| 摘要 |
PROBLEM TO BE SOLVED: To obtain a cylindrical seamless needled felt comprising inorganic fibers and/or organic fibers, large in a specific surface area, high in porosity, little in pressure loss, excellent in handleability, cleanability and durability, and useful for Rasching ring for adsorbing gas and for adsorbing and filtering contaminants in liquids, etc. SOLUTION: This cylindrical seamless needled felt comprises inorganic fibers and/or organic fibers such as viscose rayon fibers or polyester fibers (thickness is preferably 5-50μm). A single layer or multilayer structure cartridge filter is preferably formed from the cylindrical seamless needled felt.
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