CN117046699A - Method for producing a multi-coated flat product - Google Patents

Method for producing a multi-coated flat product Download PDF

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Publication number
CN117046699A
CN117046699A CN202310531709.3A CN202310531709A CN117046699A CN 117046699 A CN117046699 A CN 117046699A CN 202310531709 A CN202310531709 A CN 202310531709A CN 117046699 A CN117046699 A CN 117046699A
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CN
China
Prior art keywords
layer
pigment
fluid
effect
substrate
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.)
Pending
Application number
CN202310531709.3A
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Chinese (zh)
Inventor
J·佩希特
M·施米特-莱文
C·F·韦伯
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Heidelberger Druckmaschinen AG
Original Assignee
Heidelberger Druckmaschinen AG
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Filing date
Publication date
Application filed by Heidelberger Druckmaschinen AG filed Critical Heidelberger Druckmaschinen AG
Publication of CN117046699A publication Critical patent/CN117046699A/en
Pending legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
    • B05D5/06—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain multicolour or other optical effects
    • B05D5/067—Metallic effect
    • B05D5/068—Metallic effect achieved by multilayers
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D11/00—Inks
    • C09D11/02—Printing inks
    • C09D11/03—Printing inks characterised by features other than the chemical nature of the binder
    • C09D11/037—Printing inks characterised by features other than the chemical nature of the binder characterised by the pigment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/06—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to radiation
    • B05D3/061—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to radiation using U.V.
    • B05D3/065—After-treatment
    • B05D3/067—Curing or cross-linking the coating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
    • B05D5/06—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain multicolour or other optical effects
    • B05D5/061—Special surface effect
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
    • B05D5/06—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain multicolour or other optical effects
    • B05D5/065—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain multicolour or other optical effects having colour interferences or colour shifts or opalescent looking, flip-flop, two tones
    • B05D5/066—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain multicolour or other optical effects having colour interferences or colour shifts or opalescent looking, flip-flop, two tones achieved by multilayers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
    • B05D5/06—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain multicolour or other optical effects
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/50—Multilayers
    • B05D7/52—Two layers
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • C09D5/36—Pearl essence, e.g. coatings containing platelet-like pigments for pearl lustre

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Materials Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Laminated Bodies (AREA)

Abstract

The invention relates to a method for producing a multi-layer, in particular double-coated flat or printed product, wherein a substrate, such as paper, is provided, wherein a first layer (10) of a first fluid (11) is applied in a region (3) of the substrate (2), wherein the first fluid comprises a first pigment (12) having a first concentration that is not zero, such as a platelet-shaped metal or pearlescent or interference effect pigment, and wherein a second layer (20) of a second fluid (21) is applied in the region (3) on the first layer, wherein the second fluid comprises a second pigment (22) having a second concentration that is not zero, such as a platelet-shaped metal or pearlescent or interference effect pigment, wherein the first pigment and the second pigment differ from one another and/or wherein the first concentration and the second concentration differ from one another. Embodiments of the present invention advantageously produce coatings that produce strong optical effects, such as metallic effects, pearlescent effects, or interference effects, and avoid or reduce other drawbacks of the prior art.

Description

Method for producing a multi-coated flat product
Technical Field
The invention relates to a method for producing a multi-coated flat product having the features of the preamble of claim 1.
The technical field to which the invention pertains is the field of the graphic industry and in particular the field in which so-called effect pigments (Effekt-pigment) are used to produce or refine printed matter or to produce highly refined and thus high-quality printed matter (i.e. products having a metallic, pearlescent or interference effect).
Background
Various methods for refining flat products (or prints) are known, such as: performing a cold foil transfer of metal prior to printing using color; printing effect pigment colors using the corresponding offset colors; printing effect pigment colors using solvent-based colors in gravure printing; printing effect pigment colors using water-based or UV metallic colors in flexographic printing; printing a clear colorless primer and then printing a metallic varnish through two varnish applying mechanisms, typically at the end of the machine; the double Press method (Duo Press), i.e. printing the effect colour in a gloss/flexo mechanism before (multicolor) offset printing.
