Ceramic plate with dry granular phase separation glaze positioning decoration and preparation method thereof

Abstract

This invention discloses a ceramic slab with dry-granule phase-separated glaze for positioning decoration and its preparation method, belonging to the field of building materials technology. This invention precisely positions and applies high-definition transparent dry granules, semi-gloss transparent dry granules, and soft-light opaque dry granules onto the same ceramic slab surface, allowing the surface to be directly fired to produce complex decorative patterns with various optical textures. This enriches the visual effects and tactile layers of the product, and replicates the differences in gloss and transparency caused by uneven mineral distribution in natural stone. Furthermore, the boundaries of each area are formed by a mixture of adjacent dry granules and discrete points to create a gradual transition boundary, solving the technical problem of stiff and unnatural boundaries at the junctions of different effect areas. This makes the transition between different glaze effects more natural and smooth, enhancing the refinement and artistry of the decoration. Overall, the resulting dense glaze surface has superior stain resistance and corrosion resistance.

Description

Technical Field

[0001] This invention relates to the field of building materials technology, and more specifically, to a ceramic plate with dry granule phase-separated glaze for positioning decoration and its preparation method. Background Technology

[0002] The glaze decoration effect of ceramic tiles (slabs) is one of the key factors determining product quality and added value. In recent years, with the continuous improvement of consumers' aesthetic requirements for building decoration materials, ceramic products that combine rich textures and natural artistic effects have become increasingly popular in the market. Glaze decoration technology has also developed from single transparent glazes and opaque glazes to multi-textured composites. Moreover, with the improvement of living standards, people are increasingly pursuing a return to nature in home decoration styles. Therefore, in recent years, the proportion of ceramic tiles that imitate natural stone has also increased. Due to the varied rock-forming environments of natural stone, the mineral distribution inside the rock is not uniform. Therefore, there are different degrees of differences in crystallization, luster, opacity, and color at different locations on the stone surface, showing unevenness. However, currently, ceramic tile decoration is generally a single glaze covering the entire surface, and the glaze gloss, transparency, and color (before printing) are consistent. In order to imitate the effect of natural stone, a printing process is used in the later stages to print on or under the glaze to replicate the texture, pattern, and color of natural stone. Obviously, printing can only create a visual effect on the surface and cannot simulate the gloss, transparency, and color uniformity of natural stone in terms of texture, resulting in a lack of the texture of natural stone.

[0003] Dry granule decoration technology is one of the important development directions in the current ceramic tile glaze decoration. For example, Chinese patent CN103626523A discloses a ceramic tile with a dry granule glaze decorative surface and its manufacturing method. This method achieves a dry granule decorative effect by applying a dry granule glaze layer to the surface of the ceramic tile body and firing it. While this technology realizes the decorative application of dry granule glaze, the dry granule glaze used is a single-component glaze system, which cannot achieve the coexistence and combination of multiple textures such as transparent, semi-transparent, and opaque within the same glaze surface, limiting the layering and richness of the decorative effect. Furthermore, the traditional glazing method used in this patent makes it difficult to accurately position the dry granules in specific areas of the tile surface, resulting in insufficient flexibility in pattern presentation. Another example is Chinese patent CN110054414B, which discloses a mixed dry granule glaze decorative ceramic tile with a colored crystal effect and its preparation method. This method achieves a colored crystal effect by mixing colored and transparent dry granules in a specific ratio and controlling the difference in their softening temperatures. While this technical solution incorporates the mixed use of various dry granules, these granules are uniformly mixed and applied across the entire glaze surface. The different granules are randomly distributed rather than positioned according to a designed pattern, making it impossible to achieve the decorative effect of precisely dividing transparent, semi-transparent, and opaque areas according to the pattern requirements. Furthermore, the different granules melt and mix during firing, making it difficult to maintain their individual texture characteristics. Moreover, in existing technologies, when applying different granules to create different texture effects, the lack of boundary gradation between different glaze areas results in obvious, harsh, and unnatural boundary lines, failing to achieve the desired decorative artistic effect. Summary of the Invention

[0004] Based on this, to solve one of the aforementioned technical problems, this application, based on the SiO2-Al2O3-CaO ternary phase diagram, develops high-definition transparent glaze, semi-gloss transparent glaze, and soft-light opaque glaze in the calcium feldspar phase region, pseudo-wollastonite phase region, and calcium feldspar phase region, respectively. This allows the three glazes to form a blended but non-eutectic phase-separated system at a firing temperature of 1200-1220℃. Simultaneously, this application utilizes an inkjet printing and belt-driven fabric-laying linkage mechanism to achieve precise positioning and application of the three phase-separated glaze dry particles on the brick surface; and through digital line fabrication technology and boundary discrete gradient transition technology, it eliminates rigid boundaries between different glaze regions, resulting in a natural pattern transition. Based on this, the present invention provides a ceramic slab with dry particle phase-separated glaze positioning decoration and its preparation method, the specific technical solution of which is as follows: A ceramic slab with dry-granule phase-separated glaze positioning decoration, the ceramic slab includes a body layer, a base glaze layer covering the body layer, a top glaze layer covering the base glaze layer, a pattern layer covering the top glaze layer, and a phase-separated glaze layer covering the pattern layer, wherein the phase-separated glaze layer has a structure in which high-definition transparent glaze area, semi-gloss transparent glaze area and soft-light opaque glaze area are arranged in a preset pattern, and the adjacent areas form a gradual transition boundary through discrete points; The high-definition transparent glaze area is formed by firing high-definition transparent glaze dry particles; the semi-gloss transparent glaze area is formed by firing semi-gloss transparent glaze dry particles; the soft-light opaque glaze area is formed by firing soft-light opaque glaze dry particles; and the gradient transition boundary is formed by firing a mixture of two adjacent dry particles. The high-definition transparent glaze dry granules comprise the following chemical composition by weight percentage: SiO2 40~42.0%, Al2O3 8.2~8.5%, B2O3 6.8~7.0%, CaO 18.0~19.0%, MgO 6.5~7.2%, ZnO 7.0~7.5%, BaO 2.5~3.0%, K2O 4.0~4.5%, Na2O 2.3~2.5%, Li2O 1.5~2.0%, and loss on ignition 0.5~5%. The semi-transparent glaze dry granules comprise the following chemical composition by weight percentage: SiO2 55.0~56.0%, Al2O3 8.0~8.5%, B2O3 6.0~6.5%, CaO 10.0~12.5%, MgO 3.0~4.0%, ZnO 3.0~4.0%, K2O 7.5~8.5%, Na2O 3.0~3.5%, Li2O 0.5~1.0%, CeO2 1.0~1.5%, and loss on ignition 0.5~5%. The soft-light opaque glaze dry granules contain the following chemical composition by weight percentage: SiO2 55~58.0%, Al2O3 12.0~13.0%, B2O3 5.5~6.0%, CaO 8.9~9.0%, MgO 2.6~3.0%, K2O 3.5~4.5%, Na2O 2.0~2.5%, CeO2 0.5~1.0%, ZrO2 5.0~6.0%, and loss on ignition 0.5~5%.

[0005] Furthermore, the adaptable temperature range for the high-definition transparent glaze dry granules is 1160~1220℃, and the coefficient of thermal expansion is (6.0~6.2)×10⁻⁶. -6 / ℃; the suitable temperature range for the semi-gloss transparent glaze dry granules is 1165~1220℃, and the coefficient of thermal expansion is (5.5~5.8)×10. -6 / ℃; the suitable temperature range for the dry granules of the soft-light opaque glaze is 1180~1220℃, and the coefficient of thermal expansion is (5.5~5.8)×10. -6 / ℃.

[0006] Further, the dry granule mixture of the two adjacent dry granules includes: a dry granule mixture A formed by mixing the high-definition transparent glaze dry granules and the semi-gloss transparent glaze dry granules in a mass ratio of 1:1; a dry granule mixture B formed by mixing the semi-gloss transparent glaze dry granules and the soft-light opaque glaze dry granules in a mass ratio of 1:1; and a dry granule mixture C formed by mixing the high-definition transparent glaze dry granules and the soft-light opaque glaze dry granules in a mass ratio of 1:1.

