JP2945613B2 - Glazing method for ceramics - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for glazing ceramics, and more particularly to a method for glazing ceramics with different glazes on its front and back surfaces.

[0002]

2. Description of the Related Art In general, a ceramic layer such as tableware has a glass layer (glaze) having a transparent or various colors on its surface for the purpose of eliminating water absorption, increasing aesthetic effects, and further increasing strength. It is formed. Ceramic glazes that form such glazes have, for example, an appropriate viscosity by dispersing mixed powders obtained by adding various coloring agents as necessary to a base component such as feldspar and a glass component, if necessary. A glaze slurry is prepared, applied to the surface of the unglazed unglazed dough, dried and then fired at a predetermined temperature (hereinafter referred to as main firing) to sinter the unglazed dough and simultaneously melt the glaze to vitrify. It is done by doing.

[0003]

When glazing ceramics, the color and the like of the front and back surfaces of the ceramics may be different from each other. After applying a predetermined first glaze slurry to one side and drying, apply the first glaze slurry to the other side of the front and back surfaces.
A second glaze slurry having a different color or the like from the glaze slurry is applied and dried, and further, the unglazed dough is fully baked at a predetermined firing temperature, and at the same time, the glaze is vitrified.

However, at the edge, which is the boundary between the front and back surfaces of the unglazed dough, if the glaze slurry is to be sufficiently applied to the edge, the glaze slurry is applied to the other surface regardless of which surface is applied. Since the glaze slurry drips, there is a problem that boundaries are disturbed and quality is impaired.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a glaze method for applying different glazes on a front surface and a back surface.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the gist of the present invention is to provide a glaze method for applying different glazes to the front and back surfaces of a ceramic, wherein (a) unglazed unglazed A top edge line forming step of forming a top edge line by applying and curing a top edge line glaze slurry containing a glaze and a curing agent on an edge which is a boundary between the front surface and the back surface of the cloth, (b) a first application step of applying a predetermined first glaze slurry to one of the front surface and the back surface of the unglazed dough on which the top edge line is formed; and (c) the unglazed dough coated with the first glaze slurry. A second application step of applying a predetermined second glaze slurry to the other of the front surface and the back surface.

[0007]

In this way, when glaze is applied to the ceramic, the glaze slurry for the glory line containing the glaze and the hardener is applied to the edge of the unglazed dough and cured in the glory line forming step. A top edge line is formed, a predetermined first glaze slurry is applied to one of the front and back surfaces of the unglazed dough on which the top edge line is formed in the first application step, and further, the first glaze slurry is applied in the second application step. A predetermined second glaze slurry is applied to the other of the front surface and the back surface of the unglazed dough to which the slurry has been applied. Therefore, since the glaze slurry for the top line is applied to the edge of the unglazed dough separately from the front and back surfaces, the first glaze slurry and the second glaze slurry for applying colors to the front and back surfaces are applied to the edge. When the first glaze slurry and the second glaze slurry are applied (hereinafter, simply referred to as a glaze slurry when no particular distinction is required), the glaze slurry for the top line is hardened. Because the top edge line having no water absorption is formed on the edge by that, the glaze slurry adheres to the edge and droops on the surface opposite to the coated surface, it is said by the top edge line Is suppressed.

As described above, even when glaze slurries having different colors or the like are applied to the front and back surfaces of the unglazed dough, it is possible to preferably prevent the glaze slurry from dripping on the other surface, disturbing the boundary line and impairing the quality. Thus, different glazes can be applied to the front and back surfaces. In addition, since the glaze is also included in the glaze slurry for the skyline, the glaze was also generated from the glaze slurry for the skyline when the unglazed dough was main-baked, and the glaze was applied to the front and back surfaces. Since it is integrated with the glaze generated from the glaze slurry, there is no particular problem due to the separate formation of the top edge line.

[0009]

In another preferred embodiment of the present invention, preferably, the method for glazing a ceramic object comprises the step of: (d) after the first coating step and the second coating step, an excess amount of the first first layer adhering on the top edge line. An edge wiping step of wiping the glaze slurry and the second glaze slurry with a water-absorbing wiping member is further included. In this way, even if the applied glaze slurry remains on the top edge line, it is immediately wiped off, so that the glaze slurry attached on the top edge line is on the opposite side to the surface on which the glaze slurry is applied. When flowing on the surface is more reliably suppressed and different glazes are applied on the front and back,
It is possible to more reliably obtain a glaze having a desired color or the like.

