KR20100130353A - Clay composition for body of earthen bowl - Google Patents

Abstract

PURPOSE: A body composition for an earthen pot is provided to satisfy various properties required as the body for the earthen pot by adding talc to mixed soil of Sancheong sand and ball clay. CONSTITUTION: A body composition for an earthen pot comprises Sancheong sand 40-53 weight%, ball clay 27-37 weight% and talcum 20-26 weight%. A method for manufacturing the earthen pot comprises the steps of: making a body by blending Sancheong sand 40-53 weight%, ball clay 27-37 weight% and talcum 20-26 weight%; molding the body; incinerating the molded product at 650-700°C; coating the calcined molded product with glaze; and sintering the molded product at 1,190-1,210°C.

Description

Possession composition for earthenware pot and manufacturing method of earthenware pot using the same {Clay composition for body of earthen bowl}

The present invention relates to a base for pottery, and more particularly, to a holding composition for casserole, which is a cooking vessel by direct fire, and a method for producing casserole using the same.

Onggi, such as earthenware and casserole, have long been in our people's lives for a long time, as well as our food culture, which consists of various fermented foods such as miso, soy sauce, red pepper paste, and kimchi. However, as the housing culture changed and lifestyle changed, many of these pots disappeared. Nevertheless, the earthenware pot is indigenous, and it does not crack even when heated rapidly at low temperature, and once the hot food does not cool easily. Unlike other pottery, it has been used steadily. In particular, with the spread of eco-friendly consumer culture, Onggi, which uses nature-friendly materials, is attracting attention again, and interest in traditional earthenware is growing.

Earthenware is a crock bowl used to boil or stew stew. It is heavy, crude, inferior in strength, and absorbent, compared to heat-resistant porcelain, which is fired at a higher temperature by using mixed ingredients. Because it is made of clay, small pores are formed on the surface of the bowl while it is baked at high temperatures in the kiln. In the present specification, "magnetic" is a sintered calcined body at a high temperature of 1,300 ~ 1,500 ℃ sintered generally using clay, quartz, feldspar-based mixed base material means that the glass is almost absorptive and translucent . Pottery is sintered at lower temperatures of 1,200 ~ 1,300 ℃, which means that the hardness and mechanical strength are lower than that of porcelain, and it is porous and absorbent. "Onggi" refers to earthenware and crockery, including poison, urn, earthenware pot, jar, etc. "Ceramic ware" refers to pottery and self together.

Clay refers to fine soil particles with a diameter of 0.004 mm or less. When the rocks are weathered and broken down, silicon, aluminum and water combine to form clays. Clays are classified into primary clays, which are residual clays, and secondary clays, which are sedimentary clays. The primary clay is less corroded and has a thicker particle, less plasticity and almost no impurities, resulting in white color. This includes high quality kaolin produced throughout Korea. Secondary clay, also known as plastic clay, refers to sedimentary clay, commonly called clay, and is a combination of minerals and organics that are fine particles, very plastic, and pale yellow or white. Secondary clays include, in addition to plastic clay produced domestically, ball clay, betonite, and Hong Kong clay imported from abroad.

Soybeans are used as raw clay as it is, or with a few additives, or in the form of blended materials containing various minerals in clay. In general, in the case of porcelain, various clays or various minerals are mixed and used according to purpose and use, while onggi is used by grinding raw clay as it is in the mined state. Raw clay is a bonded clay that is mined in the form of a mixture of secondary clays and minerals, not processed processed materials, and has a problem in that the characteristics of each mined site are different and the distribution of its properties and main components in the same mined land. There are physical limitations.

Sancheel soil is a mixed clay composed of silica, which is a mineral of low shrinkage, mixed with clay on the surface with high viscosity and plasticity. Sancheong clay mainly used for holding is sancheok clay divided into secondary clay and sancheong kaolin divided into primary clay. There is a problem of exhaustion. On the other hand, there are less weathered strata below the surface of Sancheong clay or Sancheong kaolin. Sansa is rarely used in the ceramic field because it is less weathered, which is why it is still rich in resources unlike sanchek clay or sancheok kaolin. In the present specification, "sancheolto" refers to both sanchek clay and sancheok kaolin, unless otherwise specified.

As a related prior art, Korean Patent No. 0350348 discloses a method of manufacturing clay for clay pots by mixing clays of natural state having different adhesive strength and moldability while varying colors depending on a collection area and a deposition height, respectively. . This method is meant to solve some of the problems of non-uniformity of existing natural mined clay, but it does not suggest the development of new materials or improvement of the properties of the materials.

