Fine feldspathic earthenware and process of manufacturing the same

Abstract

A fine feldspathic earthenware including a body and a glaze layer covering surfaces of the body. The body has water absorption percentage of not lower than 3 % and lower than 15 % and includes an annular bottom formed on a bottom portion of the body. The glaze layer is absent on a surface of the annular bottom, and the surface of the annular bottom is covered with an annular vitrified layer which has substantially no water absorbing property. The vitrified layer is formed by coating the surface of the annular bottom with a composition having lower refractoriness than the body, and biscuit-firing the composition together with the body.

1 . A process of manufacturing a fine feldspathic earthenware comprising a body and a glaze layer covering surfaces of said body, said body having water absorption percentage of not lower than 3% and lower than 15% and including an annular bottom formed on a bottom portion of the body, said process comprising: 
 a forming step of forming a precursor of said body such that said precursor of said body has a precursor of said annular bottom;    a coating step of coating a surface of said precursor of said annular bottom with a composition having a lower degree of refractoriness than that of said precursor of said body; and    a biscuit-firing step of biscuit-firing said precursor of said body with said composition covering said surface of said precursor of said annular bottom, whereby said body is formed with said annular bottom the surface of which is covered with an annular vitrified layer which is formed of said composition and which has substantially no water absorbing property.    
     
     
         2 . The process according to  claim 1 , further comprising a step of positioning a plurality of pieces of said precursor of said body in a stack such that adjacent ones of said pieces are spaced apart from each other by a refractory setter, and wherein said pieces positioned in the stack are biscuit-fired in said biscuit-firing step.