EP2774770A1 - Method for printing a wood fibre panel and wood fibre panel with a printed decorative layer - Google Patents
Method for printing a wood fibre panel and wood fibre panel with a printed decorative layer Download PDFInfo
- Publication number
- EP2774770A1 EP2774770A1 EP13158397.3A EP13158397A EP2774770A1 EP 2774770 A1 EP2774770 A1 EP 2774770A1 EP 13158397 A EP13158397 A EP 13158397A EP 2774770 A1 EP2774770 A1 EP 2774770A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- wood
- protective layer
- layer
- based panel
- resin
- 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
- 238000007639 printing Methods 0.000 title claims abstract description 66
- 238000000034 method Methods 0.000 title claims abstract description 43
- 229920002522 Wood fibre Polymers 0.000 title claims description 5
- 239000002023 wood Substances 0.000 claims abstract description 75
- 239000010410 layer Substances 0.000 claims abstract description 74
- 229920005989 resin Polymers 0.000 claims abstract description 54
- 239000011347 resin Substances 0.000 claims abstract description 54
- 239000011241 protective layer Substances 0.000 claims abstract description 53
- 229920002635 polyurethane Polymers 0.000 claims abstract description 25
- 239000004814 polyurethane Substances 0.000 claims abstract description 23
- 239000000463 material Substances 0.000 claims abstract description 15
- 238000001035 drying Methods 0.000 claims abstract description 11
- 239000004922 lacquer Substances 0.000 claims description 20
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 claims description 12
- 229920000877 Melamine resin Polymers 0.000 claims description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
- 239000000835 fiber Substances 0.000 claims description 9
- 239000000945 filler Substances 0.000 claims description 9
- 239000000203 mixture Substances 0.000 claims description 8
- 150000001252 acrylic acid derivatives Chemical class 0.000 claims description 7
- 229920001807 Urea-formaldehyde Polymers 0.000 claims description 6
- 238000005299 abrasion Methods 0.000 claims description 6
- -1 aliphatic urethanes Chemical class 0.000 claims description 5
- 238000005516 engineering process Methods 0.000 claims description 5
- 239000002245 particle Substances 0.000 claims description 5
- 239000000654 additive Substances 0.000 claims description 4
- 229920002994 synthetic fiber Polymers 0.000 claims description 4
- 239000012209 synthetic fiber Substances 0.000 claims description 4
- 239000004593 Epoxy Substances 0.000 claims description 3
- GZCGUPFRVQAUEE-SLPGGIOYSA-N aldehydo-D-glucose Chemical compound OC[C@@H](O)[C@@H](O)[C@H](O)[C@@H](O)C=O GZCGUPFRVQAUEE-SLPGGIOYSA-N 0.000 claims description 3
- HANVTCGOAROXMV-UHFFFAOYSA-N formaldehyde;1,3,5-triazine-2,4,6-triamine;urea Chemical compound O=C.NC(N)=O.NC1=NC(N)=NC(N)=N1 HANVTCGOAROXMV-UHFFFAOYSA-N 0.000 claims description 3
- 239000002025 wood fiber Substances 0.000 claims description 3
- 125000003700 epoxy group Chemical group 0.000 claims description 2
- 229920000647 polyepoxide Polymers 0.000 claims description 2
- 239000002966 varnish Substances 0.000 abstract description 12
- 230000037452 priming Effects 0.000 abstract 1
- 239000000976 ink Substances 0.000 description 23
- 239000007788 liquid Substances 0.000 description 11
- 238000000576 coating method Methods 0.000 description 9
- 239000003973 paint Substances 0.000 description 9
- 239000011248 coating agent Substances 0.000 description 8
- 239000000123 paper Substances 0.000 description 8
- 239000000243 solution Substances 0.000 description 8
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 6
- 239000000126 substance Substances 0.000 description 6
- 239000011094 fiberboard Substances 0.000 description 4
- 238000007646 gravure printing Methods 0.000 description 4
- 230000005855 radiation Effects 0.000 description 4
- 239000004640 Melamine resin Substances 0.000 description 3
- 230000009969 flowable effect Effects 0.000 description 3
- 238000012432 intermediate storage Methods 0.000 description 3
- 230000001681 protective effect Effects 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 239000002904 solvent Substances 0.000 description 3
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical class C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000004132 cross linking Methods 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 150000002118 epoxides Chemical class 0.000 description 2
- 239000003063 flame retardant Substances 0.000 description 2
- 239000004816 latex Substances 0.000 description 2
- 229920000126 latex Polymers 0.000 description 2
- 239000002346 layers by function Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000000178 monomer Substances 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 239000004848 polyfunctional curative Substances 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 238000007670 refining Methods 0.000 description 2
- 238000006748 scratching Methods 0.000 description 2
- 230000002393 scratching effect Effects 0.000 description 2
- 229920003002 synthetic resin Polymers 0.000 description 2
- 239000000057 synthetic resin Substances 0.000 description 2
- 229920001187 thermosetting polymer Polymers 0.000 description 2
- 239000000080 wetting agent Substances 0.000 description 2
- VOBUAPTXJKMNCT-UHFFFAOYSA-N 1-prop-2-enoyloxyhexyl prop-2-enoate Chemical compound CCCCCC(OC(=O)C=C)OC(=O)C=C VOBUAPTXJKMNCT-UHFFFAOYSA-N 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical class [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 239000004114 Ammonium polyphosphate Substances 0.000 description 1
- 244000025254 Cannabis sativa Species 0.000 description 1
- 235000012766 Cannabis sativa ssp. sativa var. sativa Nutrition 0.000 description 1
- 235000012765 Cannabis sativa ssp. sativa var. spontanea Nutrition 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- 229920003043 Cellulose fiber Polymers 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- 239000004721 Polyphenylene oxide Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical class O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 239000005083 Zinc sulfide Substances 0.000 description 1
- 125000005396 acrylic acid ester group Chemical group 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 150000004645 aluminates Chemical class 0.000 description 1
- 229920003180 amino resin Polymers 0.000 description 1
- 229920001276 ammonium polyphosphate Polymers 0.000 description 1
- 235000019826 ammonium polyphosphate Nutrition 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical class OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- 150000001642 boronic acid derivatives Chemical class 0.000 description 1
- 235000009120 camo Nutrition 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 239000002041 carbon nanotube Substances 0.000 description 1
- 229910021393 carbon nanotube Inorganic materials 0.000 description 1
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 235000005607 chanvre indien Nutrition 0.000 description 1
- 239000011093 chipboard Substances 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 239000010431 corundum Substances 0.000 description 1
- 238000005034 decoration Methods 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 239000003085 diluting agent Substances 0.000 description 1
- 238000010017 direct printing Methods 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- UHESRSKEBRADOO-UHFFFAOYSA-N ethyl carbamate;prop-2-enoic acid Chemical compound OC(=O)C=C.CCOC(N)=O UHESRSKEBRADOO-UHFFFAOYSA-N 0.000 description 1
- 238000009408 flooring Methods 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 239000010440 gypsum Substances 0.000 description 1
- 229910052602 gypsum Inorganic materials 0.000 description 1
- LNEPOXFFQSENCJ-UHFFFAOYSA-N haloperidol Chemical compound C1CC(O)(C=2C=CC(Cl)=CC=2)CCN1CCCC(=O)C1=CC=C(F)C=C1 LNEPOXFFQSENCJ-UHFFFAOYSA-N 0.000 description 1
- 239000011487 hemp Substances 0.000 description 1
- 229920000592 inorganic polymer Polymers 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000002105 nanoparticle Substances 0.000 description 1
- 229920000620 organic polymer Polymers 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- 235000021317 phosphate Nutrition 0.000 description 1
- 150000003013 phosphoric acid derivatives Chemical class 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 239000011120 plywood Substances 0.000 description 1
- 229920000058 polyacrylate Polymers 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920000570 polyether Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 229920005749 polyurethane resin Polymers 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 150000004756 silanes Chemical class 0.000 description 1
- 229910010271 silicon carbide Inorganic materials 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 150000005846 sugar alcohols Polymers 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- JEJAMASKDTUEBZ-UHFFFAOYSA-N tris(1,1,3-tribromo-2,2-dimethylpropyl) phosphate Chemical compound BrCC(C)(C)C(Br)(Br)OP(=O)(OC(Br)(Br)C(C)(C)CBr)OC(Br)(Br)C(C)(C)CBr JEJAMASKDTUEBZ-UHFFFAOYSA-N 0.000 description 1
- BIKXLKXABVUSMH-UHFFFAOYSA-N trizinc;diborate Chemical compound [Zn+2].[Zn+2].[Zn+2].[O-]B([O-])[O-].[O-]B([O-])[O-] BIKXLKXABVUSMH-UHFFFAOYSA-N 0.000 description 1
- 210000002268 wool Anatomy 0.000 description 1
- 229910052984 zinc sulfide Inorganic materials 0.000 description 1
- DRDVZXDWVBGGMH-UHFFFAOYSA-N zinc;sulfide Chemical compound [S-2].[Zn+2] DRDVZXDWVBGGMH-UHFFFAOYSA-N 0.000 description 1
Images
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
- 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
- B05D7/06—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 to wood
- B05D7/08—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 to wood using synthetic lacquers or varnishes
-
- 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
- B41M5/0041—Digital printing on surfaces other than ordinary paper
- B41M5/0047—Digital printing on surfaces other than ordinary paper by ink-jet printing
-
- 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
- B41M5/0041—Digital printing on surfaces other than ordinary paper
- B41M5/0076—Digital printing on surfaces other than ordinary paper on wooden surfaces, leather, linoleum, skin, or flowers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M7/00—After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock
- B41M7/0036—After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock using protective coatings or layers dried without curing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M7/00—After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock
- B41M7/0045—After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock using protective coatings or film forming compositions cured by mechanical wave energy, e.g. ultrasonics, cured by electromagnetic radiation or waves, e.g. ultraviolet radiation, electron beams, or cured by magnetic or electric fields, e.g. electric discharge, plasma
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B44—DECORATIVE ARTS
- B44C—PRODUCING DECORATIVE EFFECTS; MOSAICS; TARSIA WORK; PAPERHANGING
- B44C1/00—Processes, not specifically provided for elsewhere, for producing decorative surface effects
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/24802—Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.]
- Y10T428/24851—Intermediate layer is discontinuous or differential
- Y10T428/24868—Translucent outer layer
- Y10T428/24884—Translucent layer comprises natural oil, wax, resin, gum, glue, gelatin
Definitions
- the present invention relates to a method for printing wood-based panels according to claim 1 and a wood-based panel with printed decorative layer according to claim 13.
- wood-based panels in the furniture industry, as floor coverings or for covering walls and ceilings requires a processing or refinement of the surface of the wood-based panels.
- the wood-based panels are coated with decorative paper.
- decorative paper There are no limits to the variety of differently patterned decorative papers, so that wood-based panels with a variety of different decors such. Stone or wood decors are available.
- the printing techniques mainly used here are gravure printing and digital printing.
- the gravure printing process is a printing technique in which the elements to be imaged are in the form of depressions in a printing form which is inked before printing.
