| 摘要 |
PROBLEM TO BE SOLVED: To accurately form a seal surface on a front surface of a printing element with a character, a graphic form or the like provided on an original sheet and to obtain a clear seal print as an original. SOLUTION: A method for forming the seal surface of a thermoplastic resin comprises the steps of superposing a transparent original sheet partitioned and formed at a part formed with a character of a graphic form to be the seal surface, and a part not formed therewith according to large and small infrared transmission degrees on an open-cell foam thermoplastic porous sealing material mixed with a heating material fine power for heating by an infrared ray; irradiating the ray from a front side of the original sheet; forming a non-porous protective film impossible to bleed an ink melt and solidified by heating the powder mixed in the front layer of the part heated by transmitting the ray of the front surface of the porous sealing material; and forming a residual front surface of the porous sealing material corresponding to a part having a small infrared transmission degree of the original sheet as an ink bleeding surface. The method further comprises the steps of forming the transparent film in a double structure of front and rear layers, providing a cooling layer therein, and forming an ink bleeding part and a non-ink bleeding part at the thermoplastic resin.
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