1. A production process of arc-edge glazed ceramic tiles is characterized by comprising the following steps:

s1, edging: conveying the ceramic tile into an edge grinding device for edge grinding to obtain the ceramic tile with arc edges;

s2, drying: feeding the arc-edge ceramic tile obtained in the step S1 into a quick drying device for drying, wherein the quick drying device comprises a plurality of hot air devices parallel to the conveying direction of the ceramic tile, and hot air sent out by the hot air devices is aligned to the arc edge of the ceramic tile and forms an angle of 30-60 degrees with the upper surface of the ceramic tile;

s3, arc edge glazing: sending the dried ceramic tile into a glazing device to spray glaze on the arc edge, wherein the glazing device comprises a plurality of spray heads arranged along the conveying direction of the ceramic tile, the plane where the spray nozzles of the spray heads are located and the upper surface of the ceramic tile form an angle of 10-60 degrees to spray the glaze, the ceramic tile is firstly cured after being subjected to primary glaze spraying, then is continuously conveyed to be subjected to secondary glaze spraying, and finally is subjected to secondary curing to obtain the arc edge glaze ceramic tile.

2. The process of claim 1, wherein step S2 is preceded by the steps of: the arc-edge tile surface is wiped and/or cold air dried during the conveying process.

3. The process of claim 1, wherein step S2 further comprises offsetting the curved edge tile to be fed into the flash dryer so that the curved edge of the curved edge tile remains parallel to the direction of conveyance.

4. The process for producing a curved-edge glazed ceramic tile according to claim 1, wherein the temperature of the hot air from the hot air device in step S2 reaching the curved edge of the tile is 40-100 ℃.

5. The process for producing arc-edged glazed ceramic tiles as claimed in claim 1, wherein the water content of the arc edges of the ceramic tiles subjected to rapid drying in step S2 is controlled to be less than or equal to 0.6%.

6. The process of claim 1, wherein step S3 further comprises correcting the position of the arc-edged tile to be fed to the glazing device so that the relative positions of the arc edges of all the arc-edged tiles and the nozzle are consistent.

7. The process for producing a curved-edge glazed ceramic tile as claimed in claim 1, wherein the glaze in step S3 is a photosensitive glaze or a heat-sensitive glaze, and the primary curing and the secondary curing are UV light curing or heat curing.

8. The process for producing a curved-edge glazed ceramic tile according to claim 1, wherein the primary curing is performed perpendicular to the curved edge of the tile and the secondary curing is performed parallel to the curved edge of the tile in step S3.

9. The process for producing arc-edged glazed ceramic tiles as claimed in claim 1, wherein in step S3, the primary glaze spraying is carried out by using 1-2 nozzles, and the secondary glaze spraying is carried out by using 3-6 nozzles.

10. A curved-edge glazed ceramic tile, characterized by being produced by the production process according to any one of claims 1 to 9.

Background

The ceramic tile is an acid and alkali resistant building or decorative material such as porcelain or stone formed by grinding, mixing, pressing, glazing and sintering refractory metal oxide and semimetal oxide, and is called as a ceramic tile; the raw materials are mostly mixed by clay, quartz sand and the like. The arc-edge ceramic tile is a ceramic tile which enables corner structures, wall corners, stairs and other angular structures of house buildings to be changed into curved shapes, has a simple structure and a novel design, not only eliminates the angular structures of the ceramic tile, but also avoids the phenomena of accumulated water, dirt accumulation and the like, so that the cleaning and the cleaning are very convenient, the construction is convenient, the decorative effect is good, and the practicability is outstanding.

In the production process of arc limit ceramic tile, need carry out the edging to glazed whole ceramic tile and obtain the ceramic tile arc limit, if directly use after the edging, then can cause the easy long-pending dirty, difficult problem of clearance of this arc limit because of the glaze layer protection. Glazing the arc edge of the ceramic tile can well solve the problem. The existing arc-edge ceramic tile has the problems that the arc edge has a certain radian, glaze is difficult to be uniformly distributed on the surface of the arc edge, glazing is not uniform due to insufficient arc edge drying, and finally the arc-edge ceramic tile is poor in protection effect and not attractive.