- the ink is located primarily in the wells and is transmitted due to contact pressure of the printing plate and adhesive forces on the object to be printed.
- digital printing on the other hand, the print image is transferred directly from a computer to a printing machine, such as a digital press. Laser printer or inkjet printer. The use of a static printing form is eliminated.
- Another aspect is that during transport and / or handling of plates with unprotected decorative prints on top in a production chain with dirt and / or damage to the decor is to be expected. This leads to quality degradation, but can often be identified late in the production chain, so that high costs and costs follow.
- the present invention is therefore based on the object to improve the digital printing process for wood-based panels so far, so that transport and handling decorated panels without quality losses are possible and at the same time restrictions in further processing are largely overcome.
- the present method provides a protective layer on a digitally printed wood-based panel which is at the same time arranged as a mediator, so-called primer, between layers which are not compatible with one another, such as decorative printing or decorative layer on the one hand and subsequent wear protection or other finishing layers on the other hand.
- the present method has a variety of advantages.
- an adapted protection and primer system is used depending on the type of further processing.
- a resin preferably a water-compatible resin, a radiation-curable, typically non-water-compatible lacquer, or else polyurethanes which have good adhesion properties can be applied directly to the digital printing.
- After hardening or setting the protective layer intermediate storage of the printed plates is possible without risk of surface damage or contamination of the decorative layer.
- no problems, such as bonding of plates or abrasion and / or detachment of the decoration can be expected. This also ensures that in the event of a business interruption in further processing, the digital printer does not have to stop his work.
- the present method opens up the possibility of serving the various finishing systems, so that digital printing can be used for a wider range of products, e.g. lacquered furniture fronts, laminate flooring, facade panels.
- a water-compatible resin can be used as a protective layer on water-based inks, since as a finishing layer or wear layer usually a coating of an aminoplast resin, such as a melamine-formaldehyde resin, should be provided.
- an aminoplast resin such as a melamine-formaldehyde resin
- radiation-curable coatings may also be planned as a finishing layer or wearing course in the above-mentioned applications for indoor use. In such a case, the use of a radiation-curable varnish as a protective layer would be useful.
- primer / protective layers can also be used. This depends on the further refining steps and materials to be applied to the print.
- latex or solvent inks can be used.
- primer / protective layer transport / storage without damage or loss of quality can be ensured.
- a coating of "any" materials to achieve desired performance properties is possible.
- At least one primer layer comprising at least one resin and / or at least one varnish which is subsequently dried and / or cured is applied to the side of the wood-based panel to be printed prior to printing.
- an aqueous resin solution and / or a radiation-curable putty is preferably used for the primer on the side of the wood-based panel to be printed.
- an aqueous formaldehyde-containing resin solution especially an aqueous solution of a melamine-formaldehyde resin, urea-formaldehyde resin or melamine-urea-formaldehyde resin can be used.
- the amount of liquid resin solution applied to the primer may be between 10 and 80 g / m 2 , preferably 20 and 50 g / m 2 .
- the solids content of the aqueous resin solution is between 30 and 80%, preferably 40 and 60%, particularly preferably 55%.
- the liquid resin may additionally comprise suitable wetting agents, hardeners, release agents and defoamers.
- the liquid resin is brought to a humidity of 10%, preferably 6% e.g. dried in a convection oven or near-infrared oven.
- the wood-based panel can be precoated or primed with UV filler and / or ESH filler.
- a UV filler preferably consists essentially of UV-curable coating components, pigments, reactive diluents and radical formers as chain starters.
- the application rate of the filler may in this case be 50 to 150 g / m 2 , preferably 50 to 100 g / m 2 .
- the quantities are based on a 100% filler.
- the putty used for the primer is pigmented, whereby the printing result can be varied or improved.
- the filler in several layers.
- a hardening of the individual layers by UV or ESH radiation can take place between the jobs, It is also possible to make an intermediate grinding after each job and subsequent curing to improve the surface finish of the side of the wood-based panel to be printed.
- At least one layer of a water-based, pigmented printing ink is applied to the side of the wood-based panel to be printed prior to printing the at least one side of the wood-based panel.
- the ink can either be applied directly to the untreated surface of the material plate or to the primer.
- the water-based pigmented ink may also be applied in more than one layer (e.g., 3 to 10 layers, preferably 5 to 8 layers), with the ink after each coat application e.g. is dried in a convection dryer or a near-infrared dryer.
- a water-based digital printing ink is preferably used for printing the at least one side of the wood-based panel.
- Digital printing can be done using a water-based digital printer Digital printing ink to be executed.
- the amount of digital printing ink used may be between 5 and 10 g / m 2 , preferably 6 and 8 g / m 2 .
- a protective layer comprising at least one resin, at least one radiation-curable lacquer and / or at least one polyurethane is applied to the printed side or decorative layer of the wood-based panel.
- the protective layer to be applied to the decorative layer of the wood-based panel comprises at least one water-compatible resin, preferably a formaldehyde-containing resin, particularly preferably melamine-formaldehyde resin, urea-formaldehyde resin and / or melamine-urea-formaldehyde resin.
- the resin can therefore be applied in liquid form or else in solid form, the use of a liquid resin being preferred.
- the protective layer comprising the at least one water-compatible resin is dried until the resin is still flowable and crosslinkable.
- the drying of the water-compatible resin-containing protective layer is typically carried out in a continuous drying oven, as are known from wood-based panel manufacturing. Depending on the application amount, the drying process may take 5 to 15 seconds, preferably 5 to 10 seconds.
- the protective layer to be applied to the printed side of the wood-based panel or decorative layer comprises at least one radiation-curable lacquer selected from the group of acrylates, modified acrylates and / or epoxides.
- the acrylate is in the form of a substituted or unsubstituted monomer, oligomer and / or polymer, especially in the form of an acrylic, acrylic, and / or acrylic acid ester monomer.
- the polyacrylates may also continue to be functionalized. Suitable functional groups include hydroxy, amino, epoxy and / or carboxyl groups.
- Preferred acrylates are polyester acrylates, polyether acrylates, urethane acrylate, hexanediol diacrylate or mixtures thereof.
- the acrylate compound may be in the form of an emulsion or dispersion and used.
- the acrylate dispersion used can be prepared by mixing the at least one acrylate with water and / or another organic liquid.
- the acrylate paints used in the present case preferably contain no solvents or other auxiliaries and are thus present as 100% systems.
- epoxy resins epoxy resins, epoxy-functional prepolymers, cycloaliphatic epoxides can be used.
- the protective layer to be applied to the printed side of the wood-based panel comprises at least one polyurethane selected from the group consisting of aliphatic urethanes.
- the latter are characterized by a high lightfastness.
- the protective layer to be applied to the printed side of the wood-based panel comprises a mixture of at least one radiation-curable lacquer and at least one polyurethane.
- the polyurethane used in the blend may be considered as a primer to improve the adhesion of the UV varnish to digital printing.
- a primer to improve the adhesion of the UV varnish on the digital printing when using UV varnish as the radiation-curable varnish.
- silanes can also be used as primers.
- the protective layer may be subsequently gelled onto the protective layer using UV radiation (e.g., at 320-400 nm), ESR radiation, and / or NIR radiation.
- UV radiation e.g., at 320-400 nm
- ESR radiation e.g., at 320-400 nm
- NIR radiation e.g., NIR
- the paint preferably has a degree of polymerization between 20-60%, preferably 30-50%.
- the protective layer to be applied to the printed side of the wood-based panel is applied in an amount between 5 and 50 g / m 2 , preferably 8 and 30 g / m 2 , particularly preferably 10 and 20 g / m 2 .
- a first protective layer comprising at least one radiation-curable lacquer and / or at least one polyurethane is first applied to the printed side of the wood-based panel, then annealed and then coated onto the first protective layer comprising at least one radiation-curable lacquer and / or at least one polyurethane at least one second protective layer of at least one water-compatible resin, preferably applied from a formaldehyde-containing resin, and then preferably, as already described, dried.
- the printed wood panel provided with a protective layer is further processed or finished in a short-cycle (KT) press.
- KT short-cycle
- the resin layers are melted and the laminate is cured to a laminate.
- a structured press plate it is also possible to produce surface structures in the surface of the wood-based panel which can optionally be designed to match the décor (so-called decorsynchronous structure).
- the structures may be in the form of pore structures that follow the grain.
- the structures may be depressions in the area of joint fill lines enclosed by the decor.
- step c it is also possible, after drying and / or gelating the protective layer applied to the printed side of the wood-based panel according to step c), to apply at least one further layer comprising abrasion-resistant particles, natural fibers, synthetic fibers and / or further additives, melamine resins, acrylate resins and polyurethane resins can be used as suitable binders.
- the abrasion-resistant particles are preferably selected from the group consisting of aluminum oxides, corundum, boron carbides, silicon dioxides, silicon carbides and glass beads.
- natural and / or synthetic fibers in particular fibers are selected from the group containing wood fibers, cellulose fibers, wool fibers, hemp fibers and organic or inorganic polymer fibers are used.
- conductive substances As additives, conductive substances, flame retardants, luminescent substances and metals may be added.
- the conductive substances may be selected from the group comprising carbon black, carbon fibers, metal powder and nanoparticles, in particular carbon nanotubes. It is also possible to use combinations of these substances come.
- flame retardants phosphates, borates, in particular ammonium polyphosphate, tris (tri-bromneopentyl) phosphate, zinc borate or boric acid complexes of polyhydric alcohols are preferably used.
- luminescent substances are preferably fluorescent and / or phosphorescent substances on an inorganic or organic basis, in particular zinc sulfide and alkaline earth aluminates.
- the wood-based panel to be printed may consist of a wood-based material or of plastic or a wood-material-plastic mixture.
- chipboard medium density fiber (MDF), high density fiber (HDF) or coarse chip (OSB) or plywood boards, a cement fiber board and / or gypsum fiberboard are used.
- the protective layer of the present wood-based panel is composed of at least one first protective layer comprising at least one radiation-curable lacquer and / or at least one polyurethane and a second protective layer comprising at least one resin applied to the first protective layer.
- the printed wood-based panel may additionally have a coating applied to the at least one protective layer, abrasion-resistant particles, natural fibers, synthetic fibers and / or other additives comprising layer.
- the wood-based panel may have at least one Gegenzugsbe slaughterung and / or a sound-absorbing layer.
- FIG. 1 shows the cross section of a printed by the present method wood-based panel.
- a primer layer 2 of an aqueous resin solution or a curable putty was first applied to remove unevenness in the surface of the wood-based panel and to provide an improved surface for subsequent digital printing.
- the decorative layer 3 is then printed on the primer layer 2, which is then provided with a protective layer 4 made of a water-compatible resin or a radiation-curable lacquer.
- a protective layer 4 made of a water-compatible resin or a radiation-curable lacquer.
- the protective layer 4 it is also possible for the protective layer 4 to be composed of a first partial layer 4a in the form of a radiation-curable lacquer and a second partial layer 4b in the form of a water-compatible resin, which have been successively applied to the decorative layer 3 with intermediate drying.
