JPH06134718A - Laminated ceramic plate and manufacture thereof - Google Patents

Abstract

PURPOSE:To enhance various function of a laminated ceramic plate, prevent a defect such as a deformation come from feerning and provide a method for manufacturing the same with an advantageous production cost and a high efficiency. CONSTITUTION:Aqueous slurry A and aqueous slurry B which contain inorganic powder and fibrous substance and have different mixture composition are provided, being stored in tanks 1-3 or 4 according to mixture types, and filtered concentrates are manufactured on cylinder molds 5a in cylinder type wet paper making machines installed in the respective tanks. An endless annular bent 6 to be driven contact with the concentrates is provided, a plurality of the filtered concentrates are sequentially temporarily mounted on a surface of the belt, and further wound on a making roll 9. After this laminated web 8 is pressure molded, it is dried, backed, and manufactured to form a laminated ceramic plate made of a plurality to different ceramic layers.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to interior and exterior materials for construction,
The present invention relates to a general-purpose laminated ceramic plate used as a heat insulating material and a method for manufacturing the same.

[0002]

2. Description of the Related Art Generally, it is known to use a papermaking method of papermaking technology as a method for producing a ceramic plate.
In this case, a slurry of a mixture of an inorganic powder and an organic material, which is a raw material of ceramics, is made by a Fourdrinier paper machine or a round net papermaking machine to obtain a raw ceramic plate having a desired thickness, which is then fired. There is.

The ceramic plate thus manufactured is a single layer or a multi-layer by stacking the same material so as to obtain a desired plate thickness.

[0004]

However, since the ceramic plate obtained by the above-mentioned manufacturing method is composed of a single composition, a green body (green body) having all the required functions is composed of one kind of composition. Ceramics plate), and if various properties such as bending strength, molding shrinkage, and low deformability during firing are required for such a ceramics plate, an adverse effect will occur with the improvement of one function. ,
No highly functional product that satisfies all requirements was obtained.

For example, in order to obtain a ceramic plate having a plate thickness of 8 mm or more, it is necessary to add a large amount of pulp as a fibrous substance in order to increase the rigidity, but the large amount of pulp is burned during firing in the manufacturing process. Therefore, there is a problem that the amount of deformation of the product increases.

Further, in order to increase the bending strength of the ceramic plate, it is preferable to increase the mixing ratio of feldspar among the inorganic substances, but in this case as well, the shrinkage factor during firing becomes large and the product is deformed. There is a point.

The present invention solves the above-mentioned problems, improves the various functions of the laminated ceramics plate, and can prevent the adverse effects such as deformation caused by firing, and in that case, the production cost can be reduced. It is an object of the present invention to provide a highly efficient and efficient manufacturing method.

[0008]

In order to solve the above-mentioned problems, in the present invention, a laminated ceramic plate in which a plurality of ceramic layers containing an inorganic powder and a fibrous substance and having different compounding compositions are stacked and fired and integrated into one body. That is the structure adopted.

Further, the laminated ceramics plate has two or more kinds of aqueous slurries containing inorganic powder and a fibrous substance and having different compounding compositions, accommodated in tanks for each compounding type, and installed in each tank. A filter web is formed on a round net by a round net wet papermaking machine, and then a plurality of the filter concentrates are sequentially temporarily attached to the surface of an endless annular belt driven in contact with these filter concentrates to form a laminated web. To form
This laminated web can be manufactured by pressure-forming, drying and firing.

The details will be described below.

First, as the inorganic powder used in the present invention, those commonly used as a raw material for so-called ceramic plates can be used without particular limitation. As such a raw material, for example, a natural raw material, wollastonite ( Wollastonite), siliceous materials such as silica stone and sand, clay minerals such as wax, kaolin and montmorillonite, so-called feldspar materials such as porcelain stone and feldspar, slaked lime, quick lime,
Examples of calcareous raw materials such as carbide and cement, or synthetic raw materials include metal oxides such as alumina, carbides, and nitrides.

The fiber material used in the present invention includes pulp, asbestos and other mineral fibers, glass fibers,
Examples include carbon fibers, whiskers such as silicon carbide, and ceramic fibers.