Disclosure of Invention

The invention aims to overcome at least one of the defects of the prior art and provide a production process capable of uniformly and effectively spraying glaze on the arc edge of a ceramic tile, so that the arc edge ceramic tile with good protection effect and attractive appearance is obtained. The purpose of the invention is realized based on the following technical scheme:

in one aspect, the invention provides a production process of arc-edge glazed ceramic tiles, which comprises the following steps:

s1, edging: conveying the ceramic tile into an edge grinding device for edge grinding to obtain the ceramic tile with arc edges;

s2, drying: feeding the arc-edge ceramic tile obtained in the step S1 into a quick drying device for drying, wherein the quick drying device comprises a plurality of hot air devices parallel to the conveying direction of the ceramic tile, and hot air sent out by the hot air devices is aligned to the arc edge of the ceramic tile and forms an angle of 30-60 degrees with the upper surface of the ceramic tile;

s3, arc edge glazing: sending the dried ceramic tile into a glazing device to spray glaze on the arc edge, wherein the glazing device comprises a plurality of spray heads arranged along the ceramic tile conveying direction, the spray nozzles of the spray heads are matched with the arc edge in shape, the plane where the spray nozzles are located and the upper surface of the ceramic tile form an angle of 10-60 degrees for glazing, the ceramic tile is firstly cured after being subjected to primary glazing, then is continuously conveyed to be subjected to secondary glazing, and finally is subjected to secondary curing, so that the arc edge glazed ceramic tile is obtained.

Preferably, step S2 is preceded by: and in the conveying process, the surfaces of the arc-edge tiles are dried by cold air by using an air cooling device.

Preferably, step S2 further includes offsetting the arc-edged tiles about to enter the quick drying device so that the arc edges of the arc-edged tiles remain parallel to the conveying direction.

Preferably, the arc limit ceramic tile is located hot air device's opposite one side and is equipped with the tuningout device, the tuningout device is including transferring to the section and aligning the section, it is 5 ~ 30 contained angles setting with hot air device to transfer to the section, align section and hot air device parallel arrangement, transfer to the section and align the section all include a plurality of rotation axes and use the rotation axis is the gyro wheel of central rotation.

Preferably, the temperature of the hot air sent by the hot air device in the step S2 reaching the arc edge of the tile is 40-100 ℃.

Preferably, the water content of the arc edge of the ceramic tile after the rapid drying is controlled to be less than or equal to 0.6 percent in the step S2.

Preferably, step S3 further includes correcting the positions of the arc-edge tiles about to enter the glazing device so that the relative positions of the arc-edges of all the arc-edge tiles and the nozzle are consistent.

Preferably, be equipped with position calibrating device before the glazing device, position calibrating device is including the fixed parallel correction board that sets up in conveyer belt one side, the parallel correction board lower surface is connected with a plurality of correction wheels through the pivot, the parallel correction board top still is provided with the correction support that spanes the conveyer belt setting, be equipped with thrust unit on the correction support, thrust unit includes drive arrangement and the distance rod who is connected with drive arrangement, the distance rod is installed through the connecting piece with the parallel removal correction board of parallel correction board, removal correction board lower surface is connected with a plurality of removal correction wheels through the pivot, just the removal correction board can be at thrust unit's drive down along direction of transfer's vertical direction round trip movement to make the arc limit ceramic tile carry out position correction under the mating action of correction wheel and removal correction wheel.

Preferably, the thrust device is a cylinder telescopic device, a hydraulic cylinder telescopic device or an electric telescopic device.

Preferably, be equipped with a plurality of guide rails on the correction support, the lower surface of guide rail is equipped with a plurality of sliders, the lower surface of slider is connected and is removed the correction board, slider and guide rail phase-match just can be on the guide rail round trip movement.

Preferably, the glaze in step S3 is a photosensitive glaze or a heat-sensitive glaze, and the primary curing and the secondary curing are UV light curing or heat curing.

Preferably, the primary curing is performed perpendicular to the arc edge of the tile in step S3, and the secondary curing is performed parallel to the arc edge of the tile.

Preferably, in the step S3, the primary glaze spraying is performed by using 1-2 nozzles, and the secondary glaze spraying is performed by using 3-6 nozzles.

In another aspect of the invention, the arc-edged glazed ceramic tile is prepared by the production process.

