| 摘要 |
A hydraulically-formed nonwoven sheet is disclosed, which comprises:(a) first non-cellulosic polymeric fibers in an amount of from 5% to 90% by weight of the nonwoven sheet in its dry state, wherein the first non-cellulosic polymeric fibers have an average diameter less than 3.5 micron, an average cut length less than 3 millimeters, and an average aspect ratio of 400 to 2000; and (b) second non-cellulosic polymeric fibers in an amount of from 10% to 95% by weight of the nonwoven sheet in its dry state, wherein the second non-cellulosic polymeric fibers have an average diameter greater than 3.5 micron, an average aspect ratio of 400 to 1000 and, optionally, an average cut length of 5 millimeters; (c) third non-cellulosic polymeric fibers in an amount up to 50% by weight of the nonwoven sheet in its dry state, wherein the third non-cellulosic polymeric fibers have an average diameter greater than 10 microns and an average cut length greater than 5 millimeters; (d) cellulosic based materials in an amount up to 75% by weight of the nonwoven sheet in its dry state, wherein the cellulosic based materials comprise fibers manufactured from cellulose; naturally occurring cellulosic materials selected from hardwood fibers, softwood fibers, non-wood fibers or blends thereof; or blends of fibers manufactured from cellulose and naturally occurring cellulosic materials; and (e) binding material in an amount up to 40% by weight of the nonwoven sheet in its dry state; wherein the nonwoven sheet has a basis weight of from 15 grams/meter2 to 250 grams/meter2; an air permeability of at least 10 Coresta units; a slow rate penetration resistance of at least 25 Newtons; an average tensile strength of at least 6 kilograms/15 millimeters; and an average stretch of at least 7%. |
