| 摘要 |
PROBLEM TO BE SOLVED: To secure a range in which cracks are displaced vertically and to form a tile having a surface with large unevenness from an extrusion-molded basis. SOLUTION: In a process in which flow dividing plates in which wire rods 11, 11a... are formed in the front end part of a substrate to protrude forward are fitted to an extrusion mold set at the end of a soil kneading machine in an extrusion molding machine to be positioned in the middle part or upper and lower parts in the extrusion port of the extrusion mold, a raw material M, after being divided temporarily divided and combined, has small holes by means of the wire rods 11, 11a... to form a weak fragile layer X is formed in an extruded basis, and unevenness of large vertical displacement is formed on the surface of a tile to be processed by making cutters contact both sides of the fragile layer X.
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