Patent ID: 7255320

Claim:
A mold for a plastic filter, comprising: at least a pair of mold sections defining a cylindrical cavity in an assembled state, a core fittable in the cylindrical cavity for molding the filter between an outer circumference of the core and inner circumference of the cavity, the mold sections being freely attachable/detachable in a direction away from a center line of the cylindrical cavity, the mold sections each being a stacked body formed by stacking a number of thin plates that have inner circumferences defining each of horizontal cross-sections of the inner circumference of the cavity, alternating ones of the inner circumferences projecting further radially inward than interposed alternating other ones of the inner circumferences to form horizontal ridges defining horizontal grooves therebetween, inner end surfaces of the horizontal ridges being in contact with the outer circumference of the core, and wherein air existing between the core and the cavity is externally released through gaps between the stacked thin plates during resin injection.