JP2004224614A - Pottery having base - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide pottery whose production cost is low, concerning the pottery such as a tea set having a base. <P>SOLUTION: The pottery 10 having the base is manufactured by a forming process S1 for forming a pottery clay product 35 provided with a main body 36 and the base 38 from pottery clay, a glazing process S3 for glazing the whole surface of the pottery clay product, a shaving process S4 for shaving the outer peripheral surface 39 of the base to remove the glaze of the base and making a corner on the outer peripheral surface 39 of the base and a firing process S5 for firing the pottery clay product in a kiln. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a pottery having a hill such as a tea set.
[0002]
[Prior art]
Pottery is completed by applying a glaze to a pottery clay product (base material) obtained by molding the pottery clay into a predetermined shape, and then baking it. Various bowls and dishes such as tea utensils and sake wares are manufactured. Among them, a tea set 60 shown in FIG. 5 (see Patent Document 1) includes a main body 62 and a hill 64 on the bottom side thereof. The main body 62 is a portion for storing beverages (tea, sake), and the hill 64 is a portion serving as a base when the tea ceremony 60 is placed on a table or the like. Normally, a glaze is not applied to the hill 64 of the tea set 60.
[0003]
[Patent Document 1]
JP 2000-139664 A
[Problems to be solved by the invention]
In the conventional tea set 60, in order to prevent the hill 64 from being glazed, a water repellent is applied to the hill 64 before glazing the clay product. As a result, when the tea ware 60 is manufactured, the steps of molding a pottery product, applying a water repellent to the hill 64, glazing the pottery product, and firing the pottery product are performed. The number of steps has increased the production costs of the porcelain.
[0005]
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a porcelain that is less expensive to manufacture than conventional ones.
[0006]
[Means for Solving the Problems]
The inventor of the present application reviewed the manufacturing process in order to reduce the manufacturing cost of pottery having a hill. At that time, the hint was that the outer surface of the hill was more angular than the round surface, which was more upscale and was often preferred by consumers.
[0007]
A porcelain product having a hill according to the present invention is, as described in claim 1, a molding process of molding a porcelain clay product having a main body and a hill from porcelain clay; a glaze process of applying glaze to the entire surface of the porcelain clay product; And shaving the outer peripheral surface of the hill, removing the glaze on the outer peripheral surface, and squaring the outer peripheral surface; and firing the ceramic clay product in a kettle. When manufacturing the porcelain, if the outer peripheral surface of the hill is cut by a cutter in a cutting process, the glaze on the outer peripheral surface is removed, and the tip and the root of the outer peripheral surface are squared.
[0008]
According to a second aspect of the present invention, in the shaving step of the first aspect, the rotating member is covered with a pottery clay product, and the other rotating member presses a depression on a hill, and the cutter is made to approach the center of the hill to cut. The porcelain according to claim 3 further includes a wiping step of wiping glaze on the back surface of the hill between the glaze step and the shaving step. According to a fourth aspect of the present invention, in the first aspect, the porcelain is a tea set including a bowl and a cup.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
<Pottery>
"Yakimono" is completed by molding potter's clay, applying glaze, and baking in a kiln. The present invention is directed to pottery having a cylindrical hill and a circular cross section of a main body, and a tea set and a sake set are typical examples. Tea utensils include teacups and teacups, and sake utensils include sake bottles.
[0010]
FIG. 4 shows various bowls. 4A has a main body 52 and a hill 53, and the bowl-shaped bowl 54 of FIG. 4B has a main body 55 and a hill 56. FIG. The illustrated flat bowl 57 has a main body 58 and a hill 59. In addition, various pots and various dishes are included in pottery.
<Manufacturing process>
(1) "Pottery" is a raw material for pottery, and general-purpose pottery such as red clay, semi-porcelain or white clay can be used.
{Circle around (2)} In the forming (pottery) process, a pottery clay product having a predetermined shape is formed from pottery clay. The present invention is directed to the production of pottery as mass-produced products, not handmade pottery. A molding device is used for mass production. At the time of molding, care is taken so that the wall thickness of the main body and the hill of the ceramic clay product is uniform over the entire circumferential direction. In addition, the form, weight, and feel are taken into consideration according to the type and use of pottery such as tea utensils and sake wares.
[0011]
Thereafter, the clay product is dried and unglazed as required. Drying is performed slowly without exposing the clay product to sunlight or wind. Unglazing is performed to prevent the glaze from peeling off during the main baking, and the ceramic product is baked at 750 to 850 ° C.
(3) In the glaze (decoration) process, a glass-like glaze is applied to the surface of the porcelain. Various colors are obtained by glazing the clay product with a glaze, eliminating water leakage and making it harder for dirt to adhere. Glazes are classified into ash glaze, feldspar glaze or lime glaze depending on the raw materials used, and are classified into matte glaze, transparent glaze or crystal glaze according to the sense of appearance.
