Artificial stone plate and manufacturing method thereof

Abstract

A method of manufacturing an artificial stone slab, comprising: casting a first layer (10) formed from a first material; depositing a veining pattern (30) formed of a second material in a groove pattern (40) defined on and / or within the first layer (10); depositing a second layer (20) of a third material covering the first layer (10) and the veining pattern (30), applying vacuum and vibration to the material and solidifying the material, obtaining an artificial stone slab; wherein the third material has a lower flowability and / or a higher density than the second material, the vibration causing the second material to float through the second layer (20); or the first material has a higher flowability and / or a lower density than the second material, the vibration causing the second material to sink through the first layer (10).

Description

Technical Field

[0001] The present invention relates to a method for manufacturing artificial stone slabs using different curable fluid mixtures containing granular particles, which can provide artificial stone slabs with a vein pattern having a more natural appearance, and to artificial stone slabs obtained by said method. Background Art

[0002] Artificial stone slabs manufactured using different curable fluid mixtures are known. According to the known method, different curable fluid mixtures are poured into a mold and cured after vibration and pressing, thereby obtaining a hardened artificial stone slab.

[0003] For example, Patent Documents US4698010A and EP0970790B1 describe a method for manufacturing artificial stone slabs by mixing a polymerizable curable resin with granular particles and curing the particle mass after vibration, pressure, and vacuum curing, thereby being able to eliminate any air bubbles inside the mixture.

[0004] According to Patent Document WO2014108582, a product similar to the above is also known, but it is formed by a mixture of two different - colored particle masses and combined into layers, such that the product looks like having coarser veins. However, this document does not describe in detail the specific method of combining these two mixtures and forming the layers, and it seems to be obtained only by alternately stacking the two mixtures in layers. The system cannot define the precise orientation or geometry of the veins.

[0005] A technique for manufacturing so - called cement mosaic tiles (or hydraulic floor tiles) is also known, the process of which is to place inserts in a mold for defining a plurality of compartments separated by thin walls. Different - colored fluid mixtures (usually mixtures composed of cement, water, and colorants) are poured into each compartment, then the inserts are removed, the mold is filled with cement and pressed, resulting in a hard plate having a visible surface and showing a pattern of precisely predefined different - colored areas.

[0006] Document FR353105 describes a method for manufacturing a gypsum board containing veins, wherein a groove is formed on it by manually moving a tube through the shaped gypsum before the gypsum hardens, and a curable fluid is conveyed through the tube to fill the groove, thereby forming the veins.

[0007] Document FR2117007 discloses a process for producing slates with veins or tiles with patterns, which includes filling a mold with a layer of colored or colorless slurry (such as chip cement); and using raised elements attached to a common support to imprint the slurry, the shape of the raised elements matching the desired pattern; the imprinting includes one or more colored materials, vibrating the whole slurry, and then filling the mold with a second layer of slurry (such as concrete) and pressing the resulting whole.

[0008] The above method for forming a veined pattern produces a precise and well-defined veined pattern, that is, there is a sharp boundary between the material used for the veins and the material used for the rest of the artificial slate, resulting in an unnatural appearance and increasing the risk of penetration or fracture between the materials of the artificial slate.

[0009] Therefore, a method is needed to obtain a more natural appearance and improve the bonding between the constituent materials of the artificial slate.

[0010] The present invention provides a solution to the above and other problems. Summary of the Invention

[0011] The present invention relates to a method for manufacturing an artificial slate, as described in claim 1, and an artificial slate obtained by this method, as described in claim 8.

[0012] The method for manufacturing an artificial slate includes:

[0013] Pouring a first layer formed from a curable fluid mixture of a first material;

[0014] Depositing a veined pattern formed from a curable fluid mixture of a second material on the upper surface of the first layer and / or within a groove pattern defined by the upper surface of the first layer;

[0015] Applying a vacuum and vibration to the curable fluid mixture, and optionally applying compression, to cure the curable fluid mixture and make it harden, thereby obtaining an artificial slate.

[0016] The curable fluid mixture described herein refers to a mixture containing a polymeric resin, additives, and optionally particulate grains with different particle size distributions. When in a fluid state, this mixture can be poured into a mold to be shaped into an artificial slate, and subsequently can be cured to form a solid with the above shape.

