• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The invention relates to a multilayer panel for producing a floor covering having acoustic insulation properties, at least one of which is made of PVC, said panel comprising male-female connecting means or assembling a plurality of panels together, said panel comprising at least one decorative layer bonded to a backing layer, the latter being bonded to a non-woven textile sub-layer, intended to be in contact with the soil having a thickness of between 0.5 mm and 3 mm.
    公开号:FR3063503A1
    申请号:FR1751767
    申请日:2017-03-06
    公开日:2018-09-07
    发明作者:Fabien CARPENTIER；Xavier CRIONAY
    申请人:Gerflor SA；
    IPC主号:
    专利说明:

    (57) The invention relates to a multilayer panel for producing a floor covering having sound insulation properties, at least one of the layers of which is made from PVC, said panel comprising male-female means. connecting or assembling several panels together, said panel comprising at least one decorative layer linked to a backing layer, this being linked to a non-woven textile underlay, intended to be in contact with the ground having a thickness of between 0.5 mm and 3 mm.
    -1 ACOUSTIC PANEL FOR THE PRODUCTION OF A COATING
    OF SOIL
    Technical area
    The present invention relates to the technical sector of floor coverings and more particularly to a floor panel for the production of a floor covering or the like. The panel according to the invention has a slab or blade shape, is made of a plastic material such as PVC and has good acoustic properties. The present invention also relates to a method of producing an acoustic panel for producing a floor covering.
    Prior art
    It is well known to produce floor coverings from modular elements in the form of boards or slabs. Their fixing is usually carried out by an interlocking assembly of the blades or slabs having male-female means of connection or assembly. Their installation is said to be free because they are generally placed without adhesives on the floor, although in certain applications this can be envisaged. Such male-female means for connecting or assembling panels are notably described in documents GB 2 256 023, EP 1 026 341, WO 2012/004701 or also WO 2016/030627.
    Floor coverings made from PVC, in the form of boards or slabs comprising such male-female means of connection or assembly, also called LVT for "Luxury Vinyl Tile", are particularly advantageous because they make it possible to obtain a very wide range of decorations, in particular very realistic parquet imitation decorations, and remain easier to install and clean while retaining very good punching and rolling resistance properties.
    However, this type of coating has poor performance in terms of sound insulation, the reduction of noise pollution being a major expectation of consumers.
    -2To remedy this drawback, a solution to improve the sound insulation of an LVT floor covering consists of laying an insulating underlay beforehand and laying it over the panels to be assembled. This method is however tedious because it increases the number of necessary cuts and complicates the installation. Most of these underlayments must also be bonded to the floor before installing the panels to be assembled so as not to slip on the floor during installation.
    Another solution is to integrate a foam underlay into the slabs or boards. US patent 8,893,850 B2 proposes in particular the use of polyurethane foam and rubber as a material constituting an underlay of a floor panel. However, the foam used tends to weaken the resistance of the male-female connection means over time. Foams also crush over time and lose their ability to return to their shape, which causes positioning shifts between several adjoining boards and loss of sound insulation properties. On the other hand, this type of underlay degrades the punching and rolling resistance results of the installed floor coverings.
    Expose the invention
    One of the aims of the invention is therefore to propose a floor panel for producing a floor covering or the like comprising male-female means of connection or assembly and having good performance in terms of insulation. acoustics while maintaining good resistance of the male-female connecting means or assemblies and good resistance to punching and rolling over time.
    One of the objectives of the invention is in particular to propose a floor panel for the production of a floor covering having good performance in acoustic insulation, in particular attenuation of impact noises, according to standard EN ISO 10140-3 .
    Another objective is also to provide an effective floor panel for attenuating impact noises inside the room where they are created. This measure is
    - 3 done at the same time as the sound insulation measurement using a microphone measuring the noise level in the room according to standard NF EN 16205 August 2013, defining the laboratory measurements of impact noise in a room by the coatings of floor laid in this room.
    Another objective is to provide a floor panel resistant to a passage of at least 25,000 cycles from a double-band wheelchair as defined in standard ISO 4918 or NF EN 425.
    Another objective is to propose a floor panel classified P3 according to the UPEC classification, in particular having a punching value less than or equal to 0.20mm, preferably less than or equal 0.15mm between two measurements of residual static punching value carried out according to NF EN 433 standard.
