阅读说明：本技术 饰面元件、用于生产饰面元件的方法 (Surface element and method for producing a surface element ) 是由 G·齐格勒 R·里廷格 于 2018-12-18 设计创作，主要内容包括：本发明涉及一种生产饰面元件的方法,该方法包括在基底上施加第一层,在饰面层上施加第二层,在第一层上施加饰面层,其中第二层施加到其上,使得第二层面对第一层,将第一层、第二层和饰面层压制在一起以形成饰面元件,由此来自第二层的材料透入饰面层中,并且其中,在压制之后,第一层通过饰面层的裂缝、空腔、孔和/或节疤可见。还提供一种饰面元件。(The present invention relates to a method of producing a veneer element, the method comprising applying a first layer on a substrate, applying a second layer on the veneer layer, applying the veneer layer on the first layer, wherein the second layer is applied thereto such that the second layer faces the first layer, pressing the first layer, the second layer and the veneer layer together to form the veneer element, whereby material from the second layer penetrates into the veneer layer, and wherein, after pressing, the first layer is visible through cracks, cavities, holes and/or knots of the veneer layer. A veneer element is also provided.)

1. A method of producing a veneer element, the method comprising:

a first layer is applied to the substrate,

a second layer is applied over the facing layer,

applying a facing layer, having a second layer applied thereto, on the first layer, such that the second layer faces the first layer,

pressing the first layer, the second layer and the facing layer together to form the facing element, whereby material from the second layer penetrates into the facing layer, and

wherein after pressing, the first layer is visible through at least one defect of the facing layer, such as a crack, cavity, hole, and/or knot.

2. Method according to claim 1, wherein during pressing defects such as cracks, holes and/or knots of the finishing layer are at least partially filled with material from the first layer.

3. The method of claim 1 or 2, wherein applying the second layer on the facing layer comprises applying a liquid on the facing layer and subsequently applying a dry powder on the facing layer to form the second layer.

4. The method of claim 1 or 2, wherein the second layer is applied as a slurry.

5. The method according to any of the preceding claims, wherein no defects of the second layer, such as cracks, holes and/or knots of the veneer layer, adhere to the veneer layer.

6. A method according to any preceding claim, wherein the second layer prevents the penetration of material from the first layer into the facing layer during pressing.

7. The method of any preceding claim, wherein the first layer comprises a pigment and/or a dye.

8. The method of any preceding claim, wherein the first layer has a substantially uniform color.

9. The method of any of the preceding claims, wherein the second layer is free of pigments and dyes.

10. The method of any of claims 1-7, wherein after pressing, the second layer has a different color than the first layer.

11. A method according to any preceding claim, wherein the second layer is transparent or optically transmissive after pressing.

12. The method of any preceding claim, wherein the first layer comprises a thermosetting adhesive.

13. The method of any of the preceding claims, wherein the second layer comprises a thermoset adhesive.

14. The method of any preceding claim, wherein the first layer is applied in dry powder form.

15. The method of any preceding claim, wherein the substrate comprises a wood-based board, a particle board, a thermoplastic board, a plywood, a veneer layer, a sheet, or a non-woven fabric.

16. A veneer element comprising

A substrate, a first electrode and a second electrode,

a first layer disposed on the substrate and having a first thickness,

a second layer disposed on the first layer, an

A veneer layer disposed on the second layer, wherein the first layer is visible through defects of the veneer layer such as holes, cavities, cracks, and/or knots, and wherein material from the second layer is present in the veneer layer.

17. The veneer element according to claim 16, wherein no material from the second layer is present in defects (such as holes, cavities, cracks or knots) of the veneer layer.

18. The veneer element according to claim 16 or 17, wherein defects such as cavities, cracks, holes and/or knots of the veneer layer are at least partially filled with material from at least the first layer.

19. The veneer element according to any one of claims 16-18, wherein the second layer is transparent or light transmitting.

20. The veneer element according to any one of claims 16-19, wherein the second layer is adapted to prevent the penetration of material from the first layer into the veneer layer.

21. The veneer element according to any one of claims 16-20, wherein the first layer comprises a pigment and/or a dye.

22. The veneer element according to any one of claims 16-21, wherein the first layer has a substantially uniform color.

23. The veneer element according to any one of claims 16-22, wherein the second layer is free of pigments and dyes.

24. The veneer element according to any one of claims 16-22, wherein the second layer has a different color than the first layer.

25. The veneer element according to any one of claims 16-24, wherein the substrate comprises a wood based board, a particle board, a thermoplastic board, a plywood, a veneer layer, a sheet or a non-woven fabric.

Technical Field

The invention relates to a method for producing a surface element, and to such a surface element.

Background

Floor coverings having a wooden surface can be of several different types. Solid wood flooring is made of solid wood blocks in the form of wood boards. The solid wood composite floor is formed by adhering a wood/wood surface layer on a core. The core may be a thin core board or a wood based panel/wood based panel, such as plywood, MDF (medium density fibreboard) or HDF (high density fibreboard). As an example, the wood surface layer may have a thickness of 2-10 mm.

