| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for improving production efficiency by shortening the time when making zigzag folds and manufacturing a pleated filter without performing endless processing by a completely new method unlike before.SOLUTION: By inserting a filter medium formed into a cylindrical shape between a core die 3 having a plurality of projected line bodies 3p on an outer side face and an outer die 4 having a plurality of rollers 5 arranged in series on an inner side face, a pleated filter is manufactured. A tapered part is provided on both of the outer side of the core die 3 and the inner side of the outer die 4, and the core die 3 includes a heater 6 for heating the filter medium. |
