| 摘要 |
A percolation sheet 1 is constituted of a laminated sheet comprising a long-fiber nonwoven fabric 2 with a basis weight of 5 to 30 g/m<2>, at least a portion of which is formed from synthetic fibers of a high-melting-point resin, and a short-fiber nonwoven fabric 3 with a weight of 3 to 15 g/m<2>, at least a portion of which is formed from synthetic fibers of a low-melting-point resin. The short-fiber nonwoven fabric 3 is formed from a nonwoven fabric in which fibers with a fiber length of 3 to 15 mm are randomly dispersed and deposited using a dry process, and these fibers are thermally bonded to each other. In a diagram illustrating the relationship between the pore size of the voids in the percolation sheet and the distribution rate thereof, the distribution rate of the maximum peak is ten times or more of the distribution rate of the other peaks. <IMAGE> |