Preferably, the glazing method for ceramics comprises: (e) placing the unglazed dough, to which the glaze slurry has been applied in the second coating step, on a conveying member having a water-absorbing property such that the edge is on the lower side. The method further includes a transporting step of transporting while adsorbing the water adhering on the top edge line by placing the wafer on the ceiling line. In this way, even when water is attached to the edge by the wiping member for wiping the glaze slurry remaining on the top edge line in the edge wiping step, drying or baking is performed after the second coating step. When the unbaked dough is transported in order to perform the process, the dough is placed on a water-absorbing transport member such that the edge is on the lower side, so that the water remaining on the edge is sucked by the transport member. Therefore, the generation of dirt due to the water remaining on the edge dripping toward the inner peripheral side of the unglazed dough is suitably suppressed.

Incidentally, when the top line is formed with the above-mentioned top line glaze slurry containing a curing agent, the cured top line is considered to have no water absorption. When the glaze slurry remaining on the top edge line is wiped off with the wiping member impregnated with water in the edge wiping step, the water impregnated in the wiping member adheres to the top edge line.

Preferably, the first coating step and the second coating step include: (f) a rotating step of rotating the unglazed dough around its axis; and (g) the glaze slurry from a glaze discharge nozzle. By moving the glaze discharge nozzle from the outer peripheral side of the unglazed dough toward the axis while discharging the unglazed dough, the glaze slurry is applied to the front or back surface of the unglazed dough being rotated in the rotating step. And a step. With this configuration, the glaze slurry is applied to the unglazed dough from the glaze discharge nozzle that moves along the radial direction of the unglazed dough being rotated. And the like, the glaze slurry can be applied as uniformly as possible. Moreover, since the glaze slurry is applied from the outer periphery of the unglazed dough toward the axis, even when a relatively large hook (yarn bottom) is provided, air can be trapped near the base of the hook. This makes it possible to reliably apply the glaze slurry to a portion having an easy shape.

Preferably, (h) the glaze discharge nozzle has a mesh covering a discharge port for discharging the glaze slurry. With this configuration, when the supply of the glaze slurry to the glaze discharge nozzle is stopped, the glaze slurry forms a film on the mesh due to its viscosity. Dropping can be suitably suppressed.

Preferably, the glazing method for ceramics comprises: (i) a pair of glaze slurry tanks for storing the first glaze slurry and the second glaze slurry, the glaze discharge nozzle, and the glaze step. The glaze slurry is circulated by a diaphragm pump in a circulation path through which the glaze slurry hung on the unglazed dough is collected and sent to the glaze slurry tank and an excess slurry receiving member. In this way, since the glaze slurry is circulated in the circulation path, the generation of sediment inside the glaze slurry tank or the like is suppressed, and the concentration change is less likely to occur. It is possible to apply. Moreover, since the circulation of the glaze slurry is performed by a diaphragm pump having no sliding portion, the glaze slurry cannot enter the sliding portion of the pump to deteriorate the liquid sending performance, the sealing performance, and the like. It is possible to stably circulate the glaze slurry over a period of time.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIGS. 1 to 3 are views showing a glaze machine 10 used in the method of glaze for ceramics according to the present invention, and correspond to a plan view, a front view, and a sectional view taken along the line III-III in FIG. 1, respectively. As shown in FIG. 1, the glaze machine 10 includes unglazed unglazed dough (porcelain green body before main firing) 12a,
A box-shaped container 18 having a pair of rotary tables 14a and 14b inside for mounting and rotating the rotary table 12b around its axis and having two chambers separated by a separation wall 16, and the rotary tables 14a and 14b; 3 and a pair of glazing devices 22 attached to the side of the box-shaped container 18 for applying a predetermined glaze slurry to the front or back surfaces of the unglazed doughs 12a and 12b.
22 and a pair of edge wiping devices 24, 24 attached to the corners of the box-shaped container 18 to wipe off excess glaze slurry adhered to the edges of the unglazed doughs 12a, 12b.

As shown in FIGS. 2 and 3, the rotating device 20 includes rotating shafts 26a and 26b mounted on the rotating tables 14a and 14b, respectively, so as not to rotate relatively.
Pulleys 28a and 28b fitted to the lower portions of the rotating shafts 26a and 26b, and a pair of reduction gears fixed to a frame 30 below the box-shaped container 18 as shown in FIG. A motor 32 and a pair of belts 34 for transmitting the rotations of the output shafts of the pair of motors 32 with reduction gears to the pulleys 28a and 28b, respectively.
a and 14b are rotated at a predetermined rotation speed of, for example, about 300 rpm. 1 to 3 show the unbaked dough 12
4 shows a backing glazing machine 10b for hanging a glaze slurry on the back surface, and the front hanging glazing machine 10a has a substantially similar structure, but as shown in FIG. The shapes are different.

