Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
  • B27M—WORKING OF WOOD NOT PROVIDED FOR IN SUBCLASSES B27B - B27L; MANUFACTURE OF SPECIFIC WOODEN ARTICLES
  • B27M1/00—Working of wood not provided for in subclasses B27B - B27L, e.g. by stretching
  • B27M1/02—Working of wood not provided for in subclasses B27B - B27L, e.g. by stretching by compressing
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B44—DECORATIVE ARTS
  • B44C—PRODUCING DECORATIVE EFFECTS; MOSAICS; TARSIA WORK; PAPERHANGING
  • B44C5/00—Processes for producing special ornamental bodies
  • B44C5/04—Ornamental plaques, e.g. decorative panels, decorative veneers
• • 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
  • B05D1/00—Processes for applying liquids or other fluent materials
  • B05D1/40—Distributing applied liquids or other fluent materials by members moving relatively to surface
• • 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
  • B05D2203/00—Other substrates
  • B05D2203/20—Wood or similar material
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
  • B05D5/06—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain multicolour or other optical effects
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
  • B05D7/50—Multilayers
  • B05D7/56—Three layers or more
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
  • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
  • B27N7/00—After-treatment, e.g. reducing swelling or shrinkage, surfacing; Protecting the edges of boards against access of humidity
  • B27N7/005—Coating boards, e.g. with a finishing or decorating layer
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
  • B41J3/00—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed
  • B41J3/407—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed for marking on special material
• • 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