The aqueous slurry used in the present invention is prepared by preparing these raw materials in two or more different blending compositions. The blending ratio is 50 to 90% by weight of inorganic powder,
A range of 50 to 2% by weight of fibrous material is preferred. When the amount of the fibrous substance added is more than 50% by weight, the sintered density of the inorganic powder becomes coarse when fired, and the fired body becomes a porous body having low strength. On the other hand, if the amount is less than 2% by weight, the inorganic powder cannot be sufficiently captured at the time of papermaking, and in this case also, a porous fired body with low strength is not preferable.

The water content in such an aqueous slurry is preferably in the range of 800 to 1000 parts by weight when the total amount of the inorganic powder and the fibrous material is 100 parts by weight.
This is because when the water content is less than 800 parts by weight, the viscosity of the slurry is high and the amount of coating on the endless annular belt made of felt is small, and when the water content is more than 1000 parts by weight, the viscosity becomes too low. This is because the deposited amount is small and it becomes difficult to form a layer.

The above-mentioned aqueous slurries are respectively stored in a plurality of tanks. When four tanks are installed, the aqueous slurries having two kinds of compositions are prepared,
One slurry may be contained in one to three tanks and the other slurry may be contained in the remaining tanks. The order of the slurries to be laminated and the components thereof are not particularly limited, and a desired ceramic plate to be manufactured is prepared. Prepare according to function.

Needless to say, various additives may be added to the above-mentioned aqueous slurry as long as the effects of the present invention are not impaired. When a polymer flocculant such as an amphoteric surfactant is added to the aqueous slurry, the inorganic powder is coagulated and adsorbed on the surface of a fiber substance such as pulp,
Since aggregate flocs are formed, more precise papermaking can be performed. Further, in order to obtain a ceramic laminate having a more dense surface, PH of the slurry, selection and combination of the aggregating agent and other additives, water content, and wire mesh # of the papermaking machine are selected.

The laminated web formed on the endless annular belt by the round net type wet papermaking machine is then pressure-molded. The molding pressure in this case is 60 to 250 kgf / cm.
^{About 2} is preferable. At a low pressure of less than 60 kgf / cm ² , the product does not have the required mechanical strength, and 250 kgf / c
This is because a high pressure exceeding m ² is not preferable because it destroys the constituent materials.

[0018]

The laminated ceramic plate according to the present invention has a single composition because a plurality of ceramic layers having different composition can be prepared so as to have different functions and complement the functions of other layers. Like a ceramic plate,
It is possible to prevent the adverse effect that one function is enhanced and the other function is degraded.

Further, in the method for producing a laminated ceramic plate, the composition of the raw materials is adjusted so that the aqueous slurry contained in each tank has each function. Therefore, the filtered concentrate produced in each tank is sequentially transferred to an endless annular belt to form a laminated web, and the laminated web is pressure-molded, dried and fired to obtain a laminated ceramic plate having physical properties of each layer. Complementary and complementary to the extremely high functionality. Further, according to the manufacturing method consisting of the above continuous steps, the production efficiency is good, and the characteristics required for the ceramic plate can be easily changed only by changing the mixing ratio of the aqueous slurry stored in the tank. It is possible to easily adapt to multiple products.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a laminated ceramic plate and a method for manufacturing the same according to the present invention will be described below with reference to the drawings.

As shown in FIG. 1, the example is a method for producing a laminated ceramic plate using an aqueous slurry composed of two kinds of composition, which is one of four tanks.
3 to 3, an aqueous slurry A composed of a mixture of 10 parts by weight of Portland cement, 15 parts by weight of wollastonite, 5 parts by weight of feldspar, 20 parts by weight of alumina, 30 parts by weight of wax, 20 parts by weight of pulp, and 800 parts by weight of water. Are housed.

The remaining tank 4 contains an aqueous slurry B containing a mixture of 15 parts by weight of wollastonite, 35 parts by weight of feldspar, 20 parts by weight of alumina, 30 parts by weight of wax and 800 parts by weight of water. There is.

Then, a cylinder type wet papermaking machine 5 is provided for each of tanks 1 to 4.
Is installed and the circular net 5a is rotated at a speed of 50 m / min to produce a concentrated filtrate on this (outer peripheral surface), and the endless annular belt 6 of the surface felt is used for the concentrated filtrate described above. It was arranged so as to be in contact with, and was rotated in the direction of the arrow in the figure by a separate drive device. The endless annular belt 6 may be made of a non-woven fabric such as felt or a fibrous material such as knitted or woven fabric whose surface or the whole is easily coated with the aqueous slurry, and is not particularly limited to the felt material.

