巴西专利BR112012016752B1 construction panel

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专利摘要:
"PROJECT GENERATED BY HEAT AND PRESSURE". The invention relates to a wood fiber-based panel with surface layers with lower parts that comprise less binders than the upper parts. Also disclosed is a process for manufacturing a panel for construction that has a structured surface with a design that includes color variation in register with the structure obtained by a variation of pressure distribution applied on the surface.
公开号:BR112012016752B1
申请号:R112012016752-9
申请日:2010-12-22
公开日:2021-02-23
发明作者:Kent Lindgren；Göran Ziegler
申请人:Välinge Innovation AB；
IPC主号:

专利说明:

Technical Field
[001] The description refers in general to the field of fiber-based panels with wear-resistant surfaces for panel construction, preferably floor panels. The invention relates to panels for construction with such a wear-resistant surface and the production processes for the production of such panels. Background
[002] Laminate flooring typically consists of layers of different materials that are compressed under heat to form a laminated board. Typical layers are an alpha cellulose paper impregnated with melamine resin containing aluminum oxide, a printed decorative paper impregnated with melamine resin, a wood fiber based support plate (HDF) and a balance paper impregnated with resin of melamine. The product designs are typically obtained by stamping the laminated product with a structured plate or with a paper during the pressing operation and by printing the decorative paper with different designs and colors. Under typical process conditions, the depth of the structure is typically less than 0.2 mm to provide products that appear appropriate. Deeper structures tend to provide surface cracking due to insufficient pressure in parts of the plate area and limited stretch of the paper layers. To provide a product with an even more natural appearance, the printed paper and the stamped structure can be coordinated by providing products that are known in the field as registration stamping (EIR).
[003] Wood Fiber Flooring (WFF) is a new type of flooring product, described in WO2009 / 065769, which includes one or more layers of substantially homogeneous powder mixtures that are hot compressed in processes related to the processes used for obtaining laminate floors. Homogeneous powder mixtures typically include fibers such as wood fibers, polymer, such as formaldehyde melamine resin, hard particles, such as aluminum oxide particles and decorative materials, such as pigment particles, minerals and fibers. WFF products have an advantage over laminate floors, as there are no papers with limited stretching capacity, so very deep structures can be obtained without providing the observed cracking of the surface. Although under compression with heating the WFF powder mixture is almost liquid as in the sense that the composition flows under pressure to fill the cracks in the structure. Summary of the Invention
[004] In WFF, just as in laminate flooring, it is of great interest to obtain products with a natural appearance that have, for example, products that have color variations that match the variation of the structure. It was surprisingly discovered that such products can be obtained in WFF by variations in heat and pressure, providing the possibility to adjust the design in a controlled manner. Several methods for controlling the project are disclosed here below.
[005] By applying a pressure with a non-uniform distribution on the surface of a layer and given a fluidity of the layer, when the pressure is applied, which is sufficiently high, it is possible to cause parts of the composition in the layer to be displaced to the desired location. The fluidity can be increased, for example, by increasing the amount of the binder in the surface layer. The binder is preferably a melamine resin, but other resins and binders can also be used.
[006] This makes it possible to create and control the color variation and combine it with variations in the structure.
[007] Formulation control - By controlling the composition of the WFF powder mixture, such as the amount and / or type of polymeric resin, such as melamine resin, the fluidity of the composition can be controlled to provide more or less difference in pressure (and thus greater or lesser displacement) on different parts of the surface during thermal compression. Compositions that provide a low pressure difference with respect to the surface cause the substantially homogeneous powder mixture to remain substantially homogeneous providing a homogeneous coloring on the surface. Compositions that provide a higher pressure difference restrict the flowability of the bulk powder and the homogeneity of the mixture will then be broken, as the more fluid parts of the composition flow out partially. The result is a composition gradient over the surface area. In this way, a color variation can be achieved or avoided depending on the preference of the producer.
[008] Other ways to vary the fluidity of the composition is to change the amount and / or the type of fiber, the use of processing aids such as plasticizers, solvents, reactive solvents and the like.
[009] Heat control - The typical WFF formulation consists partly of wood fibers. Such wood fibers are prone to browning by heating. By applying more or less heat to the surface the coloring can be controlled.
[0010] Control by pressure - The control of the pressure applied in the compressed state by heat can also control the color difference. At a higher pressure the flowability of the bulk powder is restricted so that the homogeneity of the powder mixture will be broken as described above to provide a gradient in the composition with respect to the surface area.
[0011] Control by design of the press plate - By optimizing the surface area of the plate or paper structure, a greater and / or lesser flow can be controlled, thereby helping to control the color difference over the surface area.
[0012] Diffusion control, heterogeneous diffusion - WFF powder can be diffused in a heterogeneous (non-uniform) way to cause the pressure difference on the surface area when the product is hot compressed. This can be desired after a local reinforcement is made, such as in the parts of the plate where a fastening element can be positioned. In such a case, the mechanical, chemical and water resistance can be optimized in areas of the fastening system that may be subject to moisture, cleaning agents and mechanical wear.
[0013] Heterogeneous diffusion can also be done to follow the structure of the plate or stamping paper. In this case, the pressure difference can be combined to provide a product that has an equal amount of material over an area of the surface that provides equally good product properties and appearance on the surface.
[0014] Heterogeneous diffusion can be used to enrich the amount of material in the protruding parts of the structure, in order to obtain better chemical and mechanical properties in those parts of the surface that are subject to greater effort by movement and cleaning.
[0015] Heterogeneous diffusion can also be used to introduce differences in pressure on the area during thermal compression in excess of what is guaranteed from the structure of the press plate or paper. In this case, depending on the volume flow control of the powder mixture, the color variation can be controlled.
[0016] Using more than one powder mixture for heterogeneous diffusion, it can have a specific formulation tailored to the application. If a protruding part needs to be protected, this part can be richer in resins and wear particles compared to the total volume of the product, thereby saving the cost of the formulation. If the water resistance of a locking system area needs to be optimized, a more hydrophobic powder mixture can be used. If a specific decorative effect is desired, the fluidity of the powder can be optimized to provide a wide color variation. The choice of pigment or other project material can also be used in heterogeneous diffusion.