Wood floor coverings may also be formed by gluing a wood/wood veneer onto a core, for example a wood based panel, such as a particle board, MDF or HDF. The wood veneer is a thin layer of wood, for example, 0.2 to 1 mm thick. Floorings having a separate surface layer bonded to a core of, for example, HDF or plywood, are more resistant to moisture than solid wood floorings.

Wood-faced floors can be produced at lower cost compared to solid wood floors and solid wood composite floors, since only a thin wood layer is used. However, wood veneer layers cannot be sanded as with solid wood or solid wood composite flooring.

As an alternative to wood flooring, laminate flooring is also feasible. Direct-pressed laminate floors usually comprise a core of 6-12 mm fibreboard, a 0.2 mm thick upper decorative surface layer of laminate material and a 0.1-0.2 mm thick lower balancing layer of laminate material, the lower balancing laminate layer being made of laminate material, plastic, paper or similar.

The laminate surface typically comprises two sheets of paper; a printed decor paper of 0.1 mm thickness and a transparent overlay of 0.05-0.1 mm thickness for protecting the decor paper from abrasion. The transparent cover layer made of alpha cellulose fibres contains small, hard transparent aluminium oxide particles, which gives the surface layer a high wear resistance.

The printed decor paper and the overlay are impregnated with melamine resin and laminated under heat and pressure to a wood fibre based core. The two paper layers had a total thickness of about 0.3 mm before pressing and were compressed to about 0.2 mm after pressing.

Wood-faced flooring may have lower impact resistance than laminate flooring and, when high quality finishes are used, may be costly to produce compared to laminate flooring.

Recently, new "paperless" type floors have been developed, the solid/solid surface of which comprises a substantially homogeneous powder mixture of fibers, binder and wear resistant particles. As disclosed in WO 2009/065769, the mixture is applied on a wood based panel (e.g. MDF or HDF), and subsequently heat and pressure are applied to the mixture to form a surface layer on the panel. Such a surface layer is sold under the trade mark NADURA.

WO 2009/065769 also discloses a thin surface layer, such as a wood veneer layer, applied on a sub-layer comprising, for example, softwood or solid wood fibres mixed with a binder. The sublayer is applied on a core based on wood fibres.

US 2,831,794 discloses a method of manufacturing a veneer panel. A green facing is applied to a mat of resin coated core particles comprised of fiber particles. An adhesive is applied to the facing to bond the facing to the fiber core and form a densified surface area in the fiber core. The purpose of this material of the core is to fill the scab holes or open defects in the veneer. When heat and pressure are applied, the result is a panel in which the resin coated core particles fill any imperfections or holes that would otherwise be present in the veneer.

US 2,419,614 discloses a coated wood product in which plywood is coated with a covering or cladding material consisting of a mixture of sawdust and synthetic resin. The facing layer is coated with a covering or cladding material such that the facing layer is no longer visible. The cover forms the uppermost layer of the product.

WO 2015/105455 discloses that holes and cracks of wood veneer can be filled with material from a sublayer comprising wood fibres and a binder during the pressing process. Thus, lower quality wood finishes can be used.

WO 2015/105456 discloses a method of controlling the penetration of sub-layers into the wood veneer during pressing. Thus, by controlling the extent to which material penetrates into the wood veneer from the sub-layers, the design of the pressed wood veneer can be controlled.

In the above description, different types of products have been described with reference to floors. However, the same materials and problems apply to other types of building panels, such as wall panels, ceiling panels and furniture components.

Disclosure of Invention

It is an object of at least embodiments of the present invention to provide improvements to the above-described and known techniques

It is another object of at least embodiments of the present invention to provide an improved design of the veneer layer.

It is another object of at least embodiments of the present invention to further control the design of the veneer layer after pressing.

It is another object of at least embodiments of the present invention to provide a veneer layer whose defects (e.g., holes, cracks, and knots) are filled with material from a layer disposed below the veneer layer without affecting other portions of the veneer layer.

At least some of these and other objects and advantages, which will become apparent from the description, have been achieved by a method of producing a veneer element according to the first aspect of the invention. The method includes applying a first layer on a substrate, applying a second layer on a facing layer, applying the facing layer with the second layer applied thereto on the first layer such that the second layer faces the first layer, pressing the first layer, the second layer, and the facing layer together to form a facing layer element, whereby material from the second layer penetrates into the facing layer, and wherein, after pressing, the first layer is visible through defects of the facing layer, such as cracks, cavities, holes, and/or knots.

Defects include any cracks, cavities, holes, and/or knots in the veneer layer. The defects may include any non-solid and/or non-dense portions of the veneer layer. The dense part of the wood veneer is the following part of the veneer layer: wherein defects visible through the eye, i.e. macroscopic defects such as cracks, cavities, pores and/or knots, are absent.

Cracks, cavities, holes, and/or knots may also be desired and formed during the production process to create the desired defects in the finish layer.

