| 摘要 |
PROBLEM TO BE SOLVED: To provide a manufacturing method of cellulose acylate which can reduce an initial filtration pressure, hardly produces polarizing foreign matter, does not cause a color change such as yellowing and a die line and has high productivity. SOLUTION: Average diameter of metal fibers in a filtration layer of a metal nonwoven fabric filter is 2 to 12μm, METSUKE (unit) weight thereof is 800 to 3,000 g/m<SP>2</SP>, thickness thereof is 500 to 2,000μm and time required for causing molten material of thermoplastic resin to flow through the thickness of the metal nonwoven fabric filter is 30 to 450 sec. COPYRIGHT: (C)2009,JPO&INPIT
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