| 摘要 |
PROBLEM TO BE SOLVED: To provide a film punching method for punching a film to be punched having a small initial tensile stress (at the time of 1%-elongation) so as to have pores of predetermined shapes continuously without distortion. SOLUTION: According to the film punching method, a laminated film is obtained by laminating a carrier film on the film to be punched via a water-easily-soluble adhesive layer, to reinforce the film so as to have a breaking stress of 80 N/15 mm width or more, a breaking elongation of 155% or less, and the initial tensile stress (at the time of 1%-elongation) of 8 N/15 mm width or more. Then the laminated film thus reinforced is punched, and thereafter the carrier film layer is separated and removed. Herein the separation and removal is preferably carried out by water submersion. COPYRIGHT: (C)2008,JPO&INPIT
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