PLEATING METHOD OF FILTER FILTERING MATERIAL AND PLEATING APPARATUS

摘要

PROBLEM TO BE SOLVED: To provide a pleating method of a filter filtering material, which can prevent formation of pinholes due to electric discharge.SOLUTION: A pleating method of filter filtering material comprises blowing ionized air toward end faces of filter filtering material 10 and a pair of blades 5 from lateral sides of the filter filtering material 10 by using static electricity removing devices 30 when pleating the filter filtering material 10 by pressing the pair of the blades 5 toward the filter filtering material 10 from both sides in a thickness direction of the filter filtering material 10. The filter filtering material 10 preferably contains a polytetrafluoroethylene porous film and air-permeable support material.SELECTED DRAWING: Figure 2