JPH08133869A - Production of dry powder and printed tile - Google Patents

Abstract

PURPOSE: To produce a printed tile by filling a dried glaze powder in a recess on the surface of an endless belt, dropping the powdery glaze on the surface of an unbaked tile body on a tile transfer path, closely contacting the powder to the tile body by spraying water mist and baking the product. CONSTITUTION: A glaze slurry composed mainly of clay, feldspar, pigment, etc., is granulated and dried by a spray drier, etc., to prepare dried glaze powder having a water-content of <=1% and particle diameter of <=250μm. An endless belt 1 having recesses 3 on the surface to form a prescribed continuous pattern is circulated, the dry powder 4 is supplied from a hopper 2 and transferred in a state filled in the recess 3 and excess powder is removed by a squeegee 5 in the middle of the transfer path. The dry powder 4 is dropped from an end of the endless belt 1, supplied to the surface of an unbaked tile body 6 moving under the endless belt and sprayed with fine water mist to effect the close contact of the dry powder 4 to the unbaked tile body 6. The product is subjected to main baking to obtain the objective printed tile having a continuous pattern with desired hue.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a print tile in which a dry powder filled and held in a concave portion of an endless belt surface is supplied to a surface of a tile green body in a non-contact manner, and the powder is brought into close contact with water and fired. The present invention relates to a method of manufacturing.

[0002]

2. Description of the Related Art Usually, when a print tile is manufactured, the tile green body after pressure molding is bisqued at a temperature of about 800 to 1100 ° C. to increase a predetermined strength and water absorbency. Then, a mask is placed on the surface of the tile unglazed base material, paint is placed on it, and is scraped out with a squeegee, and the paint of the thickness of the mask is applied to the surface of the tile unglazed base material. That is, a predetermined pattern is formed by applying paint to the surface of the tile unglazed base material by screen printing. After that, a glaze is applied if necessary and the product is printed to obtain a print tile.

[0003]

As described above, in the conventional method for producing a print tile by screen printing, it is inevitable that the tile unglazed base and the mask come into contact with each other. Therefore, the tile unglazed base material needs to have a certain level of strength that is not damaged or scratched by the pressing force when the paint is scratched by the mask and the squeegee. It could not be used as it was, and it was necessary to unglazed it.

Further, since unglazed baking is indispensable, a calcination process therefor is required, which requires heat energy for bisquering line and calcination, and further there is a drawback that productivity is poor.

Further, in the method using screen printing, if the surface of the tile unglazed base material has irregularities such as a relief pattern, a large amount of paint is applied to the recesses, and the surface after application becomes smooth. Therefore, the conventional print tile manufacturing method using screen printing has a drawback that a relief pattern is not formed.

[0006]

SUMMARY OF THE INVENTION The present invention has been made by improving and removing the above problems in view of the above-mentioned conventional problems. It is intended to provide a method for producing a print tile which can be applied regardless of whether it is a tile raw material or a relief pattern.

In order to solve the above-mentioned problems, the present invention adopts the technique of claim 1 in which a glaze sludge containing clay, feldspar, pigment or the like as a main raw material is granulated with a spray dryer and dried to contain water. The powder has a rate of 1% or less and a particle size of 250 μm or less.

The technique of claim 2 adopted by the present invention is
On the surface, an endless belt formed with a recess for filling and holding dry powder is arranged above the tile transport path,
By driving in a state where the concave portion on the surface of the endless belt is filled and held with the dry powder, the dry powder is dropped and supplied to the surface of the tile green body passing on the tile conveying path from the front end surface of the endless belt, and is atomized. Water is applied to bring the dry powder into close contact with the tile green substrate, and then baked.

Furthermore, the technique of claim 3 adopted by the present invention is
As in the case of claim 2, a mask in which the dry powder is dropped and supplied onto the surface of the tile green substrate by an endless belt, and subsequently, a dry powder of a different color from the dry powder is filled above the tile green substrate. Is placed on the surface of the tile green body with a squeegee and sprayed with mist-like water to bring the two dry powders into close contact with the tile green body, and then fired.

[0010]

According to the invention described in claim 1, the glaze slurry is granulated by a spray dryer and dried to have a water content of 1% or less and a particle size of 2
The powder is 50 μm or less. By limiting the water content and the particle size in this way, a powder having excellent fluidity can be obtained, and the powder can be dropped and supplied from the endless belt. The dry glaze powder obtained in this way is obtained from glaze sludge, and the glaze sludge can be mixed in any desired color, so that a dry powder having a desired color can be obtained.

According to the second aspect of the invention, the dry powder thus obtained is filled into the pattern forming recess provided in the endless belt, and the endless belt is applied to the surface of the tile green body. It is falling and supplying. Then, by spraying water, the dry powder is attached to the surface of the tile and fired. By dropping and supplying from the endless belt, it is possible to obtain a continuous pattern pattern, which is excellent in productivity.

