Multi-layer wood composite block, multi-layer wood veneer and manufacturing method thereof

文档序号：53863 发布日期：2021-09-28 浏览：34次中文

阅读说明：本技术 多层木材复合块，多层木材单板及其制造方法 (Multi-layer wood composite block, multi-layer wood veneer and manufacturing method thereof ) 是由 G·龙巴克于 2020-08-14 设计创作，主要内容包括：本发明涉及一种多层木材复合块、多层木材单板及其制造方法。此外,本发明涉及多层木材单板作为装饰和/或修饰元件的用途,特别是在车辆内部中,以及包含多层木材单板的制品。(The invention relates to a multilayer wood composite block, a multilayer wood veneer and a manufacturing method thereof. Furthermore, the present invention relates to the use of a multi-layer wood veneer as a decorative and/or furnishing element, in particular in a vehicle interior, as well as to an article comprising a multi-layer wood veneer.)

1. A multi-layer wood composite block comprising:

-a plurality of superimposed layers of wood, and

-at least one adhesive layer,

wherein the at least one adhesive layer is provided between successive wood layers, and

wherein the at least one adhesive layer in the cured state has a hardness of at least 70Shore A determined according to DIN EN ISO 868 and/or a hardness of at least 20Shore D determined according to DIN EN ISO 868.

2. The multi-layer wood composite block according to claim 1,

wherein the wood composite block comprises a plurality of adhesive layers.

3. The multi-layered wood composite block according to claim 1 or 2,

wherein the wood composite block is provided with

(a) A total carbon emission (TVOC) of less than or equal to 50 μ g carbon/gram as determined from VDA 277, and/or

(b) A volatile hydrocarbon (VOC) content of less than or equal to 100mg/kg and a semi-volatile organic compound (FOG) content of less than or equal to 250mg/kg, determined according to VDA 278; and/or

4. The multi-layer wood composite block according to any one of the preceding claims,

wherein at least one adhesive layer is colorable; and/or

Wherein the at least one adhesive layer can withstand temperatures up to 180 ℃; and/or

Wherein the wood composite block comprises at least one intermediate layer, and wherein the at least one intermediate layer is disposed between two wood layers.

5. The multi-layer wood composite block according to claim 4,

wherein at least one intermediate layer is comprised of metal, textile, plastic, leather, wool, stone, felt, pressed paper, mineral material, medium density (wood) fiberboard (MDF), or a combination thereof.

6. A multi-ply wood veneer, comprising:

-a plurality of superimposed layers of wood, and

-at least one adhesive layer,

wherein at least one adhesive layer is arranged between successive wood layers, an

Wherein the at least one adhesive layer in the cured state has a hardness of at least 70Shore A determined according to DIN EN ISO 868 and/or a hardness of at least 20Shore D determined according to DIN EN ISO 868.

7. The multi-ply wood veneer according to claim 6,

the thickness of the multilayer wood veneer is between 0.2mm and 4.0mm, preferably between 0.3mm and 1.5mm, more preferably between 0.5mm and 1.0mm, and even more preferably between 0.6mm and 0.9 mm; and/or

Wherein the wood veneer comprises a plurality of adhesive layers.

8. The multi-ply wood veneer according to any one of claims 6 or 7,

the wood veneer has:

(a) a total carbon emission (TVOC) of less than or equal to 50 μ g carbon/gram as determined from VDA 277, and/or

9. The multi-ply wood veneer according to any one of claims 6 to 8,

wherein the at least one adhesive layer is colorable; and/or

Wherein the at least one adhesive layer can withstand temperatures up to 180 ℃; and/or

Wherein said wood veneer comprises at least one intermediate layer, and

wherein the at least one intermediate layer is arranged between two wood layers.

10. The multi-ply wood veneer according to claim 9,

11. A method of manufacturing a multi-layer wood composite block according to any one of claims 1 to 5, comprising the steps of:

a) providing a plurality of dry wood layers;

b) dry gluing the dry wood layers together.

12. A method of manufacturing a multi-layer wood composite block according to claim 11 wherein the individual layers of wood are laminated on top of and/or adjacent to one another using a mould designed to prevent slippage of the layers of wood.