[0017] For example, the materials forming the fluid mixture of the artificial stone slab can be selected from the following options: the resin is selected from unsaturated polyester resin, methacrylate resin, epoxy resin, and vinyl resin; the granular particles with different particle size distributions are selected from stone particles such as marble, dolomite, opaque quartz, crystal quartz, graphite, ferrosilicon, basalt, feldspar, granite, natrolite, silica, or other granular particles such as glass, metal particles, and plastic particles; the additives are selected from colorants, adhesives, accelerators, and catalysts.

[0018] According to the above description, the first material is poured, preferably in a plate-shaped mold, to form a first layer, usually a first layer with a uniform thickness, whose main surfaces are the lower surface facing the bottom of the mold and the upper surface that is exposed and parallel to the bottom surface.

[0019] Then, the second material is deposited to form a vein pattern on the exposed upper surface of the first layer, or within the groove pattern defined in the first layer.

[0020] The vein pattern is composed of a fine vein pattern (thickness less than 5 mm) and / or a thick vein pattern (thickness equal to or greater than 5 mm). The veins can be branched, faithfully reproducing the appearance of the branched vein pattern of natural stones such as natural marble, and even being able to reproduce any type of geometric shape or pattern.

[0021] The second material is deposited according to a predefined vein pattern. The precise deposition of the second material can be achieved, for example, by covering the exposed upper surface of the first layer with a cover plate provided with openings corresponding to the vein pattern, and then pouring the second material through the openings to form a pattern on the veins.

[0022] According to another example, the precise deposition of the second material can be achieved by a spray nozzle connected to a robotic support, and the robotic support is configured to move the spray nozzle precisely above the first layer and spray the second material through the spray nozzle according to the layout of the vein pattern.

[0023] The second material can simply be deposited on the upper surface (i.e., the flat surface) of the first layer, or can be deposited within the grooves defined in the first layer, and the groove pattern is the same as the vein pattern.

[0024] The grooves can be engraved, for example, by imprinting a set of protrusions on the exposed upper surface of the first layer, and the array of protrusions is complementary to the groove pattern to be engraved.

[0025] Insert the array of protrusions into the exposed upper surface of the first layer and then remove them, leaving the groove pattern on the exposed upper surface.

[0026] The array of protrusions can be placed on a flat plate, for example, or arranged on a roller, and the pattern is gradually inserted into the first layer by rolling on the exposed upper surface.

[0027] Optionally, the engraving of the first layer further includes forming a ramp towards the groove in a first layer area near the groove. In this case, the second material can be poured in a fluid state in the first layer area near the groove, or can be poured evenly in a fluid state over the entire first layer, and the second material will flow along the ramp towards the groove to fill the groove pattern without the need for precise deposition devices. The second material should be precisely metered to fill the groove pattern.

[0028] There are many other ways to obtain grooves. For example, by inserting a punch or a horizontally rotating engraved disc roller into a fluid mixture and then moving it to reproduce the desired vein pattern, or by following a pattern defined by a cam guide, or by an automated arm programmed to reproduce the pattern.

[0029] The method further includes, in a manner not disclosed in the prior art:

[0030] Before applying vacuum and vibration and before curing, depositing a second layer composed of a curable fluid mixture of a third material to cover the upper surface of the first layer and the vein pattern; wherein:

[0031] The third material has lower fluidity and / or higher density relative to the second material, the third material contains particulate particles and its color is different from that of the second material, and vibration causes the second material to float upward through the second layer, and the vein pattern appears on the upper surface of the second layer; or

[0032] The first material has higher fluidity and / or lower density relative to the second material, the first material contains particulate particles and its color is different from that of the second material, and vibration causes the second material to sink through the first layer, and the vein pattern is deposited on the lower surface of the first layer.

[0033] Accordingly, before applying vibration, the second material constituting the vein pattern is located between the first material and the third material of the first layer and the second layer.

[0034] It is well known that when two different fluid materials are mixed and vibrated, the material with higher fluidity tends to float to the surface, and the material with lower fluidity tends to sink to the bottom. This phenomenon is similar to soil liquefaction that occurs during an earthquake.

[0035] In addition, when two different fluid materials are mixed and vibrated, the material with lower density tends to float on top of the material with higher density, and the low-density material also floats upward to the surface of the higher-density material, while the higher-density material sinks to the bottom. This phenomenon is similar to the system for separating gold grains from other particulate particles by the panning method.

