| 摘要 |
PURPOSE:To prevent the strain and fluffing at the time of producing the titled element by crushing the outer peripheral edge part over the specified radial width while heating prior to the introduction of the conical outer peripheral edge part of a formed body into the cavity of the lower die. CONSTITUTION:After a strip filter medium is removed from a mold to from a sectional blank, plural concentric arcuate pleats are formed on the blank by a heated push blade, and the outer peripheral edge and inner peripheral edge of the blank are crushed over the specified width. The blank is then bent along the pleats to form a concentric arcuate wall, and the blank is rolled into a ring to obtain the concentrically arranged annular filter medium formed body 26. Then after the conical outer peripheral edge part of the formed body 26 is introduced into the vertical section 38 of the cavity 32 of the T die 30 of an injection molding machine, the upper die 40 is closed, molten resin is injected into cavities 32 and 34, and the outer peripheral edge part is partially insert-molded in a plastic flange 44 and the outer cylinder 46. |
