ROLLED BODY OF BATTERY PACKAGING MATERIAL

摘要

The present invention relates to the rolled body of a battery packaging material consisting of a laminated film in which at least a coating layer, a base material layer, a metal layer, and a sealant layer are laminated in this order. The coating layer is formed of a two-liquid curing type resin. The sealant layer is formed of a melt-extruded thermoplastic resin and contains foreign particles or unmelted particles of the thermoplastic resin. A mark is placed on the laminated film so that the position of a protrusion on the surface of the sealant layer can be recognized, said protrusion being attributable to the foreign particles or the unmelted particles and having an area exceeding 0.4 mm2 when viewed from the laminated direction of the laminated film. The rolled body is rolled so that the surface of the sealant layer and the surface of the coating layer contact each other. This makes it possible to appropriately control defects in the coating layer.