EP3543012A2 - Procédé de réalisation d'une couverture ou d'une dalle de vernissage de surimpression - Google Patents

Procédé de réalisation d'une couverture ou d'une dalle de vernissage de surimpression Download PDF

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Publication number
EP3543012A2
EP3543012A2 EP19163104.3A EP19163104A EP3543012A2 EP 3543012 A2 EP3543012 A2 EP 3543012A2 EP 19163104 A EP19163104 A EP 19163104A EP 3543012 A2 EP3543012 A2 EP 3543012A2
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EP
European Patent Office
Prior art keywords
varnishing
layer
slab
blanket
realising
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.)
Granted
Application number
EP19163104.3A
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German (de)
English (en)
Other versions
EP3543012A3 (fr
EP3543012B1 (fr
Inventor
Roberto Levi Acobas
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Individual
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Individual
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Priority to PL19163104T priority Critical patent/PL3543012T3/pl
Publication of EP3543012A2 publication Critical patent/EP3543012A2/fr
Publication of EP3543012A3 publication Critical patent/EP3543012A3/fr
Application granted granted Critical
Publication of EP3543012B1 publication Critical patent/EP3543012B1/fr
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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
    • B41C1/003—Forme preparation the relief or intaglio pattern being obtained by imagewise deposition of a liquid, e.g. by an ink jet