[0007] Furthermore, the particle size of the high-definition transparent glaze dry particles, the semi-gloss transparent glaze dry particles, and the soft-light opaque glaze dry particles are all ≤1.0mm; the application rate is 1.68~1.72g / cm³. 3 .

[0008] In addition, the present invention also provides a method for preparing a ceramic slab with dry granule phase-separated glaze positioning decoration, the preparation method comprising the following steps: S1. Apply a base glaze to the body layer to form a base glaze layer; S2. Apply a top glaze to the base glaze layer to form a top glaze layer; S3. The patterns of various products to be produced are compiled into a program format and pre-stored in the central operating system. After the operator confirms the product type, the system automatically retrieves the corresponding product program and sends the color separation layer to each inkjet printing station with printing instructions. Each inkjet printing station prints glue according to the order and designated area specified by the operation program to form the pattern layer. S4. Using a belt-driven cloth feeding machine, high-definition transparent glaze dry granules are applied to the high-definition transparent glaze area, semi-gloss transparent glaze dry granules are applied to the semi-gloss transparent glaze area, and soft-light opaque glaze dry granules are applied to the soft-light opaque glaze area. Then, a digital line cloth feeding process is used, through a multi-stage belt-driven cloth feeding machine, pre-set lines that match the shape of the area boundary are formed on the terminal belt, and the corresponding dry granule mixture is applied. The boundary is gradually transitioned through discrete points. After drying, firing and cooling, a ceramic plate with dry granule phase-separated glaze positioning decoration is obtained.

[0009] Further, in step S1, the base glaze is a white, opaque glaze, and the density of the base glaze slurry is 1.80~1.82 g / cm³. 3 The glaze application amount is 500~510g / m² 2 .

[0010] Furthermore, in step S2, the surface glaze is a semi-opaque glaze, and the density of the glaze slurry is 1.78~1.80 g / cm³. 3 The glaze application rate is 450~480g / m². 2 .

[0011] Furthermore, in step S4, the specific method for forming a gradual transition boundary through discrete points is as follows: (4a) A dry granule mixture formed by mixing the high-definition transparent glaze dry granules and the semi-gloss transparent glaze dry granules in a mass ratio of 1:1; B dry granule mixture formed by mixing the semi-gloss transparent glaze dry granules and the soft-light opaque glaze dry granules in a mass ratio of 1:1; C dry granule mixture formed by mixing the high-definition transparent glaze dry granules and the soft-light opaque glaze dry granules in a mass ratio of 1:1. (4b) Using digital line fabrication technology, a pre-set line matching the shape of the area boundary is formed on the terminal belt by a multi-stage belt fabrication machine. Dry granule mixture A is applied at the boundary position of the high-definition transparent glaze area and the semi-gloss transparent glaze area; dry granule mixture B is applied at the boundary position of the semi-gloss transparent glaze area and the soft light opaque glaze area; and dry granule mixture C is applied at the boundary position of the high-definition transparent glaze area and the soft light opaque glaze area. (4c) After the dry granule mixture is applied, the scraper will level the dry granule mixture at the boundary position so that it is level with the high-definition transparent glaze area, the semi-gloss transparent glaze area and the soft-light opaque glaze area.

[0012] Furthermore, in step S4, the drying temperature is 60~80℃ and the drying time is 10~15min.

[0013] Furthermore, in step S4, the firing temperature is 1200~1220℃, and the holding time is 10~20min; The cooling process includes a rapid cooling section and a slow cooling section. The rapid cooling section cools the temperature from 1200~1220℃ to 600~650℃ in 3~8 minutes. The slow cooling section cools the temperature from 600~650℃ to room temperature in 20~40 minutes.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. This invention precisely positions and applies three types of high-definition transparent dry granules, semi-glossy transparent dry granules, and soft-light opaque dry granules with different optical effects onto the same ceramic slab surface. This creates areas with varying gloss and texture on the product surface, arranged according to a preset pattern. This allows the ceramic slab surface to be directly fired to produce complex decorative patterns with multiple optical textures, enriching the product's visual effects and tactile layers, and replicating the gloss and transparency differences in natural stone caused by uneven mineral distribution. Furthermore, the boundaries of each area are formed by a mixture of adjacent dry granules and discrete points to create a gradual transition boundary. This solves the technical problem of stiff and unnatural boundaries at the junctions of different effect areas, making the transitions between different glaze effects more natural and smooth, enhancing the refinement and artistry of the decoration, and achieving the artistic decorative effect of natural stone.

[0015] 2. The optimized high-definition transparent dry granules, semi-transparent dry granules, and soft-light opaque dry granules of this invention have matching firing temperature and expansion coefficient, which can effectively avoid cracking and peeling problems caused by thermal stress mismatch between different material layers, and improve the thermal stability and crack resistance of the product.

[0016] 3. This invention optimizes the chemical composition of high-definition transparent dry granules, with higher levels of CaO, MgO, ZnO, and Li2O, and a moderate SiO2 / Al2O3 ratio, which helps to form a glassy phase with high refractive index and high transparency. Simultaneously, Li2O and B2O3 lower the melting temperature, ensuring a bright and smooth glaze surface and contributing to improved transparency. In semi-glossy transparent dry granules, CeO2 is introduced as a clarifying and whitening agent, and the alkali metal content is adjusted to achieve a moderate glaze gloss and a warm, smooth texture. Furthermore, by adjusting the K2O content, microcrystalline white garnet can be formed. Combined with CeO2 as an opacifier to control transparency, a soft-light effect is achieved. In soft-light opacified dry granules, ZrO2 and CeO2 are introduced, causing the precipitation of fine zircon crystals during firing, producing a stable opacified and soft-light effect while simultaneously improving corrosion resistance.

[0017] 4. This invention optimizes the cooling process, ensuring that all glaze layers complete their respective crystallization during high-temperature firing. The rapid cooling section quickly controls melt solidification, inhibiting further coarsening of crystals formed at high temperatures and effectively preventing crystallization and devitrification in the high-definition transparent glaze area. The slow cooling section provides sufficient time for the body and each glaze layer to relax elastically, gradually releasing compressive or tensile stresses caused by asynchronous thermal contraction, reducing cracking. Simultaneously, it helps promote a smoother and more delicate glaze surface, ensuring the artistic decorative effect on the ceramic slab surface while also forming a dense glaze surface with superior stain resistance and corrosion resistance. Attached Figure Description

[0018] The invention will be further understood from the following description taken in conjunction with the accompanying drawings. The components in the drawings are not necessarily drawn to scale, but rather the emphasis is on illustrating the principles of the embodiments. In different views, the same reference numerals designate corresponding parts.

[0019] Figure 1 This is a schematic diagram of the ceramic plate product prepared in Example 1 of the present invention; Figure 2 This is a schematic diagram of the application of high-definition transparent glaze dry granules, semi-gloss transparent glaze dry granules, and soft-light opaque glaze dry granules using a belt conveyor in Embodiment 1 of the present invention. Figure 3 This is a schematic diagram of the application of a corresponding dry granular mixture on a pre-set line that matches the shape of the region boundary on the terminal belt, as described in Embodiment 1 of the present invention.

