EP3246175B1 - Method of producing an abrasion resistant wooden panel and production line for same - Google Patents
Method of producing an abrasion resistant wooden panel and production line for same Download PDFInfo
- Publication number
- EP3246175B1 EP3246175B1 EP16170640.3A EP16170640A EP3246175B1 EP 3246175 B1 EP3246175 B1 EP 3246175B1 EP 16170640 A EP16170640 A EP 16170640A EP 3246175 B1 EP3246175 B1 EP 3246175B1
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- EP
- European Patent Office
- Prior art keywords
- resin layer
- upper side
- wood material
- underside
- material board
- 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.)
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- 229910052593 corundum Inorganic materials 0.000 claims description 45
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- 239000002245 particle Substances 0.000 claims description 24
- 238000012545 processing Methods 0.000 claims description 20
- QXJJQWWVWRCVQT-UHFFFAOYSA-K calcium;sodium;phosphate Chemical compound [Na+].[Ca+2].[O-]P([O-])([O-])=O QXJJQWWVWRCVQT-UHFFFAOYSA-K 0.000 claims description 12
- 229920003043 Cellulose fiber Polymers 0.000 claims description 8
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- 229920002522 Wood fibre Polymers 0.000 claims description 4
- 239000000428 dust Substances 0.000 claims description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 3
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- 235000012239 silicon dioxide Nutrition 0.000 claims description 2
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- 238000005034 decoration Methods 0.000 claims 1
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims 1
- 239000000377 silicon dioxide Substances 0.000 claims 1
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- 239000011324 bead Substances 0.000 description 28
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- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- 229920001587 Wood-plastic composite Polymers 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- AYJRCSIUFZENHW-UHFFFAOYSA-L barium carbonate Chemical compound [Ba+2].[O-]C([O-])=O AYJRCSIUFZENHW-UHFFFAOYSA-L 0.000 description 2
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- BECPQYXYKAMYBN-UHFFFAOYSA-N casein, tech. Chemical group NCCCCC(C(O)=O)N=C(O)C(CC(O)=O)N=C(O)C(CCC(O)=N)N=C(O)C(CC(C)C)N=C(O)C(CCC(O)=O)N=C(O)C(CC(O)=O)N=C(O)C(CCC(O)=O)N=C(O)C(C(C)O)N=C(O)C(CCC(O)=N)N=C(O)C(CCC(O)=N)N=C(O)C(CCC(O)=N)N=C(O)C(CCC(O)=O)N=C(O)C(CCC(O)=O)N=C(O)C(COP(O)(O)=O)N=C(O)C(CCC(O)=N)N=C(O)C(N)CC1=CC=CC=C1 BECPQYXYKAMYBN-UHFFFAOYSA-N 0.000 description 2
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- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
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Images
Classifications
-
- 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
- B44C5/0469—Ornamental plaques, e.g. decorative panels, decorative veneers comprising a decorative sheet and a core formed by one or more resin impregnated sheets of paper
- B44C5/0476—Ornamental plaques, e.g. decorative panels, decorative veneers comprising a decorative sheet and a core formed by one or more resin impregnated sheets of paper with abrasion resistant properties
-
- 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
- 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
- B44C5/0469—Ornamental plaques, e.g. decorative panels, decorative veneers comprising a decorative sheet and a core formed by one or more resin impregnated sheets of paper
- B44C5/0492—Ornamental plaques, e.g. decorative panels, decorative veneers comprising a decorative sheet and a core formed by one or more resin impregnated sheets of paper containing wooden elements
Definitions
- the present invention relates to a method for producing an abrasion-resistant wood-based panel according to the preamble of claim 1, a production line for carrying out this method according to claim 12 and a wood-based panel according to claim 14.
- a variety of products or product surfaces which are subject to mechanical wear and tear must be protected by the application of wear-resistant coatings, from premature damage or destruction by wear. These products may, for. B. to furniture, interior panels, floors, etc. act. Depending on the frequency and intensity of the load, different protective measures have to be applied so that the user can be guaranteed the longest possible service life.
- thermosetting resins papers that are pressed in so-called short-cycle presses on the wood material carrier used.
- thermosetting resin melamine-formaldehyde resin is very often used.
- overlay papers As a protection for the decorative surfaces so-called overlay papers have been used for a long time, which are thin, ⁇ -cellulose-containing papers. These have after impregnation with melamine-formaldehyde resins and Mitverpressung on the decorative papers a high transparency, so that the brilliance of the decor is not or only slightly affected.
- corundum-containing formulations cause in the further process step of the compression is the sheet metal wear, which is the higher the more corundum in g per square meter are applied and the worse this corundum is covered by corundum-free resin layers. For this reason alone, a required value in the behavior against abrasion should be achieved with as little as possible corundum. Of course, higher corundum consumption also means higher costs and unnecessary consumption of resources.
- WO 2011/076305 A1 discloses a method and a production line for producing a wood-based panel having a top-side decorative layer and three top and bottom resin layers, the first top-layer resin containing abrasion-resistant particles and the third resin layer containing glass spheres.
- CA 2 283 835 A1 discloses a method of spreading abrasion-resistant particles onto a wet resin layer.
- the present invention is therefore based on the technical task, in addition to the safe achievement of high abrasion values, in particular the abrasion classes AC4 to AC6 with simultaneously low pressure plate wear. This should be achieved especially for a process in which printed plates in a variety of formats should be processed. If possible, a process simplification and at least a cost neutrality should be achieved.
- the disadvantages already discussed should, if possible, no longer occur through a new process. It should also enable effective quality control that provides timely information about the current process.
- a first resin layer in particular in the form of a first thermosetting resin layer, such as a melamine-formaldehyde resin layer, is applied to the decorative layer (pretreated or not pretreated) of the wood-based panel.
- a first thermosetting resin layer such as a melamine-formaldehyde resin layer
- the abrasion-resistant particles are sprinkled evenly onto the wet or still liquid first resin layer on top of the wood-based panel using a suitable scattering device. Because the first Resin layer is still liquid at the time of scattering, the abrasion-resistant particles can sink into the resin layer. Only after the abrasion-resistant particles have been sprinkled onto the first resin layer is a drying step carried out, for example, using a circulating-air dryer, whereby the attrition-resistant particles in the at least one first resin layer are immobilized.
- abrasion-resistant material such as corundum
- the layer of abrasion-resistant material can be significantly better sealed off with subsequent resin layers against the press plate. This reduces sheet metal wear. This is also achieved by the lower application rate needed to achieve a certain abrasion resistance.
- the present method it is possible to reduce the consumption of abrasion-resistant material, to reduce equipment wear, e.g. Wear of the press plate in the press or the resin feed lines is reduced, the application of abrasion-resistant material to the wood-based panel is more uniform, the transparency is improved. Overall, the process costs are reduced due to reduced material and maintenance costs. In addition, the quantity determination of the applied abrasion-resistant material and thus also the quality control is simplified, as explained in more detail below.
- the amount of the first resin layer applied to the upper side of the wood-based panel may be between 50-100 g / m 2 , preferably 60-80 g / m 2 , particularly preferably 70 g / m 2 .
- the amount of the first resin layer applied to the underside of the wood-based panel may be between 50-100 g / m 2 , preferably 60-80 g / m 2 , particularly preferably 60 g / m 2 .
- the first lower resin layer eg brownish
- the first lower resin layer is colored to simulate a counter-pull.
- the solid content of the resin used for the first resin layer is 50-70% by weight, preferably 50-60% by weight, more preferably 55% by weight for both the top and the bottom.
- the first resin layer is preferably applied parallel or simultaneously to the top and bottom of the wood-based panel in at least one double application device (roller application unit).
- the applied on the bottom resin layers act in return.
- the counter-coating applied to the underside corresponds in layer construction and the respective layer thickness approximately to the layer sequence applied on the upper side with the difference of the abrasion-resistant particles and glass spheres, as explained in detail below.
- the abrasion-resistant particles used to increase the wear resistance preferably comprise corundum (aluminum oxides), boron carbides, silicon dioxides, silicon carbides, the use of corundum being particularly preferred.
- the amount of scattered abrasion-resistant particles is 10 to 50 g / m 2 , preferably 10 to 30 g / m 2 , particularly preferably 15 to 25 g / m 2 .
- 14 g / m 2 or 23 g / m 2 of abrasion-resistant particles can be scattered.
- the determination of the applied amount of abrasion resistant material on the wood panel can be made in a simple and accurate manner. This can be done by simply placing one or more shallow trays beneath the spreader or spreader. Subsequently, the spreader is run for a certain defined period of time, the amount of abrasion resistant material collected in the trays is balanced and the balanced amount of abrasion resistant material is divided by the plant feed. This can z. B. the deviation between left - center - be determined right, the stray inaccuracy of the scattering device should be at +/- 1 g / m 2 in width.
- the amount of the second resin layer applied to the upper side of the wood-based panel may be between 10-50 g / m 2 , preferably 20-30 g / m 2 , particularly preferably 25 g / m 2 .
- the amount of the second resin layer applied to the underside of the wood-based panel may be between 30-80 g / m 2 , preferably 40-60 g / m 2 , particularly preferably 50 g / m 2 .
- the solid content of the resin used for the second resin layer is 50-70% by weight, preferably 50-60% by weight, more preferably 55% by weight for both the top and the bottom.
- at least a third resin layer is applied to the top and bottom of the wood-based panel, i. applied to the respective second (dried) resin layer.
- the amount of the third resin layer applied to the upper side of the wood-based panel may be between 10-40 g / m 2 , preferably 15-30 g / m 2 , particularly preferably 20 g / m 2 , the solids content being between 50-80% by weight, preferably 60-70% by weight, particularly preferably 60-65% by weight, for example at 61.5% by weight.
- the resin to be applied as the third resin layer on top of the wood-based panel contains glass beads, the glass beads preferably acting as spacers.
- the glass beads preferably used have a diameter of 50-100 microns, preferably from 60-80 microns.
- the application amount of the glass beads, when applied together with the third resin layer is 1-5 g / m 2 , preferably 2-4 g / m 2 , particularly preferably 3 g / m 2 .
- the glass beads can be sprinkled onto the applied on the top of the wood-based panel third resin layer.
- the application amount of the glass beads is 5-10 g / m 2 , preferably 6-8 g / m 2 , particularly preferably 6 g / m 2 .
- the amount of the third resin layer applied to the underside of the wood-based panel may be between 20-70 g / m 2 , preferably 30-50 g / m 2 , particularly preferably 40 g / m 2 at a solids content of 50-70% by weight, preferably 50-70% by weight. 60% by weight, particularly preferably 55% by weight.
- the third resin layer applied in each case on the upper side and lower side of the wood-based panel is dried in at least one drying device. Following the drying process for the third resin layer, according to the invention at least one fourth resin layer is applied to the upper side and the lower side of the wood-based panel, ie to the respective third resin layer.
- the amount of the fourth resin layer applied to the upper side of the wood-based panel may be between 10-40 g / m 2 , preferably 15-30 g / m 2 , particularly preferably 20 g / m 2 at a solids content of 50-80% by weight, preferably 60-80% by weight. 70% by weight, particularly preferably 60-65% by weight, for example 61.6% by weight.
- the resin to be applied as the fourth resin layer on top of the wood-based panel contains glass beads and / or fibers, in particular wood fibers or cellulose fibers.
- the application amount of glass beads is 1-5 g / m 2 , preferably 2-4 g / m 2 , particularly preferably 3 g / m 2 .
- the application amount of the fibers, such as cellulose fibers, when applied together with the fourth resin layer, is between 0.1-0.5 g / m 2 , preferably 0.2-0.4 g / m 2 , particularly preferably 0 , 25 gsm.
- the addition of glass beads and / or fibers such as cellulose fibers to the uppermost fourth layer contributes to the wear resistance of the wood-based panel.
- the amount of the fourth resin layer applied to the underside of the wood-based panel may be between 10-60 g / m 2 , preferably 20-50 g / m 2 , particularly preferably 30 g / m 2 at a solids content of 50-70% by weight, preferably 50-70% by weight. 60% by weight, particularly preferably 55% by weight.
- the fourth resin layer which is applied on the upper side and lower side of the wood-based panel, is finally dried in at least one further drying device.
- the drying of the respective resin layers is preferably carried out to a residual moisture of 6-9% by weight, for example in a circulating air dryer.
- the layer structure is compressed under pressure and temperature in a short-cycle press at temperatures between 150 and 250 ° C., preferably between 180 and 230 ° C., particularly preferably at 200 ° C. and a pressure between 100 and 1000 N / cm 2 , preferably 300 and 700 N / cm 2 , particularly preferably between 400 and 600 N / cm 2 .
- a wood-based panel or as a support plate medium density fiber (MDF), high density fiber (HDF), coarse chip (OSB) or plywood, a cement fiber board and / or gypsum fiber board, a wood-plastic plate, in particular a Wood Plastic Composite (WPC) plate used.
- MDF medium density fiber
- HDF high density fiber
- OSB coarse chip
- WPC Wood Plastic Composite
- the above-mentioned decorative layer can be applied by direct printing.
