PERFORATED FILM, COATING FILM, AND ELECTRICITY STORAGE DEVICE

摘要

Tensile strength in a width direction and a longitudinal direction is improved without damaging a ventilation characteristic. A perforated film is a perforated film provided with holes, each of the holes is arranged at an intersection of a plurality of virtual lines extending along a direction and a plurality of virtual lines extending along a direction, and the direction is different from the width direction and the longitudinal direction. The direction and the direction may be both inclined at an angle larger than 30° and smaller than 60° to the width direction.

主权项

1. A perforated film provided with holes,
wherein each of the holes is disposed on an intersection of a first cut provided on a first virtual line extending along a first direction and a second cut provided on a second virtual line extending along a second direction, and wherein the first direction is different from a width direction and a direction orthogonal to the width direction.