13. A method of manufacturing a multi-layer wood veneer, comprising cutting the multi-layer wood composite block according to any one of claims 1 to 5 into multi-layer wood veneers.

14. The method of making a multi-layer wood veneer according to claim 13,

wherein, the wood composite block is sawed or sliced, preferably sawed, into a plurality of layers of wood veneers; and/or

Wherein the processing, in particular the cutting of the multi-layer wood composite block, is performed in the dry state.

15. A multi-layer wood veneer obtained by the method for manufacturing a multi-layer wood veneer according to any one of claims 13 or 14.

16. Use of the multilayer wood veneer according to any one of claims 6 to 10 or 15 as a decorative and/or ornamental element, preferably in the interior of a vehicle.

17. An article comprising the multi-layer wood veneer according to any one of claims 6 to 10 or 15.

Technical Field

The invention relates to a multilayer wood composite block, a multilayer wood veneer and a manufacturing method thereof. Furthermore, the present invention relates to the use of a multi-layer wood veneer as a decorative and/or furnishing element, in particular in a vehicle interior, as well as to an article comprising a multi-layer wood veneer.

Background

Multi-layer wood veneers obtained from multi-layer wood composite blocks are known.

DE 602005001689T 2 relates to a method for producing veneers. According to this method, the wood block is cut into veneers having a thickness of about 0.65mm after being heated and soaked for a long time. Suitable adhesives mentioned include moisture-curing, hot polyurethane adhesives.

The method described in DE 1086425B for manufacturing a finished wood veneer optionally comprises slicing or circular stripping of multiple layers, glued wood blocks into individual veneers.

In EP 2310196B 1, a multi-layer wood block, a veneer obtainable therefrom and a method for the production thereof are described.

DE 102017113764B 4 discloses a method for producing wood veneers and veneer pieces, and a method for producing moulded parts. The veneer pieces are made with an adhesive and then cut into veneers.

DE 102015009012B 3 discloses a method for producing veneers, which method comprises cutting the veneers using a veneer slicer.

For economic reasons, the wood veneer is preferably manufactured using a slicing process. The method saves material, and the thickness of the manufactured veneer is between 0.3mm and 4 mm. However, the wood or veneer pieces must be heated and soaked with water for a long time in preparation for slicing. The achievable precision of the sliced veneers is limited, since this pre-treatment is accompanied by temperature and humidity changes, which result in deformations, in particular expansions, of the layers of wood in the veneer pieces. Furthermore, this type of pretreatment allows only a limited range of adhesion of different materials, or adhesion often does not result in the desired properties. In particular, adhesives that are both suitable for bonding different materials (e.g., wood, metal, plastic) and have sufficient moisture and/or heat resistance during soaking or cooking have not been commercialized. Furthermore, the pretreatment is clearly visible by the change in color of the wood. Last but not least, sliced veneers as well as round stripped veneers tend to have cracks in the veneer. In principle, veneers can only be obtained by slicing processes, reaching a certain hardness of the wood or wood (composite) block used; in particular, ironwood, i.e., various tropical woods, cannot be cut into veneers, and can only be processed by sawing.

Multi-layer sawn veneers are also known in the prior art. Sawing of wood (composite) blocks into veneers represents the most primitive method. One disadvantage of sawing is that the material loss is relatively large, depending on the thickness of the saw blade used. In general, sawing is rather time consuming. However, sawn veneers retain their color and are substantially free of cracks, as they do not have to be soaked/steamed and then dried again, but can be sawn directly in the dry state. Sawn veneers are typically manufactured to a thickness of 1mm or more, primarily for high quality and high stress work pieces such as furniture structures or floor coverings.

Disclosure of Invention

It is an object of the present invention to provide a multi-layered wood composite block suitable as a starting material for manufacturing high-precision veneers having a veneer thickness in the range of 0.2mm to 4.0 mm. It is another object of the present invention to provide a high precision multi-layer wood veneer that can be used for decorative and/or ornamental elements.

The wood composite block according to claim 1, the multilayer wood veneer according to claims 7 and 19, the method according to claims 14 and 16 and the use according to claim 20 and the article according to claim 21 solve the task of the present invention.