An advantage of embodiments of at least the first aspect is that the design of the facing layer element may be further controlled by applying the facing layer on two layers having different properties. The composition of the first layer may be different from the composition of the second layer. For example, the first layer may be colored or dyed and the second layer may be free of pigments and/or dyes. Alternatively, the first layer may have a different color than the second layer. Thus, the design of the pressed finish can be controlled.

During pressing, material from the second layer at least partially penetrates into and/or through (penetrates) the facing layer. In contrast to embodiments in which only a single layer is provided, the second layer, which at least partially penetrates into the facing layer, at least partially or completely prevents the first layer from penetrating into or through the facing layer. However, in any defects of the veneer layer, such as cracks, cavities, holes and/or knots, the first layer is visible through any cracks, cavities, holes and/or knots.

Penetration refers to the diffusion or penetration of the second layer into the microstructure of the veneer layer, which is not visible to the naked eye, such as wood pores.

Thus, defects such as cracks, cavities, holes and knots are visible and filled by material from the first layer. For example, the first layer may be darker in color than the facing layer. Thus, defects such as cracks, cavities, holes and knots are visible and are darkly colored.

Thus, when the first layer is seen through defects such as cracks, cavities and/or knots, these defects are considered to have the color of the first layer.

At the same time, dark particles from the first layer are at least partially prevented by the second layer from penetrating into the dense portions of the facing layer. Thus, undesired coloration of the dense portion of the finish layer is at least partially prevented, while the defect is considered dark. Thus, the facing layer has a more aesthetic appearance and is more appealing to consumers.

However, for some designs, it may not be desirable to change the design of the veneer layer itself by allowing the colored material to pass through portions of the veneer layer other than the defects, such as through solid portions of the veneer layer, i.e., dense portions of the veneer. By arranging the second layer on the first layer, the finishing layer is penetrated by the second layer, and the second layer may at least partially prevent the first layer from penetrating into the finishing layer. Thus, the facing layer is substantially unaffected by the first layer after pressing. For example, by using a second layer that is substantially free of dyes or pigments, the second layer does not substantially change, or at least does not significantly change, the design of the facing layer through the facing layer. Thus, defects such as knots, holes and cracks are visible and filled with a material having one color, and the rest of the veneer layer remains substantially unaffected.

As another example, the second layer may have a different color than the first layer, such that any defects, such as knots, holes, and cracks, have one color (primarily from the first layer), and the material that penetrates into the facing layer has another color (primarily from the second layer). Thus, the veneer layer may be dyed one color (primarily from the second layer), such as a light color or a color corresponding to the natural color of the veneer layer, and defects such as knots, holes and cracks may have a different color after pressing, such as a dark color (primarily from the first layer).

The veneer layer may be or include a wood veneer or a cork veneer.

During pressing, the cracks, cavities, holes and/or knots of the facing layer may be at least partially filled with material from the first layer. Preferably, the material filling the defects, such as cracks, cavities, holes and/or knots, after pressing is flush with the upper surface of the veneer layer.

During pressing, material from the second layer may penetrate into the facing layer. That is, into the material of the veneer, rather than filling the defect. The material from the second layer may penetrate into and/or through the facing layer. The second layer may prevent material from the first layer from penetrating into and/or through the facing layer during the pressing process. Thus, the facing layer may be substantially unaffected by the material from the first layer after pressing, except for any imperfections.

Applying the second layer on the facing layer may include applying a liquid on the facing layer followed by applying a dry powder on the facing layer to form the second layer.

The second layer may be applied as a slurry.

No or substantially no second layer may be attached to the veneer layer at the cracks, cavities, holes, and/or knots.

The first layer may include a pigment and/or a dye.

The first layer may have a substantially uniform color. The first layer may be substantially uniformly coloured over its horizontal extension. The first layer may be substantially uniformly coloured in its vertical extension.

The second layer may have a substantially uniform color. The second layer may be substantially uniformly coloured over its horizontal extension. The second layer may be substantially uniformly coloured in its vertical extension.

The second layer may be free of pigments and dyes.

After pressing, the second layer may be transparent, or at least light-transmitting.

After pressing, the second layer may have a different color than the first layer. The second layer may contaminate the facing layer after pressing.

The second layer may include a pigment and/or a dye.

The first layer may comprise a thermosetting adhesive. The thermosetting binder may be an amino resin, such as melamine formaldehyde, urea formaldehyde or a combination or copolymer thereof.

The second layer may comprise a thermosetting adhesive. The thermosetting binder may be an amino resin, such as melamine formaldehyde, urea formaldehyde or a combination or copolymer thereof.

In one embodiment, the first layer and/or the second layer may comprise a thermoplastic adhesive.

The first layer may be applied as a dry powder. For example, the binder of the first layer may be applied as a dry powder. Alternatively, the first layer may be applied in liquid form, for example by applying an adhesive in liquid form.

The second layer may be applied as a dry powder. For example, the binder of the second layer may be applied as a dry powder. Alternatively, the second layer may be applied in liquid form, for example by applying an adhesive in liquid form.