- the protective layer 4 is followed by a wear layer 5, which consists of a binder and abrasion-resistant particles.
- An HDF board (fiberboard with increased bulk density) is first precoated with an aqueous resin (melamine-formaldehyde resin).
- the application rate is 20-50 g of resin liquid / m 2 (solids content: about 55%).
- the resin contains the usual auxiliaries such as wetting agents, hardeners, release agents and defoamers.
- the applied resin is dried in a convection dryer or a near-infrared oven to a moisture content of about 6%.
- more layers of a wasse rb are as notorious, pigmented base coat is applied (5-8 x).
- the primer is dried using a convection dryer or a near-infrared dryer.
- the primed plate is printed with a digital printer with a motif. About 6 - 8 g / m 2 water-based digital printing inks are used.
- a layer of melamine-formaldehyde resin is applied and dried as already described above. The drying is done only to the point where the resin is still flowable and crosslinkable. This prevents adhesion of the resin-coated plates.
- the incomplete crosslinking of the synthetic resin also ensures that when applying further liquid or powdery resin layers (eg melamine resin) or resinated papers and subsequent pressing in a KT further processing is possible without a deterioration of the adhesion of the later applied layers he follows.
- the application quantities of the resins liquid, powdered or on paper
- the plates thus treated can be fed to a KT press for further processing.
- the digital printing is applied to a layer based on UV varnishes (1 or 2K) or polyurethane or mixtures thereof, which improves the adhesion to the printing ink and the other layers and serves as a protective layer. Any other primers can also be used.
- the combined protective and primer layer is applied in an amount of 8-30 g of primer / m 2 .
- the primer can be gelled by a UV lamp, an ESH emitter or NIR. Thereafter, the plates are stackable and can be processed later. This can be z. B. by the application of several layers of UV or ESH paints, which prevent the individual wear as a single functional layers or scratching. The thus treated plates can then be fed to a KT press for further processing and refinement
- An HDF board (fiberboard with increased density) is first precoated with a UV or ESH filler.
- the order quantity is 50-100 g of paint / m 2 (100%).
- the UV / ESH filler is pigmented and can be applied in several layers. In each case, a hardening with UV or ESH lamps is carried out between the individual orders. If necessary, an intermediate sanding is carried out after each application / hardening.
- the primed plate is printed with a digital printer with a motif. About 6 - 8 g / m 2 of UV digital printing ink are used.
- a primer based on UV varnishes (1 or 2K) or polyurethane or mixtures thereof is applied, which improves the adhesion to the printing ink and the other layers and serves as a protective layer. Any other primers can also be used.
- the combined protective and primer layer is applied in an amount of 8-30 g of primer / m 2 .
- the primer can be gelled by a UV lamp, an ESH emitter or NIR. Thereafter, the plates are stackable and can be processed later. Subsequently, a layer of melamine-formaldehyde resin is applied and dried as already described above. The drying is done only to the point where the resin is still flowable and crosslinkable.
- the incomplete crosslinking of the synthetic resin ensures that an application of further liquid or powdery resin layers (eg melamine resin) or resinated papers and subsequent pressing in a KT further processing is possible without a deterioration of the adhesion of the subsequently applied layers ,
- the application quantities of the resins can be several hundred grams, depending on the desired structure and structure depth.
- a UV varnish containing a primer that improves the adhesion to the ink and the other layers.
- the primer should also prevent the occurrence of gas bubbles. These often occur when applying a paint directly to the UV ink. Surprisingly, this does not happen after the primer application.
- the combined protective and primer layer is applied in an amount of 8-30 g of primer / m 2 . It may be z. B. may be a primer based on a polyurethane. Any other primers can also be used.
- the paint can be gelled by a UV lamp or an ESH lamp. Thereafter, the plates are stackable and can be processed later. This can be z. B. by the application of several layers of UV or ESH paints, which prevent the individual wear as a single functional layers or scratching. The thus treated plates can then be fed to a KT press for further processing and refinement.
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Abstract
Description
Die vorliegende Erfindung betrifft ein Verfahren zum Bedrucken von Holzwerkstoffplatten nach Anspruch 1 und eine Holzwerkstoffplatte mit aufgedruckter Dekorschicht nach Anspruch 13.The present invention relates to a method for printing wood-based panels according to claim 1 and a wood-based panel with printed decorative layer according to claim 13.
Die Verwendung von Holzwerkstoffplatten in der Möbelindustrie, als Fußbodenbeläge oder auch zum Verkleiden von Wänden und Decken erfordert eine Bearbeitung bzw. Veredelung der Oberfläche der Holzwerkstoffplatten. Üblicherweise werden im Falle der genannten Anwendungsgebiete die Holzwerkstoffplatten mit einem Dekorpapier beschichtet. Der Vielfältigkeit an verschieden gemusterten Dekorpapieren sind keine Grenzen gesetzt, so dass Holzwerkstoffplatten mit einer Vielzahl von unterschiedlichen Dekoren wie z.B. Stein-oder Holzdekoren erhältlich sind.The use of wood-based panels in the furniture industry, as floor coverings or for covering walls and ceilings requires a processing or refinement of the surface of the wood-based panels. Usually, in the case of the aforementioned fields of application, the wood-based panels are coated with decorative paper. There are no limits to the variety of differently patterned decorative papers, so that wood-based panels with a variety of different decors such. Stone or wood decors are available.
Als Alternative zur Verwendung von Dekorpapieren auf Holzwerkstoffplatten hat sich in der Vergangenheit das direkte Bedrucken von Holzwerkstoffplatten entwickelt, da ein Bedrucken von Papier und dessen nachträglichem Kaschieren oder Direktbeschichten auf die Holzwerkstoffplatte entfällt.As an alternative to the use of decorative papers on wood-based panels, the direct printing of wood-based panels has developed in the past, as a printing of paper and its subsequent lamination or direct coating is omitted on the wood-based panel.
Die hierbei hauptsächlich zum Einsatz kommenden Drucktechniken sind das Tiefdruckverfahren und das Digitaldruckverfahren. Das Tiefdruckverfahren ist eine Drucktechnik, bei der die abzubildenden Elemente als Vertiefungen in einer Druckform vorliegen, die vor dem Druck eingefärbt wird. Die Druckfarbe befindet sich vornehmlich in den Vertiefungen und wird aufgrund von Anpressdruck der Druckform und von Adhäsionskräften auf den zu bedruckenden Gegenstand übertragen. Beim Digitaldruck hingegen wird das Druckbild direkt von einem Computer in eine Druckmaschine übertragen wie z.B. Laserdrucker oder Tintenstrahldrucker. Die Verwendung einer statischen Druckform entfällt.The printing techniques mainly used here are gravure printing and digital printing. The gravure printing process is a printing technique in which the elements to be imaged are in the form of depressions in a printing form which is inked before printing. The ink is located primarily in the wells and is transmitted due to contact pressure of the printing plate and adhesive forces on the object to be printed. In digital printing, on the other hand, the print image is transferred directly from a computer to a printing machine, such as a digital press. Laser printer or inkjet printer. The use of a static printing form is eliminated.
Es ist allerdings absehbar, dass die Tiefdruck-Technologie immer stärker von der Digitaldruck-Technologie abgelöst wird. Dies ist unter Kostengesichtspunkten mit der deutlichen Reduzierung der Kosten für Digitaldrucker und Digitaldrucktinten und insbesondere unter technologischen Gesichtspunkten mit der sehr großen Flexibilität und den Gestaltungsmöglichkeiten der Digitaldrucktechnik zu begründen, insbesondere unter Berücksichtigung des Trends immer kleiner werdender Losgrößen.However, it is foreseeable that gravure printing technology will increasingly be replaced by digital printing technology. This is in terms of cost with the significant reduction in the cost of digital printers and digital printing inks, and in particular from a technological point of view with the very great flexibility and to justify the design options of digital printing technology, especially taking into account the trend of ever smaller lot sizes.
Allerdings stehen der vollständigen Umstellung von Tiefdruck auf Digitaldruck noch einige Probleme im Weg.However, there are still some problems in the way of the full transition from gravure to digital.
Zum einen liegt die Produktionsgeschwindigkeit eines Digitaldruckers noch deutlich unter der einer modernen Lackierlinie oder Kurztaktpresse. Diese sind üblicherweise die nächsten Wertschöpfungsstufen nach dem Digitaldruck.On the one hand, the production speed of a digital printer is still significantly below that of a modern paint line or short-cycle press. These are usually the next value creation steps after digital printing.
Zum anderen besteht häufig eine Unverträglichkeit zwischen den verwendeten Digitaldrucktinten, die Wasser basierend, UV-basierend oder Lösemittel basierend ausgeführt sein können, und den anschließend aufzutragenden Schichten zur Versiegelung und zum Verschleißschutz.On the other hand, there is often an incompatibility between the used digital printing inks, which may be water based, UV based or solvent based, and the subsequently applied layers for sealing and wear protection.
Ein weiterer Aspekt ist, dass beim Transport und/oder der Handhabung von Platten mit ungeschützten Dekordrucken auf der Oberseite in einer Fertigungskette mit Verschmutzungen und/oder Beschädigungen des Dekors zu rechnen ist. Dies führt zu Qualitätsminderung, kann jedoch oft erst spät in der Fertigungskette identifiziert werden, so dass hohe Aufwände und Kosten folgen.Another aspect is that during transport and / or handling of plates with unprotected decorative prints on top in a production chain with dirt and / or damage to the decor is to be expected. This leads to quality degradation, but can often be identified late in the production chain, so that high costs and costs follow.
Bei Einsatz der Tiefdrucktechnik bei Holzwerkstoffplatten auf Basis von wässrigen Druckfarben mit anschließender Veredelung durch eine Lackierung stellen sich diese Probleme offensichtlich nicht, da keine Produktivitätsunterschiede zwischen Druck und Lackierung existieren und damit Zwischenlagerungen oder Transporte entfallen.When using the gravure printing technique for wood-based panels based on aqueous printing inks with subsequent finishing by painting, these problems obviously do not arise because there are no differences in productivity between printing and coating and thus no intermediate storage or transport.
Das Problem existiert bereits etwas ausgeprägter bei der Verwendung von im Tiefdruck dekorierten Holzwerkstoffplatten, die anschließend in einer Kurztakt(KT)-Presse mit einem Verschleißschutz beschichtet werden sollen. Hier liegt die Produktivität der Drucklinie bereits deutlich über der der KT-Presse. Damit ist zwingend ein Oberflächenschutz für einen Transport und/oder eine Zwischenlagerung notwendig. Ein solcher Oberflächenschutz wird meist über einen Walzenauftrag aufgebracht und besteht aus einer Rezeptur, die aus einem duromeren Harz, beispielsweise Melaminharz besteht. Dabei treten kaum Haftungsprobleme auf, so dass technologisch kaum Restriktionen bestehen.The problem already exists somewhat more pronounced when using wood-based panels decorated in gravure, which are then to be coated with a wear protection in a short-cycle (KT) press. Here, the productivity of the printing line is already well above that of the KT press. This imperatively requires surface protection for transport and / or intermediate storage. Such a surface protection is usually applied via a roller application and consists of a formulation which consists of a thermosetting resin, for example melamine resin. There are hardly any liability problems, so that technologically there are hardly any restrictions.
