CN108715516B - White glaze, whole body borderless ceramic tile containing white glaze and preparation method thereof - Google Patents
White glaze, whole body borderless ceramic tile containing white glaze and preparation method thereof Download PDFInfo
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- CN108715516B CN108715516B CN201810676340.4A CN201810676340A CN108715516B CN 108715516 B CN108715516 B CN 108715516B CN 201810676340 A CN201810676340 A CN 201810676340A CN 108715516 B CN108715516 B CN 108715516B
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C8/00—Enamels; Glazes; Fusion seal compositions being frit compositions having non-frit additions
- C03C8/14—Glass frit mixtures having non-frit additions, e.g. opacifiers, colorants, mill-additions
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C8/00—Enamels; Glazes; Fusion seal compositions being frit compositions having non-frit additions
- C03C8/14—Glass frit mixtures having non-frit additions, e.g. opacifiers, colorants, mill-additions
- C03C8/20—Glass frit mixtures having non-frit additions, e.g. opacifiers, colorants, mill-additions containing titanium compounds; containing zirconium compounds
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
- C04B41/52—Multiple coating or impregnating multiple coating or impregnating with the same composition or with compositions only differing in the concentration of the constituents, is classified as single coating or impregnation
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/80—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone of only ceramics
- C04B41/81—Coating or impregnation
- C04B41/89—Coating or impregnation for obtaining at least two superposed coatings having different compositions
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Abstract
The invention relates to white glaze, a whole body borderless ceramic tile containing the white glaze and a preparation method thereof. The white glaze comprises the following raw materials in percentage by weight: 60-75% of an opacifier, 15-28% of an opacified frit and 4-15% of clay; the ceramic tile is composed of green body decoration layer, white glaze layer, comprehensive decoration layer, transparent glaze or protective glaze layer. The preparation method comprises the following steps: polishing the surface of the blank by using a sponge material; after the drying procedure, printing white glaze on the surface of the blank by using a rubber roller, and sintering the white glaze at 1100-1200 ℃ to form a white glaze layer of the whole body borderless ceramic tile; weighing materials of the white glaze according to a formula, adding 45 wt% of printing oil, and performing ball milling until the fineness of glaze slip is less than 40 micrometers; the viscosity of the glaze slip is adjusted to 18-23 seconds, and the specific gravity of the glaze slip is 1.53-1.62.
Description
Technical Field
The invention relates to the field of ceramics, in particular to white glaze, a whole body borderless ceramic tile containing the white glaze and a preparation method thereof.
Background
In recent years, concept products such as full-body marble, full-body archaized bricks and the like in the architectural ceramic industry are favored by consumers, and full-body products require that the surface of the ceramic wall and floor tile is basically consistent with the texture and color tone inside a blank body, so that the ceramic tiles are identical and integrated. However, in the production process of ceramic wall and floor tiles, a process flow of blank → make-up soil/ground glaze → printing → transparent glaze/protective glaze is usually adopted, a white glaze layer with the thickness of 0.2-0.4 mm exists between the surface texture printed decorative layer and the blank of the ceramic tile product obtained by the preparation method, and after post-processing procedures such as water jet cutting, edge chamfering, grooving and the like, the middle white glaze layer and the blank form a large contrast, so that a 'white line' effect is presented, the blank texture and the surface decorative layer are isolated, the decoration effect of the same surface and inside of the ceramic cannot be realized, and the ceramic tile product becomes a defect of the conventional general ceramic tile concept product. In foreign countries, in order to solve the problem of white boundary, some ceramic tile manufacturing enterprises adopt a mode of improving a blank body formula to directly print on a blank; many manufacturers and research institutions in China have related research, but the direct printing process on the blank cannot realize large-scale production in enterprises due to the factors of blank raw material characteristics, process requirements, cost control and the like in China.
CN201610574716 discloses a process for eliminating white boundary line of colorful marble tile and colorful marble tile thereof, wherein a pressed fabric layer is used to replace spraying makeup soil or ground glaze, and an inkjet pattern-infiltrating process is used to perform three-dimensional decoration after pressing the fabric layer, so as to achieve the effect of eliminating the white boundary line.
