Foamed vinyl board for composite floor, composite floor and paving method of composite floor

Abstract

The invention discloses a foaming vinyl board for a composite floor, the composite floor and a paving method of the composite floor, the foaming vinyl board used for the composite floor has certain elasticity, and structures, without groove holes, of a lock tongue connecting surface and a lock groove connecting surface have elasticity. When the spring bolt connecting face and the lock groove connecting face are matched and contacted with each other, the groove holes in the spring bolt connecting face and the lock groove connecting face deform, and the dislocation matching phenomenon is more prone to occurring, and the structure without the groove holes in the lock groove connecting face is contained in part of the groove holes in the spring bolt connecting face. At the moment, when bearing is generated at the joint of the spring bolt and the lock groove, under the action of pressure, due to the elasticity of the base plate, the groove hole and the structure without the groove hole are further extruded to form a structure similar to a suction cup, so that the spring bolt and the lock groove are combined more tightly, and the drawing force between the spring bolt and the lock groove is further improved; and the firmness of connection between the substrates is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of decorative floor, more particularly, to a foamed vinyl board for composite floor, a composite floor and a paving method thereof. BACKGROUND

[0002] In the field of building decoration materials, the surface of the decorative material has a covering, such as ceramic tiles, leather or wood veneer, etc. Ceramic tiles are widely used in home and commercial decoration due to their durability and aesthetic appearance. However, with the acceleration of modern life pace and the improvement of environmental awareness, the installation complexity and environmental friendliness of traditional ceramic tiles have become increasingly prominent. The installation process of traditional ceramic tiles is complicated and usually requires professional technicians to operate, which not only increases the construction cost but also prolongs the decoration period. At the same time, the installation of traditional ceramic tiles relies on cement mortar and other materials, which can easily produce a large amount of dust and noise during construction, causing adverse effects on the construction site and the surrounding environment, which does not meet the modern green and environmentally friendly construction concept. Secondly, the weight of traditional ceramic tiles is relatively large, which undoubtedly increases the load bearing burden of the floor and increases the difficulty and cost of structural design for high-rise buildings or places that require lightweight decoration.

[0003] In order to reduce the cost of ceramic tiles, more and more ultra-thin ceramic tiles are used in the existing way, but the thinner the ceramic tile is, the worse its strength will be. In the existing way, ultra-thin ceramic tiles are usually laid on the wall, and if used on the floor, the ceramic tiles are usually combined with other substrates. For example, the substrate is made of wood material, but the wood substrate will swell in a humid environment, and the swelling coefficient of the wood substrate is different from that of the ceramic tile, which can easily cause the ceramic tile to crack. In addition, the lock tongue and groove are provided on the wood substrate to cooperate with each other, and the cooperation firmness of the two is poor.

[0004] In some schemes, a plastic substrate is used to combine with ceramic tiles, but the application of such a substrate on large ceramic tiles will make the ceramic tiles heavier, which is not conducive to lightweight operation and increases the floor load. Moreover, after the formation of the lock, the surface of the lock is relatively smooth, and the cooperation firmness is poor. SUMMARY

[0005] The present application provides a foamed vinyl board for composite floor and a composite floor, which uses a foamed vinyl board to form a composite floor, realizes convenient paving of the composite floor, improves the firmness between the composite floor splices, and enables the composite floor to be applied to more occasions.

[0006] To achieve the above-mentioned purpose, the technical scheme provided by the present application is as follows:

[0007] A foamed vinyl board for composite floor, used for splicing adjacent composite floors.

[0008] Includes a substrate, said substrate having a density of 0.65–1.4 g / cm³. 3 The substrate is made of foamed vinyl board, with a latch protruding on at least one side and a lock groove recessed on at least one side; when the substrates are spliced, the latches and lock grooves on adjacent substrates are connected; the two opposite sides of the latch that are in contact with the lock groove are the latch connecting surfaces, and the two opposite sides of the lock groove that are in contact with the latch are the lock groove connecting surfaces.

[0009] The substrate is foamed to form a plurality of closed pores. After the material is removed from the substrate to form the latch and the lock groove, the closed pores are exposed. A large number of grooves are formed on the latch connection surface and / or the lock groove connection surface. The grooves increase the pull-out force between the latch and the lock groove by more than 1% under the same degree of fit.

[0010] The density of the aforementioned foamed substrate is 0.65-1.4 g / cm³. 3 The foam substrate can be any commercially available, known foam substrate (including PVC foam substrate, polystyrene (EPS) foam substrate, polyurethane (PU) foam substrate, polypropylene (PP) foam substrate, and polyethylene (PE) foam substrate). The foaming ratio of the foam substrate is 0.6-1.34, for example, the foaming ratio can be 0.6, 0.7, 0.8, 0.9, 1.0, 1.1, 1.2, 1.3, 1.34, etc., or within any two of the above values. If the foaming ratio is too small, the degree of foaming is low, and there are few closed cells formed in the substrate; if the foaming ratio is too large, the degree of foaming is high, and the closed cells formed in the substrate are too large, both of which are not conducive to the setting of groove holes.

[0011] In this solution, the base plate is connected to the cover plate in the composite flooring. When laying and splicing the composite flooring, the interlocking tongues and grooves between adjacent base plates engage to complete the installation. Compared to traditional composite flooring installation methods, this solution greatly simplifies the process. During installation, only the ground needs to be leveled before splicing the composite flooring; there is no need to lay cement on the ground, reducing the building's load-bearing capacity and improving the ease of installation. The interlocking tongues and grooves allow for simple splicing; the tongues are simply inserted into the grooves, making the installation process simple and convenient, requiring no professional workers.

