| 摘要 |
<p>The purpose of the present invention is to provide a laminate porous film roll which is a laminate porous film comprising a covering layer partially laminated on at least one surface of a polyolephin resin porous film, wherein the laminate porous film roll comprises a boundary line formed linearly between the portion where the covering layer is laminated (the covering layer lamination portion) and the portion where the covering layer is not laminated (the no-covering layer portion), can be wound without wrinkles, has uniform quality, and has improved secondary workability for slits, etc.. This laminate porous film roll comprises a covering layer partially laminated on the at least one surface of the polyolephin resin porous film, and comprises at least one covering layer lamination portion X and at least one no-covering layer portion Y, wherein the film thickness Ta at the end portion of the at least one covering layer lamination portion X and the film thickness Tb in the center portion fulfill the relational expression Ta @ Tb, and the winding length of the film is 1000m or greater.</p> |