As shown in FIG. 1, each of the pair of glaze devices 22, 22 includes a glaze discharge section 40 having a glaze discharge nozzle 38 for discharging a glaze slurry, and a glaze discharge section 40 which is mounted on a turntable. And a nozzle moving device 42 for approaching 14a or 14b. As shown in FIGS. 1 and 3, the nozzle moving device 42 includes a glaze air cylinder 46 having a cylinder rod 44, a guide bush 48 fixed above the glaze air cylinder 46, and The guide bush 48 is constituted by a guide rod 50 fitted so as to be relatively movable in the axial direction. The cylinder rod 44 and one end of the guide rod 50 are used to fix the glaze discharge section 40 to one end. Are attached. The other end of the guide rod 50 is screwed with an adjusting screw 54 whose screwing amount is changed in order to adjust the amount of protrusion of the glaze discharging portion 40 within a range of, for example, about 300 mm at the maximum.

As shown in detail in FIG. 5, only one of the glaze discharge portions 40 has a female screw hole 56 provided in the center of the fixing member 52 and a long hole 60 provided in the base portion 58. Upper and lower positioning members 62 to be stopped
A plate-shaped nozzle mounting portion 64 formed in a direction perpendicular to the base 58 and away from the nozzle moving device 42 from one end of the base 58 extending in the vertical direction, and a lower end of the nozzle mounting portion 64 A glaze discharge nozzle 38 attached to the portion by a nozzle fixing member 66, a glaze slurry supply hose 70 attached to the upper end of the nozzle attaching portion 64 by a hose attaching member 68,
A pinch that is provided between the nozzle fixing member 66 and the hose mounting member 70 and that stops the discharge of the glaze slurry by pressing the tube 72, the tube 72 connecting the glaze discharge nozzle 38 and the glaze slurry supply hose 70. A valve device 74.

The vertical positioning member 62 is provided with a long hole 60.
A guide member 78 having a side surface 76 extending in the vertical direction on one side and fixed to one surface of the base portion 58 on the fixing member 52 side is provided, and the side surface 76 of the guide member 78 is provided on one side surface 80 of the fixing member 52. In the abutted state, it is fixed to the fixing member 52 at an arbitrary vertical position within the range of the elongated hole 60. Thus, the vertical position of the glaze discharge nozzle 38 can be changed as appropriate.

The pinch valve device 74 includes a tube receiving member 82 fixed to the nozzle mounting portion 64 of the vertical positioning member 62 and having a semi-cylindrical receiving surface for receiving the tube 72, and the tube receiving member 82. One end is fixed to the side surface on the side of the base 58 side, and a cylinder fixing member 84 provided in parallel with the base 58 is fixed to the cylinder fixing member 84, and a pressing member 86 is attached to one end of the cylinder rod 85. And a pinch valve air cylinder 88 for moving the pressing member 86 in a direction approaching the tube 72. The above tube 7
2 is made of, for example, flexible neoprene rubber, and when pressed by the pressing member 86, the inner flow path is shut off, so that the glaze slurry supplied from the glaze slurry supply hose 70 is used for the glaze. It is prevented from being sent to the discharge nozzle 38. Further, the pressing member 86
Has a cylindrical surface whose axis is parallel to the tube 72, and prevents the surface of the tube 72 from being damaged when pressed.

A discharge port 90 at the tip of the glaze discharge nozzle 38 is provided with a mesh (wire mesh) 92 of, for example, about # 80.
Is discharged through.

Returning to FIG. 1, the pair of edge wiping devices 2
Reference numerals 2 and 22 denote a disk-shaped edge wiping sponge 96 fitted non-rotatably with a rotation shaft 94 having a horizontal axis, and a rotation of the output shaft to the rotation shaft 94 by a belt 98. Is transmitted to the edge-wiping sponge 9.
6 and a supporting member 1 to which the edge wiping sponge 96 and the rotating shaft 94 are attached.
02 and an air cylinder 106 for edge wiping having a cylinder rod 104 fixed to the support member 102 thereof. The cylinder rod 104 is protruded from the air cylinder 106 for edge wiping to form the sponge 9 for edge wiping.
6 is approached to the unglazed dough 12a or 12b on the turntable 14a or 14b. The support member 10
2 has a guide rod 110 fixed at one end thereof to a guide bush 108 fixed adjacent to the edge wiping air cylinder 106 so as to be relatively movable in the axial direction. In the present embodiment, the edge wiping sponge 96 corresponds to a wiping member.

Both the edge wiping air cylinder 106 and the guide bush 108 are provided on a moving table 112, and are moved toward or away from the rotating table 14 by rotating a rotating handle 114. That is, the protrusion amount of the edge wiping air cylinder 106 is, for example, about 100 mm, and the entire edge wiping device 24 is moved in accordance with the outer diameter of the unglazed dough 12 placed on the turntable 14. In the figure, 116
Is a water reservoir for storing water for removing glaze slurry adhered to the edge wiping sponge 96.

