FR2648075A1 - Process for producing a decorative design in wood and decorative design thus obtained - Google Patents

Abstract

The present invention relates to a process for producing a decorative design in wood, and to a decorative design obtained by use of this process. Process, characterised in that it consists essentially in arranging, directly by adhering to a support or by inserting in a mould, pieces of wood 1 of different shapes and/or sizes and/or different species, according to a preestablished matrix, in filling the spaces between the edges of the said pieces 1 with a polyurethane resin 2 and in then carrying out polymerisation of the said resin 2.

Description

Method of making a decorative wooden pattern
and decorative pattern thus obtained
The present invention relates to the field of construction, in particular floor, wall or ceiling coverings and relates to a process for producing a decorative wooden motif.

 The subject of the invention is also a decorative pattern obtained by application of this method.

 I1 currently exists, more particularly for the production of parquet floors, panels having various patterns and the various constituent parts of which are held together by a weft of string or by a sheet of kraft paper, these panels being intended to be glued to a screed or on particle board.

 There are also parquet panels glued to a support formed by intersecting layers of wood.

 These known parquet panels all have perfectly contiguous and generally the same size wooden slats.

 It is also known to produce wall or ceiling coverings in boxes formed by prefabricated parts in the workshop and assembled and fixed on site. Likewise, there are wall and ceiling coverings made up of an assembly of friezes or paneling.

 The coverings in the form of boxes generally make it possible to obtain very aesthetic decorative elements but are not in principle applicable to the production of floor coverings.

 The coverings made up of frieze assemblies allow the implementation of friezes of different dimensions, but only in length on the same assembly line, the friezes of different widths always having to be mounted on different lines, so that variations aesthetic involving friezes of different widths are not possible in the same alignment.

 In addition, these known coatings generally require relatively long finishing work and skilled labor for their installation, the consistency of the joints between elements depending directly on the know-how of the operator.

 The present invention aims to overcome these drawbacks.

 It has, in fact, for object a process for producing a decorative wooden pattern, characterized in that it essentially consists of having, according to a pre-established matrix, directly by gluing on a support or by placing in a mold, pieces of wood of different shapes and / or dimensions and / or of different essences, filling the gaps between the edges of said pieces with a polyurethane resin, then carrying out the polymerization of said resin.

 The invention also relates to a wooden decorative pattern characterized in that it is essentially constituted by pieces of wood of different shapes and / or sizes and / or different essences and by a polyurethane resin for jointing between the pieces of wood.

 In addition, the subject of the invention is a device for the industrial implementation of the method described above, characterized in that it is essentially constituted by a mold, of which at least the matrix has on its bottom ribs of very low height arranged in a predetermined matrix, forming between them geometric drawings corresponding to the shapes and dimensions of the various pieces of wood and realizing the spacing between said pieces, said mold being provided, in addition, with a resin injection nozzle .

The invention will be better understood from the following description, which relates to a preferred embodiment, given by way of nonlimiting example, and explained with reference to the appended schematic drawing, in which
FIG. 1 is a plan view of a pattern according to the invention, and
FIG. 2 is a plan view of a device for the industrial implementation of the process for producing the pattern according to FIG. 1.

 As shown in FIGS. 1 and 2 of the appended drawing, the method for producing a decorative wooden pattern essentially consists in placing, according to a pre-established pattern, directly by gluing on a support or by placing in a mold 3, pieces of wood; of different shapes and / or dimensions and / or of different essences, filling the intervals between the edges of said pieces 1 with a polyurethane resin 2, then carrying out the polymerization of said resin 2.

 The matrix used to make the arrangement of the pieces 1 is advantageously determined by computer, as well as the dimensions and shapes of the pieces 1.

 This matrix can be reproduced manually on a support, with a view to manual positioning of the parts 1 by bonding to the support, or even be reproduced in the matrix of a mold for industrial implementation of the process.

In the case of an entirely manual production, the filling of the intervals between the edges of the parts 1 is advantageously carried out by spreading the resin over the parts 1 by means of a ra this
In the case of an industrial production of the decorative pattern, in the form of a pannea, the filling of the intervals between the edges of the parts 1 can be carried out, either by injection, namely after closing the mold and putting it under vacuum, then by injecting the resin through one or more mold inlets with simultaneous purging for air, either by spreading the resin over the parts 1 placed in the mold 3, then by compressing the resin during closing the mold 3, which is then heated for the rapid polymerization of the resin.

