Double-sided dovetail groove ceramic tile upper mold core and ceramic tile made thereof

Abstract

A double-sided dovetail groove ceramic tile upper mold core and a ceramic tile made thereof, comprising an upper mold core base 50 provided with protrusions 501 and grooves 502 and an upper mold core surface rubber 60, so as to form convex patterns 10 and concave patterns 20 corresponding to the protrusions 501 and the grooves 502, the convex patterns 10 and the concave patterns 20 are arranged on the entire surface of the upper mold core base 50 in an interlaced manner, the width of the convex pattern top 101 of the convex pattern 10 is greater than the width of the convex pattern bottom 102, the opening width of the concave pattern top 201 of the concave pattern 20 is less than the width of the concave pattern bottom 202, the convex pattern top 101 is provided with a concave portion 110, and the two ends of the concave portion 110 are connected to the two oblique sides (103, 104) of the convex pattern 10 through two undercut edges (111, 112) to form an acute angle. The beneficial effects of the present invention are as follows: due to the use of a double-sided dovetail groove mold for pressing, by adjusting the parameters of the press and the various components of the press, complete demoulding is achieved after the press produces the tile, and the pressed tile green body has a double-sided dovetail groove back pattern, which is formed in one step and does not require subsequent processing by a CNC engraving machine.

Description

Technical Field

[0001] The invention relates to the field of production and manufacturing of ceramic tiles, and more specifically, to a double-sided dovetail groove ceramic tile upper mold core and the manufactured ceramic tile. Background Art

[0002] In the existing ceramic tile production process, the ceramic tile blank is first formed by pressing powder with ultra-high pressure in a press, and then molded into a mold. In order to increase the bonding surface between the brick and the wall, a variety of back patterns are arranged on the back of the tile, such as long stripes, flat patterns, checkered patterns, fan-shaped patterns, random patterns and other patterns. The characteristics of these patterns are all positive demolding, that is, the ribs on the back of the brick are small at the top and large at the bottom. This style of back pattern determines that the brick is prone to falling off when it is combined with the wall. In order to reduce the risk of falling off, the depth of the back pattern can only be deepened to reduce the falling rate, but the consequence is that if the back pattern is deepened too much, the bottom of the tile will be transparent. Moreover, due to the deepening of the back pattern, during the pressing process of the press, due to the large difference in the depth of the mold, the stress at each point of the brick formed by the press is uneven, resulting in different mass densities at different places of the brick. During the sintering process of the brick, the different mass densities will result in different shrinkage rates, resulting in insufficient flatness of the tile and defective products with sintered bottom. As the depth of the back pattern of the tile increases, the rate of unqualified products will increase accordingly. Therefore, the depth of the back pattern of the tile is limited, and in practice it is usually controlled within 2 mm.

[0003] The backs of decorative tiles commonly used in the construction field are usually designed to be a relatively rough surface, or tiles with various patterns on the back with small upper edges and large lower edges. After these tiles are combined with the building surface, they come into contact with cement and other adhesives, and the bonding effect is poor. They are easy to fall off the building surface, which not only affects the use and appearance, but also the fallen tiles are very dangerous.

[0004] Later, a type of tile with a single-sided dovetail groove pattern in the four corners of the back surface appeared. Although this type of tile with a single-sided dovetail groove pattern increased the adhesion between the tile and the adhesive, because the single-sided dovetail groove only has a dovetail groove on the side of the pattern away from the center of the tile, and the pattern with the dovetail groove is only distributed in the four corners away from the center of the tile, it only has a single-sided anti-falling effect on the tile, and the adhesion is still not strong enough, and the tile falling problem has not been fundamentally solved. In addition, the existing dovetail groove back pattern tile technology also has the following disadvantages: 1. It cannot be mass-produced: low efficiency, because the pressed tile green body needs to be processed by a CNC engraving machine, and the CNC engraving machine has a slow speed in engraving the back pattern. 2. Unstable quality: Because the pressed bricks are processed by CNC during the movement of the belt roller, the bricks will vibrate during the movement, the movement is uneven, and the CNC engraving tool will vibrate during high-speed operation. The green bricks are easily damaged under the force of the belt sticks and CNC tools, and even cause the bricks to break. The damaged green bricks will have cracks and other problems during the firing process, so that the green bricks cannot form an effective dovetail groove structure after firing and cannot achieve the anti-slip effect. 3. Waste of cost: When producing a single-sided dovetail groove, special mold assembly and processing are required, which is costly. After the green bricks are pressed, they are processed by CNC engraving machines, which wastes CNC tools, CNC machine tools, and labor. 4. After the green bricks are pressed, a CNC engraving machine is added, and the cost increases accordingly. A series of equipment such as dust removal are added, and the dust is very large during CNC engraving. 5. Low efficiency: The brick output speed cannot be too fast, otherwise the CNC engraving machine cannot complete the engraving, which is time-consuming.