The bottom of the box-shaped container 18 is inclined as shown in FIG. 3, and the lowermost end of each of the two chambers separated by the separation wall 16 has an unglazed portion. An outlet 1 for discharging excess glaze slurry from the box-shaped container 18 when the glaze slurry is hung on the dough 12.
18, 118 are provided, respectively. 1 omits the pinch valve device 74 and the like, and FIG. 2 omits the edge wiping device 24 and the like.

FIG. 6 is a diagram showing the configuration of an apparatus for sending glaze slurry to the glaze machine 10. The glaze slurry tank 120 stores a predetermined glaze slurry to be applied to the unglazed dough 12, and is connected to a diaphragm pump 126 by a main pipe 124 having a valve 122. The diaphragm pump 126 is connected to the chamber 1
28, is connected to the glaze discharge nozzle 38 by a supply pipe 132 having a valve 130, and the glaze slurry in the glaze slurry tank 120 is supplied to the glaze discharge nozzle 38 by a pneumatically operated diaphragm pump 126 and discharged. . The chamber 128
Functions as a pressure accumulator for stabilizing the pressure of the glaze slurry in the supply pipe 132 and discharging the glaze slurry from the glaze discharge nozzle 38 quantitatively.

The outlet 118 of the box-shaped container 18
Is connected to the glaze slurry tank 120 via the return pipe 134.
It is connected to the. That is, in this embodiment, the box-shaped container 18 corresponds to the surplus slurry receiving member,
24, a supply pipe 132 and a return pipe 134 form a circulation path for circulating the glaze slurry. In addition,
The supply pipe 132 is branched into two branches at the tip of the chamber 128, one of which is connected to the glaze discharge nozzle 38 on the turntable 14 a side, and the other is connected to the glaze discharge nozzle 38 on the turntable 14 b side. Glaze slurry tank 1
A filter 136 made of a wire mesh or the like is provided at an upper portion of the filter 20, and the glaze slurry returned from the return pipe 134 is supplied into the filter 136. In the drawing, reference numerals 138, 140, and 142 denote discharge valves for discharging the glaze slurry remaining in the original piping 124 and the like, for example, when the glaze slurry is switched.

FIG. 7 is a diagram showing a glaze line provided with the glaze machine 10. In this glaze line, a glaze machine 10 for applying a first glaze slurry to the surface of the unglazed dough 12 along the flow direction of a belt conveyor 144 that conveys the unglazed dough 12 in the direction of the arrow in the figure.
a, a backing glazing machine 10b for applying a second glaze slurry to the back surface, a reversing device 146 for turning over the unglazed dough 12 placed on the belt conveyor 144 with the back surface facing up after the back surface is glazed. And unglazed dough 12
A hammer wiping device 148 for removing the second glaze slurry adhering to the hammer is provided, a worker a placing the unglazed dough 12 on the belt conveyor 144, and an operation of operating the front glaze machine 10a. Person b, backing glazing machine 1
There are four workers c, a worker c operating Ob, and a worker d, who picks up the unglazed dough 12 coated with the glaze slurry from the belt conveyor 144.

The belt conveyor 144 is divided at several points in the flow direction. At least in the middle of the drawing where the unglazed dough 12 is placed with the back surface facing upward, a sponge or the like is used. A material having water absorbency is provided on the surface of the conveyor belt 150. Further, the above-mentioned wiping device 148 is composed of two parallel conveyor belts 152a and 152b each having a sponge or the like on the surface and having different conveying speeds, and the conveyor belts 152a and 152b are different in their conveying speeds. , 152b, the second glaze slurry adhering to the unglazed dough 12 is peeled off.

The operation of applying different glazes to the unglazed dough 12 on the front side and the back side using the glaze line configured as described above will be described with reference to the process chart of FIG. First, step 1
In the above, the dough 12 having a predetermined shape is produced by, for example, potter's wheel molding. After drying the dough 12 for a predetermined time, in step 2, unglazed dough is formed at a predetermined temperature of, for example, about 900 ° C. to form unglazed dough. Then, in step 3, a predetermined glaze slurry for a ceiling wire separately prepared is applied to the edge of the unglazed dough 12 with, for example, a brush or a brush, and in the subsequent step 4, it is left at room temperature for about one day, for example. After drying and curing the top line glaze slurry to form a top line having a thickness of, for example, about 0.1 mm, the unglazed dough 12 is passed through the glaze line shown in FIG. In the present embodiment, the steps 3 and 4 correspond to the top edge line forming step.

The top edge line is formed, for example, from a position about 1 mm inside the curved surface start portion of the edge to the outer peripheral side. In addition, the glaze slurry for a ceiling wire is, for example, a glaze slurry to which a curing agent that cures at room temperature is added, for example, to a commonly used glaze slurry. Thereby, the top edge line does not have water absorption. Of the following formulation compositions, the color former is added in an appropriate amount when the top line is used as a color glaze. The amount of water mixed with the glaze is determined, for example, so that the viscosity of the glaze slurry is about 250 cps.

