| 摘要 |
PROBLEM TO BE SOLVED: To provide a cylindrical filter capable of preventing bubbling of a liquid to be filtered and increasing a filtering life, and to provide its production method. SOLUTION: The cylindrical filter (1) has a cylindrical body (10) in which a multi-layer spunbonded fabric (20) consisting a plurality of spunbonded fabrics is wound and adjacent spunbonded fabrics are thermal adhered each other, wherein in the cylindrical body (10), at least one of adjacent spunbonded fabrics consists of a composite resin containing the first thermoplastic resin and the second thermoplastic resin with 10°C higher melting point than the first thermoplastic resin, and in the multi-layer spunbonded fabric (20), a difference of each thermal shrinkage ratio in thermal adhesion temperature of adjacent spunbonded fabrics is 5% or above, and then fineness of strand, by which adjacent spunbonded fabrics are structured each other, is different. COPYRIGHT: (C)2006,JPO&NCIPI
|