Disclosure of Invention
The invention aims to provide the white glaze for the ceramic tile with the whole body and no boundary line, which realizes the complete consistency of the pattern and color textures from top to bottom from the outside to the inside, adopts a white glaze printing mode to replace the traditional makeup clay on the glaze combination, obtains the whiteness and the functional effect consistent with the ground glaze, reduces the thickness of a glaze layer from 0.2-0.4 mm to less than 0.06mm, visually eliminates the white boundary, and obtains the effect that the green body and the glaze decoration layer have no white boundary line. The invention also aims to provide a full body ceramic tile without boundary lines, which realizes the real meaning of the ceramic tile product, wherein the full body of the ceramic tile product contains white glaze. The invention further aims to provide a preparation method of the whole body borderless ceramic tile, which adopts a flat printing or rubber roller printing way for glazing, effectively eliminates white lines between a green body and a surface decoration glaze layer, is more vivid in effect on the imitation jade ceramic tile product and realizes the consistency of the surface and the inside.
The first technical proposal of the invention is the white glaze of the ceramic tile without boundary line, which is characterized by comprising the following raw materials by weight percentage:
60-75% of opacifier, 15-28% of opacified frit and 4-15% of clay.
Preferably, the method comprises the following steps: the opacifier is one or the combination of several of tin oxide, zirconium oxide, titanium oxide, cerium oxide and superfine zirconium silicate.
Preferably, the method comprises the following steps: the opacification frit adopts one or a combination of several of zirconium white opacification frit, zirconium titanium system opacification frit and phosphorus zirconium composite opacification frit.
The second technical proposal of the invention is that the whole body ceramic tile without boundary line containing white glaze is characterized in that the ceramic tile is composed of a green body decorative layer, a white glaze layer, a comprehensive decorative layer and a transparent glaze or a protective glaze layer.
The third technical proposal of the invention is a preparation method of the ceramic tile without boundary line, which is characterized by comprising the following procedures:
after a green body is molded, polishing the surface of the green body by using a sponge material;
secondly, after the polished green body is subjected to a drying process, printing white glaze on the surface of the green body by using a rubber roller, and sintering the white glaze at 1100-1200 ℃ to form a white glaze layer of the whole body borderless ceramic tile;
weighing the materials according to the formula, adding 45 wt% of stamp-pad ink, and performing ball milling until the fineness of glaze slip is less than 40 micrometers;
adding a debonder and a stamp-pad ink, adjusting the viscosity of the glaze slip to an En type viscosity for 18-23 seconds, wherein the specific gravity of the glaze slip is 1.53-1.62;
the material of the rubber roller is engraved by adopting an ultra-soft roller, 40-60% gray transparent and uniform file is used for engraving, and 1-3 rubber rollers are used for printing in rubber roller printing;
sixthly, enabling the green bricks printed with the white glaze to enter a multi-channel digital ink-jet printer for surface comprehensive decoration, wherein the multi-channel digital ink-jet printer adopts a combination mode of color ink and functional ink and adopts a low-ink-volume fine spray head for pattern decoration;
after the surface of the product is comprehensively decorated by a digital ink-jet printer, the ink for pattern decoration has infiltration capacity, penetrates a white glaze layer with the thickness of 0.06mm, and the comprehensive decoration layer and a blank have no boundary line visually;
and after the surface of the green brick is comprehensively decorated, applying transparent glaze or spraying protective glaze of lubricating and fine glaze on the surface decoration layer.
The self-skin is sprayed with protective glaze and then enters a roller kiln to be sintered at the sintering temperature of 1100-1200 ℃ for 80-95 minutes, and the whole body borderless ceramic tile product is obtained after polishing and edging.
Preferably, the method comprises the following steps: the steps further include: the method of spraying transparent glaze is used for product protective glaze with flat surface, namely, a linear glaze spraying device is adopted for glazing, the glazing specific gravity is 1.82-1.86, and the glazing amount is 450-700 g/m2The En-type viscosity is 18-25 s.
Preferably, the method comprises the following steps: the steps further include: for the archaized brick products, a process of spraying lubricating fine glaze is adopted, the glazing specific gravity is 1.22-1.32, and the glazing amount is 120-200 g/m2The En-type viscosity is 12-18 s.
