JPH0818303B2 - Casting method for colored ceramic plate - Google Patents

Description

TECHNICAL FIELD The present invention relates to a casting method for a ceramic plate with a color pattern.

[Prior Art] Recently, large-scale colored ceramic plates with colored patterns are attached to the inner and outer walls and the ceiling to enhance the aesthetic appearance of buildings.

Such a ceramic plate with a color pattern has hitherto been
It is formed by a method called “dry pressing method” in which a mixed powder material of a coloring material and a base material is piled up and filled in a lower die for press forming and then pressed. However, this method has a problem that it is not possible to form an intentionally colored pattern and it is difficult to form a large-sized ceramic plate. Therefore, recently, a casting method using an apparatus as shown in FIG. 9 has been proposed and partially put into practical use (Japanese Patent Laid-Open No. 1-218803). In this method, three types of colored sludge injection channels 2, 3, 4 with different colors are connected in the middle of the base slurry casting channel 1, and each colored slurry injection port 2, 3, 4, By press-fitting an appropriate amount of colored slurry from 4 and forcibly mixing it into the base slurry, a color pattern in which the base slurry and the colored slurry are mixed well in the cavity 5 is generated. is there. In the figure, 6, 7 and 8 are storage tanks for storing different colored sludges, 9 is a casting port, 10 is an upper mold, and 11 is a lower mold. The surface of the molded article thus obtained,
As shown in FIG. 10, along with the flow from the casting port 9, a colored pattern in which the colored slurry draws a stripe pattern in the base slurry is formed.

[Problems to be Solved by the Invention]

However, in the above method, the flow of the base slurry and the colored slurry changes depending on the arrangement of the casting port 9, and the color pattern formed therewith also changes. Therefore, in order to change the pattern of the color pattern, it is necessary to prepare molding dies having different positions of the spouts 9 one by one, which is troublesome and costly. Therefore, as a method capable of freely changing the color pattern, a method has been proposed in which a color pattern is previously applied to the inner surface of the upper mold and the base slurry is cast into the mold. There is a problem that it is necessary to lower the casting pressure so that the color pattern in the upper mold does not flow and collapse during casting, which requires a long molding time.

The present invention has been made in view of such circumstances,
It is an object of the present invention to provide a molding method of an excellent ceramic plate with a color pattern, which can easily change the color pattern using the same molding die and has no deformation of the color pattern obtained even when the casting pressure is high. To do.

[Means for solving the problem]

In order to achieve the above object, the cast molding method of the colored patterned ceramic plate of the present invention is a step of preparing a pair of upper and lower casting molds in which a casting opening is opened in the center of the shaping recess of the lower mold, A mixing step of mixing a plurality of different types of colored sludge in a mixing drum with a stirring blade to form a color pattern,
In the lower mold of the casting mold, a step of pouring the color pattern slurry in the mixing drum, and after tightening the step and the upper mold, the base slurry is cast from the casting port of the lower mold and the color pattern slurry in the mold. And a cast molding step of integrally molding the base slurry.

[Action]

That is, the present invention does not form a color pattern to be given to a ceramics plate in a molding die as in the conventional case, but previously forms a color pattern by mixing plural kinds of colored sludge in a mixing drum. The pattern mold is filled in the lower mold at a specified ratio, and after the mold is clamped, the base mold is cast from the casting opening provided in the center of the lower mold, and the colored pattern mold is pushed up from the bottom to the top. is there. According to this cast molding method, the color pattern sludge is lifted upward without being deformed by the base sludge flowing from the casting port, so that the patterned surface of the color pattern sludge in the lower mold is It will be pressed against the inner surface of the upper mold as it is. Therefore, if this is removed from the mold, a molded product having a color pattern formed on the surface is obtained, and a ceramic plate with a color pattern is obtained by firing. In this cast molding method, in order to change the color pattern, the color pattern can be easily changed only by changing the order of introducing the colored slurry into the mixing drum, the stirring conditions, and the like. Further, even if the base slurry is cast under high pressure, the effect of uniformly pushing up the color pattern slurry is not impaired, so that the color pattern is not deformed. Therefore, it is possible to obtain a molded product in a short time by high-speed casting.

