JPS6331426B2 - - Google Patents

Description

[Detailed description of the invention]

[Industrial Field of Application] The present invention relates to a method for producing interior tiles with dovetail feet that prevent the appearance of wave patterns on the tile surface after glazing. [Prior Art and Its Disadvantages] Generally, it is well known that when it comes to tiles, if a sole is formed on the back side of the tile, a tile with excellent adhesive strength after being attached can be obtained. It is also well known that the adhesive strength is the best when the sole is a dovetail. However, in the case of interior tiles,
Because the wall thickness is about 5 to 6 mm, there is a difference in the press molding pressure applied to the part with the sole and the part without the sole during press molding to make the tile base.
This inevitably appears as a difference in the density of the raw material particles, that is, a difference in the filling rate. For this reason, the size of the gaps (pores) between particles in the above two parts is also different, and the resulting difference in water absorption rate and water absorption rate partially changes the moisture content of the glaze after glazing, causing the tile base to change. The fatal flaw was that a wave pattern appeared on the glaze surface, with areas where soles were present and areas where soles were not. Therefore, in the past, it was common to not form a sole on the back surface of an interior tile. However, in exceptional cases when soles were formed, the pitch of the soles was reduced to disperse and average the concentration of press molding pressure to prevent the appearance of wavy patterns as much as possible. Depending on the method, there are technical limits to reducing the pitch of the sole.
It was not possible to completely prevent the appearance of wave patterns. Moreover, even in this case, it was impossible to make the soles into an ant's foot due to the above-mentioned circumstances. For this reason, conventional interior tiles have not yet had sufficient adhesive strength. In short, in the case of conventional interior tiles, there is a conflict between the technology for forming the sole in order to obtain excellent adhesive strength and the accompanying problem of the appearance of wave patterns, and it is difficult to obtain the former. Then, a problem arose with the latter, and if we tried to solve the latter problem, we could not obtain the former, and it was not possible to obtain something that would solve both contradictory correlations at once. [Means for Solving the Problems] The present invention improves and eliminates the above-mentioned conventional problems, and it is possible to form dovetail feet without creating a wave pattern on the surface of interior tiles. The purpose of the present invention is to provide a method for manufacturing interior tiles that can be manufactured using the following methods. Therefore, the means adopted by the present invention to solve the above-mentioned problems is a method for manufacturing an interior tile in which dovetail feet are formed on an interior tile having a thickness of approximately 5 to 6 mm or less. By press-molding until the average filling rate of particles becomes 0.7 or more in the characteristic curve showing the relationship between the filling rate and press molding pressure of the clay prepared using the clay as the main raw material, the part with dovetails and the ant Between the part with dovetail feet and the part corresponding to the part without dovetail on the surface of the product tile, which has a filling rate deviation of 0.02 or less with respect to the part without feet, and then undergoes processes such as bisque firing, glazing, and firing. This prevents the appearance of wave patterns. [Effect] In the characteristic curve showing the relationship between the filling rate of the main raw material (talc) and the press molding pressure, the average filling rate of particles is
The molded tile base exhibits a low water absorption rate by pressure molding so that it is 0.7 or more, and by making the filling factor deviation between the area with dovetails and the area without dovetails be 0.02 or less. Therefore, there is almost no deviation in water absorption between the part with dovetail feet and the part without dovetail feet, and when glazed, there is no change in the water content of the glaze between the two parts. Therefore, even if a glaze is applied to the tile surface and fired, no wave pattern will appear. [Example] The method for manufacturing an interior tile with dovetail feet according to the present invention will be described below based on an example shown in the drawings. The embodiment of the present invention contains 63% raw talc and 30% feldspar.
% and 7% clay, the main raw material is talc. The relationship between the press molding pressure and the particle filling rate (here, the filling rate refers to 1 - porosity) at this blending ratio is the first
As shown in the figure. In the same figure, talc type refers to the embodiment of the present invention, and feldspar type refers to the conventional case where feldspar is the main raw material. It is clear from FIG. 1 that in the talc-based material of the present invention, the filling rate increases rapidly in the region of low press-molding pressure, and reaches a nearly saturated state at a press-molding pressure of around 300 kg/cm ² . It means that it is becoming. On the other hand, for conventional feldspar-based materials, the filling rate continues to rise slowly as the press molding pressure increases, and reaches a state close to saturation when it exceeds 1000 kg/cm ² . . Furthermore, as long as the above-mentioned characteristics of the present invention are made from talc as the main raw material, almost the same results were obtained even if the blending ratio of the raw materials was changed, so here we will discuss examples of other blending ratios. is omitted. In short, the talc-based material of the present invention has excellent particle orientation and plasticity (characteristics of talc raw materials), so
A high filling rate can be obtained even with extremely low press molding pressure, and it is possible to reduce the water absorption rate by reducing the size of pores formed between particles. Also, the press machine may be small. On the other hand, the relationship between the above-mentioned filling rate and the water absorption rate after bisque firing immediately before glazing is shown in Figures 2 and 3 by comparing the talc-based product of the present invention and the conventional feldspar-based product. As shown. Figure 2 shows the case where the bisque firing temperature is 1040°C, and Figure 3 shows the case where the bisque firing temperature is also 1080°C. It is clear from the figure that the talc-based material of the present invention has a low water absorption rate after bisque firing, and reaches a level when the filling ratio during press forming is 0.7 or more, whereas the talc-based material of the present invention This means that the water absorption rate is high overall and has an approximately linear slope characteristic. Next, with reference to the results shown in FIG. 3, as shown in FIG. 4, with the talc-based clay of the present invention and the conventional feldspar-based clay, the back surface of the tile with a wall thickness of t=4 mm was prepared.
When the tile base 1 is molded with a sole of height h=1 mm, the relationship between the press molding pressure and filling rate of the part A without the sole and the part B with the sole, and the water absorption rate at that time. The incidence of wave patterns will be discussed with reference to Table 1.