Bei einem Digitaldruck stellt sich dies weitaus komplexer und schwieriger dar. Nach dem die Entscheidung für ein Tintensystem gefallen ist (z. B. UV-basierte Digitaldrucktinte) treten neben den oben genannten Produktivitätsrestriktionen besonders Unverträglichkeiten in bestimmten Verarbeitungssträngen auf. So ist bei Verwendung von UV-basierten Digitaldrucktinten eine anschließende Beschichtung mit wässrigen Melaminharzen schwierig, wodurch eine Weiterverarbeitung in einer KT-Presse unter Verwendung dieser duromeren Harze hohe technische Hürden erzeugt.In digital printing, this is far more complex and difficult. After deciding on an ink system (eg, UV-based digital ink), incompatibilities occur in certain processing strands in addition to the above-mentioned productivity constraints. Thus, using UV-based digital printing inks, subsequent coating with aqueous melamine resins is difficult, which means that further processing in a KT press using these thermosetting resins creates high technical hurdles.
Es besteht großer Bedarf an einer technischen Lösung, die die sich an den Druckvorgang anschließenden Verfahrensschritte zur weiteren Bearbeitung bzw. Veredlung von Holzwerkstoffen nicht einschränkt oder erschwert.There is a great need for a technical solution that does not restrict or hinder the process steps subsequent to the printing process for the further processing or refinement of wood-based materials.
Der vorliegenden Erfindung liegt daher die Aufgabe zugrunde, das Digitaldruckverfahren für Holzwerkstoffplatten soweit zu verbessern, so dass Transport und Handhabung dekorierter Platten ohne Qualitätsverluste möglich sind und zugleich Einschränkungen in der Weiterverarbeitung weitgehend überwunden werden.The present invention is therefore based on the object to improve the digital printing process for wood-based panels so far, so that transport and handling decorated panels without quality losses are possible and at the same time restrictions in further processing are largely overcome.
Diese Aufgabe wird erfindungsgemäß durch ein Verfahren mit den Merkmalen des Anspruchs 1 und eine Holzwerkstoffplatte mit den Merkmalen des Anspruchs 13 gelöst.This object is achieved by a method with the features of claim 1 and a wood-based panel with the features of claim 13.
Entsprechend wird ein Verfahren zum Bedrucken einer Holzwerkstoffplatte, insbesondere einer Holzfaserwerkstoffplatte, mittels eines Digitaldruckverfahrens bereitgestellt, welches die folgenden Schritte umfasst:
- a) Bedrucken mindestens einer Seite einer Holzwerkstoffplatte mittels Digitaldrucktechnik unter Ausbildung einer Dekorschicht;
- b) Auftragen einer Schutzschicht enthaltend mindestens ein Harz, mindestens einen strahlenhärtbaren Lack und/oder mindestens ein Polyurethan auf die Dekorschicht bzw. bedruckte Seite der Holzwerkstoffplatte; und
- c) Antrocknen und/oder Angelieren der auf der Dekorschicht der Holzwerkstoffplatte aufgetragenen Schutzschicht.
- a) printing at least one side of a wood-based panel by means of digital printing technology to form a decorative layer;
- b) applying a protective layer containing at least one resin, at least one radiation-curable lacquer and / or at least one polyurethane on the decorative layer or printed side of the wood-based panel; and
- c) drying and / or gelling the protective layer applied to the decorative layer of the wood-based panel.
Entsprechend wird durch das vorliegende Verfahren eine Schutzschicht auf einer digital bedruckten Holzwerkstoffplatte bereitgestellt, die gleichzeitig als Vermittler, so genannter Primer, zwischen an sich nicht verträglichen Schichten, wie dem Dekordruck bzw. der Dekorschicht einerseits und einem nachfolgenden Verschleißschutz oder anderen Veredlungsschichten andererseits angeordnet ist.Accordingly, the present method provides a protective layer on a digitally printed wood-based panel which is at the same time arranged as a mediator, so-called primer, between layers which are not compatible with one another, such as decorative printing or decorative layer on the one hand and subsequent wear protection or other finishing layers on the other hand.
Das vorliegende Verfahren weist eine Vielzahl von Vorteilen auf. So wird je nach Art der Weiterverarbeitung ein daran angepasstes Schutz- und Primersystem verwendet. Auf den Digitaldruck kann vorliegend entweder ein Harz, bevorzugt ein wasserverträgliches Harz, ein strahlenhärtbarer, typischerweise nicht wasserverträglicher Lack oder auch Polyurethane, die über gute Haftungseigenschaften verfügen, unmittelbar aufgetragen werden. Nach Anhärten oder Angelieren der Schutzschicht ist eine Zwischenlagerung der beduckten Platten ohne Gefahr einer Oberflächenverletzung oder Verschmutzung der Dekorschicht möglich. Somit sind selbst bei undefinierten Zeitabständen zwischen einem Bearbeitungsschritt Digitaldekordruck und einem weiter bearbeitenden Schritt keine Probleme, wie Verklebung von Platten oder Abrieb und/oder Ablösung des Dekors zu erwarten. Damit ist auch sichergestellt, dass bei einer Betriebsunterbrechung in der Weiterverarbeitung der Digitaldrucker seine Arbeit nicht einstellen muss.The present method has a variety of advantages. Thus, depending on the type of further processing, an adapted protection and primer system is used. In the present case, either a resin, preferably a water-compatible resin, a radiation-curable, typically non-water-compatible lacquer, or else polyurethanes which have good adhesion properties can be applied directly to the digital printing. After hardening or setting the protective layer, intermediate storage of the printed plates is possible without risk of surface damage or contamination of the decorative layer. Thus, even at undefined time intervals between a processing step digital printing and a further processing step no problems, such as bonding of plates or abrasion and / or detachment of the decoration can be expected. This also ensures that in the event of a business interruption in further processing, the digital printer does not have to stop his work.
Das vorliegende Verfahren eröffnet die Möglichkeit die verschiedenen Weiterveredelungssysteme bedienen zu können, so dass der Digitaldruck für eine breitere Palette an Produkten einsetzbar, z.B. lackierte Möbelfronten, Laminatböden, Fassadenplatten.The present method opens up the possibility of serving the various finishing systems, so that digital printing can be used for a wider range of products, e.g. lacquered furniture fronts, laminate flooring, facade panels.
So kann bei der Herstellung von Produkten für den Innenbereich wie z.B. Möbel, Fußböden, Paneele usw. ein wasserverträgliches Harz als Schutzschicht auf wasserbasierten Tinten eingesetzt werden, da als Veredlungsschicht oder Verschleißschicht meist eine Beschichtung aus einem Aminoplastharz, wie einem Melamin-Formaldehyd-Harz, vorgesehen sein dürfte.Thus, in the manufacture of indoor products such as e.g. Furniture, floors, panels, etc., a water-compatible resin can be used as a protective layer on water-based inks, since as a finishing layer or wear layer usually a coating of an aminoplast resin, such as a melamine-formaldehyde resin, should be provided.
Allerdings können auch bei den oben genannten Anwendungen für den Innenbereich strahlenhärtbare Lackierungen als Veredlungsschicht oder Verschleißschicht geplant sein. In solch einem Fall wäre die Verwendung eines strahlenhärtbaren Lackes als Schutzschicht sinnvoll.However, radiation-curable coatings may also be planned as a finishing layer or wearing course in the above-mentioned applications for indoor use. In such a case, the use of a radiation-curable varnish as a protective layer would be useful.
Bei Außenanwendungen wie z.B. Fassaden, Stadtmöbelierung, Werbeschilder usw. kämen im Schwerpunkt strahlenhärtbare Lacke und Polyurethane auf UV- oder Latextinten zum Einsatz.For outdoor applications, such as Facades, city furniture, advertising signs, etc. would focus on radiation-curable lacquers and polyurethanes on UV or latex inks.
Es können natürlich - je nach Verwendungszweck - auch noch andere Primer-/Schutzschichten zum Einsatz kommen. Dies hängt von den weiteren Veredelungsschritten und Materialen ab, die auf den Druck aufgebracht werden sollen.Of course, depending on the intended use, other primer / protective layers can also be used. This depends on the further refining steps and materials to be applied to the print.
Auch können für bestimmte Anwendungen (z. B. Außenanwendungen) Latex- oder Lösemitteltinten zum Einsatz kommen. Auch hier kann durch geschickte Auswahl der Primer-/Schutzschicht ein Transport/eine Lagerung ohne Beschädigungen oder Qualitätsverlust sichergestellt werden. Weiter wird eine Beschichtung mit "beliebigen" Materialien zur Erzielung von gewünschten Gebrauchseigenschaften ermöglicht.Also, for certain applications (eg outdoor applications) latex or solvent inks can be used. Again, by skillful selection of the primer / protective layer transport / storage without damage or loss of quality can be ensured. Further, a coating of "any" materials to achieve desired performance properties is possible.
In einer Ausführungsform des vorliegenden Verfahrens wird auf die zu bedruckende Seite der Holzwerkstoffplatte vor dem Bedrucken mindestens eine Grundierungsschicht umfassend mindestens ein Harz und/oder mindestens einen Lack aufgetragen, die anschließend angetrocknet und/oder angehärtet wird.In one embodiment of the present method, at least one primer layer comprising at least one resin and / or at least one varnish which is subsequently dried and / or cured is applied to the side of the wood-based panel to be printed prior to printing.
Dabei wird bevorzugterweise zur Grundierung eine wässrige Harzlösung und/oder eine strahlenhärtbare Spachtelmasse auf die zu bedruckende Seite der Holzwerkstoffplatte verwendet.In this case, an aqueous resin solution and / or a radiation-curable putty is preferably used for the primer on the side of the wood-based panel to be printed.
Im Falle der Vorbeschichtung bzw. Grundierung der Holzwerkstoffplatte mit einer wässrigen Harzlösung kann eine wässrige Formaldehyd-haltige Harzlösung, insbesondere eine wässrige Lösung eines Melamin-Formaldehyd-Harzes, Harnstoff-Formaldehyd-Harzes oder Melamin-Harnstoff-Formaldehyd-Harz verwendet werden.In the case of pre-coating the wood-based panel with an aqueous resin solution, an aqueous formaldehyde-containing resin solution, especially an aqueous solution of a melamine-formaldehyde resin, urea-formaldehyde resin or melamine-urea-formaldehyde resin can be used.
Die Auftragsmenge an flüssiger Harzlösung zur Grundierung kann zwischen 10 und 80 g/m2, bevorzugt 20 und 50 g/m2 betragen. Der Feststoffgehalt der wässrigen Harzlösung liegt zwischen 30 und 80%, bevorzugt 40 und 60%, insbesondere bevorzugt bei 55%. Das Flüssigharz kann zusätzlich geeignete Netzmittel, Härter, Trennmittel und Entschäumer aufweisen.The amount of liquid resin solution applied to the primer may be between 10 and 80 g / m 2 , preferably 20 and 50 g / m 2 . The solids content of the aqueous resin solution is between 30 and 80%, preferably 40 and 60%, particularly preferably 55%. The liquid resin may additionally comprise suitable wetting agents, hardeners, release agents and defoamers.