A first aspect of the invention relates to a multi-layer wood composite block comprising

-a plurality of superimposed layers of wood, and

-at least one adhesive layer,

wherein the at least one adhesive layer is provided between successive wood layers, and

wherein the at least one adhesive layer has a hardness of at least 70Shore A determined according to DIN EN ISO 868 and/or a hardness of at least 20Shore D determined according to DIN EN ISO 868 in the cured state.

Advantageous embodiments and further developments are indicated in the respective dependent claims.

The multilayer wood composite block according to the invention can be processed by sawing or slicing, because the wood composite block has advantageous properties. Preferably, the multilayer wood composite block according to the invention can be processed by sawing or slicing in the dry state, even more preferably by sawing in the dry state. If the cured adhesive layer of the wood composite block is too soft, sawing is no longer possible because the adhesive layer is smeared and/or the sawn veneer does not retain its shape. However, if the adhesive layer is too hard, sawing is not possible and/or the wear of the tools used is very severe. In particular, the adhesive layer has a hardness of at least 70Shore a and/or at least 20Shore D, preferably at least 75Shore a and/or at least 24Shore D, more preferably at least 80Shore a and/or at least 27Shore D in the cured state.

Preferably, the hardness of the adhesive layer is less than or equal to 60Shore D in the cured state.

Preferably, the hardness of the adhesive layer is less than or equal to 100Shore a in the cured state.

The hardness Shore A and Shore D were measured according to DIN EN ISO 868.

In contrast to the manufacture of veneers by slicing, sawing does not require a pretreatment of the wood composite block, i.e. temperature and/or humidity fluctuations are avoided so that the block does not deform and/or discolor. Thus, the sawn veneer can be manufactured with higher accuracy. Furthermore, the type of wood composite structure and the manufacture of veneers by sawing allow designs that cannot be achieved with previously known methods.

In principle, all adhesives suitable for gluing wood are suitable for the implementation of the invention. Anhydrous and solvent-free adhesives are preferred because moisture fluctuations or wood swelling and/or warping should be avoided.

Preferably, the at least one adhesive layer is prepared with a non-aqueous and a non-solvent adhesive. Any residual amounts of water and/or solvent contained are non-removable residual amounts, or, for example, the amount of water introduced by air humidity.

The adhesive properties of the adhesive also play a role. The surface properties, such as polarity and structure, of different materials (i.e., different woods and plastics, among others), as well as the surface properties of other materials that may be incorporated as interlayers in a multi-layer wood composite block or multi-layer wood veneer, may vary significantly. Thus, the decisive criterion for selecting a suitable adhesive is that the adhesive has sufficient adhesion to all materials used.

Suitable adhesives include Polyurethane (PUR), epoxy resins, silane-modified polymers or two-component adhesives, for example PVAc copolymers with isocyanates. Hot melt adhesives based on polyurethane prepolymers and epoxy resins are particularly suitable.

Particularly preferred are moisture-curing hot-melt adhesives based on polyurethane prepolymers having a processing temperature of from 100 ℃ to 140 ℃ and/or a viscosity of from 5000mPas to 20000mPas, preferably from 5000mPas to 16000mPas, more preferably from 8000mPas to 16000mPas (Brookfield DV-II + Thermosel, Spindle (Spindle)29) before curing at 130 ℃ and/or a density of 1.0g/cm before curing³To 1.5g/cm³Preferably 1.0g/cm³To 1.3g/cm³More preferably 1.1g/cm³To 1.3g/cm³。

According to a preferred embodiment, the wood composite block comprises a plurality of adhesive layers. On the one hand, the presence of multiple adhesive layers opens up additional design options, since each adhesive layer also always forms a thread element in the wood composite block. On the other hand, as the number of adhesive layers increases, the influence of the properties of the adhesive (e.g., hardness) on the workability of the wood composite block increases.

When the wood composite block comprises a plurality of different layers, the layers may be arranged in different ways; the specific arrangement of the various layers included in the wood composite block can be taken from the drawings.

In principle, the adhesive layer serves as an adhesive between one layer of wood and another layer of wood.