Definitions

  • the invention relates to a process for realising a blanket or slab for overprint varnishing.
  • varnishes are typically UV cross-linking or water-based acrylic; they are usually applied using one or more special printing units (known as “varnishing units") positioned as final elements of the machine and followed, if necessary, by ovens or lamps for the drying or cross-linking of the varnishes themselves.
  • varnishing units special printing units
  • the transfer of the varnish onto the support takes place using a rubber-coated fabric (blanket) or a varnishing slab that has the function of collecting the varnish and transferring it to the support for printing. If it is necessary to preserve some zones of this application, in common practice the upper layer of the blanket or of the slab is cut and removed in the aforementioned zones so that the difference in thickness allows the transfer of the varnish to be prevented. These areas of lack of material with a lower thickness notched in the blankets or in the slab are known as "reserves".
  • the reserves are normally performed by notching the varnishing layer which is then manually removed.
  • the notching itself can be performed with a manual operation but it more commonly takes place through the aid of a cutting plotter.
  • these slabs are generally constructed using expensive photopolymers and normally undergo a complex preparation in three steps which, although automated, requires dedicated and expensive machinery.
  • a special protective film is removed by laser ablation which leaves the photopolymer uncovered in the zones of the graphics
  • a lamp generally UV
  • development in which the non cross-linked photopolymer is eliminated by washing with water or with solvent.
  • the task of the present invention is therefore to eliminate the above-mentioned drawbacks of the prior art.
  • an object of the invention is that of allowing the manufacturing of varnishing slabs made with materials and surfaces suitable for printing in highly customisable shapes and adaptable to the needs of the customer and the type of varnishing unit thanks to additive manufacturing techniques, in particular 3D printing.
  • Another object of the invention is that of making it no longer necessary to use an adhesive interposed between the varnishing layer and the support layer, or alternatively allowing the use of an adhesive with less restrictive adhesive properties: at the moment, the adhesives used must have adhesion properties comprised in a rather restricted adhesion range, to guarantee good manual peeling properties but prevent undesired delamination in the machine, and which represents an important risk factor and additional costs.
  • Another object of the invention is that of simplifying the production process both in terms of time and in economic terms and of minimising material waste, both in economic and ecological terms.
  • a process for realising a blanket or slab for overprint varnishing at least comprising a support layer and a varnishing layer characterised in that a digital model of the varnishing layer is created having areas of lack of material that modify in a localised way the thickness of said varnishing layer, and a non cross-linked elastomeric thermoplastic polymer material is applied onto said support layer with an additive technology that physically reproduces the digital model of said varnishing layer.
  • thermoplastic polymer is a thermoplastic polyurethane.
  • the elastomeric thermoplastic polymer is mixed with a silicone polymer.
  • the process for realising a blanket or slab for overprint varnishing forms a raised surface through the deposition of an additional quantity of said thermoplastic polymer in an area surrounding said lacking areas.
  • the process envisages the deposit of a thin layer of said thermoplastic polymer on the bottom of said lacking areas.
  • the support layer is made of PET or PVC or PC or PMMA or TPU or metal.
  • the process joins said support layer and said varnishing later through a surface treatment of said support layer through peeling with trichloroacetic acid.
  • the process joins said support layer and said varnishing layer through the use of a water- or solvent-based urethane or acrylic adhesive.
  • the process comprises a step of finishing the exposed surface of said varnishing layer adapted to give said varnishing layer opaque and/or slippery and/or rough properties.
  • the finishing can be performed using a paper or a PET release film having the desired roughness properties, possibly applied hot and/or under pressure with a press or calender, installed on the line or off line, on the varnishing layer.
  • the finishing layer can be performed using a notched cylinder or a notched press.
  • the varnishing blanket or slab further comprises a further layer that can be compressed to a side of said support layer.
  • the further compressible layer is made of a thermoplastic polyurethane-based material and expanding additives.
  • the varnishing layer is free from additives, plasticisers and molecular cross-linking agents.
  • the process according to the patent does not use photopolymeric slabs but economically more advantageous slabs made with thermoplastic polymers, preferably elastomers, preferably made of polyurethane.
  • the resolution of the deposition of material through 3D printing techniques by the extrusion of elastomeric thermoplastic polymers is comprised between 20 and 100 ⁇ m. Unlike flexographic printing where, to guarantee the printing quality, it is appropriate for the resolution to be ⁇ 10 ⁇ m, in the application as varnishing layer, it is only required that the edges of the varnishing layer be clear and precise; furthermore, the very low shrinkage percentages (0.8 - 1.8%) that characterise the thermoplastic polyurethane allow the deposition of shapes with high accuracy, even in the absence of cross-linking or reinforcing agents.
  • the present invention comprises a final surface finishing step for the hot application under pressure of a film of paper or PET or another plastic material with release properties for the transfer of a fine weft of known roughness (typically 0.4 ⁇ m ⁇ R a ⁇ 1.2 ⁇ m).
  • the finishing is also possible thanks to the thermoplastic properties of non cross-linked polyurethane, and confers the desired properties of opacity, slipperiness, prevention of the accumulation of varnishes or inks, surface tension.
  • fig. 1 is a lateral raised partial sectional view of a blanket or slab for varnishing according to a first embodiment of the present invention
  • FIG 2 is a lateral raised view in partial section of a blanket or slab for varnishing in compliance with a second embodiment of the present invention, in which a compressible layer is positioned between the support layer and the varnishing layer;
