EP3976881A1 - Verfahren zur lackierung von substraten sowie lackierte substrate - Google Patents
Verfahren zur lackierung von substraten sowie lackierte substrateInfo
- Publication number
- EP3976881A1 EP3976881A1 EP20728713.7A EP20728713A EP3976881A1 EP 3976881 A1 EP3976881 A1 EP 3976881A1 EP 20728713 A EP20728713 A EP 20728713A EP 3976881 A1 EP3976881 A1 EP 3976881A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- layer
- substrate
- printed product
- coating
- product according
- 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
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- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 claims description 5
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- 229920001169 thermoplastic Polymers 0.000 claims description 3
- 239000004416 thermosoftening plastic Substances 0.000 claims description 3
- OFOBLEOULBTSOW-UHFFFAOYSA-N Propanedioic acid Natural products OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 claims description 2
- VZCYOOQTPOCHFL-UPHRSURJSA-N maleic acid Chemical compound OC(=O)\C=C/C(O)=O VZCYOOQTPOCHFL-UPHRSURJSA-N 0.000 claims description 2
- 239000011976 maleic acid Substances 0.000 claims description 2
- 239000011146 organic particle Substances 0.000 claims description 2
- 238000007761 roller coating Methods 0.000 claims description 2
- 125000003011 styrenyl group Chemical class [H]\C(*)=C(/[H])C1=C([H])C([H])=C([H])C([H])=C1[H] 0.000 claims 1
- 238000007669 thermal treatment Methods 0.000 claims 1
- 239000010410 layer Substances 0.000 description 242
- 239000003973 paint Substances 0.000 description 18
- 239000002987 primer (paints) Substances 0.000 description 16
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- 239000011087 paperboard Substances 0.000 description 5
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- GLGNXYJARSMNGJ-VKTIVEEGSA-N (1s,2s,3r,4r)-3-[[5-chloro-2-[(1-ethyl-6-methoxy-2-oxo-4,5-dihydro-3h-1-benzazepin-7-yl)amino]pyrimidin-4-yl]amino]bicyclo[2.2.1]hept-5-ene-2-carboxamide Chemical compound CCN1C(=O)CCCC2=C(OC)C(NC=3N=C(C(=CN=3)Cl)N[C@H]3[C@H]([C@@]4([H])C[C@@]3(C=C4)[H])C(N)=O)=CC=C21 GLGNXYJARSMNGJ-VKTIVEEGSA-N 0.000 description 4
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- 238000007591 painting process Methods 0.000 description 4
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- NIXOWILDQLNWCW-UHFFFAOYSA-M acrylate group Chemical group C(C=C)(=O)[O-] NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 description 3
- 239000008199 coating composition Substances 0.000 description 3
- 239000003086 colorant Substances 0.000 description 3
- 239000000835 fiber Substances 0.000 description 3
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- ONBQEOIKXPHGMB-VBSBHUPXSA-N 1-[2-[(2s,3r,4s,5r)-3,4-dihydroxy-5-(hydroxymethyl)oxolan-2-yl]oxy-4,6-dihydroxyphenyl]-3-(4-hydroxyphenyl)propan-1-one Chemical compound O[C@@H]1[C@H](O)[C@@H](CO)O[C@H]1OC1=CC(O)=CC(O)=C1C(=O)CCC1=CC=C(O)C=C1 ONBQEOIKXPHGMB-VBSBHUPXSA-N 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
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- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
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Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H19/00—Coated paper; Coating material
- D21H19/80—Paper comprising more than one coating
- D21H19/82—Paper comprising more than one coating superposed
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
- B41M5/0011—Pre-treatment or treatment during printing of the recording material, e.g. heating, irradiating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
- B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
- B41M5/502—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording characterised by structural details, e.g. multilayer materials
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
- B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
- B41M5/52—Macromolecular coatings
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H19/00—Coated paper; Coating material
- D21H19/80—Paper comprising more than one coating
- D21H19/82—Paper comprising more than one coating superposed
- D21H19/824—Paper comprising more than one coating superposed two superposed coatings, both being non-pigmented
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M1/00—Inking and printing with a printer's forme
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
- B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
- B41M5/502—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording characterised by structural details, e.g. multilayer materials
- B41M5/506—Intermediate layers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
- B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
- B41M5/502—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording characterised by structural details, e.g. multilayer materials
- B41M5/508—Supports
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
- B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
- B41M5/52—Macromolecular coatings
- B41M5/5209—Coatings prepared by radiation-curing, e.g. using photopolymerisable compositions
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
- B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
- B41M5/52—Macromolecular coatings
- B41M5/5254—Macromolecular coatings characterised by the use of polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds, e.g. vinyl polymers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
- B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
- B41M5/52—Macromolecular coatings
- B41M5/5263—Macromolecular coatings characterised by the use of polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
- B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
- B41M5/52—Macromolecular coatings
- B41M5/5263—Macromolecular coatings characterised by the use of polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- B41M5/5272—Polyesters; Polycarbonates
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
- B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
- B41M5/52—Macromolecular coatings
- B41M5/5263—Macromolecular coatings characterised by the use of polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- B41M5/5281—Polyurethanes or polyureas
Definitions
- the invention generally relates to a method for painting substrates for producing coatings with high surface qualities, and substrates that are painted accordingly.