In the glazing line, first, in step 5, the worker a performs so-called dusting for removing dust and the like on the surface of the unglazed dough 12, and then puts it on the belt conveyor 144 in step 6, so that it is covered. Glaze machine 10
conveyed toward a. In step 7, the operator b places the unglazed dough 12 on the belt conveyor 144 on one of the rotating bases 36 of the front glaze machine 10a and operates a start switch (not shown), whereby the unglazed dough 1 is formed.
A predetermined first glaze slurry separately prepared is applied to the surface of the second. In the present embodiment, this step 7 corresponds to the first coating step. The first glaze slurry has a composition similar to that of the above-described top line glaze slurry to which no water-soluble hardener is added, and the color former is appropriately changed according to a desired color.

In the above step 7, the first glaze slurry is applied in accordance with, for example, a timing chart shown in FIG. 9A by the operation of a control device (not shown) provided in the control panel 154 shown in FIG. You. That is,
When the unglazed dough 12 is placed on the turntable 36 and a start switch (not shown) is operated at time t ₀ , the cylinder rod 44 starts to protrude from the glaze air cylinder 46, and further, at time t ₁ , the pinch valve air cylinder When the cylinder rod 85 of FIG.
As shown in FIG. 0, the glaze discharge nozzle 38 is moved in the order of A → B → C toward the axis of the turntable 36 while discharging the first glaze slurry from the discharge port 90. Thereby, the first glaze slurry is applied to the surface of the unglazed dough 12 placed on the turntable 36.

The motor 32 with a speed reducer for rotating the turntable 36 and the rotary motor 100 for rotating the edge wiping sponge 96 are constantly rotated. Therefore, in the present embodiment, the rotation step is always performed. In the present embodiment, while the cylinder rod 85 of the pinch valve air cylinder 88 is retracted, that is, the times t _{1 to} t ₃ correspond to the glaze process. FIG. 10 is a view for explaining a state in which the second glaze slurry is applied to the back surface of the unglazed dough 12 in the process 10 described below.
The same applies to the case where the first glaze slurry is applied to the surface.

Then, at time t ₂ , when the amount of protrusion of the cylinder rod 44 of the glaze air cylinder 46 becomes maximum, the cylinder rod 44 is retracted while the first glaze slurry is being discharged from the glaze discharge nozzle, and the time t 2
_When it becomes ₃ , the cylinder rod 85 is protruded and the supply of the glaze slurry is stopped. At this time, since the discharge port 90 of the glaze discharge nozzle 38 is provided with a mesh 92, the glaze slurry remaining in the glaze discharge nozzle 38 forms a film on the mesh 92, and discharge of the glaze slurry is performed. Stopped immediately. The time t ₁ at which the discharge of the first glaze slurry is started is, for example, about 0.8 seconds after the time t _0.
There time t ₂ to start retraction of the cylinder rod 44 is a protruding start time t ₀ and after approximately 1.5 seconds, the first glaze slurry ejection time (t ₃ -t ₁₎ is for example 1.0
It is about a second. In the present embodiment, the times t ₀ to t _{2 at} which the cylinder rods 44 protrude from the glaze air cylinder 46 correspond to the nozzle moving step.

After a predetermined time has passed since the first glaze slurry was applied to the unglazed dough 12 as described above, at time t ₄
Then, in step 8 corresponding to the rim wiping step, the cylinder rod 104 is protruded from the rim wiping air cylinder 106 to rotate the rim wiping sponge 96 as shown by a two-dot chain line in FIG. The first glaze slurry is pressed against the edge of the unglazed dough 12 and adheres to the top edge line 156 formed at the edge. Then, at time t _5, the cylinder rod 10
4 is pulled in, and the edge wiping is completed. The predetermined time during which the edge wiping is started is, for example, performed by, for example, using the glaze air cylinder 4.
6 after the retraction of the cylinder rod 44 has started
The time (t ₅ -t ₄ ) until the edge wiping is completed is, for example, about 2.0 seconds. The predetermined time until the edge wiping is started is a time required for the first glaze slurry applied to the surface to sufficiently dry.

After the application of the first glaze slurry and the edge wiping are completed as described above, in the subsequent step 9, the unbaked dough 12 is removed from the turntable 36 by the operator b and returned to the belt conveyor 144. Then, it is conveyed toward the backing glazing machine 10b. In steps 10 and 11 corresponding to the second application step and the edge wiping step, respectively, a predetermined second glaze slurry separately prepared is applied to the back surface of the unglazed cloth 12 in the same manner as in the steps 7 and 8. The second glaze slurry differs from the first glaze slurry, for example, only in the color former. In the above steps 10 and 11, for example, the second glaze slurry is applied according to the timing chart shown in FIG.
In addition, the edges are wiped. As for steps 10 and 11, only the parts different from steps 7 and 8 will be described.