According to a further preferred embodiment, the wood composite block has

a) The total amount of carbon emissions (TVOC-total volatile organic compounds) determined according to VDA 277 that is less than or equal to 50 pg carbon/g,

and/or

b) A content of volatile hydrocarbons (VOC-volatile organic compounds) less than or equal to 100mg/kg and a content of semi-volatile hydrocarbons (FOG-atomized or SVOC-semi-volatile organic compounds) less than or equal to 250mg/kg, determined according to VDA 278,

and/or

c) A formaldehyde emission value determined according to VDA 275 lower than or equal to 3 mg/kg.

The above-mentioned TVOC, VOC, FOG emission values and formaldehyde emission values of the wood composite block according to the present invention may also be equal to zero independently of each other.

The expert distinguishes Volatile hydrocarbons VOC (Volatile Organic Compounds) from highly Volatile Organic compounds VVOC (very Volatile Organic Compounds) and low Volatile Organic compounds SVOC (less Volatile Organic Compounds). The sum of the concentrations of all Volatile hydrocarbons is the TVOC (Total Volatile Organic Compounds) value.

The term VOC embraces volatile organic compounds having a boiling point in the range of 50-100 c to 250-260 c. FOG and/or SVOC refer to organic compounds that have a boiling point range of 240 ℃ to 400 ℃ and may form precipitates (lubricant films).

Wood composite blocks meeting the VDA 275, VDA 277 and/or VDA 278 emission test standards described above have low toxicity. Thus, the wood composite block is suitable for various uses, especially indoors. For example, wood composite blocks are suitable for use in the manufacture of decorative and/or trim elements for vehicle interiors.

Preferably, the wood composite block has

a) A total carbon emissions (TVOC) of less than or equal to 50 pg carbon/gram as determined from VDA 277,

and

b) a volatile hydrocarbon (VOC) content of less than or equal to 100mg/kg and a semi-volatile organic compound (FOG) content of less than or equal to 250mg/kg, determined according to VDA 278;

a) A total carbon emissions (TVOC) of less than or equal to 50 pg carbon/gram as determined from VDA 277,

and

c) a formaldehyde emission value determined according to VDA 275 of less than or equal to 3 mg/kg;

b) A volatile hydrocarbon (VOC) content of less than or equal to 100mg/kg and a semi-volatile organic compound (FOG) content of less than or equal to 250mg/kg, determined according to VDA 278,

and

c) a formaldehyde emission value determined according to VDA 275 of less than or equal to 3 mg/kg;

more preferably, the wood composite block according to the present invention has

a) A total carbon emissions (TVOC) of less than or equal to 50 pg carbon/gram as determined from VDA 277,

and

b) a volatile hydrocarbon (VOC) content of less than or equal to 100mg/kg and a semi-volatile organic compound (FOG) content of less than or equal to 250mg/kg, determined according to VDA 278,

and

c) a formaldehyde emission value determined according to VDA 275 lower than or equal to 3 mg/kg.

According to a further preferred embodiment, at least one adhesive layer may be coloured and/or heat resistant up to 180 ℃, preferably 190 ℃, more preferably 200 ℃, even more preferably 220 ℃.

The colorable adhesive layer allows for inhibiting yellowing that may occur and/or preventing some or all of the light from passing through. For example, if the adhesive layer is colored with a black pigment, the yellowing effect that may be present will no longer be visible. Furthermore, the colorable adhesive layer opens up additional design options, since the adhesive layer also always forms line elements in the wood composite block.

The heat resistance of the adhesive layer prevents the yellowing effect, since even with strong natural fluctuations in the ambient temperature no or only very small amounts of decomposition products are present in the adhesive layer. Here, however, the heat resistance includes not only the decomposition of the adhesive layer but also the dimensional stability thereof; this means that an adhesive layer resistant to heat up to 180 ℃ neither softens (does not melt) nor does thermal decomposition of the adhesive layer occur. Adhesive layers resistant to heat up to 180 ℃ open up more options in terms of processing methods.

Preferably, the at least one adhesive layer is colorable and resistant to heat up to 180 ℃, preferably 190 ℃, more preferably 200 ℃, even more preferably 220 ℃ to prevent potential damage to the appearance due to yellowing.

According to another preferred embodiment, the wood composite block comprises at least one intermediate layer, wherein the at least one intermediate layer is arranged between two wood layers.

