POLYOLEFIN MICROPOROUS FILM WOUND BODY

摘要

PROBLEM TO BE SOLVED: To provide an elongated polyolefin microporous film wound body by which the winding can be performed smoothly by preventing a winder from being suddenly stopped in a battery assembly process, and which is suitable for transportation to a high-temperature region.SOLUTION: A polyolefin microporous film wound body comprises: a polyolefin microporous film; and a terminal end detection tape attached to the polyolefin microporous film near an end of the film on the side where the film winding is started. The wound body has a winding length of 1500 m or larger. The terminal end detection tape includes: an adhesive layer made of an adhesive; and a base material. The adhesive layer is 5-30 μm in thickness on one entire surface of the base material, which is provided within a range of 10-40% to 100% of the total thickness of the terminal end detection tape.SELECTED DRAWING: Figure 2