    Another objective is to provide a floor panel resistant to traffic while retaining good sound insulation properties over time.
    To this end, a multilayer panel is proposed for producing a floor covering having acoustic insulation properties, at least one of the layers of which is made from PVC, said panel comprising female female means of connection. or of assembling several panels together, said panel comprising at least one decorative layer linked to a reverse layer, the reverse layer being linked to a non-woven textile sublayer, intended to be in contact with the ground, and having a thickness of between 0.5 mm and 3 mm.
    The advantage of such an underlay is to provide the panel according to the invention with good sound insulation performance, while allowing the female assembly means to withstand traffic well. A thickness of between 0.5 mm and 3 mm indeed makes it possible to guarantee a good compromise between the performance of sound insulation, and the resistance of male-female assembly means to traffic, and this for most machining profiles. of these assembly means. It may indeed be that male-female assemblies used in combination with a non-woven fabric with a thickness greater than 3 mm disassemble or break under the effect of traffic, the thickness of the non-woven fabric making it panel too flexible and increasing
    -4constraints on the means of assembly. On the other hand, a thickness of non-woven fabric less than 0.5 mm can limit the sound insulation provided by the panel.
    The non-woven textiles which can be used according to the invention are in particular non-woven textiles obtained according to all known routes: dry, wet, airlaid or melted, advantageously linked by a mechanical bonding (needling, water jet, ... ) chemical (latex) or thermal (calendering, passage under hot air, etc.) in order to improve the resistance of the fibers therebetween and to maintain good acoustic and mechanical properties over time.
    Advantageously, the non-woven textile sublayer has a thickness of between 1 mm and 2.5 mm. This thickness range makes it possible to achieve a better compromise between the performance of sound insulation and resistance of assembly means to traffic, in particular an acoustic attenuation according to ISO standard 101403 greater than 15 dB and a punching value less than or equal to 0.15mm.
    Preferably, the non-woven textile sublayer comprises a compressive strength greater than or equal to OKOK. Compressive strength is an important property of the underlay, which is crucial for maintaining good sound insulation over time provided by the underlay while contributing to the resistance of the assembly means to traffic. The compressive strength is measured according to standard CEN / TS 16354: 2012 which in turn refers to standard NF EN 826 of May 2013.
    More preferably, the non-woven textile sublayer comprises a compressive strength greater than or equal to 400KPa. This achieves a better result both for the preservation of the sound insulation performance over time and the resistance of the assembly means to traffic. It is in fact observed that a compressive strength greater than or equal to 400KPa allows the underlay to retain its thickness despite repeated traffic of heavy loads and created less stress in terms of assembly means. It is for example observed that the assembly means having a so-called “vertical” assembly direction, ie perpendicular to the plane of the ground covered by the floor covering panel, present less risk of unclipping if they are used in combination with a undercoat
    - 5 of nonwoven fabric comprising a compressive strength greater than or equal to 400KPa.
    Advantageously, the non-woven textile sublayer comprises natural fibers such as cellulose fibers, cotton fibers, linen fibers, synthetic fibers, in particular polyester fibers, polyamide fibers, polyethylene terephthalate fibers, aramid fibers, Nomex, ethylene polynaphthalate, polypropylene or even synthetic mineral fibers such as glass fibers or basalt fibers.
    Advantageously, the nonwoven fabric is produced from a mixture of natural fibers and synthetic fibers and / or synthetic mineral fibers. Without limitation, the non-woven textile underlay has a surface mass greater than 100 g / m 2 .
    The panels according to the invention and in particular the backing layer are rigid enough so that male-female assembly means can be machined, formed by injection molding or cut on their edges and that their assembly allows the panels to be locked together. under normal conditions of use, this blocking preventing the panels from being disassembled in at least one direction. Preferably, the panel according to the invention, and more particularly the backing layer of the panel, exhibits a bending stiffness greater than the maximum bending stiffness making it possible to satisfy International Standard ISO 24344: 2008. That is to say that a panel or the backing layer of a panel according to the invention subjected to this test would exhibit breaks, cracks, cracks and other permanent defects. It is indeed important, in particular to facilitate the installation of the panels according to the invention, that they are non-flexible. The term non-flexible means in particular that the panel according to the invention does not deform significantly under its own weight when it is held by a user on board. The term non-flexible is notably defined by a method described for example in ISO DIS 10581: 2011 or in standard ISO 24344: 2008. In this method, flexibility is defined by the ability of a panel or layer of flooring to be wrapped around a 20mm core, without cracks or cracks forming. It is also important that the stiffness in bending of the panel and in particular of the backing layer is sufficiently great for means of males-females assembly
    -6 can be machined there and that these can be assembled. The bending stiffness depends on each of the layers of the panel according to the invention, the skilled person being able to define the different compositions and thicknesses of the layers to achieve the expected rigidity.