Nach Auftragen der wässrigen Harzlösung auf die Holzwerkstoffplatte zur Vorbeschichtung bzw. Grundierung derselbigen wird das Flüssigharz auf eine Feuchte von 10%, bevorzugt 6% z.B. in einem Konvektionsofen oder Nahinfrarot-Ofen getrocknet.After applying the aqueous resin solution to the wood-based panel for precoating the same, the liquid resin is brought to a humidity of 10%, preferably 6% e.g. dried in a convection oven or near-infrared oven.
In einer anderen Ausführungsform des vorliegenden Verfahrens kann die Holzwerkstoffplatte mit UV-Spachtel und/oder ESH-Spachtel vorbeschichtet bzw. grundiert werden. Eine UV-Spachtelmasse besteht vorteilhafterweise im Wesentlichen aus UV-härtbaren Lackkomponenten, Pigmenten, Reaktivverdünner und Radikalbildnern als Kettenstarter.In another embodiment of the present method, the wood-based panel can be precoated or primed with UV filler and / or ESH filler. A UV filler preferably consists essentially of UV-curable coating components, pigments, reactive diluents and radical formers as chain starters.
Die Auftragsmenge der Spachtelmasse kann in diesem Fall 50 bis 150 g/m2, bevorzugt 50 bis 100 g/m2 betragen. Die Mengenangaben beziehen sich dabei auf eine 100%ige Spachtelmasse.The application rate of the filler may in this case be 50 to 150 g / m 2 , preferably 50 to 100 g / m 2 . The quantities are based on a 100% filler.
Ebenfalls ist es möglich, dass die zur Grundierung verwendete Spachtelmasse pigmentiert vorliegt, wodurch das Druckergebnis variiert oder verbessert werden kann.It is also possible that the putty used for the primer is pigmented, whereby the printing result can be varied or improved.
Auch ist es bevorzugt, die Spachtelmasse in mehreren Schichten aufzutragen. In diesem Fall kann zwischen den Aufträgen ein Anhärten der einzelnen Schichten durch UV- oder ESH-Strahlung erfolgen, Auch ist es möglich, nach jedem Auftrag und folgender Anhärtung einen Zwischenschliff vorzunehmen, um die Oberflächenbeschaffenheit der zu bedruckenden Seite der Holzwerkstoffplatte zu verbessern.It is also preferable to apply the filler in several layers. In this case, a hardening of the individual layers by UV or ESH radiation can take place between the jobs, It is also possible to make an intermediate grinding after each job and subsequent curing to improve the surface finish of the side of the wood-based panel to be printed.
In einer weiteren Ausführungsform des vorliegenden Verfahrens wird vor dem Bedrucken der mindestens einen Seite der Holzwerkstoffplatte mindestens eine Schicht einer wasserbasierten, pigmentierten Druckfarbe auf die zu bedruckende Seite der Holzwerkstoffplatte aufgetragen. Die Druckfarbe kann entweder direkt auf die unbehandelte Oberfläche der Werkstoffplatte oder auch auf die Grundierung aufgetragen werden.In a further embodiment of the present method, at least one layer of a water-based, pigmented printing ink is applied to the side of the wood-based panel to be printed prior to printing the at least one side of the wood-based panel. The ink can either be applied directly to the untreated surface of the material plate or to the primer.
Die wasserbasierte pigmentierte Druckfarbe kann auch in mehr als einer Schicht aufgetragen werden (z.B. 3 bis 10 Schichten, bevorzugt 5 bis 8 Schichten), wobei nach jedem Schichtauftrag die Druckfarbe z.B. in einem Konvektionstrockner oder einem Nahinfrarot-Trockner getrocknet wird.The water-based pigmented ink may also be applied in more than one layer (e.g., 3 to 10 layers, preferably 5 to 8 layers), with the ink after each coat application e.g. is dried in a convection dryer or a near-infrared dryer.
Im sich anschließenden Digitaldruck wird zum Bedrucken der mindestens einen Seite der Holzwerkstoffplatte bevorzugt eine wasserbasierte Digitaldrucktinte verwendet. Der Digitaldruck kann unter Verwendung eines Digitaldruckers mit einer wasserbasierten Digitaldrucktinte ausgeführt werden. Die Menge an verwendeter Digitaldrucktinte kann zwischen 5 und 10 g/m2, bevorzugt 6 und 8 g/m2 betragen.In the subsequent digital printing, a water-based digital printing ink is preferably used for printing the at least one side of the wood-based panel. Digital printing can be done using a water-based digital printer Digital printing ink to be executed. The amount of digital printing ink used may be between 5 and 10 g / m 2 , preferably 6 and 8 g / m 2 .
Wie oben erwähnt, wird auf die bedruckte Seite bzw. Dekorschicht der Holzwerkstoffplatte eine Schutzschicht enthaltend mindestens ein Harz, mindestens einen strahlenhärtbaren Lack und/oder mindestens ein Polyurethan aufgetragen.As mentioned above, a protective layer comprising at least one resin, at least one radiation-curable lacquer and / or at least one polyurethane is applied to the printed side or decorative layer of the wood-based panel.
In einer Ausführungsform umfasst die auf die Dekorschicht der Holzwerkstoffplatte aufzutragende Schutzschicht mindestens ein wasserverträgliches Harz, bevorzugt ein Formaldehyd-haltiges Harz, insbesondere bevorzugt Melamin-Formaldehyd-Harz, Harnstoff-Formaldehyd-Harz und/oder Melamin-Harnstoff-Formaldehyd-Harz. Das Harz kann demnach in flüssiger Form oder aber auch in fester Form aufgetragen werden, wobei die Verwendung eines flüssigen Harzes bevorzugt ist.In one embodiment, the protective layer to be applied to the decorative layer of the wood-based panel comprises at least one water-compatible resin, preferably a formaldehyde-containing resin, particularly preferably melamine-formaldehyde resin, urea-formaldehyde resin and / or melamine-urea-formaldehyde resin. The resin can therefore be applied in liquid form or else in solid form, the use of a liquid resin being preferred.
Im Anschluss wird die das mindestens eine wasserverträgliche Harz umfassende Schutzschicht soweit angetrocknet bis das Harz noch fließfähig und vernetzbar ist. Das Antrocknen der ein wasserverträgliches Harz enthaltenden Schutzschicht erfolgt typischerweise in einem kontinuierlichen Trockenofen, wie diese aus der Holzwerkstoffplatten-Herstellung bekannt sind. In Abhängigkeit von der Auftragsmenge kann der Prozess des Antrocknens 5 bis 15 sec, bevorzugt 5 bis 10 sec dauern.Subsequently, the protective layer comprising the at least one water-compatible resin is dried until the resin is still flowable and crosslinkable. The drying of the water-compatible resin-containing protective layer is typically carried out in a continuous drying oven, as are known from wood-based panel manufacturing. Depending on the application amount, the drying process may take 5 to 15 seconds, preferably 5 to 10 seconds.
In einer anderen Ausführungsform des vorliegenden Verfahrens umfasst die auf die bedruckte Seite der Holzwerkstoffplatte bzw. Dekorschicht aufzutragende Schutzschicht mindestens einen strahlenhärtbaren Lack ausgewählt aus der Gruppe der Acrylate, modifizierte Acrylate und/oder Epoxide.In another embodiment of the present method, the protective layer to be applied to the printed side of the wood-based panel or decorative layer comprises at least one radiation-curable lacquer selected from the group of acrylates, modified acrylates and / or epoxides.
In einer Ausführungsform liegt das Acrylat in Form eines substituierten oder unsubstituierten Monomers, Oligomers und/oder Polymers, insbesondere in Form eines Acrylsäure-, Acrylether- und/oder Acrylsäureester-Monomers vor. Von Bedeutung für das vorliegende Verfahren ist dabei die definitionsgemäße Präsenz einer Doppelbindung bzw. ungesättigten Gruppe im Acrylat-Molekül. Die Polyacrylate können auch weiterhin funktionalisiert vorliegen. Geeignete funktionelle Gruppen sind u.a. Hydroxy-, Amino-, Epoxy- und/oder Carboxylgruppen. Bevorzugte Acrylate sind Polyesteracrylate, Polyetheracrylate, Urethanacrylat, Hexandioldiacrylat oder Gemische davon.In one embodiment, the acrylate is in the form of a substituted or unsubstituted monomer, oligomer and / or polymer, especially in the form of an acrylic, acrylic, and / or acrylic acid ester monomer. Of importance for the present process is the definition of presence of a double bond or unsaturated group in the acrylate molecule. The polyacrylates may also continue to be functionalized. Suitable functional groups include hydroxy, amino, epoxy and / or carboxyl groups. Preferred acrylates are polyester acrylates, polyether acrylates, urethane acrylate, hexanediol diacrylate or mixtures thereof.
Die Acrylatverbindung kann sowohl in Form einer Emulsion oder Dispersion vorliegen und verwendet werden. Die zum Einsatz kommende Acrylat-Dispersion kann durch Mischen des mindestens einen Acrylates mit Wasser und/oder einer weiteren organischen Flüssigkeit hergestellt. Bevorzugterweise enthalten die vorliegend verwendeten Acrylat-Lacke allerdings keine Lösemittel oder andere Hilfsstoffe und liegen somit als 100%-Systeme vor.The acrylate compound may be in the form of an emulsion or dispersion and used. The acrylate dispersion used can be prepared by mixing the at least one acrylate with water and / or another organic liquid. However, the acrylate paints used in the present case preferably contain no solvents or other auxiliaries and are thus present as 100% systems.
Als Epoxid-haltige Lacke können Epoxidharze, epoxyfunktionelle Prepolymere, cycloaliphatische Epoxide verwendet werden.As epoxy-containing paints, epoxy resins, epoxy-functional prepolymers, cycloaliphatic epoxides can be used.
In einer noch weiteren Ausführungsform umfasst die auf die bedruckte Seite der Holzwerkstoffplatte aufzutragende Schutzschicht mindestens ein Polyurethan ausgewählt aus der Gruppe enthaltend aliphatische Urethane. Letztere sind durch eine hohe Lichtechtheit gekennzeichnet.In yet another embodiment, the protective layer to be applied to the printed side of the wood-based panel comprises at least one polyurethane selected from the group consisting of aliphatic urethanes. The latter are characterized by a high lightfastness.
Ebenfalls ist es in einer weiteren Variante des vorliegenden Verfahrens möglich, dass die auf die bedruckte Seite der Holzwerkstoffplatte aufzutragende Schutzschicht eine Mischung aus mindestens einem strahlungshärtbaren Lack und mindestens einem Polyurethan umfasst.It is likewise possible in a further variant of the present method that the protective layer to be applied to the printed side of the wood-based panel comprises a mixture of at least one radiation-curable lacquer and at least one polyurethane.