The present invention relates to a base for earthenware whose main ingredient is acid blue clay instead of acid blue clay or acid blue kaolin which is depleted of resources. Particularly, the present invention uses volley as a main component together with acid blue sand and supplements the talc to supplement its properties. It relates to a base for casserole used.

It has been thought that acid sands are not suitable as a base material for ceramics. However, the present inventors use a mixture of volley clay in a predetermined ratio to acid sands, and when a large amount of talc is added thereto, the present invention satisfies various properties required for the earthenware pot. It was confirmed that an excellent base material composition can be obtained and the present invention was completed.

It is an object of the present invention to use acid blue sand as a main material of 40% by weight or more, preferably 45% by weight instead of acid blue clay or acid blue clay, which is depleted of resources, and by using a ball clay about 32% by weight. In order to provide a holding composition for earthenware pot, it is possible to use plastic clay mixed with clay clay and volley clay as the main material and add talc to it to have the same feeling as a traditional earthenware pot made from plastic raw clay. An object of the present invention is to provide a holding composition for casserole and a casserole using the same, which have good shrinkage and low fire resistance.

Other objects and advantages of the present invention will be described below and will be better understood by practice of the present invention.

In the present invention to achieve the above object,

Acid blue sand 40-53 wt%; 27 to 37% by weight of clay; And 20 to 26% by weight talc is provided with a holding composition for the earthenware.

Unlike acid blue clay or acid blue kaolin, which is used as a good raw material, acid blue sand is a less weathered sand-based soil, which has not been used as a ceramic material since it is not suitable as a raw material. However, by using a mixture of acid clay and ball clay, which is known to have excellent adhesion, in the same ratio as above, it is possible to obtain better quality than that of acid blue clay while using acid blue sand as the main material of about 45%. . Acid scotch is preferably included in the composition of the present invention at 45 ± 5% by weight.

Volclays are clays that have strong plasticity and are organic materials and have good adhesion. Ball clay is widely known in the UK, the embodiment of the present invention used a ball clay produced in Jilin, China. Volcleles having similar properties can be used in the present invention regardless of the place of origin. In the present invention, it is possible to obtain a good quality qualitatively, while reducing the amount of clay used as a main material and the amount of clay compared to the general earthen pot, which is because the ball clay used as a clay component has a higher adhesion than the acid clay I think. In addition, the use of fine-grained ball clay makes the surface of the finished casserole clearer, smaller microcracks, and better heat resistance compared to other casseroles using sanchek clay. Volclays are preferably included in the composition of the present invention at 32 ± 5% by weight.

Talc is a rock belonging to the monoclinic system with a mica-like crystal structure, and is mostly an aggregate of dense material and is used for insulation refractory materials. Talc is generally used at less than 5% by weight in the field of heat-resistant magnetic, such as for strength reduction, much more than about 20-26% in the present composition. Originally, talc has a problem of lowering the strength of the product due to a lower firing temperature when used in a large amount. In the present invention composition using a mixture of acid blue sand and ball clay in the above ratio, the talc is in such a range. Even if it is used, there is no problem that the strength is particularly reduced compared to the traditional casserole. This is thought to be due to the fact that the traditional earthenware itself is lower in strength than the porcelain and in the present invention, a mixed soil containing a mixture of acid sand having a large amount of sand and ball clay having good heat resistance is used as the main material. As described above, since the disadvantages of the addition of talc do not appear, the talc may be used in a large amount of 20% or more as described above, and thus, various advantages of the talc itself may be reflected in the composition. That is, since talc is a mineral of good fire resistance, it is possible to further increase the fire resistance of the body, and improve plasticity. In addition, since talc is a mineral having a low coefficient of thermal expansion of about 10 ^-6, it is possible to reduce the shrinkage of the body to prevent deformation or breakage during the firing process and to solve the problem of microcracks on the surface of the casserole. In addition, the sintered state is also improved by the use of talc, so that the surface of the molded article is smoothed and the aesthetics are improved, and the absorbency of the pot is also reduced.

In the present specification, "tugbaegi" is not limited to the bowl used to boil or stew stew, but includes all refractory pottery used for direct fire (indirect fire) regardless of shape, in particular to include a grill plate Can be.

In the present invention,

(a) blending 40 to 53% by weight of acid sand, 27 to 37% by weight of clay, and 20 to 26% by weight of talc to make a base material;

(b) molding the body obtained in (a);

(c) calcining the molded article obtained in (b) at 650 to 700 ° C;

(d) applying a glaze to the calcined molded article of (c);

(e) calcining the molded article coated with the glaze of (d) at 1,190 ~ 1,210 ℃; is provided a method for producing a casserole comprising a.

