WET PROCESS NONWOVEN FABRIC AND PROCESS FOR PRODUCING THE SAME

摘要

A wet-process nonwoven fabric constituted of inorganic fibers including bundled inorganic fibers and a binder ingredient with which the fibers are bonded, wherein the average number of fibers per bundle is 1.5 to 20 and the nonwoven fabric has a section in which the average value of Z/X which is represented by (the number of fibers in each bundle which are disposed adjacently in the thickness direction)/(the number of fibers in each bundle which are disposed adjacently in the plane direction) (average Z/X value) is 0.9 or lower; and a wet process for producing a nonwoven fabric which comprises: a step in which inorganic fibers are dispersed in an aqueous medium in the presence of an anionic dispersion stabilizer; a step in which a cationic compound is added to the resultant fiber dispersion to bundle fibers to produce a fiber dispersion containing fiber bundles; a step in which the resultant fiber dispersion containing fiber bundles is formed into a sheet by a wet papermaking method; and a step in which a binder is applied to the sheet obtained. This nonwoven fabric is a nonwoven inorganic-fiber fabric having a high density.