Next, the present invention will be described in detail based on examples.

〔Example〕

FIG. 1 shows an example of the mixing drum used in the present invention. In the figure, 20 is a bottomed cylindrical mixing drum in which a stirring blade 21 is mounted. Further, an opening 22 with an opening / closing shutter (not shown) is provided at one location on the bottom surface of the mixing drum 20, and a shutter 23 extends obliquely downward from the opening 22. 24, 25, and 26 are colored sludge charging nozzles, which supply three kinds of colored sludges A, B, and C having different colors, respectively. Therefore, in the mixing drum 20, the above three colored sludge charging nozzles 24, 2
The colored slurry A, B, C is put in an appropriate order from 5, 26 and stirred by the stirring blade 21 to form a color pattern in which the three colors A, B, C are mixed. Then, the opening 22 at the bottom is opened, and the color pattern slurry is introduced from the shutter 23 into the lower mold 31 of the casting mold as follows.

The casting mold used in the present invention, as shown in FIG.
It is composed of an upper mold 30 and a lower mold 31, and the upper mold 30 is moved up and down by driving a hydraulic cylinder (not shown). In the center of the recess of the lower mold 31, the casting port 32
Is opened and communicates with a material supply pipe 34 extending from a material supply source (not shown) via a flow path 33.

The mixing drum 20 is arranged so as to be able to advance and retreat with respect to the casting mold, and the tip of the shutter 23 is inserted between the upper mold 30 and the lower mold 31 in a state where it has advanced toward the casting mold. There is. In this state, the color pattern sludge 40 obtained by mixing in the mixing drum 20 is made to flow down from the shower 23 and is filled in the concave portion of the lower mold 31. At this time, the filling amount is preferably 60 to 85% of the inner volume of the lower mold 31. . That is, if the filling amount is less than the above range, the inflow amount of the base slurry during casting increases,
The influence of the flow on the color pattern slurry 40 increases and the shape tends to collapse. On the contrary, if the filling amount is larger than the above range, the inflow amount of the base sludge during casting becomes small and the molding becomes insufficient. After the lower mold 31 is filled with the colored pattern slurry 40 in this way, the mixing drum 20 is retracted to remove the shutter 23 from the space between the upper and lower molds 30 and 31. Upper mold 30 in this state
Lower the mold and clamp the mold. As shown in FIG.
The base slurry 41 is cast from 32, and the moisture of the color pattern slurry 40 and the base slurry 41 is absorbed on the inner surfaces of the upper mold 30 and the lower mold 31 to integrally form the color pattern slurry 40 and the base slurry 41 in the mold. At this time, as shown in FIG. 4, the base slurry 41 lifts up the color pattern slurry 40 while spreading in the left-right direction in the mold. Next, this is released from the mold, and as shown in FIG. 5, a base portion 41 'derived from the base slurry 41 is flat and wide inside the color pattern portion 40' derived from the color pattern slurry 40. Goods are obtained. Therefore, if this molded product is fired, a ceramic plate with a color pattern can be obtained.

Therefore, according to this molding method, the colored pattern slurry 40,
Because the base sludge 41 flowing in from the casting port 32 can be lifted upward without changing its shape,
The patterned surface of the pattern in the lower mold 31 is pressed against the inner surface of the upper mold 30 as it is to form the color pattern of the molded product. Therefore, when the colored pattern slurry 40 is filled in the lower mold 31, the finished state of the colored pattern can be predicted. Then, in order to change the pattern of the color pattern, the colored slurry A in the mixing drum 20,
It is only necessary to change the order of charging B and C, the stirring conditions, etc., and the color pattern can be easily changed. Further, by repeating the normal rotation and the reverse rotation of the stirring blade 21, it is possible to generate a finer color pattern. Further, even if the baze sludge 41 is cast at a high pressure, the color pattern of the color pattern sludge 40 is not deformed, so that it is possible to perform the molding in a short time by the high pressure casting.