    The invention also relates to a method for manufacturing a multilayer panel comprising male-female means for connecting or assembling several panels together for the production of a floor covering having acoustic insulation properties, this method comprising at least stages which consist of:
    - Bonding together, and in this order, at least one decorative layer (2), a backing layer (3) and a sublayer (4) of nonwoven fabric, said textile sublayer (4) being intended to be in contact with the ground and has a thickness of between 0.5 mm and 3 mm, and at least one of the layers is produced from PVC;
    - machine the male-female means of connection or assembly at the edges of the panel making it possible to assemble several panels together.
    Advantageously, the textile underlayer used in the process according to the invention has a compressive strength greater than or equal to OKOK, preferably greater than or equal to 400Kpa.
    Advantageously, the textile sublayer used in the method according to the invention has a surface mass greater than 100 g / m 2 .
    Advantageously, the textile sublayer is bonded to the reverse layer by calendering, cold bonding, hot bonding, extrusion of the reverse layer on the underlay, or by dusting with hot-melt adhesive.
    Advantageously, the method according to the invention comprises a step consisting in calendering the textile underlayer so as to homogenize its thickness, before binding said textile underlayer to the backing layer. Since non-woven textiles can have a very variable thickness on their surface, this additional step allows
    -7 compress them slightly in order to homogenize their thickness and guarantee the same mechanical behavior over the entire surface.
    The fillers that can be used are in particular inorganic fillers, for example clays, silica, kaolin, talc, calcium carbonate.
    Liquid plasticizers which can be used are in particular plasticizers such as Diisononyl Phthalate (DINP), Diisodecyl Phthalate (DIDP), 2-Ethylhexyl Diphenyl Phosphate (DPO), Dioctyl Terephthalate (DOTP), 1,2-cyclohexane dicarboxylic diisononyl ester acid (DINCH), plasticizers of the benzoate family, plasticizers of the adipate family, plasticizers sold under the brand PEVALEN® by Perstorp, epoxidized soybean oil (HSE), plasticizers totally or partially biobased, such as, for example, the plasticizers from the polysorb® ID 37 range sold by Roquette Pharma, the plasticizers from the citrofol range sold by Jungbunzlauer International AG, or the plasticizers from the soft-n-safe range sold by the Danisco company.
    The panels according to the invention are in the form of strips or slabs, each panel comprising an upper face intended to be in contact with the user, a lower face intended to be in contact with the ground and four edges. The edges of the panels according to the invention are machined to present male-female assembly means making it possible to connect several panels together. By male-female assembly means means in particular means comprising a groove machined on one of the edges of a panel and configured to be assembled with a tab machined on the opposite edge of a neighboring panel. Generally, the male-female assembly means comprise a first machining profile machined on one edge of a panel and configured to be assembled with a second machining profile machined on an opposite edge of a neighboring panel. . The panels thus obtained generally have two pairs of machining profiles, each pair comprising a first and a second machining profile on two opposite edges of a panel. The first and second machining profiles of each pair are not necessarily similar, in particular depending on the length of the edge considered and the desired direction of assembly. The assembly of the panels can in particular be carried out in a direction perpendicular to the ground in the case of
    - 8 so-called “vertical” assembly means, in a direction parallel to the ground in the case of so-called “horizontal” assembly means, or in more complex directions, for example by rotation and / or translation of a means of male assembly in a female assembly means. Such assembly means are notably described in the documents GB 2 256 023, EP 1 026 341, WO 2012/004701 or also WO 2016/030627. Preferably, the assembly means once assembled block the movement of two panels both in a vertical direction, that is to say perpendicular to the ground, and in a direction which is perpendicular to the edge of the panel on which the means assembly considered is machined and parallel to the plane formed by the ground. The assembly means and their machining profiles can in particular be obtained by in-line machining, by injection molding of the panel or by cutting, in particular with a cookie cutter.