In solch einem Fall kann das in der Mischung verwendete Polyurethan als Primer zur Verbesserung der Haftung des UV-Lackes auf dem Digitaldruck angesehen werden.In such a case, the polyurethane used in the blend may be considered as a primer to improve the adhesion of the UV varnish to digital printing.
Demnach ist es generell wünschenswert, bei Verwendung von UV-Lack als strahlenhärtbaren Lack demselbigen einen Primer zur Verbesserung der Haftung des UV-Lackes auf dem Digitaldruck zuzufügen. Neben den bereits erwähnten Polyurethanen als Primer können ebenfalls Silane als Primer verwendet werden.Accordingly, it is generally desirable to add a primer to improve the adhesion of the UV varnish on the digital printing when using UV varnish as the radiation-curable varnish. In addition to the already mentioned polyurethanes as primers, silanes can also be used as primers.
Wird ein strahlenhärtbarer Lack als Schutzschicht verwendet, kann das sich dem Auftrag der Schutzschicht anschließende Angelieren der Schutzschicht unter Verwendung von UV-Strahlung (z.B. bei 320-400 nm), ESR-Strahlung und/oder NIR-Strahlung erfolgen. Nach dem Angelieren weist der Lack bevorzugt einen Polymerisationsgrad zwischen 20 - 60%, bevorzugt 30-50% auf.When a radiation-curable varnish is used as a protective layer, the protective layer may be subsequently gelled onto the protective layer using UV radiation (e.g., at 320-400 nm), ESR radiation, and / or NIR radiation. After setting, the paint preferably has a degree of polymerization between 20-60%, preferably 30-50%.
In einer weitergehenden Variante des vorliegenden Verfahrens wird die auf die bedruckte Seite der Holzwerkstoffplatte aufzutragende Schutzschicht in einer Menge zwischen 5 und 50 g/m2, bevorzugt 8 und 30 g/m2, insbesondere bevorzugt 10 und 20 g/m2 aufgetragen.In a further variant of the present method, the protective layer to be applied to the printed side of the wood-based panel is applied in an amount between 5 and 50 g / m 2 , preferably 8 and 30 g / m 2 , particularly preferably 10 and 20 g / m 2 .
In einer anderen Variante des vorliegenden Verfahrens wird zunächst auf die bedruckte Seite der Holzwerkstoffplatte eine erste Schutzschicht umfassend mindestens einen strahlungshärtbaren Lack und/oder mindestens ein Polyurethan aufgetragen, angeliert und anschließend auf die angelierte erste Schutzschicht umfassend mindestens einen strahlungshärtbaren Lack und/oder mindestens ein Polyurethan mindesten eine zweite Schutzschicht aus mindestens einem wasserverträglichen Harz, bevorzugt aus einem Formaldehyd-haltigen Harz aufgetragen, und anschließend bevorzugt, wie bereits beschrieben, angetrocknet.In another variant of the present method, a first protective layer comprising at least one radiation-curable lacquer and / or at least one polyurethane is first applied to the printed side of the wood-based panel, then annealed and then coated onto the first protective layer comprising at least one radiation-curable lacquer and / or at least one polyurethane at least one second protective layer of at least one water-compatible resin, preferably applied from a formaldehyde-containing resin, and then preferably, as already described, dried.
In einer weiteren Ausführungsform des vorliegenden Verfahrens wird die bedruckte und mit einer Schutzschicht versehene Holzwerkstoffplatte in einer Kurztakt (KT)-Presse weiterbearbeitet bzw. veredelt. In der KT-Presse werden die Harzschichten aufgeschmolzen und der Schichtverbund zu einem Laminat ausgehärtet. Während der Weiterverarbeitung in der KT-Presse können unter Verwendung eines strukturiertes Pressblech auch Oberflächenstrukturen in der Oberfläche der Holzwerkstoffplatte erzeugt werden, die optional auf das Dekor abgestimmt ausgeführt sein können (so genannte dekorsynchrone Struktur). Bei Holzdekoren können die Strukturen in Form von Porenstrukturen vorliegen, die der Maserung folgen. Bei Fliesendekoren können die Strukturen Vertiefungen im Bereich von dem Dekor umfasster Fugenfüllungslinien sein.In a further embodiment of the present method, the printed wood panel provided with a protective layer is further processed or finished in a short-cycle (KT) press. In the KT press, the resin layers are melted and the laminate is cured to a laminate. During further processing in the KT press, using a structured press plate, it is also possible to produce surface structures in the surface of the wood-based panel which can optionally be designed to match the décor (so-called decorsynchronous structure). For wood decors, the structures may be in the form of pore structures that follow the grain. For tile decors, the structures may be depressions in the area of joint fill lines enclosed by the decor.
Es ist ebenfalls möglich, nach Antrocknen und/oder Angelieren der auf die bedruckte Seite der Holzwerkstoffplatte aufgetragenen Schutzschicht gemäß Schritt c) mindestens eine weitere Schicht umfassend abriebfeste Partikel, natürliche Fasern, synthetische Fasern und/oder weitere Additive aufzutragen, wobei Melaminharze, Acrylatharze und Polyurethanharze als geeignete Bindemittel zum Einsatz kommen können.It is also possible, after drying and / or gelating the protective layer applied to the printed side of the wood-based panel according to step c), to apply at least one further layer comprising abrasion-resistant particles, natural fibers, synthetic fibers and / or further additives, melamine resins, acrylate resins and polyurethane resins can be used as suitable binders.
Die abriebfesten Partikel sind bevorzugt ausgewählt aus der Gruppe enthaltend Aluminiumoxide, Korund, Borcarbide, Siliziumdioxide, Siliziumcarbide und Glaskugeln. Als natürliche und/oder synthetische Fasern kommen insbesondere Fasern ausgewählt sind aus der Gruppe enthaltend Holzfasern, Zellulosefasern, Wollfasern, Hanffasern und organische oder anorganische Polymerfasern zum Einsatz.The abrasion-resistant particles are preferably selected from the group consisting of aluminum oxides, corundum, boron carbides, silicon dioxides, silicon carbides and glass beads. As natural and / or synthetic fibers in particular fibers are selected from the group containing wood fibers, cellulose fibers, wool fibers, hemp fibers and organic or inorganic polymer fibers are used.
Als Additive können leitfähige Substanzen, Flammschutzmittel, luminiszierende Stoffe und Metalle zugegeben werden. Dabei können die leitfähigen Substanzen ausgewählt sein aus der Gruppe enthaltend Russ, Kohlefasern, Metallpulver und Nanopartikel, insbesondere Kohlenstoffnanoröhren. Es können auch Kombinationen dieser Substanzen zum Einsatz kommen. Als Flammschutzmittel werden bevorzugt Phosphate, Borate, insbesondere Ammoniumpolyphosphat, Tris(tri-bromneopentyl)phosphat, Zinkborat oder Borsäurekomplexe von mehrwertigen Alkoholen verwendet. Als luminiszierende Stoffe werden bevorzugt fluoreszierende und/oder phosphoreszierende Stoffe auf anorganischer oder organischer Basis, insbesondere Zinksulfid und Erdalkalialuminate.As additives, conductive substances, flame retardants, luminescent substances and metals may be added. In this case, the conductive substances may be selected from the group comprising carbon black, carbon fibers, metal powder and nanoparticles, in particular carbon nanotubes. It is also possible to use combinations of these substances come. As flame retardants phosphates, borates, in particular ammonium polyphosphate, tris (tri-bromneopentyl) phosphate, zinc borate or boric acid complexes of polyhydric alcohols are preferably used. As luminescent substances are preferably fluorescent and / or phosphorescent substances on an inorganic or organic basis, in particular zinc sulfide and alkaline earth aluminates.
Prinzipiell kann die zu bedruckende Holzwerkstoffplatte aus einem Holzwerkstoff oder aus Kunststoff oder einem Holzwerkstoff-Kunststoff-Gemisch bestehen. Bevorzugterweise kommen Span-, mitteldichte Faser (MDF)-, hochdichte Faser (HDF)- oder Grobspan (OSB)-oder Sperrholzplatten, eine Zementfaserplatte und/oder Gipsfaserplatte zum Einsatz..In principle, the wood-based panel to be printed may consist of a wood-based material or of plastic or a wood-material-plastic mixture. Preferably, chipboard, medium density fiber (MDF), high density fiber (HDF) or coarse chip (OSB) or plywood boards, a cement fiber board and / or gypsum fiberboard are used.
Das vorliegende Verfahren ermöglicht die Herstellung einer Holzwerkstoffplatte mit folgendem Aufbau
- opt. mindestens eine Grundierungsschicht auf mindestens einer Seite der Holzwerkstoffplatte;
- mindestens eine auf der Grundierungsschicht mittels Digitaldruck aufgebrachte Dekorschicht; und
- mindestens eine auf die Dekorschicht aufgebrachte Schutzschicht (4) enthaltend mindestens ein Harz, mindestens einen strahlenhärtbaren Lack und/oder mindestens ein Polyurethan.
- opt. at least one primer layer on at least one side of the wood-based panel;
- at least one decorative layer applied to the primer layer by digital printing; and
- at least one protective layer (4) applied to the decorative layer containing at least one resin, at least one radiation-curable lacquer and / or at least one polyurethane.
In einer Variante setzt sich die Schutzschicht der vorliegenden Holzwerkstoffplatte aus mindestens einer ersten Schutzschicht umfassend mindestens einen strahlenhärtbaren Lack und/oder mindestens ein Polyurethan und eine auf der ersten Schutzschicht aufgetragenen zweiten Schutzschicht umfassend mindestens ein Harz zusammen.In one variant, the protective layer of the present wood-based panel is composed of at least one first protective layer comprising at least one radiation-curable lacquer and / or at least one polyurethane and a second protective layer comprising at least one resin applied to the first protective layer.
Nach einem sich anschließenden Veredlungsprozess der bedruckten Holzwerkstoffplatte kann diese zusätzlich eine auf der mindestens einen Schutzschicht aufgetragene, abriebfeste Partikel, natürliche Fasern, synthetische Fasern und/oder weitere Additive umfassende Schicht aufweisen.After a subsequent refining process of the printed wood-based panel, it may additionally have a coating applied to the at least one protective layer, abrasion-resistant particles, natural fibers, synthetic fibers and / or other additives comprising layer.
Gegenüberliegend zu der bedruckenden Seite, d.h. auf der Rückseite, kann die Holzwerkstoffplatte mindestens eine Gegenzugsbeschichtung und/oder eine schalldämmende Schicht aufweisen.Opposite to the printing side, ie on the back, the wood-based panel may have at least one Gegenzugsbeschichtung and / or a sound-absorbing layer.
Die Erfindung wird nachfolgend unter Bezugnahme auf die Figuren der Zeichnungen an mehreren Ausführungsbeispielen näher erläutert. Es zeigt:
- Figur 1
- perspektivische Ansicht eines Querschnitts einer bedruckten Holzwerkstoffplatte gemäß einer Ausführungsform.
- FIG. 1
- perspective view of a cross section of a printed wood-based panel according to one embodiment.