[0012] Moreover, the composite floor in the present scheme is mainly laid on the ground, and the base plates are connected by the locking tongue and the locking groove. After connection, the decorative floor after laying is formed, which has a certain bearing capacity. When the locking tongue and the locking groove are not firmly connected due to errors in the ground leveling before laying the floor, the floor and the floor are often loose, reducing the comfort of the floor. In the present scheme, in order to avoid the loosening of the locking tongue and the locking groove, a large number of groove holes are provided on the locking tongue connecting surface and the locking groove connecting surface. When the locking tongue and the locking groove are connected, the groove holes on the locking tongue connecting surface and the locking groove connecting surface are misaligned, and some of the groove holes on the locking tongue connecting surface contain structures without groove holes on the locking groove connecting surface. Similarly, the groove holes on the locking groove connecting surface are also misaligned. This improves the roughness between the locking tongue connecting surface and the locking groove connecting surface, increases the friction between them, and thus enhances the pulling force between the locking tongue and the locking groove, improving the firmness of the connection between the base plates. During use, it is not easy to loosen. More importantly, the present scheme uses a foamed vinyl plate, which has a certain elasticity. When the locking tongue connecting surface and the locking groove connecting surface are in contact with each other, the groove holes on them are deformed and misaligned. Some of the groove holes on the locking tongue connecting surface contain structures without groove holes on the locking groove connecting surface. At this time, when the locking tongue and the locking groove are connected, under the action of pressure and due to the elasticity of the base plate, the groove holes and the structures without groove holes are further extruded to form a structure similar to a suction cup, making the connection between them more secure, thus further improving the pulling force between the locking tongue and the locking groove and the firmness of the connection between the base plates.

[0013] As a further improvement, a foamed area A1 is formed in the base plate, and the thickness of the foamed area A1 accounts for 95%-100% of the total thickness of the base plate. Preferably, the thickness of the foamed area A1 accounts for more than 99% of the total thickness of the base plate. More preferably, the thickness of the foamed area A1 accounts for 100% of the total thickness of the base plate. Since the base plate uses a foamed base plate, in order to make the strength of the locking tongue and the locking groove meet the use requirements, it is usually required that the thickness of the locking tongue and the locking groove accounts for 30%-60% of the thickness of the base plate. In order to ensure that a large number of groove holes can be distributed on the locking tongue connecting surface and the locking groove connecting surface, the thickness of the foamed area A1 accounts for at least 95% of the total thickness of the base plate. In the present scheme, full foaming is used in actual proofing, and skin treatment is used on the two opposite large surfaces of the base plate. Since the thickness of the skin is very thin, the ideal state is that the thickness of the foamed area A1 accounts for 100% of the total thickness of the base plate, so as to ensure that a large number of groove holes will be formed on the locking tongue connecting surface and / or the locking groove connecting surface when the base plate is processed to form the locking tongue and the locking groove.

[0014] As a further improvement, the average closed cell size in the foamed region is 80-120 microns. This range enables the recessed hole to be maximally consistent with the structure of the hole without recesses, making them more easily fitted.

[0015] As a further improvement, the average closed cell size in the foamed region is 80-120 microns. This range enables the recessed hole to be maximally consistent with the structure of the hole without recesses, making them more easily fitted.

[0016] As a further improvement, the average closed cell size in the foamed region is 80-120 microns. This range enables the recessed hole to be maximally consistent with the structure of the hole without recesses, making them more easily fitted.

[0017] As a further improvement, the average closed cell size in the foamed region is 80-120 microns. This range enables the recessed hole to be maximally consistent with the structure of the hole without recesses, making them more easily fitted.

[0018] As a further improvement, the average closed cell size in the foamed region is 80-120 microns. This range enables the recessed hole to be maximally consistent with the structure of the hole without recesses, making them more easily fitted.

[0019] As a further improvement, the average closed cell size in the foamed region is 80-120 microns. This range enables the recessed hole to be maximally consistent with the structure of the hole without recesses, making them more easily fitted.

[0020] As a further improvement, the average size of the maximum diameter of the groove holes is 60-100 microns. The opening of all the groove holes on each of the lock tongue connecting surface or lock groove connecting surface accounts for 30-90% of the surface area of each of the lock tongue connecting surface or lock groove connecting surface, and the substrate part between adjacent groove holes is elastic. The size of the groove holes and the distribution area of the groove hole openings on the lock tongue connecting surface or lock groove connecting surface are such that the groove holes on the lock tongue connecting surface or lock groove connecting surface have a suitable number of distribution, and the misalignment fitting condition can occur to the maximum extent.

[0021] As a further improvement, the center line of the thickness of the lock tongue and the lock groove deviates from the center line of the thickness of the substrate by less than 20% of the total thickness of the substrate, and the thickness of the lock tongue and the lock groove accounts for 30-60% of the thickness of the substrate. Moreover, the width of the lock tongue and the depth of the lock groove are 3-8 mm. Since the formed lock tongue and lock groove have lower strength after the substrate is foamed relative to the unfoamed substrate, in order to ensure that the strength of the lock tongue and the lock groove of the foamed substrate meets the paving requirements, the thickness of the lock tongue and the lock groove accounts for 30-60% of the thickness of the substrate, and the center line of the thickness of the lock tongue and the lock groove deviates from the center line of the thickness of the substrate by less than 20% of the total thickness of the substrate.

[0022] As a further improvement, the lock tongue and the lock groove are connected in interference fit.

[0023] As a further improvement, the foamed vinyl substrate is obtained in the following manner: the raw material components of the foamed substrate include: 25-40 parts by mass of ethylene-based monomer copolymer and / or homopolymer, 3-8 parts by mass of plasticizer, 1-5 parts by mass of stabilizer, 0.5-2 parts by mass of lubricant, 10-50 parts by mass of filler, and 0.5-5 parts by mass of foaming agent. The raw material components are mixed and shaped, and then extruded, cooled and cut to obtain a foamed vinyl substrate with a thickness of 3-12 mm.

[0024] The above-mentioned foamed substrate raw material is foamed to obtain a foamed vinyl substrate with a density of 0.65-1.4 g / cm 3 The foamed vinyl substrate has a large number of closed pores inside and a high elastic modulus, so the foot feeling of the composite floor is comfortable, and at the same time, the substrate of the foamed vinyl substrate can compensate for the gap of the assembled floor, making the composite floor more stable and less likely to produce gaps. In addition, the above-mentioned foamed vinyl substrate is also suitable for floors equipped with floor heating. When the temperature is not higher than 65℃, the closed pores inside the substrate have a heat insulation effect on one hand and can compensate for expansion on the other hand, so that the thermal expansion coefficient is very small and can be ignored, thereby not affecting the use of the composite floor.

