POROUS FILM WOUND MATERIAL

摘要

PROBLEM TO BE SOLVED: To provide a porous film wound material having satisfactory feedability.SOLUTION: Provided is a porous film wound material having a wound porous film in which the standard deviation of the thickness in the width direction is 0.5 μm or higher. A difference between the maximum value and the minimum value of the outer diameter of the porous film wound material is 0.5 mm or lower. The porous film wound material can satisfactorily exert feedability because it is composed as shown in the above. Further the porous film can be suitably used as a cell separator.SELECTED DRAWING: None