIC1 | Information provided on ipc code assigned before grant |
Ipc: B41F 30/04 20060101ALI20190510BHEP Ipc: B41F 5/24 20060101AFI20190510BHEP Ipc: B41F 27/14 20060101ALI20190510BHEP Ipc: B41N 6/02 20060101ALI20190510BHEP Ipc: B41N 6/00 20060101ALI20190510BHEP Ipc: B41F 27/12 20060101ALI20190510BHEP |
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