- the invention relates to a method for painting substrates with surfaces that are not completely closed by means of an ink-jet method, as well as correspondingly painted substrates.
- Printed products are often provided with one or more layers of lacquer.
- Layers of lacquer ensure a high-quality visual and haptic impression.
- a large part of the printed products for example in the form of print media or packaging, have graphic paper or cardboard as substrates.
- Papers are made from textile and plant fibers, possibly by additional glueing.
- the fibers absorb liquids (e.g. ink).
- Gluing reduces the absorbency but does not completely prevent it.
- Paper can therefore absorb liquids, including printing ink, to a certain extent. This has a disadvantageous effect on the quality of the print image of a corresponding print. To get the color into the
- coated substrates are therefore used in high-quality prints, for example in the case of picture printing paper.
- Coated substrates are understood here as meaning papers or cardboard, their
- the surface can be provided with a highly filled binder layer.
- This coating also referred to as a line, can have one or more layers and reduces the penetration of the printing ink into the surface of the substrate and smoothes the surface of the paper or cardboard by filling the depressions between the fibers.
- the coating slip contains inorganic particles as fillers in an organic binder. Due to the high degree of filling of the paper coating, the particles in the layer are not completely covered by binder. Due to the drying and the associated reduction in volume of the line, the particles can protrude far from the surface. With matt-coated substrates, the proportion of protruding particles is greater than with glossy-coated types. The most glossy ones are so-called cast-coated papers or cardboard. Here the binder itself is very shiny. Nevertheless, even with cast-coated papers, the particles on the surface are not all completely covered.
- undercuts can form, in which the particle surface is not completely surrounded by binder.
- the undercuts thus form flea spaces within the layer, viewed vertically from above.
- cavities can be formed due to incomplete covering of substrate pores.
- the film is torn upwards by the approaching droplet at the first contact between the droplet and the film, ie away from the substrate surface, before the droplet finally accommodates on the surface.
- the undercuts described above are below the point of impact of the droplet, then when approaching the droplet, this can also happen Material is pulled upwards so far that a channel to the trapped air is formed in the cavity of the undercut, which remains open to the surface of the liquid.
- These channels to the undercuts are referred to below as pinholes. The pinholes remain in the paint layer when the paint hardens and are visually noticeable imperfections in the paintwork.
- the surface tension of the liquid lacquer causes the pinholes to have an ever larger diameter as the layer thickness increases. Although the number of pinholes decreases with increasing layer thickness, they are more and more visible due to the larger diameter.
- the pinholes described represent a serious problem in inkjet printing, especially with UV-curing inks.
- Another method of applying a layer of lacquer to coated substrates provides for lamination of the substrate with a plastic film. This will make the
- Coating compound fills.
- the pinholes are closed.
- the coating compound is then cured to form the paint.
- a special device is required for this.
- the invention is thus based on the object of providing a method which enables painting, in particular painting by means of inkjet printing, of a substrate for producing coatings with a high surface quality, regardless of its surface structure and nature. Furthermore, a further object of the invention is to provide a preparation and a correspondingly lacquered printed product with a high surface quality.
- the invention relates to a method for producing a printed product with at least the following method steps a) to d)
- step b) curing of the layer applied in step b) by thermal or UV crosslinking of the functional groups to produce the sealing layer, the cured first layer having a layer thickness in the range from 1 to 10 mhi, d) application of a second layer to the surface the first layer.
- the layer hardened in step e) has a layer thickness in the range from 1 to 10 mhi. This layer thickness ensures that the coating is sufficiently thick so that
- sealing layer Also referred to below as the sealing layer.
- the substrate provided with the first layer is printed before step d).
- One embodiment of this development provides that the printing on the cured first layer, i.e. after step c) takes place.
- the substrate can also be printed after step b).
- the first layer is cured in step c) after the printing. In this way, the first layer and the printing layer can be cured together.
- the second layer is preferably applied by means of inkjet printing in step d).
