| 摘要 |
PROBLEM TO BE SOLVED: To provide a perforated film having through-holes with a predetermined hole size present therein in arbitrary density. SOLUTION: In the perforated film wherein fine through-holes are formed to a thermoplastic synthetic resin film at a predetermined pitch, the ratio of the average hole size/average pitch of the fine through-holes is 0.15-0.85 and the thickness of the film is 1-25μm. A large number of fine recessed parts are formed to the thermoplastic synthetic resin film by emboss processing using an embossing body having a large number of fine protrusions and heat treatment is applied to the thermoplastic synthetic resin film, which is subjected to emboss processing, at a temperature lower than the melting temperature of the thermoplastic synthetic resin film but higher than the glass transition temperature thereof to form the through-holes to the recessed parts. By this method, the thermoplastic synthetic resin film with a thickness of 1-25μm having the fine through-holes substantially regularly arranged thereto is obtained. COPYRIGHT: (C)2007,JPO&INPIT |