Further, according to the invention of claim 3, in addition to the dry powder supplying technology by the endless belt of the invention of claim 2, a mask arranged at a position separated from the tile green body by a predetermined distance is provided. Another dry powder having a different color from the dry powder is filled and scraped off with a squeegee or the like.

Since the two types of dry powder scraped off on the surface of the tile green substrate are not yet in close contact with the tile green substrate at this stage, mist-like water is sprayed on the dry powder. Then, it may be fired at the end.

According to the method of the present invention, since it is a non-contact type, the dry powder of glaze can be directly applied to the tile green body immediately after pressure molding, and the existing tile production line can be used as it is. It is possible to consistently perform from pressure molding to firing.

In addition, even if the surface of the tile green substrate is provided with relief patterns or the like, the relief pattern can be used as it is to form a print pattern, and a relief pattern print tile can be manufactured. It is possible.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The manufacturing method of the present invention will be described below with reference to the embodiments shown in the drawings. First, a first embodiment of the present invention will be described. In the first embodiment, dry powder of glaze is manufactured by a spray dryer method, and the powder is dropped and supplied onto the surface of the tile green body by using an endless belt, and then baked to manufacture a print tile. I have to.

The production of the dry glaze powder is carried out in the same manner as in the case of producing a normal glaze slurry by putting a glaze raw material mainly containing clay, feldspar, pigment, etc. into a mill and finely grinding it. Get glaze slurry. Therefore, it is possible to mix colors arbitrarily, and it is possible to obtain a desired shade.

After that, the glaze slurry thus produced is granulated and dried by a spray dryer. The spray dryer used in this example uses a spray dryer different from the spray dryer that forms a normal kneaded clay, so that fine particles and a water content that cannot be obtained by a spray dryer that forms a normal kneaded clay can be obtained. I am trying to get

For reference, in the spray dryer method for forming ordinary kneaded clay, a hot air outlet is arranged at the upper part of the dryer main body, and the glaze slurry is directed upward from below the dryer main body. By spraying, the ejected particles are once blown up and fall to the discharge port below. Therefore, the time during which the ejected sludge particles are suspended in the dryer body becomes long, and as a result, the particles grow by adhering to each other and have a size of 80 to 1000 μm and a water content of 3 to 10 μm.
It will be% of kneaded clay.

However, with this water content and size, the fluidity of the particles is poor, and it is impossible to drop and supply the dry powder of glaze from the endless belt. Therefore, in the present embodiment, the hot air outlet is arranged in the upper part of the dryer main body, and by spraying the glaze sludge laterally from the upper part of the dryer main body, there is an opportunity for particles to come into contact with each other in the dryer main body. I am less.

This makes it possible to suppress the growth of particles and reduce the water content, and to obtain a glaze dry powder having a particle size of 250 μm or less and a water content of 1% or less. Such a dry powder has excellent fluidity of particles and can be easily dropped and supplied from the endless belt.

In the first embodiment, the dry powder of glaze produced as described above is prepared and supplied to the hopper 2 of the endless belt 1 as shown in FIG. . The endless belt 1 has a concave portion 3 formed on the surface so that a predetermined continuous pattern is obtained, and the dry powder 4 of glaze supplied from the hopper 2 is conveyed while being filled in the concave portion 3. During the process, the squeegee 5 removes the excess.

The dry powder 4 of glaze which is filled in the concave portion 2 and conveyed is dropped from the end portion of the endless belt 1 and supplied to the surface of the tile green body 6 conveyed below. In this state, the dry powder is not yet in close contact with the tile green body. Therefore, if the tile green substrate 6 is moved as it is, the dry powder 4 of the glaze will be scattered or the pattern shape of the pattern will be scattered and scattered, so spray fine mist-like water on the surface of the tile green substrate 6, Dry glaze powder 4
To be closely attached to the tile green body 6.

After that, a transparent glaze may be applied to the surface of the tile green body 6 if necessary, and the main firing may be performed. This allows
It is possible to produce a print tile that can obtain a continuous pattern in any hue by firing once.

Next, a second embodiment of the present invention will be described.
In this second embodiment, the dry powder 4 of glaze is supplied to the surface of the tile green body 6 in the same manner as in the case of the first embodiment. Next, the separately produced dry powder is layered and supplied to the surface of the tile green substrate 6, and then fine water in a mist state is sprayed to bring the dry powder into close contact with the surface of the tile green substrate. I try to get a two-color print tile.

As the dry powder of a color different from that of the glaze dry powder of the first embodiment, the raw material particles of the glaze are finely pulverized, and the powder is coated with a resin material that disappears during firing. The reason for applying the resin coating is to impart a surface property and slipperiness to the dry powder itself of the glaze, that is, to impart fluidity. Then, the resin-coated glaze raw material particles are sieved and passed through a 225 mesh to remove angular particles and take out only round particles. Furthermore, the size of the particles actually used is
It is assumed to pass 180 mesh. this is,
This is to prevent clogging of the squeegee during actual use.