Pre-metallized substrates (such as aluminized paper or aluminium laminated cardboard) which additionally have a plastic layer on their surface, although perform very well, are subject to increasing pressure for environmental reasons due to their composite properties. In addition, the manufacturing costs are high. The cold foil process, while not producing plastic composites and thus being better from an environmental point of view, is costly to manufacture and thus relatively expensive, and ultimately produces plastic carrier foil as scrap. Thus, more and more brand manufacturers require methods of adding foil-free waste for environmental reasons. A single stage metallization varnishing process (such as in flexographic printing) generally provides only modest results, particularly on rough surfaces. The use of a primer, i.e. a smoothing (primer) layer, is also known and provides a better metallic effect during the single stage metallization. The metallic effect is only weak and often relatively dark in metallic colors, such as those printed using offset printing techniques. The layers produced in intaglio printing are generally based on Volatile Organic Compounds (VOC), i.e. organic solvents, which are also controversial from an environmental point of view. Leafing pigments in water-based bright stock are very good in terms of the metal quality achievable, and such pigments are capable of leafing up like leaves (aufschwimmen). However, such pigments are not abrasion-resistant (or scratch-resistant) or must additionally be protected by a further bright oil layer. Attempts are often made to improve this situation using expensive special bright stock with, for example, better metal effects.
The unpublished german patent application DE102021125055 discloses a method for producing a coating, wherein the coating has at least one (analiced) colorant (preferably a leafing pigment) enriched on the boundary surface, comprising the following steps: providing a curable liquid medium; the curable liquid medium includes at least one colorant enriched on a boundary surface; applying (Auftragen) the curable liquid medium to a carrier, wherein such colorant enriched at the boundary surface is enriched at the boundary surface between the curable liquid medium and ambient atmosphere; at least partially solidifying the solidifiable liquid medium on the carrier; and transferring the at least partially cured curable liquid medium from the carrier to the substrate such that the colorant enriched on the boundary surface lies flat on the substrate on the side of the carrier enriched on the carrier. The colorant may be an effect pigment.
On the left side of fig. 1 of the drawing of the present description (in zone B) there is shown a known solution according to the prior art: the first solution above and the second solution below. Both solutions comprise a substrate 30 having a surface 30a, on which surface 30a layer 40 is applied having a large layer thickness 40a (or a large layer thickness). Layer 40 is made up of a fluid 41 containing an effect pigment 42 or a plate 43. The first solution comprises non-leafing pigments and the second solution comprises leafing pigments. In order to protect the pigment that collects near the surface of the layer 40, the second solution additionally comprises a protective layer 44 composed of a protective fluid. The so-called advantages of a large layer thickness are: can be used for a plurality of small sheets/platesIs embedded in the layer to thereby enhance the optical effect of the layer. It can be seen that the first solution has drawbacks in that the slats 43 in the (thick) layer 40 are not forced to be oriented optimally parallel, which results in an incompletely clear optical effectDisplay ("expensive sheets are many but have too little effect"). In contrast, the second solution is disadvantageous because of the cost of the fluid and the protective layer ("the fluid and the protective fluid are expensive, but the effect is too small").
Disclosure of Invention
The object of the present invention is to provide an improved solution compared to the prior art, which in particular makes it possible to produce such a coating: the coating produces strong optical effects such as metallic effects (metaliffekt), pearlescent effects (perlglazeffekt) or interference effects (intersystem) and avoids or reduces other drawbacks of the prior art.
This object is achieved according to the invention by a method according to claim 1.
Advantageous and therefore preferred developments of the invention emerge from the dependent claims and from the description and the drawing.