Auf die Grundierungsschicht 2 wird dann die Dekorschicht 3 aufgedruckt, welche anschließend mit einer Schutzschicht 4 aus einem wasserverträglichen Harz oder einem strahlenhärtbaren Lack versehen wird. Generell ist es auch möglich, dass sich die Schutzschicht 4 aus einer ersten Teilschicht 4a in Form eines strahlenhärtbaren Lackes und einer zweiten Teilschicht 4b in Form eines wasserverträglichen Harzes zusammensetzt, die nacheinander mit Zwischentrocknung auf die Dekorschicht 3 aufgebracht wurden.The
An die Schutzschicht 4 schließt sich eine Verschleißschicht 5 an, die aus einem Bindemittel und abriebfesten Partikeln besteht.The
Eine HDF-Platte ( Faserplatte mit erhöhter Rohdichte ) wird zunächst mit einem wässrigen Kunstharz ( Melamin-Formaldehyd-Harz ) vorbeschichtet. Dabei liegt die Auftragsmenge bei 20 - 50 g Harz flüssig/m2 (Feststoffgehalt: ca. 55%). Das Harz enthält die üblichen Hilfsstoffe wie Netzmittel, Härter, Trennmittel und Entschäumer. Danach wird das aufgetragene Harz in einem Konvektionstrocker oder einem Nahinfrarot-Ofen auf eine Feuchte von ca. 6% getrocknet. Dann werden mehrere Schichten einer wasserbasierten, pigmentierten Grundierung aufgetragen (5 - 8 x). Nach jedem Auftrag wird die Grundierung mit Hilfe von einem Konvektionstrockner oder einem Nahinfrarot-Trockner getrocknet. Im Folgenden wird die grundierte Platte mit einem Digitaldrucker mit einem Motiv bedruckt. Dabei werden ca. 6 - 8 g/m2 wasserbasierte Digitaldrucktinte verwendet.An HDF board (fiberboard with increased bulk density) is first precoated with an aqueous resin (melamine-formaldehyde resin). The application rate is 20-50 g of resin liquid / m 2 (solids content: about 55%). The resin contains the usual auxiliaries such as wetting agents, hardeners, release agents and defoamers. Thereafter, the applied resin is dried in a convection dryer or a near-infrared oven to a moisture content of about 6%. Then more layers of a wasse rb are asierten, pigmented base coat is applied (5-8 x). After each application, the primer is dried using a convection dryer or a near-infrared dryer. In the following, the primed plate is printed with a digital printer with a motif. About 6 - 8 g / m 2 water-based digital printing inks are used.
Anschließend wird eine Schicht Melamin-Formaldehyd-Harz aufgetragen und wie bereits oben beschrieben getrocknet. Die Trocknung wird nur bis zu dem Punkt vorgenommen an dem das Harz noch fließfähig und vernetzbar ist. Dadurch wird eine Verklebung der harzbeschichteten Platten verhindert. Durch das nichtvollständige Vernetzen des Kunstharzes wird auch sichergestellt, dass beim Auftrag von weiteren flüssigen oder pulverförmigen Harzschichten (z. B. Melaminharz) oder beharzten Papieren und anschließendem Verpressen in einer KT-Weiterverarbeitung möglich ist, ohne dass eine Verschlechterung der Haftung der später aufgebrachten Schichten erfolgt. Die Auftragsmengen der Harze (flüssig, pulverförmig oder auf Papier) können dabei je nach gewünschter Struktur und Strukturtiefe durchaus mehrere hundert Gramm betragen. Wie erwähnt, können die so behandelten Platten einer KT-Presse zur weiteren Bearbeitung zugeführt werden.Subsequently, a layer of melamine-formaldehyde resin is applied and dried as already described above. The drying is done only to the point where the resin is still flowable and crosslinkable. This prevents adhesion of the resin-coated plates. The incomplete crosslinking of the synthetic resin also ensures that when applying further liquid or powdery resin layers (eg melamine resin) or resinated papers and subsequent pressing in a KT further processing is possible without a deterioration of the adhesion of the later applied layers he follows. The application quantities of the resins (liquid, powdered or on paper) can be several hundred grams, depending on the desired structure and structure depth. As mentioned, the plates thus treated can be fed to a KT press for further processing.
Auf den Digitaldruck wird eine Schicht auf Basis von UV-Lacken ( 1- oder 2K ) oder Polyurethan oder Gemischen davon aufgetragen, wodurch die Haftung zur Druckfarbe und zu den weiteren Schichten verbessert wird und die als Schutzschicht dient. Beliebige andere Primer können aber ebenfalls eingesetzt werden. Die kombinierte Schutz- und Primerschicht wird dabei in einer Menge von 8 - 30 g Primer/m2 appliziert. Der Primer kann durch eine UV-Lampe, einen ESH-Strahler oder NIR angeliert werden. Danach sind die Platten stapelfähig und können später weiterverarbeitet werden. Dies kann z. B. durch den Auftrag mehrerer Schichten von UV- oder ESH-Lacken erfolgen, die als einzelne Funktionsschichten die Verschleißneigung oder das Verkratzen verhindern. Die so behandelten Platten können anschließend einer KT-Presse zur weiteren Bearbeitung und Veredelung zugeführt werdenThe digital printing is applied to a layer based on UV varnishes (1 or 2K) or polyurethane or mixtures thereof, which improves the adhesion to the printing ink and the other layers and serves as a protective layer. Any other primers can also be used. The combined protective and primer layer is applied in an amount of 8-30 g of primer / m 2 . The primer can be gelled by a UV lamp, an ESH emitter or NIR. Thereafter, the plates are stackable and can be processed later. This can be z. B. by the application of several layers of UV or ESH paints, which prevent the individual wear as a single functional layers or scratching. The thus treated plates can then be fed to a KT press for further processing and refinement
Eine HDF-Platte (Faserplatte mit erhöhter Rohdichte) wird zunächst mit einem UV-oder ESH-Spachtel vorbeschichtet. Dabei liegt die Auftragsmenge bei 50 - 100 g Lack /m2 (100%). Der UV-/ESH-Spachtel ist pigmentiert und kann in mehreren Schichten aufgetragen werden. Zwischen den einzelnen Aufträgen wird jeweils eine Anhärtung mit Hilfe von UV-oder ESH-Strahlern durchgeführt. Bei Bedarf erfolgt nach jedem Auftrag/Anhärtung ein Zwischenschliff. Im Folgenden wird die grundierte Platte mit einem Digitaldrucker mit einem Motiv bedruckt. Dabei werden ca. 6 - 8 g/m2 UV-Digitaldrucktinte verwendet.An HDF board (fiberboard with increased density) is first precoated with a UV or ESH filler. The order quantity is 50-100 g of paint / m 2 (100%). The UV / ESH filler is pigmented and can be applied in several layers. In each case, a hardening with UV or ESH lamps is carried out between the individual orders. If necessary, an intermediate sanding is carried out after each application / hardening. In the following, the primed plate is printed with a digital printer with a motif. About 6 - 8 g / m 2 of UV digital printing ink are used.
Auf den Digitaldruck wird ein Primer auf Basis von UV-Lacken ( 1- oder 2K ) oder Polyurethan oder Gemischen davon aufgetragen, der die Haftung zur Druckfarbe und zu den weiteren Schichten verbessert und als Schutzschicht dient. Beliebige andere Primer können aber ebenfalls eingesetzt werden. Die kombinierte Schutz- und Primerschicht wird dabei in einer Menge von 8 - 30 g Primer/m2 appliziert. Der Primer kann durch eine UV-Lampe, einen ESH-Strahler oder NIR angeliert werden. Danach sind die Platten stapelfähig und können später weiterverarbeitet werden. Anschließend wird eine Schicht Melamin-Formaldehyd-Harz aufgetragen und wie bereits oben beschrieben getrocknet. Die Trocknung wird nur bis zu dem Punkt vorgenommen an dem das Harz noch fließfähig und vernetzbar ist. Durch das nichtvollständige Vernetzen des Kunstharzes wird sichergestellt, dass ein Auftrag von weiteren flüssigen oder pulverförmigen Harzschichten ( z. B. Melaminharz ) oder beharzten Papieren und anschließendem Verpressen in einer KT-Weiterverarbeitung möglich ist, ohne das eine Verschlechterung der Haftung der später aufgebrachten Schichten erfolgt. Die Auftragsmengen der Harze (flüssig, pulverförmig oder auf Papier) können dabei je nach gewünschter Struktur und Strukturtiefe durchaus mehrere hundert Gramm betragen.For digital printing, a primer based on UV varnishes (1 or 2K) or polyurethane or mixtures thereof is applied, which improves the adhesion to the printing ink and the other layers and serves as a protective layer. Any other primers can also be used. The combined protective and primer layer is applied in an amount of 8-30 g of primer / m 2 . The primer can be gelled by a UV lamp, an ESH emitter or NIR. Thereafter, the plates are stackable and can be processed later. Subsequently, a layer of melamine-formaldehyde resin is applied and dried as already described above. The drying is done only to the point where the resin is still flowable and crosslinkable. The incomplete crosslinking of the synthetic resin ensures that an application of further liquid or powdery resin layers (eg melamine resin) or resinated papers and subsequent pressing in a KT further processing is possible without a deterioration of the adhesion of the subsequently applied layers , The application quantities of the resins (liquid, powdered or on paper) can be several hundred grams, depending on the desired structure and structure depth.
Auf den Digitaldruck wird z. B. ein UV-Lack aufgetragen, der einen Primer enthält, der die Haftung zur Druckfarbe und zu den weiteren Schichten verbessert. Außerdem soll der Primer auch das Auftreten von Gasbläschen verhindern. Diese treten häufig beim direkten Auftrag eines Lackes auf die UV-Tinte auf. Überraschenderweise passiert dies nach dem Primerauftrag nicht mehr. Die kombinierte Schutz- und Primerschicht wird dabei in einer Menge von 8 - 30 g Primer/m2 appliziert. Dabei kann es sich z. B. um einen Primer auf Basis eines Polyurethans handeln. Beliebige andere Primer können aber ebenfalls eingesetzt werden. Der Lack kann durch eine UV-Lampe oder einen ESH-Strahler angeliert werden. Danach sind die Platten stapelfähig und können später weiterverarbeitet werden. Dies kann z. B. durch den Auftrag mehrerer Schichten von UV- oder ESH-Lacken erfolgen, die als einzelne Funktionsschichten die Verschleißneigung oder das Verkratzen verhindern. Die so behandelten Platten können anschließend einer KT-Presse zur weiteren Bearbeitung und Veredelung zugeführt werden.On the digital printing z. B. applied a UV varnish containing a primer that improves the adhesion to the ink and the other layers. In addition, the primer should also prevent the occurrence of gas bubbles. These often occur when applying a paint directly to the UV ink. Surprisingly, this does not happen after the primer application. The combined protective and primer layer is applied in an amount of 8-30 g of primer / m 2 . It may be z. B. may be a primer based on a polyurethane. Any other primers can also be used. The paint can be gelled by a UV lamp or an ESH lamp. Thereafter, the plates are stackable and can be processed later. This can be z. B. by the application of several layers of UV or ESH paints, which prevent the individual wear as a single functional layers or scratching. The thus treated plates can then be fed to a KT press for further processing and refinement.