[0005] In order to solve the above problems, the inventors, after in-depth research and repeated experiments, cleverly utilized the stress concentration phenomenon of the rubber on the surface of the upper mold core during the pressing process of the ceramic tile blank, and developed a ceramic tile upper mold with a double-sided dovetail groove back pattern and a ceramic tile made from it. The ribs of the back pattern of the double-sided dovetail groove structured brick blank are large at the top and small at the bottom, which can effectively increase the bonding surface between the brick blank and the wall and is not easy to fall off. Compared with single-sided dovetail groove ceramic tiles, the double-sided dovetail groove provided by the present invention can prevent the entire surface of the ceramic tile blank from falling off, thereby achieving a completely anti-falling effect.

[0006] The technical solution provided by the present invention can comprehensively solve the problem of preventing tiles from falling off, and also has the following beneficial technical effects: 1. Realize mass production: Due to the use of double-sided dovetail groove molds for pressing, by adjusting the parameters of the press and the various components of the press, complete demolding is achieved after the press produces bricks, and the pressed green tiles have double-sided dovetail groove back patterns, which are formed in one time and do not require subsequent processing by a CNC engraving machine. 2. Stable quality: Since the pressed bricks do not require CNC processing procedures, there is no problem of CNC processing vibration damaging the bricks. 3. Cost savings: When producing double-sided dovetail grooves, no special mold assembly and processing is required, and the cost is low. After pressing the green tiles, it does not need to be processed by a CNC engraving machine, which not only saves the investment cost of the CNC engraving machine series equipment, but also saves the CNC tool consumption cost and labor cost. 4. High production efficiency: The brick-producing speed is fast, and bricks can be produced in multiple cavities, while the existing technology that requires subsequent processing by a CNC engraving machine cannot produce bricks in multiple cavities. Summary of the invention

[0007] In order to overcome the defects of the prior art, the present invention aims to provide a double-sided dovetail groove tile upper mold core and a finished tile, wherein the finished tile can be firmly bonded to a building surface. When the finished tile is used for building decoration, the back side is used to be bonded to the building surface, and the back side has a plurality of grooves of unequal lengths. The width of the bottom of the groove is greater than the width of the notch, and the bottom of the groove has an inclined surface in the shape of an "eight" symbol. The adhesive is allowed to enter the interior of the groove to form an adhesive hooking portion that is larger inside and smaller outside. The hooking effect can greatly enhance the bonding force between the adhesive and the tile, making the tile less likely to fall off.

[0008] To achieve the above objectives, the technical solution provided by the present invention is as follows.

[0009] A double-sided dovetail groove tile upper mold core comprises an upper mold core base 50 provided with protrusions 501 and grooves 502 and an upper mold core surface rubber 60, wherein the upper mold core surface rubber 60 is integrally formed and attached to the upper mold core base 50, thereby forming convex patterns 10 and concave patterns 20 corresponding to the protrusions 501 and the grooves 502, wherein the convex patterns 10 and the concave patterns 20 are arranged on the entire working surface of the upper mold core base 50 in an interlaced manner, wherein the width of the convex pattern top 101 of the convex pattern 10 is greater than the width of the convex pattern bottom 102, The opening width of the groove top 201 of the groove 20 is smaller than the width of the groove bottom 202. The two oblique sides 103 and 104 of the convex groove 10 form an angle α with the plane where the adjacent groove bottom 202 is located. The convex groove top 101 is provided with a recessed portion 110. The two ends of the recessed portion 110 are connected to the two oblique sides 103 and 104 of the convex groove 10 through two undercut edges 111 and 112 to form an angle β. The angles α and β are both acute angles and α>β. The recessed portion 110 extends along the entire length of the convex groove 10.

