Multilayer structure for producing a floor covering

Abstract

The invention relates to a multilayer structure for producing a floor covering, the multilayer structure (1) not having coupling means and comprising, in sequence: - an upper PVC wear layer (2) comprising 20 to 70 PHR of plasticiser and having a thickness of between 0.2 and 2 mm, preferably between 0.4 and 1 mm; - a first reinforcing frame (3); -a plasticised PVC bonding layer (4) for bonding the reinforcing frame (3) to a back layer (5); - the back layer (5) which is made of compact PVC and comprises 40 to 60 PHR of plasticiser and a filler content of greater than 130 PHR, or even greater than 150 PHR, or even greater than 200 PHR and up to 250 PHR; - a foamed sub-layer (6) which is made of plasticised and filled PVC; the back layer (5) having a thickness of between 0.4 and 2 mm, and the bonding layer (4) comprising from 20 to 70 PHR of plasticiser and a filler content of less than 5 wt.% of the bonding layer (4) and having a thickness of between 0.05 and 0.5 mm.

Description

Description Title of the invention: Multi-layer structure for producing a floor covering Technical field

[0001] The present invention relates to a multi-layer structure with acoustic insulation properties, without coupling means and presented in tiles, strips, for the production of a floor covering in semi-loose installation using a tackifier or double-sided adhesive, or even in glued installation, or presented in rolls for the production of a floor covering in loose installation. Prior art

[0002] Known from the state of the art is a multi-layer structure without coupling means, presented in slabs, strips, or rolls, for the production of a floor covering with acoustic insulation properties.

[0003] This multi-layer structure comprises successively, that is to say from the top to the ground: - a top wear layer made of plasticized PVC, with a thickness of between 0.3 and 2 mm; - a compact, plasticized PVC backing layer, i.e. not foamed, obtained not by coating, but rather by calendering, pressing or extrusion, the backing layer is plasticized and with a filler rate greater than 130 PCR (per hundred parts of resin), or even greater than 150 PCR; - a foamed underlayer made of plasticized and loaded PVC.

[0004] In order to facilitate installation and improve the dimensional stability of this type of floor covering, it is known that the backing layer includes a reinforcing reinforcement, such as a glass veil coated with a gelled PVC plastisol on both sides and placed in contact with the wear layer.

[0005] To facilitate installation, especially loose installation, the structure must be balanced and, to do this, it is known to add fillers to the PVC backing layer or increase its thickness to have a thickness greater than 2 mm. However, too great an increase in the thickness of the backing layer can degrade the sound insulation performance of the structure. Conversely, an increase in the thickness of the foamed underlay degrades the punching resistance.

[0006] Furthermore, for areas larger than 30 m 2 , or even greater than 50 m 2 , the installation of this type of covering in rolls still requires the use of glue to ensure support.

[0007] The resulting disadvantage is that the total thickness of the structure becomes too great, especially if the thickness is greater than 6 mm, which results in an excessive weight, in the order of 6 to 10 kg / m2 , and therefore logistical difficulties and environmental impact issues.

[0008] Document EP3505342 describes the implementation of a second reinforced layer with a second reinforcing frame, which makes it possible to stiffen the structure and form a so-called "bimetallic" effect, contributing to the weighting effect of the slab, which makes it easier to install. However, this type of structure does not allow the use of materials from recycled PVC in its composition.

[0009] Another disadvantage of the prior art is encountered when the upper wear layer is transparent, with 20 to 50 PCR of plasticizer, and a filler rate of zero, or even less than 5% by weight of the upper layer.

[0010] In this situation, the low amount of charge causes, during the manufacture of the structure, a shrinkage of the wear layer which generates the phenomenon well known to those skilled in the art under the English term of "curving", in which the periphery of the multi-layer structure rises, which creates an imbalance.

[0011] Another disadvantage of the prior art is encountered when the PVC foamed underlay has a plasticizer level of between 20 and 60 PCR, and a filler level of less than 130 PCR, or even less than 100 PCR.

[0012] In this situation, the difference in load rate with the backing layer causes, during the manufacture of the structure, a shrinkage of the foamed underlayer which causes the phenomenon of curvature in French, contributing to the imbalance. Statement of the invention

[0013] One of the aims of the invention is therefore to propose a multi-layer structure for the production of a floor covering, which is balanced, suitable for loose laying in the case of rolls, and without coupling means, with satisfactory rigidity to withstand the passage of heavy loads, while presenting an acoustic attenuation greater than 15 dB or even 19 dB according to NF EN ISO 717-2 May 2013 and NF EN ISO 10140-3 July 2021 and a walking sound level less than 65 according to NF EN 16205 August 2013 / NF EN 16205 / IN1 May 2018 / NF S 31-074.