[0036] Due to the different fluidities and / or densities of the second material relative to the first or second material, when vibration is applied, the second material appears on the upper surface of the second layer, rises due to its higher fluidity and / or lower density relative to the third material, or appears on the lower surface of the first layer due to its lower fluidity and / or higher density relative to the first material.

[0037] During the process of the second material floating up to the surface of the second layer or sinking down to the lower surface of the first layer, the vein pattern becomes more irregular, especially at its edges, because the flow of the second material through the first material or the third material generates turbulence, thus forming an exposed vein pattern with a more natural appearance on the surface of the hardened artificial stone slab.

[0038] Especially during the process of the second material floating up or sinking down, the edges of the vein pattern become more blurred, resulting in a certain degree of mixing with the surrounding materials, which improves the overall strength of the slab and produces a slab with a more natural appearance.

[0039] According to a second aspect, the present invention also relates to an artificial stone slab obtained by the method described in the present application.

[0040] The proposed artificial stone slab comprises:

[0041] A first layer made of a first material for defining one main surface of the slab; or a second layer made of a third material for defining the other main surface of the slab;

[0042] A vein pattern contained within the first layer made of the first material and exposed on the main surface defined thereby, the first material comprising granular particles, or a vein pattern contained within the second layer made of the third material and exposed on the main surface defined thereby, the third material comprising granular particles, the vein pattern being made of a second material, the color of which is different from the color of the first material or the third material containing the vein pattern.

[0043] According to the above, the artificial stone slab may include a first layer containing a vein pattern and exposed on its main surface, or a second layer containing a vein pattern and exposed on its main surface.

[0044] According to the present invention, in addition to the first layer containing the vein pattern, the artificial stone slab further includes a second layer made of a third material, the second layer being superimposed on the first layer and attached to the surface opposite to the main surface where the exposed vein pattern is located.

[0045] Alternatively, in addition to the second layer containing the vein pattern, the artificial stone slab further includes a first layer made of a first material, the first layer being superimposed on the second layer and attached to the surface opposite to the main surface where the exposed vein pattern is located.

[0046] The vein edges of the vein pattern become increasingly uneven in the direction towards the main surface of the slab where the vein pattern is exposed, and the second material interlaces more with the surrounding first or second material in the direction where the edges face the main surface where the vein pattern is exposed.

[0047] Accordingly, the edges of the vein pattern are irregular throughout the entire thickness of the layer in which it is contained, but become increasingly uneven when approaching the main surface where the vein pattern is exposed, and the second material that constitutes the vein pattern interlaces more with the surrounding first or second material when approaching the main surface where the vein pattern is exposed. This is the result of the production method, and due to the unevenness and ambiguity of the vein pattern edges, the artificial slab has a more natural appearance.

[0048] It should be understood that the main surfaces of the first layer and the second layer correspond to the upper surface and the lower surface described above. Description of the Drawings

[0049] The above and other advantages and features will be more clearly understood from the following detailed description of embodiments in conjunction with the drawings, which should be regarded as exemplary and non - restrictive, wherein:

[0050] Figure 1 A perspective view of an artificial slab obtained according to the present invention is shown;

[0051] Figures 2A to 2F Shows the successive steps of the method proposed according to the first embodiment, in which an insert with protrusions for reproducing the vein pattern is inserted into the first layer ( Figure 2B ), and then removed, leaving a groove pattern ( Figure 2C ), and these grooves are then filled with a second material to form a vein pattern ( Figure 2D ), and then covered with a second layer ( Figure 2E ). After applying vibration, compression, and vacuum and after curing, the groove pattern migrates through the second layer, producing an artificial slab with a surface having a visible vein pattern ( Figure 2F );

[0052] Figures 3A to 3F Shows the same as Figures 2A to 2F , but according to another embodiment, in which each protrusion of the insert is defined by a pair of opposing walls, forming a space with an open bottom therebetween, shaped like a vein. The insert is introduced into the mold before pouring the first layer ( Figure 3A ), and the first layer is poured into the mold between the protrusions of the insert ( Figure 3B ), leaving the space empty, defining a groove pattern. Once the groove pattern is filled with the second material ( Figure 3C ), the insert is withdrawn ( Figure 3D ), and the second layer is poured ( Figure 3E );

[0053] Figures 4A to 4F shows the same content as Figures 2A to 2F , but according to another additional embodiment, where an insert is inserted into the mold, above the first layer ( Figure 4B ), the insert includes a groove pattern having a certain depth, and these grooves are filled with a second material to form a groove pattern above the first layer ( Figure 4C ). Subsequently, the insert is removed, leaving a vein pattern above the first layer ( Figure 4D ), and then a second layer is covered thereon ( Figure 4E ).