The invention can obtain at least one of the following beneficial effects:

1. according to the invention, arc edges of the ceramic tiles are pertinently, quickly and efficiently dried, and then the arc edges of the ceramic tiles are glazed, so that the adhesion effect of the glaze layer on the ceramic tiles can be improved, and the obtained arc edge glaze layer is stable and does not fall off glaze. Utilize the air-out end in little wind channel to form the hot-blast of great wind speed during the stoving, and be certain angle with the ceramic tile arc limit, realized drying the ceramic tile arc limit fast accurately, reduced manufacturing cost simultaneously. In the glazing process, the spray head and the arc edge of the ceramic tile form a certain angle, and glaze can be sprayed on the arc edge accurately; through twice glaze spraying and twice curing, the glaze layer can be cured in time, glazing is uniform and has no omission, and the problem of poor protection effect caused by nonuniform glaze layer due to flowing or local aggregation of glaze sprayed on the arc edge can be prevented. The arc-edge glazed ceramic tile has the advantages of uniform, smooth and stable glaze layer, beautiful appearance, good protection effect, dirt accumulation prevention and easy cleaning.

2. The drying process, the glazing process and the conveying process are simultaneously carried out, so that extra waiting time is not needed, and the production efficiency is improved.

3. The primary curing is performed perpendicular to the arc edge of the ceramic tile, so that the shaping and curing of the glaze in the vertical direction are accelerated, the secondary curing is performed in parallel with the arc edge of the ceramic tile, and the secondary glaze spraying uses a plurality of spray heads, so that the secondary curing is performed in parallel, the coverage area is wide, and the shaping and curing of the glaze in the horizontal direction can be accelerated; the invention improves the stability and uniformity of the glaze layer.

4. The invention has convenient operation, high production efficiency and good product quality, and can be applied to industrialized large-scale production.

Drawings

FIG. 1 is a flow chart of a process for producing arc-edged glazed ceramic tiles according to a preferred embodiment of the present invention;

FIG. 2 is a schematic structural diagram of a rapid drying device according to a preferred embodiment of the present invention;

FIG. 3 is a schematic structural view of a hot air device according to a preferred embodiment of the present invention;

FIG. 4 is a schematic structural view of a glazing device according to a preferred embodiment of the present invention;

fig. 5 (a) is a schematic diagram of a structure of a correction plate according to a preferred embodiment of the present invention, and (b) is a schematic diagram of a structure of a movable correction plate;

fig. 6 is a schematic structural view of a thrust device according to a preferred embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1 to 6, the apparatus used in the arc-edged glaze tile production process according to the preferred embodiment of the present invention includes an edging device (not shown), a quick drying device 100 and a glazing device 200. The edge grinding device can adopt the existing edge grinding device with hydraulic dust removal. The rapid drying device 100 comprises a plurality of hot air devices 101 parallel to the conveying direction of the ceramic tiles, each hot air device 101 comprises a rack and a shell 102 arranged on the rack, one end of each shell 102 is provided with an air inlet end 103, the other end of each shell 102 is provided with an air outlet end 108, and an air channel of each air outlet end 108 is of a gradually-reduced structure so as to form a narrow air outlet; an air supply device and an electric heating element 109 are arranged in the shell 102, the air supply device comprises a motor 104 and a rotary fan blade 106 arranged on a motor shaft 105 of the motor 104, and the electric heating element 109 is connected with the motor 104. The motor 104 is started to rotate to drive the rotating fan blade 106 to rotate, air is driven to enter the shell from the air inlet end 103, then the air is heated under the heating action of the electric heating element 109 to become hot air, and finally the hot air is discharged at a large air speed through the air outlet end 108 of the small air channel, so that the arc edge of the ceramic tile is accurately and efficiently dried. Wherein, air supply arrangement is preferred to be located and is close to air inlet end 103 department, and electric heating element 109 is preferred to be located and is close to air outlet end 108 department, and it is effectual to form hot-blast, and the temperature that the hot-blast that hot-blast device 101 sent out reachs the ceramic tile arc limit is 40 ~ 100 ℃. The opposite side of the hot air device 100 is provided with an offset adjusting device 110, which comprises a direction adjusting section 112 and an aligning section 111, wherein the direction adjusting section 112 and the conveying direction form an included angle of 150-175 degrees, the aligning section 111 and the conveying direction are arranged in parallel, and the direction adjusting section 112 and the aligning section 111 both comprise a plurality of rotating shafts 113 and rollers 114 rotating by taking the rotating shafts 113 as centers; during the conveying process, the rollers 114 are in contact with the side edges of the tiles to rotate, the tiles continuously pass through the rollers 114 of the direction adjusting section 112 to be adjusted to the direction parallel to the conveying direction, and under the action of the rollers 114 of the aligning section 111, the direction is kept, so that the arc edges of the tiles are aligned in parallel with the air outlet end 108 to be dried.

