JPH0930874A - Production of ceramic ware and apparatus for treating with binder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve good color-development, efficient burning of binder, reduction of operation cost, reduction of apparatus cost and improvement in the finished appearance by burning out the binder of an underglaze part with radiation of heat rays generated from a ceramic heater. SOLUTION: An unglazed ceramic ware W is produced by burning clay formed to a proper form and an underglaze is applied to the surface of the ceramic ware W by printing or hand-writing with a glaze produced by mixing a pigment such as a metal oxide with an aqueous solution of a binder composed of CMC, ethylene glycol, etc. The ceramic ware W having the underglaze is placed on a bar conveyor 4 of a binder-treating apparatus 1, passed through a heating chamber 3 and irradiated with heat rays by using an electrically heated ceramic heater 5 at about 1300 deg.C for 20-30sec to burn out the binder of the underglaze part. Since the body of the ceramic ware W delivered from the heating chamber 3 by the bar conveyor 4 is heated at 180-250 deg.C in the delivered state, it is forcedly cooled and the ceramic ware W glazed over the whole surface is burnt at a prescribed temperature to obtain the finished product.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a ceramic such as a bowl and a plate, and a binder treating device used in the manufacturing process.

[0002]

2. Description of the Related Art Conventionally, an undercoating step of drawing a rough sketch on a ceramic with a paint in which a binder is mixed with a pigment, a binder treating step of heating the rough sketch portion to burn out the binder, and a binder Japanese Patent Publication No. 3-46420 describes a method of manufacturing a ceramic porcelain, which comprises a finishing step of glazing and burning the burned ceramic. In the binder processing step in this conventional manufacturing method, a nozzle is arranged in the vicinity of a conveyor that conveys ceramics, and a flame is blown from the nozzle to the ceramics to burn out the binder in the rough portion. .

[0003]

The above-mentioned conventional manufacturing method has the following problems because the binder is burned off by blowing a flame onto the ceramics. When a surface of a ceramic is blown with a flame, the binder burns inwards from the surface. Therefore, when the rough sketch is painted in multiple colors, the binder cannot be completely burned out unless the flame spraying time is extended. If the flame spraying time is insufficient and the binder remains, the glaze will flow off only in that part, and the thickness of the glaze layer will be uneven,
Unevenness is created on the surface of ceramics. On the other hand, however, if the flame is blown for a long time, the pottery itself becomes considerably hot, and a cooling device for cooling down to a temperature at which the glazing can be applied becomes bulky, resulting in a high cost. Furthermore, as the flame blowing time becomes longer, the energy consumption also increases, so the operating cost also rises. Incidentally, ceramic patterns tend to become more and more multicolored in the future, and the solution of this problem has become an important technical issue. If a flame is blown to the underpainting part, it may adversely affect the metal oxide of the pigment contained in the paint, and the color may not be beautifully developed. It is fatal that there is such a negative side in the binder treatment process performed to improve the finish of the ceramics. Since the adjustment for efficiently burning out the binder must be performed by adjusting the nozzle position and flame, it is very difficult to control and it is also difficult to maintain the nozzle. Since the heat source is gas or oil, there is a high risk, and once installed, it is not easy to change the layout due to piping and other reasons.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and firstly, a rough painting step of drawing a rough sketch on a ceramic with paint in which a binder is mixed with a pigment, In a method for manufacturing a ceramics, comprising a binder treatment step of heating a rough portion to burn off the binder, and a finishing step of glazing and firing the ceramics burned out of the binder, the binder treatment step Provides a method for manufacturing a ceramic porcelain, which is one in which a radiation heat ray from a ceramic heating element is applied to a background portion to burn out a binder.

Secondly, a heating chamber in which a ceramic is drawn with a paint in which a binder is mixed with a pigment is placed, and a heating chamber arranged so as to face the heating chamber is irradiated with radiant heat rays. Provided is a binder treatment device including a ceramic heating element. In addition, it is preferable that the ceramic heating element can be moved in the direction of the ceramics as the object to be treated.

Radiant heat rays from the ceramic heating element have the property of penetrating into the inside of the object, so that not only the surface of the undercoat portion but also the binder inside can be easily burned off in a short time. Therefore, even if the sketch is painted in multiple colors, the irradiation time of the radiant heat rays may be almost constant, and the temperature rise of the ceramics itself may be small. Further, the radiant heat rays from the ceramic heating element do not adversely affect the metal oxide of the paint, so that good coloration can be obtained even after the binder is burned off.