Definitions

• the present invention relates to a method for producing an OSB provided with a printed surface and a printed OSB.
• HWS wood-based materials
• the OSB is manufactured in a multi-stage process, with the long, flat chips (strands) made from debarked logs, in particular softwood, being peeled off lengthways by rotating knives.
• the strands typically have a length between 50-200 mm, a width between 5-20 mm and a thickness between 0.1 and 1 mm.
• the strands are introduced into a gluing device in which glue or adhesive is applied to the strands in finely divided form.
• PMDI polymeric diphenylmethane diisocyanate
• MUPF glue melamine-urea-phenol-formaldehyde
• the glued strands are scattered alternately lengthways and crossways to the production direction, so that the strands are arranged crosswise in at least 3 layers (lower cover layer, middle layer, upper cover layer).
• the stray direction of the strands is rotated 90 ° from one layer to the next.
• the stray direction of the strands and the long, slim, flat shape of the strands also result in the high flexural strength of OSB material boards, which is important for many applications.
• Another advantage is that this product has a lower bulk density (approx. 650 kg / m 3 ) compared to other wood-based materials due to the use of conifers.
• the geometry and scatter of the strands does not usually result in a closed surface for the OSB, but in a structure with depressions that can be up to several millimeters deep. These depressions or holes accelerate the penetration of water into deeper areas of the OSB when it is raining or under other stresses in which water is present. This can lead to undesirable swellings with a deterioration in the strength values and, for example, after an event of rain cause a weight gain due to the additional water absorption.
• the OSB can also quickly become dirty or chemicals can penetrate the surface of the board, which can cause glue hydrolysis or color changes.
• wood-based materials are already used for the facade. It is then often fiberboard that is often still manufactured using the wet process. Phenolic resins are then used as glues, which in combination with a high bulk density of the product provide low swelling.
• the wood material which usually has a relatively strong surface structure, must be protected against the ingress of water. This is done by using varnishes that are suitable for outdoor use and therefore suitable for weathering, which are applied to the structured plate using the casting process.
• the small-format panels (3.66 x 0.3 m) are then often nailed to a wooden substructure.
• the high bulk density mentioned above naturally leads to increased effort in structuring.
• a carrier board with a high bulk density leads to handling problems during assembly with larger-sized boards.
• fiberboard which have been produced by the wet process and contain phenolic resin as a binder, tend to warp when the climatic conditions change. For this reason, these plates are mostly only used in low thicknesses and / or only in small formats.
• the invention is therefore based on the technical problem of developing a method which, at low additional costs, produces an OSB which has a surface which can be printed on. This surface should also act as a moisture barrier that prevents water from entering.
• This object is achieved according to the invention by a method for producing an OSB provided with a structured surface with the features of claim 1 and a structured OSB produced by this method according to claim 13.
• a hot melt adhesive is applied to the surface of the OSB, the hot melt adhesive layer filling the surface (filling in the depressions) of the OSB.
• the application of the plastic resin in the form of a hot melt adhesive or hot melt can be carried out in synchronism with a smooth roller. As a result, a bead can be formed in front of the roller on the OSB, which is able to fill up the depressions on the OSB surface.
• the hot hot melt also impregnates the beaches, which not only leads to the expected hydrophobization of the wood, but also creates a wood-plastic laminate. This could be made possible by the fact that the strands have a very large surface area after drying and that there are many cavities in the wood itself, which can be easily filled with hot melt.
• a second, heated roller preferably runs in opposite direction over the still plastic hot melt surface and carries out a further smoothing. This process can also take place in two parts, i.e. H. After the hot melt coating, the OSB are temporarily stored and then smoothed in the next step. However, it should not take too much time between steps 1 and 2, as a polyurethane hot melt continues to cross-link with moisture.
• the hotmelt adhesives used according to the invention are typically solvent-free and mostly solid at room temperature, which are applied in the molten state to an adhesive surface and, when cooled, form a solid bond.
• the adhesive properties are therefore brought about by the solidification due to cooling and not by curing, in conjunction with a chemical crosslinking reaction.
• Typical areas of application are e.g. the coating of edges, surface gluing, as a pressure sensitive hot-melt adhesive on envelopes or the use as a wrapping adhesive.
• the use of hot melt adhesives as a surface coating of OSB is not yet known.
• the at least one hot melt adhesive is selected from a group comprising polyurethane, for example thermoplastic polyurethanes, polyamide, ethylene vinyl acetate, polyester or polyolefin.
• polyurethane for example thermoplastic polyurethanes, polyamide, ethylene vinyl acetate, polyester or polyolefin.
• the choice of material is made with regard to the intended area of application and the resulting stress in terms of temperature, chemicals, water, etc.
• the resin layers are preferably solidified by cooling.
• Polyurethane and polyolefin are preferred because of their higher heat resistance (> 100 ° C).
• the use of polyurethane has the further advantage that post-crosslinking takes place with the wood surface, which results in particularly good adhesion to the beach surface.
• the hot melt adhesive used is applied according to the invention at a temperature which is above the application temperature recommended by the manufacturer (which corresponds approximately to the melting temperature of the adhesive). Due to the increased temperature of the hot melt adhesive, the viscosity of the hot melt adhesive is reduced and enables the hot melt adhesive to penetrate into the wood structure in an improved manner. At the same time, the wooden beaches are impregnated on the OSB surface.