The use of intermediate layers opens up additional design options as each intermediate layer also always forms a thread element in the wood composite block. Furthermore, the intermediate layer may have an effect on the processing characteristics of the wood composite block.

Preferably, the at least one intermediate layer is comprised of metal, textile, plastic, leather, wool, stone, felt, pressed paper, solid surface material, medium density (wood) fiberboard (MDF), or a combination thereof.

One particularly suitable pressed paper is paper manufactured by Richlite (usa).

In the wood composite block according to the invention, the at least one intermediate layer may be arranged between the two wood layers such that the intermediate layer is bonded to the first wood layer by a first bonding layer and to the second wood layer by a second bonding layer, i.e. the intermediate layer is embedded in the bonding layer bonding the two wood layers.

According to a preferred embodiment, the wood composite block according to the invention comprises a plurality of intermediate layers. If the wood composite block comprises a plurality of intermediate layers, these intermediate layers may be arranged in different ways. For example, several intermediate layers may be arranged between the first and second wood layers. Possible arrangement variants of the individual layers contained in the wood composite block are shown in the figures.

The thickness of the layer may be the same over the entire area of the layer. However, the thickness of the layers may also be different. For example, the layers may have a rectangular, wedge, circular or curved cross-section. In principle, the shape and thickness of the layers can be freely selected, for example depending on the desired design.

The same applies to the wood layers and adhesive layers, and optionally also the intermediate layer, comprised in the wood composite block.

The moisture content of the wood composite block is less than or equal to 20%, preferably less than or equal to 18%, more preferably less than or equal to 15%, and even more preferably between 6% and 15%.

Wood moisture was measured by means of a commercial measuring device (Gann moisture tester (Hydromette), H35-M20), which determines wood moisture on the basis of electrical resistance (DIN EN 13183-2:2002-07 and DIN EN 13183-2Berichtigung 1: 2003-12).

Alternatively, the wood moisture can also be determined by kiln drying (DIN EN 13183-1:2002-07 and DIN EN13183-1Berichtigung 1: 2003-12).

Another aspect of the present invention relates to a multi-ply wood veneer, comprising:

-a plurality of superimposed layers of wood, and

-at least one adhesive layer,

wherein the at least one adhesive layer is provided between successive wood layers, and

wherein the at least one adhesive layer in the cured state has a hardness of at least 70Shore A (determined according to DIN EN ISO 868) and/or a hardness of at least 20Shore D (determined according to DIN EN ISO 868).

Preferably, the adhesive layer in the cured state has a hardness of at least 75Shore a and/or at least 24Shore D, more preferably at least 80Shore a and/or at least 27Shore D.

Preferably, the hardness of the adhesive layer is less than or equal to 60Shore D in the cured state.

Preferably, the hardness of the adhesive layer is less than or equal to 100Shore a in the cured state.

The hardness, Shore A and/or Shore D, is measured according to DIN EN ISO 868.

The technical effects related to the hardness of the adhesive layer, as described for the wood composite block according to the invention, are also valid for multi-layer wood veneers.

According to a preferred embodiment, the thickness of the multi-layer wood veneer according to the invention is between 0.2mm and 4.0mm, preferably between 0.3mm and 1.5mm, more preferably between 0.5mm and 1.0mm, even more preferably between 0.6mm and 0.9 mm.

The veneer thickness is in the range of less than or equal to 1.5mm, the multi-layer wood veneer is still flexible enough to be bent into shape, for example for decorative and/or trim element applications, especially automotive interiors. At the same time, the material consumption of a veneer having a thickness of less than or equal to 1.5mm is relatively low.

The wood veneer according to the invention is preferably manufactured with high precision, i.e. with a thickness tolerance of less than or equal to 0.25mm, preferably less than or equal to 0.20mm, more preferably less than or equal to 0.15 mm.

According to a preferred embodiment, the wood veneer has a plurality of adhesive layers.

According to a preferred embodiment, the wood veneer has

a) A total carbon emission (TVOC-total volatile organic compounds) determined according to VDA 277 of less than or equal to 50 μ g carbon/g,

and/or

c) A formaldehyde emission value determined according to VDA 275 lower than or equal to 3 mg/kg.