[0010] Optionally, in a double-sided dovetail groove ceramic tile upper mold core as described above, there are two or more recessed portions 110 arranged at the top 101 of the convex pattern, and a protruding ridge 113 is arranged between two adjacent recessed portions 110 , and the top of the ridge 113 is at the same horizontal plane as the top of the convex pattern 10 .

[0011] Optionally, in a double-sided dovetail groove ceramic tile upper mold core as described above, the width of the convex bottom 102 is a, and the width of the convex top 101 is b, wherein the values ​​of a and b satisfy the following relationship: 3 mm≦a≦8 mm, and 1 mm≦ba≦6 mm.

[0012] Optionally, in the double-sided dovetail groove ceramic tile upper mold core as described above, the width of the recessed portion 110 is e, and the value of e satisfies the following relationship: 0.3 mm≦e<3 mm.

[0013] Optionally, in the double-sided dovetail groove ceramic tile upper mold core as described above, the height difference between the recessed portion 110 and the top of the convex pattern 10 is c, and the value of c satisfies the following relationship: 0.1 mm≦c≦0.8 mm.

[0014] Optionally, in the double-sided dovetail groove ceramic tile upper mold core as described above, the height difference between the top of the convex pattern 10 and the bottom 202 of the concave pattern is h, and the value of h satisfies the following relationship: 0.5 mm≦h≦2 mm.

[0015] Optionally, in the double-sided dovetail groove ceramic tile upper mold core as described above, the value of the angle β satisfies the following relationship: 5 degrees ≦ β ≦ 89 degrees.

[0016] Optionally, in the double-sided dovetail groove ceramic tile upper mold core as described above, the width of the concave bottom 202 is f, and the value of f satisfies the following relationship: 3 mm≦f≦8 mm.

[0017] A double-sided dovetail groove back-patterned ceramic tile is formed by pressing a double-sided dovetail groove ceramic tile upper mold core as described above, and the entire back area of ​​the ceramic tile is distributed with double-sided dovetail groove concave patterns 1001, and two sides of the bottom of the double-sided dovetail groove concave patterns 1001 form two acute angle edges with an angle of β, and the bottom of the double-sided dovetail groove concave patterns 1001 has a protrusion 1101.

[0018] Compared with the prior art, the double-sided dovetail groove ceramic tile upper mold core and the ceramic tile made by implementing the present invention have the following beneficial effects: the upper mold core structure is simple and firm, the double-sided dovetail groove convex pattern is distributed on the entire working surface of the mold, and can be obtained by integral molding and covering the upper mold core iron matrix vulcanization molding, and double-sided dovetail groove ceramic tiles can be made without using special molds; the back groove of the made ceramic tile is a double groove with an "eight"-shaped double-sided dovetail. Compared with the aforementioned prior art, the double-sided dovetail groove of the present invention is changed by the engraving technology on the mold mother mold, breaking through the conventional processing, and the dovetail mold mother mold is engraved by a CNC engraving machine, achieving a breakthrough in demoulding technology. The produced ceramic tile has a deep back pattern and a smooth surface. The back pattern forms a double-sided dovetail groove with excellent structural strength. The back pattern can be a variety of patterns such as long stripes, checkered patterns, flat patterns, fan-shaped patterns, and random patterns; after the ceramic tile is pasted, it forms a rigid mortise and tenon structure on both sides with the adhesive layer to fully prevent the ceramic tile from falling off.

[0019] The double-sided dovetail groove ceramic tile upper mold core and the ceramic tile made by the present invention also have the following outstanding technical progress and beneficial technical effects: 1. Realization of mass production: Due to the use of double-sided dovetail groove mold pressing, by adjusting the parameters of the press and the various components of the press, complete demoulding is achieved after the press produces the brick, and the pressed ceramic tile green body has double-sided dovetail groove back lines, which is formed in one time and does not require subsequent processing by a CNC engraving machine. 2. Stable quality: Since the pressed brick blank does not require a CNC processing program, there is no problem of CNC processing vibration damaging the brick blank. 3. Cost saving: When producing double-sided dovetail grooves, no special mold assembly and processing is required, and the cost is low. After pressing the green body, it does not need to be processed by a CNC engraving machine, which not only saves the investment cost of the CNC engraving machine series equipment, but also saves the CNC tool consumption cost and labor cost. 4. High production efficiency: The brick production speed is fast, and it can produce bricks in multiple cavities, while the existing technology that requires subsequent processing by a CNC engraving machine cannot produce bricks in multiple cavities. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 The present invention is a schematic cross-sectional view of the upper mold core of a double-sided dovetail groove ceramic tile.

