Wet repair is suitable for more complex shape or the need for wet connection of the blank, this time the operation is easier and repair blank knife is not easy to wear, the disadvantage is that it is easy to move and operate in the process of making the blank injury caused by deformation, to improve the quality of the unfavourable. General bowls, pots, cups and other products that need to be processed, more wet repair, depending on the degree of moisture to be processed. Need to plastic processing and bonding of the blank, its wet repair moisture can be slightly higher. Wet repair can be used to scrape the scraper, foam moulding pieces and so on to scrape and repair the light.
(1) Pulling: one of the traditional ceramic production methods, with the help of the pulling machine to make a circle as the centre of the billet.
(2)Clay plate moulding: the main production method of traditional inlaid ware, which can make polygonal, square, flat and so on.
(3)Clay strip moulding: the production of large pieces of brown ware, a common method of modern ceramics
(4) Freehand kneading: directly using both hands to form and bond the clay balls.
(5) Moulding: Making moulds and pouring clay into moulds.
Ceramic clay and potter's clay is mainly composed of kaolinite, montmorillonite, quartz, feldspar composed of silty clay. The main chemical composition, silicon dioxide, aluminium dioxide, to a small amount of iron oxide, calcium oxide, magnesium oxide and so on. The composition of china clay is mainly kaolin, feldspar, quartzite and mullite components, pure china clay is a white or grey-white soft minerals with a silky luster, china clay is metamorphosed from mica feldspar, which sodium, potassium, calcium, iron and other losses plus the water changes from this role is called china clay or kaolin.
The temperature is divided into high, medium and low temperature. The original colour is divided into white porcelain, black pottery, red pottery.
Porcelain is divided into high white porcelain clay, flower clay porcelain clay, translucent porcelain clay, clay, bone china, alabaster clay, dolomite clay, sandy clay and so on.
Water absorption is the amount of water adsorbed by the pores in a ceramic product as a percentage of the product.
We commonly see a variety of polished tiles, unglazed brocade tiles, most sanitary ware is porcelain, water absorption rate E ≤ 0.5%; antique tiles, small floor tiles (floor climbing wall), crystal tiles, wear-resistant tiles, matte tiles, etc. is stoneware tiles, that is, half tiles, water absorption rate of 0.5%10%.
Ceramics is a hard substance formed after a series of physicochemical reactions of clay raw materials, barren raw materials and fusible raw materials through appropriate proportioning, crushing, moulding and baking at high temperatures.
Pottery and porcelain can be distinguished from each other by several aspects such as firing temperature, clay, texture, sound, transparency and water absorption.
Generally speaking, the firing temperature of pottery is between 600-800 degrees Celsius, while the firing temperature of porcelain is above 1200 degrees Celsius.
Pottery is mostly made of common clay, while porcelain is mostly made of kaolin.
The body of pottery is loose, while the body of porcelain is hard and dense.
The sound of pottery is mostly muffled, while the production of porcelain is mostly clear and bright.
Most of the body of the pottery is opaque, while the body of the porcelain is translucent.
Pottery has a high water absorption rate, while porcelain is almost non-absorbent.
Hardware pottery is hard and heavy, with a very rough surface, mostly unglazed, making it the most economical and practical vessel for food storage.
Primitive celadon is more delicate, with a smooth and transparent glaze on the surface, and was mostly used for food storage.
Celadon, is one of the most important varieties of porcelain in ancient China. The so-called celadon, is not purely green-coloured porcelain, generally more green in the yellow, green in the green, and even green in the grey and so on.
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