Printing material, method of manufacturing the printing material and stamp having the printing material

摘要

A printing surface (211), protruded portion (212), and joining portion (213) are obtained by forming polyolefin resin integrally. Next, a formed overall printing material is dipped in ink for several hours. After an ink saturating portion is saturated with ink sufficiently, the printing material is entirely placed in an incubator at 50 to 75°C and heated for 1 to 12 hours. As a consequence, the entire surface of the printing material is shrunken by about 0.5 to 5% so as to obtain a surface portion.