- direct printing the application of a water-based, pigmented ink by gravure or digital printing, wherein the water-based pigmented ink is applied in more than one layer, e.g. in the form of two to ten layers, preferably three to eight layers.
- the application of the at least one decorative layer takes place as mentioned by means of an analogue gravure printing 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 of a printing form, which is inked before printing.
- the ink is located primarily in the recesses and is due to the pressure of the printing plate and adhesive forces on the object to be printed, such as. a wood fiber support plate, transferred.
- digital printing the print image is transferred directly from a computer to a printing press, such as a press. transmit a laser printer or inkjet printer. This eliminates the use of a static printing form.
- Both methods allow the use of aqueous inks and inks or UV-based colorants. It is also conceivable to combine the mentioned printing techniques from gravure and digital printing. A suitable combination of the printing techniques can be done either directly on the support plate or the layer to be printed or even before printing by adjusting the electronic records used.
- At least one primer layer is arranged between the wood-based material board or carrier plate and the at least one decorative layer.
- the primer layer preferably used here comprises a composition of casein as binder and inorganic pigments, in particular inorganic color pigments.
- color pigments white pigments such as titanium dioxide can be used in the primer layer, or else further color pigments, such as calcium carbonate, barium sulfate or barium carbonate.
- the primer may contain water as a solvent in addition to the color pigments and casein. It is likewise preferred if the applied pigmented basecoat comprises at least one, preferably at least two, more preferably at least four, successively applied layers or jobs, the application quantity between the layers or applications being the same or different.
- the present method thus makes it possible to produce an abrasion-resistant wood-based panel with at least one decorative layer on the upper side, at least one first resin layer on the upper side and underside, at least one layer of abrasion-resistant particles on and / or in the first resin layer on the upper side, and at least one second Resin layer on the top and bottom of the wood-based panel.
- at least a third and fourth resin layer are provided on the upper side and lower side of the wood-based panel, glass balls or glass beads and / or fibers, in particular cellulose fibers, being contained in the third and fourth resin layer provided on the upper side of the wood-based panel.
- the present method makes it possible to produce an abrasion-resistant wood-based panel with the following layer structure (seen from the bottom upwards): Backing of four resin layers - backing plate - primer layer - print decor layer - first resin layer - layer of abrasion-resistant particles - second resin layer - third resin layer with glass beads - fourth resin layer with glass beads and / or cellulose fibers.
- the spreader or scattering device is therefore installed in a production line in which aqueous resins can be applied to primed and printed plates via several roller applicators. At the beginning of the process, a resin coating is applied to individual plates, into which the abrasion-resistant material such as corundum is then sprinkled with the spreader.
- the spreader provided in the present production line is suitable for spreading powder, granules, fibers and comprises an oscillating brush system.
- the spreader consists essentially of a storage hopper, a rotating, structured roller and a scraper.
- the order quantity of abrasion-resistant material is determined by the rotational speed of the roller.
- the at least one scattering device is surrounded by at least one cabin provided with at least one means for removing dusts occurring in the cabin.
- the means for removing the dust may be in the form of a suction device or as a device for blowing in air.
- the injection of air can be achieved through nozzles installed at the plate inlet and outlet, which inject air into the cabin. In addition, these can prevent air movements from creating an inhomogeneous curtain of abrasion-resistant material.
- the removal of the dust from abrasion-resistant material from the environment of the spreader is advantageous because in addition to the apparent health burden for working on the production line workers of particulate matter from abrasion-resistant particles deposits on other parts of the production line and leads to increased wear of the same.
- the arrangement of the scattering device in a cabin therefore not only serves to reduce the health dust load of the environment of the production line but also prevents premature wear.
- the scattering device is preferably controlled by a light barrier, the light barrier being arranged in the processing direction in front of the roller (scattering roller) provided below the scattering device.
- the control of the spreader by a Photoelectric sensor makes sense that between the individual wood-based panels more or less large gaps are. This starts the scattering process as soon as a plate is in front of the scattering roller.
- At least one funnel for collecting excess abrasion-resistant particles is provided in front of the scattering roller ,
- the hopper is coupled to at least one conveyor and a screening device, wherein the collected in the hopper excess abrasion resistant material is transported via the conveyor to the screening device.
- the screen meshes of the screening device correspond to the largest grain used of the abrasion resistant particulate material (i.e., about 80-100 ⁇ m).
- debris and clumped material such as clumped resin or clumped abrasion resistant material
- the sieved abrasion resistant material can be recycled to the spreader.
- the in the FIG. 1 schematically illustrated production line comprises four double application units 1, 2, 3, 4 for simultaneous application of the respective resin layer on the top and bottom of the individual printed material plates eg of printed HDF plates and four arranged in the processing direction behind the double application units convection dryer 1a, 2a, 3a , 4a.
- a first scattering device 10 is also provided for uniformly spreading the abrasion-resistant material, such as corundum, onto the first resin layer on top of the HDF plate. The drying of the first resin layer then takes place in the first convection dryer 1a.
- the third double applicator 3 for applying the third resin layer may be followed by a further diffuser 20 for applying glass beads to the third resin layer, followed by a third convection dryer 3a for drying the third resin layer.
- the diffuser 20 for the glass beads is optional.
- the glass beads are applied according to the invention together with the third resin layer.
- the fourth resin layer which in the case of the fourth resin layer on the upper side, e.g. Cellulose fibers may contain, in a fourth Doppelspeakingswerk 4 and drying in a fourth convection dryer 4a
- the layer structure is pressed in a short-cycle press 5. The pressed plates are cooled and stored.
- a stack of printed HDF (dark wood decor) is separated in front of the production line and transported through the line at a speed of 28 m / min.
- a first roller application unit about 70 g of melamine resin fl. (Solids content: 55% by weight) containing the usual auxiliaries (hardener, wetting agent, etc.) are applied to the plate surface. On the underside of the plate, a melamine resin is also applied with the first roller application unit (application rate: 60 g resin fl. / M 2 , solids content: about 55% by weight).
- corundum / m 2 (F 200) are sprinkled onto the surface with a spreader. By a distance of about 5 m to the dryer, the corundum is allowed to sink into the melamine resin. Then the plate passes through a circulating air dryer. Thereafter, a melamine resin layer (solid content: 55% by weight) is applied in an amount of 25 g / m 2 . These also contain the usual auxiliaries. On the underside of the plate, a melamine resin is also applied with a roller application unit (application rate: 50 g of resin fl./m 2 , solids content: about 55% by weight). Again, the plate is dried in a circulating air dryer.
- a melamine resin is applied to the plate surface, which additionally contains glass beads. These have a diameter of 60 - 80 microns.
- the application rate of the resin is about 20 g melamine resin fl./m 2 (solids content: 61.5% by weight).
- the formulation also contains a release agent.
- the order quantity of glass beads is about 3 g / m 2 .
- a melamine resin is also applied with a roller application unit (application rate: 40 g resin fl. / M 2 , solids content: about 55% by weight).
- the plate is again dried in a circulating air dryer and then coated again with a melamine resin containing glass beads.
- cellulose Vivapur 302
- melamine resin fl./m 2 solids content: 61.6% by weight
- glass beads and 0.25 g of cellulose / m 2 are applied.
- the formulas also contain a release agent.
- a melamine resin is also applied with a roller application unit (application rate: 30 g of resin fl. / M 2 , solids content: about 55% by weight).
- the resin is again dried in a circulating air dryer and then the plate is pressed in a short-cycle press at 200 ° C and a pressure of 400 N / cm 2 .
- the pressing time was 10 seconds.
- the structural element used was a press plate with a wood structure.
- a stack of printed HDF (dark wood decor) is separated in front of the production line and transported through the line at a speed of 28 m / min.
- a first roller application unit about 70 g of melamine resin fl. (Solids content: 55% by weight) containing the usual auxiliaries (hardener, wetting agent, etc.) are applied to the plate surface. On the underside of the plate, a melamine resin is also applied with a roller application unit (application rate: 60 g resin fl. / M 2 , solids content: about 55% by weight).
- a second melamine resin layer (solid content: 55% by weight) is applied in an amount of 25 g / m 2 . These also contain the usual auxiliaries.
- a second melamine resin is also applied with a roller application unit (application rate: 50 g resin fl. / M 2 , solids content: about 55% by weight). Again, the plate is dried in a circulating air dryer.
- a third melamine resin is applied again with a roll aggregate.
- the application rate of the resin is about 20 g melamine resin fl./m 2 (solids content: 61.5% by weight).
- the formulation also contains a release agent.
- a third melamine resin is also applied to the underside of the plate with a roller application unit (application rate: 40 g of resin fl. / M 2 , solids content: about 55% by weight). Thereafter, about 6 g of glass balls / m 2 are sprinkled with a scattering unit. These had a diameter of 60-80 microns.
- the plate is again dried in a circulating air dryer and then coated again with a fourth melamine resin containing cellulose (Vivapur 302).
- a fourth melamine resin containing cellulose (Vivapur 302).
- about 20 g of melamine resin fl./m 2 (solids content: 56.0% by weight) are applied.
- 0.25 g cellulose / m 2 are applied.
- a fourth melamine resin is also applied to the underside of the plate with a roller application unit (application rate: 30 g of resin fl./m 2 , solids content: about 55% by weight).
- the formulas also contain a release agent contain.
- the resin is again dried in a circulating air dryer and then the plate is pressed in a short-cycle press at 200 ° C and a pressure of 400 N / cm 2 .
- the pressing time was 10 seconds.
- the structural element used was a press plate with a wood structure.
- a first roller application unit about 70 g of melamine resin fl. (Solids content: 55% by weight) containing the usual auxiliaries (hardener, wetting agent, etc.) on the plate surface applied.
- a melamine resin is applied to the underside of the plate also with a roller application unit applied (application amount:. 60 g resin fl / m 2, solid content: about 55% by weight).
- a second melamine resin layer (solid content: 55% by weight) is applied in an amount of 25 g / m 2 . These also contain the usual auxiliaries.
- a second melamine resin is also applied with a roller application unit (application rate: 50 g resin fl. / M 2 , solids content: about 55% by weight). Again, the plate is dried in a circulating air dryer.
- melamine resin is applied again with a roll aggregate.
- the application rate of the resin is about 20 g melamine resin fl./m 2 (solids content: 61.5% by weight).
- the formulation also contains a release agent.
- a melamine resin is also applied with a roller application unit (application rate: 40 g resin fl. / M 2 , solids content: about 55% by weight).
- about 6 g of glass balls / m 2 are sprinkled with a scattering unit. These had a diameter of 60-80 microns.
- the plate is again dried in a circulating air dryer and then again coated with a melamine resin containing cellulose (Vivapur 302).
- a melamine resin containing cellulose Vivapur 302
- about 20 g of melamine resin fl./m 2 solids content: 56.0% by weight
- 0.25 g cellulose / m 2 are applied.
- a melamine resin is also applied with a roller application unit (application rate: 30 g of resin fl. / M 2 , solids content: about 55% by weight).
- the formulas also contain a release agent.
- the resin is again dried in a circulating air dryer and then the plate is pressed in a short-cycle press at 200 ° C and a pressure of 400 N / cm 2 .
- the pressing time was 10 seconds.
- the structural element used was a press plate with a wood structure.
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
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Description
Die vorliegende Erfindung betrifft ein Verfahren zur Herstellung einer abriebfesten Holzwerkstoffplatte nach dem Oberbegriff des Anspruchs 1, eine Produktionslinie zur Durchführung dieses Verfahrens nach Anspruch 12 und eine Holzwerkstoffplatte nach Anspruch 14.The present invention relates to a method for producing an abrasion-resistant wood-based panel according to the preamble of claim 1, a production line for carrying out this method according to claim 12 and a wood-based panel according to claim 14.
Eine Vielzahl von Produkten bzw. Produktoberflächen, die durch mechanische Beanspruchung einer Abnutzung ausgesetzt sind, müssen durch das Aufbringen von verschleißhemmenden Schichten, vor einer vorzeitigen Beschädigung oder Zerstörung durch Verschleiß geschützt werden. Bei diesen Produkten kann es sich z. B. um Möbeln, Innenausbauplatten, Fußböden usw. handeln. Je nach Beanspruchungsfrequenz und - stärke müssen dabei unterschiedliche Schutzmaßnahmen angewendet werden, damit dem Nutzer eine möglichst lange Nutzungsdauer garantiert werden kann.A variety of products or product surfaces which are subject to mechanical wear and tear must be protected by the application of wear-resistant coatings, from premature damage or destruction by wear. These products may, for. B. to furniture, interior panels, floors, etc. act. Depending on the frequency and intensity of the load, different protective measures have to be applied so that the user can be guaranteed the longest possible service life.