When the endless annular belt 6 is made to go around once, as shown in FIG.
A laminated web 7 is formed by temporarily adhering four layers of concentrated filtered material consisting of the slurry B and the slurry B, and the endless annular belt 6 is further wound around the laminated web 7 to form a total of 8 layers of laminated web 8 (see FIG. 2B).
And the laminated web 8 was wound on a making roll 9.

The laminated web 8 thus obtained has a thickness of 5 mm, a width of 1210 mm and a length of 2420 mm. Then, a pair of upper and lower metal plates are applied to both sides of the laminated web 8 and a molding pressure of 150 kgf / cm ² is applied. Molded.

Next, the water content of this laminated web 8 is 10%.
It is dried so that
It was baked at 50 ° C. for 90 minutes to obtain a laminated ceramic plate. In this case, the temperature distribution was 500 ° C. near the inlet of the continuous firing machine, and 1150 ° C. up to the subsequent outlet.

In order to confirm the physical properties of the obtained laminated ceramic plate, the bending strength was measured by JISA5209 (bending test method for ceramic tiles), and the molding shrinkage ratio (%) in the longitudinal direction before and after firing was determined. Also, the amount of deformation in appearance was observed, and the results are shown in Table 1. Regarding the external deformation, the one with a small warp deformation and satisfactory linearity is marked with a circle, the one with a small warp deformation and almost linearity is marked with a triangle, and one with a warped deformation and unsatisfactory linearity is marked with x. The mark was evaluated in 3 levels.

[0028]

[Table 1]

Comparative Examples 1 to 4 From the same composition as the aqueous slurry A used in the examples, except that the mixing ratio of feldspar was changed to the ratio shown in Table 1 (% by weight of solid content in the aqueous slurry). The resulting aqueous slurry was housed in tanks 1 to 4, and other procedures were performed in exactly the same manner as in the examples to produce laminated ceramic plates.

The same physical property confirmation test as described above was performed on the obtained ceramic plate, and the results are also shown in Table 1.

As is clear from the results shown in Table 1, Comparative Example 1
Bending strength increased as the blending ratio of feldspar increased, but the molding shrinkage and the amount of deformation increased, and bending strength 3
No deformation of 100 kg / cm ² or more was obtained. On the other hand, the bending strength of 300 kg / c was obtained in the example composed of two kinds of laminated bodies in which two kinds of feldspars were mixed.
It was confirmed that the laminated ceramic plate had m ² or more, had a small molding shrinkage, and was not deformed.

[0032]

As described above, according to the present invention, since a plurality of ceramic layers having different composition are stacked and fired and integrated into a laminated ceramic plate, each layer of the plate has different physical properties. There are advantages that various required functions can be enhanced and adverse effects such as deformation during firing can be prevented. In addition, since it is a manufacturing method consisting of continuous steps, it has good production efficiency and is advantageous in production cost, and it is easy to obtain products that meet the required characteristics. It can be said that this is a manufacturing method.

[Brief description of drawings]

FIG. 1A is a manufacturing process diagram schematically showing a manufacturing method of an embodiment, and FIG. 1B is an enlarged view of a tank.

FIG. 2A is a cross-sectional view showing a 4-layer laminated web. FIG. 2B is a cross-sectional view showing an 8-layer laminated web.

[Explanation of symbols]

 A, B Aqueous slurry 1, 2, 3, 4 Tank 5 Round net type wet paper making machine 5a Round net 6 Endless annular belt 7, 8 Laminated web

Claims (2)

[Claims] 1. A laminated ceramic plate comprising a plurality of ceramic layers containing an inorganic powder and a fibrous substance and having different blending compositions, which are stacked and fired and integrated. 2. A reticulated type wet papermaking machine in which two or more kinds of aqueous slurries containing inorganic powder and a fiber substance and having different blending compositions are prepared, housed in tanks of respective blending types, and installed in each tank. Papermaking a filter concentrate on the gauze, and then temporarily depositing the plurality of filter concentrates on the surface of the endless annular belt driven in contact with these filter concentrates in order to form a laminated web, A method for producing a laminated ceramic plate, which comprises press-molding a web, followed by drying and firing.