The method according to the invention for producing a multi-layer (in particular double) coated flat product (or printed product), wherein a substrate (for example paper) is provided, is characterized in that a first layer of a first fluid is applied in the region of the substrate, wherein the first fluid comprises a first pigment, for example a platelet-shaped metallic effect or pearlescent or interference pigment, having a non-zero concentration, and a second layer of a second fluid is applied on the first layer in the region, wherein the second fluid comprises a platelet-shaped second pigment, for example a platelet-shaped metallic effect or pearlescent or interference pigment, having a non-zero second concentration, wherein the first pigment and the second pigment differ from one another and/or the first concentration and the second concentration differ from one another.
The present invention advantageously produces a coating that produces strong optical effects, such as metallic effects, pearlescent effects, or interference effects, and that avoids or reduces other drawbacks of the prior art.
The invention is based on the unexpected insight obtained in a large number of extensive attempts that if two separate (thin) layers are applied one after the other and above the other instead of a single (thick) layer, the desired perceived optical effect is in an advantageous way stronger on the one hand and more durable on the other hand. Alternatively, a lamina may contain too few plates to achieve adequate results.
The invention further makes use of the recognition that, when two layers are applied, different pigments or different pigment concentrations can be used in an advantageous manner, and this makes it possible to provide more or less cost-effective pigments in at least one layer in a cost-effective manner and to obtain or even improve the desired perceptible optical effect there.
The optical effect of the upper layer (i.e. the second layer) preferably does not completely cover the optical effect of the lower layer (i.e. the first layer), but only partially covers, or in other words: the optical effect of the multiple coating is proportionally composed of the optical effects of the two layers. In the desired case, the optical effect of the lower layer (bottom layer) enhances the optical effect of the upper layer (top layer). The layer thickness (or layer thickness) of the second layer can thus advantageously be selected to be thinner than the layer thickness (or layer strength) of the first layer if necessary.
The two pigments, namely the first pigment and the second pigment, are preferably effect pigments, in particular effect pigments which are dependent on the (viewing) angle, particularly preferably metallic effect pigments or pearlescent pigments or interference pigments, for example mica pigments, in particular metal oxide-coated mica pigments. The two fluids can be, for example, metallic inks, such as aluminum-based inks.
In the case where these two pigments are different from each other, the following can be set: the two pigments may cause substantially the same optical effect (i.e., such as metallic luster, pearlescence, or interference), but differ in terms of manufacture and/or materials and/or structure, such as from different manufacturers; the two pigments may cause different optical effects (such as metallic luster and pearlescence; metallic luster and interference; pearlescence and interference; preferably metallic luster pigments in the first layer and interference pigments in the second layer).
In the case where the two pigment concentrations are different, the following can be set: the concentration of the first layer may be less than the concentration of the second layer; the concentration of the second layer may be less than the concentration of the first layer.
The two cases mentioned above can also be combined, i.e. different pigments can be provided in different concentrations.
By "platelet-shaped pigment" is meant that the individual pigment particles are shaped like platelets, that is to say are substantially flat or planar. The ratio of the sheet thickness (in microns) to the sheet diameter (in microns) may preferably be in the range between 1:5 and 1:100.
It may be advantageous to use a low-cost (e.g. corn flake) pigment as the first (underlying or pre-colored) pigment. It may also be advantageous to provide only the second (upper or post-or final-colouring) pigment as a less costly pigment, such as a silver-based or vacuum metallic pigment; the second layer (as described above) may also be applied thinner or less.
The respective media of the first and second fluids in which the pigment is embedded are preferably transparent and/or non-hiding. The advantage of the multiple coating is that an increase in the optical effect can be achieved by at least two fluids.
The preferred modification of the present invention (simply referred to as "modification") will be described next.
A further development may be characterized in that the first layer and the second layer are each closed layers.
A further development may be characterized in that the first layer and/or the second layer are applied as an ungatated (ungatastere) and/or unstructured layer (auggebracht), respectively. Such layers may be applied through non-gridded or grid-free areas of the printing plate, for example, like so-called spot painting (spotlack).
A further development may be characterized in that the first layer is applied as a thin layer.
A modification may be characterized in that the (preferably thin) first layer has a layer thickness of 2g/m 2 To 4g/m 2 Between them.