[0021] Figure 2 The utility model is a schematic cross-sectional view of a ceramic tile made by using the upper mold core of a double-sided dovetail groove ceramic tile provided by the present invention.

[0022] Figure 3 It is a schematic diagram of the upper mold core of the double-sided dovetail groove tile and the tile forming state provided by the present invention.

[0023] Figure 4 It is one of the planar schematic diagrams of the ceramic tile made from the upper mold core of the double-sided dovetail groove ceramic tile provided by the present invention.

[0024] Figure 5 This is the second plan schematic diagram of a ceramic tile made from a double-sided dovetail groove ceramic tile upper mold core provided by the present invention.

[0025] Figure 6 This is the third plan schematic diagram of a ceramic tile made from a double-sided dovetail groove ceramic tile upper mold core provided by the present invention.

[0026] Among them: 10-convex pattern, 101-convex pattern top, 102-convex pattern bottom, 103, 104-beveled edges, 110-recessed portion, 111, 112-undercut edges, 113-ridge, 1001-double-sided dovetail groove concave pattern, 1101-protruding portion, 20-concave pattern, 201-concave pattern top, 202-concave pattern bottom, 50-upper mold core base, 501-protrusion, 502-groove, 60-upper mold core surface rubber. DETAILED DESCRIPTION

[0027] The following is a description of the implementation of the present invention by means of specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0028] The structure, proportion, size, etc. of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no substantial technical significance. Any modification of the structure, change of the proportion relationship or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the effects and purposes that can be achieved by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. The change or adjustment of their relative relationship should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0029] The following embodiments are only for illustration purposes and can be combined with each other, and are not limited to the contents presented in the following single embodiments.

[0030] See also Figures 1 to 3A double-sided dovetail groove ceramic tile upper mold core comprises an upper mold core base 50 provided with a protrusion 501 and a groove 502 and an upper mold core surface rubber 60, wherein the upper mold core surface rubber 60 is integrally formed and attached to the upper mold core base 50, thereby forming convex patterns 10 and concave patterns 20 corresponding to the protrusions 501 and the grooves 502, wherein the convex patterns 10 and the concave patterns 20 are arranged on the upper mold core base 50 in an interlaced manner and are used to press the entire surface of the ceramic tile working surface, wherein the width of the convex pattern top 101 of the convex pattern 10 is greater than the width of the convex pattern bottom 102, and the opening width of the concave pattern top 201 of the concave pattern 20 is less than the opening width of the concave pattern bottom 20 2 width, the two oblique sides 103, 104 of the convex pattern 10 and the plane where the adjacent concave pattern bottom 202 is located form an angle, for example, for the convenience of description, let this angle be α, the convex pattern top 101 is provided with a recessed portion 110, and the two ends of the recessed portion 110 are connected to the two oblique sides 103, 104 of the convex pattern 10 through two undercut edges 111, 112 to form another angle, for example, for the convenience of description, let this angle be β; the above angles α, β are both acute angles less than 90 degrees and α>β. Of course, it can be understood that the recessed portion 110 extends along the entire length of the convex pattern 10 distributed on the upper mold core. For example, the surface rubber 60 of the upper mold core is a vulcanized rubber with a thickness of 3 mm and a hardness of 93 degrees. For example, all the concave pattern bottoms 202 can be on the same horizontal plane, and all the convex pattern tops 101 can be on another different horizontal plane.

[0031] Optionally, in the double-sided dovetail groove tile upper mold core as described above, the recessed portions 110 provided on the convex pattern top 101 may be two or more, in which case a protruding ridge 113 is provided between two adjacent recessed portions 110, and the top of the ridge 113 is on the same horizontal plane as the top of the convex pattern 10. It can be understood that the ridge 113 may extend along the entire length of the convex pattern 10 distributed on the upper mold core, or may be interrupted.

[0032] Preferably, as described above, for example, for the convenience of description, the width of the bottom 102 of the convex pattern is a, and the width of the top 101 of the convex pattern is b, wherein the values ​​of a and b satisfy the following relationship: 3 mm ≦ a ≦ 8 mm, and 1 mm ≦ ba ≦ 6 mm.