The polyurethane resin used advantageously has the following general composition - polyester, as known under the trade name
ciale Desmophène 1920 U or 1150 U from the company Bayer - polyester, as known under the trade name
ciale Desmophène 550 U from the company Bayer - mica - quartz flour - metallic color filler, as known under the
trade name Bayferox of the company Bayer - internal wetting agent and release agent, as known
under the trade name Pat 660 from the company Wùrth - anti-foam - paste humidity sensor, as known under the name
Baylith mination from Bayer - pasty filler reacting to moisture, such as
naked under the trade name Zéolith de la so
ciety Bayer - hardener in the form of an isocyanate, as known
under the trade name Desmodur VL de la so
Bayer.

 To make a white joint, the mica is replaced by titanium oxide.

For the production of a black joint, the polyurethane resin advantageously has the following composition - polyester, as known under the trade name
ciale Desmophène 1920 U from Bayer - polyester, as known under the trade name
ciale Desmophène 550 U from Bayer - black rubber powder - carbon black - internal wetting agent and release agent, as known
under the trade name Pat 660 from the company Würth - anti-foam - paste humidity sensor, as known under the name
Baylith mination from Bayer - pasty filler reacting to moisture, such as
naked under the trade name Zéolith de la so
ciety Bayer - hardener in the form of an isocyanate, as known
under the trade name Desmodur L of the so
Bayer.

 This resin can, in addition, in known manner, be colored in the mass. Thus, it is possible to make color variations depending on the uses.

By way of example, the polyurethane resin used advantageously has the preferred general composition, by weight, according to polyester, as known under the name
Desmophene 1920 U or 1150 U commercial
company Bayer 38.90 - polyester, as known under the name
Desmophene 550 U of the company
Bayer 27.40 - mica 8.80 - quartz flour 8.80 - metallic color filler, as known
under the trade name Bayferox from
Bayer 2,8C - internal wetting agent and release agent, such
than known under the trade name
Pat 660 from the company Würth 0.20 - anti-foam 0.80 - humidity sensor in paste, as known under
the name Baylith from the company Bayer 7.90 - pasty filler reacting to moisture, such
than known under the trade name
Zeolite from Bayer 44.00 - hardener in the form of an isocyanate, such as
known under the trade name
Desmodur VL from Bayer 44.20
For ia production of a black joint, the polyurethane resin advantageously has the preferred composition, by weight, as follows - polyester, as known under the name
Desmophene 1920 U of the company
Bayer 38.90 - polyester, as known under the name
Desmophene 550 U of the company
Bayer 27.40 - black rubber powder 13.27 - carbon black 4.40 - internal wetting agent and release agent, such as
known under the trade name Pat 660
from Würth 0.20 - anti-foam 0.80 - paste humidity sensor, as known under
the name Baylith from the company Bayer 7.90 - pasty filler reacting to moisture, such
than known under the trade name
Zeolite from Bayer 4.40 - hardener in the form of an isocyanate, such as
known under the trade name
Desmodur L from Bayer. 44.20
This resin has a density comparable to that of wood, as well as an elasticity allowing the adaptation of wood to humidity variations, machinability identical to that of wood and rapid polymerization, as well as an ability to fill all cracks and all dead knots in the wood, thus allowing practically fall-free use and, finally, possible variations in color.

 The invention also relates to a decorative wooden pattern obtained by implementing the method described above and characterized in that it essentially consists of pieces of wood 1 of different shapes and / or sizes and / or of different species and with a polyurethane resin 2 for jointing between the pieces of wood 1.

 The pieces of wood 1 are advantageously of constant thickness, for example 8 mm thicker, but of different shapes and dimensions and / or constituted by one or more hardwood species, namely, for example, those commonly used , such as oak, chestnut, beech or, less commonly, such as ash, elm, maple, plane tree or almond tree. Similarly, it will also be possible to use exotic woods, such as sipo, bété, etc.