Preferably, the wood veneer has

a) A total carbon emissions (TVOC) of less than or equal to 50 pg carbon/gram as determined from VDA 277,

and

b) a volatile hydrocarbon (VOC) content of less than or equal to 100mg/kg and a semi-volatile organic compound (FOG) content of less than or equal to 250mg/kg, determined according to VDA 278;

a) A total carbon emissions (TVOC) of less than or equal to 50 pg carbon/gram as determined from VDA 277,

and

c) a formaldehyde emission value determined according to VDA 275 of less than or equal to 3 mg/kg;

b) A volatile hydrocarbon (VOC) content of less than or equal to 100mg/kg and a semi-volatile organic compound (FOG) content of less than or equal to 250mg/kg, determined according to VDA 278;

and

c) a formaldehyde emission value determined according to VDA 275 lower than or equal to 3 mg/kg.

More preferably, the wood composite block according to the present invention has

a) A total carbon emissions (TVOC) of less than or equal to 50 pg carbon/gram as determined from VDA 277,

and

b) a volatile hydrocarbon (VOC) content of less than or equal to 100mg/kg and a semi-volatile organic compound (FOG) content of less than or equal to 250mg/kg, determined according to VDA 278,

and

c) a formaldehyde emission value determined according to VDA 275 lower than or equal to 3 mg/kg.

According to another preferred embodiment, the at least one adhesive layer may be pigmented and/or heat resistant up to 180 ℃, preferably 190 ℃, more preferably 200 °, even more preferably 220 ℃, to prevent potential damage to the appearance due to yellowing.

According to another preferred embodiment, the wood veneer comprises at least one intermediate layer, wherein the at least one intermediate layer is arranged between two wood layers.

Preferably, at least one intermediate layer is composed of metal, textile, plastic, leather, wool, stone, felt, pressed paper, solid surface material, medium density (wood) fiberboard (MDF), or a combination thereof.

Suitable pressed papers are, for example, the products of richlite (usa).

According to another preferred embodiment, the wood veneer according to the invention comprises a plurality of intermediate layers.

In the wood veneer according to the invention, the at least one intermediate layer may be arranged between two wood layers, the intermediate layer being bonded to the first wood layer by a first bonding layer and to the second wood layer by a second bonding layer, i.e. the intermediate layer is embedded in the bonding layer bonding the two wood layers.

In case the wood veneer comprises a plurality of intermediate layers, these intermediate layers may be arranged in different ways. For example, several intermediate layers may be arranged between the first and second wood layers. Possible arrangement variants of the layers contained in the wood veneer are shown in the figures.

This applies both to the wood and to the adhesive layer, and optionally also the intermediate layer, comprised in the wood composite block.

Preferably, the multi-layer wood veneer of the present invention is a sawn veneer.

The wood moisture content of the wood veneer is less than or equal to 20%, preferably less than or equal to 18%, more preferably less than or equal to 15%, even more preferably between 6% and 15%.

Alternatively, the wood moisture can also be determined by kiln drying (DIN EN 13183-1:2002-07 and DIN EN13183-1Berichtigung 1: 2003-12).

The technical effects associated with the above described preferred embodiments, as described for the wood composite block according to the invention, are also valid for multi-layer wood veneers.

Another aspect of the invention relates to a method of manufacturing a multilayer wood composite block according to the invention as claimed in claims 1 to 6, comprising the steps of:

a) providing a plurality of dry wood layers;

b) dry gluing the dry wood layers together.

Since in the method of manufacturing the multi-layered wood composite block of the present invention the wood layers are dry, dry glued, deformation and/or discoloration of the wood layers due to moisture can be avoided.

Preferably, the cut-to-size dry wood layer and/or the cut-to-size intermediate layer are calibrated before dry gluing and/or the cured wood composite block is calibrated after dry gluing.

Even more preferably, the cut-to-size dry wood layer and the cut-to-size intermediate layer are calibrated before dry gluing and the cured wood composite block is calibrated after dry gluing.

The details described above in relation to the wood composite block according to the invention are also correspondingly applicable to the method of manufacturing a multi-layer wood composite block.