- a closed surface within the meaning of the invention is understood to mean in particular a surface which has a pinhole density of less than 10 pinholes per dm 2 , preferably a maximum of 2 pinholes per dm 2 , particularly preferably a maximum of 1 pinhole per dm 2 To be recognized by the eye and otherwise disturb the print image considerably. For a really high-quality print, as is expected in the area of luxury packaging, for example, no defects should be recognizable on the lacquered surfaces.
- the number of pinholes depends on the substrate and the layer thickness. When painted substrates are painted without the sealing layer according to the invention, the number of pinholes decreases with the thickness of the paint layer. However, a decrease in the pinholes is not always associated with an improvement in the visual impression, since the diameter of the pinholes also influences their visibility. In the range up to approx. 4 mhi layer thickness, the diameter of the pinholes is very small. They visually convey the impression of no particles, which makes the resulting layer appear somewhat matt. Between 6-12mhi, the pinholes are very clearly visible. Although the number of pinholes decreases towards higher layer thicknesses, the enlargement of the craters at higher layer thicknesses means that the remaining pinholes disturb the appearance much more. The pinholes only disappear completely from a layer thickness of around 20 mhi (depending on the substrate).
- the layer thickness of the sealing layer is so small that the haptic
- Sealing layer are affected.
- a substrate coated with a sealing layer according to the invention can still be haptically identified as paper.
- the haptic properties of the plastic coating usually dominate with appropriately laminated paper.
- a layer thickness of the sealing layer in the range from 1 to 5 mhi and in particular from 2 to 3 mhi has proven to be particularly advantageous.
- the sealing layer can also be designed to be inconspicuous not only haptically but also visually.
- the sealing layer has according to one Embodiment a high transparency and little or no inherent color. In particular, no or only a very small amount occurs due to the sealing layer
- Sealing layer provided substrate is applied, be advantageous.
- the substrate quality is such that the above-described coating quality cannot be achieved with the layer thicknesses mentioned, it may also be necessary to increase the layer thickness of the sealing layer. Economically, this can still mean a clear advantage over lamination, since poorer substrate qualities are accessible to high-quality finishing, even if the haptic properties of the substrate, in particular when using radiation-curing sealing layers, are significantly changed.
- a line is applied to at least one surface of the printing substrate provided in step a).
- a line is understood to mean a coating compound with a high proportion of inorganic, particulate fillers in an organic binder.
- the substrate provided in step a) is a coated paper or a coated cardboard.
- the substrate provided in step a) is an uncoated paper or an uncoated cardboard.
- Such substrates have open surfaces. These are characterized by a high porosity and can therefore absorb liquids to a certain extent.
- uncoated papers and cardboard for example, are only suitable to a limited extent as substrates for inkjet printing processes, especially with UV-curable printing inks.
- the sealing layer according to the invention completely covers the pores and thus closes the surface.
- the sealing layer also provides a surface with homogeneous surface properties such as a homogeneous surface tension. This enables, for example, homogeneous flow properties of inks or coating agents applied with inkjet printing.
- the areas with the hydrophobic offset printing inks have a completely different surface tension than the unprinted substrate. If the transition between the unprinted and the printed area is used for painting, in particular using the inkjet method, the course of the paint on the unprinted substrate will differ from that on the printing ink
- the method according to the invention is therefore also suitable for coating substrates with closed surfaces such as, for example, plastics.
- the required layer thickness is significantly smaller and can be less than 1 mhi, since no structures on the substrate surface, such as pores or undercuts, have to be covered and closed by the sealing layer.
- step c) The curing or crosslinking of the first layer in step c) takes place according to a
- Embodiment of the invention by UV radiation or electron beam.
- the advantage of radiation-curing formulations is that they can do without solvents. Therefore, in the case of radiation-curing formulations, the first layer shows only a very low volume shrinkage during curing. The volume reduction is only due to the
- the substrate is provided with a cured first layer as a sealing layer before the painting step d), which the
- Sealing layer provided a closed surface, which due to their Layer properties such as roughness, homogeneity, surface tension or polarity can be printed very well.
- Layer properties such as roughness, homogeneity, surface tension or polarity
- it can be coated by means of inkjet printing.
- the hardened first layer “neutralizes” the surface of the substrate, so to speak.
- substrates for example inexpensive substrates or substrates that are less suitable for painting, can also differ due to their
- a further development of the invention provides that the first layer or sealing layer is applied in a laterally structured manner to the surface of the substrate provided in step a). This is understood in particular to mean that only partial areas of the substrate surface are coated with the sealing layer. According to this development, in step d) the second layer is only applied to partial areas of the sealing layer.
- the formulation applied in step d) is preferably applied to the first layer by means of inkjet printing.
- Inkjet printing is a flexible and inexpensive one
- the applied preparation can be applied in a laterally structured manner and thus the substrate can only be coated in certain surface areas without special printing forms being necessary for this.