[0020] Explanation of reference numerals in the attached drawings: 1-body layer; 2-base glaze layer; 3-top glaze layer; 4-high-definition transparent glaze area; 5-semi-gloss transparent glaze area; 6-soft-gloss opaque glaze area; 7-boundary between the high-definition transparent glaze area and the semi-gloss transparent glaze area; 8-boundary between the semi-gloss transparent glaze area and the soft-gloss opaque glaze area; 9-dry granule mixture A; 10-dry granule mixture B. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to its embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the scope of protection of the invention.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0023] A ceramic slab with dry granule phase-separated glaze positioning decoration according to one embodiment of the present invention includes a body layer, a base glaze layer covering the body layer, a top glaze layer covering the base glaze layer, a pattern layer covering the top glaze layer, and a phase-separated glaze layer covering the pattern layer. The phase-separated glaze layer has a structure in which high-definition transparent glaze area, semi-gloss transparent glaze area and soft-light opaque glaze area are arranged in a preset pattern, and the adjacent areas form a gradual transition boundary through discrete points. The high-definition transparent glaze area is formed by firing high-definition transparent glaze dry particles; the semi-gloss transparent glaze area is formed by firing semi-gloss transparent glaze dry particles; the soft-light opaque glaze area is formed by firing soft-light opaque glaze dry particles; and the gradient transition boundary is formed by firing a mixture of two adjacent dry particles. The high-definition transparent glaze dry granules comprise the following chemical composition by weight percentage: SiO2 40~42.0%, Al2O3 8.2~8.5%, B2O3 6.8~7.0%, CaO 18.0~19.0%, MgO 6.5~7.2%, ZnO 7.0~7.5%, BaO 2.5~3.0%, K2O 4.0~4.5%, Na2O 2.3~2.5%, Li2O 1.5~2.0%, and loss on ignition 0.5~5%. The semi-transparent glaze dry granules comprise the following chemical composition by weight percentage: SiO2 55.0~56.0%, Al2O3 8.0~8.5%, B2O3 6.0~6.5%, CaO 10.0~12.5%, MgO 3.0~4.0%, ZnO 3.0~4.0%, K2O 7.5~8.5%, Na2O 3.0~3.5%, Li2O 0.5~1.0%, CeO2 1.0~1.5%, and loss on ignition 0.5~5%. The soft-light opaque glaze dry granules contain the following chemical composition by weight percentage: SiO2 55~58.0%, Al2O3 12.0~13.0%, B2O3 5.5~6.0%, CaO 8.9~9.0%, MgO 2.6~3.0%, K2O 3.5~4.5%, Na2O 2.0~2.5%, CeO2 0.5~1.0%, ZrO2 5.0~6.0%, and loss on ignition 0.5~5%.

[0024] In one embodiment, the high-definition transparent glaze dry granules are suitable for temperatures of 1160~1220℃ and have a coefficient of thermal expansion of (6.0~6.2)×10⁻⁶. -6 / ℃; the suitable temperature range for the semi-gloss transparent glaze dry granules is 1165~1220℃, and the coefficient of thermal expansion is (5.5~5.8)×10. -6 / ℃; the suitable temperature range for the dry granules of the soft-light opaque glaze is 1180~1220℃, and the coefficient of thermal expansion is (5.5~5.8)×10. -6 / ℃.

[0025] In one embodiment, the dry granule mixture of the two adjacent dry granules includes: a dry granule mixture A formed by mixing the high-definition transparent glaze dry granules and the semi-gloss transparent glaze dry granules in a mass ratio of 1:1; a dry granule mixture B formed by mixing the semi-gloss transparent glaze dry granules and the soft-light opaque glaze dry granules in a mass ratio of 1:1; and a dry granule mixture C formed by mixing the high-definition transparent glaze dry granules and the soft-light opaque glaze dry granules in a mass ratio of 1:1.

[0026] In one embodiment, the particle size of the high-definition transparent glaze dry particles, the semi-gloss transparent glaze dry particles, and the soft-light opaque glaze dry particles are all ≤1.0mm; the application rate is 1.68~1.72g / cm³. 3 .

[0027] In addition, the present invention also provides a method for preparing a ceramic slab with dry granule phase-separated glaze positioning decoration, the preparation method comprising the following steps: S1. Apply a base glaze to the body layer to form a base glaze layer; S2. Apply a top glaze to the base glaze layer to form a top glaze layer; S3. The patterns of various products to be produced are compiled into a program format and pre-stored in the central operating system. After the operator confirms the product type, the system automatically retrieves the corresponding product program and sends the color separation layer to each inkjet printing station with printing instructions. Each inkjet printing station prints glue according to the order and designated area specified by the operation program to form the pattern layer. S4. Using a belt-driven cloth feeding machine, high-definition transparent glaze dry granules are applied to the high-definition transparent glaze area, semi-gloss transparent glaze dry granules are applied to the semi-gloss transparent glaze area, and soft-light opaque glaze dry granules are applied to the soft-light opaque glaze area. Then, a digital line cloth feeding process is used, through a multi-stage belt-driven cloth feeding machine, pre-set lines that match the shape of the area boundary are formed on the terminal belt, and the corresponding dry granule mixture is applied. The boundary is gradually transitioned through discrete points. After drying, firing and cooling, a ceramic plate with dry granule phase-separated glaze positioning decoration is obtained.

[0028] In one embodiment, in step S1, the base glaze is a white, opaque glaze, and the density of the base glaze slurry is 1.80~1.82 g / cm³. 3 The glaze application amount is 500~510g / m² 2 The base glaze used in this invention is simply a white, opaque glaze, which serves to cover the color of the body; details will not be elaborated upon here.

[0029] In one embodiment, in step S2, the surface glaze is a semi-opaque glaze, and the density of the glaze slurry is 1.78~1.80 g / cm³. 3 The glaze application rate is 450~480g / m². 2 .

[0030] In one embodiment, the surface glaze comprises the following raw materials in parts by weight: 10-15 parts potassium feldspar, 8-12 parts sodium feldspar, 8-12 parts calcined kaolin, 5-8 parts clay, 3-5 parts zirconium silicate, 10-15 parts quartz powder, 1-3 parts dolomite, 1-3 parts zinc oxide, 1-2 parts dispersant, and 30-50 parts water.

[0031] In one embodiment, the dispersant is at least one of sodium tripolyphosphate and sodium hexapometaphosphate.

[0032] In one embodiment, the preparation method of the surface glaze is as follows: the raw materials for the surface glaze are added to a ball mill, an appropriate amount of water is added for wet ball milling, and the fineness of the ball milling is controlled to be ≤0.5% residue on a 325-mesh sieve. Then, iron removal is performed by a magnetic separator, and the glaze is then aged in a storage tank for 24-48 hours to obtain the surface glaze. After the surface glaze formula of the present invention is optimized, it can form a soft and uniform opaque effect, which can further cover the color of the body. Moreover, the glaze spreads fully during firing, achieving high smoothness and high gloss, and exhibiting excellent thermal stability and resistance to cracking in the later stage of firing.

[0033] In one embodiment, the specific method for forming a boundary gradient transition boundary through discrete points in step S4 is as follows: (4a) A dry granule mixture formed by mixing the high-definition transparent glaze dry granules and the semi-gloss transparent glaze dry granules in a mass ratio of 1:1; B dry granule mixture formed by mixing the semi-gloss transparent glaze dry granules and the soft-light opaque glaze dry granules in a mass ratio of 1:1; C dry granule mixture formed by mixing the high-definition transparent glaze dry granules and the soft-light opaque glaze dry granules in a mass ratio of 1:1. (4b) Using digital line fabrication technology, a pre-set line matching the shape of the area boundary is formed on the terminal belt by a multi-stage belt fabrication machine. Dry granule mixture A is applied at the boundary position of the high-definition transparent glaze area and the semi-gloss transparent glaze area; dry granule mixture B is applied at the boundary position of the semi-gloss transparent glaze area and the soft light opaque glaze area; and dry granule mixture C is applied at the boundary position of the high-definition transparent glaze area and the soft light opaque glaze area. (4c) After the dry granule mixture is applied, the scraper will level the dry granule mixture at the boundary position so that it is level with the high-definition transparent glaze area, the semi-gloss transparent glaze area and the soft-light opaque glaze area.

[0034] In one embodiment, in step S4, the drying temperature is 60~80℃ and the drying time is 10~15min.

[0035] In one embodiment, in step S4, the firing temperature is 1200~1220℃, and the holding time is 10~20min; The cooling process includes a rapid cooling section and a slow cooling section. The rapid cooling section cools the temperature from 1200~1220℃ to 600~650℃ in 3~8 minutes. The slow cooling section cools the temperature from 600~650℃ to room temperature in 20~40 minutes.

[0036] The above solution precisely positions and applies three types of high-definition transparent dry granules, semi-transparent dry granules, and soft-light opaque dry granules with different optical effects on the same ceramic slab surface. Combined with discrete point gradient boundary technology, it achieves the gloss and transparency differences of natural stone, solving the problem of rigid texture and lack of layering in traditional ceramic tiles. At the same time, the synergistic matching of the three types of dry granules in terms of chemical composition, firing temperature, and expansion coefficient, as well as the optimized cooling process, ensures the thermal stability and crack resistance of the product, ultimately forming a ceramic slab that combines artistic decorative effect, delicate touch, and excellent stain and corrosion resistance.