A further development may be characterized in that the first fluid is metered using an anilox roller and applied in a flexographic printing process.
Improved structureThe method is characterized in that the anilox roller draws volume/draw volumeIs 7cm 3 /m 2 To 16cm 3 /m 2 Between them.
A further development may be characterized in that the second layer is applied as a thin layer.
A modification may be characterized in that the (preferably thin) second layer has a layer thickness of 2g/m 2 To 4g/m 2 Between them.
A further development may be characterized in that the second fluid is metered using an anilox roller and applied in a flexographic printing process.
An improved method may be characterized in that the anilox roller draws up 7cm 3 /m 2 To 16cm 3 /m 2 Between them.
It can be provided that the layer thickness of the first layer together with the layer thickness of the second layer (i.e. the layer thickness of the composite layer consisting of the first layer and the second layer) is 4g/m 2 To 8g/m 2 Between them.
A further development may be characterized in that not only the second pigment but also the first pigment is a platelet-shaped pigment.
A modification may be characterized in that the first pigment is a grey or black pigment, or the first pigment is carbon black. Such pigments are much less costly than platelet-shaped pigments having comparable optical effects.
A modification may be characterized in that the first fluid is applied to an uncoated surface of the substrate. If the substrate is coated paper (gestrichenes Papier) or the like, the paper primer (papierstich) should not be considered herein as a coating, i.e., the coated paper should be considered herein as uncoated.
An improvement may be characterized by smoothing/smoothing the surface of the substrate by applying a first fluid to the surfaceFor example, when the surface isSmoothing may be achieved when the number of holes is reduced by at least 5%, 10%, 20% or 25%.
A modification may be characterized in that the first fluid travels (verlaufen) past the surface of the substrate before the second fluid is applied so as to achieve smoothing. The method may provide for setting a predetermined period of time for the first fluid to travel undisturbed and substantially. A refinement may be characterized in that the first fluid is heat treated during travel.
A further development may be characterized in that the first fluid and/or the second fluid is smoothed by a smoothing foil (glatten Folie). The gloss effect can be enhanced in particular by this smoothing.
A modification may be characterized in that the flakes of the first pigment in the first layer are oriented (substantially) parallel to the surface of the substrate.
A modification may be characterized in that the flakes of the second pigment in the second layer are oriented (substantially) parallel to the surface of the substrate.
This orientation can be carried out in an advantageous manner without external intervention, preferably only by forced orientation or by a stereoscopic effect (sterische Effekte).
Such an orientation may facilitate the plates being oriented parallel to one another. The achievable or achieved optical effect can be improved in an advantageous manner by a parallel orientation (an orientation parallel to the surface and/or parallel to each other).
This orientation is preferably carried out in layers which have not been or have not been completely dried and/or cured, respectively.
A modification may be characterized in that the first pigment and the second pigment have mutually different Leafing properties (leaping-eiginschft), i.e. Leafing or non-Leafing. By Leafing pigments are meant pigments that float like leaves, i.e. those that accumulate in the area of the surface of the layer or densely underneath it. In contrast, so-called "non-leafing pigments" do not float or do not substantially float.
A modification may be characterized in that the first pigment is a leafing pigment. The first layer (or the first pigment floating on top of it) is covered by the second layer and is thus protected.
A modification may be characterized in that the second pigment is a non-leafing pigment. In this way, the second pigment is prevented from being rubbed off on the surface of the second layer, so that the optical effect is substantially permanently and completely maintained in an advantageous manner.
A further development may be characterized in that the first layer produces a metallic effect and/or the second layer produces a metallic effect. Metallic effects are understood to be optical or visual effects, preferably metallic or metalloid gloss.
A modification may be characterized in that the two layers produce a metallic effect and the metallic effect of the first layer enhances the metallic effect of the second layer.
A refinement may be characterized in that the first fluid and/or the second fluid has an aluminium-based metallic effect pigment.