The fourth technical proposal of the invention is a preparation method of the ceramic tile without boundary line, which is characterized by comprising the following procedures:
after a green body is molded, polishing the surface of the green body by using a sponge material;
secondly, printing white glaze on the surface of the polished green body by adopting a flat plate process after the green body is subjected to a drying process;
weighing the materials according to the formula, adding 45 wt% of water, and performing ball milling until the fineness of glaze slip is less than 40 micrometers;
fourthly, adding a thickening agent and a printing material into the glaze slip, and adjusting the specific gravity of the white glaze material to be 1.32-1.48 so that the performance of the glaze slip is adjusted to meet the requirements of a flat printing process;
controlling the blank temperature to be 38-45 ℃ before printing the white glaze slurry, and adopting 200-mesh all-through pattern screen cloth for the flat screen;
sixthly, enabling the green bricks printed with the white glaze to enter a multi-channel digital ink-jet printer for surface comprehensive decoration, wherein the multi-channel digital ink-jet printer adopts a combination mode of color ink and functional ink and adopts a low-ink-volume fine spray head for pattern decoration;
after the surface of the product is comprehensively decorated by a digital ink-jet printer, the ink for pattern decoration has infiltration capacity, penetrates a white glaze layer with the thickness of 0.06mm, and the comprehensive decoration layer and a blank have no boundary line visually;
after the surface of the green brick is comprehensively decorated, applying transparent glaze or spraying protective glaze of lubricating and fine glaze on the surface decoration layer;
the self-skin is sprayed with protective glaze and then enters a roller kiln to be sintered at the sintering temperature of 1100-1200 ℃ for 80-95 minutes, and the whole body borderless ceramic tile product is obtained after polishing and edging.
Preferably, the method comprises the following steps: the steps further include: the method of spraying transparent glaze is used for product protective glaze with flat surface, namely, a linear glaze spraying device is adopted for glazing, the glazing specific gravity is 1.82-1.86, and the glazing amount is 450-700 g/m2The En-type viscosity is 18-25 s.
Preferably, the method comprises the following steps: the steps further include: for the archaized brick products, a process of spraying lubricating fine glaze is adopted, the glazing specific gravity is 1.22-1.32, and the glazing amount is 120-200 g/m2The En-type viscosity is 12-18 s.
Compared with the prior art, the invention has the beneficial effects that:
the invention realizes the complete consistency of the patterns from top to bottom from the outside to the inside by the design and combination of the comprehensive decoration technology of the multi-channel digital ink jet printer and the precise distribution technology of the green body, on the glaze combination, the traditional cosmetic clay is replaced by printing white glaze, the whiteness and the functional effect which are consistent with those of the ground coat are obtained, the thickness of the glaze layer is reduced from 0.2-0.4 mm to less than 0.06mm, after ink-jet decoration, the ink-jet ink permeates the white glaze layer with the thickness of 0.06mm, the white boundary is visually eliminated, the effect that the blank body and the glaze decoration layer have no white boundary is obtained, the true full-through body of the ceramic wall and floor tile product is realized, and the use of the functional inks such as the golden carving ink, the sinking ink, the anion ink, the metal ink and the like improves the three-dimensional effect of the unbounded full-through body tile, endows the ceramic tile with the functional characteristics and the artistic characteristics, and simultaneously reduces the comprehensive manufacturing cost of the ceramic tile.
In the preparation method, the sponge body material is used for polishing the surface of the blank, so that the flatness of the surface can be improved, the uniformity and the stability of the white base glaze printed in the subsequent process are facilitated, and the printing defects are reduced.
According to the preparation method, the color ink is combined by blue, brown, orange yellow, golden yellow, coated red, coated golden yellow and black, so that the three-dimensional effect of the unbounded full-body brick is improved, the functional characteristics and the artistic characteristics of the ceramic brick are endowed, and meanwhile, the comprehensive manufacturing cost of the ceramic brick is reduced. The functional ink is formed by combining gold carving ink, sinking ink, negative ion ink and metal ink, and the functional ink nozzle system mainly adopts a large-ink-volume nozzle, so that the product is ensured to meet the functional requirements.
In the preparation method, pattern characteristic texture blank decoration can be achieved by using the cloth system, the pattern characteristic texture blank is matched with the inkjet design texture, and accurate alignment products are produced.
Sixthly, selecting one or more of opacifiers such as tin oxide, zirconium oxide, titanium oxide, cerium oxide, ultrafine zirconium silicate and the like as opacifiers for the opacifiers in the colored glaze, wherein the opacifiers are narrow in particle size distribution requirement, uniform in fineness, more than 99.5% in purity and consistent in crystal structure, and the raw materials need to be screened by a standard screen of 325 meshes.