[0025] The filler and the foaming agent in the foaming substrate raw material component not only need to consider the foaming and filling effects, but also need to consider the effects of the filler and the foaming agent on the subsequent process. For example, when the two opposite large surfaces of the substrate are subjected to corona pulse, the foaming agent forms closed pores in the substrate, and the filler can fill part of the pores to control the amount of closed pores. Since the closed pores can absorb energy during corona, the energy consumption is increased. Therefore, the mass fraction of the foaming agent is preferably controlled to be 0.5-5 parts, and the mass fraction of the filler is preferably controlled to be 10-50 parts.

[0026] As a further improvement, the foamed vinyl substrate further comprises 0.05-1 parts of an antifungal agent.

[0027] As a further improvement, when the raw material components of the foamed substrate are mixed, the mixing period is 20-25 min, and the addition sequence is vinyl monomer copolymer and / or homopolymer, filler, stabilizer, lubricant, plasticizer, and finally the foaming agent and the antifungal agent are added 5 minutes before the end of the mixing.

[0028] As a further improvement, one surface of the substrate is compounded with a film product containing an antifungal agent with a thickness of 1-3 mm. The film can be selected from EVA sheet, EVA film, IXPE sheet, IXPE film, IXPP sheet, IXPP film, PP sheet, PP film, PVC sheet or PVC film. The film is soft in texture, not only can isolate the ground water vapor, but also has the effect of resisting mold; in addition, the film is light in quality, which is beneficial to reduce the total weight of the composite floor; avoids the sound caused by stepping, so that the composite floor has a certain shock-absorbing effect as a whole.

[0029] The present application also provides a composite floor comprising the foamed vinyl substrate for the composite floor, and further comprising a cover, the cover and the substrate surface are bonded together. The cover can be composed of materials selected from the group consisting of sliceable natural stone, marble, granite, slate, glass, ceramic, leather and wood skin.

[0030] The present application also provides a laying method of the composite floor, after the ground is leveled, the composite floor is placed on the ground, and the next composite floor is assembled with the previous composite floor through the locking tongue and the locking groove, and the covers of the composite floors are all upward. The ground leveling can be achieved by using some equipment, such as a level, a theodolite and the like, so that the laid surface appears flat and has no slope.

[0031] Compared with the prior art, the technical scheme provided by the present application has the following beneficial effects:

[0032] (1) The foamed vinyl board for composite floor of the present application, in the scheme, the base plate is connected with the cover in the composite floor, when the composite floor is laid and spliced, the lock tongue and the lock groove between the adjacent base plates are connected by mutual cooperation, and the laying of the composite floor is completed. Compared with the traditional laying method of the floor composite floor, the laying method of the composite floor is greatly simplified, and the convenience of the floor laying is improved. The foamed vinyl board has a certain elasticity, the structure without groove hole on the lock tongue connecting surface and the lock groove connecting surface has elasticity, when the lock tongue connecting surface and the lock groove connecting surface are in contact with each other, the groove hole thereon is deformed and more prone to misalignment, at this time, when the load is generated at the connection between the lock tongue and the lock groove, under the action of pressure, and due to the elasticity of the base plate, the groove hole and the structure without groove hole are further extruded to form a structure similar to a suction cup, so that the combination between the two is more compact, thereby further improving the pulling force between the lock tongue and the lock groove, and improving the firmness of the connection between the base plates.

[0033] (2) The foamed vinyl board for composite floor of the present application, in order to ensure that a large number of groove holes can be distributed on the lock tongue connecting surface and the lock groove connecting surface, the thickness of the foamed area A1 is at least 95% of the total thickness of the base plate.

[0034] (3) The foamed vinyl board for composite floor of the present application, the base plate is foamed and treated, a large number of closed pores are formed inside, and the elastic modulus is high, therefore, the composite floor has comfortable foot feeling, and the base body of the foamed vinyl board can compensate the gap of the splicing, so that the splicing of the composite floor is more stable and less prone to gaps. In addition, the foamed vinyl board is also suitable for the floor with floor heating, when the temperature is not higher than 65 DEG C, the closed pores inside the base plate have heat insulation effect on the one hand, and can compensate the expansion on the other hand, so that the thermal expansion coefficient is very small and can be ignored, thereby not affecting the use of the composite floor. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1 It is a schematic view of the base plate structure;

[0036] Figure 2 It is a schematic view of the base plate along the thickness direction;

[0037] Figure 3 It is Figure 2 It is a schematic view of the enlarged structure at A in the middle;

[0038] Figure 4 It is a schematic view of the inclined setting of the lock tongue connecting surface;

[0039] Figure 5 It is a schematic view of the connection state of the lock tongue and the lock groove when the lock tongue connecting surface is inclined;

[0040] Figure 6 Enlarged view of the foamed structure of the substrate along the cross section of its thickness direction;

[0041] Figure 7 In actual, one case of the schematic view of the adjacent substrate splicing state;

[0042] Figure 8 The schematic view of the chamfer setting at the connection between the laying surface and the side surface of the substrate near the side of the lock tongue;

[0043] Figure 9 The schematic view of the chamfer setting at the connection between the laying surface and the side surface of the substrate near the side of the lock slot;

[0044] Figure 10 The schematic view of the structure when the arc is set at the end of the lock tongue away from the substrate;

[0045] Figure 11 The average value trend chart of the test pulling force in one case;

[0046] Figure 12 The schematic view of the composite floor structure;

[0047] Figure 13 The example chart of the pulling force test process.

[0048] Label explanation:

[0049] 1, substrate; 11, lock tongue; 111, lock tongue connecting surface; 12, lock slot; 121, lock slot connecting surface; 13, recess hole; 100, chamfer; 101, side surface one; 102, side surface two; 2, covering piece. DETAILED DESCRIPTION

[0050] In order to further understand the content of the present application, the present application is described in detail in combination with the drawings and examples.

[0051] The structure, proportion, size, etc. shown in the drawings of the present specification are only used to cooperate with the content disclosed in the specification, to be understood and read by those skilled in the art, and do not define the limiting conditions for the implementation of the present application, so they do not have technical substantive significance. Any modification of the structure, change of the proportion relationship or adjustment of the size, without affecting the effect and purpose that can be achieved by the present application, should still fall within the scope covered by the disclosed technical content of the present application.