The glazing device 200 comprises a horizontally disposed conveyor and an inkjet glazing device 205 provided with one side of the conveyor. The conveying device comprises a conveying belt 201, a driving roller 202, a driven roller 203 and a motor 204, wherein the conveying belt 201 is arranged around the driving roller 202 and the driven roller 203, and the driving roller 202 is connected with a motor shaft of the motor 204; referring to the direction shown in fig. 3, the inkjet glazing device 205 comprises a first spray head 206, a first curing device 208, a second spray head 207 and a second curing device 209 which are sequentially arranged along the conveying direction of the conveyor belt 201 from right to left, wherein the number of the first spray head 206 is 1-2, the number of the second spray head 207 is 3-6, the plane where the nozzles of the spray heads are located is perpendicular to the arc edge and is glazed with the upper surface of the ceramic tile at an angle of 10-60 degrees, the first curing device 208 is perpendicular to the arc edge of the ceramic tile, and the second curing device 209 is parallel to the arc edge of the ceramic tile. Wherein the glaze can use photosensitive or heat-sensitive glaze, and accordingly, the first curing device 208 and the second curing device 209 are photo-cured or heat-cured. A position calibration device 210 is further arranged above the conveyor belt 201 and comprises a parallel correction plate 211 fixedly arranged on one side of the conveyor belt 201, and the lower surface of the parallel correction plate 211 is connected with a plurality of correction wheels 213 through a first rotating shaft 212; a correction bracket 214 arranged across the conveyor belt 201 is further arranged above the parallel correction plate 211, a thrust device 215 is arranged on the correction bracket 214 and comprises a driving device 221 and a thrust rod 222 connected with the driving device 221, the thrust rod 222 is provided with a moving correction plate 216 parallel to the parallel correction plate 211 through a connecting piece, and the lower surface of the moving correction plate 216 is connected with a plurality of moving correction wheels 218 through a second rotating shaft 217. The correcting bracket 214 is provided with a plurality of guide rails 219, the lower surface of the guide rails 219 is provided with a plurality of sliding blocks 220, the lower surface of the sliding blocks 220 is connected with the movable correcting plate 216, the sliding blocks 220 are matched with the guide rails 219 and can move back and forth on the guide rails 219, namely, the movable correcting plate 216 can move back and forth on the guide rails 219 along the direction vertical to the conveying direction under the driving of the thrust device 215, so that the arc-edge tiles can be subjected to position correction under the cooperation action of the correcting wheels 213 and the movable correcting wheels 218. The thrust device can be a cylinder telescopic device, a hydraulic cylinder telescopic device or an electric telescopic device.

The device is adopted to glaze the arc edge of the ceramic tile, and the specific method comprises the following steps:

a production process of arc-edge glazed ceramic tiles comprises the following steps:

s1, edging: conveying the ceramic tile into an edge grinding device for edge grinding to obtain a ceramic tile with arc edges, and treating generated dust by using water and a dust hood in the edge grinding process;

s2, drying:

s21, firstly, wiping the surface of the arc-edge ceramic tile obtained in the step S1 with sponge or cotton cloth or the like, or installing a roller such as sponge or cotton cloth above a conveyer belt, wherein the distance between the roller and the conveyer belt is slightly smaller than the thickness of the ceramic tile, so that the surface of the ceramic tile is wiped in the conveying process; then, using an air cooler to carry out cold air drying on the surface of the arc-edge ceramic tile;