Until the time t ₀ , the motor 3
2 is stopped, and during this stop time, the unglazed dough 1 placed on the turntable 14 by the worker c.
Two centerings are made. That is, in the above-mentioned step 7, since the first glaze slurry is applied to the surface,
For example, since the centering can be easily performed by fitting the unglazed dough 12 into a groove (not shown) provided on the turntable 36, no special time for centering is required. In the step 10 of applying the glaze slurry, since there is no reference on the position of the unglazed dough 12 on the turntable 14, the centering needs to be performed in a stopped state. Then, when the motor 32 with the speed reducer is rotated by operating a rotation start switch (not shown) at time t ₀ , the turntable ₁ is rotated at time t ₁ .
4 is stabilized, the cylinder rod 44 is protruded from the glaze air cylinder 46, and the unglazed dough 1
2 is coated with a second glaze slurry. The timing of each operation after the cylinder rod 44 starts to protrude at this time t ₁ is the same as in steps 7 and 8 shown in FIG. 9A.

However, in steps 10 and 11, the time t
In _6, after retraction of the cylinder rod 104 of the edge wiping air cylinder 106 has passed a predetermined time period from the start, at time t _7, the the next biscuit dough 12 2
The motor 32 with the speed reducer is stopped in preparation for the application of the glaze slurry. The predetermined time period (t ₇ -t ₆₎
Is set to a time sufficient for drying the moisture attached to the edge of the unglazed dough 12 in the edge wiping step, for example, about 5.0 seconds.

After the second glaze slurry is applied to the back surface of the unglazed dough 12 as described above,
The worker c has the same orientation as when the second glaze slurry is applied to the back surface shown in FIG. 10, that is, with the edge (that is, the top edge line 156) on the lower side and the hook 158 on the upper side,
The unbaked dough 12 is sent to the reversing device 146 by returning it to the belt conveyor 144. At this time, since the surface of the conveyor belt 150 is provided with a water-absorbing material such as a sponge as described above, water adhering to the top edge line 156 is absorbed by the conveyor belt 150. That is, in the present embodiment, this step 1
2 corresponds to a transport step. FIG. 10 shows a state after the second glaze slurry is applied to the entire back surface, and any glaze slurry applied to the front surface and the back surface is applied to a range up to the top edge line 156, The entire surface of the unglazed dough 12 is covered by the first glaze slurry, the second glaze slurry, and the top edge line 156. FIG.
As is apparent from the above, the glaze discharge nozzle 38 is located at a position further advanced than the rotation axis of the turntable 14 when the cylinder rod 44 is in the maximum protruding state.

In the following step 14, the reversing device 146
The unbaked dough 12 whose edge (top edge line 156) is turned upward by the above is sent to the add-on wiping device 148 having a pair of conveyor belts 152a and 152b having different conveying speeds, so that the dough 158 is applied to the add-on 158. 2 The glaze slurry is peeled off. That is, the conveyor belt 15
Since the speeds of 2a and 152b are different, the unbaked dough 1
2 is rotated about the vertical axis of rotation, so that the hammers 158 are rubbed by the conveyor belts 152a and 152b to peel off the second glaze slurry. Thereafter, the unbaked dough 12 is picked up by the worker d from the belt conveyor 144, put into a predetermined baking furnace in step 15, and subjected to main baking at a predetermined baking temperature of, for example, about 1200 ° C. Is sintered, and at the same time, the first glaze slurry, the second glaze slurry, and the top line glaze slurry are vitrified to obtain ceramics with different glazes on the front and back surfaces.

Here, in this embodiment, when glaze is applied to the porcelain, the glaze slurry for the top line containing a glaze and a hardening agent at the edge of the unglazed dough 12 in the top line forming step of step 3 and step 4 Is applied and cured to form a top edge line 156, and a first glaze slurry is applied to the surface of the unglazed dough 12 on which the top edge line 156 has been formed in the first application step of step 7, and In the second application step 10, the second glaze slurry is applied to the back surface of the unglazed dough 12 to which the first glaze slurry has been applied. Therefore, since the glaze slurry for the top line is applied to the edge of the unglazed dough 12 separately from the front and back surfaces, the first glaze slurry and the second glaze slurry for applying colors to the front and back surfaces are applied to the edge. Step 7 is no longer necessary.
When the glaze slurry is applied in the step 10, the glaze slurry for the top line is hardened and the top line 156 having no water absorption is formed at the edge, so that the glaze slurry is applied. The top edge line 156 suppresses attachment to the edge and dripping on the surface opposite to the surface on which the coating is applied.

