| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a manufacturing method of a high-productivity cellulose acylate film which is almost free from a polarizing foreign substance and the generation of color change such as yellowing or die line. <P>SOLUTION: A metallic nonwoven fabric filter has a plurality of filter layers, and the filter layer located on the farthest downstream side of this filter layer train is formed of a metallic fiber with 2 to 6 μm average dia., while the filter layer located upstream from the farthest downstream side filter layer is formed of a metallic fiber with 4 to 12 μm average dia. <P>COPYRIGHT: (C)2009,JPO&INPIT |