s22, feeding the arc-edge tiles into a quick drying device for drying, wherein in the conveying process, rollers 114 are in contact with the side edges of the tiles to rotate, the tiles continuously pass through a plurality of rollers 114 of a turning section 112 to be adjusted to the direction parallel to the conveying direction, the direction is kept under the action of the rollers 114 of an alignment section 111, so that the arc edges of the tiles are aligned with an air outlet end 108 in parallel for drying, hot air sent out from the air outlet end 108 is aligned with the arc edges of the tiles and forms an angle of 30-60 degrees with the upper surfaces of the tiles, the temperature of the sent hot air reaching the arc edges of the tiles is 40-100 ℃, and the water content of the dried arc edges of the tiles is controlled to be less than or equal to 0.6%;

s3, arc edge glazing:

s31, carrying out position calibration on the dried ceramic tiles, when the ceramic tiles run to the position calibration device 4, retracting the driving device 451 to retract the thrust rod 452 to enable the movable correction wheel 48 to contact the side edge of the ceramic tiles, pushing the ceramic tiles to move to the contact correction wheel 43 under the retracting action of the thrust rod 452, carrying out position calibration on the ceramic tiles under the cooperation action of the ceramic tile correction wheel 43 and the movable correction wheel 48, meanwhile, in the forward conveying process of the conveyor belt, the correction wheel 43 and the movable correction wheel 48 rotate, and the ceramic tiles can be conveyed forward continuously;

s32, continuously conveying the calibrated ceramic tile forwards, enabling the ceramic tile to enter a glazing device to spray glaze on arc edges, enabling the ceramic tile to pass through a first spray head 206, enabling a plane where a spray nozzle is located to form an angle of 10-60 degrees with the upper surface of the ceramic tile to be aligned with the arc edges to spray glaze, enabling the ceramic tile to pass through a first curing device 208 to be cured for the first time after being subjected to primary glaze spraying, then continuously conveying the ceramic tile to a second spray head 207 to be subjected to secondary glaze spraying, enabling the angle of the spray nozzle to be the same as that of the primary glaze spraying, and finally performing secondary curing through a second curing device 209 to obtain the arc edge glaze ceramic tile, wherein the glaze can be photosensitive glaze or thermosensitive glaze and correspondingly cured into UV photocuring or heating curing; the primary curing is carried out perpendicularly with ceramic tile arc limit, and the frit is at the design solidification of vertical direction with higher speed, and the secondary curing goes on with ceramic tile arc limit parallel, because of the secondary glaze spraying uses a plurality of shower nozzles, so the secondary curing is carried out in parallel, and area coverage is wide, can accelerate the glaze at the design solidification of horizontal direction to the stability and the homogeneity on glaze layer have been improved.

The following are specific examples.

Example 1

Other steps in this embodiment are the same as those in the above specific method, except that:

step S21, wiping the surface of the arc-edge ceramic tile obtained in the step S1 with sponge, and then drying the surface of the arc-edge ceramic tile with cold air by using an air cooler;

step S22: hot air sent out by the air outlet end 108 is aligned with the arc edge of the ceramic tile and forms an angle of 30 degrees with the upper surface of the ceramic tile for drying, the temperature of the sent hot air reaching the arc edge of the ceramic tile is 43 +/-2 ℃, and the water content of the arc edge of the dried ceramic tile is controlled to be less than or equal to 0.6%;

step S32: the plane where the nozzles of the first spray head 206 and the second spray head 207 are located and the upper surface of the ceramic tile form an angle of 10 degrees and are aligned with the arc edge for glaze spraying, 1 first spray head 206 is arranged, and 3 second spray heads 207 are arranged; the frit may be a photosensitive frit and the first curing device 208 and the second curing device 209 are UV light curing devices. Example 2

Other steps in this embodiment are the same as those in the above specific method, except that:

step S21, firstly, wiping the surface of the arc-edge ceramic tile obtained in the step S1 by cotton cloth, and then drying the surface of the arc-edge ceramic tile by cold air through an air cooler;

step S22: hot air sent out by the air outlet end 108 is aligned with the arc edge of the ceramic tile and forms an angle of 40 degrees with the upper surface of the ceramic tile for drying, the temperature of the sent hot air reaching the arc edge of the ceramic tile is 95 +/-0.5 ℃, and the water content of the arc edge of the dried ceramic tile is controlled to be less than or equal to 0.6%;

step S32: the plane where the nozzles of the first spray head 206 and the second spray head 207 are located and the upper surface of the ceramic tile form an angle of 60 degrees and are aligned with the arc edge for glaze spraying, 1 first spray head 206 is arranged, and 4 second spray heads 207 are arranged; the frit may be a photosensitive frit and the first curing device 208 and the second curing device 209 are UV light curing devices.

