| 摘要 |
PROBLEM TO BE SOLVED: To provide a filter which prevents the generation of scratches while keeping surface catching and washing properties and is highly durable against repetitive pressures by washing. SOLUTION: The filter comprises: a filter body 3 which is the material of a large diameter and provided with pores of a large diameter; a microfiltration membrane 5 provided on the outer side or inner side of the filter body 3, which is the material of a diameter smaller than the filter body 3 and provided with micropores finer than the filter body 3; and a protective film 7 provided on the outer side or inner side of the microfiltration membrane 5, which is the material of the diameter larger than the microfiltration membrane 5 and provided with the pores of the diameter larger than the microfiltration membrane 5 and is the material of the diameter equal to or smaller than the filter body 3 and provided with pores finer than the filter body 3. The respective layers of the filter body 3, the microfiltration membrane 5 and the protective film 7 are joined with each other by the joining technique of bonding or heat fusion or the like. COPYRIGHT: (C)2009,JPO&INPIT
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