[0037] The embodiments of the present invention will be described in detail below with reference to specific examples. Components and processes not specified herein are considered conventional techniques and will not be elaborated upon here. Example 1:

[0038] In this embodiment, the high-definition transparent glaze dry granules comprise the following chemical composition by mass percentage: SiO2 42.0%, Al2O3 8.2%, B2O3 6.8%, CaO 18.0%, MgO 6.8%, ZnO 7.3%, BaO 2.6%, K2O 4.0%, Na2O 2.3%, Li2O 1.5%, and loss on ignition 0.5%. The adaptable temperature of the high-definition transparent glaze dry granules is 1180℃, and the coefficient of thermal expansion is 6.2 × 10⁻⁶. -6 / ℃; particle size 0.8mm, application rate 1.71g / cm³ 3 ; The semi-gloss transparent glaze dry granules contain the following chemical composition by weight percentage: SiO2 55.0%, Al2O3 8.0%, B2O3 6.0%, CaO 12.1%, MgO 3.1%, ZnO 3.2%, K2O 7.5%, Na2O 3.1%, Li2O 0.5%, CeO2 1.0%, and loss on ignition 0.5%. The suitable operating temperature for the semi-gloss transparent glaze dry granules is 1185℃, and the coefficient of thermal expansion is 5.8 × 10⁻⁶. -6 / ℃; particle size 0.8mm, application rate 1.71g / cm³ 3 ; The soft-light opaque glaze dry granules contain the following chemical composition by weight percentage: SiO2 58.0%, Al2O3 12.5%, B2O3 5.5%, CaO 8.9%, MgO 2.6%, K2O 4.1%, Na2O 2.3%, CeO2 0.5%, ZrO2 5.1%, and loss on ignition 0.5%. The suitable operating temperature for these soft-light opaque glaze dry granules is 1200℃, and the coefficient of thermal expansion is 5.6 × 10⁻⁶. -6 / ℃; particle size 0.8mm, application rate 1.71g / cm³ 3 ; A method for preparing a ceramic slab with dry-granule phase-separated glaze for positioning and decoration, the method comprising the following steps: S1. Apply a base glaze to the body layer. The base glaze is a white, opaque glaze with a glaze slurry density of 1.82 g / cm³. 3 Glazing amount is 500g / m 2 This forms the base glaze layer; S2. Apply a top glaze to the base glaze layer, wherein the top glaze is a semi-opaque glaze and the density of the top glaze slurry is 1.78 g / cm³. 3 Glazing amount is 460g / m 2 This forms a surface glaze layer; The preparation method of the surface glaze is as follows: by weight, 12 parts potassium feldspar, 8 parts sodium feldspar, 10 parts calcined kaolin, 5 parts ball clay, 5 parts zirconium silicate, 12 parts quartz powder, 2 parts dolomite, 2 parts zinc oxide and 1 part sodium hexapolyphosphate are added to a ball mill, 45 parts water are added for wet ball milling, and the ball milling fineness is controlled to ≤0.5% residue on a 325 mesh sieve. Then, iron removal is performed by magnetic separator, and then the glaze is aged in a storage tank for 24 hours to obtain the surface glaze. S3. The patterns of various products to be produced are compiled into a program format and pre-stored in the central operating system. After the operator confirms the product type, the system automatically retrieves the corresponding product program and sends the color separation layer to each inkjet printing station with printing instructions. Each inkjet printing station prints glue according to the order and designated area specified by the operation program to form the pattern layer. The specific method for forming a gradual transition boundary through discrete points is as follows: (4a) A dry granule mixture formed by mixing the high-definition transparent glaze dry granules and the semi-gloss transparent glaze dry granules in a mass ratio of 1:1; B dry granule mixture formed by mixing the semi-gloss transparent glaze dry granules and the soft-light opaque glaze dry granules in a mass ratio of 1:1; C dry granule mixture formed by mixing the high-definition transparent glaze dry granules and the soft-light opaque glaze dry granules in a mass ratio of 1:1. (4b) Using digital line fabrication technology, a pre-set line matching the shape of the area boundary is formed on the terminal belt by a multi-stage belt fabrication machine. Dry granule mixture A is applied at the boundary position of the high-definition transparent glaze area and the semi-gloss transparent glaze area; dry granule mixture B is applied at the boundary position of the semi-gloss transparent glaze area and the soft light opaque glaze area; and dry granule mixture C is applied at the boundary position of the high-definition transparent glaze area and the soft light opaque glaze area. (4c) After the dry granule mixture is applied, the scraper will level the dry granule mixture at the boundary position so that it is level with the high-definition transparent glaze area, the semi-gloss transparent glaze area and the soft-light opaque glaze area. S4. Using a belt-driven cloth feeding machine, high-definition transparent glaze dry granules are applied to the high-definition transparent glaze area, semi-gloss transparent glaze dry granules are applied to the semi-gloss transparent glaze area, and soft-light opaque glaze dry granules are applied to the soft-light opaque glaze area. Then, a digital line cloth feeding process is used, with a multi-stage belt-driven cloth feeding machine forming pre-set lines on the terminal belt that match the shape of the area boundary. The corresponding dry granule mixture is applied, and the boundary is gradually transitioned through discrete points. The mixture is dried at 75°C for 15 minutes, then fired at 1220°C for 20 minutes, and then cooled. The cooling process includes a rapid cooling section and a slow cooling section. The rapid cooling section reduces the temperature from 1220°C to 650°C in 5 minutes, and the slow cooling section reduces the temperature from 650°C to room temperature in 30 minutes, resulting in a ceramic plate with dry granule phase-separated glaze positioning decoration. Example 2:

[0039] In this embodiment, the high-definition transparent glaze dry granules comprise the following chemical composition by mass percentage: SiO2 42.0%, Al2O3 8.2%, B2O3 6.8%, CaO 18.0%, MgO 7.0%, ZnO 7.2%, BaO 2.5%, K2O 4.0%, Na2O 2.3%, Li2O 1.5%, and loss on ignition 0.5%. The adaptable temperature of the high-definition transparent glaze dry granules is 1185℃, and the coefficient of thermal expansion is 6.1 × 10⁻⁶. -6 / ℃; particle size 0.8mm, application rate 1.71g / cm³ 3 ; The semi-gloss transparent glaze dry granules contain the following chemical composition by weight percentage: SiO2 55.0%, Al2O3 8.0%, B2O3 6.0%, CaO 12.0%, MgO 3.1%, ZnO 3.0%, K2O 7.8%, Na2O 3.1%, Li2O 0.5%, CeO2 1.0%, and loss on ignition 0.5%. The suitable operating temperature for the semi-gloss transparent glaze dry granules is 1185℃, and the coefficient of thermal expansion is 5.8 × 10⁻⁶. -6 / ℃; particle size 0.8mm, application rate 1.71g / cm³ 3 ; The soft-light opaque glaze dry granules contain the following chemical composition by weight percentage: SiO2 58.0%, Al2O3 12.6%, B2O3 5.8%, CaO 9.0%, MgO 2.7%, K2O 3.9%, Na2O 2.1%, CeO2 0.5%, ZrO2 4.9%, and loss on ignition 0.5%. The suitable operating temperature for these soft-light opaque glaze dry granules is 1200℃, and the coefficient of thermal expansion is 5.7 × 10⁻⁶. -6 / ℃; particle size 0.8mm, application rate 1.71g / cm³ 3 ; A method for preparing a ceramic slab with dry-granule phase-separated glaze for positioning and decoration, the method comprising the following steps: S1. Apply a base glaze to the body layer. The base glaze is a white, opaque glaze with a glaze slurry density of 1.82 g / cm³. 3 Glazing amount is 500g / m 2 This forms the base glaze layer; S2. Apply a top glaze to the base glaze layer, wherein the top glaze is a semi-opaque glaze and the density of the top glaze slurry is 1.790 g / cm³. 3 Glazing amount is 460g / m 2 This forms a surface glaze layer; The preparation method of the surface glaze is as follows: 11 parts by weight of potassium feldspar, 9 parts by weight of sodium feldspar, 12 parts by weight of calcined kaolin, 5 parts by weight of ball clay, 4 parts by weight of zirconium silicate, 11 parts by weight of quartz powder, 3 parts by weight of dolomite, 2 parts by weight of zinc oxide and 1 part by weight of sodium hexapolymetaphosphate are added to a ball mill, 45 parts by weight of water are added for wet ball milling, and the ball milling fineness is controlled to ≤0.5% of the residue on a 325 mesh sieve. Then, the glaze is removed by magnetic separation and then aged in a storage tank for 24 hours to obtain the surface glaze. S3. The patterns of various products to be produced are compiled into a program format and pre-stored in the central operating system. After the operator confirms the product type, the system automatically retrieves the corresponding product program and sends the color separation layer to each inkjet printing station with printing instructions. Each inkjet printing station prints glue according to the order and designated area specified by the operation program to form the pattern layer. The specific method for forming a gradual transition boundary through discrete points is as follows: (4a) A dry granule mixture formed by mixing the high-definition transparent glaze dry granules and the semi-gloss transparent glaze dry granules in a mass ratio of 1:1; B dry granule mixture formed by mixing the semi-gloss transparent glaze dry granules and the soft-light opaque glaze dry granules in a mass ratio of 1:1; C dry granule mixture formed by mixing the high-definition transparent glaze dry granules and the soft-light opaque glaze dry granules in a mass ratio of 1:1. (4b) Using digital line fabrication technology, a pre-set line matching the shape of the area boundary is formed on the terminal belt by a multi-stage belt fabrication machine. Dry granule mixture A is applied at the boundary position of the high-definition transparent glaze area and the semi-gloss transparent glaze area; dry granule mixture B is applied at the boundary position of the semi-gloss transparent glaze area and the soft light opaque glaze area; and dry granule mixture C is applied at the boundary position of the high-definition transparent glaze area and the soft light opaque glaze area. (4c) After the dry granule mixture is applied, the scraper will level the dry granule mixture at the boundary position so that it is level with the high-definition transparent glaze area, the semi-gloss transparent glaze area and the soft-light opaque glaze area. S4. Using a belt-driven cloth feeding machine, high-definition transparent glaze dry granules are applied to the high-definition transparent glaze area, semi-gloss transparent glaze dry granules are applied to the semi-gloss transparent glaze area, and soft-light opaque glaze dry granules are applied to the soft-light opaque glaze area. Then, a digital line cloth feeding process is used, with a multi-stage belt-driven cloth feeding machine forming pre-set lines on the terminal belt that match the shape of the area boundary. The corresponding dry granule mixture is applied, and a boundary gradient transition boundary is formed through discrete points. The mixture is dried at 75°C for 15 minutes, then fired at 1220°C for 20 minutes, and then cooled. The cooling process includes a rapid cooling section and a slow cooling section. The rapid cooling section reduces the temperature from 1220°C to 620°C in 6 minutes, and the slow cooling section reduces the temperature from 620°C to room temperature in 25 minutes, resulting in a ceramic plate with dry granule phase-separated glaze positioning decoration. Example 3:

[0040] In this embodiment, the high-definition transparent glaze dry granules comprise the following chemical composition by mass percentage: SiO2 42.0%, Al2O3 8.2%, B2O3 6.8%, CaO 18.0%, MgO 6.9%, ZnO 7.3%, BaO 2.5%, K2O 4.0%, Na2O 2.3%, Li2O 1.5%, and loss on ignition 0.5%. The adaptable temperature of the high-definition transparent glaze dry granules is 1180℃, and the coefficient of thermal expansion is 6.1 × 10⁻⁶. -6 / ℃; particle size 0.8mm, application rate 1.71g / cm³ 3 ; The semi-gloss transparent glaze dry granules contain the following chemical composition by weight percentage: SiO2 55.0%, Al2O3 8.0%, B2O3 6.0%, CaO 12.0%, MgO 3.1%, ZnO 3.0%, K2O 7.8%, Na2O 3.1%, Li2O 0.5%, CeO2 1.0%, and loss on ignition 0.5%. The suitable operating temperature for the semi-gloss transparent glaze dry granules is 1185℃, and the coefficient of thermal expansion is 5.8 × 10⁻⁶. -6 / ℃; particle size 0.8mm, application rate 1.71g / cm³ 3 ; The soft-light opaque glaze dry granules contain the following chemical composition by weight percentage: SiO2 58.0%, Al2O3 12.5%, B2O3 5.5%, CaO 8.9%, MgO 2.6%, K2O 4.4%, Na2O 2.1%, CeO2 0.5%, ZrO2 5.0%, and loss on ignition 0.5%. The suitable operating temperature for these soft-light opaque glaze dry granules is 1200℃, and the coefficient of thermal expansion is 5.8 × 10⁻⁶. -6 / ℃; particle size 0.8mm, application rate 1.71g / cm³ 3 ; A method for preparing a ceramic slab with dry-granule phase-separated glaze for positioning and decoration, the method comprising the following steps: S1. Apply a base glaze to the body layer. The base glaze is a white, opaque glaze with a glaze slurry density of 1.82 g / cm³. 3 Glazing amount is 500g / m 2 This forms the base glaze layer; S2. Apply a top glaze to the base glaze layer, wherein the top glaze is a semi-opaque glaze and the density of the glaze slurry is 1.80 g / cm³. 3 Glazing amount is 460g / m 2 This forms a surface glaze layer; The preparation method of the surface glaze is as follows: 10 parts by weight of potassium feldspar, 10 parts by weight of sodium feldspar, 12 parts by weight of calcined kaolin, 6 parts by weight of ball clay, 5 parts by weight of zirconium silicate, 10 parts by weight of quartz powder, 3 parts by weight of dolomite, 2 parts by weight of zinc oxide and 1 part by weight of sodium hexapolyphosphate are added to a ball mill, 45 parts by weight of water are added for wet ball milling, and the fineness of the ball milling is controlled to be ≤0.5% on a 325-mesh sieve. Then, the glaze is removed by magnetic separation and then aged in a storage tank for 24 hours to obtain the surface glaze. S3. The patterns of various products to be produced are compiled into a program format and pre-stored in the central operating system. After the operator confirms the product type, the system automatically retrieves the corresponding product program and sends the color separation layer to each inkjet printing station with printing instructions. Each inkjet printing station prints glue according to the order and designated area specified by the operation program to form the pattern layer. The specific method for forming a gradual transition boundary through discrete points is as follows: (4a) A dry granule mixture formed by mixing the high-definition transparent glaze dry granules and the semi-gloss transparent glaze dry granules in a mass ratio of 1:1; B dry granule mixture formed by mixing the semi-gloss transparent glaze dry granules and the soft-light opaque glaze dry granules in a mass ratio of 1:1; C dry granule mixture formed by mixing the high-definition transparent glaze dry granules and the soft-light opaque glaze dry granules in a mass ratio of 1:1. (4b) Using digital line fabrication technology, a pre-set line matching the shape of the area boundary is formed on the terminal belt by a multi-stage belt fabrication machine. Dry granule mixture A is applied at the boundary position of the high-definition transparent glaze area and the semi-gloss transparent glaze area; dry granule mixture B is applied at the boundary position of the semi-gloss transparent glaze area and the soft light opaque glaze area; and dry granule mixture C is applied at the boundary position of the high-definition transparent glaze area and the soft light opaque glaze area. (4c) After the dry granule mixture is applied, the scraper will level the dry granule mixture at the boundary position so that it is level with the high-definition transparent glaze area, the semi-gloss transparent glaze area and the soft-light opaque glaze area. S4. Using a belt-driven cloth feeding machine, high-definition transparent glaze dry granules are applied to the high-definition transparent glaze area, semi-gloss transparent glaze dry granules are applied to the semi-gloss transparent glaze area, and soft-light opaque glaze dry granules are applied to the soft-light opaque glaze area. Then, a digital line cloth feeding process is used, with a multi-stage belt-driven cloth feeding machine forming pre-set lines on the terminal belt that match the shape of the area boundary. The corresponding dry granule mixture is applied, and the boundary is gradually transitioned through discrete points. The mixture is dried at 75°C for 15 minutes, then fired at 1220°C for 20 minutes, and then cooled. The cooling process includes a rapid cooling section and a slow cooling section. The rapid cooling section reduces the temperature from 1220°C to 650°C in 5 minutes, and the slow cooling section reduces the temperature from 650°C to room temperature in 30 minutes, resulting in a ceramic plate with dry granule phase-separated glaze positioning decoration.

