| 摘要 |
<p>The present invention relates to a method for manufacturing a fine-porous film by a dry process, which includes the steps of: obliquely drawing a fine-porous film with the elongation axis being oblique to the longitudinal direction of the film so as to prepare a film through a high temperature elongation process; and laminating two or more of the high-temperature obliquely drawn films with the elongation axis of one layer crossing that of the adjacent layer (almost perpendicularly) so as to ensure that the longitudinal physical properties of the film are uniform with the transverse physical properties, and applying the fine-porous film as a separation membrane for a secondary battery.</p> |