[0052] Meanwhile, the terms such as "upper", "lower", "left", "right", "intermediate", and the like, cited in the present specification, are merely for the convenience of clear description, and are not intended to limit the range of implementation, and the change or adjustment of the relative relationship, without substantial change in the technical content, is also regarded as the implementation scope of the present application. In addition, in addition to being used to represent the orientation or positional relationship, the above-mentioned part of the terms can also be used to represent other meanings, for example, the term "upper" can also be used to represent a certain dependent relationship or connection relationship in some cases. For those skilled in the art, the specific meaning of these terms in the present application can be understood according to the specific circumstances.

[0053] It should be noted that the terms "first", "second", and the like in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects and do not necessarily describe a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein.

[0054] The present embodiment provides a foamed vinyl base plate for composite floor, the base plate 1 has two opposite target surfaces, one of which is used to connect with the cover 2, and the cover 2 used can be leather, wood veneer or ceramic tile, etc., when ceramic tile is used, the ceramic tile is ultra-thin ceramic tile, and the thickness of the ultra-thin ceramic tile is usually below 6mm, for example, the thickness of the ceramic tile is 4mm, 5mm or 6mm. The present embodiment is described by taking the ultra-thin ceramic tile as an example.

[0055] In combination with Figure 1 and Figure 2 As shown in the present embodiment, the foamed vinyl base plate for composite floor provided by the present embodiment includes a base plate 1, the base plate 1 has two opposite target surfaces as large surfaces, one of which is used to connect with the ceramic tile as a connecting surface, and the other as a laying surface. The side surface adjacent to the target surface includes two opposite side surfaces one 101 and two opposite side surfaces two 102. One side surface one 101 and one side surface two 102 adjacent to each other are provided with a lock tongue 11 protruding therefrom, and the other side surface one 101 and the other side surface two 102 adjacent to each other are provided with a lock groove 12 recessed therefrom. When two base plates 1 are spliced, the lock tongue 11 and the lock groove 12 on the adjacent base plates 1 are connected in cooperation; the two opposite side surfaces of the lock tongue 11 in contact with the lock groove 12 are the lock tongue connecting surfaces 111, and the two opposite side surfaces of the lock groove 12 in contact with the lock tongue 11 are the lock groove connecting surfaces 121.

[0056] It should be noted that in some cases, only one of the two opposite side surfaces one 101 is provided with a lock tongue 11 or a lock groove 12, and only one of the two opposite side surfaces two 102 is provided with a lock tongue 11 or a lock groove 12.

[0057] The substrate 1 is generally square, and the lock tongue 11 and the lock groove 12 are formed by milling on the substrate 1, so that the lock tongue 11 and the lock groove 12 are integrally formed on the substrate 1, and the substrate 1 has good integrity.

[0058] In combination with the drawings of Figure 2 , Figure 3 and Figure 6 , the substrate 1 is a foamed vinyl substrate, and the density of the vinyl substrate is 0.65-1.4 g / cm 3 . After foaming, a plurality of closed pores are formed in the substrate 1. After the lock tongue 11 and the lock groove 12 are formed on the substrate 1 by removing material, a plurality of recess holes 13 are formed on the lock tongue connecting surface 111 and the lock groove connecting surface 121. The recess holes make the pulling force between the lock tongue and the lock groove increase by more than 1% under the same fitting degree between the lock tongue and the lock groove. The increase in the pulling force can be 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29%, 31%, 32%, 33%, 34%, 35%, 36%, 37%, 38%, 39%, 40%, 41%, 42%, 43%, 44%, 45%, 46%, 47%, 48%, 49%, 50%, 51%, 52%, 53%, 54%, 55%, 56%, 57%, 58%, 59%, 60%, 71%, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, or 100%.

[0059] Regarding the recess holes 13, specifically, the foaming in the substrate 1 forms closed pores, and the lock tongue 11 and the lock groove 12 are formed on the substrate 1 by removing material by milling, and part of the closed pores become open pores, i.e., the recess holes 13, at the lock tongue connecting surface 111 and the lock groove connecting surface 121.

[0060] It should be noted that in some cases, the recess holes can be provided only on the lock tongue connecting surface 111 or only on the lock groove connecting surface 121, which can also increase the roughness between the lock tongue connecting surface 111 and the lock groove connecting surface 121 and increase the friction therebetween, thereby enhancing the pulling force between the lock tongue and the lock groove, which can be applied to some occasions where the pulling force between the substrates is not required to be high.

[0061] The same fitting degree between the locking tongue 11 and the locking groove 12 refers to the same depth and width of the locking tongue 11 and the locking groove 12, the same contact area when the two are connected to each other, and the same interference fitting degree between the locking tongue 11 and the locking groove 12.

[0062] The pulling force is the force measured when the locking tongue and the locking groove of the adjacent base plate move at a uniform speed when the adjacent base plate locking tongue and the locking groove are fitted with each other. The pulling force is measured when the locking tongue and the locking groove are pulled in the width direction of the protrusion of the locking tongue or the depth direction of the recess of the locking groove. The direction is specifically the direction indicated by B in Figure 1 and Figure 13 .

[0063] The base plate in the scheme is connected with the cover in the composite floor, and when the composite floor is laid and spliced, the adjacent base plates are connected with each other through the fitting connection of the locking tongue 11 and the locking groove 12, so that the laying of the composite floor is completed. Compared with the traditional laying method of the floor composite floor, the laying method of the composite floor is greatly simplified. When laying, after the ground is leveled, the splicing of the composite floor can be performed, and cement does not need to be laid on the ground, so that the building load is reduced, and the convenience of floor laying is improved. Through the fitting connection of the locking tongue 11 and the locking groove 12, the locking tongue is inserted into the locking groove during splicing, so that the laying process is simple and convenient, and professional workers are not needed to complete the laying.