[0041] Comparative Example 1: The difference between Comparative Example 1 and Example 3 is that the chemical composition of the high-definition transparent glaze dry granules used in Comparative Example 1 is different, while the rest is the same as in Example 3. The high-definition transparent glaze dry granules in Comparative Example 1 comprise the following chemical composition by mass percentage: SiO2 39.0%, Al2O3 38.0%, B2O3 7.0%, CaO 18.0%, MgO 6.0%, BaO 4.0%, K2O 8.5%, Na2O 7.5%, Li2O 1.5%, and loss on ignition 0.5%; the suitable operating temperature for the high-definition transparent glaze dry granules is 1220℃, and the coefficient of thermal expansion is 7.5 × 10⁻⁶. -6 / ℃; particle size 0.8mm, application rate 1.71g / cm³ 3 .

[0042] Comparative Example 2: The difference between Comparative Example 2 and Example 3 is that the chemical composition of the high-definition transparent glaze dry granules used in Comparative Example 2 is different, while the rest is the same as in Example 3. The high-definition transparent glaze dry granules in Comparative Example 2 comprise the following chemical composition by mass percentage: SiO2 51.0%, Al2O3 11.0%, B2O3 7.0%, CaO 16.0%, MgO 8.5%, BaO 1.5%, K2O 1.5%, Na2O 1.0%, Li2O 2.0%, and loss on ignition 0.5%; the suitable temperature for the high-definition transparent glaze dry granules is 1160℃, and the coefficient of thermal expansion is 5.0 × 10⁻⁶. -6 / ℃; particle size 0.8mm, application rate 1.71g / cm³ 3 .

[0043] Comparative Example 3: Compared with Example 3, Comparative Example 3 differs in that, in Comparative Example 3, high-definition transparent glaze dry granules, semi-gloss transparent glaze dry granules, and soft-light opaque glaze dry granules were pre-mixed evenly in a mass ratio of 1:1:1 and then applied to the brick surface in one go without partitioning or setting boundary gradients. The firing process was the same as in Example 3.

[0044] Comparative Example 4: Compared with Example 3, Comparative Example 4 differs in that the three dry granule partitioning and positioning methods in Comparative Example 4 do not form a boundary gradient transition through discrete points, but are otherwise the same as Example 3.

[0045] Comparative Example 5: The difference between Comparative Example 5 and Example 3 is that the cooling process in Comparative Example 5 is different, while the rest is the same as in Example 3. The cooling process of Comparative Example 5 is as follows: the cooling process includes a rapid cooling section and a slow cooling section, wherein the rapid cooling section cools the temperature from 1220°C to 650°C in 15 minutes; and the slow cooling section cools the temperature from 650°C to room temperature in 30 minutes.

[0046] Comparative Example 6: The difference between Comparative Example 6 and Example 3 is that the cooling process in Comparative Example 6 is different, while the rest is the same as in Example 3. The cooling process of Comparative Example 6 is as follows: the cooling process includes a rapid cooling section and a slow cooling section, wherein the rapid cooling section cools the temperature from 1220°C to 650°C in 5 minutes; and the slow cooling section cools the temperature from 650°C to room temperature in 10 minutes.

[0047] Comparative Example 7: The difference between Comparative Example 7 and Example 3 is that the raw materials for preparing the glaze in Comparative Example 7 are different, while the rest are the same as in Example 3. The preparation method of the surface glaze in Comparative Example 7 is as follows: 14 parts by weight of potassium feldspar, 15 parts by weight of sodium feldspar, 10 parts by weight of calcined kaolin, 6 parts by weight of ball clay, 12 parts by weight of quartz powder, 2 parts by weight of dolomite, 2 parts by weight of zinc oxide and 1 part by weight of sodium hexapolymetaphosphate are added to a ball mill, 45 parts by weight of water are added for wet ball milling, and the fineness of the ball milling is controlled to be ≤0.5% on a 325-mesh sieve. Then, the iron is removed by magnetic separation, and the glaze is aged in a storage tank for 24 hours to obtain the surface glaze.

[0048] Comparative Example 8: Compared with Example 3, Comparative Example 8 is different in that, after firing, rapid cooling control is not used in Comparative Example 8, and the furnace is directly cooled to room temperature naturally. Otherwise, it is the same as Example 3.

[0049] I. The ceramic plate samples prepared in Examples 1-3 and Comparative Examples 1-8 were subjected to appearance tests. The surface texture was evaluated by visual inspection and tactile assessment by those skilled in the art; the boundary transition effect was evaluated by visual inspection by those skilled in the art, and auxiliary tools such as magnifying glasses could be used if necessary. The results are shown in Table 1 below.

[0050] Table 1: Example 1 Rich in layers, with excellent natural stone effect and delicate texture. Natural and soft, without rigid boundaries Example 2 Rich in layers, with excellent natural stone effect and delicate texture. Natural and soft, without rigid boundaries Example 3 Rich in layers, with excellent natural stone effect and delicate texture. Natural and soft, without rigid boundaries Comparative Example 1 The sense of layering is weakened, and obvious cracks appear. Cracks extend in the boundary region Comparative Example 2 Glaze shrinkage is observed in transparent areas, resulting in poor glaze surface smoothness. The glaze shrinkage area affects the boundary integrity Comparative Example 3 The surface has a uniform, unlayered texture with a single, mixed glossy finish and no distinct decorative effect. No partition boundaries, unified as a whole Comparative Example 4 The zones are clearly defined, but there are obvious boundaries between them, resulting in a visually stiff and unnatural appearance. There is a clearly rigid boundary line Comparative Example 5 The glaze has low gloss, slight opacity in the transparent areas, and a rough texture. The boundary transition is acceptable. Comparative Example 6 Microcracks appeared in the transparent areas, and the gloss was uneven between the semi-gloss and opaque areas, resulting in a decrease in overall texture. The boundary transition is acceptable, but there are small cracks in some areas. Comparative Example 7 The surface glaze lacks whiteness, causing the base glaze color to show through and the pattern layer to appear dark; the surface glaze has a high high-temperature viscosity, resulting in poor leveling and a slightly uneven, orange-peel-like texture, making it feel rough to the touch. The transition at the edges is acceptable, but the orange peel effect detracts from the overall visual appeal. Comparative Example 8 The glaze appears cloudy and hazy overall, with obvious loss of transparency in the transparent areas and coarse, unevenly distributed crystals in the opaque areas, resulting in a rough and poor texture and a poor natural stone effect. Although there are no rigid lines at the edges, the overall glaze has deteriorated, and the edges are blurred and indistinct. II. The ceramic plate samples prepared in Examples 1-3 and Comparative Examples 1-8 were subjected to performance tests. Stain resistance was determined according to GB / T 3810.14-2016 standard (5-level system, level 5 being optimal); corrosion resistance was determined according to GB / T39156-2020 standard (chemical corrosion resistance). The results are shown in Table 2 below.