[0014] For this purpose, a multi-layer structure has been developed for the production of a floor covering without coupling means and comprising successively, that is to say from the top to the ground: - a PVC top wear layer comprising 20 to 70 PCR of plasticizer, preferably 20 to 50 PCR of plasticizer (PCR means per hundred parts of resin), and having a thickness of between 0.2 or even 0.3 and 2 mm, preferably between 0.4 or even 0.5 and 1 mm; - a first reinforcement frame; - a layer of plasticized PVC bonding to bond the reinforcement to a backing layer; - said backing layer, which is made of compact PVC and comprises 40 to 60 PCR of plasticizer, and a loading rate greater than 130 PCR, or even greater than 50 PCR, or even greater than 200 PCR and up to 250 PCR; - a foamed underlayer made of plasticized and loaded PVC.

[0015] According to the invention, the backing layer has a thickness of between 0.4 and 2 mm, preferably between 0.6 and 1.5 mm, and the bonding layer comprises from 20 to 70 PCR of plasticizer and a filler content of less than 5% by weight of the bonding layer, or even a zero filler content, and has a thickness of between 0.05 and 0.5 mm, preferably between 0.1 and 0.3 mm. Preferably, the bonding layer comprises from 20 to 50 PCR of plasticizer.

[0016] The presence of the bonding layer according to the invention makes it possible to balance the structure, without requiring an increase in the thickness of the loaded PVC backing layer.

[0017] In practice, the presence of the bonding layer according to the invention, which is plasticized and which comprises a low filler rate, makes it possible to generate the phenomenon of reverse curvature of the wear layer, well known to those skilled in the art under the English term "doming" in which the edges of the structure lower (or the center rises), creating a reverse imbalance which therefore compensates and rebalances the structure.

[0018] Given the low charge rate in the bonding layer, it has a lower surface mass than the backing layer which is charged and therefore heavier. In other words, the invention makes it possible to rebalance the structure, with a lower weight, compared to the known solution consisting of increasing the thickness of the backing layer, while preserving the acoustic and punching resistance performance of the structure.

[0019] The high level of plasticizer in the backing layer increases the flexibility of the structure. The presence of the bonding layer according to the invention therefore also makes it possible to stiffen the multi-layer structure with a minimum of material, in order to facilitate installation, reduce the weight compared to the prior art, and consequently reduce the environmental impact.

[0020] In a particular embodiment, the upper wear layer is transparent and comprises 30 to 50 PCR of plasticizer, with a loading rate of zero, or even less than 5% by weight of the upper layer, and the multi-layer structure comprises a decor layer positioned under the upper wear layer.

[0021] In a particular embodiment, the upper wear layer has a chamfer on its upper face and on at least one edge of the roller or slab or blade, preferably on all four edges. The presence of a chamfer can lead to a reduction in the traffic resistance performance of the structure, this generating a “starter” zone for the structure to detach. This effect is limited by the characteristics of the multilayer structure according to the invention.

[0022] The decorative layer may, for example, be in the form of a layer of ink printed on a lower face of the wear layer, or on an upper face coated with the first reinforcement, or on an upper face of a decorative film positioned under the wear layer.

[0023] In this configuration, the low load rate in the upper wear layer of plasticized PVC causes the phenomenon of "curving" or incurvation tending to unbalance the multi-layer structure, compensated by the bonding layer.

[0024] According to another embodiment, the wear layer may be in the form of a layer of pressed granules, so that the wear layer itself forms the decoration. The granules may be of any desired color, as is well known in the prior art.

[0025] The layer of pressed granules is obtained from plasticized and loaded PVC. Generally, the loading rate of the pressed granules is much lower than 130 PCR, preferably lower than 100 PCR or even 80 PCR in order to have good scratch resistance. The layer of pressed granules thus tends to generate a phenomenon of "curving" or incurvation tending to unbalance the multi-layer structure, which is compensated by the bonding layer.

[0026] Advantageously, the multi-layer structure comprises a second reinforcing frame, embedded in the surface of the backing layer and also bonded to a lower face of the first reinforcing frame by the bonding layer.

[0027] Alternatively, the multi-layer structure comprises a second reinforcing frame, embedded on the back face of the backing layer, on the surface of the underlayer so as to produce a bimetallic effect. This is for example directly bonded to the underlayer during the manufacture of the structure by coating the PVC plastisol underlayer on the second reinforcing frame and then gelling.