  • figure 3 is a lateral raised view in partial section of a blanket or slab for varnishing in compliance with a third embodiment of the present invention, in which the compressible layer is applied to the support layer opposite the one in which the varnishing layer is applied;
  • figure 4 shows a plan view of a varnishing layer illustrating the various areas of lack of material;
  • figure 5 shows a lateral raised sectional view of a detail of the blanket at the lacking areas.
  • the blanket or slab for overprint varnishing according to the present invention is generically indicated by 1.
  • the blanket or slab for overprint varnishing 1 has a thickness comprised between 0.8 mm and 4 mm and comprises a support layer 2 and a varnishing layer 3 in non cross-linked thermoplastic polymer for the transfer of an overprint varnish to a printed support.
  • the varnishing layer 3 has areas with a lack 10 of material not subject to the transfer of varnish. Such lacking areas 10 are realised through the physical reproduction of a digital model of the varnishing layer 3.
  • the realisation of the blanket or slab for overprint varnishing 1 takes place through the application on the support layer 2 of the non cross-linked elastomeric thermoplastic polymer material with an additive technology that physically reproduces the digital model of said varnishing layer 3.
  • Figure 4 shows by way of example the outer face of a varnishing layer 3 that shows some lacking areas 10 of the material not subject to the transfer of the varnish that form a graphic.
  • the support layer 2 has a thickness comprised between 0.05mm - 0.40mm and is made of polymeric material (e.g. PET, PVC, TPU, PC, PMMA) or metal (e.g. aluminium) or natural fibre or synthetic fibre.
  • thermoplastic polymer material of the varnishing layer 3 comprises a thermoplastic polyurethane (TPU) adapted for the application of overprint varnish.
  • TPU thermoplastic polyurethane
  • thermoplastic polymer can also be mixed with a silicone polymer.
  • the varnishing layer 3 can comprise a polyether based thermoplastic polyurethane.
  • the varnishing layer 3 preferably has a thickness comprised between 0.070 mm and 1.95mm.
  • the process for the realisation of the blanket or slab for overprint varnishing 1 envisages joining the support layer 2 and the varnishing layer 3 through the use of an irreversible adhesive layer 4 made of water- or solvent-based urethane or acrylic material.
  • the adhesion force between the support 2 and the upper layers is greater than 7 N/cm, preferably greater than 10 N/cm;
  • an adhesive 4 preferably acrylic or urethane, with a thickness comprised between 5 ⁇ m and 50 ⁇ m, preferably between 15 ⁇ m and 30 ⁇ m.
  • the join between said support layer 2 and said varnishing layer 3 is performed through a surface treatment of the support layer by means of peeling with trichloroacetic acid (TCA).
  • the blanket or slab for overprint varnishing 1 may further comprise a further compressible layer 5 applicable to a side of the support layer 2.
  • the compressible layer 5 can be interposed between the varnishing layer 3 and the support layer 2 or alternatively the compressible layer 5 can be applied to the opposite support layer 2 to the one on which the varnishing layer 3 is applied.
  • the compressible layer 5 is made of a TPU-based (thermoplastic polyurethane) material and expanding additives.
  • Both the varnishing layer 3 and any compressible layer 5 may contain organic or inorganic fillers for reaching the optimal rheological properties for the 3D printing step.
  • the suitable adhesion of the compressible layer 5 to the support layer 2 can be guaranteed through the use of an adhesive 4 or through a surface treatment as described above.
  • the reproduction precision of the area surrounding the lacking areas 10 is guaranteed by the formation of a raised surface that forms a collar around the perimeter of the lacking area 10 through the deposition of an additional quantity of the thermoplastic polymer.
  • a thin layer 12 of thermoplastic polymer, having a thickness of 0.05/0.20 mm, on the bottom of the lacking areas 10 further guarantees a high resistance to the delamination caused by the varnishing products used and their washing solvents.
  • the invention focuses on the process for realising the blanket or slab for overprint varnishing 1. Below are some practical example embodiments of the varnishing blanket or slab.
  • the varnishing layer 3 is a film of TPU ESTANETM 58887 deposited through fused deposition modeling (FDM) on the support layer made of PET with TCA treatment with a thickness of 350 ⁇ m and then with a surface finish through coupling with a film of PET Transfer release 100 ⁇ m thick in a press heated to 150 °C with a pressure of 4 bar, possibly subsequently removed or maintained as the protective layer.
  • the compressible layer 5 is an expanded film of TPU ESTANETM 54620 having a thickness of 0.500 mm and is obtained through the expansion of the film during the film extrusion process by adding the TPU with 2% Advancell EHM401 and coupled directly during the process to a support layer 2 made of PET having a thickness of 250 ⁇ m (Mylar ADS) treated with TCA to increase adhesion. Subsequently the varnishing layer 3 of TPU based on polyether ESTANETM 54620 in powder having a thickness of 1.4 mm is deposited on the support layer and sintered with SLS (Selective Laser Sintering) systems.
  • SLS Selective Laser Sintering
  • the varnishing layer is subsequently surface finished through coupling with a PET Transfer release film having a thickness of 100 ⁇ m in a press heated to 150 °C at a pressure of 1.5 bar.
  • the varnishing layer 3 is a film of TPU ESTANETM 58437 deposited through fused filament having a thickness of 2.00 mm (fused deposition modeling, FDM) on the support layer made of TPU ISOPLAST with hardness 87 Shore D with a thickness of 350 ⁇ m and then surface finished through coupling FAVINI release paper film having a thickness of 100 ⁇ m in a press heated to 150°C with pressure of 4 bar, subsequently removed.
  • the blanket or slab for offset printing varnishing thus conceived is susceptible of numerous modifications and variants, all falling within the scope of the inventive concept; moreover, all of the details can be replaced with technically equivalent elements.
  • the varnishing layer made of non cross-linked thermoplastic polymer can also be made of silicone-based material.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Printing Plates And Materials Therefor (AREA)
  • Manufacture Or Reproduction Of Printing Formes (AREA)
  • Laminated Bodies (AREA)
EP19163104.3A 2018-03-21 2019-03-15 Procédé de réalisation d'une couverture ou d'une dalle de vernissage de surimpression Active EP3543012B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL19163104T PL3543012T3 (pl) 2018-03-21 2019-03-15 Proces wykonania obciągu lub płyty do lakierowania nadruku

