JP3087559B2 - tile - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tile, and more particularly to a ceramic tile. More specifically, the present invention relates to tiles suitable for interior tiles whose front side is glazed.

[0002]

2. Description of the Related Art An interior tile is a product obtained by firing (unglaring) a molded body of clay or the like made of clay or the like, glazing the unglazed body, and then firing (finished) again. It is manufactured to be tiles.

[0003] This tile is attached to a wall surface using mortar or an adhesive. In order to increase the adhesion of the mortar or the adhesive to the back surface of the tile, a concave portion or a convex portion commonly referred to as a “back foot” (hereinafter, these may be collectively referred to as an uneven portion) is provided on the back surface of the tile. Like that. As a result, the back surface of the tile includes a planar main surface and an uneven portion that is concave or protrudes from the main surface.

In a normal case, the concave and convex portions are recessed or protruded from the surrounding main surface by about 0.2 to 2 mm.

[0005] Figure 2 (a) is a plan view of the back surface of a conventional interior tile 1 provided with the recess 2 as a concavo-convex portion, the second
FIG. 2B is an enlarged sectional view taken along line BB of FIG. The step 2a at the boundary between the recess 2 and the main surface 3 of the tile back surface is linear. Note that one side of the tile 1 is usually 100 mm or more.

By the way, in the unglazing step of the tile manufacturing process, as shown in FIG. 3 , a large number of molded bodies 4 are stacked and fired with their back surfaces facing downward.

[0007]

The present inventors have made various studies, and as shown in FIG. 4 , as shown in FIG. 4, the concave streak 2 of the upper molded body 4 on the front side (upper surface) of the unglazed body 5. At a portion 5a where the main surface 3 hits between the comrades (a portion with a dot in FIG. 4 ), the main surface 3 is pressed by
The sintering reaction is accelerated, and in the unglazed body obtained, this portion 5a is replaced by another portion (a portion where the main surface 3 has not hit. In FIG. 4, it is indicated by a white blank) 5b. Compared to this, it was confirmed that it was slightly dented and had a dense sintered structure.

As described above, when glaze is applied to the unglazed body having different sintering densities in the 5a portion and the 5b portion, it is recognized that the glaze on the dense 5a portion is worse than that on the 5b portion (dense). The more the substrate, the lower the water absorption and the less the amount of glaze attached.)

As described above, if the base material itself is depressed and the glaze is thinly baked in the 5a portion, the product tile is slightly dented on the glaze surface, but the 5a portion becomes a slightly depressed product tile. .

Due to the step between the portions 5a and 5b on the glaze surface, a long streak pattern is generated on the tile surface.

[0011] Such a streak-like pattern on the glaze surface is one of the drawbacks of a tile commonly called a "sole foot pattern" because it is caused by the back foot.

An object of the present invention is to provide a tile in which this "back sole pattern" is inconspicuous.

[0013]

According to the present invention , there is provided a tile in which a rear surface has a flat main surface and a convex portion protruding from the main surface. A high place and a low place gradually recessed from the high place, the convex part is arranged in the low place, and the top surface of the convex part is not protruded from the high place. It is a feature.

[0014]

According to the tile of the present invention , when the clay compacts are stacked and unfired, the high portion of the main surface of the back surface of the compact comes into contact with the surface of the lower compact, and the convex portion is formed. Do not press the surface of another molded body. (In addition, the low point of the main surface is
It is gradually dented from high places, and there is no cliff-like step between high places and low places. As a result, no irregularities or sintering density unevenness due to the uneven soles are formed on the surface of the unfired fired body (unfired body).

Therefore, there is no back footprint on the glaze surface of the product tile.

[0016]

Embodiments will be described below with reference to the drawings .

[0017] In the tile 7 of FIG. 1, the back surface of the main surface 9 consists altitude 9a, depressed portion 9b and the inclined surface 9c, the depressed portion 9
A circular convex portion 16 is provided in b.

The main surface 9 is slightly inward from the periphery of the tile 7.
A high point 9a extending parallel to the peripheral edge at a side portion;
The height gradually decreases from the high point 9a toward the center of the tile 7.
From low point 9b and high point 9a toward the edge of tile 7.
And an inclined surface 9c which becomes lower.

Further, the top surface 16a of the convex portion 1 6 is lower than the altitude 9a. Note that the height 9a and the top surface 16a may be the same height.

The tile 7 is formed by pre-forming the clay into the shape shown in the figure.
Forming, unglazing, then glaze and firing
It is manufactured by

At the time of this unglazing, a plurality of compacts are
It is stacked and fired, but the height of the main surface 9 of the upper molded body is high.
Only the location 9a comes into contact with the upper surface of the lower molded body, and no boundary along the edge 16b is formed on the upper surface of the lower tile, and the back foot pattern is formed by the edge 16b of the top surface 16a. Will not stick .

The main surface 9 has a height 9a to a low 9b.
Since the slope 9c is gradually lowered, the unglazed body
These distinct boundaries on the surface (boundaries due to steps or density differences)
Does not occur. Therefore, the high place 9a, the low place 9b, and the slope 9
No back foot pattern along the border with c is generated.

In the above description, the tile is fired so that the back surface faces down when firing. However, the firing may be performed with the back surface facing upward.

[0024]

As described above, even when tiles of the present invention are fired in an overlapped manner, the sole pattern is not formed at all or hardly noticeable, and the appearance quality is extremely excellent. I have. Also, the production yield is extremely high .

[Brief description of the drawings]

FIG. 1 shows a tile 7 according to an embodiment,
(A) is a sectional view taken along line AA of (b), and (b) is a plan view of the back surface.

FIGS. 2A and 2B show a conventional tile, in which FIG. 2A is a plan view of the back surface, and FIG. 2B is a cross-sectional view taken along line BB of FIG.

FIG. 3 is a cross-sectional view showing a superimposed state during firing of tiles.

FIG. 4 is a perspective view of a conventional unglazed body of a tile.

[Explanation of symbols]

 1,7 Tile 3,9 Main surface 9a High place 9b Low place 9c Inclined surface 16 Convex part

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Wataru Takita 5-1-1 Koiehonmachi, Tokoname-shi, Aichi Inax Corporation (56) References JP-A 5-5980 (JP, U) JP-A 55 174 430 (JP, U) Actual opening 63-125034 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) E04F 13/08-13/18 B28B 3/02

Claims (1)

(57) [Claims] 1. A tile having a back surface composed of a planar main surface and a convex portion protruding from the main surface, wherein the main surface has a height that is high in a direction perpendicular to the back surface; And a low place gradually recessed from the bottom, wherein the convex portion is arranged at the low position, and a top surface of the convex portion is not protruded from the high position.