The second layer may be present at 5-200g/m²The amount of (c) is applied. By applying at least 5-200g/m²The second layer prevents the first layer from penetrating into the facing layer during pressing. If the second layer is applied in powder form, the second layer may be applied at a rate of at least 50g/m²Preferably at least 100g/m²The amount of (c) is applied. If the second layer is applied in liquid form, the second layer may be applied in an amount of 10 to 100g/m²Preferably 20 to 50g/m²The amount of (c) is applied.

The first layer and/or the second layer may further comprise a filler. The filler may be particles or fibres, for example wood fibres or wood particles, or mineral particles or mineral fibres. The wood particles may be lignocellulosic particles and/or cellulosic particles. The wood particles may be at least partially bleached/decolored.

The first layer and/or the second layer may comprise wear-resistant particles and/or scratch-resistant particles. Preferably, at least the second layer comprises wear-resistant particles and/or scratch-resistant particles.

The first layer may comprise a paper sheet, preferably a resin impregnated paper sheet. In embodiments where the first layer comprises a sheet of paper, the sheet of paper may be colored. In embodiments where the second layer comprises a paper sheet, the paper sheet may be a coated paper sheet of the type used for laminate flooring, for example. After pressing, the coated paper sheet was transparent. The first layer may comprise a thermoplastic sheet.

The substrate may comprise a wood based board, such as MDF, HDF, particle board, thermoplastic board, plywood, thin core board, veneer layer, such as wood or cork veneer, sheet/paper (e.g. paper sheet), non-woven fabric or conveyor belt. In one embodiment, the substrate may be included in the facing element after the substrate, the first layer, the second layer, and the facing layer are pressed together by pressing. In one embodiment, the facing element may be removed from the substrate after pressing.

According to a second aspect of the present invention, a veneer element is provided. The veneer element includes a substrate, a first layer disposed on the substrate, a second layer disposed on the first layer, and a veneer layer disposed on the second layer, wherein the first layer is visible through pores, cracks, and/or knots of the veneer layer, and wherein material from the second layer is present in the veneer layer.

Embodiments of the second aspect of the invention combine all the advantages of the first aspect of the invention, which have been discussed previously, and therefore the foregoing discussion also applies to the veneer element.

The veneer layer may be or include a wood veneer or a cork veneer.

There is no material from the second layer at the holes, cracks or knots in the facing layer.

The cracks, cavities, pores, and/or knots of the facing layer may be at least partially filled with material from at least the first layer. Preferably, the material filling the cracks, cavities, holes and/or knots is flush with the upper surface of the veneer layer.

The second layer may be adapted to prevent material from the first layer from penetrating into and/or through the facing layer. Thus, the facing layer is substantially unaffected by the first layer material after pressing, except for any imperfections.

The second layer may be transparent or light transmissive. In the context of the present invention, light transmissive means that the second layer allows light to pass through, but does not allow the detailed shapes to pass through; is translucent.

The first layer may include a pigment and/or a dye.

The first layer may have a substantially uniform color. The first layer may be substantially uniformly coloured over its horizontal extension. The first layer may be substantially uniformly coloured in its vertical extension.

The second layer may have a substantially uniform color. The second layer may be substantially uniformly coloured over its horizontal extension. The second layer may be substantially uniformly coloured in its vertical extension.

The second layer may be free of pigments and dyes.

After pressing, the second layer may have a different color than the first layer. The second layer may contaminate the facing layer after pressing.

The first layer may comprise a thermosetting adhesive. The thermosetting binder may be an amino resin such as melamine formaldehyde, urea formaldehyde or a combination or copolymer thereof.

The second layer may comprise a thermosetting adhesive. The thermosetting binder may be an amino resin such as melamine formaldehyde, urea formaldehyde or a combination or copolymer thereof.

In one embodiment, the first layer and/or the second layer may comprise a thermoplastic adhesive. The first layer may comprise a thermoplastic foil.

The first layer and/or the second layer may further comprise a filler. The filler may be particles or fibres, for example wood fibres or particles, or mineral particles or fibres. The wood particles may be lignocellulosic particles and/or cellulosic particles. The wood particles may be at least partially bleached.

The first layer and/or the second layer may comprise wear-resistant particles and/or scratch-resistant particles. Preferably, at least the second layer comprises wear-resistant particles and/or scratch-resistant particles.

The first layer may comprise a paper sheet, preferably a resin impregnated paper sheet. In embodiments where the first layer comprises a sheet of paper, the sheet of paper may be coloured. In embodiments where the second layer comprises a paper sheet, the paper sheet may be a coated paper sheet of the type used in laminate flooring, for example, which is transparent after pressing.

The substrate may comprise wood based board (e.g., MDF, HDF board, particle board), thermoplastic board, plywood, thin core board, veneer layer (e.g., wood veneer or cork veneer), sheet/paper (e.g., paper sheet), non-woven fabric, or conveyor belt (conveyor). In one embodiment, the substrate may be included in the facing element after the substrate, the first layer, the second layer, and the facing layer are pressed together by pressing. In one embodiment, the facing element may be removed from the substrate after pressing.