- the preparation here preferably contains monomers, oligomers and / or prepolymers with at least one crosslinkable group.
- Acrylates, methacrylates or epoxides have proven to be particularly advantageous as crosslinkable groups.
- Vinyl esters are also suitable for this application.
- crosslinking of the crosslinkable groups and thus the crosslinking of the second layer preferably takes place in a step subsequent to step d).
- the crosslinking of the second layer by UV radiation, electron beam or thermal
- the cured second layer represents the lacquer layer.
- the lacquer layer can be designed as a matt lacquer or gloss lacquer.
- step b) the first layer is carried out according to one embodiment of the invention
- the preparation for producing the first layer contains at least one monomer, oligomer or prepolymer with at least one ok
- crosslinkable, functional group and a reactiwerd each contain at least one crosslinkable, functional group, which are crosslinked in step c).
- the viscosity of the preparation can be adjusted to the coating process used in step b).
- the preparation in step b) can be applied in particular by a flexographic printing process, a screen printing process, by gravure printing, with a roller or by knife-coating.
- the preparation is applied evenly to the surface of the substrate.
- the entire surface of the substrate is preferably provided with the coating in step b). For example, surface structures such as undercuts in the substrate are removed from the
- step b) Since the first layer deposited in step b) according to this embodiment has a
- a reactive diluent as a solvent, which is incorporated into the polymer network and thus, unlike a conventional solvent, remains in the layer, there is only a very slight reduction in volume during crosslinking. This ensures that, even after curing, the entire surface of the substrate coated in step b) is covered with the cured sealing layer.
- a reactive diluent i. E. a solvent that is bound in the polymer network during curing and thus remains in the layer, cracking or renewed exposure of the undercuts can be avoided.
- the layer deposited in step b) can also be compacted and smoothed by a calendering process.
- a thermoplastic lacquer system is applied to the substrate surface in step b), hardened by drying and then compacted with a polished stainless steel calender.
- the lacquer optionally also contains a crosslinkable group, so that in step c) of the method according to the invention, even in this variant of the invention, the first layer deposited in step b) is hardened. This reduces the thermoplasticity of the layer.
- the lacquer systems used to produce the lacquer layer calendered in step b) can contain organic solvents or water or be radiation-curing.
- hybrid paints also referred to as dual-cure paints, has proven to be particularly advantageous here. These paint systems are water-based, but also contain binders with unsaturated, crosslinkable acrylate groups.
- step c) Coating compound removed from this by drying water and volatile solvents.
- the lacquer obtained has a high thermoplasticity and can therefore be calendered well in step b).
- step c) UV curing then takes place by crosslinking the acrylate groups. This leads to high mechanical stability and a reduction in the thermoplasticity of the cured sealing layer.
- UV curing then takes place by crosslinking the acrylate groups.
- the first deposited layer has a sufficiently high mechanical stability even before the UV curing, so that it can be printed by means of an inkjet process without the undercuts opening during the printing process. Intermediate UV drying before a further coating step is therefore not absolutely necessary. According to a further development of this embodiment, the UV curing of the first deposited layer can therefore take place together with the curing of the second deposited layer. In this development, step d) takes place before step c).
- Substrates with calender varnishes as a sealing layer have particularly smooth surfaces.
- the surface of the substrates treated in this way is so smooth that when the surface is mirrored, the mirror image of the viewer is easily recognizable and is not too strongly distorted by surface undulation.
- Correspondingly coated substrates are therefore particularly suitable for applying coatings in the form of paints or lacquers, where particularly sharp contours and a high level of brilliance are important.
- One embodiment of the invention therefore provides that the second layer deposited in step d) so-called VMP colors, i.e. Colors based on
- vacuum metallized pigments This can be, for example, a printing ink that develops a high metallic luster after printing. In these colors, the pigments are in the form of flakes. A uniform alignment of the platelets leads to a high brilliance of the surface created with the color. The uniform alignment of the pigments is promoted by a very smooth surface. According to a further development, the in Step d) deposited layer has a mirror effect.
- the correspondingly coated substrates are suitable, for example, as a replacement for vacuum-metallized foils, in which a high metallic luster is achieved. Will be the same ink on one only with one on top
- the substrate unevenness results in a glossy but uneven layer in which the mirror image is slightly distorted.
- the lack of alignment of the pigments and the partial absorption of the printing ink produce a gray color layer.
- digital foil embossing in which the layer deposited in step d) represents an adhesive which, upon subsequent calendering with a suitable embossing foil, is given a shiny metallic surface.
- step b) a hybrid lacquer is deposited as the first layer with the aid of a slot nozzle or a so-called Mayer bar.
- the hybrid lacquer can also be applied to the substrate provided in step a) using a roller doctor blade method. In this way, too, extremely smooth surfaces are produced.