[0012]
When applying the glaze, the porcelain product is immersed in a bath for storing the glaze, and the entire surface of the porcelain product, that is, the inner and outer surfaces of the main body, and the inner, outer, and bottom surfaces of the hill are glazed.
{Circle around (4)} In the shaving step, the pottery product is rotated using a pair of rotating members arranged coaxially in the vertical or horizontal direction.
[0013]
A cutter (blade) is approached radially inward to the rotating terrain of the clay product, and the outer peripheral surface is cut by a predetermined thickness. The cutter may have a height approximately equal to or slightly higher than the height of the hill. The shape of the cutting edge of the cutter may be parallel to the axis of the one rotating member and the other rotating member, or may be tapered or divergently inclined with respect to the axis. When the outer peripheral surface of the hill is cut with a cutter, the root and the tip of the outer peripheral surface are squared, and the glaze on the outer peripheral surface is removed.
(5) The firing (main firing) process is performed in a kiln. Kilns include electric kilns and gas kilns. Electric kilns include those for oxidation firing and those for reduction firing. Gas kilns can be freely oxidized and reduced. Firing is roughly divided into baking, which removes the water content of the clay product and promotes the chemical change of the glaze, attacking, which sinters the clay product and develops the color of the glaze, and kneading, which matures the clay product.
[0014]
【Example】
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
(Bowl)
As shown in FIG. 1, the bowl 10 includes a trunk 12, a waist 16, and a hill 25. The torso 12 is a bulge in the center and forms the main part of the bowl. The upper edge of the body 12 is the edge 13. The hill 25 is a base portion provided on the bottom surface of the bowl 10. The annular back surface is a hill with a hill 23, and the hollow inside is an inside of a hill (back of the hill) 24. The curved portion between the trunk 12 and the hill 25 is the waist 16. The body 12 is composed of the trunk 12 and the waist 16. Between the waist 16 and the hill 25, a hill side 17 near the waist 16 and a hill 18 near the hill 25 are formed.
[0015]
The outer peripheral surface 26 of the hill 25 is formed of a cylindrical surface having a constant radius from the center line x of the bowl 10, and the outer diameter is constant over the entire length. As a result, the root 27 of the outer peripheral surface 26 is substantially at right angles to the hill 18 of the waist 16, and the tip 28 is substantially at right angles to the tatami mat 23.
[0016]
The entire inner surface of the teacup 10 is assumed to be 30, and the hollow bottom is used as the tea basin 31.
(Manufacture of bowls)
The bowl was manufactured by the following steps. As shown in FIG. 2, the manufacturing process includes a forming process S1, a drying / unglazing process S2, a glaze process S3, a shaving process S4, and a firing process S5.
{Circle around (1)} In the molding step S1, a pottery clay product 35 (also referred to as a base material; see FIG. 3) is formed using a molding apparatus. Specifically, the solid cylindrical pottery is cut in the diameter direction to make a disc-shaped pottery. This disc-shaped porcelain clay is placed in a bottomed cylindrical container, and the center of the surface is protruded with a round bar to form a round depression. Thereafter, when the round bar is moved outward in the radial direction, a pottery clay product 35 having a main body 36 and a hill 38 is formed.
{Circle around (2)} Drying and unglazing step S2, the clay product 35 is dried and unglazed.
{Circle around (3)} Next, in the glaze step S3, a part of the main body 36 of the pottery clay product 35 is grasped by a gripping member, and is immersed in a bath in which glaze is stored. Thereby, the inner and outer surfaces of the main body 36 and the inner and outer peripheral surfaces and the bottom surface of the hill 38 are glazed. Thereafter, the clay product 35 is placed on a cloth member and rotated on the cloth member to wipe off the glaze with the tatami mat.
{Circle around (4)} In the shaving step S4, as shown in FIG. 3, the outer peripheral surface 39 is shaved in order to remove the glaze on the hill 38 and to square it. At this time, the pottery clay product 35 is turned upside down, and the main body 36 is put on the lower rotating member 46 having a shape corresponding to the inner surface of the main body 36. The lower rotating member 46 has an intake hole on its surface, and sucks the porcelain product 35 to prevent slippage. Further, the upper rotating member 48 having a shape corresponding to the inside of the hill is lowered and fitted to the hill 38. Thereafter, the lower rotating member 46 and the upper rotating member 48 are rotated to rotate the clay product 35 about its center line x. .
[0017]
The cutter (blade) 43 is advanced radially inward toward the hill 38 of the rotating clay product 35. The cutter 43 has a height substantially equal to the height of the hill 38, and the shape of the cutting edge 44 is parallel to the center line x of the porcelain product 35.
[0018]
The outer peripheral surface 39 of the hill 38 is cut to a predetermined depth by the cutter 43, and is finished into a cylindrical surface having a constant radius from the center line corresponding to the shape of the cutting edge 44. At this time, the root portion 41 of the outer peripheral surface 39 is angled with respect to the edge of the hill, and the tip end portion 42 is angled with the tatami mat. At the same time, the glaze on the outer peripheral surface 39 of the hill 38 is removed. Is done.