According to a preferred embodiment, the individual layers of wood are laminated on top of or adjacent to each other using a mould, wherein the mould is designed in such a way that it prevents the layers of wood from slipping.

By using the mold, slippage of the layers during bonding can be prevented, thereby ensuring the required accuracy.

Another aspect of the invention relates to a method of manufacturing a multi-layer wood veneer, comprising cutting a multi-layer wood composite block according to any one of claims 1 to 6 to form a multi-layer wood veneer.

According to a preferred embodiment, the wood composite block is sawn into multiple layers of wood veneers.

Sawing the veneer, unlike slicing, does not require any pre-treatment, such as soaking and/or steaming the wood composite block. Thus, the wood composite block is not exposed to temperature and/or humidity fluctuations that may cause deformation and/or discoloration of the composite block or individual veneers. The adhesives that can be used are less limited in options than conventional slicing processes because thermal pre-treatment of the multi-layer wood composite block is not required. Owing to this expanded choice, it is also possible to use adhesives which have particularly advantageous adhesive properties for different materials, i.e. not only for wood, but also for the material used as the intermediate layer. The method according to the invention thus provides more design options with regard to possible material combinations and corresponding accessibility designs.

Furthermore, sawing has the advantage that cracking is avoided and a wider range of materials can be used in the manufacture of the multi-layer veneer. Very hard materials, such as ironwood (i.e., various tropical woods), metals, and hard plastics, can be sawn, but cannot be sliced.

The wood composite block is sawn to cut it into multi-layered wood veneers, wherein the sawing is preferably performed using a band saw (e.g. a horizontal band saw).

According to an improved design, the cutting of the wood composite block is a cut surface of the wood layer at an angle of 0 ° to 180 °, in particular at an angle between 45 ° and 135 °. It is particularly preferred that the cutting of the wood composite block is performed perpendicular to the cut surface of the wood layer.

The wood composite block according to the invention is preferably kept dry throughout the process, i.e. without the use of water-based or solvent-based adhesives, and without the use of water soaking or steaming of the wood composite block.

In order to ensure the precision of the finished multilayer wood veneer product, attention must be paid to the range of the moisture content of the wood composite block or the single component.

Alternatively, the wood moisture can also be determined by kiln drying (DIN EN 13183-1:2002-07 and DIN EN13183-1Berichtigung 1: 2003-12).

The multilayer wood composite block is cut into multilayer wood veneers having a thickness in the range of 0.2mm and 4.0mm, preferably between 0.3mm and 1.5mm, more preferably between 0.5mm and 1.0mm, even more preferably between 0.6mm and 0.9mm by sawing or slicing, preferably by sawing or slicing in the dry state, more preferably by sawing in the dry state, wherein the thickness of the multilayer wood veneers has a tolerance of less than or equal to 0.25mm, preferably less than or equal to 0.20mm and more preferably less than or equal to 0.15 mm.

The details described above in relation to the wood veneer according to the invention are correspondingly applicable to the process of manufacturing a multi-layered wood veneer.

Another aspect of the invention relates to a multi-ply wood veneer obtainable by the method according to claims 16 to 18.

The technical effect or advantage of the wood veneer according to the invention is similar to that described for the method and the previous wood veneer.

Another aspect of the invention relates to the use of a multilayer wood veneer according to any one of claims 7 to 13 or 19 as a decorative and/or finishing element.

Furthermore, the wood veneer according to the invention can be used as a decorative element and/or a furnishing element in furniture construction, in interior fittings, in everyday articles such as mobile phones and corresponding protective covers, but also in the field of textiles and leather goods.

Preferably, the multi-layer wood veneer according to the invention is used as a decorative and/or decorative element in a vehicle interior.

The use of the multi-layer wood veneer according to the invention opens up new options compared to the prior art, as described above. On the one hand, this is due to the thinness of the veneer and therefore has a greater flexibility than a traditionally sawn veneer. On the other hand, the accessibility design can be reproduced very accurately. Furthermore, the characteristics of the wood composite structure and the method of manufacturing the veneer, in particular by sawing in the dry state, according to the invention allow the use of materials in the design and thickness that are not available for manufacturing the veneer by slicing. The present invention thus extends the scope of designs in the manufacture of veneers and makes new designs readily available which could not be manufactured with prior art means.