- the preparation applied in step b) can comprise isocyanate-crosslinking systems, polyurethanes, epoxy systems, acrylates, methacrylates, polyvinyl ethers, polyesters based on maleic and fumaric acid, styrene compounds or silicone acrylates.
- the preparation for setting the first layer can in particular by a flexographic printing process, a screen printing process, by gravure printing, with a roller, by doctoring, with a Mayer bar, with a slot nozzle or by means of curtain casting onto the in step a) provided substrate can be applied.
- the layer deposited in step b) can also be a full-area roller coating.
- the preparation for setting up the first layer additionally contains organic or inorganic particles.
- the preparation has in particular a solids content in the range from 2 to 40% by weight, preferably in the range from 5 to 25% by weight.
- the preparation contains polymer particles made from polyolefins, polyacrylates, polyamides and the like, talc particles, silicate particles and / or carbonate particles, in particular talc particles.
- the particles have a matting effect Effect so that the sealing layer produced from the corresponding has a low degree of gloss.
- the corresponding sealing layers have a particularly homogeneous and closed surface. This is achieved in particular through the interaction of inorganic particles and the liquid, UV-curable components of the preparation.
- the inorganic particles in the preparation lead to an increase in the structural viscosity.
- the particles increase the cohesive forces within the preparation.
- the closed surface of the film is no longer opened, or only opened to a small extent, in the course of the application process. Accordingly, surface defects and undercuts on the substrate surface are almost completely covered.
- preparations with inorganic particles form particularly stable films, the function of the sealing layer according to the invention is ensured even with very small layer thicknesses. Due to the increased intrinsic viscosity, the corresponding preparations are also particularly suitable for application processes in which the film is exposed to high adhesive forces, such as the flexographic printing process, for example.
- the invention further relates to a printed product comprising a substrate with a first and a second layer, the first and the second layer comprising an organic, crosslinked lacquer and having a closed surface.
- the first layer hereinafter also referred to as the sealing layer, is transparent and preferably colorless. Thus it is optically inconspicuous and does not affect the visual appearance or only to a small extent
- the layer thickness of the sealing layer is in the range from 1 to 10 mhi.
- the cured sealing layer has a layer thickness in the range from 1 to 5 mhi, particularly preferably in the range from 2 to 3 mhi.
- the second layer is applied to the sealing layer so that the second layer is separated from the substrate surface by the sealing layer.
- the second layer therefore has no contact with the substrate surface.
- the second layer can be the entire Cover the surface of the sealing layer.
- the second layer can also be arranged on the surface of the sealing layer only in regions, ie in a laterally structured manner.
- the first layer is a polymer layer crosslinked by radiation curing, an isocyanate crosslinking system, a polyurethane, an epoxy system, an acrylate, a methacrylate, a polyvinyl ether, a polyester on maleic and
- the second layer is a digital print applied by means of an inkjet method.
- the second layer preferably has a defect-free surface, whereby a defect-free surface is understood to mean in particular a surface with a pinhole density of less than 10 pinholes per dm 2 , preferably at most 2 pinholes per dm 2 and particularly preferably at most 1 pinhole per dm 2 .
- the pinholes can be seen with the naked eye and otherwise disrupt the print image considerably. For a really high-quality print, as is expected in the area of luxury packaging, for example, no defects should be recognizable on the lacquered surfaces.
- the first and the second layer are applied laterally structured on the substrate, the second layer being arranged on the entire surface of the sealing layer.
- the second layer forms at least on a portion of the with the
- Sealing layer provided substrate with a contiguous area
- the second layer is applied in a laterally structured manner to partial areas of the first layer.
- the second layer can thus be applied to the first layer in the form of lines, letters and / or symbols.
- the corresponding print image of the second layer preferably has a minimum line width of more than 1 mm, preferably more than 2 mm.
- Another embodiment provides that the second layer is arranged laterally structured on the first layer and the first and the second layer differ in their degree of gloss. This allows gloss and matt effects on individual areas of the
- Printed product can be achieved. Both variants are common here. Either the first layer has a higher degree of gloss than the second or vice versa.
- the substrate has a binder-containing, particulate coating on at least one surface and the first layer is applied to the binder-containing particulate coating.
- the substrate preferably comprises a coated paper or a coated cardboard.
- the substrate is an uncoated paper or an uncoated cardboard.