[0054] Figure 2F , Figure 3F and Figure 4F show artificial stone slabs obtained when the second material forming the vein pattern has a higher fluidity and / or lower density than the third material forming the second layer, and during the application of vibration, the vein pattern floats upward through the second layer.

[0055] If the second material forming the vein pattern has a lower fluidity and / or higher density than the first material forming the first layer, equivalent artificial stone slabs as shown in Figure 2F , Figure 3F and Figure 4F will be obtained by the same process steps, but the groove pattern is visible on the lower surface rather than the upper surface. Detailed Description of the Invention

[0056] According to a preferred embodiment, the present invention describes a method for manufacturing an artificial stone slab, which contains a vein pattern 40 with a natural appearance, for example, similar to marble or other metamorphic rocks.

[0057] Generally, artificial stone slabs are used as kitchen countertops, floor slabs or wall covering materials.

[0058] Generally, the total thickness of the artificial stone slab is between 1 cm and 3 cm, and the width is at least 60 cm, and the length is at least 120 cm.

[0059] The proposed method includes first pouring a first layer 10 formed of a curable fluid mixture of a first material in a mold, exposing the upper surface of the first layer 10.

[0060] Then, a vein pattern 30 formed of a curable fluid mixture of a second material is deposited on the exposed upper surface of the first layer 10.

[0061] Optionally, before depositing the second material, a groove pattern 40 is defined on the first layer 10, for example by temporarily introducing an insert 41 that reproduces the groove pattern 40 on the first layer and removing it to leave the groove pattern thereon, or by introducing the insert 41 into the mold before casting the first material. In this case, the second material will be deposited within the groove pattern 40, defining the vein pattern 30.

[0062] Once the second material is deposited, a second layer 20 composed of a curable fluid mixture of a third material is cast into the mold, covering the exposed upper surface of the first layer 10 and the vein pattern 30.

[0063] The curable fluid mixtures of the first, second, and third materials include a mixture of a polymeric resin in a fluid state with other components such as additives and particulate grains.

[0064] Then, a vacuum, vibration, and compression are applied to the uncured artificial stone slab including the curable fluid mixtures of the first, second, and third materials.

[0065] According to a first embodiment of the proposed invention, the third material has a lower fluidity and / or a higher density than the second material, and vibration causes the second material to float upward through the second layer 20, and the vein pattern 30 appears on the upper surface of the second layer 20. In this case, the color of the third material will be different from the color of the second material, thus allowing the second layer and the exposed vein pattern thereon to be visually distinguished.

[0066] In this case, the thickness of the second layer 20 is preferably less than 10 mm or less than 6 mm before vibration, located above the vein pattern 30 of the second material, facilitating the complete appearance of the vein pattern on the upper surface. The second layer 20 can also have the same or higher fluidity and / or the same or lower density as the first material to prevent the first material from floating upward through the second layer 20 during vibration.

[0067] According to another embodiment of the same invention, it is proposed that the first material has a higher fluidity and / or a lower density than the second material, and vibration causes the second material to sink through the first layer 10, and the vein pattern 30 is deposited on the lower surface of the first layer 10. In this case, the color of the first material will be different from the color of the second material, thus allowing the first layer and the exposed vein pattern thereunder to be visually distinguished.

[0068] In this case, the thickness of the first layer 10 is preferably less than 10 mm or less than 6 mm before vibration, located below the vein pattern 30 of the second material, facilitating the complete appearance of the vein pattern on the lower surface. The first layer 10 can also have the same or lower fluidity and / or the same or higher density as the third material to prevent the third material from sinking through the first layer 10 during vibration.

[0069] In either case, after vibration, the curable fluid mixture is cured to harden it, resulting in an artificial stone slab having a visually prominent natural-looking vein pattern on its upper surface according to the first embodiment or on its lower surface according to the second alternative embodiment described above.

[0070] According to another additional embodiment of the invention, when the fluidity of the third material is lower than and / or the density is higher than that of the second material, at least some of the grooves forming the groove pattern 40 can extend through the entire thickness of the first layer 10 to reach its lower surface. In this case, these veins will extend through the entire thickness of the slab, but the artificial stone slab will have a more natural appearance on its upper surface, where the vein pattern becomes visible after floating up through the second layer.