    The panels according to the invention have a thickness generally between 3mm and 10mm, preferably between 4mm and 6mm. This thickness is measured between the upper face intended to be in contact with the user and the lower face intended to be in contact with the ground. The panels according to the invention have a width between 8 cm and 60 cm, preferably between 15 cm and 25 cm and a length between 80 cm and 240 cm, preferably between 100 and 150 cm.
    The sublayer produced from a nonwoven fabric can in particular be bonded to the reverse layer by cold or hot gluing, by dusting with glue as defined in patent EP 1570 920 B1 of the applicant, in particular by powdering polyester glue, copolyester or EVA (ethylene vinyl acetate), by using a double-sided adhesive or by heat sealing.
    Without limitation, the panels according to the invention may be grained and / or covered with a surface varnish, in particular in order to facilitate their maintenance and to protect them from wear.
    Brief description of the figures
    Other advantages and characteristics will emerge more clearly from the description which follows, given by way of nonlimiting example, with reference to the appended figures in which:
    - Figure 1 schematically illustrates a sectional view of a floor covering according to the invention;
    Detailed Description of the Invention
    Referring to Figure 1, the floor covering (1) according to the invention comprises:
    - a decorative layer (2);
    - a back layer (3)
    - an underlay made of a non-woven fabric (4).
    The decorative layer (2) is for example made up of a transparent wear layer, for example made from unloaded plasticized PVC (2a) and a decorative film (2b). The decorative layer (2) can also be obtained from granules produced from PVC and then pressed or by coating with plastisol, by extrusion in a flat die or by calendering.
    The backing layer (3) consists for example of a first layer made from PVC (3a) intended to be bonded to the decor layer (2), of a second layer (3c) intended to be bonded to the sub-layer (4) and a reinforcing reinforcement (3b) linked between the first layer (3a) and the second layer (3c). The layers (3a) and (3c) are for example obtained from plasticized PVC, loaded and formed by calendering. The backing layer (3) can also be obtained from granules produced from PVC and then pressed or by coating with plastisol, by extrusion in a flat die. The production of this layer by calendering nevertheless remains its preferred method of manufacture in terms of cost and mechanical performance obtained. The reinforcing frame is obtained in particular from a glass veil, a glass grid or a complex comprising a linked veil and a glass grid.
    Example 1
    In order to carry out acoustic and mechanical tests, LVT blades are prepared.
    These blades consist of:
    - Two layers of backing (3a, 3c) based on plasticized PVC comprising filler. The layer (3a) also comprising glass fiber particles to provide good dimensional stability to the blade.
    - A printed decorative film (2b) in PVC.
    - A transparent wear layer in unloaded plasticized PVC (2a) which protects the printed PVC film.
    Polyurethane treatment on the surface of the transparent wear layer (not shown).
    The compositions and characteristics of the layers (2a, 3a, 3c) and printed film (2b) correspond to the product marketed under the type name Creation 55 Insight Clic System by the applicant The first layer (3a) comprises approximately 33% of PVC, 10% plasticizers (DINP), 4% additives (process aids, stabilizers, pigments), 3% PVC particles mixed with glass fibers and 50% fillers. The second layer (3b) contains around 33% PVC, 10% plasticizers (DINP), 4% additives (process aids, stabilizers, pigments) and 55% fillers.
    Generally, a backing layer (3) according to the invention can be obtained with a composition comprising approximately 30% of PVC, approximately 10% of plasticizers, approximately 5% of additives (process aids, stabilizers, pigments) and about 55% of charges.
    Male-female means of connection or assembly making it possible to assemble several panels are machined in the back layers (3a, 3c). These means make it possible to assemble the blades in a direction perpendicular to the ground and are described in patent application WO 2016/030627 by the applicant.
    In order to assess the acoustic interest of the panels according to the invention, a non-woven textile underlayer (4) is laminated on the reverse side of the second layer (3c). Laminating is carried out using a double-sided adhesive film. Other complexing methods are possible such as pre-sizing of the nonwoven by dusting a hot-melt adhesive, bonding with an acrylic adhesive or bonding with a hot-melt adhesive.