A modification may be characterized in that the first layer produces a pearlescent effect and/or the second layer produces a pearlescent effect. The pearlescent effect is understood to be an optical or visual effect, preferably the luster of a mother-of-pearl or mother-of-pearl.
A modification may be characterized in that the two layers produce a pearlescent effect, and the pearlescent effect of the first layer enhances the pearlescent effect of the second layer.
A further development may be characterized in that the first layer produces an interference effect and/or the second layer produces an interference effect. Interference effects are understood to be optical or visual effects.
A modification may be characterized in that the two layers produce an interference effect and the interference effect of the first layer enhances the interference effect of the second layer.
A refinement may be characterized in that the first pigment and/or the second pigment is one of the following pigment types: cornflakes (cornflag), silverdolar, vacuum metal (VMP, vacuum Metallized Pigment).
A modification may be characterized in that the pigment concentration in the first fluid is between 5 and 15 weight percent.
A refinement may be characterized in that the pigment concentration in the first layer is between 5 and 15 weight percent.
A modification may be characterized in that the pigment concentration in the second fluid is between 5 and 15 weight percent.
A further development may be characterized in that the pigment concentration in the second layer is between 5 and 15 weight percent.
The concentration measurement is preferably carried out in a fluid which has not been applied accordingly or in a layer which has not been dried and/or cured accordingly.
A refinement may be characterized in that the first pigment and the second pigment have different dimensions from each other. For a platelet-shaped pigment, its diameter can be measured as a dimension.
A refinement may be characterized in that the first pigment and the second pigment have different size distributions from each other. For a plate-like pigment, the diameter distribution thereof can be measured as a size distribution.
A refinement may be characterised in that the first fluid is provided as a fluid having a viscosity between 50 mpa-s and 100 pa-s.
A refinement may be characterised in that the second fluid is provided as a fluid having a viscosity between 50 mpa-s and 500 pa-s.
Providing a fluid with an advantageous viscosity may improve the parallel orientation of the embedded plates; too high a viscosity may impair this orientation.
A refinement may be characterized in that the first fluid is provided as a first flexographic varnish and/or the second fluid is provided as a second flexographic varnish. A modification may be characterized in that the first and second flexographic oils differ from each other (not just in terms of pigment).
A modification may be characterized in that the first fluid is a UV curable or water based fluid.
A modification may be characterized in that the second fluid is a UV curable or water based fluid.
A refinement may be characterized in that the first fluid is a water-based fluid and the second fluid is a UV-curable fluid.
A modification may be characterized in that the first fluid dries and/or solidifies after its application and before the second fluid is applied. A modification may be characterized in that the second fluid dries and/or solidifies after its application.
A modification may be characterized in that the two fluids dry and/or solidify together after the second fluid is applied.
A development may be characterized in that the first fluid is applied in an offset printing process and/or a flexographic printing process and/or in a gravure printing process and/or in an ink printing process.
A development may be characterized in that the second fluid is applied in an offset printing process and/or a flexographic printing process and/or in a gravure printing process and/or in an ink printing process.
For example, provision may be made for the first fluid to be applied in an offset printing process and for the second fluid to be applied in a flexographic printing process. The two application mechanisms involved may be so-called Anilox roller mechanisms (Anilox-Werke).
For example, it can be provided that the first fluid is applied in a gravure printing process and the second fluid is applied in a gravure printing process, for example in a roll-gravure printing machine (roller-Tiefdruckmaschine).
A modification may be characterized in that the first fluid is provided and printed as a grey or silver grey ink or colour. Such inks or colors can be much cheaper than fluids with plate-like pigments that have comparable optical effects.
An improved method may be characterized by producing a single-or multi-color printed image on the second layer, or by producing a single-or multi-color printed image and a covercoat paint on the second layer
A further development may be characterized in that the printed image is printed in an offset printing process.
An improvement may be characterized in that the following objects are provided as substrates: paper, cardboard or plastic foil, respectively as a sheet or as a web.