According to a third aspect of the invention, a method of producing a veneer element is provided. The method may include applying a first layer on a substrate, applying a liquid on a veneer layer including cracks, cavities, holes, and/or knots, subsequently applying a dry powder on the veneer layer, and pressing the substrate, the first layer, and the veneer layer together with the dry powder to form a veneer element.

Embodiments of the third aspect of the invention may combine all the advantages of the first aspect of the invention that have been discussed previously, whereby the previous discussion also applies to the veneer element.

Drawings

Embodiments of the present invention will be described in more detail by way of example with reference to the accompanying drawings, in which embodiments of the invention are shown.

Fig. 1A-1C illustrate a method of producing a veneer element according to one embodiment.

Fig. 2 shows a cross-section of an embodiment of a veneer element.

Fig. 3 shows an embodiment of a veneer element.

Detailed Description

Fig. 1A-1C illustrate a method of producing a veneer element 10. The veneer element 10 can be a furniture component, a building panel (e.g., floor panel, ceiling panel, wall panel, door panel), a console, a skirting board, a molded piece, an edge profile, etc. The method comprises providing a substrate 1. The substrate 1 is preferably a prefabricated substrate, made prior to the process of producing the veneer element 10. The substrate 1 may be a board, for example a wood based board as shown in the embodiments shown in fig. 1-3. The wood based board may be a wood fiber based board (e.g. MDF, HDF board, particle board, etc.) or a plywood board. In other embodiments, the substrate 1 may be a Wood Plastic Composite (WPC). The substrate 1 may be a mineral composite panel. The substrate 1 may be a fiber cement board. The substrate 1 may be a magnesia cement board. The substrate 1 may be a ceramic plate. The substrate 1 may be a plastic plate, for example a thermoplastic plate. In another embodiment, the substrate 1 may be a carrier (e.g., a paper sheet, a facing layer, or a nonwoven fabric), or a conveyor belt. The support may be a resin impregnated sheet, such as resin impregnated paper.

In fig. 1A, a first layer 2a is applied on a first surface of a substrate 1. In the embodiment shown in fig. 1A, the first layer 2a is applied in powder form 21. The powder 21 suitable for forming the first layer 2a is applied by spreading, as shown in fig. 1A, for example by a spreading device 20. The first layer 2a may also be applied as pellets. In other embodiments, the first layer 2a may be applied as a liquid, paste, sheet, or the like. The first layer 2a may be applied by roll coating, spray coating, or the like.

In the context of the present invention, a powder is ultimately a dispersed chemical substance in dry form, more precisely a dispersed solid comprising as constituents individual particles.

In the context of the present invention, granules/pellets are generally understood to be the aggregation of fine particles to form larger particles.

In one embodiment (not shown), the first layer 2a comprises a sheet impregnated with a thermosetting adhesive. The sheet material may be a paper sheet. The sheet may be colored and/or the binder solution used to impregnate the sheet may be colored such that the sheet is colored during the impregnation process.

The first layer 2a comprises a pigment and/or a dye. Preferably, the pigments and/or dyes may be darker than the natural color of the finish layer to be applied later in the process. The first layer 2a preferably has a uniform color. The first layer 2a is preferably uniformly colored in the horizontal direction. The first layer 2a is preferably uniformly colored in the vertical direction.

Moisture may be applied to the first layer 2 a. The first layer 2a may be dried, for example, by applying infrared or near infrared rays.

In fig. 1B, liquid or moisture is applied to the facing layer 3. The veneer layer 3 may be a wood veneer or a cork veneer. The facing has a porous structure and is therefore permeable. The facing layer 3 may have a thickness of about 0.2 to 1 mm. The facing layer 3 may be continuous or discontinuous. The facing layer 3 may be formed of several facing elements. The facing elements may or may not overlap. A gap may be formed between the facing members.

The finish layer 3 may include defects 6, such as holes, knots and/or cracks. By defects is meant naturally occurring defects in the veneer, such as holes, cavities, knots and/or cracks, as well as defects formed by, for example, grinding, punching, tearing, brushing, stretching, etc., prior to pressing, such as holes, cavities, knots and/or cracks.

The liquid may be water, a solvent, a binder, etc. The liquid may be applied by a spray device 24.

In a subsequent step, a second layer 2b is applied on the facing layer 3. In the embodiment shown in fig. 1B, the second layer 2B is applied in powder form 23. The powder 23 suitable for forming the second layer 2b is applied by scattering, as shown in fig. 1A, for example by scattering means 22. The second layer 2b may also be applied as pellets. In other embodiments, the second layer 2b may be applied as a liquid, paste, sheet, or the like. The second layer 2b may be applied by roll coating, spray coating, or the like.