    - He
    Three different sublayers, the characteristics of which are detailed in the table below, are linked to the reverse layers (3c) of different panels thus formed. The SC-01 and SC-02 sublayers are produced in nonwoven textiles according to the invention, the SC-03 sublayer is a polyolefin foam used as a reference.
    No.under-layer Thickness Type Material surface mass Compressive strength (CEN / TS 16354: 2012) SC-01 1mm Non woven needle punched calendered, thermofixed andthermolié Polyester fibers. 200 g / m 2 of fibers Coated with 20 g / m 2 of CoPolyester powder 220 g / m 2 > 100KPa SC-02 0.93mm Needlewoven Non Woven Polyester fibers 227 g / m 2 400KPa +/- 10% SC-03(reference) 1.5mm foam Closed cell, physically crosslinked polyolefin foam, laminated with a polyolefin sheet 344 g / m 2 > 400KPa
    The panels according to the invention thus obtained are first subjected to a first impact machine test in order to know the value of the attenuation of the impact noise of the product before traffic, that is to say before wear. The panels then pass to the chair test on casters fixed by standard NF EN 425 (or ISO 4918) to observe breakage or delamination phenomena between the layers. The objective here is to observe the behavior of the sound insulation properties as a function of the number of cycles of the chair on casters endured. The wheelchair test is pushed to 35,000 cycles if there is still no deterioration.
    After switching to the wheelchair, a second acoustic test is carried out to check the behavior of the acoustic properties after traffic, after wear. For this, the panels must not have been damaged (no breakage of the means of male-female assemblies or delaminations between the different layers of the blade). An acoustic test is carried out on the panels from 15,000 cycles of chair on casters, then after 20,000 cycles, 25,000 cycles and 30,000 cycles.
    A punching test is also carried out on a blade sample according to the invention not exposed to traffic on a wheelchair.
    No.under-layer Acoustic insulation at 0 cycles (dB) - EN ISO10140-3 Walking sound # 1 (dB) -NFEN16205 Insulationacousticat15000 cycles (dB) EN ISO10140-3 Sound towalking# 2 (dB) - NFEN 16205 Acoustic insulation at 20,000 cycles (dB) EN ISO10140-3 Acoustic insulation 25,000 cycles (dB) EN ISO10140-3 > 35,000cycles Punching (mm) SC-01 18 71 dB 17 71 dB 17 NC breaksmeansassemblyage 0.13 SC-02 15 72 dB 14 74 dB 14 breaksmeansassemblye 0.13 SC-03 16 69 dB 15 72 dB breaksmeansassemblye 0.2
    This table makes it possible to show that the SC-01 and SC-02 sub-layers according to the invention retain good acoustic insulation and sound performance when walking, even after more than 20,000 cycles or even 25,000 cycles from chair to caster, while preserving the strength of the assembly means of the panels. The compressive strength of non-woven textile underlayers is also an important factor, a compressive strength greater than 10OKpa, advantageously greater than 400Kpa makes it possible to improve the resistance of the joining means over time and to preserve good sound insulation and walking sound performance. Tests on a chair on casters show that the panels according to the invention also have good results and provide better resistance of the assembly means over time, in particular in comparison with a foam underlay. The values of the punching tests are also comparable with equivalent panels without an undercoat and significantly better than the results of a panel on a foam undercoat.
    权利要求:
    Claims (13)
    [1" id="c-fr-0001]
    1. Multilayer panel for producing a floor covering having sound insulation properties, at least one of the layers of which is made from PVC, said panel comprising male-female means of connection or assembly of several panels together, said panel comprising at least one decorative layer (2) linked to a backing layer (3) characterized in that the backing layer (3) is linked to a sub-layer (4) of non-woven fabric, intended to be in contact with the ground, and having a thickness of between 0.5 mm and 3 mm.
    [2" id="c-fr-0002]
    2. Panel according to claim 1, characterized in that the sub-layer (4) of nonwoven fabric has a thickness between 1 mm and 2.5 mm.
    [3" id="c-fr-0003]
    3. Panel according to claim 1, characterized in that the sub-layer (4) of nonwoven fabric comprises a compressive strength which is greater than or equal to lOOKPa.