- FIG. 2 shows a schematic representation of a primer layer applied to the in FIG. 1
- FIG. 3 shows a schematic representation of the applied primer layer shown in FIG. 2 after the drying process
- FIG. 4 shows a schematic representation of a lacquer layer applied by means of an inkjet method in the coated paper shown in FIG. 3,
- FIG. 5 shows a schematic representation of a lacquer layer applied by means of an inkjet method in the coated paper shown in FIG. 2, 6 shows a schematic representation of an exemplary embodiment of the invention with a coated paper as the substrate,
- FIG. 7 shows a schematic representation of a lacquer layer applied to an uncoated paper
- Fig. 8 is a schematic representation of an embodiment of the invention with a
- FIG. 10 shows a schematic representation of an embodiment in which a lacquer layer has been applied to a calendered sealing layer
- Fig. 11 is a schematic representation of an embodiment with a calendered
- FIG. 13 shows a micrograph using the coaxial incident light of a coated paper varnished by means of inkjet printing as an exemplary embodiment with a 2.5 mm thick sealing layer
- FIG. 14 shows a micrograph using the coaxial incident light of a coated paper varnished by means of inkjet printing as an exemplary embodiment with a 4.5 mm thick sealing layer.
- Fig. 1 the surface of a coated paper 1 is shown schematically.
- Paper surface 2 is coated with a so-called line 3.
- the line 3 includes here Particulate, inorganic fillers 4 which are deposited on the paper surface 2 and are held together by an organic binder layer 5.
- the paper surface 2 is not smooth here, but rather has unevenness.
- so-called undercuts 6 are formed, which likewise cannot be filled with the binder 5.
- FIG. 2 schematically shows the coated paper shown in FIG. 1, which has been provided with a primer coating compound 15.
- a primer coating compound 15 This can be done, for example, by a flexographic printing process, a screen printing process, by gravure printing, with a roller, or by doctoring or curtain casting.
- the coating can also be a slot nozzle coating or a Mayer bar coating.
- the primer layer 15 has not yet dried and consists of a formulation which experiences a certain volume shrinkage during drying / curing. The not yet dried layer covers the
- FIG. 3 shows the corresponding primer layer 14 which was obtained by drying the coating compound 15 shown in FIG. Due to the drying process and the associated loss in volume of the coating compound 15, the substrate surface is no longer completely covered by the primer 14 obtained by drying the coating compound 15. Furthermore, the drying process also reduces the layer thickness of the primer layer 14 over the undercuts 6, as a result of which the film no longer completely covers the undercuts.
- a corresponding, coated paper 1 is coated with a layer of lacquer 7 by means of an inkjet process, channels to these imperfections arise at undercuts and cavities due to the impact of the inkjet droplets. This is shown schematically in FIG. 4 and in addition to the fact that craters, so-called pinholes 8, are formed in the deposited lacquer layer 7. These represent visually conspicuous defects in the lacquer layer 7, so that the substrate 1 is not suitable for surface refinement by means of inkjet coating.
- FIG. 5 shows a coated paper 1 which has been provided with a primer layer 14 and then a lacquer layer 7 has been applied by means of an ink-jet process.
- Primer layer 14 can be, for example, an aqueous primer.
- previously covered defects cf. FIG. 2 were opened up again due to volume shrinkage. These flaws produce pinholes 8 as flaws in the lacquer layer 7 applied over the primer layer.
- a substrate coated according to the invention is shown schematically first
- the lacquer layer 7 was also applied by means of inkjet printing, but the surface of the coated paper 1 is completely covered by a sealing layer 9.
- the sealing layer 9 thus separates the surface of the coated paper 1 from the lacquer layer 7 and covers the cavities in the coated paper which are formed by undercuts 6. Because the undercuts are completely covered, no channels can arise on undercuts during the inkjet coating of the sealing layer 9.
- the lacquer layer 7 thus has no craters or pinholes and is suitable for surface finishing.
- coated substrate 1 is first provided with a coating compound.
- a coating compound This can be done, for example, by a flexographic printing process, a screen printing process, by gravure printing, with a roller or by doctoring or curtain casting.
- the coating can also be a slot nozzle coating or a Mayer bar coating.
- the coating compound contains crosslinkable functional groups. After the coating compound has been applied to the surface of the substrate 1, the crosslinking or curing of the coating compound takes place via the crosslinkable functional groups.
- the crosslinkable groups here are preferably radiation-curing, so that the crosslinking can take place with the aid of a UV lamp in step c).
- There is only a very slight reduction in volume of the coating during crosslinking which is mainly due to the Polymerization shrinkage is due.
- As a result of the only slight reduction in volume during curing unlike, for example, with water-based primers (see FIG. 3), there is no tearing of the layer above undercuts that are not completely filled by the primer liquid, and the cured sealing layer 9 therefore has a closed surface.
- the cured sealing layer 9 thus represents an ideal surface for the inkjet printing process for depositing the lacquer layer 7.
- An uncoated paper 2 which has been provided with a lacquer layer 7 is shown schematically in FIG.