A refinement may be characterized in that the method is performed using a sheet offset printing press, the sheet Zhang Jiaoban printing press comprising at least one offset printing mechanism and one or more of the following units: a flexographic printing mechanism, a gloss oil mechanism, an infrared and/or hot air drying device and an ultraviolet curing device.
A modification may be characterized in that the first fluid is a metallic varnish based on a dispersed varnish, which has leafing pigments and is preferably applied and dried in a flexographic printing process.
A modification may be characterized in that the second fluid is a metallic varnish based on a dispersed or UV varnish, which has a non-leafing pigment of the silver or vacuum metallic type and is applied and dried and/or cured in a flexographic printing process.
A modification may be characterized in that the second fluid is a dispersed or UV-bright stock and comprises an interference pigment as the second pigment.
A modification may be characterized in that both fluids are UV-curable, the first fluid comprising corn flake pigment and being applied in a medium layer thickness (or layer thickness) in a flexographic printing process (e.g., having flutes and a pick-up of about 13cm using a dosing fluid) 3 /m 2 Up to about 16cm 3 /m 2 The first fluid is smoothed (for example on the path of travel and preferably under the action of heat), optionally UV intermediate cured, and the second fluid comprises a so-called vacuum metallic pigment and is applied only thinly (preferably thinner than the first layer) in the flexographic printing process (for example with a metering fluid draw of about 9 cm) 3 /m 2 Is used) and finally UV final curing.
Any combination of features and combinations of features disclosed in the paragraphs of the above technical field, invention and improvements and in the paragraphs of the examples below presents further advantageous improvements of the invention.
Drawings
Fig. 1 shows schematic cross-sectional views of two preferred embodiments of the method according to the invention; and
fig. 2 shows a schematic view of a preferred embodiment of a machine for performing the method according to the invention.
Detailed Description
Fig. 1 shows two preferred embodiments of the invention (multi-coated flat products manufactured according to the invention) in the right-hand region a and the prior art in the left-hand region B. The region a and the region B are each divided into respective upper and lower sections.
A first preferred embodiment of the invention is shown in the upper section of zone a. A second preferred embodiment of the invention is shown in the lower section of zone a. Shown are products 1 each having a substrate 2, the substrate 2 comprising a surface 2a. In the region 3, a (lower) first layer 10 is applied on the surface 2a and a (upper) second layer 20 is applied on the first layer 10 (or its surface). Optionally, a (preferably multi-colored) printed image 4 may be applied on the second layer 20. The first layer 10 is constituted by the applied first fluid 11 and comprises a first plate-like pigment 12 (or plate 13); the first layer 10 has a (small) first layer thickness 10a. The second layer 20 is constituted by the applied second fluid 21 and comprises a second plate-like pigment 22 (or plate 23), which second layer 20 has a (small) second layer thickness 20a. The respective fluids 11 and 21 may be dried and/or solidified; correspondingly, the respective layer 10 or 20 may be a solid layer. These pigments 12 and 22 are effect pigments. As is evident from both embodiments, the respective plates 13 are oriented parallel to the surface 2a of the substrate 2 or parallel to each other. This orientation or oriented state enhances the effect of these effect pigments (or pigment layers).
In the upper section of the area a (first preferred embodiment) it can be seen that both the slabs 13 and 23 have so-called Non-floating properties (Non-leaf-eiginschaft), i.e. that these slabs are not floating up like leaves and are accordingly not gathered near the respective surfaces of the layers 10 or 20. In contrast, in the lower section of the region a (second preferred embodiment) it can be seen that the slats 13 have floating properties, i.e. they float up like a leaf and accordingly accumulate near the surface of the underlying layer 10. The difference is that the plate 23 has unchanged still non-floating properties. In both preferred embodiments, it is advantageous that the sheet 23 has non-floating properties and accordingly does not collect near the surface of the layer 20, since in this way the desired effect of the observable effect pigment 22 can be made less likely to be destroyed and more stable (e.g. more scratch-resistant). It is advantageous in view of the second preferred embodiment (lower section of region a) that the plate 13 has floating properties and accordingly gathers in the vicinity of the surface of the layer 10, since in this way the desired effect of the observable effect pigment 12 can be enhanced.