[0028] This second frame improves the rigidity of the multi-layer structure, and in particular improves the resistance test for the rolling chair.

[0029] The bonding layer is for example a layer of plastisol, preferably a PVC plastisol. This makes it possible in particular to simplify the manufacturing process of the multilayer structure by coating a PVC plastisol on the first reinforcement or on the surface of the backing layer, then bringing the assembly formed by the wear layer, the first reinforcement reinforcement and the backing layer into contact and gelling the plastisol so as to obtain the bonding layer and bind the assembly.

[0030] Preferably, the foamed underlayer has a thickness of between 1 and 3 mm, preferably between 1.5 and 2.2 mm. Preferably, the foamed underlayer contains 20 to 70 PCR of plasticizer. Preferably, the foamed underlay has a charge rate of less than 130 PCR, or even less than 100 PCR.

[0031] The total thickness of the multi-layer structure is generally between 3.5 and 6mm, preferably between 4 and 5mm.

[0032] A method for obtaining the multilayer structure according to the invention may also comprise the following steps: - coating and gelling of a PVC plastisol on both sides of a glass veil in order to obtain a decorative layer and a compact bonding layer, on either side of the glass veil; - printing a decoration on the decoration layer; - coating and gelling of a top wear layer from a PVC plastisol on the decorative layer; - coating and gelling of the bonding layer on the compact bonding layer from a PVC plastisol; - obtaining by calendering, extrusion or pressing and hot laminating of the PVC backing layer on the bonding layer, the backing layer having a reinforcing grid entirely embedded on its surface opposite the bonding layer; - coating and gelling of the foamed underlayer on the backing layer from a PVC plastisol.

[0033] According to another embodiment, the bonding layer can also be made by a lower impregnation layer of plastisol, such as a gelled PVC plastisol, and a glass veil which comprises the first reinforcing frame. In this situation, the decorative layer can be printed on an upper layer of plastisol, such as a PVC plastisol, coated on the glass veil and then gelled.

[0034] According to particular embodiments, the first and / or the second reinforcement frame is in the form of a glass veil, a glass grid, or a glass grid and glass veil complex, in particular to satisfy the tests of resistance to the passage of heavy loads and punching. Brief description of the drawings

[0035] Other characteristics and advantages of the invention will emerge clearly from the description given below, for information purposes only and in no way limiting, with reference to the appended figures in which:

[0036] [Fig.1] is a schematic cross-sectional representation of one embodiment of the multi-layer structure of the invention.

[0037] [Fig.2] is a schematic cross-sectional representation of another embodiment of the multi-layer structure of the invention incorporating a printed decorative layer.

[0038] [Fig.3] is a schematic cross-sectional representation similar to that of Figure 2, with the decor layer printed on a polymer film.

[0039] [Fig.4] is a schematic representation, in section similar to that of figure 2, the decorative layer being printed on a glass veil coated on both sides with a PVC plastisol.

[0040] [Fig.5] is a schematic representation, in section similar to that of Figure 1, the structure integrating a second reinforcement frame embedded in the surface of the backing layer and linked to the first frame by a bonding layer.

[0041] [Fig.6] is a schematic representation, in section similar to that of figure 1, the structure integrating a second reinforcement frame embedded in the back face of the backing layer.

[0042] [Fig.7] is a schematic representation, in section similar to that of figure 5, the multi-layer structure integrating a decorative layer, for example conforming to that of figure 4. Detailed description of the invention

[0043] The invention relates to a multi-layer structure (1) with acoustic insulation properties, without coupling means and presented in tiles, strips, for the production of a floor covering in semi-loose installation using a tackifier or double-sided adhesive, or even in glued installation, or presented in rolls, for the production of a floor covering in loose installation.

[0044] The multilayer structure (1) according to the invention can have any shape, in particular in panel, slab or blade, and can be wound on itself or on a mandrel to be presented in a roll.

[0045] When presented in a roll, the multi-layer structure has a flexibility that allows it to comply with ISO 24344:2008. In this standard, flexibility is defined as the ability of a covering or a layer of a floor covering to be rolled around a 20 mm mandrel, without cracks or crazing forming. Thus, the multi-layer structure according to the invention subjected to this test would not exhibit breaks, cracks, crazing and other permanent defects.