Eine Vielzahl der oben genannten Produkte besitzen dekorative Oberflächen, die bei Verschleiß aufgrund intensiver Nutzung schnell unansehnlich erscheinen und/oder sich nicht mehr reinigen lassen. Diese dekorativen Oberflächen bestehen sehr häufig aus mit duroplastischen Harzen imprägnierten Papieren, die in sogenannten Kurztaktpressen auf die verwendeten Holzwerkstoffträger aufgepresst werden. Als duroplastisches Harz kommt sehr häufig Melamin-Formaldehyd-Harz zum Einsatz.Many of the above products have decorative surfaces that quickly become unsightly when worn due to heavy use and / or are no longer cleanable. These decorative surfaces are very often made of impregnated with thermosetting resins papers that are pressed in so-called short-cycle presses on the wood material carrier used. As a thermosetting resin melamine-formaldehyde resin is very often used.
Als Schutz für die dekorativen Oberflächen wurden schon seit langem sogenannte Overlaypapiere eingesetzt, bei denen es sich um dünne, α-Zellulosehaltige Papiere handelt. Diese besitzen nach Imprägnierung mit Melamin-Formaldehyd-Harzen und Mitverpressung auf den dekorativen Papieren eine hohe Transparenz, sodass die Brillanz des Dekors nicht oder nur wenig beeinträchtigt wird.As a protection for the decorative surfaces so-called overlay papers have been used for a long time, which are thin, α-cellulose-containing papers. These have after impregnation with melamine-formaldehyde resins and Mitverpressung on the decorative papers a high transparency, so that the brilliance of the decor is not or only slightly affected.
Allerdings ist die Verbesserung der Verschleißfestigkeit durch diese Overlaypapiere nicht in allen Fällen ausreichend. Für eine Küchenarbeitsplatte oder für eine Zahltheke waren die Overlaylösungen ausreichend, für stärker beanspruchte Flächen oder sogar Fußböden sind sie es nicht. Eine Lösung wäre hier, die Grammatur des Overlaypapiers zu erhöhen. Jedoch treten dann die nicht gewünschten Verluste an Brillanz auf. Zudem ist für bestimmte Nutzungen ein Overlaypapier alleine nicht ausreichend.However, the improvement in wear resistance by these overlay papers is not sufficient in all cases. For a kitchen countertop or countertop, the overlay solutions were adequate, but they are not for heavier areas or even floors. One solution would be to increase the grammage of the overlay paper. however Then occur the unwanted loss of brilliance. In addition, an overlay paper alone is not sufficient for certain uses.
Deshalb ging man dazu über in die zur Imprägnierung eingesetzten Harzlösungen Mineralien einzubringen, die im Overlaypapier eine verbesserte Verschleißfestigkeit erzeugten. Diese wurden dann mit Hilfe von Rakeln oder Schlitzdüsen auf die Oberfläche der Papiere aufgebracht. Die Mineralien, bei denen es sich vor allem um Korund (Aluminiumoxid) handelt, wurden auch mit Hilfe von Streu- oder Sprühvorrichtungen auf die imprägnierten Papiere aufgebracht.For this reason, minerals were incorporated into the resin solutions used for impregnation, which produced improved wear resistance in the overlay paper. These were then applied to the surface of the papers using doctor blades or slot dies. The minerals, which are mainly corundum (alumina), were also applied to the impregnated papers by means of scatterers or sprayers.
Dies ließ sich besonders deshalb technisch so einfach realisieren, da es sich bei den verwendeten Papieren um Bahnware handelte. Diese läuft als Endlosbahn durch den Imprägnierkanal und kann dann an einer geeigneten Stelle mit dem Korund beaufschlagt werden. Für eine Anwendung von Nicht-Endlosbahnen ist diese Technologie aus den verschiedensten Gründen nicht geeignet. Zum einen muss die Papierbahn durch das Auftragswerk hindurchgeführt werden, was im diskontinuierlichen Betrieb einen sich ständig wiederholenden Einfädelungsprozess erfordern würde. Zum anderen würde die Harzlösung zwischen den einzelnen Papierbögen durch das Auftragswerk hindurchlaufen und müsste aufgefangen und in den Prozess zurückgeführt werden.This was particularly easy to realize because of the fact that the papers used were sheet goods. This runs as a continuous web through the impregnation and can then be acted upon at a suitable location with the corundum. For a non-web application, this technology is not suitable for a variety of reasons. Firstly, the paper web must be passed through the commissioned work, which would require a repetitive Einfädelungsprozess in discontinuous operation. On the other hand, the resin solution would run between the individual sheets of paper through the commissioned work and would have to be collected and returned to the process.
Bei dem Auftrag des korundhaltigen Melaminharzes hat es sich gezeigt, dass durch die Dichteunterschiede zwischen dem Melaminharz und dem Korund Probleme durch Sedimentation auftreten. Dies führt zu Ablagerungen in Ansatzbehältern, Pumpen, Rohrleitungen und den Walzenauftragsaggregaten. Deswegen muss zum einen der gesamte Bereich häufig durch Reinigen von den Ablagerungen befreit werden und zum anderen auch zur Erreichung eines bestimmten Verschleißwertes mit einem höheren Korundauftrag gearbeitet werden. Zusätzlich führt die angesprochene Sedimentation zu Inhomogenitäten in den Auftragswerken, was ebenfalls durch eine Höherdosierung kompensiert werden muss. Ein weiterer gravierender Nachteil dieser Technologie ist, dass durch die korundhaltigen Harzrezepturen ein erheblicher Verschleiß an allen Anlagenteilen auftritt, die mit der Harzrezeptur in Kontakt kommen. Die Höherdosierung in Kombination mit den Sedimentationsproblemen wiederum führt bei höheren Verschleißklassen zu einer schlechteren Transparenz. Dies macht sich besonders bei dunklen Dekoren negativ bemerkbar.When applying the corundum melamine resin, it has been found that sedimentation problems occur due to the density differences between the melamine resin and the corundum. This leads to deposits in neck tanks, pumps, pipelines and the roller application units. For this reason, on the one hand, the entire area often has to be freed from deposits by cleaning and, on the other hand, to achieve a certain level of wear, it is necessary to work with a higher amount of corundum. In addition, the mentioned sedimentation leads to inhomogeneities in the commissioned works, which also has to be compensated by a higher dosage. Another serious disadvantage of this technology is that the corundum-containing resin formulations cause considerable wear on all parts of the system that come into contact with the resin formulation. The higher dosage in combination with the sedimentation problems in turn leads to a lower transparency at higher wear classes. This is especially noticeable in dark decors.
Ein weiteres Problem, das korundhaltige Rezepturen im weiteren Prozessschritt der Verpressung verursachen ist der Blechverschleiß, der umso höher ist je mehr Korund in g pro Quadratmeter aufgetragen werden und je schlechter dieses Korund durch korundfreie Harzschichten abgedeckt ist. Allein aus diesem Grund sollte ein benötigter Wert beim Verhalten gegenüber Abriebbeanspruchung mit so wenig wie möglichem Korund erreicht werden. Selbstverständlich bedeutet ein höherer Korundverbrauch auch höhere Kosten und unnötigen Verbrauch an Ressourcen.Another problem that corundum-containing formulations cause in the further process step of the compression is the sheet metal wear, which is the higher the more corundum in g per square meter are applied and the worse this corundum is covered by corundum-free resin layers. For this reason alone, a required value in the behavior against abrasion should be achieved with as little as possible corundum. Of course, higher corundum consumption also means higher costs and unnecessary consumption of resources.
Ein weiteres Problem ist, dass bei Anlagenstillständen eine schnelle Alterung der Harzansätze mit Korund eintritt. Diese müssen dann entsorgt werden. Dies führt zu erhöhten Entsorgungskosten und einem Materialmehrverbrauch.Another problem is that during plant downtime a rapid aging of the resin approaches with corundum occurs. These must then be disposed of. This leads to increased disposal costs and increased material consumption.
Ein weiteres Problem ist, dass eine effektive Qualitätskontrolle an der Produktionslinie nicht möglich ist. Das Harzrezept gibt einem nur einen ungefähren Wert der Korundmenge an, die auf der Oberfläche vorhanden sein sollte. Die Minderaufträge durch Sedimentation, Viskositätsschwankungen und Inhomogenitäten lassen sich nur schwer abschätzen. Aus diesem Grund muss ein derartiger Prozess durch eine möglichst häufige Bestimmung des Verhaltens gegenüber Abriebbestimmung begleitet werden. Dabei braucht man bei höheren Verschleißklassen für eine Bestimmung mehrere Stunden, was natürlich für eine effektive Prozesskontrolle kontraproduktiv ist. Auch die Kosten für die Prüfung sind nicht zu vernachlässigen. Das bisher gesagte gilt nicht nur für den Auftrag auf Papierbahnen sondern auch für den Auftrag auf (bedruckte) Plattenwerkstoffe.Another problem is that effective quality control on the production line is not possible. The resin recipe indicates only an approximate value of the amount of corundum that should be present on the surface. The reduced orders due to sedimentation, viscosity fluctuations and inhomogeneities are difficult to estimate. For this reason, such a process must be accompanied by the most frequent determination of the behavior against abrasion determination. It takes several hours for higher levels of wear for a determination, which is of course counterproductive for effective process control. Also, the costs of the exam are not negligible. The statements made so far are valid not only for the order on paper webs but also for the order on (printed) board materials.
Es ergeben sich somit verschiedene Nachteile: schlechte Verteilung des Korundes in der Harzlösung, hoher Verschleiß an Anlagenteilen (Pumpen, Walzen usw.), Mehrverbrauch an Korund, schlechte Prozesskontrolle, schlechte Transparenz und höhere Kosten.There are thus various disadvantages: poor distribution of the corundum in the resin solution, high wear on system components (pumps, rollers, etc.), increased consumption of corundum, poor process control, poor transparency and higher costs.
Die gestellte Aufgabe wird erfindungsgemäß durch ein Verfahren mit den Merkmalen des Anspruchs 1 und eine Produktionslinie mit den Merkmalen des Anspruchs 12 gelöst.The stated object is achieved by a method having the features of claim 1 and a production line having the features of claim 12.
Das vorliegende Verfahren ermöglicht demnach die Bereitstellung von mit einer Dekorschicht versehenen Holzwerkstoffplatten in verschiedenen Formaten mit hoher Verschleißfestigkeit in einer kostengünstigen Weise. Gemäß dem vorliegenden Verfahren wird eine erste Harzschicht, insbesondere in Form einer ersten duroplastischen Harzschicht, wie einer Melamin-Formaldehyd-Harzschicht, auf die Dekorschicht (vorbehandelt oder nichtvorbehandelt) der Holzwerkstoffplatte aufgebracht. Es erfolgt zunächst kein Trocknen oder Antrocknen der ersten Harzschicht, sondern vielmehr werden die abriebfesten Partikeln auf die nasse bzw. noch flüssige erste Harzschicht auf der Oberseite der Holzwerkstoffplatte gleichmäßig unter Verwendung einer geeigneten Streuvorrichtung aufgestreut. Da die erste Harzschicht zum Zeitpunkt des Aufstreuens noch flüssig vorliegt, können die abriebfesten Partikel in die Harzschicht einsinken. Erst nach dem Aufstreuen der abriebfesten Partikel auf die erste Harzschicht erfolgt ein Trocknungsschritt z.B. unter Verwendung eines Umlufttrockners, wobei es zu einer Fixierung der abriebfesten Partikel in der mindestens einen ersten Harzschicht kommt.The present method thus makes it possible to provide wood-based panels provided with a decorative layer in various formats with high wear resistance in a cost-effective manner. According to the present method, a first resin layer, in particular in the form of a first thermosetting resin layer, such as a melamine-formaldehyde resin layer, is applied to the decorative layer (pretreated or not pretreated) of the wood-based panel. There is initially no drying or drying of the first resin layer, but rather the abrasion-resistant particles are sprinkled evenly onto the wet or still liquid first resin layer on top of the wood-based panel using a suitable scattering device. Because the first Resin layer is still liquid at the time of scattering, the abrasion-resistant particles can sink into the resin layer. Only after the abrasion-resistant particles have been sprinkled onto the first resin layer is a drying step carried out, for example, using a circulating-air dryer, whereby the attrition-resistant particles in the at least one first resin layer are immobilized.
Wie noch weiter unten im Detail erläutert, können mit der im vorliegenden Verfahren verwendeten Streuvorrichtung bzw. Streuapparatur auch andere streufähige Materialien (wie Glaskugeln, Zellulosefasern, Holzfasern usw.) aufgestreut werden können. Durch das Streuen des gesamten abriebfesten Materials (wie Korund) in einer Schicht, statt des Mehrfachauftrages mit Hilfe der Auftragswalzen, kann die Schicht aus abriebfesten Material deutlich besser mit darauffolgenden Harzschichten gegen das Pressblech abgesperrt werden. Damit wird der Blechverschleiß reduziert. Dies wird auch durch die geringere Auftragsmenge erreicht, die benötigt wird, um eine bestimmte Abriebfestigkeit zu erreichen.As explained in more detail below, other scatterable materials (such as glass beads, cellulose fibers, wood fibers, etc.) can be sprinkled with the spreader or spreader used in the present process. By scattering the entire abrasion-resistant material (such as corundum) in one layer, instead of the multiple application using the applicator rollers, the layer of abrasion-resistant material can be significantly better sealed off with subsequent resin layers against the press plate. This reduces sheet metal wear. This is also achieved by the lower application rate needed to achieve a certain abrasion resistance.