The selection of opacifiers in the colored glaze is different, the color purity and the opacifying effect of the white basic glaze are not consistent, and the white glaze layer obtained by selecting titanium oxide as the opacifier is slightly yellow in color, so that the development of apricot yellow products is facilitated; the zirconium series is selected as the opacifier to obtain the white glaze layer which has pure tone and no color cast and is beneficial to developing white series products; different opacifiers can be selected according to the color tone of the developed product.
In the colored glaze, the opacified frit and the opacifier react at high temperature in the formula, so that the white glaze has good adhesion performance, and the bonding performance of the white glaze layer and the green body layer is enhanced.
Drawings
FIG. 1 is a schematic view of a precision dispensing system of the present invention.
Description of the main component symbols:
first distributing hopper 1, second distributing hopper 2, third distributing hopper 3, first transition belt 4
Characteristic texture distributing mechanism 9A characteristic texture distributing mechanism 9B grating storage rack 10 distributing platform 11
Detailed Description
The invention will be described in more detail below with reference to an embodiment and the attached drawings:
the white glaze of the ceramic tile without the boundary line comprises the following raw materials in percentage by weight:
opacifier 75%, opacification clinker 20% and clay 5%.
The opacifier is one or the combination of several of tin oxide, zirconium oxide, titanium oxide, cerium oxide and superfine zirconium silicate.
The opacification frit adopts one or a combination of several of zirconium white opacification frit, zirconium titanium system opacification frit and phosphorus zirconium composite opacification frit.
The preparation method of the ceramic tile with the whole body without boundary lines by adopting rubber roller printing comprises the following steps:
after a green body is molded, polishing the surface of the green body by using a sponge material;
secondly, after the polished green body is subjected to a drying process, printing white glaze on the surface of the green body by using a rubber roller, and sintering the white glaze at 1100-1200 ℃ to form a white glaze layer of the whole body borderless ceramic tile;
weighing the materials according to the formula, adding 45 wt% of stamp-pad ink, and performing ball milling until the fineness of glaze slip is less than 40 micrometers;
adding a debonder and a stamp-pad ink, adjusting the viscosity of the glaze slip to an En type viscosity for 18-23 seconds, wherein the specific gravity of the glaze slip is 1.53-1.62;
the material of the rubber roller is engraved by adopting an ultra-soft roller, 40-60% gray transparent and uniform file is used for engraving, and 1-3 rubber rollers are used for printing in rubber roller printing;
sixthly, enabling the green bricks printed with the white glaze to enter a multi-channel digital ink-jet printer for surface comprehensive decoration, wherein the multi-channel digital ink-jet printer adopts a combination mode of color ink and functional ink and adopts a low-ink-volume fine spray head for pattern decoration;
after the surface of the product is comprehensively decorated by a digital ink-jet printer, the ink for pattern decoration has infiltration capacity, penetrates a white glaze layer with the thickness of 0.06mm, and the comprehensive decoration layer and a blank have no boundary line visually;
and after the surface of the green brick is comprehensively decorated, applying transparent glaze or spraying protective glaze of lubricating and fine glaze on the surface decoration layer.
The self-skin is sprayed with protective glaze and then enters a roller kiln to be sintered at the sintering temperature of 1100-1200 ℃ for 80-95 minutes, and the whole body borderless ceramic tile product is obtained after polishing and edging.
The preparation method of the ceramic tile without boundary line in the whole body by adopting the flat plate process comprises the following procedures:
after a green body is molded, polishing the surface of the green body by using a sponge material;
secondly, printing white glaze on the surface of the polished green body by adopting a flat plate process after the green body is subjected to a drying process;
weighing the materials according to the formula, adding 45 wt% of water, and performing ball milling until the fineness of glaze slip is less than 40 micrometers;
fourthly, adding a thickening agent and a printing material into the glaze slip, and adjusting the specific gravity of the white glaze material to be 1.32-1.48 so that the performance of the glaze slip is adjusted to meet the requirements of a flat printing process;
controlling the blank temperature to be 38-45 ℃ before printing the white glaze slurry, and adopting 200-mesh all-through pattern screen cloth for the flat screen;
sixthly, enabling the green bricks printed with the white glaze to enter a multi-channel digital ink-jet printer for surface comprehensive decoration, wherein the multi-channel digital ink-jet printer adopts a combination mode of color ink and functional ink and adopts a low-ink-volume fine spray head for pattern decoration;
after the surface of the product is comprehensively decorated by a digital ink-jet printer, the ink for pattern decoration has infiltration capacity, penetrates a white glaze layer with the thickness of 0.06mm, and the comprehensive decoration layer and a blank have no boundary line visually;
after the surface of the green brick is comprehensively decorated, applying transparent glaze or spraying protective glaze of lubricating and fine glaze on the surface decoration layer;
(8.1) for the product protection glaze with a flat surface, a transparent glaze spraying mode is adopted, namely, a linear glaze spraying device is adopted for glazing, the glazing specific gravity is 1.82-1.86, and the glazing amount is 450-700 g/m2The en-type viscosity is 18-25 s;
(8.2) adopting a process of spraying lubricating fine glaze for the archaized brick products, wherein the specific gravity of the glaze is 1.22-1.32, and the glaze amount is 120-200 g/m2The En-type viscosity is 12-18 s.