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT102018000003853A IT201800003853A1 (it) 2018-03-21 2018-03-21 Processo per la realizzazione di una blanket o lastra di verniciatura di sovrastampa

Publications (3)

Publication Number Publication Date
EP3543012A2 true EP3543012A2 (fr) 2019-09-25
EP3543012A3 EP3543012A3 (fr) 2019-10-09
EP3543012B1 EP3543012B1 (fr) 2020-10-28

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP19163104.3A Active EP3543012B1 (fr) 2018-03-21 2019-03-15 Procédé de réalisation d'une couverture ou d'une dalle de vernissage de surimpression

Country Status (4)

Country Link
EP (1) EP3543012B1 (fr)
ES (1) ES2841850T3 (fr)
IT (1) IT201800003853A1 (fr)
PL (1) PL3543012T3 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20220176724A1 (en) * 2020-12-04 2022-06-09 Levi Acobas Roberto Blanket or slab for overprint varnishing
IT202100000902A1 (it) * 2021-01-19 2022-07-19 Acobas Roberto Levi Lastra di verniciatura in materiale termoplastico estruso per cilindro porta lastra di un gruppo flessografico di verniciatura

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103121323A (zh) 2013-02-23 2013-05-29 北京印刷学院 利用3d快速成型打印原理的柔性版ctp直接制版方法和设备

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6217965B1 (en) * 1997-05-23 2001-04-17 Creo Srl Flexographic varnishing plates
US7036430B2 (en) * 2002-12-26 2006-05-02 Creo Il Ltd. Method for producing a flexographic printing plate formed by inkjetted fluid
US20080034998A1 (en) * 2006-08-08 2008-02-14 Byers Joseph L Method of making a printing blanket or sleeve including cast polyurethane layers

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103121323A (zh) 2013-02-23 2013-05-29 北京印刷学院 利用3d快速成型打印原理的柔性版ctp直接制版方法和设备

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20220176724A1 (en) * 2020-12-04 2022-06-09 Levi Acobas Roberto Blanket or slab for overprint varnishing
IT202100000902A1 (it) * 2021-01-19 2022-07-19 Acobas Roberto Levi Lastra di verniciatura in materiale termoplastico estruso per cilindro porta lastra di un gruppo flessografico di verniciatura
WO2022157138A1 (fr) * 2021-01-19 2022-07-28 Roberto Levi Acobas Plaque de peinture faite en un matériau thermoplastique extrudé pour un cylindre porte-plaque d'une unité de peinture flexographique

Also Published As

Publication number Publication date
PL3543012T3 (pl) 2021-04-19
ES2841850T3 (es) 2021-07-09
IT201800003853A1 (it) 2019-09-21
EP3543012A3 (fr) 2019-10-09
EP3543012B1 (fr) 2020-10-28

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