[0017] Control by mechanical design - the removal or mixing of the surface of part of the dust layer diffused through insufflation, absorption, brushing, scraping, cutting or equivalent are also means to introduce the pressure difference over the area during thermal compression. In this case, similar effects of color variation can be obtained due to pressure differences as described above for heterogeneous diffusion. In the event that two or more layers of powder are diffused on the surface, the effect of partial removal or mixing can be further improved, for example, by differences in the composition of the powder layers. A local mixing, a micro-mixing, of powders will cause a gradient in stains that is further improved by the pressure difference caused that provide another gradient in the hue of the differently colored surface. The result is a possibility of obtaining very complex color variations on the surface.
[0018] Partial removal or mixing on the surface as well as non-homogeneous diffusion can be easily achieved using robots to carry out the design actions in a controlled or uncontrolled manner in order to provide identical or individual designs.
[0019] The above control methods can be used to adjust the properties of the product. As an example, greater wear resistance on parts of the surface could be desired.
[0020] A first aspect of the invention is a construction panel comprising a decorative surface layer 5 connected to a heartwood 6. The surface layer is a mixture comprising fibers 14, colored substance 15 preferably colored pigments, a binder and wear-resistant particles 12. In addition, the surface layer comprises lower and upper parts and there is preferably a binder concentration gradient between the lower and upper parts. In a preferred embodiment, the lower parts comprise less binder than the upper parts. The binder is in a preferred embodiment of the resin.
[0021] A reversed condition can also be used. The fact that it has a higher binder content at the bottom provides a flow gradient for both the plate and the top that can make it possible to have a saturated surface area between the plate and the bottom.
[0022] The surface layer preferably has a substantially homogeneous distribution of wear-resistant particles over the entire thickness of the layer and wear-resistant particles are present from the bottom and thus with the heart to the top.
[0023] The surface layer can in one embodiment comprise a sublayer and a top layer. The sublayer may not include wear-resistant particles and colored pigments. In this case, the sublayer can be considered as a widespread core.
[0024] The preferred embodiments of the first aspect of the invention are disclosed under Detailed Description of Modalities and in the dependent product claims below.
[0025] A second aspect of the invention is a process of manufacturing a panel for construction that has a structured surface with a design that comprises variation and color in register with the structure in which the process comprises the steps of: • application of a layer comprising a mixture of fibers, binder, preferably a resin, wear-resistant particles and a colored substance, preferably colored pigments, on a support where the mixture is buoyant under heat and pressure • application of heat and pressure to the mixture by a structured matrix comprising projections and cavities such that a controlled fluctuation of the mixture is obtained by varying the pressure distribution applied on the surface. In a preferred embodiment the resin content in the layer is adapted to the pressure such that sufficient flotation is obtained and preferably the binder is a resin and the resin content by weight is at least 40% of the layer.
[0026] To increase fluidity, the mass ratio between the binder and the fibers is preferably in the range of approximately 130-240%, more preferably in the range of 150-220%, more preferably still in the range of approximately 180- 200%. In the most preferred embodiment the mass ratio between the binder and the fibers is approximately 190%.
[0027] The preferred embodiments of the second aspect of the invention are described under the Detailed Description of Modalities and in the dependent product claims below.
[0028] To increase the possibility of release, that is, the ability to be released and not adhere to the press plate, a mass ratio between resins and the sum of the masses of fibers and coloring substances is preferably more high than approximately 60%, more preferably higher than approximately 100% and most preferably still in the range of approximately 100 - 130%.
[0029] The layer in the process preferably has a substantially homogeneous distribution of wear-resistant particles over the entire thickness of the layer and wear-resistant particles are present from the fungus and thus in contact with the support, up to the top.
[0030] Another aspect of the invention is the use of the principles and control methods above to create a surface with a uniform color distribution and / or properties. In this case a layer with a fluidity, when the applied pressure is used, which is sufficiently low, to keep the mixture substantially homogeneous or the mixture substantially homogeneous and the distribution of the component in the layer. Such low fluidity can be obtained by the fact that it has certain proportions between resins, fibers and pigments. A proportion could be calculated by dividing the mass of resins and the mass of fibers, this proportion is preferably less than approximately 90% and even more preferably less than approximately 80%. Ou-traproportion could be between the mass of resins and the sum of the mass of fibers and the mass of coloring substances; this ratio is preferably higher than approximately 60% and in a preferred range of approximately 100-130%. Brief Description of Drawings
[0031] The following invention will be described in association with the preferred modalities and in more detail with reference to the examples of attached drawings, in which
[0032] Figure 1 illustrates a Wood Fiber Floor panel and
[0033] figure 2 illustrates a wood fiber floor panel with registered stamping according to a modality of the invention. Detailed Description of the Modalities
[0034] Figure 1 shows a Wood Fiber Floor (WFF) panel of the type described in WO 2009/065769, in which the surface layer 5 was formed on a core 6 which was produced in a previous separate operation, by example, an HDF panel. The surface layer comprises wood fibers 14, wear-resistant particles 12 and a binder. The surface layer may in one embodiment comprise a sublayer and a top layer. This layer could be produced in the same way as the top layer and compositions of the same material could be used except that in some embodiments, wear resistant particles and colored pigments are not included. In this case, the sublayer can be considered as a widespread core.
[0035] Figure 2 shows a modality of a Wood Fiber Floor (WFF) panel according to the invention with color variation 3 in register with the structure 2 of a surface layer 5.
[0036] Preferably the same diffusion and press units are used as disclosed in WO 2009/065769 preferably together with a press plate structured in the process according to the invention. The panels according to the invention are preferably produced by this process.
[0037] To illustrate the effects of the parameters used in the control methods above, some examples are provided below.
[0038] Examples 1-3 show the effect of changing position. Example 4 presents the comparison with the pressure variation effect of example 1. The surface layer in Examples 1-4 is diffused into one layer. In Examples 5-6 the surface layer comprises an sublayer and a top layer. The surface layer is in all instances spread over an HDF panel. Aluminum oxide is used as the wear-resistant particles in all examples and the coloring substance is a Titanium Dioxide pigment or combinations of Titanium Dioxide and Carbon Black. Example 1: High Structure, Normal Pressure
[0039] Widespread quantity: 600 g / m2
[0040] Support plate: 8 mm HDF
[0041] Reinforcement: 2 layers of NKR 140
[0042] Structure plate: Slate structure with 0.7 mm
[0043] Pressure: 45 kg / cm2,
[0044] Contact Time: 25 seconds
[0045] Press plate temperature: 160 ° C
[0046] Surface Layer One - Homogeneously diffused