The second layer 2b, applied in powder form, will adhere to the densified portions of the facing layer 3, since liquid or moisture has already been applied to the facing layer 3. However, no or substantially no powder will adhere to any cracks, cavities, holes and/or knots in the facing layer 3, as no material may adhere. Cracks, cavities, holes and/or knots are cavities in the facing layer 3 and therefore lack the ability to adhere the powder of the second layer 2 b. Thus, the second layer 2b is only present in the solid/dense part of the facing layer 3. The second layer 2b is absent or substantially absent from any cracks, cavities, holes and/or cavities in the facing layer 3.

The second layer 2b arranged on the finishing layer 3 can be stabilized, for example by applying infrared or near infrared light. Thereafter, the facing layer 3 having the second layer 2b adhered thereto may be processed, for example, stacked into a sheet or rolled into a continuous roll.

In one embodiment, the second layer 2b is free of pigments and dyes. The second layer 2b may be colourless.

In one embodiment, the second layer 2b comprises a pigment and/or a dye. The color of the second layer 2b may be different from the color of the first layer 2 a. The color of the second layer 2b may be suitable for dyeing the facing layer 3.

The first layer 2a and the second layer 2b comprise an adhesive. The adhesive may be a thermosetting adhesive, a thermoplastic adhesive, or a combination thereof. The binder may be a wood adhesive, a wood filler or any other type of putty-like paste. The thermosetting binder may be an amino resin, such as a melamine formaldehyde resin, a phenol formaldehyde resin, a urea formaldehyde resin, or a combination thereof. The urea-formaldehyde resin may be used alone or in combination with the melamine-formaldehyde resin to reduce the tension/stress created by the first layer 2a and/or the second layer 2b during curing, as compared to when only the melamine-formaldehyde resin is used. The thermoplastic adhesive may be polyvinyl chloride (PVC), Polyethylene (PE), polypropylene (PP), Polyurethane (PU), polyvinyl alcohol (PVOH), polyvinyl butyral (PVB), polyvinyl acetate (PVAc), and/or a thermoplastic elastomer (TPE), or combinations thereof.

The binder may be in powder form when applied.

In one embodiment, the first layer 2a comprises urea formaldehyde resin and the second layer comprises melamine formaldehyde resin. Melamine formaldehyde resins flow better than urea formaldehyde resins, which may lead to penetration, but have good transparency.

In one embodiment, the second layer 2b comprises urea formaldehyde resin and the first layer 2a comprises melamine formaldehyde resin. The urea-formaldehyde resin has a lower fluidity than melamine formaldehyde resin. To improve the permeability of the urea-formaldehyde resin, the binder can be applied in liquid form.

In one embodiment, both the first layer and the second layer comprise urea formaldehyde resin.

The first layer 2a and/or the second layer 2b may be formed from a mixture comprising a filler and a binder of the type described above. The mixture may further comprise a pigment as described above. The mixture may further comprise additives. The mixture may also comprise wear-and/or scratch-resistant particles. As an alternative to a mixture, the binder, filler, pigment, additive and any other components may be applied separately on the substrate 1.

The filler may be particles or fibres, for example wood fibres or wood particles, or mineral particles or mineral fibres. The wood particles may be lignocellulosic particles and/or cellulosic particles. The wood particles may be at least partially bleached. The filler may be rice, straw, corn, jute, flax, cotton, hemp, bamboo, bagasse or sisal particles or fibres. The first and/or second layer 2a, 2b may comprise starch, such as corn starch, potato starch, etc.

If the second layer 2b comprises wood fibres or wood particles, the fibres or particles are preferably at least partially bleached/bleached.

The filler may be a filler with sound-absorbing properties, such as cork particles and/or barium sulphate (BaSO)₄)。

The additives may be wetting agents, antistatic agents (e.g., carbon black), and thermally conductive additives (e.g., aluminum). Other possible additives are magnetic substances.

The first layer 2a and/or the second layer 2b may also comprise a foil or a sheet/paper.

Additives such as blowing agents may be included in the first and/or second layers 2a, 2 b. The blowing agent may be a physical blowing agent, such as an expanding agent (RTM), and/or a chemical blowing agent, such as AIBN (azoisobutyronitrile) or ADC (azodicarbonamide).

The first layer 2a may comprise a foaming agent for improving the filling of any cracks, cavities, pores and/or cavities.

The wear-and/or scratch-resistant particles may be aluminum oxide particles and/or silicon dioxide particles.

In one embodiment, the first layer 2a and/or the second layer 2b consists essentially of the binder and the optional additives, which means that at least 90% by weight of the first layer 2a and/or the second layer 2b is the binder and the optional additives. In one embodiment, the first layer 2a and/or the second layer 2b do not contain any fibers and/or fillers.

Additives may be, but are not limited to, wetting agents, antistatic agents such as carbon black, thermally conductive additives such as aluminum; a magnetic substance; blowing agents, for example physical blowing agents (for example expanding agents (RTM) or chemical blowing agents, for example AIBN (azoisobutyronitrile) or ADC (azodicarbonamide)), catalysts.

