Nozzle member and process for producing the same

A method of manufacturing a nozzle member which has a plurality of through holes having a shape of a straight line parallel to a center axis, the method comprising:

• preparing a mixture by mixing raw material powder of ceramics, a binder for extrusion molding, and moisture;
• continuously passing two or more filaments in parallel and under tension through a back-tensioner comprising an elastic body or tension roller, a filament guide, and an orifice of an extrusion mold, the two or more filaments having a uniform diameter along overall length and formed of synthetic resin, carbon, or a metal;
• simultaneously with the continuous passing of the two or more filaments, continuously supplying the mixture with pressure into the orifice of the extrusion mold to obtain a continuous extrusion-molded body exiting from the orifice, the extrusion-molded body embedded with the two or more filaments in parallel;
• drying the continuous extrusion-molded body and cutting the dried continuous extrusion-molded body in a predetermined length to form a green body having the predetermined length;
• removing the two or more filaments from the green body to form two or more parallel and straight through-holes in the green body;
• and
• defatting and sintering the green body having the two or more parallel and straight through-holes.