As described above, even when glaze slurries having different colors or the like are applied to the front and back surfaces of the unglazed dough 12, it is possible to prevent the glaze slurry from dripping on the other surface, disturbing the boundary line and impairing the quality. Then, it becomes possible to apply different glazes on the front surface and the back surface. In addition, since the glaze is also contained in the glaze slurry for the skyline, the process 15
When the unbaked dough 12 is fully baked, the glaze is also generated from the glaze slurry for the top line, and is integrated with the glaze generated from the glaze slurry applied to the front and back surfaces. The formation of the 156 separately does not cause any trouble.

Further, according to the present embodiment, the glaze machine 10 is provided with the edge wiping device 24 having the edge wiping sponge 96 which has a water absorbing property and wipes off the excess glaze slurry adhered on the top edge line 156. Then, in the edge wiping step of Steps 8 and 11, even if the applied glaze slurry remains on the top edge line 156 with the edge wiping sponge 96, the glaze slurry is immediately wiped off. The flow of the glaze slurry adhered on the line 156 to the surface opposite to the surface on which the glaze slurry is applied is more reliably suppressed. A glaze having a pattern or the like can be obtained.

Further, according to the present embodiment, in the transporting step of step 12, the unglazed dough 12 coated with the glaze slurry is placed on the conveyor belt 150 provided with a water-absorbing sponge or the like on the surface. Since the edge line 156 is placed on the lower side, when the glaze slurry adhered on the top edge line 156 is wiped off in the edge wiping step of step 11, the edge wiping sponge 96 is used to remove the top edge. Line 1
Even if water is deposited on the top line 56,
The water remaining on 6 is absorbed by the conveyor belt 150. Therefore, generation of dirt due to the water remaining on the top edge line 156 dripping toward the inner peripheral side of the unglazed dough 12 is suitably suppressed.

Further, according to the present embodiment, the first coating step and the second coating step of Steps 7 and 10 include a rotation step of rotating the unglazed dough 12 around its axis, A step of moving the glaze discharge nozzle 38 from the outer peripheral side of the unglazed dough 12 toward the axis while discharging the slurry to apply the glaze slurry to the front or back surface of the unglazed dough 12 being rotated; To include, as shown in FIG.
The glaze slurry is applied to the unglazed dough 12 from the glaze discharge nozzle 38 that moves in the radial direction of the unglazed dough 12 being rotated, and the unglazed dough 1
Regardless of the shape of 2, the glaze slurry can be applied as uniformly as possible, for example, in the case of a shape with an edge such as a bowl 12 'indicated by a broken line in FIG. Moreover, since the glaze slurry is applied from the outer periphery of the unglazed dough toward the axis, even when a relatively large hook 158 'is provided as shown by the broken line in FIG. The glaze slurry can be surely applied to a portion having a shape in which air can easily accumulate, such as near the base of 158 '.

Further, according to the present embodiment, since the mesh 92 is provided at the discharge port 90 of the glaze discharge nozzle 38, the supply of the glaze slurry to the glaze discharge nozzle 38 by the operation of the pinch valve device 74 or the like. When stopped, the viscosity of the glaze slurry is reduced by a mesh 92
A film. Therefore, dropping of the glaze slurry during the supply stop can be suitably suppressed.

According to the present embodiment, the glaze slurry is supplied to the glaze slurry tank 120 and the glaze discharge nozzle 38.
And a box-shaped container 18 functioning as a surplus slurry receiving member
Is circulated by the diaphragm pump 126 in the circulation path passing through, so that the generation of sediment inside the glaze slurry tank 120 and the like is suppressed, and the concentration change is less likely to occur, so that the glaze slurry can be applied more uniformly. Is possible. Further, since the circulation of the glaze slurry is performed by the diaphragm pump 126 having no sliding portion, the glaze slurry does not enter the sliding portion of the pump, so that the liquid sending performance and the sealing performance cannot be deteriorated. It is possible to stably circulate the glaze slurry over a period.

While the embodiment of the present invention has been described in detail with reference to the drawings, the present invention can be embodied in still another embodiment.

For example, in the above-described embodiment, the steps 8 and 11 corresponding to the edge wiping step are provided. However, these steps need not always be provided. That is, as described above, the top edge line 156 has no water absorption, and the unglazed dough 12 is rotated around its axis, so that the glaze hung on the top edge line 156 Since the slurry is blown off by centrifugal force and hardly remains on the top edge line 156,
It is not always necessary to carry out the edge wiping step. However, in order to more reliably suppress the glaze slurry from remaining on the top edge line 156, an edge wiping step is preferably provided.

In the embodiment, in the transporting step of step 12, the unbaked dough 12 is placed on a conveyor belt 150 provided with a water-absorbing material on its surface such that the top edge line 156 is on the lower side. By placing it, the top line 1
Although the water adhering to 56 was absorbed, this transporting step is not always necessary. For example, if the water adhering to the top line 156 on the turntable 14 or the belt conveyor 144 after the second coating step of the step 10 is wiped off, the above-described transport step is unnecessary, or If the edge wiping process of No. 11 is not performed, water cannot adhere to the top edge line 156, so that the transport process is unnecessary.