- the surface of the uncoated paper 2 is uneven and porous. This porosity means that part of the coating composition for producing the lacquer layer is absorbed by the paper in the period from application to curing of the coating composition through crosslinking or solvent depletion. As a result, the layer on the surface of the substrate becomes increasingly thinner. Since the substrate surface is locally different
- the coating compound is absorbed to different degrees in the different areas of the substrate surface, so that the
- Coating thickness varies across the substrate surface and the coating appears spotty.
- the substrate 2 is therefore not suitable for surface finishing by means of an inkjet process.
- FIG. 8 shows a second exemplary embodiment of a printed product according to the invention, the substrate being an uncoated paper 6 as in FIG.
- the substrate being an uncoated paper 6 as in FIG.
- the lacquer layer 7 thus also has a low roughness and a homogeneous, closed surface.
- the coating compound comprises so-called dual-cure coating preparations in one embodiment. These coating preparations are water-based and additionally contain radiation-curable functional groups.
- a drying step takes place in preparation for the coating on the substrate 1.
- the layer obtained in this way is thermoplastic and here, like the sealing layer 9 shown in FIG. 6, at least partially reproduces the unevenness of the substrate surface.
- the dried layer is compacted and smoothed by calendering. For this purpose, the layer is compacted with a polished stainless steel calender.
- the calendered layer 13 obtained in this way thus has a closed surface with a low surface roughness and a sufficiently high mechanical stability for the subsequent finishing even without further crosslinking of the functional groups.
- the lacquer layer 7 shown in FIG. 10 was applied by means of inkjet to the layer 13, which was very smooth as a result of the calendering.
- the surface quality obtained in this way is characterized by the fact that the unevenness of the substrate is almost completely compensated by the calendering, which results in an extremely smooth paint surface.
- the uncrosslinked radiation-curable functional groups remaining in the calendered layer 13 are also crosslinked
- the lacquer layer 16 contains platelet-shaped metal pigments (VMP inks). Due to the very smooth surface of the calendered sealing layer 13, these can be aligned parallel or at least largely parallel to the substrate surface, so that a very good mirror effect without distortions due to the VMP inks.
- VMP inks platelet-shaped metal pigments
- Substrate unevenness can be achieved.
- FIGS. 12 to 14 are microscope recordings with 12 times magnification with coaxial incident light of various two-dimensional images applied with inkjet varnishing
- Coating samples on cardboard substrates The samples shown in FIGS. 12 to 13 have the same substrate 1 and the same composition of the lacquer layer 7 and differ in the pretreatment of the substrate prior to the inkjet lacquering to produce the lacquer layer 7.
- the lacquer layer 7 was applied in a laterally structured manner so that the area 17 shows the untreated (FIG. 12) or pretreated (FIGS. 13 to 14) substrate without lacquer layer 7.
- the samples shown in FIGS. 12 and 13 represent comparison samples, the substrate 1 in FIG. 12 not having been pretreated before the painting process.
- the samples shown in FIG. 13 and FIG. 14 are two exemplary embodiments of the
- the sample shown in FIG. 12 here has a sealing layer 9 with a layer thickness of 2.5 mhi, the layer thickness of
- Sealing layer of the sample shown in Fig. 13 is 4.5 mhi.
- FIGS. 11 to 14 show the influence of a sealing layer on the pinhole density in the lacquer layer.
- the pinholes 8 can be seen in the figures as dark, point-like defects.
- the pinhole density that is to say the average number of pinholes 8 per cm 2 of coating area, decreases steadily from FIG. 11 to FIG. 14.
- the highest pinhole density of approx. 2000 / cm 2 has that which is applied directly to the untreated substrate 1
- Lacquer layer 7 (Fig. 11) on (with a layer thickness of 8 g / n).
- the pinholes 8 are generated by not covering or opening undercuts and pores during the inkjet printing process.