[0046] With reference to Figure 1, the multi-layer structure (1) comprises successively, from the top towards the ground, an upper wear layer (2) made of plasticized PVC, a first reinforcing frame (3), a bonding layer (4) made of plasticized PVC making it possible to bond the reinforcing frame (3) to a backing layer (5), a compact backing layer (5) made of plasticized and loaded PVC, and a foamed underlayer (6) made of plasticized PVC intended to form the last layer of the structure, in particular with a view to being in contact with the ground.

[0047] The upper wear layer (2) allows control of slipperiness, wear resistance, ease of cleaning. It comprises 20 to 70 PCR of plasticizer, preferably 20 to 50 PCR of plasticizer, and has a thickness of between 0.2 or even 0.3 and 2 mm, preferably between 0.4 or even 0.5 and 1 mm.

[0048] The upper wear layer (2) can be obtained by extrusion, by calendering, by pressing, or by coating and then gelling a plastisol. The upper wear layer (2) can be coated with a varnish without departing from the scope of the invention, such as a varnish based on polyurethane or urethane acrylate. The upper wear layer (2) can be varnished and / or grained in order to improve resistance to staining and scratching.

[0049] The upper wear layer (2) can also serve as a decoration, particularly if it is obtained from a tinted plastisol or by pressing tinted granules.

[0050] The bonding layer (4) comprises from 20 to 70 PCR of plasticizer and a filler rate of less than 5% by weight of the bonding layer, or even a filler rate zero, and has a thickness of between 0.05 and 0.5mm, preferably between 0.1 and 0.3mm. Preferably the bonding layer comprises 20 to 50 PCR of plasticizer. The bonding layer (4) is preferably obtained by coating or is hot rolled after having been obtained by calendering or extrusion. The bonding layer (4) can be related to the upper wear layer (2), in terms of composition and properties, and therefore makes it possible to balance the structure by counteracting the curvature phenomenon generated by the upper wear layer (2), with a low weight compared to the backing layer (5) (at equivalent thickness).

[0051] Preferably, the upper wear layer (2) and the bonding layer (4) are obtained from plasticized PVC and have the same plasticizer content.

[0052] Preferably, and with reference to figure 2, the upper wear layer (2) is transparent or translucent so that a decorative layer (7) is visible through the upper wear layer (2).

[0053] In this configuration, the upper wear layer (2) comprises 30 to 50 PCR of plasticizer, and a zero filler rate, or even less than 5% by weight of the upper wear layer (2), and the decorative layer (7) can be printed on a lower face of the upper wear layer (2), or on an upper face coated with the reinforcement, or on a polymer film (8) such as a PVC film, see figure 3, printed by any known technique and positioned under the upper wear layer (2).

[0054] The first reinforcement frame (3) can be a glass grid, a glass fiber veil.

[0055] In order to combine the advantages of the various existing solutions, the frame includes a glass veil, which is complexed with the glass grid by means of a binder, preferably by lamination.

[0056] In order to bond the glass veil with the glass grid without complicating the manufacturing process or unduly weighing down the structure, the binder comprises an acrylic glue, or ethylene-vinyl acetate ("EVA"), or plastisol such as a PVC plastisol. Preferably the binder is arranged in a thin layer, at a density of between 5 and 35 g / m 2 , or preferably between 10 g / m 2 at 30 g / m 2 .

[0057] For example, the glass veil comprises glass fibres of approximately 10 pm in diameter and 10 mm in length, distributed randomly and linked together by a modified polyvinyl alcohol.

[0058] Glass veil generally has a surface mass of between 30 g / m 2 and 100 g / m 2 The tensile strength of a reinforcing web is generally chosen to be between 100 N / 50mm and 400 N / 50mm in the longitudinal and transverse directions, measured according to the ISO 1924 / 2 method.

[0059] The threads of a glass grid according to the invention are for example obtained from glass fibers, and are preferably spaced from each other by between 1 mm and 5 mm, preferably by between 2 mm and 4 mm, depending on the longitudinal and transverse dimensions, and have a linear mass of between 20 g / m and 110 g / m, advantageously between 35 g / m and 70 g / m. A glass grid generally has a thickness of between 0.1 mm and 1 mm and a surface mass of between 30 g / m2 and 150 g / m2, preferably between 45 g / m2 and 110 g / m2. The tensile strength of a reinforcing grid according to the invention is advantageously between 400 N / 50 mm and 1000 N / 50 mm in the longitudinal and transverse directions.