Each of the colored sludges A, B, C and the base sludge 41 used in the present invention may be any conventionally known one, but it is preferable to use one having a similar shrinkage ratio during firing. . That is, if the firing shrinkage ratios of the two are remarkably different from each other, fine voids or cracks may occur at the boundary between the base portion and the color pattern portion after firing.

Further, the type of colored slurry may be any number as long as it is two or more. And, any of the colored sludge may be the same as the baze sludge.

Further, in the present invention, at the stage of filling the color pattern sludge 40 from the mixing drum 20 into the lower mold 31, a pattern hollow plate 45 as shown in FIG. The colored slurry D may be put in and the pattern of the colored slurry D conforming to the hollowed pattern may be dropped. By doing this, as shown in FIG. 7, on the surface of the fine color pattern,
A large pattern P can be attached, and a colored ceramic plate with a design with a stronger impression can be obtained.

Alternatively, at the stage of filling the lower mold 31 with the colored pattern slurry 40 from the mixing drum 20, as shown in FIG. 8, a sieve 47 containing the colored ground ceramic material 46 is placed above the lower mold 31, When the sieve 47 is vibrated so as to be sprayed on the surface of the color pattern sludge 40, the base sludge 41 is cast in the same manner as in the above embodiment to obtain a molded product in which the color pattern and the spot pattern are combined. You can

〔The invention's effect〕

As described above, the method for forming a colored patterned ceramic plate of the present invention is to form a colored pattern by mixing a plurality of types of colored sludge in a mixing drum in advance, and the colored pattern sludge is appropriately mixed in the lower mold. After the mold is clamped and the mold is clamped, the base slurry is cast from a casting opening provided at the center of the lower mold to push the colored pattern slurry from the bottom to the top for molding. Therefore, according to this casting method, the color pattern sludge is lifted upward without being deformed by the base sludge flowing from the casting port, so that the color pattern sludge in the lower mold is The patterned surface will be pressed against the inner surface of the upper mold as it is. By doing this, if you demold it,
A molded product having a color pattern formed on the surface is obtained, and a ceramic plate with a color pattern is obtained by firing. Further, in this cast molding method, in order to change the color pattern, it suffices to change the order of introducing the colored slurry into the mixing drum, the stirring conditions, etc., and the color pattern can be easily changed.
Moreover, even if the baize sludge is cast under high pressure, the uniform pushing up effect of the color pattern sludge is not impaired, so that the color pattern is not deformed. Therefore, it is possible to obtain a molded product in a short time by high-speed casting.

[Brief description of drawings]

FIG. 1 is a perspective view showing an example of a mixing drum used in the present invention, and FIGS. 2, 3, 4, and 5 are explanatory views showing an embodiment of the molding method of the present invention, and FIG. Fig. 7 is a pattern hollow plate used in another embodiment of the present invention, Fig. 7 is a plan view of a ceramics plate obtained by using the above hollow plate, Fig. 8 is an explanatory view of still another embodiment, and Fig. 9 is a conventional drawing. FIG. 10 is an explanatory view of a method for forming a colored ceramic plate having a color pattern, and FIG. 10 is a plan view of a ceramic plate obtained by the method. 20 …… Mixing drum, 21 …… Stirring blade, 24,25,26 …… Colored sludge charging nozzle, 30 …… Upper mold, 31 …… Lower mold, 32 …… Sinking port, 40 …… Color pattern sludge, 41 …… Base sludge

Claims (1)

[Claims] 1. A step of preparing a pair of upper and lower casting molds in which a casting port is opened in the center of a shaping recess of a lower mold, and a plurality of kinds of colored sludge of different colors are mixed in a mixing drum with a stirring blade. Mixing step to form a color pattern, in the lower mold of the casting mold, the step of pouring the color pattern slurry in the mixing drum, and after tightening the lower mold and the upper mold, from the casting port of the lower mold A method for casting a ceramic plate with a color pattern, comprising: casting the base slurry and molding the color pattern slurry in a mold and the base slurry integrally.