In the embodiment, the first and second
The application step includes the rotating step, the glaze step, and the moving step, but these may not necessarily be included. For example, instead of rotating the unglazed dough 12, the glaze discharge nozzle 38 is spirally moved on the unglazed dough 12,
Alternatively, the glaze slurry may be discharged from a glaze discharge nozzle having a discharge port sufficiently larger than the diameter of the unglazed dough 12.

When the tube 72 is pressed by the pinch valve device 74 and the flow path of the glaze slurry is closed, the discharge of the glaze slurry from the discharge port 90 is difficult. Covering mesh 9
2 need not necessarily be provided.

A circulation path passing through the glaze slurry tank 120, the glaze discharge nozzle 38, and the box-shaped container 18 may not necessarily be provided. For example, surplus glaze slurry generated in the box-shaped container 18 is separately collected. And may be discarded or reused. However, once the glaze slurry is precipitated or solidified, it is difficult to uniformly disperse it. Therefore, it is preferable to circulate the glaze slurry, and when not circulating, it is preferable to constantly stir the glaze slurry in the glaze slurry tank 120.

Also, in the embodiment, the glaze machine 10
Although two turntables 14a and 14b were provided, the turntable 1
The number 4 is appropriately changed. For example, one glaze machine 10 may be provided, or three or more glaze machines may be provided.

Although not specifically exemplified, the present invention
Changes can be made as appropriate without departing from the spirit of the invention.

[Brief description of the drawings]

FIG. 1 is a plan view showing a glaze machine used in a glaze method according to one embodiment of the present invention.

FIG. 2 is a front view of the glaze machine of FIG.

FIG. 3 is a sectional view taken along line III-III in FIG.

FIG. 4 is a view corresponding to a part of FIG. 3 in the glaze machine for hanging a table.

FIG. 5 is a perspective view showing a glaze discharging section of the glaze machine of FIG. 1;

6 is a diagram showing an example of a connection configuration of the glaze machine of FIG.

FIG. 7 is a diagram illustrating an example of a glaze line using the glaze machine of FIG. 1;

FIG. 8 is a process chart showing an example of a method for glazing ceramics using the glazing line of FIG. 7;

FIG. 9 is a timing chart showing the operation of the glaze machine of FIG.

FIG. 10 is an explanatory diagram showing movements of a glaze discharge nozzle and a rim wiping sponge.

[Explanation of symbols]

 12: Unglazed dough 156: Skyline

Claims (6)

(57) [Claims] 1. A glaze method for applying different glazes to a front surface and a back surface of ceramics, comprising a glaze and a hardening agent at an edge which is a boundary between the front surface and the back surface of unglazed unglazed dough. A top line forming step of forming a top line by applying and curing the line glaze slurry; and applying a predetermined first glaze slurry to one of the front and back surfaces of the unglazed dough on which the top line is formed. A first application step of applying, and a second application step of applying a predetermined second glaze slurry to the other of the front surface and the back surface of the unglazed dough to which the first glaze slurry has been applied, Glazing method. 2. After the first coating step and the second coating step, excess first glaze slurry and second glaze slurry adhered on the top edge line are respectively wiped with a water-absorbing wiping member. 2. The method for glazing ceramics according to claim 1, further comprising an edge wiping step. 3. The unglazed dough, to which the second glaze slurry has been applied in the second applying step, is placed on a water-absorbing conveying member such that the edge thereof is on the lower side, so that the top surface of the dough is facing down. 3. The method according to claim 2, further comprising a transporting step of transporting while absorbing moisture adhering on the edge line.
Glazing method of ceramics. 4. The first coating step and the second coating step include: a rotating step of rotating the unglazed dough around its axis; and discharging the first glaze slurry or the second glaze slurry from a glaze discharge nozzle. By moving the glaze discharge nozzle from the outer peripheral side of the unglazed dough toward the axis while causing the unglazed dough to rotate, the first glaze slurry or the second 2. The method of claim 1, further comprising the step of applying a glaze slurry. 5. The method of claim 4, wherein the glaze discharge nozzle has a mesh covering a discharge port for discharging the first glaze slurry or the second glaze slurry. 6. A pair of glaze slurry tanks for storing the first glaze slurry and the second glaze slurry, respectively.
In a circulation path passing through the glaze discharge nozzle and an excess slurry receiving member that collects the first glaze slurry and the second glaze slurry hung on the unglazed dough in the glaze applying step and sends the slurry to the glaze slurry tank, The method for glazing ceramics according to claim 4, wherein said first glaze slurry or said second glaze slurry is circulated by a diaphragm pump.