The first layer 2a may be 100-300g/m²Is preferably applied in an amount of 150-250g/m²E.g. about 200g/m². The amount of adhesive used for the first layer 2a may be 50 to 150g/m²Preferably 75 to 125g/m²E.g. about 100g/m². The first layer 2a may comprise 30-80% by weight, preferably 40-60% by weight, for example about 50% by weight of binder.

The second layer 2b may be 100-300g/m²Is preferably applied in an amount of 150-250g/m²If applied in powder form, e.g. about 200g/m². For the second layer 2b, the amount of binder applied in powder form may be 50-150g/m²Preferably 75 to 125g/m²E.g. about 100g/m². The second layer 2b may comprise 30-80% by weight, preferably 40-60% by weight, for example about 50% by weight of binder.

In liquid form, the second layer may be present at 5 to 100g/m²The amount of (c) is applied.

The first layer 2a may be pre-pressed before applying the wood veneer layer 3 with the second layer 2b applied. The facing layer 3 with the second layer 2b may be pre-pressed before pressing.

In fig. 1C, the finishing layer 3 to which the second layer 2b is adhered is disposed on the first layer 2a, on the substrate 1. The first layer 2a faces the second layer 2 b.

A balancing layer may also be applied on the lower surface of the substrate 1. The balancing layer may be a powder-based balancing layer applied as a powder. The powder-based balancing layer may comprise wood particles, such as lignocellulose particles and/or cellulose particles, and a binder, preferably a thermosetting binder, such as an amino resin. The balancing layer may be resin impregnated paper, preferably impregnated with a thermosetting adhesive. The balancing layer may comprise a veneer layer, such as a wood veneer or a cork veneer. The balancing layer may comprise a veneer layer, such as a wood veneer or a cork veneer, arranged on a sublayer comprising wood particles (e.g. lignocellulose particles and/or cellulose particles) and an adhesive, preferably a thermosetting adhesive, such as an amino resin.

As shown in fig. 1C, when the finishing layer 3 to which the second layer 2b is adhered is disposed on the first layer 2a disposed on the substrate 1, pressure is applied to the finishing layer 3 and/or the substrate 1. The pressure may be applied by a continuous press 30 or a discontinuous press (not shown). Preferably, heat is also applied.

After pressing, the veneer element 10 is formed, as shown in fig. 2 and 3. In one embodiment, the facing layer 3, the first and second layers 2a, 2b, and the substrate 1 are pressed together such that the facing element 10 comprises the substrate 1. In other embodiments, the face component 10 is removed from the substrate 1 after pressing.

After pressing, the second layer 2b may be transparent or at least light-transmitting. The second layer 2b may be coloured or dyed, but may at least remain light-transmissive. The second layer 2b may be transparent after pressing by having a high binder content. If the second layer 2b comprises wood fibres or particles, the wood fibres or particles are preferably cellulose fibres or particles. The wood fibres or particles are preferably at least partially bleached.

During pressing, the material from the second layer 2b can penetrate into the facing layer 3. The material from the second layer 2b may penetrate partially into the facing layer 3 or completely into the facing layer 3.

As shown in fig. 2 and 3, after pressing, the defects 6, such as holes, knots and cracks, are filled with material from the first layer 2 a. Preferably, the defects 6 (e.g. holes, knots and cracks) are filled with material from the first layer 2 a. Preferably, the material from the first layer 2a is flush with the upper surface 4 of the facing layer 3.

During pressing, the second layer 2b arranged on the first layer 2a prevents at least the first layer 2a from completely penetrating the solid/dense parts of the finishing layer 3. Thus, the facing layer 3 is substantially unaffected by the first layer 2 a. However, at defects 6, such as holes, knots and cracks, of the veneer layer 3, the first layer 2a fills the defects 6 (such as holes, knots and cracks). Thus, a visible design of the veneer layer 3 can be obtained, wherein defects 6 of the veneer layer, such as holes, knots and cracks, are darker in color than the rest of the veneer layer 3. The remainder of the facing layer is substantially unaffected by the first layer 2a so that the facing layer 3 is not colored by the first layer 2 a. By "substantially unaffected" is meant compared to how the appearance of the facing layer 3 would have been after pressing if the facing layer 3 were disposed only on the first layer 2 a.

In one embodiment, the second layer 2b does not contain any pigments and/or dyes. Thus, the facing layer 3 is not colored by any pigment or dye from the second layer 2b after pressing. The facing layer 3 will only be affected by the adhesive of the second layer 2b, for example. After pressing, the finishing layer 3 has its original appearance, or at least substantially, while any defects 6, such as knots, holes and cracks, will be visible and filled with material having the color of the first layer 2 a.

In one embodiment, the second layer 2b comprises a pigment and/or a dye. Preferably, the color of the second layer 2b is different from the color of the first layer 2 a. Thus, as the first layer 2a fills or at least partially fills the defects 6, the solid/dense parts of the finishing layer 3 after pressing can be colored by one color (mainly the color of the second layer) by penetration of the second layer 2b during pressing, while any defects 6, such as knots, holes and cracks, will be visible and colored in a different color (mainly the color of the first layer).