[0047] The mass ratio between the Formaldehyde Melamine Resin and the dry components (Wood Fiber, Colorant) is equal to 61%.
[0048] The mass ratio between Formaldehyde Melamine Resin and Wood Fiber is equal to 77%.
[0049] The resulting product is a whitish homogeneous product. Example 2: High Structure, Normal Pressure
[0050] Widespread quantity: 600 g / m2
[0051] Support plate: 8 mm HDF
[0052] Reinforcement: 2 layers of NKR 140
[0053] Structure plate: Slate structure with 0.7 mm
[0054] Pressure: 45 kg / cm2,
[0055] Contact time: 25 seconds
[0056] Press plate temperature: 160 ° C
[0057] Surface Layer One - Homogeneously diffused

[0058] The mass ratio between the Formaldehyde Melamine Resin and the dry components (Wood Fiber, Colorant) is equal to 131%.
[0059] The mass ratio between Formaldehyde Melamine Resin and Wood Fiber is equal to 188%.
[0060] The resulting product is a substantially whitish homogeneous product with some whiter spots in the grooves of the stamped structure. Example 3: High Structure, Normal Pressure
[0061] Widespread quantity: 600 g / m2
[0062] Support plate: 8 mm HDF
[0063] Reinforcement: 2 layers of NKR 140
[0064] Structure plate: Slate structure with 0.7 mm
[0065] Pressure: 45 kg / cm2,
[0066] Contact time: 25 seconds
[0067] Press plate temperature: 160 ° C
[0068] Surface Layer One - Homogeneously diffused