[0060] The first reinforcing frame (3) makes it possible to improve the dimensional stability of the multi-layer structure (1) as well as the resistance to punching. The multi-touch structure according to the invention can claim the U2SP3 or even U4P3 classification according to the UPEC standard.

[0061] The first reinforcing frame (3) may be bonded to the decorative layer (7) and to the backing layer (5) by any means, in particular by thermolamination, cold bonding, hot bonding, extrusion of the layer(s) onto the first reinforcing frame (3), by powdering with hot melt glue or by using a double-sided adhesive. If the first reinforcing frame (3) is bonded by thermolamination, this directly penetrates the thickness of the backing layer (5) and the decorative layer (7) which then impregnate the first reinforcing frame (3).

[0062] According to a particular embodiment, see figure 4, the first reinforcing frame (3) is a glass veil impregnated on its lower face with a bonding layer in the form of a gelled plastisol (9), such as a PVC plastisol, and on its upper face of a plastisol, such as a PVC plastisol, gelled and printed with a decorative layer (7).

[0063] The backing layer (5) is made of compact plasticized polyvinyl chloride, i.e. it is not foamed.

[0064] The backing layer (5) has a thickness of between 0.4 and 2 mm, preferably between 0.6 and 1.5 mm and is calendered, pressed, or extruded. Generally, a calendered backing layer (4) is preferred because it is easier to integrate recycled material into its composition with this manufacturing technique, without degrading the decoration or the appearance of the multilayer structure (1). The backing layer (5) comprises between 40 and 60 PCR, preferably between 50 and 55 PCR of plasticizer and a filler rate greater than 130 PCR, preferably greater than 150 PCR, more preferably greater than 200 PCR and up to 250 PCR.

[0065] With reference to Figure 5, the multilayer structure (1) preferably comprises a second reinforcing frame (10) to increase rigidity and improve dimensional stability and in the form of a glass veil, a glass grid, or a glass grid and glass veil complex.

[0066] The second reinforcing frame (10) is embedded in the surface of the backing layer (4) so ​​as to limit the deformation of the decorative layer (7), and is bonded to a lower face of the first reinforcing frame (3) by the bonding layer (4) in particular in the form of a plastisol, preferably a PVC plastisol.

[0067] Alternatively and with reference to Figure 6, the second reinforcing frame (10) is embedded in the reverse face of the reverse layer (5) so as to produce a bimetallic effect.

[0068] The backing layer (5), preferably calendered, loaded and plasticized, increases the mass and flexibility of the structure, in combination with the bonding layer (4) which makes it possible to stiffen the structure, the stability of the structure is improved and its installation is facilitated.

[0069] With reference to Figure 7, the multi-layer structure according to Figure 5 can integrate a decorative layer conforming to that of Figure 4.

[0070] The plasticizers used in the multilayer structure (1) are of all well-known types, such as Diisononyl Phthalate (DINP), Diisodecyl Phthalate (DIDP), 2-Ethylhexyl Diphenyl Phosphate (DPO), Dioctyl Terephthalate (DOTP), 1,2-cyclohexane dicarboxylic acid diisononyl ester (DINCH), plasticizers of the benzoate family, plasticizers of the adipate family, plasticizers marketed under the PEVALEN® brand by the company Perstorp, epoxidized soybean oil (HSE), octyl epoxy stearate (ESO), totally or partially bio-sourced plasticizers such as, for example, plasticizers of the polysorb® exelD 37 range marketed by the company Roquette Pharma, plasticizers of the range Citrofol® marketed by Jungbunzlauer International AG, or the Soft-n-safe® range of plasticizers marketed by Danisco. Liquid plasticizers can be used alone or in a mixture.

[0071] The fillers used in each of the layers of the structure may be calcium carbonate, clay, silica, kaolin, or talc. This is preferably a powdered material to prevent the filler from degrading during mixing of the PVC masterbatch intended to form the layers, but fibers may be considered. The fillers can be used alone or in a mixture.

[0072] Preferably, the foamed underlayer (6) has a thickness of between 1 and 3 mm, preferably between 1.5 and 2.2 mm.

[0073] The total thickness of the multi-layer structure is generally between 3.5 and 6mm, preferably between 4 and 5mm.

[0074] Tests were carried out by the Applicant on the following multi-layer structure (1), in accordance with the invention, and comprising from top to bottom: - 0.01 mm acrylic varnish (not shown); - wear layer (2) in 0.65mm plasticized PVC, obtained by coating with a plastisol; - 0.6mm bonding layer (9) and 0.2mm printed decorative layer (7), on either side of a glass veil (3), obtained by coating with a plastisol; - 0.2mm bonding layer (4), obtained by coating with a plastisol; - calendered backing layer (5) of 0.6mm with glass grid on the surface opposite of the bonding layer; - foamed underlayer (6) of 2.09 mm, obtained by coating with a plastisol.