Furthermore, by making the ceramic heating element of the binder treatment device movable in the direction of the pottery, which is the object to be treated, the clearance between the ceramic heating element and the pottery can be optimally adjusted, and the shape of the pottery can be adjusted. Regardless of this, the binder can always be burned out efficiently.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. 1 is a vertical cross-sectional front view of the binder processing apparatus, and FIG. 2 is a side view showing a part of the binder processing apparatus in section.

1 and 2 show a binder treating apparatus 1. In the binder treatment device 1, a tunnel-type heating chamber 3 is provided in a device base 2, a bar conveyor 4 is provided at the bottom of the heating chamber 3, and a ceramic heating element 5 is further provided at the ceiling of the heating chamber 3. Is provided. The upper and lower sides of the heating chamber 3 are covered with heat insulating materials 6, 6 ... to prevent heat from radiating to the outside. The bar conveyor 4 at the bottom of the heating chamber 3 is formed by arranging metal rods in the shape of a cage and connecting them endlessly, and spanning between the pulleys 7, 7 supported by the device base 2, and the upper linear portion 4L is the transport region. And passes over the upper surface of the heat insulating material 6 on the floor of the heating chamber 3. The bar conveyor 4 is adapted to rotate in the direction shown by the arrow in FIG. 1 when driven by a motor (not shown), and the ceramic W that is the object to be processed is placed on the upper surface and passed through the heating chamber 3.

The ceramic heating element 5 provided in the heating chamber 3 is located at a position where the heat insulating material 6 at the ceiling is divided at the center, and the shaft 8 of the lifting device 8 provided above the device base body 2.
It is supported by a, 8a ... The lifting device 8 is
It is arranged on a support frame 2a that is integral with the device base 2, and is used to move the shafts 8a, 8a ...
The ceramic heating element 5 is moved vertically through the shafts 8a, 8a ....

The lifting device 8 has a ceramic heating element 5
An adjusting device 9 is added to make the clearance of the ceramic ware W appropriate and to enable efficient irradiation of radiant heat rays. That is, the adjusting device 9 includes the shaft 8
horizontal arm 9a integrated with a, 8a ...
a lateral arm 9b provided laterally at the tip of a and the lateral arm 9b
It is composed of optical sensors 9c, 9c which are vertically installed at both ends of, and a fixed set stand 9d which is installed on the upper surface of the device base 2. The vertical distance between the set table 9d and the sensors 9c, 9c is set from the upper surface of the bar conveyor 4 to the ceramic heating element 5.
Shorter than the distance to the bottom of
Moreover, the lowering of the lifting device 8 is set to stop by a detection signal that blocks the light beam X between the sensors 9c and 9c.
Therefore, when the ceramic heating element 5 is moved downward by placing the ceramics W on the setting table 9d, the sensor 9 of the adjusting device 9 is moved.
When the c and 9c detect the ceramics W, the lifting device 8 is stopped. In this state, if the same pottery W placed on the set table 9d is placed on the upper surface of the bar conveyor 4, an appropriate clearance is automatically set between the pottery W and the ceramic heating element 5. Needless to say, the type of the sensor 9c is not limited to the optical type, and for example, a micro switch or the like can be used as the sensor.

Next, a method of manufacturing the ceramics W will be described. First, the green clay which has been formed into an appropriate shape is baked to make a porcelain W in a unglazed state. And on the surface of the ceramic W,
For pigments such as metal oxides, CMC, ethylene glycol,
Draw a rough sketch with paint formed by mixing an aqueous solution of a binder such as starch paste. The drawing method may be either printing or handwriting. Next, the pottery W on which the rough sketch is drawn is placed on the bar conveyor 4 of the binder treatment device 1 and conveyed into the heating chamber 3. Then, the ceramic heating element 5 that is electrically heated
Then, the radiant heat ray of about 1300 ° C. is irradiated for 20 seconds to 30 seconds to burn off the binder in the undercoat part. The irradiation time of the radiant heat rays is adjusted by changing the carrying speed of the bar conveyor 4.