[0033] Preferably, as described above, for example, for the convenience of description, the width of the recessed portion 110 is set to e, and the value of e satisfies the following relationship: 0.3 mm≦e<3 mm.

[0034] Preferably, as described above, for example, for the convenience of description, the height difference between the recessed portion 110 and the top of the convex pattern 10 is c, and the value of c satisfies the following relationship: 0.1 mm≦c≦0.8 mm.

[0035] Preferably, as described above, for example, for the convenience of description, the height difference between the top of the convex pattern 10 and the bottom 202 of the concave pattern is assumed to be h, and the value of h satisfies the following relationship: 0.5 mm≦h≦2 mm.

[0036] Preferably, in the double-sided dovetail groove ceramic tile upper mold core as described above, the value of the angle β satisfies the following relationship: 5 degrees ≦ β ≦ 89 degrees.

[0037] Preferably, as described above, for the convenience of description, the width of the bottom 202 of the concave pattern is assumed to be f, and the value of f satisfies the following relationship: 3 mm≦f≦8 mm.

[0038] See also Figures 2 to 6 A double-sided dovetail groove back-patterned ceramic tile is pressed by a double-sided dovetail groove ceramic tile upper mold core as described above, and the entire area of ​​the ceramic tile is distributed with double-sided dovetail groove concave patterns 1001, and two sharp-angled edges with an angle of β are formed on both sides of the bottom of the double-sided dovetail groove concave patterns 1001, and the bottom of the double-sided dovetail groove concave patterns 1001 has a protrusion 1101.

[0039] According to the ceramic tile provided by the present invention, during the paving process, the double dovetail groove structure 1001 on the back of the ceramic tile allows cement slurry to enter the double dovetail groove structure 1001 through the opening of the double dovetail groove structure 1001 during cement grouting. After entering the double dovetail groove structure 1001, when it flows into the protrusion 1001, since the protrusion 1001 is higher than the bottom of the double dovetail groove structure 1001, the cement slurry can more effectively and completely enter the two corners of the bottom of the double dovetail groove structure 1001 to fill the double dovetail groove structure 1001 so as to achieve a seamless combination of the cement slurry and the ceramic tile, and can more effectively utilize the double dovetail groove structure of the double dovetail groove structure 1001 to achieve an anti-falling effect.

[0040] The height difference c between the protrusion 1001 and the bottom of the double dovetail groove 1001 determines the depth of the undercut of the double dovetail groove 1001 and the slope from the protrusion 1001 to the bottom of the double dovetail groove 1001, that is, the aforementioned angle β, thereby determining the filling speed of the cement slurry. It also cooperates with the opening width of the double dovetail groove 1001, that is, the aforementioned a value, to determine the anti-falling effect of the tile and the demolding effect of the upper mold core when the tile is formed.

[0041] By implementing the technical solution provided by the present invention, when the ceramic tile blank is pressed and formed, the ceramic tile blank is pressed and formed by the upper mold core and the lower mold core being subjected to force as a whole in the mold cavity at the same time. When pressurized, the ceramic tile blank has internal stress with the same reaction force, the upper punch magnetic plate is energized, the upper mold core is adsorbed on the upper magnetic plate, and the lower mold core is adsorbed on the assembly magnetic plate. When the upper punch descends, the high pressure of 29000KN is formed, so that the ceramic tile powder forms a brick blank in the mold cavity, and after the brick blank is formed, an "eight"-shaped double-sided dovetail groove with a small upper opening and a large lower opening is formed in the back groove. Because the bottom of the double-sided dovetail groove 1001 on the back of the brick blank has a protrusion 1101 structure, during the high-pressure pressing process, the pressure will be concentrated on both sides of the protrusion 1101. Under the action of the above-mentioned high pressure, the rubber 60 on the surface of the upper mold core will deform from the protrusion 1101 to the two corners of the bottom of the double-sided dovetail groove 1001, and the rubber layer at the two corners will become thicker. After the upper mold core loses pressure, the rubber deformation will shrink back to the state before deformation. The double-sided dovetail groove 1001 on the blank no longer matches the upper mold core convex pattern 10, and it slides from the center from the inside to the outside along the demolding slope position of the upper mold core convex pattern 10 to complete the whole set of demolding action.