    [4" id="c-fr-0004]
    4. Panel according to claim 3, characterized in that the sub-layer (4) of nonwoven fabric comprises a compressive strength which is greater than or equal to 400KPa.
    [5" id="c-fr-0005]
    5. Panel according to claim 1, characterized in that the sublayer (4) of nonwoven fabric comprises natural, synthetic or mineral synthetic fibers.
    [6" id="c-fr-0006]
    6. Panel according to claim 5, characterized in that the sub-layer (4) of nonwoven fabric comprises polyester fibers or polypropylene fibers.
    [7" id="c-fr-0007]
    7. Panel according to claim 1, characterized in that it has a bending stiffness greater than the maximum bending stiffness to meet the International Standard ISO 24344: 2008.
    [8" id="c-fr-0008]
    8. Panel according to claim 1, characterized in that the sub-layer (4) of nonwoven fabric has a surface mass greater than 100 g / m 2 .
    [9" id="c-fr-0009]
    9. A method of manufacturing a multilayer panel comprising male-female means for connecting or assembling several panels together for the production of a floor covering having acoustic insulation properties, characterized in that th comprises at least steps consisting in:
    - Bonding together, and in this order, at least one decorative layer (2), a backing layer (3) and a sublayer (4) of nonwoven fabric, said textile sublayer (4) being intended to be in contact with the ground and has a thickness of between 0.5 mm and 3 mm, and at least one of the layers is produced from PVC;
    - machine the male-female means of connection or assembly at the edges of the panel making it possible to assemble several panels together.
    [10" id="c-fr-0010]
    10. Method according to claim 9, characterized in that the textile underlay (4) comprises a compressive strength which is greater than or equal to lOOKPa.
    [11" id="c-fr-0011]
    11. Method according to claim 9, characterized in that the textile underlay (4) comprises a compressive strength which is greater than or equal to 400KPa.
    [12" id="c-fr-0012]
    12. Method according to claim 9, characterized in that the textile sublayer (4) is bonded to the backing layer (3) by calendering, cold bonding, hot bonding or by dusting with hot-melt adhesive.
    [13" id="c-fr-0013]
    13. Method according to claim 9, characterized in that it comprises a step consisting in calendering the textile underlay (4) so as to homogenize its thickness, before bonding said textile underlay (4) to the back layer (3).
    1/1
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    FR3091831B1|2019-01-22|2020-12-25|Gerflor|Multilayer structure for making a floor covering, and method of manufacturing such a multilayer structure|
    RU201214U1|2019-09-16|2020-12-03|Таркетт Гдл С.А.|HETEROGENEOUS SURFACE COATING, IN PARTICULAR PRESTIGIOUS VINYL TILES, MADE ON THE LUBRICANT COATING LINE BASED ON THERMOPLASTIC MATERIAL|
    UA146830U|2019-09-16|2021-03-24|Таркетт Гдл С.А.|HETEROGENEOUS SURFACE COATING, ESPECIALLY PRESTIGIOUS VINYL TILE, MANUFACTURED ON A LINE FOR THE PRODUCTION OF A COATED COATING ON THE BASIS OF THERMOPLAST|
    法律状态:
    2018-03-29| PLFP| Fee payment|Year of fee payment: 2 |
    2018-09-07| PLSC| Publication of the preliminary search report|Effective date: 20180907 |
    2020-03-31| PLFP| Fee payment|Year of fee payment: 4 |
    2021-03-30| PLFP| Fee payment|Year of fee payment: 5 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1751767A|FR3063503B1|2017-03-06|2017-03-06|ACOUSTIC PANEL FOR REALIZING A FLOOR COVER|
    FR1751767|2017-03-06|FR1751767A| FR3063503B1|2017-03-06|2017-03-06|ACOUSTIC PANEL FOR REALIZING A FLOOR COVER|
    CN201880015786.0A| CN110546337B|2017-03-06|2018-03-05|Acoustic panel for producing floor coverings|
    PCT/FR2018/050493| WO2018162828A1|2017-03-06|2018-03-05|Acoustic panelling for producing a floor covering|
    EP18713310.3A| EP3571361A1|2017-03-06|2018-03-05|Acoustic panelling for producing a floor covering|
    US16/491,169| US20200032526A1|2017-03-06|2018-03-05|Acoustic panelling for producing a floor covering|
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