Next, the heating chamber 3 is placed on the bar conveyor 4.
Since the base material temperature of the ceramic porcelain W which has come out is raised to about 180 ° C. to 250 ° C., it is forcibly cooled by a natural or unillustrated cooling device, and then the glaze is applied to the whole. Since the glaze is mixed with a binder similar to the above-mentioned paints, the ceramics W
If the binder remains in the rough sketch, the binder in the glaze does not soak into that part and runs off. However, the radiant heat ray of about 1300 ° C. is 2
By irradiating for 0 to 30 seconds, all the binder in the undercoat is burned off, so that the glaze is well adhered and the whole is made uniform. The porcelain W coated with the glaze in this manner is fired at a predetermined temperature to finish. According to the experiment, the color development of the pigment was better when the binder was burned out than when the binder was not burned out.

Although the present invention has been described with reference to the embodiment, it goes without saying that the present invention is not limited to the above embodiment. For example, although the ceramic heating element 5 is arranged only in the ceiling portion of the heating chamber 3 in the embodiment, the ceramic heating element 5 is installed on the side surface of the heating chamber 3 when there is a sketch on the outer surface such as a bowl or a cup of water. May be. Also, ceramics W
Is conveyed by the bar conveyor 4 in a stationary state, but the ceramics W may be moved in a linear direction while being rotated on the conveyor. By doing so, radiant heat rays can be uniformly emitted. Further, the temperature of the radiant heat ray from the ceramic heating element 5 is not limited to the above, and the binder can be burned out if the temperature is about 900 ° C. or higher. Of course, the lower the temperature, the longer the irradiation time, and the higher the temperature, the shorter the irradiation time.

[0015]

EFFECTS OF THE INVENTION The present invention exhibits the following unique effects by adopting a novel structure in which the radiation heat rays from the ceramic heating element are applied to the undercoat to burn off the binder in the paint. . Radiant heat rays from the ceramic heating element have a property of penetrating into the inside of the object, so that not only the surface of the rough part but also the binder inside can be burned out easily in a short time.
Therefore, even if the sketch is painted in multiple colors, the operating time is low because the irradiation time of the radiant heat rays may be almost constant. Moreover, since the irradiation time of the radiant heat rays may be short, the temperature rise of the ceramics itself is reduced, and a large-scale cooling device is unnecessary. Therefore, the price of the device can be reduced. The radiant heat rays from the ceramic heating element do not adversely affect the metal oxide of the paint, so that the color can be developed neatly even after the binder is burned off. Therefore, the finish of the ceramics is better than that of the conventional device that blows a flame onto the rough part. The adjustment for efficiently burning out the binder is very simple and accurate because the temperature of the ceramic heating element may be electrically controlled, and the maintenance is easy. Since the heat source is electricity, there is no risk of explosion or gas leakage, so safety is high, and since there is no need for piping or exhaust equipment, the layout can be changed easily.

By moving the ceramic heating element in the direction of the pottery, which is the object to be processed, the clearance between the pottery and the ceramic heating element can be properly adjusted, and it is always efficient for various types of pottery. The binder can be burned out.

[Brief description of drawings]

FIG. 1 is a vertical sectional front view of a binder processing apparatus.

FIG. 2 is a side view showing a part of the binder treatment device in section.

[Explanation of symbols]

 W ... Ceramics 1 ... Binder processing device 3 ... Heating chamber 5 ... Ceramic heating element

Claims (3)

[Claims] 1. A process for preparing a rough sketch on a ceramic with a paint in which a binder is mixed with a pigment, a binder treatment process for heating the rough sketch portion to burn out the binder, and a burnout for the binder. In the method of manufacturing a ceramic ware, which comprises a finishing step of glazeing and firing the ceramic ware, the binding agent treatment step is a step of irradiating radiant heat rays from the ceramic heating element to the rough part to burn off the binding agent. A method for manufacturing a ceramics characterized by being present. 2. A heating chamber in which a pottery in which a rough sketch is drawn with a mixture of a pigment and a binder is placed, and a ceramic heat generation which is arranged so as to face the heating chamber and which radiates heat rays to the rough portion of the pottery. A binding agent treatment device comprising a body and a body. 3. The ceramic heating element is movable in the direction of a ceramics as an object to be processed.
The binding agent processing device described.