Mit dem vorliegenden Verfahren ist eine Reduzierung des Verbrauchs an abriebfesten Material möglich, der Anlagenverschleiß wie z.B. Verschleiß des Pressbleches in der Presse oder der Harzzuleitungen wird reduziert, der Auftrag an abriebfesten Material auf die Holzwerkstoffplatte ist gleichmäßiger, die Transparenz ist verbessert. Insgesamt werden die Verfahrenskosten aufgrund reduzierter Material- und Wartungskosten verringert. Zusätzlich wird die Mengenbestimmung des aufgetragenen abriebfesten Materials und damit auch die Qualitätskontrolle vereinfacht, wie weiter unten noch im Detail erläutert.With the present method, it is possible to reduce the consumption of abrasion-resistant material, to reduce equipment wear, e.g. Wear of the press plate in the press or the resin feed lines is reduced, the application of abrasion-resistant material to the wood-based panel is more uniform, the transparency is improved. Overall, the process costs are reduced due to reduced material and maintenance costs. In addition, the quantity determination of the applied abrasion-resistant material and thus also the quality control is simplified, as explained in more detail below.
Die Menge der auf die Oberseite der Holzwerkstoffplatte aufgetragenen ersten Harzschicht kann zwischen 50-100 g/m2, bevorzugt 60-80 g/m2, insbesondere bevorzugt 70 g/m2 betragen.The amount of the first resin layer applied to the upper side of the wood-based panel may be between 50-100 g / m 2 , preferably 60-80 g / m 2 , particularly preferably 70 g / m 2 .
Die Menge der auf die Unterseite der Holzwerkstoffplatte aufgetragenen ersten Harzschicht kann zwischen 50-100 g/m2, bevorzugt 60-80 g/m2, insbesondere bevorzugt 60 g/m2 betragen. Bevorzugt ist die erste untere Harzschicht (z.B. bräunlich) eingefärbt, um einen Gegenzug zu simulieren.The amount of the first resin layer applied to the underside of the wood-based panel may be between 50-100 g / m 2 , preferably 60-80 g / m 2 , particularly preferably 60 g / m 2 . Preferably, the first lower resin layer (eg brownish) is colored to simulate a counter-pull.
Der Feststoffgehalt des für die erste Harzschicht verwendeten Harzes liegt sowohl für die Oberseite als auch die Unterseite bei 50-70 Gew%, bevorzugt 50-60 Gew%, insbesondere bevorzugt 55 Gew%.The solid content of the resin used for the first resin layer is 50-70% by weight, preferably 50-60% by weight, more preferably 55% by weight for both the top and the bottom.
Die erste Harzschicht wird bevorzugt parallel bzw. gleichzeitig auf die Oberseite und Unterseite der Holzwerkstoffplatte in mindestens einer Doppelauftragsvorrichtung (Walzenauftragsaggregat) aufgetragen.The first resin layer is preferably applied parallel or simultaneously to the top and bottom of the wood-based panel in at least one double application device (roller application unit).
Die auf der Unterseite aufgetragenen Harzschichten wirken als Gegenzug. Durch das Aufbringen der Harzschichten auf die Oberseite und Unterseite der Holzwerkstoffplatten in ungefähr den gleichen Mengen wird gewährleistet, dass die durch die aufgebrachten Schichten beim Verpressen entstehenden Zugkräfte auf die Holzwerkstoffplatte sich gegenseitig aufheben. Der auf die Unterseite aufgebrachte Gegenzug entspricht im Schichtaufbau und der jeweiligen Schichtdicke ungefähr der auf der Oberseite aufgebrachten Schichtfolge mit dem Unterschied der abriebfesten Partikel und Glaskugeln wie im Folgenden im Detail erläutert wird.The applied on the bottom resin layers act in return. By applying the resin layers on the top and bottom of the wood-based panels in approximately the same amounts ensures that the resulting by the applied layers during compression tensile forces on the wood-based panel cancel each other. The counter-coating applied to the underside corresponds in layer construction and the respective layer thickness approximately to the layer sequence applied on the upper side with the difference of the abrasion-resistant particles and glass spheres, as explained in detail below.
Die zur Erhöhung der Verschleißfestigkeit verwendeten abriebfesten Partikel umfassen bevorzugt Korund (Aluminiumoxide), Borcarbide, Siliziumdioxide, Siliziumcarbide, wobei die Verwendung von Korund besonders bevorzugt ist.The abrasion-resistant particles used to increase the wear resistance preferably comprise corundum (aluminum oxides), boron carbides, silicon dioxides, silicon carbides, the use of corundum being particularly preferred.
In einer Ausführungsform beträgt die Menge an aufgestreuten abriebfesten Partikeln 10 bis 50 g/m2, bevorzugt 10 bis 30 g/m2, insbesondere bevorzugt 15 bis 25 g/m2. So können z.B. 14 g/m2 oder 23 g/m2 an abriebfesten Partikel aufgestreut werden.In one embodiment, the amount of scattered abrasion-resistant particles is 10 to 50 g / m 2 , preferably 10 to 30 g / m 2 , particularly preferably 15 to 25 g / m 2 . Thus, for example, 14 g / m 2 or 23 g / m 2 of abrasion-resistant particles can be scattered.
Die Bestimmung der aufgetragenen Menge an abriebfesten Material auf die Holzplatte kann in einfacher und genauer Weise vorgenommen werden. Dies kann durch einfaches Unterstellen von einer oder mehrerer flacher Schalen unterhalb der Streuvorrichtung bzw. des Streuaggregates erfolgen. Anschließend wird die Streuvorrichtung für einen bestimmten definierten Zeitraum laufengelassen, die in den Schalen aufgefangene Menge an abriebfesten Material wird ausgewogen und die ausgewogene Menge an abriebfesten Material durch den Anlagenvorschub geteilt. Damit kann z. B. einfach die Abweichung zwischen links - Mitte - rechts bestimmt werden, wobei die Streugenauigkeit der Streuvorrichtung bei +/-1 g/m2 in der Breite liegen sollte.The determination of the applied amount of abrasion resistant material on the wood panel can be made in a simple and accurate manner. This can be done by simply placing one or more shallow trays beneath the spreader or spreader. Subsequently, the spreader is run for a certain defined period of time, the amount of abrasion resistant material collected in the trays is balanced and the balanced amount of abrasion resistant material is divided by the plant feed. This can z. B. the deviation between left - center - be determined right, the stray inaccuracy of the scattering device should be at +/- 1 g / m 2 in width.
Die Menge der auf die Oberseite der Holzwerkstoffplatte aufgetragenen zweiten Harzschicht kann zwischen 10-50 g/m2, bevorzugt 20-30 g/m2, insbesondere bevorzugt 25 g/m2 betragen.The amount of the second resin layer applied to the upper side of the wood-based panel may be between 10-50 g / m 2 , preferably 20-30 g / m 2 , particularly preferably 25 g / m 2 .
Die Menge der auf die Unterseite der Holzwerkstoffplatte aufgetragenen zweiten Harzschicht kann zwischen 30-80 g/m2, bevorzugt 40-60 g/m2, insbesondere bevorzugt bei 50 g/m2 liegen.The amount of the second resin layer applied to the underside of the wood-based panel may be between 30-80 g / m 2 , preferably 40-60 g / m 2 , particularly preferably 50 g / m 2 .
Der Feststoffgehalt des für die zweiten Harzschicht verwendeten Harzes liegt sowohl für die Oberseite als auch die Unterseite bei 50-70 Gew%, bevorzugt 50-60 Gew%, insbesondere bevorzugt 55 Gew%. Erfindungsgemäß wird jeweils mindestens eine dritte Harzschicht auf die Oberseite und die Unterseite der Holzwerkstoffplatte, d.h. auf die jeweilige zweite (getrocknete) Harzschicht aufgetragen.The solid content of the resin used for the second resin layer is 50-70% by weight, preferably 50-60% by weight, more preferably 55% by weight for both the top and the bottom. In accordance with the invention, at least a third resin layer is applied to the top and bottom of the wood-based panel, i. applied to the respective second (dried) resin layer.
Die Menge der auf die Oberseite der Holzwerkstoffplatte aufgetragenen dritten Harzschicht kann zwischen 10-40 g/m2, bevorzugt 15-30 g/m2, insbesondere bevorzugt 20 g/m2 betragen, wobei der Feststoffgehalt zwischen 50-80 Gew%, bevorzugt 60-70 Gew%, insbesondere bevorzugt 60-65 Gew%, z.B. bei 61,5 Gew% liegt. Das als dritte Harzschicht auf die Oberseite der Holzwerkstoffplatte aufzutragende Harz enthält Glaskugeln, wobei die Glaskugeln bevorzugt als Abstandshalter fungieren. Die bevorzugt verwendeten Glaskugeln weisen einen Durchmesser von 50-100 µm, bevorzugt von 60-80 µm auf. Die Auftragsmenge der Glaskugeln, wenn diese zusammen mit der dritten Harzschicht aufgebracht werden, beträgt 1-5 g/m2, bevorzugt 2-4 g/m2, insbesondere bevorzugt 3 g/m2.The amount of the third resin layer applied to the upper side of the wood-based panel may be between 10-40 g / m 2 , preferably 15-30 g / m 2 , particularly preferably 20 g / m 2 , the solids content being between 50-80% by weight, preferably 60-70% by weight, particularly preferably 60-65% by weight, for example at 61.5% by weight. The resin to be applied as the third resin layer on top of the wood-based panel contains glass beads, the glass beads preferably acting as spacers. The glass beads preferably used have a diameter of 50-100 microns, preferably from 60-80 microns. The application amount of the glass beads, when applied together with the third resin layer, is 1-5 g / m 2 , preferably 2-4 g / m 2 , particularly preferably 3 g / m 2 .
In einer weiteren, nicht beanspruchten, Variante können die Glaskugeln auf die auf der Oberseite der Holzwerkstoffplatte aufgetragene dritte Harzschicht aufgestreut werden. In diesem Fall, d.h. wenn die Glaskugeln aufgestreut werden, beträgt die Auftragsmenge der Glaskugeln 5-10 g/m2, bevorzugt 6-8 g/m2, insbesondere bevorzugt 6 g/m2.In a further, not claimed, variant, the glass beads can be sprinkled onto the applied on the top of the wood-based panel third resin layer. In this case, ie, when the glass beads are scattered, the application amount of the glass beads is 5-10 g / m 2 , preferably 6-8 g / m 2 , particularly preferably 6 g / m 2 .
Die Menge der auf die Unterseite der Holzwerkstoffplatte aufgetragenen dritten Harzschicht kann zwischen 20-70 g/m2, bevorzugt 30-50 g/m2, insbesondere bevorzugt 40 g/m2 bei einem Feststoffgehalt von 50-70 Gew%, bevorzugt 50-60 Gew%, insbesondere bevorzugt 55 Gew% betragen. Die jeweils auf der Oberseite und Unterseite der Holzwerkstoffplatte aufgetragene dritte Harzschicht wird in mindestens einer Trocknungsvorrichtung getrocknet. Im Anschluss an den Trocknungsprozess für die dritte Harzschicht wird erfindungsgemäß jeweils mindestens eine vierte Harzschicht auf die Oberseite und die Unterseite der Holzwerkstoffplatte, d.h. auf die jeweilige dritte Harzschicht aufgetragen. Die Menge der auf die Oberseite der Holzwerkstoffplatte aufgetragenen vierten Harzschicht kann zwischen 10-40 g/m2, bevorzugt 15-30 g/m2, insbesondere bevorzugt 20 g/m2 bei einem Feststoffgehalt von 50-80 Gew%, bevorzugt 60-70 Gew%, insbesondere bevorzugt 60-65 Gew%, z.B. 61,6 Gew% betragen. Erfindungsgemäß enthält das als vierte Harzschicht auf die Oberseite der Holzwerkstoffplatte aufzutragende Harz Glaskugeln und/oder Fasern, insbesondere Holzfasern oder Zellulosefasern. Im Falle der Zugabe von Glaskugeln zum aufzutragenden Harz beträgt die Auftragsmenge an Glaskugeln 1-5 g/m2, bevorzugt 2-4 g/m2, insbesondere bevorzugt 3 g/m2. Die Auftragsmenge der Fasern, wie z.B. Zellulosefasern, beträgt, wenn diese zusammen mit der vierten Harzschicht aufgebracht werden, zwischen 0,1-0,5 g/m2, bevorzugt 0,2-0,4 g/m2, insbesondere bevorzugt 0,25 g/m2. Die Zugabe von Glaskugeln und/oder Fasern wie Zellulosefasern zu der obersten vierten Schicht trägt zur Verschleißfestigkeit der Holzwerkstoffplatte bei.The amount of the third resin layer applied to the underside of the wood-based panel may be between 20-70 g / m 2 , preferably 30-50 g / m 2 , particularly preferably 40 g / m 2 at a solids content of 50-70% by weight, preferably 50-70% by weight. 60% by weight, particularly preferably 55% by weight. The third resin layer applied in each case on the upper side and lower side of the wood-based panel is dried in at least one drying device. Following the drying process for the third resin layer, according to the invention at least one fourth resin layer is applied to the upper side and the lower side of the wood-based panel, ie to the respective third resin layer. The amount of the fourth resin layer applied to the upper side of the wood-based panel may be between 10-40 g / m 2 , preferably 15-30 g / m 2 , particularly preferably 20 g / m 2 at a solids content of 50-80% by weight, preferably 60-80% by weight. 70% by weight, particularly preferably 60-65% by weight, for example 61.6% by weight. According to the invention, the resin to be applied as the fourth resin layer on top of the wood-based panel contains glass beads and / or fibers, in particular wood fibers or cellulose fibers. In the case of adding glass beads to the resin to be applied, the application amount of glass beads is 1-5 g / m 2 , preferably 2-4 g / m 2 , particularly preferably 3 g / m 2 . The application amount of the fibers, such as cellulose fibers, when applied together with the fourth resin layer, is between 0.1-0.5 g / m 2 , preferably 0.2-0.4 g / m 2 , particularly preferably 0 , 25 gsm. The addition of glass beads and / or fibers such as cellulose fibers to the uppermost fourth layer contributes to the wear resistance of the wood-based panel.