【table】

〔Effect of the invention〕

As explained above, in the present invention, a clay prepared using talc as the main raw material is pressurized until the average particle filling rate becomes 0.7 or more to form a tile base with dovetail feet on the back side. By setting the filling rate deviation between the part with dovetail feet and the part without dovetail feet to be 0.02 or less, the deviation in water absorption rate between the part with dovetail feet and the other parts of the unglazed semi-finished product is kept small, and then By performing processes such as glazing and firing, we have prevented the appearance of wave patterns on the tile surface, so it is possible to provide dovetail feet even on extremely thin interior tiles. Therefore, the interior tile manufactured according to the present invention has excellent adhesive strength. In addition, since no wave pattern appears, the tile wall surface becomes beautiful after installation, making it an extremely useful contribution to the technical field of interior tiles. In short, the present invention solves at once the technology of forming dovetail feet on interior tiles to improve adhesive strength, which could not be solved in the past, and the contradictory problem of a wave pattern appearing on the tile surface when dovetails are formed. It is possible to solve this problem.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the relationship between molding pressure and filling rate of talc-based clay according to the present invention and conventional feldspar-based clay;
Figures 2 and 3 show the average filling rate of the tile base and the water absorption rate after bisque firing when a tile base is formed using the talc-based clay according to the present invention and the conventional feldspar-based clay and is bisque fired. FIG. 4 is a longitudinal sectional view showing a tile base with a sole, and FIG. 5 is a longitudinal sectional view of an interior tile according to the present invention. 2... ant legs, 3... interior tiles.

Claims (1)

[Claims] 1. A method for manufacturing interior tiles in which dovetail feet are formed on interior tiles with a thickness of approximately 5 to 6 mm or less, which involves adjusting the filling rate of clay prepared from talc as the main raw material and press molding pressure. By press-forming until the average filling rate of particles becomes 0.7 or more in the characteristic curve that expresses the relationship, the filling rate deviation between the part with dovetail feet and the part without dovetail is 0.02 or less, and then bisque firing and glazing. An interior tile with dovetail feet, characterized in that a wave pattern does not appear between the part with the dovetail feet and the part corresponding to the part without the dovetail feet on the surface of the product tile that has undergone a process such as firing. manufacturing method.