{Circle around (5)} Finally, in the firing step S5, the firing step is performed in an electric furnace for reduction. Before the temperature reaches 400 ° C., the water content of the clay product 35 is drained. The crystal water of the glaze decomposes between 400 and 700 ° C. The clay product 35 is sintered at a temperature of 1000 to 1200 ° C. by penetrating into a portion where the melted and vitrified portion does not melt. In addition, crystalline minerals are formed, which strengthen the porcelain products.
[0019]
The glaze is vitrified at 1000 to 1200 ° C., and the metal contained therein is colored by a chemical reaction. Then, the bowl is cooled for about the same time as baking and is discharged from the kiln, whereby a tea bowl 10 (see FIG. 1) as a final product is obtained.
(effect)
According to this embodiment, the following effects can be obtained.
[0020]
First, it is possible to manufacture a high-quality teacup 10 in which a glaze is not applied to the outer peripheral surface 26 of the hill 25 and the root 27 and the tip 28 are squared.
[0021]
While the pottery clay is being formed by the forming device, the outer peripheral surface 39 of the hill 38 of the pottery clay product 35 may be rounded due to abrasion of the forming member or the like. Further, even when the outer peripheral surface 39 of the hill 38 is formed in a predetermined shape at the time of molding, the glaze may accumulate at a root portion or the like of the outer peripheral surface 39 at the time of glazing. According to this embodiment, in any case, after the glaze is applied, the outer peripheral surface 39 of the hill 38 is shaved by the cutter 43 so that the root 41 and the tip 42 are squared into a desired shape.
[0022]
Second, the manufacturing cost of the bowl 10 is reduced. This is because the water repellent itself applied to the outer peripheral surface 39 of the hill 38 of the pottery clay product 35 and the step of applying the water repellent to the outer peripheral surface 39 are not required. The reason that the water-repellent treatment could be omitted is that the glaze applied to the outer peripheral surface 39 was shaved by the cutter 43. As described above, the outer peripheral surface 39 of the hill 38 of the pottery clay product 35 is shaved by the cutter 43, and the outer peripheral surface 26 of the hill 25 of the tea bowl 10 is squared, and the outer peripheral surface 39 of the hill 38 of the ceramic clay product 35 is glazed. The removal has helped both.
[0023]
As a comparative example, consider a bowl in which the outer peripheral surface of a porcelain product is first cut with a cutter, the outer peripheral surface is subjected to a water-repellent treatment, and then the porcelain product is glazed and fired. This bowl also requires a water-repellent treatment, which increases the manufacturing cost. In addition, glaze is buried by the subsequent glaze at the root and tip of the shaved outer peripheral surface, and the root and the like are likely to become round.
[0024]
【The invention's effect】
As described above, according to the present invention, it is possible to manufacture a high-quality teacup in which the outer peripheral surface of the hill is not glazed and the root portion and the tip portion are squared. In addition, the water repellent itself applied on the hill of the pottery clay product and the step of applying the water repellent are not required, and the manufacturing cost of the bowl is reduced.
[0025]
According to the pottery of claim 2, the outer peripheral surface of the hill of the pottery clay product can be easily and easily cut into a desired shape. According to the pottery of claim 3, a high-quality and cheap tea set can be obtained.
[Brief description of the drawings]
FIG. 1 is a front sectional view of a teacup according to an embodiment of the present invention.
FIG. 2 is a flowchart showing a manufacturing process of the bowl.
FIG. 3 is an explanatory view showing a process of shaving the bowl;
FIGS. 4A, 4B and 4C are perspective views showing another embodiment of the bowl;
FIG. 5 is a front sectional view showing a conventional teacup.
[Explanation of symbols]
10: Tea bowl 12: Body 14: Waist 15: Body 25: Height 26: Outer surface 27: Root 28: Tip 35: Ceramic clay product 36: Body 38: Height 39: Outer surface 41: Root 42: Tip 43 ： Cutter

Claims (4)

A molding process of molding a clay product having a main body and a hill from the clay,
A glaze process of applying glaze to the entire surface of the clay product,
Shaving the outer peripheral surface of the hill with a cutter, removing the glaze on the outer peripheral surface and squaring the outer peripheral surface,
A firing step of firing the pottery clay product in a kiln,
Pottery with a hill characterized by being manufactured by. 2. The pottery according to claim 1, wherein in the shaving step, one of the rotating members is covered with the porcelain clay product, and the other rotating member presses the depression of the hill, and the cutter is moved closer to the center of the hill to cut. 2. The pottery according to claim 1, further comprising a wiping step of wiping glaze on a back surface of the hill between the glaze step and the shaving step. The pottery according to claim 1, wherein the pottery is a tea bowl including a bowl and a cup.

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