Example 3

Other steps in this embodiment are the same as those in the above specific method, except that:

step S21, installing rollers such as sponge or cotton cloth above the conveyer belt, wherein the distance between the rollers and the conveyer belt is slightly smaller than the thickness of the ceramic tile, so that the surface of the ceramic tile is wiped dry in the conveying process; then, using an air cooler to carry out cold air drying on the surface of the arc-edge ceramic tile;

step S22: hot air sent out by the air outlet end 108 is aligned with the arc edge of the ceramic tile and forms an angle of 60 degrees with the upper surface of the ceramic tile for drying, the temperature of the sent hot air reaching the arc edge of the ceramic tile is 60 +/-1 ℃, and the water content of the arc edge of the dried ceramic tile is controlled to be less than or equal to 0.5%;

step S32: the plane where the nozzles of the first spray head 206 and the second spray head 207 are located and the upper surface of the ceramic tile form a 20-degree angle to be aligned with the arc edge for glaze spraying, 2 first spray heads 206 are arranged, and 6 second spray heads 207 are arranged; the frit may be a heat sensitive frit and the first curing device 208 and the second curing device 209 are heat curing devices.

Example 4

Other steps in this embodiment are the same as those in the above specific method, except that:

step S21, installing rollers such as sponge or cotton cloth above the conveyer belt, wherein the distance between the rollers and the conveyer belt is slightly smaller than the thickness of the ceramic tile, so that the surface of the ceramic tile is wiped dry in the conveying process; then, using an air cooler to carry out cold air drying on the surface of the arc-edge ceramic tile;

step S22: hot air sent out by the air outlet end 108 is aligned with the arc edge of the ceramic tile and forms an angle of 50 degrees with the upper surface of the ceramic tile for drying, the temperature of the sent hot air reaching the arc edge of the ceramic tile is 70 +/-1 ℃, and the water content of the arc edge of the dried ceramic tile is controlled to be less than or equal to 0.5%;

step S32: the plane where the nozzles of the first spray head 206 and the second spray head 207 are located and the upper surface of the ceramic tile form an angle of 50 degrees and are aligned with the arc edge for glaze spraying, 2 first spray heads 206 are arranged, and 5 second spray heads 207 are arranged; the frit may be a heat sensitive frit and the first curing device 208 and the second curing device 209 are heat curing devices.

Example 5

Other steps in this embodiment are the same as those in the above specific method, except that:

step S21, installing a roller such as sponge or cotton cloth above the roller conveyor belt, wherein the distance between the roller and the conveyor belt is slightly smaller than the thickness of the ceramic tile, so that the surface of the ceramic tile is wiped dry in the conveying process; then, using an air cooler to carry out cold air drying on the surface of the arc-edge ceramic tile;

step S22: hot air sent out by the air outlet end 108 is aligned with the arc edge of the ceramic tile and forms an angle of 45 degrees with the upper surface of the ceramic tile for drying, the temperature of the sent hot air reaching the arc edge of the ceramic tile is 80 +/-0.5 ℃, and the water content of the arc edge of the dried ceramic tile is controlled to be less than or equal to 0.6%;

step S32: the plane where the nozzles of the first spray head 206 and the second spray head 207 are located and the upper surface of the ceramic tile form an angle of 30 degrees and are aligned with the arc edge for glaze spraying, 1 first spray head 206 is arranged, and 4 second spray heads 207 are arranged; the frit may be a photosensitive frit and the first curing device 208 and the second curing device 209 are UV light curing devices.

