CYLINDRICAL FILTER AND METHOD OF MANUFACTURING THE FILTER

摘要

A cylindrical filter low in water passing resistance and long in filtration life, characterized in that nonwoven cloth is wound around laminatedly in circumferential direction, and the nonwoven cloth of at least one layer is melt-blow nonwoven cloth formed of melt-blow fibers having an average orientation angle of 30 DEG or less relative to the circumferential direction of the cylindrical filter.