[0064] Moreover, the composite floor in the scheme is mainly paved on the ground, and the base plate 1 is connected through the lock tongue 11 and the lock groove 12, and after connection, the decorative floor after paving is formed, which has a certain bearing capacity. When the lock tongue 11 and the lock groove 12 are not firmly connected, the floor and the floor are often loose, which reduces the comfort of the floor. In order to avoid the loosening of the lock tongue 11 and the lock groove 12, a large number of groove holes are arranged on the lock tongue connecting surface 111 and the lock groove connecting surface 121. When the lock tongue 11 and the lock groove 12 are connected, the groove holes 13 on the lock tongue connecting surface 111 and the lock groove connecting surface 121 are misaligned, and some of the groove holes 13 on the lock tongue connecting surface 111 contain the structure without groove holes on the lock groove connecting surface 121. Similarly, the groove holes on the lock groove connecting surface also have the same effect. This improves the roughness between the lock tongue connecting surface 111 and the lock groove connecting surface 121, increases the friction between them, thereby enhancing the pulling force between the lock tongue 11 and the lock groove 12, and improving the firmness of the connection between the base plates. It is not easy to loosen during use. More importantly, the foamed vinyl base plate is used in the scheme, which has a certain elasticity, and the structure without groove holes on the lock tongue connecting surface 111 and the lock groove connecting surface 121 has elasticity. When the lock tongue connecting surface 111 and the lock groove connecting surface 121 are in contact with each other, the groove holes on them are deformed and misaligned, and some of the groove holes on the lock tongue connecting surface 111 contain the structure without groove holes on the lock groove connecting surface 121. At this time, when the load is generated at the connection between the lock tongue 11 and the lock groove 12, the groove holes and the structure without groove holes are further extruded under the action of pressure, which can form a structure similar to a suction cup, so that the combination between them is more closely, thereby further improving the pulling force between the lock tongue and the lock groove, and improving the firmness of the connection between the base plates.

[0065] In addition, the base plate 1 is a foamed vinyl base plate, which further reduces the increased building weight during decoration. Moreover, a large number of closed hole structures are formed in the base plate 1, which can reduce the expansion coefficient of the base plate. The base plate 1 is used together with the ceramic tile to form the floor after decoration and paving, and the floor paving environment may be outdoor or indoor, cold or hot, humid, etc. Especially when the base plate is used together with the ceramic tile, the ceramic tile usually expands or shrinks less in different environments, but the expansion coefficient of the base plate 1 is larger than that of the ceramic tile. In the scheme, a large number of closed hole structures are formed in the base plate 1. When the base plate 1 expands or shrinks in some environments, the closed hole structure can balance the size change of the base plate 1, thereby reducing the expansion coefficient of the base plate 1, and avoiding the breakage of the ceramic tile due to the large size change of the base plate 1.

[0066] Furthermore, in this solution, the flooring is laid on the ground, where heavy objects are often dropped. When ultra-thin ceramic tiles are used, the substrate 1 forms a large number of closed-cell structures, which can improve the elasticity of the substrate 1 and give it a better cushioning effect. If a heavy object falls onto the tile, the cushioning effect of the substrate 1 can effectively prevent the heavy object from damaging the tile.

[0067] In the experiment, foamed and non-foamed vinyl boards of the same size were selected, with the foamed vinyl board having a density of 0.85 g / cm³. 3 The density of the non-foamed vinyl board is 1.6 g / cm³. 3 All dimensions are 100mm*100mm*5mm (length*width*thickness). The thickness of both the latch 11 and the lock groove 12 is 1.8mm. The protruding width of the latch 11 is 3.5mm, and the recess depth of the lock groove 12 is 5mm. The length of the mating connection between the latch 11 and the lock groove 12 is 100mm. The testing speed is 100mm / min. Figure 13 As shown, the testing equipment used is a JF-100A, manufactured by Dongguan Jianfeng Instrument Co., Ltd. Each sample group consists of 5 pieces, and the average pull-out force is calculated. Details are shown in the table below:

[0068]

[0069] like Figure 6 As shown, a foamed region A1 is formed near the center of substrate 1, and the thickness of foamed region A1 accounts for more than 95% of the total thickness of substrate 1. Preferably, the thickness of foamed region A1 accounts for 99%-100% of the total thickness of substrate. More preferably, the thickness of foamed region A1 accounts for 100% of the total thickness of substrate. Since the substrate is a foamed substrate, in order to ensure that the strength of latch 11 and latch groove 12 meets the usage requirements, the thickness of latch 11 and latch groove 13 is usually required to account for 30% to 60% of the substrate thickness. In order to ensure that a large number of grooves and holes 13 can be distributed on latch connecting surface 111 and latch connecting surface 121, the thickness of foamed region A1 is at least 95% of the total thickness of substrate. In this scheme, substrate 1 adopts a full foaming method in actual prototyping, and a skinning treatment is applied to the two opposite large surfaces of substrate 1. Since the skin thickness is very thin, the ideal state is that the thickness of foamed region A1 accounts for 100% of the total thickness of substrate.

[0070] The average closed-cell size in foaming region A1 is 80-120 micrometers. The average closed-cell size per unit volume in substrate 1 decreases from its center to its top or bottom surface.

[0071] Both the latch connecting surface 111 and the lock groove connecting surface 121 are located in the foaming area A1. The irregular distribution of the foamed closed pores formed in the substrate 1 results in an irregular distribution of the recessed holes 13 on the latch connecting surface 111 and the lock groove connecting surface 121. Regarding the irregular distribution of the recessed holes 13, the recessed holes 13 are randomly located at different positions on the latch connecting surface 111 and the lock groove connecting surface 121, and the size, shape, and depth of each recessed hole 13 embedded in the substrate may be the same or different.

[0072] Specifically, the recessed hole 13 includes an opening and a recessed portion connected to the opening and recessed in the substrate. The opening is located on the latch connecting surface 111 or the lock groove connecting surface 121. The recessed portion is arc-shaped, and the maximum arc length of the recessed portion is less than the maximum circumference of the closed hole when the recessed hole is closed. Figure 3 As shown, the recessed holes 13 are embedded to different depths into the substrate 1. The most preferred embodiment is an arc-shaped recess. The maximum arc length of the recess is less than the maximum circumference of the closed hole when it is located in the recessed hole. For example, the arc length of some recesses is equal to half the maximum circumference of the closed hole, some are greater than half the maximum circumference, and some are less than half the maximum circumference. Furthermore, recesses of different sizes are irregularly distributed on the latch connecting surface and the lock groove connecting surface. In this case, the recesses of different sizes on the latch connecting surface 111 and the lock groove connecting surface 121 are misaligned, resulting in a more uniform and similar roughness on different parts of the latch connecting surface 111 and the lock groove connecting surface 121. This improves the uniformity of the connection between different parts of the latch and the lock groove, especially for longer substrates, such as those with a length of 1000 cm or more, thus preventing poor connection strength at some connection points between the latch 11 and the lock groove 12.