Die Menge der auf die Unterseite der Holzwerkstoffplatte aufgetragenen vierten Harzschicht kann zwischen 10-60 g/m2, bevorzugt 20-50 g/m2, insbesondere bevorzugt 30 g/m2 bei einem Feststoffgehalt von 50-70 Gew%, bevorzugt 50-60 Gew%, insbesondere bevorzugt 55 Gew% liegen.The amount of the fourth resin layer applied to the underside of the wood-based panel may be between 10-60 g / m 2 , preferably 20-50 g / m 2 , particularly preferably 30 g / m 2 at a solids content of 50-70% by weight, preferably 50-70% by weight. 60% by weight, particularly preferably 55% by weight.
Es ist noch anzumerken, dass sämtlichen Harzschichten jeweils weitere Additive, wie Härter, Netzmittel, Entschäumer und/oder Trennmittel zugegeben werden können.It should also be noted that it is possible to add further additives, such as hardeners, wetting agents, defoamers and / or release agents, to all resin layers.
Die jeweils auf der Oberseite und Unterseite der Holzwerkstoffplatte aufgetragene vierte Harzschicht wird abschließend in mindestens einer weiteren Trocknungsvorrichtung getrocknet. Das Trocknen der jeweiligen Harzschichten erfolgt bevorzugt auf eine Restfeuchte von 6-9 Gew% z.B. in einem Umlufttrockner.The fourth resin layer, which is applied on the upper side and lower side of the wood-based panel, is finally dried in at least one further drying device. The drying of the respective resin layers is preferably carried out to a residual moisture of 6-9% by weight, for example in a circulating air dryer.
In dem sich an den letzten Trocknungsschritt anschließenden Pressschritt erfolgt ein Verpressen des Schichtaufbaus unter Druck- und Temperatureinfluss in einer Kurztaktpresse bei Temperaturen zwischen 150 und 250°C, bevorzugt zwischen 180 und 230°C, insbesondere bevorzugt bei 200°C und einem Druck zwischen 100 und 1000 N/cm2, bevorzugt 300 und 700 N/cm2, insbesondere bevorzugt zwischen 400 und 600 N/cm2.In the pressing step following the last drying step, the layer structure is compressed under pressure and temperature in a short-cycle press at temperatures between 150 and 250 ° C., preferably between 180 and 230 ° C., particularly preferably at 200 ° C. and a pressure between 100 and 1000 N / cm 2 , preferably 300 and 700 N / cm 2 , particularly preferably between 400 and 600 N / cm 2 .
In einer Variante des vorliegenden Verfahrens wird als Holzwerkstoffplatte bzw. als Trägerplatte eine mitteldichte Faser (MDF), hochdichte Faser (HDF), Grobspan (OSB) oder Sperrholzplatte, eine Zementfaserplatte und/oder Gipsfaserplatte, eine Holz-Kunststoff-Platte, insbesondere eine Wood Plastic Composite (WPC)-Platte verwendet.In a variant of the present method is as a wood-based panel or as a support plate medium density fiber (MDF), high density fiber (HDF), coarse chip (OSB) or plywood, a cement fiber board and / or gypsum fiber board, a wood-plastic plate, in particular a Wood Plastic Composite (WPC) plate used.
Die bereits oben erwähnte Dekorschicht kann mittels Direktdruck aufgetragen werden. Im Falle eines Direktdruckes erfolgt der Auftrag einer wasserbasierten, pigmentierten Druckfarbe im Tiefdruck- oder im Digitaldruckverfahren, wobei die wasserbasierte pigmentierte Druckfarbe in mehr als einer Schicht auftragbar ist, z.B. in Form von zwei bis zehn Schichten, bevorzugt drei bis acht Schichten.The above-mentioned decorative layer can be applied by direct printing. In the case of direct printing, the application of a water-based, pigmented ink by gravure or digital printing, wherein the water-based pigmented ink is applied in more than one layer, e.g. in the form of two to ten layers, preferably three to eight layers.
Im Falle des Direktdrucks erfolgt der Auftrag der mindestens einen Dekorschicht wie erwähnt mittels eines analogen Tiefdruck- und/oder eines Digitaldruckverfahrens. Das Tiefdruckverfahren ist eine Drucktechnik, bei der die abzubildenden Elemente als Vertiefungen einer Druckform vorliegen, die vor dem Druck eingefärbt wird. Die Druckfarbe befindet sich vornehmlich in den Vertiefungen und wird aufgrund des Anpressdruckes der Druckform und von Adhäsionskräften auf den zu bedruckenden Gegenstand, wie z.B. eine Holzfaserträgerplatte, übertragen. Hingegen wird beim Digitaldruck das Druckbild direkt von einem Computer in eine Druckmaschine, wie z.B. einen Laserdrucker oder Tintenstrahldrucker übertragen. Dabei entfällt die Verwendung einer statischen Druckform. In beiden Verfahren ist die Verwendung von wässrigen Farben und Tinten oder farbgebender Mittel auf UV-Basis möglich. Ebenfalls ist es vorstellbar, die genannten Drucktechniken aus Tief- und Digitaldruck zu kombinieren. Eine geeignete Kombination der Drucktechniken kann zum einen unmittelbar auf der Trägerplatte bzw. der zu bedruckenden Schicht erfolgen oder auch vor dem Drucken durch Anpassung der verwendeten elektronischen Datensätze.In the case of direct printing, the application of the at least one decorative layer takes place as mentioned by means of an analogue gravure printing 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 of a printing form, which is inked before printing. The ink is located primarily in the recesses and is due to the pressure of the printing plate and adhesive forces on the object to be printed, such as. a wood fiber support plate, transferred. On the other hand, in digital printing, the print image is transferred directly from a computer to a printing press, such as a press. transmit a laser printer or inkjet printer. This eliminates the use of a static printing form. Both methods allow the use of aqueous inks and inks or UV-based colorants. It is also conceivable to combine the mentioned printing techniques from gravure and digital printing. A suitable combination of the printing techniques can be done either directly on the support plate or the layer to be printed or even before printing by adjusting the electronic records used.
Es ist ebenfalls möglich, dass zwischen der Holzwerkstoffplatte bzw. Trägerplatte und der mindestens einen Dekorschicht mindestens eine Grundierungsschicht angeordnet ist.It is also possible that at least one primer layer is arranged between the wood-based material board or carrier plate and the at least one decorative layer.
Die dabei bevorzugt verwendete Grundierungsschicht umfasst eine Zusammensetzung aus Kasein als Bindemittel und anorganische Pigmente, insbesondere anorganische Farbpigmente. Als Farbpigmente können in der Grundierungsschicht weiße Pigmente wie Titandioxid verwendet werden oder aber auch weitere Farbpigmente, wie Calciumcarbonat, Bariumsulfat oder Bariumcarbonat. Die Grundierung kann neben den Farbpigmenten und dem Kasein noch Wasser als Lösemittel enthalten. Es ist ebenfalls bevorzugt, wenn die aufgetragene pigmentierte Grundschicht aus mindestens einer, bevorzugt aus mindestens zwei, insbesondere bevorzugt aus mindestens vier nacheinander aufgetragenen Lagen bzw. Aufträgen besteht, wobei die Auftragsmenge zwischen den Lagen bzw. Aufträgen gleich oder verschieden sein kann.The primer layer preferably used here comprises a composition of casein as binder and inorganic pigments, in particular inorganic color pigments. As color pigments, white pigments such as titanium dioxide can be used in the primer layer, or else further color pigments, such as calcium carbonate, barium sulfate or barium carbonate. The primer may contain water as a solvent in addition to the color pigments and casein. It is likewise preferred if the applied pigmented basecoat comprises at least one, preferably at least two, more preferably at least four, successively applied layers or jobs, the application quantity between the layers or applications being the same or different.
Das vorliegende Verfahren ermöglicht somit die Herstellung einer abriebfesten Holzwerkstoffplatte mit mindestens einer Dekorschicht auf der Oberseite, mindestens einer ersten Harzschicht auf der Oberseite und Unterseite, mindestens einer Schicht aus abriebfesten Partikel auf und / oder in der ersten Harzschicht auf der Oberseite, und mindestens einer zweite Harzschicht auf der Oberseite und Unterseite der Holzwerkstoffplatte. Erfindungsgemäß sind mindestens eine dritte und vierte Harzschicht auf der Oberseite und Unterseite der Holzwerkstoffplatte vorgesehen, wobei in der auf der Oberseite der Holzwerkstoffplatte vorgesehenen dritten und vierten Harzschicht jeweils Glaskugeln bzw. Glaskugeln und/oder Fasern, insbesondere Zellulosefasern, enthalten sind. In einer bevorzugten Ausführungsform ermöglicht das vorliegende Verfahren die Herstellung einer abriebfesten Holzwerkstoffplatte mit folgendem Schichtaufbau (von unten nach oben gesehen):
Gegenzug aus vier Harzschichten - Trägerplatte - Grundierungsschicht - Druckdekorschicht - erste Harzschicht - Schicht aus abriebfesten Partikeln - zweite Harzschicht - dritte Harzschicht mit Glaskugeln - vierte Harzschicht mit Glaskugeln und/oder Zellulosefasern.The present method thus makes it possible to produce an abrasion-resistant wood-based panel with at least one decorative layer on the upper side, at least one first resin layer on the upper side and underside, at least one layer of abrasion-resistant particles on and / or in the first resin layer on the upper side, and at least one second Resin layer on the top and bottom of the wood-based panel. According to the invention, at least a third and fourth resin layer are provided on the upper side and lower side of the wood-based panel, glass balls or glass beads and / or fibers, in particular cellulose fibers, being contained in the third and fourth resin layer provided on the upper side of the wood-based panel. In a preferred embodiment, the present method makes it possible to produce an abrasion-resistant wood-based panel with the following layer structure (seen from the bottom upwards):
Backing of four resin layers - backing plate - primer layer - print decor layer - first resin layer - layer of abrasion-resistant particles - second resin layer - third resin layer with glass beads - fourth resin layer with glass beads and / or cellulose fibers.
Die Produktionslinie zur Durchführung des vorliegenden Verfahrens umfasst folgende Elemente:
- mindestens eine erste Auftragsvorrichtung zum Auftragen einer ersten Harzschicht auf die Oberseite und Unterseite der Trägerplatte,
- mindestens eine in Verarbeitungsrichtung hinter der ersten Auftragsvorrichtung angeordnete Vorrichtung zum Aufstreuen einer vorbestimmten Menge an abriebfesten Partikeln;
- mindestens eine in Verarbeitungsrichtung hinter der ersten Auftragsvorrichtung und Streuvorrichtung angeordnete erste Trocknungsvorrichtung zum Trocknen der ersten oberen und unteren Harzschicht;
- mindestens eine in Verarbeitungsrichtung hinter der ersten Trocknungsvorrichtung angeordnete zweite Auftragsvorrichtung zum Auftragen einer zweiten Harzschicht auf die Oberseite und Unterseite der Trägerplatte,
- mindestens eine in Verarbeitungsrichtung hinter der zweiten Auftragsvorrichtung angeordnete zweite Trocknungsvorrichtung zum Trocknen der zweiten oberen und unteren Harzschicht;
- mindestens eine in Verarbeitungsrichtung hinter der zweiten Trocknungsvorrichtung angeordnete dritte Auftragsvorrichtung zum Auftragen einer dritten Harzschicht auf die Oberseite, die Glaskugeln enthält, und Unterseite der Trägerplatte (ohne Glaskugeln),
- mindestens eine in Verarbeitungsrichtung hinter der dritten Auftragsvorrichtung angeordnete dritte Trocknungsvorrichtung zum Trocknen der dritten oberen und unteren Harzschicht;
- mindestens eine in Verarbeitungsrichtung hinter der dritten Trocknungsvorrichtung angeordnete vierte Auftragsvorrichtung zum Auftragen einer vierten Harzschicht, die Glaskugeln und/oder Fasern enthält, auf die Oberseite und Unterseite der Trägerplatte (ohne Glaskugeln oder Fasern);
- mindestens eine in Verarbeitungsrichtung hinter der vierten Auftragsvorrichtung angeordnete vierten Trocknungsvorrichtung zum Trocknen der vierten oberen und unteren Harzschicht; und
- mindestens eine in Verarbeitungsrichtung hinter der vierten Trocknungsvorrichtung angeordnete Kurztaktpresse.