 According to another characteristic of the invention, the decorative pattern is advantageously in the form of a panel produced by molding the pieces of wood 1 and connecting them together by means of a joint 2 made of polyurethane resin, this panel being preferably provided, on half of its circumference, with a resin joint 2.

 The invention also relates to a device for the industrial implementation of the method described above, characterized in that it is essentially constituted by a mold 3, of which at least the matrix has on its bottom ribs 4 of very low height arranged in a predetermined matrix, forming between them geometric drawings corresponding to the shapes and dimensions of the various pieces of wood 1 and making the spacing between said pieces 1 (Figure 2).

 In accordance with another characteristic of the invention, the mold 3 is further provided with a resin injection nozzle 5 (FIG. 2).

 According to a characteristic of the invention, not shown in the accompanying drawing, the cover of the mold 3 is advantageously also provided with ribs of very low height disposed on the internal face of said cover, so as to form the image of the ribs 4 of the bottom of the mold matrix 3. Thus, it is possible to achieve total and perfectly secure maintenance of the pieces of wood 1 inside the mold 3, after closing the latter and during the injection and polymerization operations of the polyurethane resin 2.

 Thanks to the invention, it is possible to produce decorative patterns in wood, in particular in the form of ready-to-install parquet panels, either on a cement screed or on a coating of particle board, with fixing by gluing and adjustment. by cooperation of the edges of said panels.

 In known manner, these panels can have the same dimensions as the existing parquet panels, and the wood used will advantageously have a low humidity.

According to the invention, it is also possible to arrange the pieces of wood 1 individually directly on a screed or other homogeneous coating and to glue them using resin or another suitable glue, the filling of the joints being carried out. subsequently with the polyurethane resin and a final sanding, in particular of the joints, finishing the installation operation before the varnishing of the assembly. Such a method is particularly suitable for the
production of complex decorative patterns such as mosques.

 The decorative panel obtained in accordance with the invention can also be used for the production of wall decorations or ceilings, the latter possibly being in particular of the box type.

 Finally, the use of a computer program for the determination of a matrix for the arrangement of the pieces of wood 1 and of the shapes and dimensions of the latter allows very many aesthetic variations, as well as a rapid representation of the repetition of the plates individual over a large area with staggered assembly or in any other way.

 Of course, the invention is not limited to the embodiment described and shown in the accompanying drawing. Modifications remain possible, in particular from the point of view of the constitution of the various elements or by substitution of technical equivalents, without thereby departing from the scope of protection of the invention.

Claims (15)