[0051] Table 2: Performance Test Results Example 1 5 GA Example 2 5 GA Example 3 5 GA Comparative Example 1 3 GC Comparative Example 2 3 GC Comparative Example 3 5 GA Comparative Example 4 5 GA Comparative Example 5 4 GB Comparative Example 6 4 GB Comparative Example 7 3 GC Comparative Example 8 4 GB Analysis of Tables 1 and 2 shows that this invention, through the application of three different types of dry granules with varying optical effects and combined with discrete point gradient boundary technology, enables the ceramic slabs of Examples 1-3 to exhibit a richly layered, delicately textured natural stone-like surface. Furthermore, the boundaries between each area transition naturally and smoothly. Simultaneously, the products exhibit excellent stain resistance and chemical corrosion resistance, achieving a synergistic improvement in both artistic decorative effect and performance. Compared to Example 3, the chemical composition of the high-definition transparent glaze dry granules used in Comparative Example 1 is different, resulting in an increased coefficient of thermal expansion of 7.5 × 10⁻⁶. -6 The coefficient of thermal expansion of the high-definition transparent glaze granules is significantly higher than that of semi-gloss transparent granules and soft-light opaque glaze granules. During the cooling process after firing, the shrinkage of the transparent glaze layer with a larger coefficient of thermal expansion is much greater than that of the underlying layer, resulting in excessive tensile stress in the transparent glaze layer. When this stress exceeds the tensile strength of the glaze layer itself, obvious cracking and peeling occur in the transparent area, and the cracks even extend into the adjacent semi-gloss area, leading to a deterioration in surface texture. At the same time, the cracks penetrating the glaze layer affect the stain resistance and corrosion resistance, indicating that the coefficient of thermal expansion of the high-definition transparent glaze granules, semi-gloss transparent glaze granules, and soft-light opaque glaze granules of this invention, when at an appropriate value, helps to improve product quality. In Comparative Example 2, the chemical composition of the high-definition transparent glaze granules is different, resulting in a coefficient of thermal expansion of the transparent glaze reduced to 5.0 × 10⁻⁶. -6At a temperature of / ℃, during the cooling process, the transparent glaze layer with a smaller coefficient of thermal expansion shrinks significantly less than the semi-gloss transparent glaze and soft-light opaque glaze layers at the bottom, causing the transparent glaze layer to bear compressive stress. Under this compressive stress, the molten high-definition transparent glaze is squeezed by the bottom layer during cooling and shrinkage, failing to fully spread and wet the surface of the blank. This results in localized glaze shrinkage in the transparent area, leading to discontinuous glaze surface and poor flatness, severely affecting the artistic decorative effect of the surface. At the same time, the glaze shrinkage phenomenon also affects the stain resistance and corrosion resistance, indicating that the difference in the coefficient of thermal expansion of the three dry particles must be controlled within a small range to ensure that the shrinkage of each layer is consistent during the cooling process, preventing tensile stress cracking and glaze shrinkage due to excessive compressive stress, thereby obtaining a complete, dense, and flat glaze surface. In Comparative Example 3, the three types of dry granules were pre-mixed and applied as a whole without zoning or positioning. This resulted in a single, mixed luster on the glaze surface after firing. The three dry granules melted and mixed together during firing, preventing the formation of a structure where high-definition transparent glaze areas, semi-gloss transparent glaze areas, and soft-light opaque glaze areas were arranged according to a pre-defined pattern. The surface texture was uniform and lacked depth, missing the uneven texture characteristics of natural stone. This demonstrates that the three dry granules must be applied in a zoning and positioning manner, rather than simply mixed, to maintain their independent phase structure and optical characteristics after firing, thus achieving a multi-textured composite decorative effect. In Comparative Example 4, although the three dry granules were applied in a zoning and positioning manner, the lack of a gradual transition at discrete points resulted in obvious, rigid boundaries between the texture areas, appearing visually unnatural and lacking decorative artistic effect. This indicates that the discrete point gradual boundary technology can effectively improve the aesthetic effect, achieving a highly realistic artistic effect similar to natural stone. In Comparative Example 5, the rapid cooling stage lasted 15 minutes, resulting in an excessively long high-temperature phase. This caused crystallization and devitrification of the glass phase in the transparent glaze region, leading to lower gloss and a rougher feel in the transparent area. Simultaneously, the slower cooling rate in the rapid cooling stage reduced the density of the glaze layer, resulting in lower stain resistance and corrosion resistance compared to Example 3. This demonstrates that controlling the cooling process can suppress glass crystallization and ensure glaze density, thus balancing optical transparency and surface physicochemical properties. In Comparative Example 6, the slow cooling stage lasted 10 minutes, resulting in insufficient release of the thermal shrinkage differences between the body and each glaze layer. This led to a decrease in overall texture, and lower stain resistance and corrosion resistance compared to Example 3. This indicates that the slow cooling stage allows stress in each layer to be gradually released through elastic relaxation, preventing cracking and promoting a smooth and delicate glaze surface. The raw materials for preparing the glaze in Comparative Example 7 are different from those in Example 3. Due to the lack of zirconium silicate, the glaze lacks ZrSiO4 opacifier, resulting in insufficient whiteness after firing. It cannot effectively cover the base color of the body, causing the base glaze and body color to show through, making the pattern layer above dark and reducing the contrast. At the same time, the different raw materials for preparing the glaze in Comparative Example 7 result in a significant increase in the overall high-temperature viscosity of the glaze, which reduces its melt spreadability. After firing, the glaze surface cannot be fully leveled, forming an orange peel-like micro-undulation and a rough feel.These defects not only significantly degrade the surface texture, but also cause dirt and grime to accumulate in the micro-pits formed by the orange peel-like micro-undulations. This results in the ceramic plate's overall stain resistance and corrosion resistance being inferior to that of Example 3. This indicates that the formulation of the glaze is one of the fundamental conditions for ensuring the overall decorative effect of the present invention. The appropriate addition of zirconium silicate is crucial for providing sufficient opaque whiteness to complement the colors of the pattern layer. The ratio of feldspar to quartz is controlled within a reasonable range to ensure that the glaze has a suitable high-temperature viscosity, which can fully melt and form a smooth and flat glaze surface. In Comparative Example 8, after firing, rapid cooling was not used; instead, the glaze was allowed to cool naturally in the furnace. This resulted in the glaze layer remaining in the high-temperature region (1220~650℃) for an extremely long time. The microcrystalline phases (such as zircon and white garnet) precipitated in the three dry particles became excessively coarse. At the same time, the transparent glaze glass phase crystallized and became opaque, leading to an overall cloudy and hazy glaze surface, severe opacity in the transparent area, and coarse and unevenly distributed crystals in the opaque area. The texture was rough and poor, resulting in a poor natural stone effect. Furthermore, due to the decrease in glaze density, the stain resistance and corrosion resistance were not as good as in Example 3. This indicates that the actively controlled rapid cooling section can lock the ideal crystallization state of the glaze layer formed at high temperatures through rapid cooling, avoiding excessive crystallization and devitrification, thereby ensuring the optical effect and surface durability of the product.

[0052] In addition, combined Figures 1-3 The technical solution of the present invention will be further explained.

[0053] Figure 1 This is a schematic diagram of the ceramic plate product prepared in Example 1 of the present invention. Figure 1 As can be seen, the ceramic slab presents a blurred, gradual transition zone. This is because the boundaries of each area use a mixture of adjacent dry granules and achieves a gradual transition boundary through discrete points, thereby visually eliminating the patchwork feel commonly found in traditional partitioned decoration. Figure 1 The invention visually demonstrates the macroscopic structural features of the multi-textured zoning and natural boundary transitions on the surface of the ceramic slab, illustrating that the invention can achieve the effect of gloss and transparency differences caused by uneven mineral distribution in natural stone through dry particle zoning and positioning technology.

[0054] Figure 2 This is a schematic diagram illustrating the application of high-definition transparent glaze dry granules, semi-gloss transparent glaze dry granules, and soft-light opaque glaze dry granules using a belt conveyor in Embodiment 1 of the present invention. Figure 2 It can be seen from this: Figure 2This invention clearly demonstrates that it enables the precise positioning and application of three types of dry granules on the surface of the brick blank. The three types of dry granules with different optical effects are precisely distributed in their respective areas according to a preset pattern, resulting in a layered composite structure in the ceramic slab. From bottom to top, it includes a body layer 1, a base glaze layer 2 covering the body layer, a top glaze layer 3 covering the base glaze layer, and a phase-separated glaze layer covering the top glaze layer. The phase-separated glaze layer is not a single uniform glaze surface, but rather consists of a high-definition transparent glaze area 4, a semi-gloss transparent glaze area 5, and a soft-light opaque glaze area 6 arranged in a preset pattern. These three areas are spatially adjacent and interlocking, each occupying a specific patterned position on the brick surface.

[0055] Figure 3 This is a schematic diagram illustrating the application of a corresponding dry granular mixture on a pre-defined line conforming to the shape of a region boundary on the terminal belt, as described in Embodiment 1 of the present invention. Figure 3 It can be seen that after the three different optical dry particles are applied in separate areas, the boundary treatment process begins. Dry particle mixture A9 is applied at the boundary 7 between the high-definition transparent glaze area and the semi-gloss transparent glaze area, dry particle mixture B10 is applied at the boundary 8 between the semi-gloss transparent glaze area and the soft-light opaque glaze area, and dry particle mixture C is applied at the boundary between the high-definition transparent glaze area and the soft-light opaque glaze area. Figure 3 (Not shown in the image), these dry granular mixtures are precisely applied to the boundary lines using a digital line application process, and then smoothed with a scraper to make them level with the adjacent areas. During the subsequent firing process, the dry granular mixture at the boundary melts, forming a gradient transition in composition and optical properties. This eliminates abrupt interfaces between adjacent areas, ultimately creating a gradual transition boundary composed of discrete points. This demonstrates the synergistic effect of the digital line application process and the discrete point gradual transition technology, which helps to enhance the artistic effect of natural stone.