- at least one first application device for applying a first resin layer to the top side and underside of the carrier plate,
- at least one downstream of the first applicator device arranged in the processing direction for spreading a predetermined amount of abrasion-resistant particles;
- at least one first drying device arranged behind the first application device and scattering device in the processing direction for drying the first upper and lower resin layer;
- at least one downstream in the processing direction behind the first drying device arranged second application device for applying a second resin layer on the top and bottom of the support plate,
- at least one second drying device arranged after the second application device in the processing direction for drying the second upper and lower resin layer;
- at least one third application device arranged behind the second drying device in the processing direction for applying a third resin layer to the upper side, which contains glass spheres, and underside of the carrier plate (without glass spheres),
- at least one third drying device arranged behind the third application device in the processing direction for drying the third upper and lower resin layer;
- at least one downstream in the processing direction downstream of the third drying device arranged fourth applicator for applying a fourth resin layer containing glass beads and / or fibers, on the top and bottom of the support plate (without glass beads or fibers);
- at least one fourth drying device arranged after the fourth application device in the processing direction for drying the fourth upper and lower resin layers; and
- at least one short-cycle press arranged in the processing direction behind the fourth drying device.
Die Streuapparatur bzw. Streuvorrichtung ist demnach in einer Produktionslinie installiert in der über mehrere Walzenauftragswerke wässrige Harze auf grundierte und bedruckte Platten aufgetragen werden können. Zu Beginn des Prozess wird auf vereinzelte Platten ein Harzstrich aufgebracht, in das anschließend das abriebfeste Material wie Korund mit der Streuvorrichtung aufgestreut wird.The spreader or scattering device is therefore installed in a production line in which aqueous resins can be applied to primed and printed plates via several roller applicators. At the beginning of the process, a resin coating is applied to individual plates, into which the abrasion-resistant material such as corundum is then sprinkled with the spreader.
Die in der vorliegenden Produktionslinie vorgesehene Streuvorrichtung ist geeignet zum Streuen von Pulver, Granula, Fasern und umfasst ein oszillierendes Bürstensystem. Die Streuvorrichtung besteht im Wesentlichen aus einem Vorratstrichter, einer sich drehenden, strukturierten Walze und einem Abstreifer. Dabei wird über die Drehgeschwindigkeit der Walze die Auftragsmenge an abriebfesten Material bestimmt.The spreader provided in the present production line is suitable for spreading powder, granules, fibers and comprises an oscillating brush system. The spreader consists essentially of a storage hopper, a rotating, structured roller and a scraper. In this case, the order quantity of abrasion-resistant material is determined by the rotational speed of the roller.
In einer Ausführungsform der vorliegenden Produktionslinie ist zudem vorgesehen, dass die mindestens einen Streuvorrichtung von mindestens einer Kabine, die mit mindestens einem Mittel zum Entfernen von in der Kabine auftretenden Stäuben versehen ist, umgeben ist bzw. in dieser angeordnet ist. Das Mittel zum Entfernen der Stäube kann in Form einer Absaugvorrichtung oder auch als Vorrichtung zum Einblasen von Luft ausgebildet sein. Das Einblasen von Luft kann über Düsen erreicht werden, die am Plattenein- und auslauf installiert sind und Luft in die Kabine einblasen. Zusätzlich können diese verhindern, dass durch Luftbewegungen ein inhomogener Streuvorhang an abriebfesten Material entsteht.In one embodiment of the present production line it is additionally provided that the at least one scattering device is surrounded by at least one cabin provided with at least one means for removing dusts occurring in the cabin. The means for removing the dust may be in the form of a suction device or as a device for blowing in air. The injection of air can be achieved through nozzles installed at the plate inlet and outlet, which inject air into the cabin. In addition, these can prevent air movements from creating an inhomogeneous curtain of abrasion-resistant material.
Die Entfernung des Staubes aus abriebfesten Material aus der Umgebung der Streuvorrichtung ist vorteilhaft, da neben der offensichtlich gesundheitlichen Belastung für die an der Produktionslinie tätigen Arbeiter der Feinstaub aus abriebfesten Partikeln sich auch auf anderen Anlagenteilen der Produktionslinie ablegt und zu erhöhten Verschleiß der selbigen führt. Die Anordnung der Streuvorrichtung in einer Kabine dient daher nicht nur der Reduzierung der gesundheitlichen Staubbelastung der Umgebung der Produktionslinie sondern beugt auch einem vorzeitigen Verschleiß vor.The removal of the dust from abrasion-resistant material from the environment of the spreader is advantageous because in addition to the apparent health burden for working on the production line workers of particulate matter from abrasion-resistant particles deposits on other parts of the production line and leads to increased wear of the same. The arrangement of the scattering device in a cabin therefore not only serves to reduce the health dust load of the environment of the production line but also prevents premature wear.
Die Streuvorrichtung wird bevorzugterweise durch eine Lichtschranke gesteuert, wobei die Lichtschranke in Verarbeitungsrichtung vor der unterhalb der Streuvorrichtung vorgesehenen Walze (Streuwalze) angeordnet ist. Die Steuerung der Streuvorrichtung durch eine Lichtschranke ist sinnvoll, das sich zwischen den einzelnen Holzwerkstoffplatten mehr oder weniger große Lücken befinden, Diese startet den Streuprozess sobald sich eine Platte vor der Streuwalze befindet.The scattering device is preferably controlled by a light barrier, the light barrier being arranged in the processing direction in front of the roller (scattering roller) provided below the scattering device. The control of the spreader by a Photoelectric sensor makes sense that between the individual wood-based panels more or less large gaps are. This starts the scattering process as soon as a plate is in front of the scattering roller.
In einer Ausführungsform der vorliegenden Streuvorrichtung ist vor der Streuwalze mindestens ein Trichter zum Auffangen von überschüssigen abriebfesten Partikeln (d.h. nicht auf der mindestens einen Holzwerkstoffplatte aufgestreuten, sondern vielmehr vor dem Einfahren der Holzwerkstoffplatte mit Hilfe der Transportvorrichtung unter die Streuwalze vor derselbigen herunterfallende abriebfeste Partikel) vorgesehen.In one embodiment of the present scattering device, at least one funnel for collecting excess abrasion-resistant particles (ie not scattered on the at least one wood-based panel, but rather before the retraction of the wood-based panel by means of the transport device under the scattering roller before derselbigen falling-off abrasion-resistant particles) is provided in front of the scattering roller ,
In einer weitergehenden Variante ist der Trichter mit mindestens einer Fördereinrichtung und einer Siebvorrichtung gekoppelt, wobei das in dem Trichter aufgefangene überschüssige abriebfeste Material über die Fördereinrichtung zu der Siebvorrichtung transportiert wird. Die Siebmaschen der Siebvorrichtung entsprechen dem größten verwendeten Korn des abriebfesten Partikelmaterials (d.h. ca. 80-100 µm). In der Siebvorrichtung werden Schmutzpartikel und verklumptes Material (wie verklumptes Harz oder verklumptes abriebfestes Material) von dem aufgefangenen abriebfesten Material abgetrennt und das gesiebte abriebfeste Material kann in die Streuvorrichtung zurückgeführt (recycelt) werden.In a further variant, the hopper is coupled to at least one conveyor and a screening device, wherein the collected in the hopper excess abrasion resistant material is transported via the conveyor to the screening device. The screen meshes of the screening device correspond to the largest grain used of the abrasion resistant particulate material (i.e., about 80-100 μm). In the sifter, debris and clumped material (such as clumped resin or clumped abrasion resistant material) is separated from the collected abrasion resistant material, and the sieved abrasion resistant material can be recycled to the spreader.
Die Erfindung wird nachfolgend unter Bezugnahme auf die Figuren der Zeichnungen an einem Ausführungsbeispiel näher erläutert. Es zeigen:
- Figur 1
- eine schematische Darstellung einer Produktionslinie einer Holzwerkstoffplatte unter Verwendung des erfindungsgemäßen Verfahrens.
- FIG. 1
- a schematic representation of a production line of a wood-based panel using the method according to the invention.
Die in der
Nach der ersten Auftragswalze 1 ist zudem eine erste Streuvorrichtung 10 zum gleichmäßigen Aufstreuen des abriebfesten Materials wie z.B. Korund auf die erste Harzschicht auf der Oberseite der HDF-Platte vorgesehen. Die Trocknung der ersten Harzschicht erfolgt anschließend in dem ersten Konvektionstrockner 1a.After the first application roller 1, a
Es schließen sich ein zweites Doppelauftragswerk 2 zum Auftragen einer zweiten Harzschicht und ein zweiter Konvektionstrockner 2a zum Trocknet der zweiten Harzschicht an.This is followed by a second
Dem dritten Doppelauftragswerk 3 zum Auftrag der dritten Harzschicht kann eine weitere Streuvorrichtung 20 zum Auftrag von Glaskugeln auf die dritte Harzschicht nachgeordnet sein gefolgt von einem dritten Konvektionstrockner 3a zum Trocknen der dritten Harzschicht. Die Streuvorrichtung 20 für die Glaskugeln ist optional. Die Glaskugeln werden erfindungsgemäß zusammen mit der dritten Harzschicht aufgetragen. Nach Auftragen der vierten Harzschicht, die im Falle der vierten Harzschicht auf der Oberseite z.B. Zellulosefasern enthalten kann, in einem vierten Doppelauftragswerk 4 und Trocknen in einem vierten Konvektionstrockner 4a wird der Schichtaufbau in einer Kurztaktpresse 5 verpresst. Die verpressten Platten werden gekühlt und gelagert.The third
Ein Stapel bedruckter HDF (dunkles Holzdekor) wird vor der Produktionslinie vereinzelt und mit einer Geschwindigkeit von 28 m/min durch die Linie transportiert.A stack of printed HDF (dark wood decor) is separated in front of the production line and transported through the line at a speed of 28 m / min.
In einem ersten Walzenauftragsaggregat werden ca. 70 g Melaminharz fl. (Feststoffgehalt: 55 Gew%) die üblichen Hilfsstoffe enthaltend (Härter, Netzmittel usw.) auf die Plattenoberfläche aufgetragen. Auf die Plattenunterseite wird ebenfalls mit dem ersten Walzenauftragsaggregat ein Melaminharz aufgetragen (Auftragsmenge: 60 g Harz fl. /m2, Feststoffgehalt: ca. 55 Gew%).In a first roller application unit, about 70 g of melamine resin fl. (Solids content: 55% by weight) containing the usual auxiliaries (hardener, wetting agent, etc.) are applied to the plate surface. On the underside of the plate, a melamine resin is also applied with the first roller application unit (application rate: 60 g resin fl. / M 2 , solids content: about 55% by weight).
Danach werden auf die Oberfläche mit einer Streuapparatur 14 g Korund /m2 (F 200) aufgestreut. Durch einen Abstand von ca. 5 m bis zum Trockner wird es dem Korund ermöglicht in das Melaminharz einzusinken. Dann durchläuft die Platte einen Umlufttrockner. Danach wird eine Melamin-Harzschicht (Feststoffgehalt: 55 Gew%) in einer Menge von 25 g/m2 aufgetragen. Auch diese enthält die üblichen Hilfsstoffe. Auf die Plattenunterseite wird ebenfalls mit einem Walzenauftragsaggregat ein Melaminharz aufgetragen (Auftragsmenge: 50 g Harz fl./m2, Feststoffgehalt: ca. 55 Gew%). Wieder wird die Platte in einem Umlufttrockner getrocknet.Thereafter, 14 g of corundum / m 2 (F 200) are sprinkled onto the surface with a spreader. By a distance of about 5 m to the dryer, the corundum is allowed to sink into the melamine resin. Then the plate passes through a circulating air dryer. Thereafter, a melamine resin layer (solid content: 55% by weight) is applied in an amount of 25 g / m 2 . These also contain the usual auxiliaries. On the underside of the plate, a melamine resin is also applied with a roller application unit (application rate: 50 g of resin fl./m 2 , solids content: about 55% by weight). Again, the plate is dried in a circulating air dryer.
