EP3543012A2 - Verfahren zur herstellung eines tuchs oder einer platte für überdrucklackierung - Google Patents
Verfahren zur herstellung eines tuchs oder einer platte für überdrucklackierung Download PDFInfo
- 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
- Authority
- 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
Links
- 238000000034 method Methods 0.000 title claims abstract description 35
- 230000008569 process Effects 0.000 title claims abstract description 29
- 239000000463 material Substances 0.000 claims abstract description 23
- 229920001169 thermoplastic Polymers 0.000 claims abstract description 21
- 239000000654 additive Substances 0.000 claims abstract description 12
- 230000000996 additive effect Effects 0.000 claims abstract description 6
- 238000005516 engineering process Methods 0.000 claims abstract description 4
- 239000004433 Thermoplastic polyurethane Substances 0.000 claims description 22
- 229920002803 thermoplastic polyurethane Polymers 0.000 claims description 22
- 229920000139 polyethylene terephthalate Polymers 0.000 claims description 9
- 239000005020 polyethylene terephthalate Substances 0.000 claims description 9
- 230000008021 deposition Effects 0.000 claims description 8
- 239000002904 solvent Substances 0.000 claims description 6
- YNJBWRMUSHSURL-UHFFFAOYSA-N trichloroacetic acid Chemical compound OC(=O)C(Cl)(Cl)Cl YNJBWRMUSHSURL-UHFFFAOYSA-N 0.000 claims description 6
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 claims description 4
- 238000004381 surface treatment Methods 0.000 claims description 4
- 239000003431 cross linking reagent Substances 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 239000012994 photoredox catalyst Substances 0.000 claims description 3
- 229920003229 poly(methyl methacrylate) Polymers 0.000 claims description 3
- 239000004417 polycarbonate Substances 0.000 claims description 3
- 239000004926 polymethyl methacrylate Substances 0.000 claims description 3
- 239000004800 polyvinyl chloride Substances 0.000 claims description 3
- 229920005573 silicon-containing polymer Polymers 0.000 claims description 3
- 239000004416 thermosoftening plastic Substances 0.000 claims description 3
- 239000003522 acrylic cement Substances 0.000 claims description 2
- 239000004744 fabric Substances 0.000 claims description 2
- 239000004014 plasticizer Substances 0.000 claims description 2
- 229920002994 synthetic fiber Polymers 0.000 claims description 2
- 229920000642 polymer Polymers 0.000 claims 2
- 239000002861 polymer material Substances 0.000 abstract description 4
- 239000010410 layer Substances 0.000 description 87
- 239000002966 varnish Substances 0.000 description 14
- 238000012546 transfer Methods 0.000 description 10
- 230000001070 adhesive effect Effects 0.000 description 7
- 238000010146 3D printing Methods 0.000 description 6
- 239000000853 adhesive Substances 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 6
- 238000007639 printing Methods 0.000 description 6
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 4
- 238000002360 preparation method Methods 0.000 description 4
- 238000000110 selective laser sintering Methods 0.000 description 4
- 230000003746 surface roughness Effects 0.000 description 4
- 239000004411 aluminium Substances 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 238000004132 cross linking Methods 0.000 description 3
- 229920001971 elastomer Polymers 0.000 description 3
- 238000001125 extrusion Methods 0.000 description 3
- 238000005406 washing Methods 0.000 description 3
- 239000004721 Polyphenylene oxide Substances 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 2
- 230000032798 delamination Effects 0.000 description 2
- 239000000976 ink Substances 0.000 description 2
- 238000000608 laser ablation Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000007645 offset printing Methods 0.000 description 2
- 229920000570 polyether Polymers 0.000 description 2
- 229920002635 polyurethane Polymers 0.000 description 2
- 239000004814 polyurethane Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229920002799 BoPET Polymers 0.000 description 1
- 239000005041 Mylar™ Substances 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 239000012790 adhesive layer Substances 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 125000004386 diacrylate group Chemical group 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000000806 elastomer Substances 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 239000012943 hotmelt Substances 0.000 description 1
- 239000011256 inorganic filler Substances 0.000 description 1
- 229910003475 inorganic filler Inorganic materials 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 239000012705 liquid precursor Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000012766 organic filler Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000004224 protection Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 239000012744 reinforcing agent Substances 0.000 description 1
- 239000002210 silicon-based material Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
Images
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)
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 (de) | 2019-09-25 |
EP3543012A3 EP3543012A3 (de) | 2019-10-09 |
EP3543012B1 EP3543012B1 (de) | 2020-10-28 |
Family
ID=62597897
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19163104.3A Active EP3543012B1 (de) | 2018-03-21 | 2019-03-15 | Verfahren zur herstellung eines tuchs oder einer platte für überdrucklackierung |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP3543012B1 (de) |
ES (1) | ES2841850T3 (de) |
IT (1) | IT201800003853A1 (de) |
PL (1) | PL3543012T3 (de) |
Cited By (2)
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)
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)
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 |
-
2018
- 2018-03-21 IT IT102018000003853A patent/IT201800003853A1/it unknown
-
2019
- 2019-03-15 PL PL19163104T patent/PL3543012T3/pl unknown
- 2019-03-15 ES ES19163104T patent/ES2841850T3/es active Active
- 2019-03-15 EP EP19163104.3A patent/EP3543012B1/de active Active
Patent Citations (1)
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)
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 (en) * | 2021-01-19 | 2022-07-28 | Roberto Levi Acobas | Painting plate made of extruded thermoplastic material for plate-holding cylinder of a flexographic painting unit |
Also Published As
Publication number | Publication date |
---|---|
PL3543012T3 (pl) | 2021-04-19 |
ES2841850T3 (es) | 2021-07-09 |
IT201800003853A1 (it) | 2019-09-21 |
EP3543012A3 (de) | 2019-10-09 |
EP3543012B1 (de) | 2020-10-28 |
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