 1. A method of producing a decorative wooden pattern, characterized in that it essentially consists of having, in a pre-established matrix, directly by bonding to a support or by placing in a mold (3), pieces of wood (1) of different shapes and / or sizes and / or of different species, filling the gaps between the edges of said pieces (1) with a polyurethane resin (2), then carrying out the polymerization of said resin (2).  2. Method according to claim 1, characterized in that the matrix used to make the arrangement of the parts (1) is advantageously determined by computer, as well as the dimensions and shapes of the parts (1).  3. Method according to any one of claims 1 and 2, characterized in that the matrix is reproduced manually on a support, with a view to manual positioning of the parts (1) by bonding to the support, or else is reproduced in the matrix of a mold (3) for an industrial implementation of the process.  4. Method according to any one of claims 1 to 3, characterized in that, in the case of an entirely manual embodiment, the filling of the intervals between the edges of the parts (1) is advantageously carried out by spreading the resin above the parts (1) by means of a squeegee.  5. Method according to any one of claims 1 to 3, characterized in that, in the case of an industrial production of the decorative pattern, in the form of a panel, the filling of the intervals between the edges of the parts (1) is carried out either by injection, namely after closing the mold and placing the latter under vacuum, then by injection of the resin through one or more mold inlets (3) with simultaneous purging for air, or by spreading the resin over the parts (1) arranged in the mold (3), then by compressing the resin when the mold (3) is closed, which is then heated for rapid polymerization of the resin .  6. Method according to any one of claims 1, 4 and 5, characterized in that the polyurethane resin used advantageously has the following general composition - polyester, as known under the trade name  ciale Desmophène 1920 U or 1150 U from the company Bayer - polyester, as known by the trade name  ciale Desmophène 550 U from the company Bayer - mica - quartz flour - metallic color filler, as known under the  trade name Bayferox of the company Bayer - internal wetting agent and release agent, as known  under the trade name Pat 660 from the company Würth - anti-foam - paste humidity sensor, as known under the name  Baylith mination from Bayer - pasty filler reacting to moisture, such as  naked under the trade name Zéolith de la so  ciety Bayer - hardener in the form of an isocyanate, as known  under the trade name Desmodur VL de la so  Bayer.  7. Method according to any one of claims 1 and 6, characterized in that, for the production of a white joint, ie mica is replaced by titanium oxide.  8. Method according to any one of claims 1, 4 and 5, characterized in that, for the production of a black joint, the polyurethane resin advantageously has the following polyester composition, as known under the trade name  ciale Desmophène 1920 U from Bayer - polyester, as known under the trade name  ciale Desmophène 550ça from Bayer - black rubber powder - carbon black - internal wetting agent and release agent, as known  under the trade name Pat 660 from the company Wùrth - anti-foam - paste humidity sensor, as known under the name  Baylith mination from Bayer - pasty filler reacting to moisture, such as  naked under the trade name Zéolith'de la so  ciety Bayer - hardener in the form of an isocyanate, as known  under the trade name Desmodur L of the so  Bayer.  9. Method according to claim 6, characterized in that the polyurethane resin used advantageously has the preferred general composition, by weight, as follows - polyester, as known under the name  Desmophene 1920 U or 1150 U commercial  company Bayer 38.90 - polyester, as known under the name  Desmophene 550 U of the company  Bayer 27.40 - mica 8.80 - quartz flour 8.80 - metallic color filler, as known  under the trade name Bayferox from  Bayer 2.80 - internal wetting agent and release agent, such  than known under the trade name  Pat 660 from the company Würth 0.20 - anti-foam 0.80 - humidity sensor in paste, as known under  the name Baylith from the company Bayer 7.90 - pasty filler reacting to moisture, such  than known under the trade name  Zeolite from Bayer 44.00 - hardener in the form of an isocyanate, such as  known under the trade name  Desmodur VL from Bayer 44.20  10. A method, as claimed in claim 8, characterized in that, for the production of a black joint, the polyurethane resin advantageously has the preferred composition, by weight, as follows - polyester, as known under the name  Desmophene 1920 U of the company  Bayer 38.90 - polyester, as known under the name  Desmophene 550 U of the company  Bayer 27.40 - black rubber powder 13.27 - carbon black 4.40 - internal wetting agent and release agent, such as  known under the trade name Pat 660  from Würth 0.20 - anti-foam 0.80 - paste humidity sensor, as known under  the name Baylith from the company Bayer 7.90 - pasty filler reacting to humidity, such  than known under the trade name  Zeolite from Bayer 4.40 - hardener in the form of an isocyanate, such as  known under the trade name  Desmodur L from Bayer 44.20  11. Decorative wooden pattern, obtained by implementing the method according to any one of claims 1 to 10, characterized in that it is essentially constituted by pieces of wood (1) of different shapes and / or dimensions and / or of different species and with a polyurethane resin (2) for jointing between the pieces of wood (1).  12. Pattern according to claim 11, characterized in that it is advantageously in the form of a panel produced by molding the pieces of wood (1) and connection of the latter to each other by means of a seal (2) in polyurethane resin, this panel being preferably provided, on the half of its periphery, with a resin joint (2).  13. Device for the industrial implementation of the method according to any one of claims 1 to 3 and 5 to 10, characterized in that it is essentially constituted by a mold (3), at least the matrix of which is present on its bottom of the ribs (4) of very low height arranged in a predetermined matrix, forming between them geometric drawings corresponding to the shapes and dimensions of the various pieces of wood (1) and realizing the spacing between said pieces (1)  14. Device according to claim 13, characterized in that the mold (3) is further provided with a nozzle (5) for injecting resin.  15. Device according to any one of claims 13 and 14, characterized in that the mold cover (3) is advantageously also provided with ribs of very low height disposed on the internal face of said cover, so as to form the image of the ribs (4) at the bottom of the mold matrix (3).