And a method of manufacturing the hard pottery

摘要

PROBLEM TO BE SOLVED: To provide an ironstone china the body of which having a water absorption level of easily invaded with filthy water and microparticles is not exposed to its surface and a suitable process for manufacturing it.;SOLUTION: In an application process P7, a material forming a porcelain layer having a lower refractoriness than that of the basis material body 42 is coated on a part corresponding to the base 44 of a formed body 52 formed from a raw material to have a required shape. In a biscuit firing process P8, the formed body 52 is biscuit fired, where a porcelain layer 48 substantially having no water absorption is formed at the surface of the base 44. Therefore, a glaze layer 46 is unnecessary to be overlaid on the surface of the porcelain layer 48. In the glazing process P13, the base 44 does not adhere to a refractory setter 62 in case the formed body is directly put on the setter 62. A part which becomes the glaze layer 46 is unnecessary to be supported by a certain holder and an unglazed part caused by the holder is not formed.;COPYRIGHT: (C)2004,JPO