Next, by the endless belt 1 of the first embodiment, a mask is arranged at a predetermined height above the tile green body 6 to which the dry powder 4 manufactured by the spray dryer is supplied. Then, the dry powder of glaze coated with resin as described above is put in this mask, and this is scraped off with a squeegee. As a result, the dry glaze powder coated with the resin is sprinkled on the surface of the tile green body 6 in a desired pattern shape while being non-contact with the tile green body 6.

In this state, since the dry powder 4 produced by the spray dryer and the resin-coated dry powder are not in close contact with the tile green body 6, the procedure is the same as in the case of the first embodiment. , Fine water is sprayed on the surface of the tile green body 6 so that the dry powder of two types of glaze is adhered to the tile green body 6.

After that, a transparent glaze may be applied to the surface of the tile green body 6 if necessary, and the main firing may be performed. At the time of this main firing, the resin material coated on the surface of the glaze particles of the dry powder disappears.

As a result, a multi-colored print tile in which a continuous pattern of the dry powder 4 shown in FIG. 1 and a pattern of different colors of the resin-coated dry powder are superposed and printed is obtained. Since it is a non-contact type print, printing is possible even when unevenness such as a relief pattern is formed on the surface of the tile green substrate 6.

By the way, the present invention is not limited to the above-mentioned embodiments, but can be appropriately modified. For example, the resin-coated glaze dry powder used in the second embodiment may be used as a mixture of a plurality of types, or may be divided into several times to form print patterns of different types and patterns. May be.

In the second embodiment, instead of the dry powder of the glaze coated with resin, the dry powder produced by the spray dryer method of the first embodiment is printed in a non-contact manner using a mask and a squeegee. You may do it. Needless to say, multicolor printing can be performed by repeating the printing method of the first embodiment several times.

Further, as the dry powder of the glaze of the first and second embodiments, it is possible to use any glaze such as matte glaze and bright glaze. Furthermore, the transparent glaze applied to the tile surface is for the purpose of protecting the surface and preventing adhesion of dirt, and can be omitted.

[0034]

As described above, the dry powder of the present invention is obtained by granulating glaze slurry by a spray dryer method,
It is dried to have a water content of 1% or less and a particle size of 250 μm or less. Due to this limitation, a dry powder of glaze having excellent fluidity can be obtained, which can be dropped and supplied by an endless belt, and a continuous pattern can be easily formed. Moreover,
Since the glaze slurry is manufactured by the spray dryer method, it is possible to easily mix any hue and it is possible to manufacture a print tile having a desired pattern.

Further, since it is a non-contact type pattern print, it can be directly printed on the tile green body immediately after pressure molding, and there is no need to unglazed the tile green body as in the conventional case. Therefore, there is no need for calcination equipment or steps for unglazed baking, and it is possible to perform integrated production from pressure molding to continuous calcination by an existing tile production line, which is extremely excellent in productivity.

Further, since the printing method of the present invention is a non-contact type, printing can be performed even when unevenness such as a relief pattern is formed on the tile surface, and either a smooth tile or a relief pattern tile can be printed. Even in this case, it is possible to manufacture a print tile.

[Brief description of drawings]

FIG. 1 is a perspective view showing a process of manufacturing a print tile according to a first embodiment of the present invention.

[Explanation of symbols]

 1 ... endless belt 2 ... hopper 3 ... recessed endless belt 4 ... dry powder 5 ... squeegee 6 ... tile green substrate

Claims (4)

[Claims] 1. A water content of 1 is obtained by granulating and drying a glaze sludge containing clay, feldspar, pigment, etc. as a main raw material with a spray dryer.
% Dry powder having a particle size of 250 μm or less. 2. An endless belt having a concave portion for filling and holding dry powder on the surface is arranged above a tile conveying path, and the concave portion on the surface of the endless belt is filled and held with dry powder. By driving in the state, the dry powder is dropped and supplied from the front end surface of the endless belt to the surface of the tile green base that passes on the tile transport path, and the dry powder is applied to the tile green base by spraying mist-like water. A method for producing a print tile, which comprises firing and then firing. 3. An endless belt having a concave portion for filling and holding dry powder on the surface is arranged above a tile conveying path, and the concave portion on the surface of the endless belt is filled and held with dry powder. By driving in the state, the dry powder is supplied by dropping from the front end surface of the endless belt to the surface of the tile green substrate passing on the tile transport path, and then, above the tile green substrate, a different color from the dry powder. Place a mask filled with the dry powder of the above, scrape it on the surface of the tile green substrate with a squeegee, sprinkle mist-like water to make the two types of dry powder adhere to the tile green substrate, and then burn it. A method for producing a characteristic print tile. 4. A method for producing a print tile, wherein the dry powder is scraped off the surface of the tile green substrate by a mask and a squeegee by the number of required colors.