| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a regenerated cellulose filament nonwoven fabric membrane with improved particle removability, and a method for producing the same; and to provide a nonwoven fabric and a method for producing the same, in particular, a nonwoven fabric membrane used in pore-diffusion and filtering methods and having a large treating capacity, and in which the particle removability exceeds that of a depth-type flat membrane. <P>SOLUTION: There is provided a regenerated cellulose filament nonwoven fabric having a flat-membrane shape, produced by a saponification method or a cuprammonium method of a cellulose derivative, which has a surface with high smoothness, and which has specified coarse-dense pulsation in the abundance of fibers in a cross sectional structure of the flat membrane. In the method for producing the regenerated cellulose nonwoven fabric with improved surface roughness, fiber density, laminate structure, and particle removability, a regenerated cellulose filament nonwoven fabric obtained by an ordinary production method is compressed at a degree of compaction of 40% or more in membrane thickness by a press machine while the nonwoven fabric is impregnated with water or an alkali metal hydroxide solution. <P>COPYRIGHT: (C)2013,JPO&INPIT |