Claims (15)
umfassend die Schritte
comprising the steps
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PL13158397T PL2774770T3 (en) | 2013-03-08 | 2013-03-08 | Method for printing a wood fibre panel and wood fibre panel with a printed decorative layer |
| EP13158397.3A EP2774770B1 (en) | 2013-03-08 | 2013-03-08 | Method for printing a wood fibre panel and wood fibre panel with a printed decorative layer |
| PT131583973T PT2774770E (en) | 2013-03-08 | 2013-03-08 | Method for printing a wood fibre panel and wood fibre panel with a printed decorative layer |
| ES13158397.3T ES2542977T3 (en) | 2013-03-08 | 2013-03-08 | Procedure for printing a wood material plate and wood material plate with a printed decorative layer |
| RU2014108004A RU2612823C2 (en) | 2013-03-08 | 2014-03-04 | Method of printed pattern application on particleboard and particleboard with printed decorative layer |
| US14/200,588 US9931667B2 (en) | 2013-03-08 | 2014-03-07 | Method for printing a wood material board and wood material board with printed decorative layer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP13158397.3A EP2774770B1 (en) | 2013-03-08 | 2013-03-08 | Method for printing a wood fibre panel and wood fibre panel with a printed decorative layer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2774770A1 true EP2774770A1 (en) | 2014-09-10 |
| EP2774770B1 EP2774770B1 (en) | 2015-04-29 |
Family
ID=47843141
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP13158397.3A Active EP2774770B1 (en) | 2013-03-08 | 2013-03-08 | Method for printing a wood fibre panel and wood fibre panel with a printed decorative layer |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US9931667B2 (en) |
| EP (1) | EP2774770B1 (en) |
| ES (1) | ES2542977T3 (en) |
| PL (1) | PL2774770T3 (en) |
| PT (1) | PT2774770E (en) |
| RU (1) | RU2612823C2 (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3070120A1 (en) * | 2015-03-20 | 2016-09-21 | Sumitomo Rubber Industries, Ltd. | Polymer composite and method for producing the same, and rubber composition for tires and pneumatic tire |
| EP3231519A1 (en) * | 2016-04-12 | 2017-10-18 | Flooring Technologies Ltd. | Composite wood board with modified resin layer and method for the manufacture thereof |
| EP3178652B1 (en) | 2015-12-07 | 2018-06-06 | Akzenta Paneele + Profile GmbH | Decorative panel and method for manufacturing same |
| EP3757178A1 (en) | 2019-06-25 | 2020-12-30 | Flooring Technologies Ltd. | Production method for at least one material with printed decorative element |
| RU2767202C1 (en) * | 2019-01-22 | 2022-03-16 | Флуринг Текнолоджис Лтд. | Method for manufacturing a wear-resistant plate based on a wood material |
| EP3231568B1 (en) * | 2016-04-12 | 2023-06-07 | SWISS KRONO Tec AG | Method for applying a film or a sheet on a composite wood board |
Families Citing this family (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11235565B2 (en) | 2008-04-07 | 2022-02-01 | Valinge Innovation Ab | Wood fibre based panels with a thin surface layer |
| EP2676794B1 (en) * | 2009-06-17 | 2018-09-05 | Välinge Innovation AB | Method for manufacturing a panel and a prepreg |
| UA106783C2 (en) | 2010-01-15 | 2014-10-10 | Велінге Інновейшн Аб | Method to produce wear resistant surface layer (options) and flooring produced this way |
| US10899166B2 (en) | 2010-04-13 | 2021-01-26 | Valinge Innovation Ab | Digitally injected designs in powder surfaces |
| US8480841B2 (en) | 2010-04-13 | 2013-07-09 | Ceralog Innovation Belgium BVBA | Powder overlay |
| PL2697076T3 (en) | 2011-04-12 | 2020-07-27 | Välinge Innovation AB | Method of manufacturing a layer |
| KR101969818B1 (en) | 2011-08-26 | 2019-04-17 | 세라록 이노베이션 에이비 | Panel coating |
| US8993049B2 (en) | 2012-08-09 | 2015-03-31 | Valinge Flooring Technology Ab | Single layer scattering of powder surfaces |
| UA118967C2 (en) | 2013-07-02 | 2019-04-10 | Велінге Інновейшн Аб | A method of manufacturing a building panel and a building panel |
| EP2860037B1 (en) | 2013-10-08 | 2015-12-23 | Flooring Technologies Ltd. | Method for adapting decorative prints and device for carrying out said method |
| PL2937221T3 (en) * | 2014-04-24 | 2017-01-31 | Flooring Technologies Ltd. | Method for adapting decorative prints and device for carrying out said method |
| PL3246175T3 (en) | 2016-05-20 | 2019-03-29 | Flooring Technologies Ltd | Method of producing an abrasion resistant wooden panel and production line for same |
| US10814601B2 (en) * | 2017-05-23 | 2020-10-27 | Valinge Innovation Ab | Method to produce a coating layer, a building panel and a coated foil |
| PT3480030T (en) | 2017-11-06 | 2020-07-21 | Flooring Technologies Ltd | Method of producing an abrasion resistant wood-based panel and production line for same |
| WO2020079038A1 (en) * | 2018-10-17 | 2020-04-23 | Agfa Nv | Method of color mapping of oligochromatic patterns |
| US10913092B2 (en) | 2018-11-21 | 2021-02-09 | Mr. Bar-B-Q Products Llc | Systems and methods of UV printing on substrates |
| ES2925714T3 (en) | 2020-02-11 | 2022-10-19 | Flooring Technologies Ltd | Process for the manufacture of at least one support material provided with a printed decoration |
| CN112140679B (en) * | 2020-09-08 | 2021-07-06 | 江苏博大新材料科技股份有限公司 | High-impact-resistance type A-level non-combustible high-pressure decorative plate and preparation method thereof |
| ES2959015T3 (en) | 2021-05-25 | 2024-02-19 | Flooring Technologies Ltd | Procedure for the production of an abrasion-resistant laminate material |
| EP4177059A1 (en) | 2021-11-08 | 2023-05-10 | Flooring Technologies Ltd. | Method for determining a colour deviation of at least one printing pattern applied to a carrier material from a printing template |
Citations (4)
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| US20040086678A1 (en) * | 2002-11-01 | 2004-05-06 | Chen Hao A. | Surface covering panel |
| WO2006031951A1 (en) * | 2004-09-15 | 2006-03-23 | Masonite Corporation | Method and apparatus for creating an image on an article, and article resulting therefrom |
| EP1872959A1 (en) * | 2006-06-26 | 2008-01-02 | Dante Frati | Process for printing surfaces of wood-based flat elements |
| WO2011020755A1 (en) * | 2009-08-19 | 2011-02-24 | Theodor Hymmen Holding Gmbh | Method and device for producing a printed surface on a flat workpiece |
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| WO2002004207A1 (en) * | 2000-07-11 | 2002-01-17 | Pergo Ab | A process for the manufacturing of an improved decorative laminate and a decorative laminate obtained by the process |
| KR100451482B1 (en) * | 2002-04-24 | 2004-10-11 | 우진물산 주식회사 | Floors made from phenol composite resin |
| US6913819B2 (en) * | 2002-12-27 | 2005-07-05 | Christine E. Wallner | Cementitious veneer and laminate material |
| US7678425B2 (en) * | 2003-03-06 | 2010-03-16 | Flooring Technologies Ltd. | Process for finishing a wooden board and wooden board produced by the process |
| US20080241399A1 (en) * | 2007-03-30 | 2008-10-02 | Skyline Steel, Llc. | Method of coating and coated sheet piling sections |
| PL2314462T3 (en) | 2009-10-21 | 2013-04-30 | Falquon Gmbh | Method of manufacturing a cement-bound board with a printed decorative layer |
| PL2484539T3 (en) | 2011-02-07 | 2017-06-30 | Flooring Technologies Ltd. | Paper for coating a surface and method for attaching a finish to a wooden material board |
-
2013
- 2013-03-08 PT PT131583973T patent/PT2774770E/en unknown
- 2013-03-08 EP EP13158397.3A patent/EP2774770B1/en active Active
- 2013-03-08 ES ES13158397.3T patent/ES2542977T3/en active Active
- 2013-03-08 PL PL13158397T patent/PL2774770T3/en unknown
-
2014
- 2014-03-04 RU RU2014108004A patent/RU2612823C2/en not_active Application Discontinuation
- 2014-03-07 US US14/200,588 patent/US9931667B2/en active Active
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| US20040086678A1 (en) * | 2002-11-01 | 2004-05-06 | Chen Hao A. | Surface covering panel |
| WO2006031951A1 (en) * | 2004-09-15 | 2006-03-23 | Masonite Corporation | Method and apparatus for creating an image on an article, and article resulting therefrom |
| EP1872959A1 (en) * | 2006-06-26 | 2008-01-02 | Dante Frati | Process for printing surfaces of wood-based flat elements |
| WO2011020755A1 (en) * | 2009-08-19 | 2011-02-24 | Theodor Hymmen Holding Gmbh | Method and device for producing a printed surface on a flat workpiece |
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| "A method of manufacturing a panel", IP.COM JOURNAL, IP.COM INC., WEST HENRIETTA, NY, US, 24 September 2012 (2012-09-24), XP013154152, ISSN: 1533-0001 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3070120A1 (en) * | 2015-03-20 | 2016-09-21 | Sumitomo Rubber Industries, Ltd. | Polymer composite and method for producing the same, and rubber composition for tires and pneumatic tire |
| EP3178652B1 (en) | 2015-12-07 | 2018-06-06 | Akzenta Paneele + Profile GmbH | Decorative panel and method for manufacturing same |
| EP3231519A1 (en) * | 2016-04-12 | 2017-10-18 | Flooring Technologies Ltd. | Composite wood board with modified resin layer and method for the manufacture thereof |
| EP3231568B1 (en) * | 2016-04-12 | 2023-06-07 | SWISS KRONO Tec AG | Method for applying a film or a sheet on a composite wood board |
| RU2767202C1 (en) * | 2019-01-22 | 2022-03-16 | Флуринг Текнолоджис Лтд. | Method for manufacturing a wear-resistant plate based on a wood material |
| EP3757178A1 (en) | 2019-06-25 | 2020-12-30 | Flooring Technologies Ltd. | Production method for at least one material with printed decorative element |
Also Published As
| Publication number | Publication date |
|---|---|
| PL2774770T3 (en) | 2015-10-30 |
| RU2014108004A (en) | 2015-09-10 |
| US9931667B2 (en) | 2018-04-03 |
| RU2612823C2 (en) | 2017-03-13 |
| PT2774770E (en) | 2015-09-14 |
| US20140255670A1 (en) | 2014-09-11 |
| ES2542977T3 (en) | 2015-08-13 |
| EP2774770B1 (en) | 2015-04-29 |
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