• the hot melt adhesive is applied at a temperature which is 10 to 50 ° C., preferably 25 to 45 ° C., above the usual processing temperature or application temperature of the hot melt adhesive.
• the application temperatures of the hot melt adhesives recommended by the manufacturer vary depending on the chemical composition of the hot melt adhesives. Typical application temperatures of polyamides are above 200 ° C, of polyethylene between 140 and 200 ° C, or of EVA at approx. 150 ° C.
• a polyurethane hot melt variant with a usual processing window between 130 and 150 ° C this is preferably applied at a temperature of 170-180 ° C (e.g. 175 ° C).
• the application is preferably carried out at a temperature of 210-220 ° C (e.g. 210 ° C).
• the at least one hotmelt adhesive layer is applied at a temperature between 150 and 250 ° C., preferably between 170 and 210 ° C., particularly preferably between 180 and 200 ° C.
• the viscosity of the hot melt adhesive to be applied can be in a range between 5500 and 6200 mPas (Brookfield) for a polyurethane hot melt or in a range between 13000 and 15000 mPas.
• the use or application of a hot melt adhesive with an increased temperature (and reduced viscosity) also enables the beaches to be impregnated, which not only leads to water repellency of the wood but also results in the formation of a wood-plastic laminate. This is due to the fact that the strands have a very large surface area after drying and that there are many cavities in the wood itself that can be filled with the hot melt adhesive.
• the second side (underside) of the OSB with a hotmelt adhesive layer, for example in an amount of 50 to 150 g / m2, preferably 100 g / m 2 .
• a hotmelt adhesive layer for example in an amount of 50 to 150 g / m2, preferably 100 g / m 2 .
• the same processing conditions are chosen as described above.
• the at least one decorative layer is applied using the gravure printing method or preferably using the digital printing method.
• a water-based pigmented printing ink can be applied using the gravure printing process or the digital printing process. This water-based pigmented printing ink can also be applied in more than one layer, for example two to ten layers, preferably three to eight layers.
• the at least one decorative layer can be applied by means of an analog gravure printing process and / or a digital printing process.
• the gravure printing process is a printing technique in which the elements to be imaged are present as depressions in a printing form which is inked before printing.
• the printing ink is primarily located in the depressions and is applied to the object to be printed, e.g. due to the pressure of the printing form and the adhesive forces. a wood fiber board.
• digital printing the print image is transferred directly from a computer to a printing press, e.g. a laser printer or inkjet printer.
• the use of a static printing form is not necessary. In both processes, the use of aqueous paints and inks or coloring agents based on UV is possible.
• step d) of printing is carried out directly on the smoothed hotmelt adhesive layer; i.e. the previous application of primer coat and primer, which is otherwise common with wood-based panels, is dispensed with.
• the hotmelt adhesive layer surprisingly fulfills the function of a primer / primer layer. Accordingly, the OSB board coating produced in this way is free of primer and primer layers.
• the use of a primer and a primer when using UV inks can be dispensed with. It is particularly positive that due to the large strands in the top layer when printing without prior priming, the strands under the print contribute to the decor impression.
• the use of a colored hot melt adhesive is provided. This has the advantage that you can change the color of the primer relatively quickly. In that case, only several hot melt commissioned works must be available. With the hot-melt adhesive colored in any color, either part or all of the primer can be applied. Of course, partial or complete blocking of the subsoil can be achieved in both cases. This only depends on the desired decorative effect.
• water-based inks can also be used, which are printed on the - if necessary, primed hot melt surface. This produces prints that produce a surprising, veneer-like decorative impression in wood reproductions.
• digital printing can be used to give the prints a used look. This can be particularly advantageous if the products are later used for outdoor applications (facade). There yellowing / fading can be generated directly via the print.
• a primer layer and primer layer to the hot melt adhesive layer before direct printing.
• the surface can of course be blocked off by applying a primer, especially in the case of fantasy decors or stone reproductions.
• at least one primer layer is applied to the carrier plate, then subsequently applied to the same at least one primer layer, for example in the form of a UV or ESH spatula.
• the amount of liquid primer applied would then be between 1 and 30 g / m 2 , preferably between 5 and 20 g / m 2 , particularly preferably between 10 and 15 g / m 2 .
• a composition of casein as a binder and inorganic pigments, in particular inorganic color pigments, could be used as the primer layer.
• White pigments such as titanium dioxide (TiO 2 ) can be used as color pigments.
• Other color pigments can be calcium carbonate, barium sulfate or barium carbonate.
• the primer also contains water as a solvent.
• the at least one (first) lacquer layer is applied to the at least one in an amount between 30 and 150 g / m 2 , preferably between 50 and 120 g / m 2 , preferably between 60 and 100 g / m 2 Decorative layer applied.
• radiation-curable, acrylate-containing paints are used as paints, which have high UV stability and good resistance to weather influences.
• the radiation-curable lacquers used for this contain methacrylates, such as, for example, polyester (meth) acrylates, polyether (meth) acrylates, epoxy (meth) acrylates or urethane (meth) acrylates.
• the acrylate or the acrylate-containing lacquer used has substituted or unsubstituted monomers, oligomers and / or polymers, in particular in the form of acrylic acid, acrylic ether and / or acrylic acid ester monomers, oligomers or polymers.
• the acrylates mentioned enable crosslinking in the presence of UV radiation or electron beams in the curing or drying process.
• isocyanate acrylates are preferably used as lacquers, non-aromatic, aliphatic isocyanates, such as hexamethylene diisocyanate, isophorone diisocyanate, or prepolymers containing these isocyanates being particularly preferred with regard to the isocyanate component.