The self-skin is sprayed with protective glaze and then enters a roller kiln to be sintered at the sintering temperature of 1100-1200 ℃ for 80-95 minutes, and the whole body borderless ceramic tile product is obtained after polishing and edging.
The whole body borderless ceramic tile containing the white glaze consists of a green body decoration layer, a white glaze layer, a comprehensive decoration layer and transparent glaze or a protective glaze layer. Wherein: and the green body decorative layer is decorated by adopting an accurate cloth technology.
Referring to fig. 1, the precise material distribution technique is specifically implemented by a material distribution and pressing system:
this accurate cloth system includes that first cloth is fought 1, second cloth is fought 2, third cloth is fought 3 and is three group's cloth hoppers, and first transition belt 4, second transition belt 5 are totally two sets of transition belts, and first transition hopper 6, second transition hopper 7 are totally two sets of transition hoppers, grid 8, and characteristic texture cloth mechanism 9A, characteristic texture cloth mechanism 9B are totally two sets of lines cloth mechanism, and the frame 10 is stored to the grid, cloth platform 11, pressing mechanism 12 and die frame 13.
Cloth mechanism 9A, 9B and grid store frame 10 are the core of accurate cloth system, can realize pattern characteristic texture decoration through increasing these two equipment, wherein grid store frame 10 is used for storing 1 ~ 8 different grids, and every grid possesses different linear texture. The line distributing mechanisms 9A and 9B can move positions according to the program design, and arrange powder in the grating 8 according to the corresponding pattern of the grating. The grids with the linear texture are returned to the lower parts of the transition hopper 6 and the transition hopper 7 through the material distribution platform, green body powder in the transition hopper is arranged in the grids 8, is strickled off and then is sent to a die frame 13, and is pressed and formed through a pressing mechanism 12. By using the material distribution system according to the method, the pattern characteristic texture blank decoration can be realized, the pattern characteristic texture blank decoration is matched with the ink-jet design texture, and the accurate alignment product is produced.
The above-mentioned embodiments are only preferred embodiments of the present invention, and all equivalent changes and modifications made within the scope of the claims of the present invention should be covered by the claims of the present invention.
Claims (6)
1. The preparation method of the ceramic tile without the boundary line is characterized by comprising the following steps:
after a green body is molded, polishing the surface of the green body by using a sponge material;
secondly, after the blank body which is polished is subjected to a drying process, printing white glaze on the surface of the blank body by using a rubber roll, wherein the white glaze comprises the following raw materials in percentage by weight: 60-75% of an opacifier, 15-28% of an opacification frit and 4-15% of clay; the opacifier is one or a combination of more of tin oxide, zirconium oxide, titanium oxide, cerium oxide and superfine zirconium silicate; the opacification frit adopts one or a combination of more of zirconium white opacification frit, zirconium titanium system opacification frit and phosphorus zirconium composite opacification frit; the white glaze can be used as a white glaze layer of the whole body borderless ceramic tile after being fired at 1100-1200 ℃;
weighing materials of the white glaze according to a formula, adding 45 wt% of printing oil, and performing ball milling until the fineness of glaze slip is less than 40 micrometers;
adding a debonder and a stamp-pad ink, and adjusting the viscosity of the glaze slip to an En-type viscosity of 18-23 seconds, wherein the specific gravity of the glaze slip is 1.53-1.62;
the material of the rubber roller is carved by an ultra-soft roller, 40-60% gray transparent uniform files are carved, and 1-3 rubber rollers are used for printing in rubber roller printing;
thirdly, the green brick printed with the white glaze enters a multi-channel digital ink-jet printer for surface comprehensive decoration, the multi-channel digital ink-jet printer adopts a combination mode of color ink and functional ink, and a low-ink-amount fine spray head is adopted for pattern decoration;
after the surface of the product is comprehensively decorated by a digital ink-jet printer, the ink for decorating the patterns has infiltration capacity, penetrates through a white glaze layer with the thickness of 0.06mm, and the comprehensive decoration layer has no boundary line with the blank in vision;
fifthly, applying transparent glaze or spraying protective glaze of lubricating and fine glaze on the surface decorative layer after the surface comprehensive decoration of the green brick;
sixthly, spraying protective glaze, then, firing in a roller kiln at the firing temperature of 1100-1200 ℃ for 80-95 minutes, and polishing and edging to obtain the whole body borderless ceramic tile product.