[0042] It should be noted that, in this specification, relational terms such as first and second are merely used to distinguish one entity from other entities, but do not necessarily require or imply any actual relationship or order between these entities.

[0043] The above is a detailed introduction to the double-sided dovetail groove ceramic tile upper mold core and the ceramic tile produced by the present invention. This article uses specific examples to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the present invention, the present invention can also be improved and modified in a number of ways, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A double-sided dovetail groove ceramic tile upper mold core, comprising an upper mold core base (50) provided with protrusions (501) and grooves (502) and an upper mold core surface rubber (60), wherein the upper mold core surface rubber (60) is integrally formed and attached to the upper mold core base (50), thereby forming convex patterns (10) and concave patterns (20) corresponding to the protrusions (501) and grooves (502), characterized in that: The convex patterns (10) and concave patterns (20) are arranged in a mutually spaced manner on the entire working surface of the upper mold core substrate (50); the width of the convex pattern top (101) of the convex pattern (10) is greater than the width of the convex pattern bottom (102); the opening width of the concave pattern top (201) of the concave pattern (20) is less than the width of the concave pattern bottom (202); the two oblique sides (103, 104) of the convex pattern (10) and the plane where the adjacent concave pattern bottom (202) is located form an angle α; the convex pattern top (101) is provided with a recessed portion (110); the two ends of the recessed portion (110) are connected to the two oblique sides (103, 104) of the convex pattern (10) through two undercut edges (111, 112) to form an angle β; the angles α and β are both acute angles and α>β; the recessed portion (110) extends along the entire length of the convex pattern (10).

2. The double-sided dovetail groove ceramic tile upper mold core according to claim 1, characterized in that: There are two or more recessed portions (110) disposed at the top of the convex pattern (101), and a protruding ridge (113) is disposed between two adjacent recessed portions (110), wherein the top of the ridge (113) is on the same horizontal plane as the top of the convex pattern (10).

3. The double-sided dovetail groove ceramic tile upper mold core according to claim 1, characterized in that: The width of the bottom (102) of the convex pattern is a, and the width of the top (101) of the convex pattern is b, wherein the values ​​of a and b satisfy the following relationship: 3 mm ≤ a ≤ 8 mm, and 1 mm ≤ ba ≤ 6 mm.

4. The double-sided dovetail groove ceramic tile upper mold core according to claim 2, characterized in that: The width of the bottom (102) of the convex pattern is a, and the width of the top (101) of the convex pattern is b, wherein the values ​​of a and b satisfy the following relationship: 3 mm ≤ a ≤ 8 mm, and 1 mm ≤ ba ≤ 6 mm.

5. The double-sided dovetail groove ceramic tile upper mold core according to claim 1, characterized in that: The width of the recessed portion (110) is denoted by e, and the value of e satisfies the following relationship: 0.3 mm ≤ e < 3 mm.

6. The double-sided dovetail groove ceramic tile upper mold core according to claim 1, characterized in that: The height difference between the concave portion (110) and the top of the convex pattern (10) is denoted by c, and the value of c satisfies the following relationship: 0.1 mm ≤ c ≤ 0.8 mm.

7. The double-sided dovetail groove ceramic tile upper mold core according to claim 1, characterized in that: The height difference between the top of the convex pattern (10) and the bottom of the concave pattern (202) is h, and the value of h satisfies the following relationship: 0.5 mm ≤ h ≤ 2 mm.

8. A double-sided dovetail groove tile upper mold core according to any one of claims 1 to 7, characterized in that: The value of the angle β satisfies the following relationship: 5 degrees ≤ β ≤ 89 degrees.

9. A double-sided dovetail groove ceramic tile upper mold core according to any one of claims 1 to 7, characterized in that: The width of the bottom (202) of the concave pattern is f, and the value of f satisfies the following relationship: 3 mm ≤ f ≤ 8 mm.

10. A double-sided dovetail groove back pattern tile, characterized in that: It is formed by pressing a double-sided dovetail groove ceramic tile upper mold core as described in any one of claims 1 to 9, and the entire back area of ​​the ceramic tile is distributed with double-sided dovetail groove grooves (1001), and two sides of the bottom of the double-sided dovetail groove groove (1001) form two acute edges with an angle of β, and the bottom of the double-sided dovetail groove groove (1001) has a protrusion (1101).

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