• the coating layer (s) can be applied in a coating line with the help of one or more casting heads or roller application units.
• the layers of paint can be cured with an electron beam.
• the first lacquer layer can contain abrasion-resistant particles.
• the abrasion-resistant particles are preferably selected from the group comprising aluminum oxides, corundum, boron carbides, silicon dioxides, silicon carbides and glass spheres.
• the first lacquer layer contains 10-30% by weight, preferably 20% by weight, of corundum.
• At least one further second lacquer layer is applied to the first lacquer layer.
• This further second lacquer layer can be applied in an amount between 10 and 50 g / m 2 , preferably between 15 and 30 g / m 2 , preferably between 20 and 25 g / m 2 .
• This further second lacquer layer can also be referred to as a sanding base.
• the above-mentioned acrylates are also used here.
• the topcoat layer is applied in an amount between 5 and 50 g / m 2 , preferably between 6 and 20 g / m 2 , preferably between 7 and 10 g / m 2 .
• the above-mentioned acrylates are also used here.
• the top layers of lacquer can also be cured using excimer radiation.
• the excimer radiation also causes additional crosslinking of the monomers, which increases the surface hardness, and the entire layer structure is then subjected to final curing in the ESH lamp.
• the present method enables the provision of a printed OSB board.
• the printed OSB plate thus comprises an OSB carrier plate, a smoothed hot-melt adhesive layer provided at least on one surface of the OSB carrier plate, at least one decorative layer provided on the smoothed hot-melt adhesive layer and at least one lacquer layer provided on the decorative layer.
• the printed OSB plate comprises the following layer structure: OSB carrier plate, a smoothed hot-melt adhesive layer provided at least on one surface of the OSB carrier plate, at least one decorative layer provided on the smoothed hot-melt adhesive layer, in particular in direct printing applied decorative layer, at least one lacquer layer provided on the decorative layer and at least one top coat layer.
• OSB panels are particularly suitable for use as wall cladding in areas without direct weathering, e.g. Riding halls, stables, etc. suitable.
• the printed OSB plate comprises the following layer structure: OSB carrier plate, a smoothed hot-melt adhesive layer provided at least on one surface of the SB carrier plate, at least one decorative layer provided on the smoothed hot-melt adhesive layer, in particular decorative layer applied in direct printing, at least one on the Decor layer provided first paint layer comprising abrasion-resistant particles, at least one second paint layer and at least one top coat layer.
• Such OSB panels are particularly suitable for use as floor elements.
• PU hotmelt (21 602.30) is applied to a 10 mm OSB (format: 2800 x 2070 mm) using a roller applicator. The application was carried out in synchronism and was 100 g / m 2 . The temperature of the hot melt was 165 ° C (normal processing window: 130 - 150 ° C). In a second roller applicator, the PU hotmelt surface was smoothed in reverse with a heated steel roller (165 ° C).
• the bottom of the OSB was also coated with a PU hot melt (21 602.30) in an amount of 100 g / m 2 .
• a PU hot melt 21 602.30
• the same processing conditions were chosen as described above.
• the smoothed PU surface was printed with a wood decor (walnut) using a digital printer that works with UV inks, whereby neither a primer nor a primer was used.
• the plates were then cast in a coating line with a UV varnish (application amount: 60 g / m 2 ).
• the lacquer layer was hardened with an electron beam.
• a topcoat based on acrylate (application quantity: 7 g / m 2 ) was also applied with a roller.
• the top coat of paint was then cured with an excimer emitter. At the end there was a hardening with an ESH lamp.
• the feed of the system was 25 m / min.
• a gloss level determination of the surface gave a value of 4.6 gloss points (measurement geometry: 60 °).
• the large-format OSBs are then cut into 2050 x 625 mm sheets, provided with a fold and cut edge sealing with a PU hot melt.
• the panels can then be used outdoors e.g. can be used on a wooden structure for wall cladding.
• PU hot melt (21 602.30) is applied to a 12 mm OSB using a roller applicator. The application was carried out in synchronism and was 100 g / m 2 . The temperature of the hot melt was 165 ° C (normal processing window: 130 - 150 ° C). In a second roller applicator, the PU hotmelt surface was smoothed in reverse with a heated steel roller (165 ° C).
• the PU surfaces were printed with a wood decor (Mahagonni) using a digital printer that works with UV inks, whereby neither a primer nor a primer was used.
• a wood decor Mohagonni
• the plates were then cast in a coating line with a UV varnish (application amount: 100 g / m 2 ).
• the paint contained about 20% by weight of corundum as an anti-wear agent.
• the lacquer layer was hardened with an electron beam.
• an acrylate-based abrasive base was also applied with a roller (application amount: 20 g / m 2 ). That was hardened with the help of a UV lamp.
• an acrylic-based topcoat was applied (application quantity: 15 g / m 2 ).
• the lacquer layers were then fully hardened using an ESH lamp.
• the feed of the system was 25 m / min.
• the wear resistance of a sample was determined using the Falling Sand method. This resulted in a value of 5000 um.
• the OSB were provided with a glueless profile on a floor street and could then be used as a floor.

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• Engineering & Computer Science (AREA)
• Life Sciences & Earth Sciences (AREA)
• Mechanical Engineering (AREA)
• Wood Science & Technology (AREA)
• Forests & Forestry (AREA)
• Laminated Bodies (AREA)
• Application Of Or Painting With Fluid Materials (AREA)
• Diaphragms For Electromechanical Transducers (AREA)

Priority Applications (4)

Applications Claiming Priority (1)

Publications (3)

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Family Applications (1)

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Citations (2)

• 2018
  • 2018-05-04 ES ES18170772T patent/ES2950103T3/es active Active
  • 2018-05-04 EP EP18170772.0A patent/EP3597312B1/fr active Active
  • 2018-05-04 HU HUE18170772A patent/HUE063082T2/hu unknown
  • 2018-05-04 PL PL18170772.0T patent/PL3597312T3/pl unknown

Patent Citations (2)

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