Danach wird auf die Plattenoberfläche ein Melaminharz aufgetragen, das zusätzlich noch Glaskugeln enthält. Diese haben einen Durchmesser von 60 - 80 µm. Die Auftragsmenge des Harzes liegt bei ca. 20 g Melaminharz fl./m2 (Feststoffgehalt: 61,5 Gew%). In der Rezeptur ist neben dem Harter und dem Netzmittel auch ein Trennmittel enthalten. Die Auftragsmenge an Glaskugeln liegt bei ca. 3 g/m2. Auf die Plattenunterseite wird ebenfalls mit einem Walzenauftragsaggregat ein Melaminharz aufgetragen (Auftragsmenge: 40 g Harz fl. /m2, Feststoffgehalt: ca. 55 Gew%). Die Platte wird wiederum in einem Umlufttrockner getrocknet und danach nochmals mit einem Melaminharz beschichtet, das Glaskugeln enthält. Als weitere Komponente ist Zellulose (Vivapur 302) enthalten. Es werden wiederum ca. 20 g Melaminharz fl./m2 (Feststoffgehalt: 61,6 Gew%) aufgetragen. Dabei werden wieder ca. 3 g Glaskugeln und 0,25 g Zellulose/m2 aufgetragen. In den Rezepturen ist neben dem Harter und dem Netzmittel auch ein Trennmittel enthalten. Auf die Plattenunterseite wird ebenfalls mit einem Walzenauftragsaggregat ein Melaminharz aufgetragen (Auftragsmenge: 30 g Harz fl. /m2, Feststoffgehalt: ca. 55 Gew%). Das Harz wird wiederum in einem Umlufttrockner getrocknet und danach wird die Platte in einer Kurztaktpresse bei 200°C und einem Druck von 400 N/cm2 verpresst. Die Presszeit betrug 10 Sekunden. Als Strukturgeber wurde ein Pressblech mit einer Holzstruktur verwendet.Thereafter, a melamine resin is applied to the plate surface, which additionally contains glass beads. These have a diameter of 60 - 80 microns. The application rate of the resin is about 20 g melamine resin fl./m 2 (solids content: 61.5% by weight). In addition to the hardener and the wetting agent, the formulation also contains a release agent. The order quantity of glass beads is about 3 g / m 2 . On the underside of the plate, a melamine resin is also applied with a roller application unit (application rate: 40 g resin fl. / M 2 , solids content: about 55% by weight). The plate is again dried in a circulating air dryer and then coated again with a melamine resin containing glass beads. Another component is cellulose (Vivapur 302). Again about 20 g of melamine resin fl./m 2 (solids content: 61.6% by weight) are applied. Again, about 3 g of glass beads and 0.25 g of cellulose / m 2 are applied. In addition to the hardener and the wetting agent, the formulas also contain a release agent. On the underside of the plate, a melamine resin is also applied with a roller application unit (application rate: 30 g of resin fl. / M 2 , solids content: about 55% by weight). The resin is again dried in a circulating air dryer and then the plate is pressed in a short-cycle press at 200 ° C and a pressure of 400 N / cm 2 . The pressing time was 10 seconds. The structural element used was a press plate with a wood structure.
Zum Vergleich wurde eine Platte verpresst, bei der der Korundauftrag über einen Walzenauftrag erfolgte. Die Auftragsmengen an Harz lagen auf dem gleichen Niveau wie bei der Platte, die mit Korund bestreut worden war. Die Auftragswerke 1 bis 2 enthielten dabei korundhaltige Rezepturen. In den letzten Auftragswerken enthielten die Harze Glaskugeln bzw. Glaskugeln und Zellulose. Durch eine gravimetrische Bestimmung wurde die Auftragsmenge mit ca. 20 g Korund/m2 ermittelt. Von beiden Proben wurde das Verhalten gegenüber Abriebbeanspruchung gemäß der DIN EN 15468 bestimmt. Die Transparenz der Oberfläche wurde visuell mit beurteilt. Dabei ergaben sich folgende Werte:
Ein Stapel bedruckter HDF (dunkles Holzdekor) wird vor der Produktionslinie vereinzelt und mit einer Geschwindigkeit von 28 m/min durch die Linie transportiert.A stack of printed HDF (dark wood decor) is separated in front of the production line and transported through the line at a speed of 28 m / min.
In einem ersten Walzenauftragsaggregat werden ca. 70 g Melaminharz fl. (Feststoffgehalt: 55 Gew%) die üblichen Hilfsstoffe enthaltend (Härter, Netzmittel usw.) auf die Plattenoberfläche aufgetragen. Auf die Plattenunterseite wird ebenfalls mit einem Walzenauftragsaggregat ein Melaminharz aufgetragen (Auftragsmenge: 60 g Harz fl. /m2, Feststoffgehalt: ca. 55 Gew%).In a first roller application unit, about 70 g of melamine resin fl. (Solids content: 55% by weight) containing the usual auxiliaries (hardener, wetting agent, etc.) are applied to the plate surface. On the underside of the plate, a melamine resin is also applied with a roller application unit (application rate: 60 g resin fl. / M 2 , solids content: about 55% by weight).
Danach werden auf die Oberfläche mit einer Streuapparatur 23 g Korund/m2 (F 200) aufgestreut. Durch einen Abstand von ca. 5 m bis zum Trockner wird es dem Korund ermöglicht, in das Melaminharz einzusinken. Dann durchläuft die Platte einen Umlufttrockner.23 g of corundum / m 2 (F 200) are sprinkled onto the surface with a spreading apparatus. By a distance of about 5 m to the dryer, the corundum is allowed to sink into the melamine resin. Then the plate passes through a circulating air dryer.
Danach wird eine zweite Melamin-Harzschicht (Feststoffgehalt: 55 Gew%) in einer Menge von 25 g/m2 aufgetragen. Auch diese enthält die üblichen Hilfsstoffe. Auf die Plattenunterseite wird ebenfalls mit einem Walzenauftragsaggregat ein zweites Melaminharz aufgetragen (Auftragsmenge: 50 g Harz fl. /m2, Feststoffgehalt: ca. 55 Gew%). Wieder wird die Platte in einem Umlufttrockner getrocknet.Thereafter, a second melamine resin layer (solid content: 55% by weight) is applied in an amount of 25 g / m 2 . These also contain the usual auxiliaries. On the underside of the plate, a second melamine resin is also applied with a roller application unit (application rate: 50 g resin fl. / M 2 , solids content: about 55% by weight). Again, the plate is dried in a circulating air dryer.
Im Anschluss an den Trockenprozess wird nochmals ein drittes Melaminharz mit einem Walzenaggregat aufgetragen. Die Auftragsmenge des Harzes liegt bei ca. 20 g Melaminharz fl./m2 (Feststoffgehalt: 61,5 Gew%). In der Rezeptur ist neben dem Harter und dem Netzmittel auch ein Trennmittel enthalten. Auf die Plattenunterseite wird ebenfalls mit einem Walzenauftragsaggregat ein drittes Melaminharz aufgetragen (Auftragsmenge: 40 g Harz fl. /m2, Feststoffgehalt: ca. 55 Gew%). Danach werden mit einem Streuaggregat ca. 6 g Glaskugeln/m2 aufgestreut. Diese hatten einen Durchmesser von 60 - 80 µm. Die Platte wird wiederum in einem Umlufttrockner getrocknet und danach nochmals mit einem vierten Melaminharz beschichtet, das Zellulose (Vivapur 302) enthält. Es werden wiederum ca. 20 g Melaminharz fl./m2 (Feststoffgehalt: 56,0 Gew%) aufgetragen. Dabei werden 0,25 g Zellulose /m2 aufgetragen. Auf die Plattenunterseite wird ebenfalls mit einem Walzenauftrags-aggregat ein viertes Melaminharz aufgetragen (Auftragsmenge: 30 g Harz fl./m2, Feststoffgehalt: ca. 55 Gew%). In den Rezepturen ist neben dem Harter und dem Netzmittel auch ein Trennmittel enthalten. Das Harz wird wiederum in einem Umlufttrockner getrocknet und danach wird die Platte in einer Kurztaktpresse bei 200°C und einem Druck von 400 N/cm2 verpresst. Die Presszeit betrug 10 Sekunden. Als Strukturgeber wurde ein Pressblech mit einer Holzstruktur verwendet.Following the drying process, a third melamine resin is applied again with a roll aggregate. The application rate of the resin is about 20 g melamine resin fl./m 2 (solids content: 61.5% by weight). In addition to the hardener and the wetting agent, the formulation also contains a release agent. A third melamine resin is also applied to the underside of the plate with a roller application unit (application rate: 40 g of resin fl. / M 2 , solids content: about 55% by weight). Thereafter, about 6 g of glass balls / m 2 are sprinkled with a scattering unit. These had a diameter of 60-80 microns. The plate is again dried in a circulating air dryer and then coated again with a fourth melamine resin containing cellulose (Vivapur 302). In turn, about 20 g of melamine resin fl./m 2 (solids content: 56.0% by weight) are applied. In this case, 0.25 g cellulose / m 2 are applied. A fourth melamine resin is also applied to the underside of the plate with a roller application unit (application rate: 30 g of resin fl./m 2 , solids content: about 55% by weight). In addition to the hardener and the wetting agent, the formulas also contain a release agent contain. The resin is again dried in a circulating air dryer and then the plate is pressed in a short-cycle press at 200 ° C and a pressure of 400 N / cm 2 . The pressing time was 10 seconds. The structural element used was a press plate with a wood structure.
Zum Vergleich wurde eine Platte verpresst, bei der der Korundauftrag über einen Walzenauftrag erfolgte. Die Auftragsmengen an Harz waren bei dieser Platte im Vergleich zu der, bei der das Korund gestreut worden war ca. 20 g/m2 (Feststoff) höher. Dabei wurde in den ersten drei Auftragswerken mit korundhaltigen Rezepturen gearbeitet. Im letzten Auftragswerk enthielt das Melaminharz Glaskugeln und Zellulose. Die Auftragsmengen der beiden Komponenten waren mit denen der gestreuten Platte vergleichbar. Durch eine gravimetrische Bestimmung wurde die Auftragsmenge mit ca. 30 g Korund/m2 ermittelt. Von beiden Proben wurde das Verhalten gegenüber Abriebbeanspruchung gemäß der DIN EN 15468 bestimmt. Die Transparenz der Oberfläche wurde visuell mit beurteilt. Dabei ergaben sich folgende Werte:
In einem Großversuch wurden 10 000 bedruckte HDF (Format: 5600 x 2070 mm, dunkles Holzdekor) vor der Produktionslinie vereinzelt und mit einer Geschwindigkeit von 28 m/min durch die Linie transportiert.In a large-scale test 10,000 printed HDFs (size: 5600 x 2070 mm, dark wood decor) were separated in front of the production line and transported through the line at a speed of 28 m / min.
In einem ersten Walzenauftragsaggregat werden ca. 70 g Melaminharz fl. (Feststoffgehalt: 55 Gew%) die üblichen Hilfsstoffe enthaltend (Härter, Netzmittel usw.) auf die Plattenoberfläche aufgetragen. Auf die Plattenunterseite wird ebenfalls mit einem Walzenauftragsaggregat ein Melaminharz aufgetragen (Auftragsmenge: 60 g Harz fl. /m2, Feststoffgehalt: ca. 55 Gew%).In a first roller application unit, about 70 g of melamine resin fl. (Solids content: 55% by weight) containing the usual auxiliaries (hardener, wetting agent, etc.) on the plate surface applied. A melamine resin is applied to the underside of the plate also with a roller application unit applied (application amount:. 60 g resin fl / m 2, solid content: about 55% by weight).
Danach werden auf die Oberfläche mit einer Streuapparatur 23 g Korund/m2 (F 200) aufgestreut. Durch einen Abstand von ca. 5 m bis zum Trockner wird es dem Korund ermöglicht, in das Melaminharz einzusinken. Dann durchläuft die Platte einen Umlufttrockner.23 g of corundum / m 2 (F 200) are sprinkled onto the surface with a spreading apparatus. By a distance of about 5 m to the dryer, the corundum is allowed to sink into the melamine resin. Then the plate passes through a circulating air dryer.
Danach wird eine zweite Melamin-Harzschicht (Feststoffgehalt: 55 Gew%) in einer Menge von 25 g/m2 aufgetragen. Auch diese enthält die üblichen Hilfsstoffe. Auf die Plattenunterseite wird ebenfalls mit einem Walzenauftragsaggregat ein zweites Melaminharz aufgetragen (Auftragsmenge: 50 g Harz fl. /m2, Feststoffgehalt: ca. 55 Gew%). Wieder wird die Platte in einem Umlufttrockner getrocknet.Thereafter, a second melamine resin layer (solid content: 55% by weight) is applied in an amount of 25 g / m 2 . These also contain the usual auxiliaries. On the underside of the plate, a second melamine resin is also applied with a roller application unit (application rate: 50 g resin fl. / M 2 , solids content: about 55% by weight). Again, the plate is dried in a circulating air dryer.