[0073] In this design, the average maximum diameter of the recessed hole 13 is 60-100 micrometers, more preferably 70-90 micrometers. The opening of all the recessed holes 13 on each latch connecting surface 111 or lock groove connecting surface 121 occupies 30%-90% of the surface area of ​​each latch connecting surface 111 or lock groove connecting surface 121, and the substrate portion between adjacent recessed holes 13 is elastic, allowing the recessed holes 13 to deform.

[0074] Combined Figure 6As shown, the average closed-cell size per unit volume within substrate 1 decreases from its center towards the top or bottom surface. The closer to the center of substrate 1 in the thickness direction, the higher the degree of foaming, and the lower the structural strength at that point. To ensure that the strength of the latch and groove of the foamed substrate meets the layup requirements, preferably, the thickness of the latch 11 and groove 12 accounts for 30% to 60% of the substrate thickness, and the deviation of the centerline of the latch and groove thickness from the centerline of the substrate thickness is less than 20% of the total substrate thickness. For example, the thickness of the latch 11 and the locking groove 12 accounts for, for example, 30%, 31%, 32%, 33%, 34%, 35%, 36%, 37%, 38%, 39%, 40%, 41%, 42%, 43%, 44%, 45%, 46%, 47%, 48%, 49%, 50%, 51%, 52%, 53%, 54%, 55%, 56%, 57%, 58%, 59%, or 60% of the thickness of the substrate 1. The protruding width of the latch 11 and the recessed depth of the locking groove 12 are 3 to 8 mm, for example, the width or depth can be selected as 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, 5.5 mm, 6 mm, 6.5 mm, 7 mm, 7.5 mm, or 8 mm, and the protruding width of the latch 11 and the recessed depth of the locking groove 12 can be the same or different. On the one hand, it meets the requirements of elasticity and number of closed holes of substrate 1, and on the other hand, it needs to meet certain strength requirements of substrate 1, such as preventing damage when locking tongue 11 and locking groove 12 are engaged.

[0075] Combination Figure 7 , Figure 8 and Figure 9 As shown, substrate 1 has two opposing target surfaces, where target surface one is used for connection with the cover and target surface two serves as the laying surface. When adjacent substrates 1 are spliced, for example, after the first substrate is laid, the locking groove 12 of the first substrate awaits splicing, and the second substrate is held close to the first substrate for splicing, with the locking tongue 11 of the second substrate awaiting splicing. During this process, the second substrate is held with a certain tilt. As the locking tongue 11 enters the locking groove 12 during splicing, the second substrate is gradually flattened. A chamfer 100 is provided at the connection between the laying surface and the side of the substrate 1 where the locking tongue 11 is located, to prevent the locking tongue 11 from jamming when the second substrate is flattened, and at the same time, the second substrate is easier to push.

[0076] In other cases, a transition arc can also be provided at the connection between the laying surface and the side where the latch 11 is provided on the substrate 1.

[0077] In another scenario, the rounded or chamfered design can also be located at the connection point between the laying surface and the side of the locking groove 12 on the substrate 1. In this case, the locking tongue 11 awaits splicing after the first substrate is laid.

[0078] Furthermore, the 100° chamfer or transition arc can better prevent the substrate from being damaged by debris on the ground during installation. Compared to the absence of a chamfer or transition arc, where the substrate 1 is at a right angle, if there are debris on the ground during installation, the right angle is easily damaged or scratched by the debris when the substrate 1 is pushed, forming a stress concentration point. During the use of the substrate 1, if a sudden external force occurs, such as a heavy object falling, or under heating conditions, cracks are likely to appear at the stress concentration point, affecting the service life of the substrate 1.

[0079] like Figure 10 As shown, the end of the latch 11 away from the base plate is arc-shaped, which provides a certain guide when the latch 11 is inserted into the lock groove 1, and improves the convenience of splicing.

[0080] In a preferred embodiment, the latch connecting surface 111 and the lock groove connecting surface 121 are flush with the surface of the substrate 1, which facilitates the processing and formation of the latch 11 and the lock groove 12.

[0081] Combination Figure 4 and Figure 5 As shown, in another embodiment, the latch 11 has its root at one end near the center of the substrate 1 and its free end at the other end; at least one latch connecting surface 111 is inclined, so that the thickness of the latch 11 gradually increases from the free end to the root. Alternatively, at least one lock groove connecting surface 121 may be inclined, so that the size of the lock groove 12 gradually increases from the opening to the bottom surface. Furthermore, the inclination angle of the latch connecting surface 111 or the lock groove connecting surface 121 relative to the surface of the substrate 1 is α, where the angle α ranges from 0° to 10°. This arrangement makes it easier for the latch 11 to be inserted into the latch 12.

[0082] Whether the latch connecting surface 111 and the lock groove connecting surface 121 are flush or inclined, the connection between the latch 11 and the lock groove 12 is an interference fit. This interference fit allows the lock groove to clamp the latch more tightly, further improving the pull-out force. The degree of interference between the latch 11 and the lock groove 12 depends on the substrate itself, such as its density. In this embodiment, the foamed vinyl board has a density of 0.85 g / cm³. 3 The relationship between the interference between the latch 11 and the lock groove 12 and the pull-out force between the latch and the lock groove is explained.

[0083] Table 1. Record of Pull-out Force Test Between Lock Tongue and Lock Groove

[0084]

[0085] Combination Figure 13 As shown, the testing equipment used is a JF-100A, manufactured by Dongguan Jianfeng Instrument Co., Ltd., and the sample foamed vinyl board has a density of 0.85 g / cm³.3 The latch connecting surface 111 and the lock groove connecting surface 121 are flush with the surface of the substrate 1, and their dimensions are both 100mm*100mm*5mm (length*width*thickness). The protruding width of the latch 11 is 3.5mm, the recess depth of the lock groove 12 is 5mm, and the length of the mating connection between the latch 11 and the lock groove 12 is 100mm. The test speed is 100mm / min, and the results are tested three times for each sample.