Another aspect of the invention relates to an article comprising a multilayer wood veneer according to any one of claims 7 to 13 or 19.

The advantages compared to the prior art are the same as described in relation to the use of wood veneers.

Drawings

The invention is explained in more detail below with reference to the description of exemplary embodiments and the accompanying drawings. Further advantages of the invention will be apparent from the following description of preferred exemplary embodiments, which, however, should not be construed as limiting in any way. All embodiments of the invention can be combined with each other within the scope of the invention.

FIG. 1 is a schematic view of a multi-layer wood composite block according to the present invention;

FIG. 2 is a schematic illustration of a multi-layer wood veneer according to the present invention;

fig. 3a-3d are schematic illustrations of the arrangement of the different layers in a wood composite block or veneer according to the invention.

Detailed Description

Fig. 1 shows a wood composite block according to the invention. The wood composite block shown comprises a plurality of wood layers (1), a plurality of adhesive layers (2) and (optionally) an intermediate layer (3). Each of the layers (1), (2) and (3) has a thickness (d), wherein the thickness (d) can be selected for each type of layer (1), (2) and (3) and each individual layer (1a), (1b), (1c) independently of the thickness (d) of the other layers.

Only one adhesive layer (2) is provided between the two wood layers (1), by means of which the wood layers (1) are bonded together. The adhesive layer (2) then forms visible thread elements in the finished multi-ply wood veneer. Optionally, the adhesive layer (2) may be colored, so that further design alternatives may be obtained.

Fig. 2 schematically shows a wood veneer according to the invention. The shown wood veneer comprises a plurality of wood layers (1) having a thickness (d), a plurality of adhesive layers (2) having a thickness (d) and an (optional) intermediate layer (3) having a thickness (d), wherein the thickness (d) of each wood layer (1), adhesive layer (2) and intermediate layer (3) can be selected independently of the plurality of layers.

The thickness of the wood veneer is between 0.2mm and 4.0mm, preferably between 0.3mm and 1.5mm, more preferably between 0.5mm and 1.0mm, and even more preferably between 0.6mm and 0.9 mm; wherein the thickness tolerance of the multilayer wood veneer is less than or equal to 0.25mm, preferably less than or equal to 0.20mm, and more preferably less than or equal to 0.15 mm.

Figures 3a-3d schematically show various possible arrangements of the wood layer (1), the adhesive layer (2) and the intermediate layer (3) in the wood composite block or veneer according to the invention.

Fig. 3a shows the simplest variant according to the invention, which comprises a plurality of (in this case two) superimposed wood layers (1) and at least one adhesive layer (2), wherein the at least one adhesive layer (2) is arranged between successive wood layers (1).

Fig. 3b shows a variant according to the invention, which comprises a plurality of superimposed wood layers (1) and a plurality of adhesive layers (2), each adhesive layer (2) being arranged between two consecutive wood layers (1).

Fig. 3c shows a variant according to the invention, which comprises a plurality of superimposed wood layers (1), a plurality of adhesive layers (2) and an intermediate layer (3) sandwiched between two wood layers (1), which intermediate layer is connected to the wood layers (1) by means of two adhesive layers (2). In other words, the intermediate layer (3) is embedded in the adhesive layer (2) that bonds the two wood layers (1) together. The intermediate layer (3) forms thread elements in the multi-layer wood veneer.

Fig. 3d shows a variant according to the invention, which comprises a plurality of superimposed wood layers (1), a plurality of adhesive layers (2) and a plurality of intermediate layers (3). As shown, the intermediate layer (3) may be embedded in an adhesive layer (2) connecting the two wood layers (1). Alternatively, several intermediate layers (3) may be embedded in the adhesive layer (2) connecting the two wood layers (1) together. The number and thickness (d) of the layers (1), (2) and (3) in the wood composite block or veneer according to the invention can be freely chosen.

List of reference numerals

(1): wood layer

(2): adhesive layer

(3): intermediate layer

(d) The method comprises the following steps Layer thickness

(s): thickness of

(x) The method comprises the following steps Width of

(y): height

(z): depth of field

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Multi-layer wood composite block, multi-layer wood veneer and manufacturing method thereof

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