[0069] The mass ratio between the Formaldehyde Melamine Resin and the dry components (Wood Fiber, Colorant) is equal to 271%.
[0070] The mass ratio between Formaldehyde Melamine Resin and Wood Fiber is equal to 382%.
[0071] The resulting product is a substantially whitish homogeneous product with many whiter spots in the grooves of the stamped structure. Example 4: High Structure, High Pressure
[0072] Widespread quantity: 600 g / m2
[0073] Support plate: 8 mm HDF
[0074] Reinforcement: 2 layers of NKR 140
[0075] Structure plate: Slate structure with 0.7 mm
[0076] Pressure: 60 kg / cm2,
[0077] Contact time: 25 seconds
[0078] Press plate temperature: 160 ° C
[0079] Surface Layer One - Diffused homogeneously.

[0080] The resulting product is a substantially whitish homogeneous product with many whiter spots in the grooves of the stamped structure.
[0081] The mass ratio between the Formaldehyde Melamine Resin and the dry components (Wood Fiber, Colorant) is equal to 131%.
[0082] The mass ratio between Formaldehyde Melamine Resin and Wood Fiber is equal to 188%. Example 5: Heterogeneous diffusion
[0083] Widespread quantity: 300 + 300 g / m2
[0084] Support plate: 8 mm HDF
[0085] Reinforcement: 2 layers of NKR 140
[0086] Structure plate: Slate structure with 0.7 mm
[0087] Pressure: 45 kg / cm2,
[0088] Contact time: 25 seconds
[0089] Press plate temperature: 160 ° C
[0090] Formulation of the sub-layer - spread evenly.

[0091] The mass ratio between the Formaldehyde Melamine Resin and the dry components (Wood Fiber, Colorant) is equal to 132%.
[0092] The mass ratio between Formaldehyde Melamine Resin and Wood Fiber is equal to 150%.
[0093] Formulation of the top layer - Diffused through a matrix ("shablon").

[0094] The mass ratio between the Formaldehyde Melamine Resin and the dry components (Wood Fiber, Colorant) is equal to 122%.
[0095] The mass ratio between Formaldehyde Melamine Resin and Wood Fiber is equal to 124%.
[0096] The resulting product is a dark gray product with a black pattern. In the deeper stamped regions, the black color is more intense compared to the shallower regions. Example 6: Mechanical design
[0097] Widespread quantity: 300 g / m2 of sublayer + 300 g / m2 of top layer
[0098] Support plate: 8 mm HDF
[0099] Reinforcement: 2 layers of NKR 140
[00100] Structure plate: Slate structure with 0.7 mm
[00101] Pressure: 60 kg / cm2,
[00102] Contact time: 25 seconds
[00103] Press plate temperature: 160 ° C
[00104] Sub-layer formulation - spread evenly.

[00105] The mass ratio between the Formaldehyde Melamine Resin and the dry components (Wood Fiber, Colorant) is equal to 136%.
[00106] The mass ratio between Formaldehyde Melamine Resin and Wood Fiber is equal to 194%.
[00107] Formulation of the top layer - Diffused homogeneously.

[00108] The mass ratio between the Formaldehyde Melamine Resin and the dry components (Wood Fiber, Colorant) is equal to 122%.
[00109] The mass ratio between Melamine Formaldehyde Resin and Wood Fiber is equal to 124%.
[00110] After the diffusion of the sublayer and the top layer, a robot scratched the surface in a programmed way to remove part of the top layer.
[00111] The resulting product is a black surface that has a grayish-white decoration according to the robot's action.

权利要求:
Claims (6)
[0001]
1. Construction panel comprising a decorative surface layer (5) arranged at a core (6) characterized by the fact that the surface layer comprises a lower part and an upper part arranged above the lower part with a concentration gradient of binder (19) between the bottom and the top, the bottom of the surface layer comprising a first mixture comprising fibers (14), coloring substance (15), a binder (19) and wear-resistant particles (12) , and the upper part of the surface layer comprises a second mixture comprising the fibers (14), the coloring substance (15), the binder (19), and the wear-resistant particles (12), wherein the first mixture has a first homogeneous concentration of binder (19) in which the second mixture has a second homogeneous concentration of binder (19) different from the first homogeneous concentration of binder (19).
[0002]
Construction panel according to claim 1, characterized by the fact that the lower parts comprise less binder (19) than the upper parts.
[0003]
Construction panel according to claim 1, characterized by the fact that the upper parts comprise less binder (19) than the lower parts.
[0004]
Construction panel according to any one of claims 1 to 3, characterized in that the binder (19) is a melamine resin.
[0005]
Construction panel according to any one of claims 1 to 4, characterized in that the fibers (14) are wood fibers.
[0006]
Construction panel according to any one of claims 1 to 5, characterized in that the panel is a floor panel.

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