[0071] Optionally, the groove pattern 40 or the part of it that extends through the entire thickness of the first layer 10 can be defined by an insert 41 in the shape of a vein, which holds the first material outside the groove pattern 40 or outside the part of it occupied by the insert.

[0072] The insert 41 can be removed before depositing the second material onto the groove pattern, leaving the grooves forming the groove pattern open.

[0073] Alternatively, the insert can be an insert with an open bottom, which is introduced into the mold before pouring the first layer, so that the first material does not enter the groove pattern 40 during pouring. Then, the second material is poured inside the insert 41, and the insert 41 is subsequently removed before pouring the second layer 20.

[0074] According to another alternative embodiment, the grooves of the groove pattern 40 or parts of them are engraved on the upper surface of the first layer 10 before depositing the second material, for example using a programmable robotic engraving device, to engrave the groove pattern according to a predefined pattern corresponding to the vein pattern 30.

[0075] Preferably, the second material comprises granular particles, the particle size of which can be smaller than the granular particles of the first and / or third materials.

[0076] The invention also relates to an artificial stone slab obtained according to the above method.

[0077] The artificial stone slab comprises a first layer 10 made of a first material for defining one main surface of the slab, and a second layer made of a third material for defining the other main surface of the slab.

[0078] According to a first embodiment of the proposed artificial stone slab, the vein pattern 30 is contained within the first layer 10 made of the first material and is exposed on the main surface of the slab defined by it. In this case, the first material will comprise granular particles, preferably stone grains.

[0079] In this case, the thickness of the second layer 20 can be less than 10 mm or less than 6 mm, and / or its thickness can be included between 15% and 35% of the total thickness of the artificial stone slab.

[0080] According to another embodiment, the vein pattern 30 is included within the second layer 20 made of a third material and is exposed on the main surface of the slab delimited thereby. In this case, the third material will comprise granular particles, preferably stone grains.

[0081] In this case, the thickness of the first layer 10 can be less than 10 mm or less than 6 mm, and / or its thickness can be included between 15% and 35% of the total thickness of the artificial stone slab.

[0082] Regardless of whether the vein pattern 30 is included in the first layer or the second layer, the vein pattern 30 will be made of a second material, the color of which is different from the color of the first material or the third material that includes the vein pattern 30.

[0083] The vein edges of the vein pattern 30 are increasingly uneven in the direction towards the main surface of the slab on which the vein pattern 30 is exposed, and the second material and the surrounding first or third material are increasingly intertwined in the direction of the edge towards the main surface where the vein pattern 30 is exposed.

[0084] Accordingly, the maximum unevenness of the vein edges and the maximum mixing between the second material and the surrounding first or third material occur on the main surface of the slab where the vein pattern is exposed, and the unevenness and mixing gradually decrease within the thickness of the artificial stone slab.

[0085] This feature is due to the second material floating up through the second layer or sinking through the first layer. The edge unevenness and mixing degree of the veins gradually increase from the interface between the first layer and the second layer towards the main surface of the artificial stone slab, which is due to the interaction with the surrounding materials during the floating or sinking process.

[0086] Preferably, the second material comprises granular particles, such as stone grains, and these particles are preferably smaller than the granular particles of the first and / or third materials.

Claims

1. A method for manufacturing an artificial stone slab, comprising: Pouring a first layer (10) formed from a curable fluid mixture of a first material; Depositing a vein pattern (30) formed from a curable fluid mixture of a second material on the upper surface of the first layer (10) and / or within a groove pattern (40) defined on the first layer (10); Applying a vacuum and vibration to the curable fluid mixture and curing the curable fluid mixture to harden it, thereby obtaining the artificial stone slab; Characterized in that the method further comprises: Before applying the vacuum and vibration and before curing, depositing a second layer (20) formed from a curable fluid mixture of a third material to cover the upper surface of the first layer (10) and the vein pattern (30); wherein, The third material has lower fluidity and / or higher density relative to the second material, and the third material comprises particulate grains and has a color different from that of the second material, and the vibration causes the second material to float upward through the second layer (20), so that the vein pattern (30) appears on the upper surface of the second layer (20); Or The first material has higher fluidity and / or lower density relative to the second material, and the first material comprises particulate grains and has a color different from that of the second material, and the vibration causes the second material to sink through the first layer (10), so that the vein pattern (30) is deposited on the lower surface of the first layer (10).