Example 6

Other steps in this embodiment are the same as those in the above specific method, except that:

step S21, installing rollers such as sponge or cotton cloth above the conveyer belt, wherein the distance between the rollers and the conveyer belt is slightly smaller than the thickness of the ceramic tile, so that the surface of the ceramic tile is wiped dry in the conveying process; then, using an air cooler to carry out cold air drying on the surface of the arc-edge ceramic tile;

step S22: hot air sent out by the air outlet end 108 is aligned with the arc edge of the ceramic tile and forms an angle of 35 degrees with the upper surface of the ceramic tile for drying, the temperature of the sent hot air reaching the arc edge of the ceramic tile is 75 +/-0.5 ℃, and the water content of the arc edge of the dried ceramic tile is controlled to be less than or equal to 0.5%;

step S32: the plane where the nozzles of the first spray head 206 and the second spray head 207 are located and the upper surface of the ceramic tile form an angle of 45 degrees and are aligned with the arc edge for glaze spraying, 1 first spray head 206 is arranged, and 5 second spray heads 207 are arranged; the frit may be a heat sensitive frit and the first curing device 208 and the second curing device 209 are heat curing devices.

Comparative example 1

The procedure of step S22 was changed to 80 ℃ drying room, and the procedure was as in example 5.

Comparative example 2

The step S22 is changed to be dried in a drying room at 80 ℃, and the step S32 is carried out by using only the second nozzle 207 and the second curing device 209 for glaze spraying and curing once, and the rest is the same as the example 5.

Comparative example 3

The step S22 is changed to be dried in a drying room at 80 ℃, and the step S32 is performed with glaze spraying and curing only once by using the first nozzle 206 and the first curing device 208, and the rest is the same as the example 5.

Comparative example 4

Step S22 was changed to 80 ℃ drying room and step S32 second curing device 209 was set perpendicular to the curved edge of the tile, the rest was the same as example 5.

Comparative example 5

The step S22 is changed to 80 ℃ drying room for drying, and the first and second nozzles 206 and 207 perform glaze spraying in a direction perpendicular to the upper surface of the tile in the step S32, which is the same as that of the embodiment 5.

The performance of the arc edge glaze layers of the arc edge glaze tiles obtained in examples 1 to 6 and comparative examples 1 to 4 was measured, and the results are shown in table 1. (the detection methods are GB/T3810.11-2016, GB/T3810.14-2016 and GB/T3810.13-2016 respectively)

TABLE 1

	Surface topography	Resistance to cracking of glazed tiles	Stain resistance	Resistance to chemical corrosion
					Standard requirements	Smooth glaze layer without defects	No glaze crack after test	Lowest grade 3	Not less than GB grade
Example 1	Meets the requirements	Meets the requirements	Grade 5	GA level
					Example 2	Meets the requirements	Meets the requirements	Grade 5	GA level
Example 3	Meets the requirements	Meets the requirements	Grade 5	GA level
					Example 4	Meets the requirements	Meets the requirements	Grade 5	GA level
Example 5	Meets the requirements	Meets the requirements	Grade 5	GA level
					Example 6	Meets the requirements	Meets the requirements	Grade 5	GA level
Comparative example 1	Uneven and flawless glaze	Slight crack of glaze	4 stage	GB grade
					Comparative example 2	Uneven and flawless glaze	Small amount of glaze crack	Grade 3	GB grade
Comparative example 3	Unevenness and slight glaze shortage	More glaze cracks	Grade 3	GC stage
					Comparative example 4	Uneven and slight glaze shortage	Small amount of glaze crack	Grade 3	GB grade
Comparative example 5	Unevenness and slight glaze shortage	More glaze cracks	Grade 3	GC stage

(Note: the degree of glaze shortage is ranked as few glaze shortage > slight glaze shortage > no glaze shortage, and the degree of glaze cracking is ranked as more crack > few crack > slight crack.)

As is clear from the data in Table 1, the arc edge glaze layer of the arc edge glaze ceramic tile obtained by the invention is flat and free of defects, and has excellent performances such as excellent glaze cracking resistance, stain resistance and chemical corrosion resistance. Compared with comparative examples 1-5, the quick drying (comparative example 1), the glazing and curing times (comparative examples 2 and 3), the glazing angle (comparative example 5) and the curing angle (comparative example 4) all have influence on the performance of the arc edge glaze layer, especially the quick drying has larger influence on the glaze cracking resistance, the pollution resistance and the chemical corrosion resistance, and the secondary glazing and curing and the glazing angle have larger influence on the flatness, the glaze cracking resistance, the pollution resistance and the chemical corrosion resistance of the glaze layer.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.