[0056] The above embodiments are preferred implementations of the present invention. In addition, the present invention can be implemented in other ways. Any obvious substitutions without departing from the concept of the present invention are within the protection scope of the present invention.

Claims

1. A ceramic slab with dry-granule phase-separated glaze for positioning and decoration, characterized in that, The ceramic plate includes a body layer, a base glaze layer covering the body layer, a top glaze layer covering the base glaze layer, a pattern layer covering the top glaze layer, and a phase-separated glaze layer covering the pattern layer. The phase-separated glaze layer has a structure in which high-definition transparent glaze area, semi-gloss transparent glaze area and soft-light opaque glaze area are arranged in a preset pattern, and the adjacent areas form a gradual transition boundary through discrete points. The high-definition transparent glaze area is formed by firing high-definition transparent glaze dry particles; the semi-gloss transparent glaze area is formed by firing semi-gloss transparent glaze dry particles; the soft-light opaque glaze area is formed by firing soft-light opaque glaze dry particles; and the gradient transition boundary is formed by firing a mixture of two adjacent dry particles. The high-definition transparent glaze dry granules comprise the following chemical composition by weight percentage: SiO2 40~42.0%, Al2O3 8.2~8.5%, B2O3 6.8~7.0%, CaO 18.0~19.0%, MgO 6.5~7.2%, ZnO 7.0~7.5%, BaO 2.5~3.0%, K2O 4.0~4.5%, Na2O 2.3~2.5%, Li2O 1.5~2.0%, and loss on ignition 0.5~5%. The semi-transparent glaze dry granules comprise the following chemical composition by weight percentage: SiO2 55.0~56.0%, Al2O3 8.0~8.5%, B2O3 6.0~6.5%, CaO 10.0~12.5%, MgO 3.0~4.0%, ZnO 3.0~4.0%, K2O 7.5~8.5%, Na2O 3.0~3.5%, Li2O 0.5~1.0%, CeO2 1.0~1.5%, and loss on ignition 0.5~5%. The soft-light opaque glaze dry granules comprise the following chemical composition by weight percentage: SiO2 55~58.0%, Al2O3 12.0~13.0%, B2O3 5.5~6.0%, CaO 8.9~9.0%, MgO 2.6~3.0%, K2O 3.5~4.5%, Na2O 2.0~2.5%, CeO2 0.5~1.0%, ZrO2 5.0~6.0%, and loss on ignition 0.5~5%; The surface glaze layer is prepared by the surface glaze, and the surface glaze includes the following raw materials in parts by weight: 10-15 parts potassium feldspar, 8-12 parts sodium feldspar, 8-12 parts calcined kaolin, 5-8 parts clay, 3-5 parts zirconium silicate, 10-15 parts quartz powder, 1-3 parts dolomite, 1-3 parts zinc oxide, 1-2 parts dispersant, and 30-50 parts water.

2. The ceramic plate according to claim 1, characterized in that, The high-definition transparent glaze dry granules are suitable for temperatures ranging from 1160 to 1220℃, and have an expansion coefficient of (6.0 to 6.2) × 10⁻⁶. -6 / ℃; the suitable temperature range for the semi-gloss transparent glaze dry granules is 1165~1220℃, and the coefficient of thermal expansion is (5.5~5.8)×10. -6 / ℃; the suitable temperature range for the dry granules of the soft-light opaque glaze is 1180~1220℃, and the coefficient of thermal expansion is (5.5~5.8)×10. -6 / ℃.

3. The ceramic plate according to claim 1, characterized in that, The dry granule mixture of the two adjacent dry granules includes: a dry granule mixture A formed by mixing the high-definition transparent glaze dry granules and the semi-gloss transparent glaze dry granules in a mass ratio of 1:1; a dry granule mixture B formed by mixing the semi-gloss transparent glaze dry granules and the soft-light opaque glaze dry granules in a mass ratio of 1:1; and a dry granule mixture C formed by mixing the high-definition transparent glaze dry granules and the soft-light opaque glaze dry granules in a mass ratio of 1:

1.

4. The ceramic plate according to claim 1, characterized in that, The particle size of the high-definition transparent glaze dry granules, the semi-gloss transparent glaze dry granules, and the soft-light opaque glaze dry granules is ≤1.0mm; the application rate is 1.68~1.72g / cm³. 3 .

5. A method for preparing a ceramic slab with dry-particle phase-separated glaze for positioning and decoration, characterized in that, The preparation method is used to prepare ceramic slabs with dry granule phase-separated glaze positioning decoration as described in any one of claims 1 to 4, and the preparation method includes the following steps: S1. Apply a base glaze to the body layer to form a base glaze layer; S2. Apply a top glaze to the base glaze layer to form a top glaze layer; S3. The patterns of various products to be produced are compiled into a program format and pre-stored in the central operating system. After the operator confirms the product type, the system automatically retrieves the corresponding product program and sends the color separation layer to each inkjet printing station with printing instructions. Each inkjet printing station prints glue according to the order and designated area specified by the operation program to form the pattern layer. S4. Using a belt-driven cloth feeding machine, high-definition transparent glaze dry granules are applied to the high-definition transparent glaze area, semi-gloss transparent glaze dry granules are applied to the semi-gloss transparent glaze area, and soft-light opaque glaze dry granules are applied to the soft-light opaque glaze area. Then, a digital line cloth feeding process is used, with a multi-stage belt-driven cloth feeding machine forming pre-set lines on the terminal belt that match the shape of the area boundary, and applying the corresponding dry granule mixture. The boundary is gradually transitioned through discrete points. After drying, firing, and cooling, the cooling process includes a rapid cooling section and a slow cooling section. The rapid cooling section reduces the temperature from 1200~1220℃ to 600~650℃ in 3~8 minutes; the slow cooling section reduces the temperature from 600~650℃ to room temperature in 20~40 minutes, resulting in a ceramic slab with dry granule phase-separated glaze positioning decoration.

6. The preparation method according to claim 5, characterized in that, In step S1, the base glaze is a white, opaque glaze, and the density of the base glaze slurry is 1.80~1.82 g / cm³. 3 The glaze application amount is 500~510g / m² 2 .

7. The preparation method according to claim 5, characterized in that, In step S2, the surface glaze is a semi-opaque glaze, and the density of the glaze slurry is 1.78~1.80 g / cm³. 3 The glaze application rate is 450~480g / m². 2 .

8. The preparation method according to claim 5, characterized in that, In step S4, the specific method for forming a gradual transition boundary through discrete points is as follows: (4a) A dry granule mixture formed by mixing the high-definition transparent glaze dry granules and the semi-gloss transparent glaze dry granules in a mass ratio of 1:1; B dry granule mixture formed by mixing the semi-gloss transparent glaze dry granules and the soft-light opaque glaze dry granules in a mass ratio of 1:1; C dry granule mixture formed by mixing the high-definition transparent glaze dry granules and the soft-light opaque glaze dry granules in a mass ratio of 1:

1. (4b) Using digital line fabrication technology, a pre-set line that matches the shape of the area boundary is formed on the terminal belt by a multi-stage belt fabrication machine, and dry granule mixture A is applied at the boundary position of the high-definition transparent glaze area and the semi-gloss transparent glaze area; Dry granule mixture B is applied at the boundary between the semi-gloss transparent glaze region and the soft-light opaque glaze region; dry granule mixture C is applied at the boundary between the high-definition transparent glaze region and the soft-light opaque glaze region. (4c) After the dry granule mixture is applied, the scraper will level the dry granule mixture at the boundary position so that it is level with the high-definition transparent glaze area, the semi-gloss transparent glaze area and the soft-light opaque glaze area.

9. The preparation method according to claim 5, characterized in that, In step S4, the drying temperature is 60~80℃ and the drying time is 10~15min.

10. The preparation method according to claim 5, characterized in that, In step S4, the firing temperature is 1200~1220℃, and the holding time is 10~20min.

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