[0086] like Figure 11 As shown in the curve of Series 1, when the interference between the latch 11 and the lock groove 12 is greater than 0.15, the pull-out force between them increases more significantly with the increase of the interference. Therefore, the interference between the latch 11 and the lock groove 12 can preferably be set in the range of 0.15 or higher. Tests revealed that when the interference between the latch 11 and the lock groove 12 reaches 0.3, the lock groove 12 tends to break after the latch 11 enters it. Therefore, the interference between the latch 11 and the lock groove 12 should be set below 0.3.

[0087] It should be noted that the data in Table 1 represents a substrate density of 0.85 g / cm³. 3 When the substrate density is otherwise obtained, the interference fit between the latch 11 and the lock groove 12 will also be otherwise selected, and the specific value will be obtained based on the test.

[0088] It should also be noted that the interference fit between the latch 11 and the lock groove 12 is related to the foaming ratio. For example, when the same pull-out force is required, a higher foaming ratio results in more grooves and holes, which has a greater impact on the roughness between the latch 11 and the lock groove 12. In this case, the interference fit between the latch 11 and the lock groove 12 can be reduced. Similarly, the specific data for the interference fit can be obtained through testing.

[0089] In this scheme, the closed pores in substrate 1 are formed by foaming. As a preferred embodiment, the foamed vinyl sheet is obtained by mixing and extrusion. The mixing step involves uniformly mixing 25 parts of vinyl monomer copolymer and / or homopolymer, 3 parts of plasticizer, 1 part of stabilizer, 0.5 parts of lubricant, 10 parts of filler, and 0.5 parts of foaming agent to obtain a vinyl mixed raw material. The extrusion step involves shaping the vinyl mixed raw material, extruding, cooling, and cutting it to obtain a vinyl sheet with a thickness of 3 mm.

[0090] Furthermore, the foamed vinyl board also includes 0.05 parts of antifungal agent. The mixing process takes 20 minutes, and the order of addition is vinyl raw material, filler, stabilizer, lubricant, plasticizer, and finally, the foaming agent and antifungal agent are added 5 minutes before the end of the mixing process.

[0091] In another embodiment, the foamed vinyl sheet is obtained by mixing and extrusion. The mixing step involves uniformly mixing 40 parts of vinyl monomer copolymer and / or homopolymer, 8 parts of plasticizer, 5 parts of stabilizer, 2 parts of lubricant, 50 parts of filler, and 5 parts of foaming agent to obtain a vinyl mixture. The extrusion step involves shaping the vinyl mixture, extruding, cooling, and cutting it to obtain a vinyl sheet with a thickness of 12 mm.

[0092] Furthermore, the foamed vinyl board also includes one part of anti-mold agent. The mixing process takes 25 minutes, and the order of addition is vinyl raw material, filler, stabilizer, lubricant, plasticizer, and finally, the foaming agent and anti-mold agent are added 5 minutes before the end of the mixing process.

[0093] In another embodiment, the foamed vinyl sheet is obtained by mixing and extrusion. The mixing step involves uniformly mixing 32 parts of vinyl monomer copolymer and / or homopolymer, 5 parts of plasticizer, 3 parts of stabilizer, 1 part of lubricant, 30 parts of filler, and 3 parts of foaming agent to obtain a vinyl mixture. The extrusion step involves shaping the vinyl mixture, extruding, cooling, and cutting it to obtain a vinyl sheet with a thickness of 6 mm.

[0094] Furthermore, the foamed vinyl board also includes 0.5 parts of anti-mold agent. The mixing process takes 22 minutes, and the order of addition is vinyl raw material, filler, stabilizer, lubricant, plasticizer, and finally, the foaming agent and anti-mold agent are added 5 minutes before the end of the mixing process.

[0095] Preferably, in the above-mentioned materials, the vinyl monomer copolymers and / or homopolymers are selected from polyethylene, polyvinyl chloride, polystyrene, polymethacrylate, polyacrylate, polyacrylamide, ABS, (acrylonitrile-butadiene-styrene) copolymer, polypropylene, ethylene-propylene copolymer, polyvinylidene chloride, polytetrafluoroethylene, polyvinylidene fluoride, hexafluoropropylene, and styrene-maleic anhydride copolymer. The plasticizer is dibutyl phthalate, the stabilizer is an organotin stabilizer, the lubricant is one or more combinations of calcium stearate and n-butyl stearate, the filler is one or more combinations of powdered calcium carbonate, talc, silica powder, glass fiber, alumina, and wollastonite, and the foaming agent is one or more combinations of azobisisobutyronitrile and hydrogen peroxide. To give the foamed vinyl board anti-mildew properties, it also contains 0.05-1 parts by weight of an anti-mildew agent, which is one or more combinations of potassium sorbate and butylamine 3-iodo-2-propynylcarbamate. The above-mentioned raw materials are foamed to obtain the vinyl board of the invention, the density of which is 0.65-1.4 g / cm³. 3 The interior of the vinyl ester sheet contains a large number of closed pores and some closed air pores.

[0096] The substrate is laminated with a 1-3mm thick membrane containing an antifungal agent. The membrane can be selected from EVA sheets, EVA films, IXPE sheets, IXPE films, IXPP sheets, IXPP films, PP sheets, PP films, PVC sheets, or PVC films. The membrane is relatively soft, effectively isolating moisture from the ground and providing antifungal properties. Furthermore, its lightweight nature helps reduce the overall weight of the composite flooring and minimizes noise from footsteps, thus providing some shock absorption.

[0097] The present invention also provides a composite flooring, comprising the aforementioned foamed vinyl board for composite flooring, and further comprising a cover 2, wherein the cover 2 is bonded to the surface of the substrate 1. The cover 2 and the surface of the substrate 1 are bonded together, and the two can be connected by any existing means, such as by adhesive bonding.

[0098] In combination Figure 5 As shown, the cover 2 takes ultra-thin ceramic tile as an example. The ultra-thin ceramic tile is bonded to the target surface of the substrate 1. After the ceramic tile and the substrate 1 are connected, the relative position between the edge of the ceramic tile and the edge of the substrate 1 also determines whether there is a gap between adjacent ceramic tiles after installation.

[0099] For example, in one scenario, the tile size is relatively small compared to the substrate size, and after installation, the edges of adjacent substrates are close together. In this case, there is a certain gap between adjacent tiles, and grout can be applied into this gap.

[0100] In another scenario, the substrate size is relatively small compared to the tile size, and after installation, the edges of adjacent tiles are close together. In this case, a seamless tile installation is formed.