If the embodiment according to the invention shown in region a is compared with the solution according to the prior art shown in the side region B respectively, it can be seen that the respective layer thicknesses 10a and 20a of the layers 10 and 20 produced according to the invention are themselves smaller than the layer thickness 40a of the layer 40 produced according to the prior art. Thus, these layers 10 and 20 may be referred to as thin layers or thinner layers as compared to the prior art.
If the embodiment according to the invention shown in region a is compared with the solution according to the prior art shown in the side region B respectively, it can be further seen that these two embodiments according to the invention have advantages over the prior art. In the respective upper sections of the areas a and B, it can be seen that the plates 13 and 23 are better oriented in the two (thinner) layers 10 and 20 than the plates 43 in the (thicker) layer 40. Accordingly, an improved observable effect of the effect pigment can be achieved according to the present invention. The same is true for the respective lower sections of regions a and B, where another advantage can be seen: in the case of using a pigment having leafing properties (leafing pigment), the protective layer 44 must be applied in the prior art. In contrast, in the production according to the invention, pigments 12 and 22 can be used in the layers 10 and 20, these pigments 12 and 22 having different leafing properties, preferably pigments with leafing properties (leafing pigments) being used in the (lower) first layer 10 and pigments with non-leafing properties (non-leafing pigments) being used in the (upper) second layer 20.
If the embodiments according to the invention shown in region a are compared with one another, it can also be seen that the embodiments shown above comprise different effect pigments 12 and 22 in the two layers 10 and 20 (in the case of, for example, substantially identical pigment concentrations), while the embodiments shown below comprise different pigment concentrations in the two layers 10 and 20 (in the case of, for example, substantially identical effect pigments 12 and 22).
Fig. 2 shows a machine for performing the method according to the invention or when performing such a method, such as a printing press 50 for processing sheets or webs. The printing press 50 conveys the substrate 2 from the device 52 in the conveying direction 51 through a plurality of mechanisms 53 to 57 to a device 58. The device 52 may be a device for feeding in/out the base sheet (Anlegen) or a device for unwinding the base web. Likewise, the device 58 may be a device for feeding out/receiving a substrate sheet (ausegen) or a device for rolling up a substrate web. The substrate may be pre-colored or may be loaded/pre-printed with one or more colors, such as by a printing or coating mechanism (not shown) upstream of the application mechanism 53.
In the first application mechanism 53, the first fluid 11 together with the first pigment 12 may be applied as a (thin) first layer 10 onto the substrate 2; an anilox roller 60 may be used for dosing the first fluid. In the next first alternative mechanism 54, the first layer 10 may be dried and/or cured, preferably using the device 61. In the first alternative mechanism 54 or in another alternative mechanism 54, the first layer 10 may be smoothed, preferably using a foil-handling (smoothing) device.
In the second application mechanism 55, the second fluid 21 together with the second pigment 22 may be applied as a (thin) second layer 20 onto the substrate 2 (or onto the first layer 10 that has been applied before); an anilox roller 60 may be used for dosing the second fluid. In the next second alternative mechanism 56, the second layer 20 may be dried and/or cured, preferably using the device 61; alternatively, the two layers 10 and 20 may be dried and/or cured. In the second alternative mechanism 56 or in another alternative mechanism 56, the second layer 20 may be smoothed, preferably using a foil-handling (smoothing) device.
In other alternative mechanisms 57, the substrate 2 may be printed, preferably in multiple colors (such as cmy+k or cmy+k+ogv or in one or more special colors such as pantone/spot colors) and preferably applied to a dual coating consisting of the first layer 10 and the second layer 20.