[0075] The coating comes in the form of 1250 mm by 245 mm long strips. The calendered backing layer comprises approximately 30% recycled material by weight.

[0076] Total thickness: 4.35 mm, surface mass of 3785 g / m 2 .

[0077] Table 1 0078] The above values ​​are values ​​measured according to the following standards: Total thickness: NF EN ISO 24346 April 2012 Layer thicknesses: NF EN ISO 24340 April 2012 Weight / Surface mass: ISO 23997 December 2007 Curving 6 hours at 80°C: NF EN ISO 23999 August 2018 Curving 72 hours at 80°C: NF EN ISO 23999 August 2018 Monitoring of curvature 1 month at 23°: NF EN ISO 23999 August 2018 Residual static punching (Building): ISO 24343-1 June 2007 Acoustic attenuation: NF EN ISO 717-2 May 2013 and NF EN ISO 10140-3 July 2021 Walking sound level less than 65 according to NF EN 16205 August 2013 / NF EN 16205 / IN1 May 2018 / NF S 31 -074.

[0079] It is clear from the above that the invention provides a multi-layer structure (1) for producing a floor covering, which is balanced and stable and which has satisfactory acoustic insulation performance when glued down, while reducing the environmental impact.

Claims

Claims 1. Multi-layer structure (1) for producing a floor covering, the multi-layer structure (1) is devoid of coupling means and successively comprises: - an upper PVC wear layer (2) comprising 20 to 70 PCR of plasticizer, and having a thickness of between 0.2 and 2 mm, preferably between 0.4 and 1 mm; - a first reinforcement frame (3); - a bonding layer (4) made of plasticized PVC allowing the reinforcement frame (3) to be bonded to a backing layer (5); - said backing layer (5), which is made of compact PVC and comprises 40 to 60 PCR of plasticizer, and a loading rate greater than 130 PCR, or even greater than 150 PCR, or even greater than 200 PCR and up to 250 PCR; - a foamed underlayer (6) made of plasticized and loaded PVC; characterized in that the backing layer (5) has a thickness of between 0.4 and 2 mm, and in that the bonding layer (4) comprises from 20 to 70 PCR of plasticizer and a loading rate of less than 5% by weight of the bonding layer (4) and has a thickness of between 0.05 and 0.5 mm.

2. Multilayer structure (1) according to claim 1, characterized in that the upper wear layer (2) is transparent, comprises 30 to 50 PCR of plasticizer, and a filler rate of less than 5% by weight of the upper layer (2), and in that the multilayer structure (1) comprises a decorative layer (7) positioned under the upper wear layer (2).

3. Multilayer structure (1) according to claim 2, characterized in that the decorative layer (7) is a layer of ink printed on a lower face of the upper wear layer (2), or on an upper coated face of the first reinforcing frame (3), or on an upper face of a decorative film positioned under the upper wear layer (2).

4. Multilayer structure (1) according to claim 1, characterized in that the upper wear layer (2) is a layer of pressed granules.

5. Multilayer structure (1) according to one of the preceding claims, characterized in that it comprises a second reinforcing frame (10) in the form of a glass veil, a glass grid, or a complex glass grid and glass veil.

6. Multilayer structure (1) according to one of the preceding claims, characterized in that it comprises a second reinforcing frame (10), embedded in the surface of the backing layer (5), and bonded to a lower face of the first reinforcing frame by the bonding layer.

7. Multilayer structure (1) according to one of claims 1 to 5, characterized in that it comprises a second reinforcing frame (10), embedded on the reverse face of the reverse layer (5), on the surface of the underlayer.

8. Multilayer structure (1) according to one of the preceding claims, characterized in that the sub-layer (6) has a thickness of between 1 and 3 mm.

9. Multilayer structure (1) according to one of the preceding claims, characterized in that the bonding layer (4) is a layer of plastisol, such as a PVC plastisol.

10. Multilayer structure (1) according to one of the preceding claims, characterized in that the backing layer (5) has a thickness of between 0.6 mm and 1.5 mm.

11. Multilayer structure (1) according to one of the preceding claims, characterized in that the first and / or the second reinforcing frame (9) is a glass veil, a glass grid, or a glass grid and glass veil complex, i

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