Tubular Filter and its Manufacturing Method

Abstract

This invention relates to a cylindrical filter. The cylindrical filter 1 of this invention includes a filter layer 4 formed of a cylindrical fiber aggregate. The filter layer 4 includes a cylindrical fiber aggregate A (4a) formed by winding a first fiber sheet 41a in a cylindrical shape a plurality of times. The first fiber sheet 41a has a width of 15 mm or more and 75 mm or less. The first fiber sheet 41a is wound in a spiral shape and has an overlapping portion in the long side direction of the cylindrical filter. The overlap rate between the continuously wound first fiber sheets, expressed as the ratio of the width of the overlapping portion to the width of the first fiber sheet, is 80% or more and 99% or less. This provides a cylindrical filter with basic filtration performance while improving filtration life or filtration accuracy, and a method for manufacturing the same. none

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