2. The method for preparing the ceramic tile without the boundary as claimed in claim 1, wherein the step of fifthly further comprises: the method of spraying transparent glaze is used for product protective glaze with flat surface, namely, a linear glaze spraying device is adopted for glazing, the glazing specific gravity is 1.82-1.86, and the glazing amount is 450-700 g/m2The En-type viscosity is 18-25 s.
3. The method for preparing the ceramic tile without the boundary as claimed in claim 1, wherein the step of fifthly further comprises: for the archaized brick products, a process of spraying lubricating fine glaze is adopted, the glazing specific gravity is 1.22-1.32, and the glazing amount is 120～200g/m2The En-type viscosity is 12-18 s.
4. The preparation method of the ceramic tile without the boundary line is characterized by comprising the following steps:
after a green body is molded, polishing the surface of the green body by using a sponge material;
secondly, after the green body which is polished is subjected to a drying process, printing white glaze on the surface of the green body by adopting a flat plate process, wherein the white glaze comprises the following raw materials in percentage by weight: 60-75% of an opacifier, 15-28% of an opacification frit and 4-15% of clay; the opacifier is one or a combination of more of tin oxide, zirconium oxide, titanium oxide, cerium oxide and superfine zirconium silicate; the opacification frit adopts one or a combination of more of zirconium white opacification frit, zirconium titanium system opacification frit and phosphorus zirconium composite opacification frit;
weighing materials of the white glaze according to a formula, adding 45 wt% of water, and performing ball milling until the fineness of glaze slip is less than 40 micrometers;
adding a thickening agent and a printing material into the glaze slip, and adjusting the specific gravity of the white glaze material to 1.32-1.48 so as to adjust the performance of the glaze slip to meet the requirements of a flat printing process;
the blank temperature is controlled to be 38-45 ℃ before printing the white glaze slip, and a 200-mesh full-through pattern mesh is adopted for the flat screen;
thirdly, the green brick printed with the white glaze enters a multi-channel digital ink-jet printer for surface comprehensive decoration, the multi-channel digital ink-jet printer adopts a combination mode of color ink and functional ink, and a low-ink-amount fine spray head is adopted for pattern decoration;
after the surface of the product is comprehensively decorated by a digital ink-jet printer, the ink for decorating the patterns has infiltration capacity, penetrates through a white glaze layer with the thickness of 0.05mm, and the comprehensive decoration layer has no boundary line with the blank in vision;
fifthly, applying transparent glaze or spraying protective glaze of lubricating and fine glaze on the surface decorative layer after the surface comprehensive decoration of the green brick;
sixthly, spraying protective glaze, then, firing in a roller kiln at the firing temperature of 1100-1200 ℃ for 80-95 minutes, and polishing and edging to obtain the whole body borderless ceramic tile product.
5. The method for preparing the ceramic tile without the boundary as claimed in claim 4, wherein the step of fifthly further comprises: the method of spraying transparent glaze is used for product protective glaze with flat surface, namely, a linear glaze spraying device is adopted for glazing, the glazing specific gravity is 1.82-1.86, and the glazing amount is 450-700 g/m2The En-type viscosity is 18-25 s.
6. The method for preparing the ceramic tile without the boundary as claimed in claim 4, wherein the step of fifthly further comprises: for the archaized brick products, a process of spraying lubricating fine glaze is adopted, the glazing specific gravity is 1.22-1.32, and the glazing amount is 120-200 g/m2The En-type viscosity is 12-18 s.
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