The penetration of the first and second layers 2a, 2b may be controlled based on several parameters such as the concentration of the binder in the first and second layers 2a, 2b, the water content in the first and second layers 2a, 2b, the applied pressure, the gas pressure and the filler concentration in the first and second layers 2a, 2b, and based on the thickness of the facing layer. By controlling these parameters, the degree to which the first layer 2a and/or the second layer 2b penetrate into the finishing layer can be controlled.

For example, in one embodiment, wherein the first layer 2a includes urea formaldehyde resin as the binder and the second layer 2b includes urea formaldehyde resin as the binder, the first layer 2a is prevented from penetrating into the facing layer 3 by the second layer 2 b. Thus, after pressing, the solid/dense part of the facing layer 3 is not affected by the penetration of material from the first layer 2 a.

In an embodiment in which the first layer 2a comprises urea formaldehyde resin as a binder and the second layer 2b comprises melamine formaldehyde as a binder, the first layer 2a is not completely prevented from transmitting through the facing layer 3 by the second layer 2 b. In this embodiment, some of the material from the first layer 2a may penetrate into the facing layer 3, since the melamine formaldehyde resin of the second layer 2b flows more during pressing than the urea formaldehyde resin.

In the embodiment shown in fig. 2 and 3, the balancing layer 5 is arranged on the lower surface 9 of the substrate 1. The balancing layer 5 may be a powder-based balancing layer applied as a powder. The powder-based balancing layer may comprise wood particles, such as lignocellulose particles and/or cellulose particles, and a binder, preferably a thermosetting binder, such as an amino resin. The balancing layer 5 may be a resin impregnated paper, preferably impregnated with a thermosetting adhesive. The balancing layer 5 may comprise a veneer layer, such as a wood veneer or a cork veneer. The balancing layer 5 may comprise a veneer layer, for example a wood veneer or a cork veneer, arranged on a sublayer comprising wood particles (for example lignocellulose particles and/or cellulose particles) and an adhesive, preferably a thermosetting adhesive, for example an amino resin.

In the embodiment shown in fig. 2 and 3, the substrate 1 is a board, such as a wood-based board, a particle board, a thermoplastic board, a plywood, a veneer, or the like. In other embodiments, the substrate may be a sheet (e.g., a paper sheet), a nonwoven, or a veneer layer (e.g., a wood veneer layer or a cork veneer layer).

In addition, a protective layer (not shown) may be applied to the finishing layer 3. The protective layer may be a coating, e.g. one or several lacquer layers. The coating may be an acrylate or methacrylate coating, such as a polyurethane coating. The coating may comprise wear-and/or scratch-resistant particles. The protective layer may be a covering paper comprising wear resistant particles. As described in WO 2011/129755, the protective layer may be a powder coating comprising processed wood fibres, a binder and wear resistant particles applied as a mixture on the facing surface. If the protective layer comprises or is a cover paper or powder cover layer, the protective layer is preferably applied prior to the step of applying heat and pressure. Thus, the protective layer is cured and adhered to the facing layer in the same step as the facing layer 3 is adhered to the first and second layers 2a, 2b and the substrate 1.

The veneer element 10 can be further treated in different ways, such as brushing, oiling, painting, waxing, etc.

A protective coating (not shown) may also be applied to the facing layer 3 prior to pressing. In one embodiment, the wax powder is applied, for example, dispersedly, on the upper surface of the finishing layer facing away from the substrate 1, prior to pressing. During the pressing process, the wax powder forms a protective coating of the veneer element 10.

A protective foil (not shown) may also be applied on the facing layer 3 before or after pressing. The protective foil may be a thermoplastic foil, such as a polyurethane or polyvinyl chloride foil.

In the figures, the first layer 2a and the second layer 2b are shown as two separate layers. However, after pressing, the first layer 2a and the second layer 2b may flow into each other such that no boundary exists between the layers.

It is envisaged that there are many modifications to the embodiments described herein which are still within the scope of the present invention as defined by the appended claims. When the term "about" is used in this specification with respect to a numerical value, the associated numerical value should include a deviation of +/-10% about the stated numerical value.

Examples of the invention

500g/m²Is spread on the HDF board to form a first layer, the powder composition comprising a dry mixture consisting of wood flour, melamine formaldehyde resin and brown pigment. Using 25g/m²The water sprays of (a) were 0.6 mm oak veneer including large holes and cracks. The mixing ratio is 100g/m²The powder composition of (a), which comprises a dry mixture of wood flour, melamine formaldehyde resin and black pigment, is spread on the wet veneer to form a second layer.

The facing was placed on top of the HDF board with the first and second powder layers facing each other.

The HDF board and the facings were hot pressed at 160 ℃ for 30 seconds using a pressing force of 40 bar, resulting in a facing element in which the black powder composition forming the second layer was visible in the tiny cracks and pores of the facings and the brown powder composition forming the first layer was visible in the large holes and cracks of the facings.