[0101] The relative position between the edge of the tile and the edge of the substrate 1 can be determined according to customer requirements.

[0102] This invention also provides a method for installing composite flooring. Compared to traditional flooring, especially ceramic tile flooring, this method eliminates the need for laying cement on the ground. During installation, after leveling the ground, the composite flooring described above is placed on the ground. The next type of composite flooring is then assembled with the previous type using locking tongues and grooves. All the cover pieces of the composite flooring face upwards. This method greatly simplifies the installation of composite flooring, reduces the building's load-bearing capacity, and improves the convenience of flooring installation.

[0103] The present invention and its embodiments have been described above illustratively. This description is not restrictive, and the figures shown are only one embodiment of the present invention; the actual structure is not limited thereto. Therefore, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A foamed vinyl board for use in composite flooring, for splicing adjacent composite floorboards; characterized in that: Includes a substrate (1), said substrate (1) having a density of 0.65 to 1.4 g / cm³. 3 The substrate (1) is made of foamed vinyl board material. At least one side of the substrate (1) is provided with a protruding latch (11) and at least one side is provided with a recessed locking groove (12). When the substrates (1) are spliced, the latches (11) and locking grooves (12) on adjacent substrates (1) are connected. The two opposite sides of the latch (11) that are in contact with the locking groove (12) are the latch connecting surfaces (111), and the two opposite sides of the locking groove (12) that are in contact with the latch (11) are the locking groove connecting surfaces (121). The substrate (1) is foamed to form a plurality of closed pores. After the material is removed from the substrate (1) to form the latch (11) and the lock groove (12), the closed pores are exposed on the latch connecting surface (111) and / or the lock groove connecting surface (121) to form a large number of groove holes (13). The groove holes (13) increase the pull-out force between the latch (11) and the lock groove (12) by more than 1% under the same degree of fit between the latch (11) and the lock groove (12).

2. The foamed vinyl board for composite flooring according to claim 1, characterized in that: The foaming ratio of the substrate (1) is 0.6-1.

34.

3. The foamed vinyl board for composite flooring according to claim 1, characterized in that: A foamed region (A1) is formed in the substrate (1), and the thickness of the foamed region (A1) accounts for 95%-100% of the total thickness of the substrate (1).

4. The foamed vinyl board for composite flooring according to claims 1-3, characterized in that: The average closed pore size in the foaming zone (A1) is 80-120 micrometers.

5. The foamed vinyl board for composite flooring according to claim 4, characterized in that: The average size of closed holes per unit volume in the substrate (1) decreases from its center to its top or bottom surface.

6. The foamed vinyl board for composite flooring according to claim 5, characterized in that: Both the latch connecting surface (111) and the lock groove connecting surface (121) are located in the foaming area (A1).

7. The foamed vinyl board for composite flooring according to claim 6, characterized in that: The irregular distribution of foamed closed pores formed in the substrate (1) results in the irregular distribution of the groove holes (13) on the latch connecting surface (111) and the lock groove connecting surface (121).

8. The foamed vinyl board for composite flooring according to claim 6, characterized in that: The groove hole (13) includes an opening and a recessed portion connected to the opening and recessed in the substrate. The opening is located on the latch connecting surface (111) or the lock groove connecting surface (121). The recessed portion is arc-shaped, and the maximum arc length of the recessed portion is less than the maximum circumference of the closed hole when the groove hole is closed.

9. The foamed vinyl board for composite flooring according to claim 6, characterized in that: The average size of the maximum diameter of the groove (13) is 60-100 micrometers.

10. The foamed vinyl board for composite flooring according to claim 6, characterized in that: The opening of all the groove holes (13) on each of the latch connecting surfaces (111) or lock groove connecting surfaces (121) occupies 30%-90% of the surface area of ​​each of the latch connecting surfaces (111) or lock groove connecting surfaces (121) where it is located, and the base plate portion between adjacent groove holes (13) is elastic.

11. The foamed vinyl board for composite flooring according to claim 6, characterized in that: The center line of the thickness of the latch (11) and the lock groove (12) deviates from the center line of the thickness of the substrate (1) by less than 20% of the total thickness of the substrate (1), and the thickness of the latch (11) and the lock groove (12) accounts for 30% to 60% of the thickness of the substrate (1).

12. The foamed vinyl board for composite flooring according to claim 11, characterized in that: The width of the protruding latch (11) and the depth of the recessed lock groove (12) are 3 to 8 mm.

13. The foamed vinyl board for composite flooring according to claim 11, characterized in that: The locking tongue (11) and the locking groove (12) are connected by an interference fit.

14. The foamed vinyl board for composite flooring according to claim 4, characterized in that: The foamed vinyl board is obtained as follows: the raw material components of the foamed substrate include: 25-40 parts by weight of vinyl monomer copolymer and / or homopolymer, 3-8 parts by weight of plasticizer, 1-5 parts by weight of stabilizer, 0.5-2 parts by weight of lubricant, 10-50 parts by weight of filler, and 0.5-5 parts by weight of foaming agent. The raw material components are mixed and shaped, extruded, cooled, and cut to obtain a foamed vinyl board with a thickness of 3-12 mm.

15. The foamed vinyl board for composite flooring according to claim 14, characterized in that: The foamed vinyl board also includes 0.05-1 part of antifungal agent.

16. The foamed vinyl board for composite flooring according to claim 14, characterized in that: When mixing the raw material components of the foamed substrate, the mixing cycle is 20-25 minutes. The order of addition is vinyl monomer copolymer and / or homopolymer, filler, stabilizer, lubricant, plasticizer, and finally, the foaming agent is added 5 minutes before the end of the mixing.

17. The foamed vinyl board for composite flooring according to claim 14, characterized in that: The substrate has a 1-3 mm thick film containing an antifungal agent laminated to one surface.

18. A composite flooring, characterized in that: The foamed vinyl board for composite flooring as described in any one of claims 1-17 further includes a cover that is bonded to the surface of the substrate (1).

19. A method for installing the composite flooring according to claim 18, characterized in that: After the ground is leveled, the composite flooring described above is placed on the ground. The composite flooring described below is then assembled with the composite flooring described above using locking tongues and locking grooves, with all the covering parts of the composite flooring facing upwards.

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