2. The method according to claim 1, wherein: When the second layer (20) is made of a third material with lower fluidity and / or higher density relative to the second material, before vibration, the thickness of the second layer (20) above the vein pattern (30) of the second material is less than 10 mm or less than 6 mm; Or When the first layer (10) is made of a first material with higher fluidity and / or lower density relative to the second material, before vibration, the thickness of the first layer (10) below the vein pattern (30) of the second material is less than 10 mm or less than 6 mm.

3. The method according to claim 1 or 2, wherein: When the second layer (20) is made of a third material with lower fluidity and / or higher density relative to the second material, the fluidity of the second layer (20) is equal to or higher than and / or the density is equal to or lower than that of the first material, so as to prevent the first material from floating upward through the second layer (20); Or When the first layer (10) is made of a first material with higher fluidity and / or lower density relative to the second material, the fluidity of the first layer (10) is equal to or lower than and / or the density is equal to or higher than that of the third material, so as to prevent the third material from sinking through the first layer (10).

4. The method according to claim 1, 2 or 3, wherein When the third material has lower fluidity and / or higher density relative to the second material, at least some of the grooves constituting the groove pattern (40) extend through the entire thickness of the first layer (10) and reach its lower surface.

5. The method according to claim 4, wherein, The groove pattern (40) or its extension through a portion of the entire thickness of the first layer (10) is defined by an insert (41) in the shape of a vein for preventing the first material from entering the groove pattern (40) or its said portion, and the insert (41) is removed before depositing the second material. Alternatively, the insert (41) is an insert with an open bottom and is placed in a mold before pouring the first material to prevent the first material from entering the groove pattern. The second material is poured into the insert (41), and the insert (41) is removed before pouring the second layer (20).

6. The method according to any one of the preceding claims, wherein Before depositing the second material, the grooves of the groove pattern (40) or its portion are engraved on the upper surface of the first layer (10).

7. The method according to any one of the preceding claims, wherein, The second material includes granular particles.

8. The method according to claim 7, wherein The granular particles of the second material are smaller than the granular particles of the first material and / or the second material.

9. An artificial stone slab obtained by the method according to any one of the preceding claims, wherein, The artificial stone slab includes: A first layer (10) made of a first material, defining one main surface of the slab, or a second layer made of a third material, defining the other main surface of the slab; A vein pattern (30) included in the first layer (10) of the first material and exposed on the main surface of the slab defined thereby, the first material including granular particles, or included in the second layer (20) made of a third material and exposed on the main surface of the slab defined thereby, the third material including granular particles, and the vein pattern (30) is formed of a second material having a color different from the color of the first material or the third material including the vein pattern (30); Characterized in that the artificial stone slab further includes: A second layer (20) made of a third material, superimposed on the first layer (10) and attached to the surface opposite to the main surface on which the vein pattern (30) is exposed on the first layer (10); or, a first layer (10) made of a first material, superimposed on the second layer (20) and attached to the surface opposite to the main surface on which the vein pattern (30) is exposed on the second layer (20); and The vein edges of the vein pattern (30) become increasingly uneven in the direction towards the main surface of the slab on which the vein pattern (30) is exposed, and the second material and the first or third material surrounding it gradually intertwine in the direction towards the main surface on which the vein pattern (30) is exposed at the edge.

10. The artificial stone slab according to claim 9, wherein: The thickness of the second layer (20) exposing the vein pattern (30) on its main surface is less than 10 mm or less than 6 mm; or The thickness of the first layer (10) exposing the vein pattern (30) on its main surface is less than 10 mm or less than 6 mm.

11. The artificial stone slab according to claim 9 or 10, wherein: The thickness of the second layer (20) exposing the vein pattern (30) on its main surface is included between 15% and 35% of the total thickness of the artificial stone slab; The thickness of the first layer (10) exposing the vein pattern (30) on its main surface is included between 15% and 35% of the total thickness of the artificial stone slab.

12. The artificial stone slab according to any one of claims 9, 10 or 11, wherein The second material includes granular particles.

13. The artificial stone slab according to claim 12, wherein, The granular particles of the second material are smaller than the granular particles of the first material and / or the second material.

Images