Porous three-layer laminated sheet, method for producing the same, and separator for power storage device comprising three-layer laminated sheet

摘要

PROBLEM TO BE SOLVED: To provide a three-layer laminated sheet excellent in sheet strength, productivity, and air permeability, to provide a production method capable of commercially producing in a continuous manner, and to provide a separator for power storage element comprising the three-layer laminated sheet.SOLUTION: In a three-layer laminated sheet comprising: core material S of a nonwoven fabric mainly comprising thermoplastic fibers; and porous fiber layers P and Q of a layer above and a layer below the core material composed mainly of fine diameter cellulose fibers, the three-layer laminated sheet has an air permeability of 1000 sec/100 ml or less, as measured by the Gurley method, the three-layer laminated sheet has a weight in a range of 2 to 15 g/m, and the three-layer laminated sheet has a thickness in a range of 5 to 40 μm. The nonwoven fabric S contains, as constituent components, continuous filament selected from EVA, PE, PP, PET and the like.SELECTED DRAWING: Figure 1