List of reference numerals
1. Product(s)
2. Substrate
2a substrate surface
3. Region(s)
4. Printing an image
10. First layer
10a first layer thickness
11. First fluid
12. First pigment
13. Plate sheet
20. Second layer
20a second layer thickness
21. A second fluid
22. Second pigment
23. Plate sheet
30. Substrate (prior art)
30a surface (Prior Art)
40. Layer (prior art)
40a layer thickness (prior art)
41. Fluid (prior art)
42. Pigment (prior art)
43. Plate sheet
44. Protective layer
50. Printing machine
51. Direction of conveyance
52. Device for feeding sheets or unwinding webs
53. First applying mechanism
54. First alternative mechanism or first road section
55. Second applying mechanism
56. Second alternative mechanism or second road section
57. Other alternative mechanisms
58. Device for feeding out sheets or rolled-up webs
60. Anilox roller
61. Device for drying and/or curing
62. Device for foil treatment
Examples of the invention
B Prior Art

Claims (10)

1. A method for producing a multi-coated flat product, wherein a substrate is provided,
it is characterized in that the method comprises the steps of,
in a region (3) of the substrate (2), a first layer (10) of a first fluid (11) is applied, wherein the first fluid comprises a first pigment (12) in a first concentration that is not zero, and
in the region (3), a second layer (20) of a second fluid (21) is applied to the first layer, wherein the second fluid comprises a second pigment (22) in the form of a plate at a second concentration which is not zero,
wherein the first pigment and the second pigment are different from each other and/or the first concentration and the second concentration are different from each other.
2. The method according to claim 1,
it is characterized in that the method comprises the steps of,
the first layer (10) and the second layer (20) are closed layers (10, 20), respectively.
3. The method according to claim 2,
it is characterized in that the method comprises the steps of,
the first layer (10) and/or the second layer (20) are applied as an ungrooved and/or unstructured layer (10, 20), respectively.
4. The method according to any of the preceding claims, characterized in that,
the layer thickness of the first layer (10) is 2g/m 2 To 4g/m 2 Between, and/or
The layer thickness of the second layer (20) is 2g/m 2 To 4g/m 2 Between them.
5. The method according to any of the preceding claims, characterized in that,
the first pigment (12) is a platelet-shaped pigment.
6. The method according to any of the preceding claims, characterized in that,
applying the first fluid (11) to an uncoated surface (2 a) of the substrate (2), and/or
Smoothing of the surface (2 a) of the substrate (2) is achieved by applying the first fluid (11) to the surface.
7. The method according to any of the preceding claims, characterized in that,
the flakes (13) of the first pigment (12) in the first layer (10) are oriented parallel to the surface (2 a) of the substrate (2), and/or
The flakes (23) of the second pigment (22) in the second layer (20) are oriented parallel to the surface (2 a) of the substrate (2).
8. The method according to any of the preceding claims, characterized in that,
the first pigment (12) and the second pigment (22) have leafing properties, i.e., leafing or non-leafing, that are different from each other.
9. The method according to any of the preceding claims, characterized in that,
the two layers (10, 20) produce a metallic effect and the metallic effect of the first layer (10) enhances the metallic effect of the second layer (20), or
The two layers (10, 20) produce a pearlescent effect, and the pearlescent effect of the first layer (10) enhances the pearlescent effect of the second layer (20), or
The two layers (10, 20) produce an interference effect, and the interference effect of the first layer (10) enhances the interference effect of the second layer (20).
10. The method according to any of the preceding claims, characterized in that,
producing a mono-or polychromatic printed image (4) on the second layer (20), or
-producing a mono-or polychromatic printed image (4) and an overlay lacquer on the second layer (20).
CN202310531709.3A 2022-05-11 2023-05-11 Method for producing a multi-coated flat product Pending CN117046699A (en)

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DE102022111751.0 2022-05-11

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DE (1) DE102023109578A1 (en)

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Publication number Priority date Publication date Assignee Title
DE102021125055A1 (en) 2021-09-28 2023-03-30 Heidelberger Druckmaschinen Aktiengesellschaft Process for the production of mechanically robust colorant-containing coatings

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