 In the present invention, while using the acid blue sand as a main material of about 45% by adding a ball clay and talc to it, it is possible to provide a holding composition for the earthenware pot with good plasticity, small shrinkage rate and excellent fire resistance. Possession composition of the present invention is less weathering can be used to produce a higher quality earthenware while using the acid cleaning material not used conventionally as the main material.

Hereinafter, with reference to the accompanying drawings will be described a preferred embodiment of the earthenware manufacturing method according to the present invention. 1 is a manufacturing process of the earthen pot according to a preferred embodiment of the present invention.

First, the mixture is made of 40 ~ 53% by weight of acidic sand and 27 ~ 37% by weight of clay and 20 to 26% by weight of talc (S10). As the ball clay, China's Jilin Mountain Ball Clay was used. Table 1 below shows the results of the component analysis of acid blue sand and ball clay used as raw materials, and Table 2 shows the results of component analysis of the used talc. The mass in the raw material is pulverized appropriately beforehand and then weighed. The blended ingredients are mixed evenly and ground in a ball mill to a certain particle size. When the grinding is completed, it is moisturized and stirred to make the body. The body is kneaded several times so that the air contained in it is completely drained and rolled in a cylindrical shape when the humidity and concentration are appropriate as a whole.

Thus prepared is molded (S20). As a molding method, there are generally methods such as plastic molding, double injection molding, compression molding, and extrusion molding. In the case of a simple casserole, double plastic molding is preferable. In addition, in the case of earthenware, it is appropriate to make the primary decoration performed immediately after molding. After molding and decoration is completed, slowly dry in a closed indoor drying room. Slow drying in a well-ventilated place will dry uniformly, without warping or cracking. In the case of mass production, a working tunnel type drying room is recommended.

Subsequently, the molded article is calcined at 650 to 700 ° C. (S30). In general, molded products that are not prebaked are weak in mechanical strength, and if glazed and immediately fired in this state, partial cracking is likely to occur. Shuttle kilns may be used for small quantities, but tunnel kilns are recommended for mass production and quality stability.

Then glaze is applied to the calcined molded article (S40). Glaze is a surface coating that enhances aesthetics and facilitates cleaning after contamination. Although it is possible to use all known types of glazes, it is preferable to use natural glazes based on fallen leaves and soil to take advantage of traditional earthenware pots.

Natural glaze mainly utilizes defensive method of decomposing natural clay for glaze in water and dewatering when sand is precipitated to obtain fine particle clay, or removing water and grinding it by filter press by pulverizing raw materials in ball mill. do. After burning the deciduous leaves to make a lye, the clay is mixed with a certain ratio and produced by heating. Natural glaze, which is mainly composed of fallen leaves and soil, gives pollution-free gloss without lead and cadmium, so it is suitable for food cooking and storage. It is also possible to add or increase far-infrared radiation efficacy by adding well-known functional materials, such as elvan, germanium, to glaze. As the glaze is applied, the earthenware becomes harder as it goes through the first roasting and the chaebol, and the absorbency is lowered. In consideration of these characteristics, the glaze is applied to an appropriate thickness, and the coating operation is in accordance with a conventional known method.

Finally, the molded article coated with glaze is fired at 1,190 to 1,210 ° C. (S50). The temperature is raised over about 4 hours, and the temperature is adjusted to around 1200 ° C. for 30 minutes with the temperature controlled, and then cooled again for about 4 hours. Although the secondary firing temperature is 1,220 ° C. or more in the conventional manufacturing process of the earthenware pot, in the present invention, the firing temperature is lowered by about 20 ° C. by using a composition having a large amount of talc added thereto. However, as described above, since the molded product having a better sintered state is obtained by adding talc while maintaining the strength similar to that of the conventional earthenware, the firing temperature is rather a positive factor to increase the process efficiency. At this time, to increase the glossiness of the molded article, it is quenched at a rate of 200 ° C. per hour from the highest firing temperature to about 600 ° C.

 1 is a manufacturing process of the earthen pot according to a preferred embodiment of the present invention.

Claims (3)

Acid blue sand 40-53 wt%; 27 to 37% by weight of clay; And 20 to 26 wt% of talc. (a) blending 40 to 53% by weight of acid sand, 27 to 37% by weight of clay, and 20 to 26% by weight of talc to make a base material; (b) molding the body obtained in (a); (c) calcining the molded article obtained in (b) at 650 to 700 ° C; (d) applying a glaze to the calcined molded article of (c); (e) firing the molded article coated with the glaze of (d) at 1,190 ~ 1,210 ℃; manufacturing method of casserole. The method of claim 1, wherein the glaze is a natural glaze mainly composed of leaves and soil.

Images