Im Anschluss an den Trockenprozess wird nochmals Melaminharz mit einem Walzenaggregat aufgetragen. Die Auftragsmenge des Harzes liegt bei ca. 20 g Melaminharz fl./m2 (Feststoffgehalt: 61,5 Gew%). In der Rezeptur ist neben dem Härter und dem Netzmittel auch ein Trennmittel enthalten. Auf die Plattenunterseite wird ebenfalls mit einem Walzenauftrags-aggregat ein Melaminharz aufgetragen (Auftragsmenge: 40 g Harz fl. /m2, Feststoffgehalt: ca. 55 Gew%). Danach werden mit einem Streuaggregat ca. 6 g Glaskugeln/m2 aufgestreut. Diese hatten einen Durchmesser von 60 - 80 µm. Die Platte wird wiederum in einem Umlufttrockner getrocknet und danach nochmals mit einem Melaminharz beschichtet, das Zellulose (Vivapur 302) enthält. Es werden wiederum ca. 20 g Melaminharz fl./m2 (Feststoffgehalt: 56,0 Gew%) aufgetragen. Dabei werden 0,25 g Zellulose/m2 aufgetragen. Auf die Plattenunterseite wird ebenfalls mit einem Walzenauftragsaggregat ein Melaminharz aufgetragen (Auftragsmenge: 30 g Harz fl. /m2, Feststoffgehalt: ca. 55 Gew%). In den Rezepturen ist neben dem Harter und dem Netzmittel auch ein Trennmittel enthalten. Das Harz wird wiederum in einem Umlufttrockner getrocknet und danach wird die Platte in einer Kurztaktpresse bei 200°C und einem Druck von 400 N/cm2 verpresst. Die Presszeit betrug 10 Sekunden. Als Strukturgeber wurde ein Pressblech mit einer Holzstruktur verwendet.Following the drying process, melamine resin is applied again with a roll aggregate. The application rate of the resin is about 20 g melamine resin fl./m 2 (solids content: 61.5% by weight). In addition to the hardener and the wetting agent, the formulation also contains a release agent. On the underside of the plate, a melamine resin is also applied with a roller application unit (application rate: 40 g resin fl. / M 2 , solids content: about 55% by weight). Thereafter, about 6 g of glass balls / m 2 are sprinkled with a scattering unit. These had a diameter of 60-80 microns. The plate is again dried in a circulating air dryer and then again coated with a melamine resin containing cellulose (Vivapur 302). In turn, about 20 g of melamine resin fl./m 2 (solids content: 56.0% by weight) are applied. In this case, 0.25 g cellulose / m 2 are applied. On the underside of the plate, a melamine resin is also applied with a roller application unit (application rate: 30 g of resin fl. / M 2 , solids content: about 55% by weight). In addition to the hardener and the wetting agent, the formulas also contain a release agent. The resin is again dried in a circulating air dryer and then the plate is pressed in a short-cycle press at 200 ° C and a pressure of 400 N / cm 2 . The pressing time was 10 seconds. The structural element used was a press plate with a wood structure.
Zum Vergleich wurden 10000 Platten verpresst, bei der der Korundauftrag über einen Walzenauftrag erfolgte. Die Auftragsmengen an Harz waren bei dieser Platte im Vergleich zu der, bei der das Korund gestreut worden war ca. 20 g/m2 (Feststoff) höher. Dabei wurde in den ersten drei Auftragswerken mit korundhaltigen Rezepturen gearbeitet. Im letzten Auftragswerk enthielt das Melaminharz Glaskugeln und Zellulose. Die Auftragsmengen der beiden Komponenten waren mit denen der gestreuten Platte vergleichbar. Durch eine gravimetrische Bestimmung wurde die Auftragsmenge mit ca. 30 g Korund/m2 ermittelt. Von beiden Proben wurde das Verhalten gegenüber Abriebbeanspruchung gemäß der DIN EN 15468 bestimmt. Die Transparenz der Oberfläche wurde visuell mit beurteilt. Dabei ergaben sich folgende Werte:
Claims (14)
- Method for producing an abrasion-resistant wood material board which has at least one decorative layer, in particular as a printed decoration, on the upper side, comprising the steps:- applying at least one first resin layer to the at least one decorative layer on the upper side and to the underside of the wood material board;- uniformly scattering abrasion-resistant particles onto the first resin layer on the upper side of the wood material board;- drying the first resin layer provided with the abrasion-resistant particles on the upper side, and the first resin layer on the underside of the wood material board in at least one drying device;- applying at least one second resin layer to the dried first resin layer provided with the abrasion-resistant particles on the upper side, and the dried first resin layer on the underside of the wood material board;- drying the second resin layer on the upper side and the underside of the wood material board respectively in at least one drying device;- applying at least one third resin layer to the upper side and the underside of the wood material board respectively, wherein the resin to be applied as third resin layer to the upper side of the wood material board contains glass spheres;- drying the third resin layer applied to the upper side and underside of the wood material board respectively in at least one drying device;- applying at least one fourth resin layer to the upper side and the underside of the wood material board respectively; wherein the resin to be applied as fourth resin layer to the upper side of the wood material board contains glass spheres and/or fibres;- drying the fourth resin layer applied to the upper side and the underside of the wood material board respectively in at least one drying device; and- pressing the layer structure.
- Method according to Claim 1, characterized in that the quantity of the first resin layer applied to the upper side of the wood material board is between 50-100 g/m2, preferably 60-80 g/m2, in particular preferably 70 g/m2.
- Method according to Claim 1 or 2, characterized in that the abrasion-resistant particles comprise particles made of corundum, boron carbide, silicon dioxide, silicon carbide.
- Method according to one of the preceding claims, characterized in that the quantity of abrasion-resistant particles scattered on is 10 to 50 g/m2, preferably 10 to 30 g/m2, in particular preferably 15 to 25 g/m2.
- Method according to one of the preceding claims, characterized in that the quantity of the second resin layer applied to the upper side of the wood material board is between 10-50 g/m2, preferably 20-30 g/m2, in particular preferably 25 g/m2.
- Method according to one of the preceding claims, characterized in that the quantity of the third resin layer applied to the upper side of the wood material board is between 10-40 g/m2, preferably 15-30 g/m2, in particular preferably 20 g/m2, wherein the solids content lies between 50-80% by weight, preferably 60-70% by weight, in particular preferably 60-65% by weight.
- Method according to one of the preceding claims, characterized in that the application quantity of the glass spheres, if these are applied together with third resin layer, is 1-5 g/m2, preferably 2-4 g/m2, in particular preferably 3 g/m2.
- Method according to one of the preceding claims, characterized in that the resin to be applied as fourth resin layer to the upper side of the wood material board contains wood fibres or cellulose fibres.
- Method according to one of the preceding claims, characterized in that the quantity of the fourth resin layer applied to the upper side of the wood material board is between 10-40 g/m2, preferably 15-30 g/m2, in particular preferably 20 g/m2, with a solids content of 50-80% by weight, preferably 60-70% by weight, in particular preferably 60-65% by weight.
- Method according to one of the preceding claims, characterized in that the glass spheres in the fourth resin layer are applied in a quantity of 1-5 g/m2, preferably 2-4 g/m2, in particular preferably 3 g/m2.
- Method according to one of the preceding claims, characterized in that the fibres in the fourth resin layer are applied in a quantity between 0.1-0.5 g/m2, preferably 0.2-0.4 g/m2, in particular preferably 0.25 g/m2.
- Production line for carrying out a method according to one of the preceding claims, comprising- at least one first application device for applying a first resin layer to the upper side and underside of the core board,- at least one device, arranged downstream as a first application device in the processing direction, for scattering a predetermined quantity of abrasion-resistant particles;- at least one first drying device, arranged downstream of the first application device and scattering device in the processing direction, for drying the first upper and lower resin layer;- at least one second application device, arranged downstream of the first drying device in the processing direction, for applying a second resin layer to the upper side and underside of the core board,- at least one second drying device, arranged downstream of the second application device in the processing direction, for drying the second upper and lower resin layer;- at least one third application device, arranged downstream of the second drying device in the processing direction, for applying a third resin layer to the upper side and underside of the core board, wherein the resin to be applied as third resin layer to the upper side of the wood material board contains glass spheres;- at least one third drying device, arranged downstream of the third application device in the processing direction, for drying the third upper and lower resin layer;- at least one fourth application device, arranged downstream of the third drying device in the processing direction, for applying a fourth resin layer to the upper side and underside of the core board, wherein the resin to be applied as fourth resin layer to the upper side of the wood material board contains glass spheres and/or fibres;- at least one fourth drying device, arranged downstream of the fourth application device in the processing direction, for drying the fourth upper and lower resin layer; and- at least one short-cycle press arranged downstream of the fourth drying device in the processing direction.
- Production line according to Claim 12, characterized in that the at least one scattering device is arranged in at least one booth, which is provided with at least one means for removing dust occurring in the booth.
- Wood material board that can be produced by a method according to one of Claims 1 to 11, comprising at least one decorative layer on the upper side, at least one first resin layer, applied in a quantity between 60 and 100 g/m2, on the upper side and underside, at least one layer of abrasion-resistant particles in the first resin layer on the upper side, at least one second resin layer on the upper side and underside of the wood material board, at least one third resin layer on the upper side and underside, wherein glass spheres are contained in the third resin layer on the upper side, and at least one fourth resin layer on the upper side and underside, wherein glass spheres and/or fibres are contained in the fourth resin layer on the upper side.
Priority Applications (13)
Application Number | Priority Date | Filing Date | Title |
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ES16170640.3T ES2686972T3 (en) | 2016-05-20 | 2016-05-20 | Procedure to manufacture a board of material derived from abrasion resistant wood and production line for it |
PL16170640T PL3246175T3 (en) | 2016-05-20 | 2016-05-20 | Method of producing an abrasion resistant wooden panel and production line for same |
PT16170640T PT3246175T (en) | 2016-05-20 | 2016-05-20 | Method of producing an abrasion resistant wooden panel and production line for same |
EP16170640.3A EP3246175B1 (en) | 2016-05-20 | 2016-05-20 | Method of producing an abrasion resistant wooden panel and production line for same |
CN201780030964.2A CN109153283A (en) | 2016-05-20 | 2017-05-04 | For manufacturing the method for wear-resisting composite timber board and for this production line |
EP17722725.3A EP3458281B1 (en) | 2016-05-20 | 2017-05-04 | Production line for producing an abrasion-resistant wood material panel |
RU2018138803A RU2716188C1 (en) | 2016-05-20 | 2017-05-04 | Method of producing wear-resistant plate based on wood materials and production line for implementation thereof |
PL17722725.3T PL3458281T3 (en) | 2016-05-20 | 2017-05-04 | Production line for producing an abrasion-resistant wood material panel |
UAA201811307A UA123788C2 (en) | 2016-05-20 | 2017-05-04 | Method for producing an abrasion-resistant wood material panel and production line therefor |
CN202111025962.9A CN113815343A (en) | 2016-05-20 | 2017-05-04 | Production line for carrying out a method for manufacturing a wear-resistant composite wood panel |
US16/099,547 US11192398B2 (en) | 2016-05-20 | 2017-05-04 | Method for producing an abrasion-resistant wood material panel and production line therefor |
PCT/EP2017/060710 WO2017198474A1 (en) | 2016-05-20 | 2017-05-04 | Method for producing an abrasion-resistant wood material panel and production line therefor |
US17/525,088 US11884097B2 (en) | 2016-05-20 | 2021-11-12 | Method for producing an abrasion-resistant wood material panel and production line therefor |
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EP16170640.3A EP3246175B1 (en) | 2016-05-20 | 2016-05-20 | Method of producing an abrasion resistant wooden panel and production line for same |
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EP3246175A1 EP3246175A1 (en) | 2017-11-22 |
EP3246175B1 true EP3246175B1 (en) | 2018-06-27 |
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EP16170640.3A Active EP3246175B1 (en) | 2016-05-20 | 2016-05-20 | Method of producing an abrasion resistant wooden panel and production line for same |
EP17722725.3A Active EP3458281B1 (en) | 2016-05-20 | 2017-05-04 | Production line for producing an abrasion-resistant wood material panel |
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EP17722725.3A Active EP3458281B1 (en) | 2016-05-20 | 2017-05-04 | Production line for producing an abrasion-resistant wood material panel |
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US (2) | US11192398B2 (en) |
EP (2) | EP3246175B1 (en) |
CN (2) | CN109153283A (en) |
ES (1) | ES2686972T3 (en) |
PL (2) | PL3246175T3 (en) |
PT (1) | PT3246175T (en) |
RU (1) | RU2716188C1 (en) |
UA (1) | UA123788C2 (en) |
WO (1) | WO2017198474A1 (en) |
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UA123788C2 (en) | 2021-06-02 |
EP3458281A1 (en) | 2019-03-27 |
PL3246175T3 (en) | 2019-03-29 |
CN109153283A (en) | 2019-01-04 |
PL3458281T3 (en) | 2024-05-13 |
EP3458281C0 (en) | 2023-12-20 |
EP3458281B1 (en) | 2023-12-20 |
WO2017198474A1 (en) | 2017-11-23 |
ES2686972T3 (en) | 2018-10-23 |
US11192398B2 (en) | 2021-12-07 |
US20220072897A1 (en) | 2022-03-10 |
PT3246175T (en) | 2018-10-22 |
CN113815343A (en) | 2021-12-21 |
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