| 摘要 |
PROBLEM TO BE SOLVED: To provide a long-life electret lamination filter having a rigidity and an easy pleat, and a small clog at a dust loading time.SOLUTION: An electret lamination filter is made of a laminate nonwoven fabric, in which a reinforcement layer made of a polyester fiber thermal bond nonwoven fabric and a frictional electrification nonwoven fabric layer composed of polyolefin fibers and polyester fibers are jointed at a projection junction. The area of the projection junction is 1.8 to 13% of the entire surface area of the laminate nonwoven fabric, and the distance between the projection junctions is 3 to 10 mm.SELECTED DRAWING: None |