- FIGS. 12 and 13 have significantly lower pinhole densities of 25 / cm 2 (FIG. 12) and ⁇ 1 / cm 2 (FIG. 13). This is due to the inventive
- Substrates 1 are permanently covered. This advantageous effect of the sealing layer 9 is dependent on its layer thickness and increases with increasing layer thickness. Reference number
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- Laminated Bodies (AREA)
- Chemical & Material Sciences (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Organic Chemistry (AREA)
- Ink Jet (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Paper (AREA)
Abstract
Description
Claims
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DE102019114277.6A DE102019114277A1 (de) | 2019-05-28 | 2019-05-28 | Verfahren zur Lackierung von Substraten sowie lackierte Substrate |
PCT/EP2020/064438 WO2020239692A1 (de) | 2019-05-28 | 2020-05-25 | Verfahren zur lackierung von substraten sowie lackierte substrate |
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EP3976881A1 true EP3976881A1 (de) | 2022-04-06 |
EP3976881B1 EP3976881B1 (de) | 2024-04-10 |
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EP20728713.7A Active EP3976881B1 (de) | 2019-05-28 | 2020-05-25 | Verfahren zur lackierung von substraten sowie lackierte substrate |
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US (1) | US20220266615A1 (de) |
EP (1) | EP3976881B1 (de) |
CN (1) | CN114026288A (de) |
AU (1) | AU2020286082A1 (de) |
BR (1) | BR112021022884A2 (de) |
DE (1) | DE102019114277A1 (de) |
WO (1) | WO2020239692A1 (de) |
ZA (1) | ZA202110226B (de) |
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DE102021103564A1 (de) | 2021-02-16 | 2022-08-18 | Homag Gmbh | Verfahren sowie eine Vorrichtung zum Beschichten einer Oberfläche |
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US6218004B1 (en) * | 1995-04-06 | 2001-04-17 | David G. Shaw | Acrylate polymer coated sheet materials and method of production thereof |
CN1087695C (zh) * | 1997-01-23 | 2002-07-17 | 大赛璐化学工业株式会社 | 记录片材和其生产方法 |
KR100485996B1 (ko) * | 2000-08-25 | 2005-04-29 | 에스케이씨 주식회사 | 자외선 경화형 도포용 조성물 및 이를 채용한 광기록 매체 |
US6720042B2 (en) * | 2001-04-18 | 2004-04-13 | 3M Innovative Properties Company | Primed substrates comprising radiation cured ink jetted images |
US6589636B2 (en) * | 2001-06-29 | 2003-07-08 | 3M Innovative Properties Company | Solvent inkjet ink receptive films |
US20050153147A1 (en) * | 2004-01-14 | 2005-07-14 | Arkwright, Inc. | Ink-jet media having flexible radiation-cured and ink-receptive coatings |
JP4693782B2 (ja) * | 2004-11-19 | 2011-06-01 | キヤノン株式会社 | インクジェット用記録媒体及びその製造方法 |
JP4842744B2 (ja) * | 2006-09-12 | 2011-12-21 | 関西ペイント株式会社 | 印刷物及びこの印刷物形成に用いられる下地形成用塗料 |
DE102007034877A1 (de) | 2007-07-24 | 2009-01-29 | Schmid Rhyner Ag | Verfahren und Vorrichtung zum Auftrag von Kunststoffbeschichtungen |
DE102008063837A1 (de) * | 2008-12-19 | 2010-06-24 | Mankiewicz Gebr. & Co. Gmbh & Co Kg | Beschichtung und deren Herstellung mittels Inkjet-Druckverfahren |
JP5620891B2 (ja) * | 2011-08-22 | 2014-11-05 | 株式会社Dnpファインケミカル | 下塗り液、下塗り層、インクジェット記録方法、及び印刷物の製造方法 |
DE102012004195A1 (de) * | 2012-03-01 | 2013-09-05 | Giesecke & Devrient Gmbh | Verfahren zum Herstellen eines Wertdokuments und daraus erhältliches Wertdokument |
MX2015009018A (es) * | 2013-01-17 | 2015-09-07 | Sun Chemical Corp | Revestimiento de pintura de imprimacion ec para papel y carton. |
JP6246686B2 (ja) * | 2014-09-16 | 2017-12-13 | 富士フイルム株式会社 | インクジェット記録方法 |
WO2018143964A1 (en) * | 2017-01-31 | 2018-08-09 | Hewlett-Packard Development Company, L.P. | Inkjet printing |
-
2019
- 2019-05-28 DE DE102019114277.6A patent/DE102019114277A1/de active Pending
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2020
- 2020-05-25 CN CN202080039529.8A patent/CN114026288A/zh active Pending
- 2020-05-25 BR BR112021022884A patent/BR112021022884A2/pt unknown
- 2020-05-25 US US17/614,302 patent/US20220266615A1/en active Pending
- 2020-05-25 EP EP20728713.7A patent/EP3976881B1/de active Active
- 2020-05-25 AU AU2020286082A patent/AU2020286082A1/en active Pending
- 2020-05-25 WO PCT/EP2020/064438 patent/WO2020239692A1/de active Search and Examination
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2021
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ZA202110226B (en) | 2023-10-25 |
EP3976881B1 (de) | 2024-04-10 |
WO2020239692A1 (de) | 2020-12-03 |
BR112021022884A2 (pt) | 2022-01-04 |
DE102019114277A1 (de) | 2020-12-03 |
AU2020286082A1 (en) | 2022-02-03 |
CN114026288A (zh) | 2022-02-08 |
US20220266615A1 (en) | 2022-08-25 |
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